OPTICAL IMAGE CAPTURING SYSTEM
A six-piece optical lens for capturing image and a six-piece optical module for capturing image are provided. In order from an object side to an image side, the optical lens along the optical axis includes a first lens with refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with refractive power and a sixth lens with refractive power. At least one of the image-side surface and object-side surface of each of the six lens elements is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.
This application claims the benefit of Taiwan Patent Application No. 104128205, filed on Aug. 27, 2015, in the Taiwan Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present disclosure relates to an optical image capturing system and more particularly to a compact optical image capturing system which can be applied to electronic products.
2. Description of the Related Art
In recent years, with the rise of portable electronic devices having camera functionalities, the demand for an optical image capturing system is raised gradually. The image sensing device of ordinary photographing camera is commonly selected from charge coupled device (CCD) or complementary metal-oxide semiconductor sensor (CMOS Sensor). In addition, as advanced semiconductor manufacturing technology enables the minimization of pixel size of the image sensing device, the development of the optical image capturing system directs towards the field of high pixels. Therefore, the requirement for high imaging quality is rapidly raised.
The traditional optical image capturing system of a portable electronic device comes with different designs, including a four-lens or a five-lens design. However, the requirement for the higher pixels and the requirement for a large aperture of an end user, like functionalities of micro filming and night view, or the requirement of wide view angle of the portable electronic device have been raised. But the optical image capturing system with the large aperture design often produces more aberration resulting in the deterioration of quality in peripherical image formation and difficulties of manufacturing, and the optical image capturing system with wide view angle design increases distortion rate in image formation, thus the optical image capturing system in prior arts cannot meet the requirement of the higher order camera lens module.
Therefore, how to effectively increase quantity of incoming light and view angle of the optical lenses, not only further improves total pixels and imaging quality for the image formation, but also considers the equity design of the miniaturized optical lenses, becomes a quite important issue.
SUMMARY OF THE INVENTIONThe aspect of embodiment of the present disclosure directs to an optical image capturing system and an optical image capturing lens which use combination of refractive powers, convex and concave surfaces of six-piece optical lenses (the convex or concave surface in the disclosure denotes the geometrical shape of an image-side surface or an object-side surface of each lens on an optical axis) to increase the quantity of incoming light of the optical image capturing system and the view angle of the optical lenses, and to improve total pixels and imaging quality for image formation, so as to be applied to minimized electronic products.
The term and its definition to the lens element parameter in the embodiment of the present invention are shown as below for further reference.
The lens element parameter related to a length or a height in the lens element
A maximum height for image formation of the optical image capturing system is denoted by HOI. A height of the optical image capturing system is denoted by HOS. A distance from the object-side surface of the first lens element to the image-side surface of the sixth lens element is denoted by InTL. A distance from an aperture stop (aperture) to an image plane is denoted by InS. A distance from the first lens element to the second lens element is denoted by In12 (instance). A central thickness of the first lens element of the optical image capturing system on the optical axis is denoted by TP1 (instance).
The lens element parameter related to a material in the lens element
An Abbe number of the first lens element in the optical image capturing system is denoted by NA1 (instance). A refractive index of the first lens element is denoted by Nd1 (instance).
The lens element parameter related to a view angle in the lens element
A view angle is denoted by AF. Half of the view angle is denoted by HAF. A major light angle is denoted by MRA.
The lens element parameter related to exit/entrance pupil in the lens element
An entrance pupil diameter of the optical image capturing system is denoted by HEP. A maximum effective half diameter (EHD) of any surface of a single lens element refers to a perpendicular height between an intersection point on the surface of the lens element where the incident light with the maximum view angle in the optical system passes through the outmost edge of the entrance pupil and the optical axis. For example, the maximum effective half diameter of the object-side surface of the first lens element is denoted by EHD 11. The maximum effective half diameter of the image-side surface of the first lens element is denoted by EHD 12. The maximum effective half diameter of the object-side surface of the second lens element is denoted by EHD 21. The maximum effective half diameter of the image-side surface of the second lens element is denoted by EHD 22. The maximum effective half diameters of any surfaces of other lens elements in the optical image capturing system are denoted in the similar way.
The lens element parameter related to a depth of the lens element shape
A distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the object-side surface of the sixth lens element, is denoted by InRS61 (instance). A distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the image-side surface of the sixth lens element is denoted by InRS62 (instance).
The lens element parameter related to the lens element shape
A critical point C is a tangent point on a surface of a specific lens element, and the tangent point is tangent to a plane perpendicular to the optical axis and the tangent point cannot be a crossover point on the optical axis. To follow the past, a distance perpendicular to the optical axis between a critical point C51 on the object-side surface of the fifth lens element and the optical axis is HVT51 (instance). A distance perpendicular to the optical axis between a critical point C52 on the image-side surface of the fifth lens element and the optical axis is HVT52 (instance). A distance perpendicular to the optical axis between a critical point C61 on the object-side surface of the sixth lens element and the optical axis is HVT61 (instance). A distance perpendicular to the optical axis between a critical point C62 on the image-side surface of the sixth lens element and the optical axis is HVT62 (instance). Distances perpendicular to the optical axis between critical points on the object-side surfaces or the image-side surfaces of other lens elements and the optical axis are denoted in the similar way described above.
The object-side surface of the sixth lens element has one inflection point IF611 which is nearest to the optical axis, and the sinkage value of the inflection point IF611 is denoted by SGI611 (instance). SGI611 is a horizontal shift distance in parallel with the optical axis from an axial point on the object-side surface of the sixth lens element to the inflection point which is nearest to the optical axis on the object-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF611 and the optical axis is HIF611 (instance). The image-side surface of the sixth lens element has one inflection point IF621 which is nearest to the optical axis and the sinkage value of the inflection point IF621 is denoted by SGI621 (instance). SGI621 is a horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the inflection point which is nearest to the optical axis on the image-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF621 and the optical axis is HIF621 (instance).
The object-side surface of the sixth lens element has one inflection point IF612 which is the second nearest to the optical axis and the sinkage value of the inflection point IF612 is denoted by SGI612 (instance). SGI612 is a horizontal shift distance in parallel with the optical axis from an axial point an the object-side surface of the sixth lens element to the inflection point which is the second nearest to the optical axis on the object-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF612 and the optical axis is HIF612 (instance). The image-side surface of the sixth lens element has one inflection point IF622 which is the second nearest to the optical axis and the sinkage value of the inflection point IF622 is denoted by SGI622 (instance). SGI622 is a horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the inflection point which is the second nearest to the optical axis on the image-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF622 and the optical axis is HIF622 (instance).
The object-side surface of the sixth lens element has one inflection point IF613 which is the third nearest to the optical axis and the sinkage value of the inflection point IF613 is denoted by SGI613 (instance), SGI613 is a horizontal shift distance in parallel with the optical axis from an axial point on the object-side surface of the sixth lens element to the inflection point which is the third nearest to the optical axis on the object-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF613 and the optical axis is HIF613 (instance). The image-side surface of the sixth lens element has one inflection point IF623 which is the third nearest to the optical axis and the sinkage value of the inflection point IF623 is denoted by SGI623 (instance). SGI623 is a horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the inflection point which is the third nearest to the optical axis an the image-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF623 and the optical axis is HIF623 (instance).
The object-side surface of the sixth lens element has one inflection point IF614 which is the fourth nearest to the optical axis and the sinkage value of the inflection point IF614 is denoted by SGI614 (instance). SGI614 is a horizontal shift distance in parallel with the optical axis from an axial point on the object-side surface of the sixth lens element to the inflection point which is the fourth nearest to the optical axis on the object-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF614 and the optical axis is HIF614 (instance). The image-side surface of the sixth lens element has one inflection point IF624 which is the fourth nearest to the optical axis and the sinkage value of the inflection point IF624 is denoted by SGI624 (instance). SGI624 is as horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the inflection point which is the fourth nearest to the optical axis on the image-side surface of the sixth lens element. A distance perpendicular to the optical axis between the inflection point IF624 and the optical axis is HIF624 (instance).
The inflection points on the object-side surfaces or the image-side surfaces of the other lens elements and the distances perpendicular to the optical axis thereof or the sinkage values thereof are denoted in the similar way described above.
The lens element parameter related to an aberration
Optical distortion for image formation in the optical image capturing system is denoted by ODT. TV distortion for image formation in the optical image capturing system is denoted by TDT. Further, the range of the aberration offset for the view of image formation may be limited to 50%-100%. An offset of the spherical aberration is denoted by DES. An offset of the coma aberration is denoted by DFC.
The vertical coordinate axis of the characteristic diagram of modulation transfer function represents a contrast transfer rate (values are from 0 to 1). The horizontal coordinate axis represents as spatial frequency (cycles/mm; lp/mm; line pairs per mm). Theoretically, an ideal image capturing system can 100% show the line contrast of a photographed object. However, the values of the contrast transfer rate at the vertical coordinate axis are smaller than 1 in the actual image capturing system. The transfer rate of its comparison value is less than a vertical axis. In addition, comparing to the central region, it is generally more difficult to achieve a fine degree of recovery in the edge region of image capturing. The contrast transfer rates (MTF values) with spatial frequencies of 55 cycles/m at the optical axis, 0.3 field of view and 0.7 field of view of a visible spectrum on the image plane are respectively denoted by MTFE0, MTFE3 and MTFE7. The contrast transfer rates (MTF values) with spatial frequencies of 110 cycles/m at the optical axis, 0.3 field of view and 0.7 field of view on the image plane are respectively denoted by MTFQ0, MTFQ3 and MTFQ7. The contrast transfer rates (MTF values) with spatial frequencies of 220 cycles/m at the optical axis, 0.3 field of view and 0.7 field of view on the image plane are respectively denoted by MTFH0, MTFH3 and MTFH7. The contrast transfer rates (MTF values) with spatial frequencies of 440 cycles/m at the optical axis, 0.3 field of view and 0.7 field of view on the image plane are respectively denoted by MTF0, MTF3 and MTF7. The three fields of view described above are representative to the centre, the internal field of view and the external field of view of the lens elements. Thus, they may be used to evaluate whether the performance of a specific optical image capturing system is excellent. The design of the optical image capturing system of the present invention mainly corresponds to a pixel size in which a sensing device below 1.12 micrometers is includes. Therefore, the quarter spatial frequencies, the half spatial frequencies (half frequencies) and the full spatial frequencies (full frequencies) of the characteristic diagram of modulation transfer function respectively are at least 110 cycles/mm, 220 cycles/mm and 440 cycles/mm.
If an optical image capturing system needs to satisfy with the images aimed to infrared spectrum, such as the requirement for night vision with lower light source, the used wavelength may be 850 nm or 800 nm. As the main function is to recognize shape of an object thrilled in monochrome and shade, the high resolution is unnecessary, and thus, a spatial frequency, which is less than 100 cycles/mm, is used to evaluate the functionality of the optical image capturing system, when the optical image capturing system is applied to the infrared spectrum. When the foregoing wavelength 850 nm is applied to focus on the image plane, the contrast transfer rates (MTF values) with a spatial frequency of 55 cycles/mm at the optical axis, 0.3 field of view and 0.7 field of view on the image plane are respectively denoted by MTFI0, MTFI3 and MTFI7. However, the infrared wavelength of 850 nm or 800 nm may be hugely different to wavelength of the regular visible light wavelength, and thus, it is hard to design an optical image capturing system which has to focus on the visible light and the infrared light (dual-mode) simultaneously while achieve a certain function respectively.
The disclosure provides an optical image capturing system, which is able to focus on the visible light and the infrared light (dual-mode) simultaneously while achieve a certain function respectively, and an object-side surface or an image-side surface of the fourth lens element has inflection points, such that the angle of incidence from each field of view to the fourth lens element can be adjusted effectively and the optical distortion and the TV distortion can be corrected as well. Besides, the surfaces of the fourth lens element may have a better optical path adjusting ability to acquire better imaging quality.
The disclosure provides an optical image capturing system, in order from an object side to an image side, including a first, second, third, fourth, fifth, sixth lens elements and an image plane. The first lens element has refractive power. An object-side surface and an image-side surface of the sixth lens element are aspheric. Focal lengths of the first through sixth lens elements are f1, f2, f3, f4, f5 and f6 respectively. A focal length of the optical image capturing system is f. An entrance pupil diameter of the optical image capturing system is HEP. A distance from an object-side surface of the first lens element to the image plane is HOS. Thicknesses in parallel with an optical axis of the first through sixth lens elements at height ½ HEP respectively are ETP1, ETP2, ETP3, ETP4, ETP5 and ETP6. A sum of ETP1 to ETP6 described above is SETP. Thicknesses of the first through sixth lens elements on the optical axis respectively are TP1, TP2, TP3, TP4, TP5 and TP6. A sum of TP1 to TP6 described above is STP. The following relations are satisfied: 1.2≦f/HEP≦10.0 and 0.5≦SETP/STP<1.
The disclosure provides another optical image capturing system, in order from an object side to an image side, including a first, second, third, fourth, fifth, sixth lens elements and an image plane. The first lens element has negative refractive power, and the position near the optical axis on an object-side surface of the first lens element may be a convex surface. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element has refractive power. The sixth lens element has refractive power, and an object-side surface and an image-side surface of the sixth lens element are aspheric. A maximum height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, and at least one lens element among the first through the sixth lens elements is made of glass material. At least one of the second through sixth lens elements has positive refractive power. Focal lengths of the first through sixth lens elements are f1, f2, f3, f4, f5 and f6 respectively. A focal length of the optical image capturing system is f. An entrance pupil diameter of the optical image capturing system is HEP. A distance from an object-side surface of the first lens element to the image plane is HOS. A horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to the image plane is ETL. A horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to a coordinate point on the image-side surface of the sixth lens element at height ½ HEP is EIN. The following relations are satisfied: 1.2≦f/HEP≦10.0, HOI>3.0 mm and 0.2≦EIN/ETL<1.
The disclosure provides another optical image capturing system, in order from an object side to an image side, including a fast, second, third, fourth, fifth, sixth lens elements and an image plane. Wherein the optical image capturing system consists of six lens elements with refractive power, a maximum height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, and ay one of the first through the sixth lens elements is made of glass material. An object-side surface and an image-side surface of at least one lens element of the six lens elements are aspheric. The first lens element has negative refractive power. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has positive refractive power. The fifth lens element has refractive power. The sixth lens element has refractive power. Focal lengths of the first through sixth lens elements are f1, f2, f3, f4, f5, and f6 respectively. A focal length of the optical image capturing system is f. An entrance pupil diameter of the optical image capturing system is HEP. A half of maximum view angle of the optical image capturing system is HAF. A distance from an object-side surface of the first lens element to the image plane is HOS. A horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the last lens element at height ½ HEP to the image plane is ETL. A horizontal distance in parallel with the optical axis from a coordinate point, on the object-side surface of the first lens element at height ½ HEP to a coordinate point on the image-side surface of the sixth lens element at height ½ HEP is EIN. The following relations are satisfied: 1.2≦f/HEP≦3.0, 0.4≦|tan(HAF)|≦6.0, HOI>3.0 mm and 0.2≦EIN/ETL<1.
A thickness of a single lens element at height of ½ entrance pupil diameter (HEP) particularly affects the corrected aberration of common area of each field of view of light and the capability of correcting optical path difference between each field of view of light in the scope of ½ entrance pupil diameter (HEP). The capability of aberration correction is enhanced if the thickness becomes greater, but the difficulty for manufacturing is also increased at the same time. Therefore, it is necessary to control the thickness of a single lens element at height of ½ entrance pupil diameter (HEP), in particular to control the ratio relation (ETP/TP) of the thickness (ETP) of the lens element at height of ½ entrance pupil diameter (HEP) to the thickness (TP) of the lens element to which the surface belongs on the optical axis. For example, the thickness of the first lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP 1. The thickness of the second lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP2. The thicknesses of other lens elements are denoted in the similar way. A sum of ETP1 to ETP6 described above is SETP. The embodiments of the present invention may satisfy the following relation: 0.3≦SETP/EIN<1.
In order to enhance the capability of aberration correction and reduce the difficulty for manufacturing at the same time, it is particularly necessary to control the ratio relation (ETP/TP) of the thickness (ETP) of the lens element at height of ½ entrance pupil diameter (HEP) to the thickness (TP) of the lens element on the optical axis lens. For example, the thickness of the first lens element at height of ½ entrance pupil diameter (REP) is denoted by ETP1. The thickness of the first lens element on the optical axis is TP1. The ratio between both of them is ETP1/TP1. The thickness of the second lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP2. The thickness of the second lens element on the optical axis is TP2. The ratio between both of them is ETP2/TP2. The ratio relations of the thicknesses of other lens element in the optical image capturing system at height of ½ entrance pupil diameter (HEP) to the thicknesses (TP) of the lens elements on the optical axis lens are denoted in the similar way. The embodiments of the present invention may satisfy the following relation: 0.2≦ETP/TP≦3.
A horizontal distance between two adjacent lens elements at height of ½ entrance pupil diameter (HEP) is denoted by ED. The horizontal distance (ED) described above is in parallel with the optical axis of the optical image capturing system and particularly affects the corrected aberration of common area of each field of view of light and the capability of correcting optical path difference between each field of view of light at the position of ½ entrance pupil diameter (HEP). The capability of aberration correction may be enhanced if the horizontal distance becomes greater, but the difficulty for manufacturing is also increased and the degree of ‘miniaturization’ to the length of the optical image capturing system is restricted. Thus, it is essential to control the horizontal distance (ED) between two specific adjacent lens elements at height of ½ entrance pupil diameter (HEP).
In order to enhance the capability of aberration correction and reduce the difficulty for ‘miniaturization’ to the length of the optical image capturing system at the same time, it is particularly necessary to control the ratio relation (ED/IN) of the horizontal distance (ED) between the two adjacent lens elements at height of ½ entrance pupil diameter (HEP) to the horizontal distance (IN) between the two adjacent lens elements on the optical axis. For example, the horizontal distance between the first lens element and the second lens element at height of ½ entrance pupil diameter (HEP) is denoted by ED12. The horizontal distance between the first lens element and the second lens element on the optical axis is IN12. The ratio between both of them is ED12/IN12. The horizontal distance between the second lens element and the third lens element, at height of ½ entrance pupil diameter (HEP) is denoted by ED23. The horizontal distance between the second lens element and the third lens element on the optical axis is IN23. The ratio between both of them is ED23/IN23. The ratio relations of the horizontal distances between other two adjacent lens elements in the optical image capturing system at height of ½ entrance pupil diameter (HEP) to the horizontal distances between the two adjacent lens elements on the optical axis are denoted in the similar way.
A horizontal distance in parallel with the optical axis from a coordinate point on the image-side surface of the sixth lens element at height ½ HEP to the image plane is EBL. A horizontal distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the image plane is BL. The embodiments of the present invention enhance the capability of aberration correction and reserve space for accommodating other optical elements. The following relation may be satisfied: 0.2≦EBL/BL<1.1. The optical image capturing system may further include a light filtration element. The light filtration element is located: between the sixth lens element and the image plane. A distance in parallel with the optical axis from a coordinate point on the image-side face of the sixth lens element at height ½ HEP to the light filtration element is EIR. A distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the light, filtration element is PIR. The embodiments of the present invention may satisfy the following relation; 0.1≦EIR/PIR≦1.1.
The height of optical system (HOS) may be reduced to achieve the minimization of the optical image capturing system when the absolute value of f1 is larger than f6 (|f1|>f6).
When |f2|+|f3|+|f4|+|f5| and |f1|+|f6| are satisfied with above relations, at least one of the second through fifth lens elements may have weak positive refractive power or weak negative refractive power. The weak refractive power indicates that an absolute value of the focal length of a specific lens element is greater than 10. When at least one of the second through fifth lens elements has the weak positive refractive power, the positive refractive power of the first lens element can be shared, such that the unnecessary aberration will not appear too early. On the contrary, when at least one of the second through fifth lens elements has the weak negative refractive power, the aberration of the optical image capturing system can be corrected and fine tuned.
The sixth lens element may have negative refractive power and a concave image-side surface. Hereby, the back focal length is reduced for keeping the miniaturization, to miniaturize the lens element effectively. In addition, at least one of the object-side surface and the image-side surface of the sixth lens element may have at least one inflection point, such that the angle of incident with incoming light from an off-axis field of view can be suppressed effectively and the aberration in the off-axis field of view can be corrected further.
The detailed structure, operating principle and effects of the present disclosure will now be described in more details hereinafter with reference to the accompanying drawings that show various embodiments of the present disclosure as follows.
Reference will now be made in detail to the exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Therefore, it is to be understood that the foregoing is illustrative of exemplary embodiments and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed exemplary embodiments, as well as other exemplary embodiments, are intended to be Included within the scope of the appended claims. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the an. The relative proportions and ratios of elements in the drawings may be exaggerated or diminished in size for the sake of clarity and convenience in the drawings, and such arbitrary proportions are only illustrative and not limiting in any way. The same reference numbers are used in the drawings and the description to refer to the same or like parts.
It will be understood that, although the terms ‘first’, ‘second’, ‘third’, etc., may be used herein to describe various elements, these elements should not be limited by these terms. The terms are used only for the purpose of distinguishing one component from another component. Thus, a first element discussed below could be termed a second element without departing from the teachings of embodiments. As used herein, the term “or” includes any and all combinations of one or more of the associated listed items.
An optical image capturing system, in order from an object side to an image side, includes a first, second, third, fourth, fifth and sixth lens elements with refractive power and an image plane. The optical image capturing system may further include an image sensing device which is disposed on an image plane.
The optical image capturing system may use three sets of wavelengths which are 486.1 nm, 587.5 nm and 656.2 nm, respectively, wherein 587.5 nm is served as the primary reference wavelength and a reference wavelength for retrieving technical features. The optical image capturing system may also use five sets of wavelengths which are 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, wherein 555 nm is served as the primary reference wavelength and a reference wavelength for retrieving technical features.
A ratio of the focal length f of the optical image capturing system to a focal length fp of each of lens elements with positive refractive power is PPR. A ratio of the focal length f of the optical image capturing system to a focal length fn of each of lens elements with negative refractive power is NPR. A sum of the PPR of all lens elements with positive refractive power is ΣPPR. A sum of the NPR of all lens elements with negative refractive powers is ΣNPR. It is beneficial to control the total refractive power and the total length of the optical image capturing system when following conditions are satisfied: 0.5≦ΣPPR/NPR/|ΣNPR|≦15. Preferably, the following relation may be satisfied: 1≦ΣPPR/|ΣNPR|≦3.0.
The optical image capturing system may further include an image sensing device which is disposed on an image plane. Half of a diagonal of an effective detection field of the image sensing device (imaging height or the maximum image height of the optical image capturing system) is HOI. A distance on the optical axis from the object-side surface of the first lens element to the image plane is HOS. The following relations are satisfied: HOS/HOI≦50 and 0.5≦HOS/f≦150. Preferably, the following relations may be satisfied: 1≦HOS/HOI≦40 and 1≦HOS/f≦140. Hereby, the miniaturization of the optical image capturing system can be maintained effectively, so as to be carried by lightweight portable electronic devices.
In addition, in the optical image capturing system of the disclosure, according to different requirements, at least one aperture stop may be arranged for reducing stray light and improving the imaging quality.
In the optical image capturing system of the disclosure, the aperture stop may be a front or middle aperture. The front aperture is the aperture stop between a photographed object and the first lens element. The middle aperture is the aperture stop between the first lens element and the image plane. If the aperture stop is the front aperture, a longer distance between the exit pupil and the image plane of the optical image capturing system can be formed, such that more optical elements can be disposed in the optical image capturing system and the efficiency of receiving images of the image sensing device can be raised. If the aperture stop is the middle aperture, the view angle of the optical image capturing system can be expended, such that the optical image capturing system has the same advantage that is owned by wide angle cameras. A distance from the aperture stop to the image plane is InS. The following relation is satisfied: 0.1≦InS/HOS≦1.1. Hereby, features of maintaining the minimization for the optical image capturing system and having wide-angle are available simultaneously.
In the optical image capturing system of the disclosure, a distance from the object-side surface of the first lens element to the image-side surface of the sixth lens element is InTL. A sum of central thicknesses of all lens elements with refractive power on the optical axis is ΣTP. The following relation is satisfied: 0.1≦ΣTP/InTL≦0.9. Hereby, contrast ratio for the image formation in the optical image capturing system and defect-free rate for manufacturing the lens element can be given consideration simultaneously, and a proper back focal length is provided to dispose other optical components in the optical image capturing system.
A curvature radius of the object-side surface of the first lens element is R1. A curvature radius of the image-side surface of the first lens element is R2. The following relation is satisfied: 0.001≦|R1/R2|≦25. Hereby, the first lens element may have proper strength of the positive refractive power, so as to avoid the longitudinal spherical aberration to increase too fast. Preferably, the following relation may he satisfied: 0.01≦|R1/R2<12.
A curvature radius of the object-side surface of the sixth lens element is R11. A curvature radius of the image-side surface of the sixth lens element is R12. The following relation is satisfied: −7<(R11−R12)/(R11+R12)<50. Hereby, the astigmatism generated by the optical image capturing system can be corrected beneficially.
A distance between the first lens element and the second lens element on the optical axis is IN12. The following relation is satisfied: IN12/f≦60. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
A distance between the fifth lens element and the sixth lens element on the optical axis is IN56. The following relation is satisfied: IN56/f≦3.0. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
Central thicknesses of the first lens element and the second lens element on the optical axis are TP1 and TP2, respectively. The following relation is satisfied: 0.1≦(TP1+IN12)/TP2≦10. Hereby, the sensitivity produced by the optical image capturing system can be controlled, and the performance can be increased.
Central thicknesses of the fifth lens element and the sixth lens element on the optical axis are TP5 and TP6, respectively, and a distance between the aforementioned two lens elements on the optical axis is IN56. The following relation is satisfied: 0.1≦(TP6+IN56)/TP5≦15. Hereby, the sensitivity produced by the optical image capturing system can be controlled and the total height of the optical image capturing system can be reduced.
Central thicknesses of the second lens element, the third lens element and the fourth lens element on the optical axis are TP2, TP3 and TP4, respectively. A distance between the second lens element and the third lens element on the optical axis is IN23. A distance between the third lens element and the fourth lens element on the optical axis is IN34. A distance between the fourth lens element and the fifth lens element on the optical axis is IN45. A distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element is Inn The following relation is satisfied: 0.1≦TP4/(IN34+TP4+IN45)<1. Hereby, the aberration generated by the process of moving the incident light can be adjusted slightly layer upon layer, and the total height of the optical image capturing system can be reduced.
In the optical image capturing system of the disclosure, a distance perpendicular to the optical axis between a critical point C61 on the object-side surface of the sixth lens element and the optical this is HVT61. A distance perpendicular to the optical axis between a critical point C62 on the image-side surface of the sixth lens element and the optical axis is HVT62. A horizontal displacement distance on the optical axis from an axial point on the object-side surface of the sixth lens element to the critical point C61 is SGC61. A horizontal displacement distance on the optical axis from an axial point on the image-side surface of the sixth lens element to the critical point C62 is SGC62. The following relations may be satisfied: 0 min≦HVT61≦3 mm, 0 mm<HVT62≦6 mm, 0≦HVT61/HVT62, 0 mm≦|SGC61|≦0.5 mm, 0 mm<″SGC62|≦2 mm and 0<|SGC62|/(|SGC62|+TP6)≦0.9. Hereby, the aberration in the off-axis view field can be corrected.
The optical image capturing system of the disclosure satisfies the following relation: 0.2≦HVT62/HOI≦0.9. Preferably, the following relation may be satisfied: 0.3≦HVT62/HOS≦0.8. Hereby, the aberration of surrounding view field can be corrected.
The optical image capturing system of the disclosure satisfies the following relation: 0≦HVT62/HOS≦0.5. Preferably, the following relation may be satisfied: 0.2≦HVT62/HOS≦0.45. Hereby, the aberration of surrounding view field can be corrected.
In the optical image capturing system of the disclosure, a distance in parallel with an optical axis from an inflection point on the object-side surface of the sixth lens element which is nearest to the optical axis to an axial point on the object-side surface of the sixth lens element is denoted by SGI611. A distance in parallel with an optical axis from an inflection point on the image-side surface of the sixth lens element which is nearest to the optical axis to an axial point on the image-side surface of the sixth lens element is denoted by SGI621. The following relations are satisfied: 0<SGI611/(SGI611+TP6)≦0.9 and 0<SGI621/(SGI621+TP6)≦0.9. Preferably, the following relations may be satisfied: 0.1≦SGI611/(SGI611+TP6)≦0.6 and 0.1≦SGI621/(SGI621+TP6)≦0.6.
A distance in parallel with the optical axis from the inflection point on the object-side surface of the sixth lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the sixth lens element is denoted by SGI612. A distance in parallel with an optical axis from an inflection point on the image-side surface of the sixth lens element which is the second nearest to the optical axis to an axial point on the image-side surface of the sixth lens element is denoted by SGI622. The following relations are satisfied: 0<SGI612/(SGI612+TP6)≦0.9 and 0<SGI622/(SGI622+TP6)≦0.9. Preferably, the following relations may be satisfied: 0.1≦SGI612/(SGI612+TP6)≦0.6 and 0.1≦SGI622/(SGI622+TP6)≦0.6.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is nearest to the optical axis and the optical axis is denoted by HIF611. A distance perpendicular to the optical axis between an inflection point on the image-side surface of the sixth lens element which is nearest to the optical axis and an axial point on the image-side surface of the sixth lens element is denoted by HIF621. The following relations are satisfied: 0.001 mm≦|HF611|≦5 mm and 0.001 mm≦|HIF621|≦5 mm. Preferably, the following relations may be satisfied: 0.1 mm≦|HIF611|≦3.5 mm and 1.5 mm≦|HIF621|≦3.5 mm.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF612. A distance perpendicular to the optical axis between an axial point on the image-side surface of the sixth lens element and an inflection point on the image-side surface of the sixth lens element which is the second nearest to the optical axis is denoted by HIF622. The following relations are satisfied: 0.001 mm≦|HIF612|≦5 mm and 0.001 mm≦|HIF622|≦5 mm. Preferably, the following relations may be satisfied: 0.1 mm≦|HIF622|≦3.5 mm and 0.1 mm≦|HIF612|≦3.5 mm.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is the third nearest to the optical axis and the optical axis is denoted by HIF613. A distance perpendicular to the optical axis between an axial point on the image-side surface of the sixth lens element and an inflection point on the image-side surface of the sixth lens element which is the third nearest to the optical axis is denoted by HIF623. The following relations are satisfied: 0.001 mm≦|HIF613|≦5 mm and 0.001 mm≦|HIF623|≦5 mm. Preferably, the following relations may be satisfied: 0.1 mm≦|HIF623|≦3.5 mm and 0.1 mm≦|HIF613|≦3.5 mm.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is the fourth nearest to the optical axis and the optical axis is denoted by HIF614. A distance perpendicular to the optical axis between an axial point on the image-side surface of the sixth lens element and an inflection point on the image-side surface of the sixth lens element which is the fourth nearest to the optical axis is denoted by HIF624. The following relations are satisfied: 0.001 mm≦|HIF614|≦5 mm and 0,001 mm≦|HIF624|≦5 mm. Preferably, the following relations may he satisfied: 0.1 mm≦|HIF624|≦3.5 mm and 0.1 mm≦|HIF614|≦3.5 mm.
In one embodiment of the optical image capturing system of the present disclosure, the chromatic aberration of the optical image capturing system can be corrected by alternatively arranging the lens elements with large Abbe number and small Abbe number.
The above Aspheric formula is:
z=ch2/[1+[1−(k+1)c2h2]0.5]+A4h4+A6h6+A8h8+A10h10+A12h12+A14h14+A16h16+A18h18+A20h20+ (1),
where z is a position value of the position along the optical axis and at the height h which reference to the surface apex; k is the conic coefficient, c is the reciprocal of curvature radius, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are high order aspheric coefficients.
The optical image capturing system provided by the disclosure, the lens elements may be made of glass or plastic material, if plastic material is adopted to produce the lens elements, the cost of manufacturing will be lowered effectively. If lens elements are made of glass, the heat effect can be controlled and the designed space arranged for the refractive power of the optical image capturing system can be increased. Besides, the object-side surface and the image-side surface of the first through sixth lens elements may be aspheric, so as to obtain more control variables. Comparing with the usage of traditional lens element made by glass, the number of lens elements used can be reduced and the aberration can be eliminated. Thus, the total height of the optical image capturing system can be reduced effectively.
In addition, in the optical image capturing system provided by the disclosure, if the lens element has a convex surface, the surface of the lens element adjacent to the optical axis is convex in principle, if the lens element has a concave surface, the surface of the lens element adjacent to the optical axis is concave in principle.
The optical image capturing system of the disclosure can be adapted to the optical image capturing system with automatic focus if required. With the features of a good aberration correction and a high quality of image formation, the optical image capturing system can be used in various application fields.
The optical image capturing system of the disclosure can include a driving module according to the actual requirements. The driving module may be coupled with the lens elements to enable the lens elements producing, displacement. The driving module may be the voice coil motor (VCM) which is applied to move the lens to focus, or may be the optical image stabilization (OIS) which is applied to reduce the distortion frequency owing to the vibration of the lens while shooting.
At least one of the first, second, third, fourth, fifth and sixth lens elements of the optical image capturing system of the disclosure may further be designed as a light filtration element with a wavelength of less than 500 nm according to the actual requirement. The light filtration element may he made by coating at least one surface of the specific lens element characterized of the filter function, and alternatively, may be made by the lens element per se made of the material which is capable of filtering short wavelength.
According to the above embodiments, the specific embodiments with figures are presented in detail as below.
The First Embodiment (Embodiment 1)Please refer to
The first lens element 110 has negative refractive power and it is made of plastic material. The first lens element 110 has a concave object-side surface 112 and a concave image-side surface 114, and both of the object-side surface 112 and the image-side surface 114 are aspheric. The object-side surface 112 has two inflection points. The thickness of the first lens element on the optical axis is TP1. The thickness of the first lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP1.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the first lens element which is nearest to the optical axis to an axial point on the object-side surface of the first lens element is denoted by SGI111. A distance in parallel with an optical axis from an inflection point on the image-side surface of the first lens element which is nearest to the optical axis to an axial point on the image-side surface of the first lens element is denoted by SGI121. The following relations are satisfied: SGI111=−0.0031 mm and |SGI111|/(|SGI111|′TP1)=0.0016.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the first lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the first lens element is denoted by SGI112. A distance in parallel with an optical axis from an inflection point on the image-side surface of the first lens element which is the second nearest to the optical axis to an axial point on the image-side surface of the first lens element is denoted by SGI122. The following relations are satisfied: SGI112=1.3178 mm and |SGI112//(SGI112|+TP1)=0.4052.
A distance perpendicular to the optical axis from the inflection point on the object-side surface of the first lens element which is nearest to the optical axis to an axial point on the object-side surface of the first lens element is denoted by HIF111. A distance perpendicular to the optical axis from the inflection point on the image-side surface of the first lens element which is nearest to the optical axis to an axial point on the image-side surface of the first lens element is denoted by HIF121. The following relations are satisfied: HIF111=0.5557 mm and HIF111/HOI=0.1111.
A distance perpendicular to the optical axis from the inflection point on the object-side surface of the first lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the first lens element is denoted by HIF112. A distance perpendicular to the optical axis from the inflection point on the image-side surface of the first lens element which is the second nearest to the optical axis to an axial point on the image-side surface of the first lens element is denoted by HIF122. The following relations are satisfied: HIF112=5.3732 mm and HIF112/HOI=1.0746.
The second lens element 120 has positive refractive power and it is made of plastic material. The second lens element 120 has a convex object-side surface 122 and a convex image-side surface 124, and both of the object-side surface 122 and the image-side surface 124 are aspheric. The object-side surface 122 has an inflection point. The thickness of the second lens element on the optical axis is TP2. The thickness of the second lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP2.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the second lens element which is nearest to the optical axis to an axial point on the object-side surface of the second lens element is denoted by SGI211. A distance in parallel with an optical axis from an inflection point on the image-side surface of the second lens element which is nearest to the optical axis to an axial point on the image-side surface of the second lens element is denoted by SGI221. The following relations are satisfied: SGI211=0.1069 mm, |SGI211|/(|SGI211|+TP2)=0.0412, SGI221=0 mm and |SGI221|/(|SGI221|+TP2)=0.
A distance perpendicular to the optical axis from the inflection point on the object-side surface of the second lens element which is nearest to the optical axis to an axial point on the object-side surface of the second lens element is denoted by HIF211. A distance perpendicular to the optical axis from the inflection point on the image-side surface of the second lens element which is nearest to the optical axis to an axial point on the image-side surface of the second lens element is denoted by HIF221. The following relations are satisfied: HIF211=11.264 mm, HIF211/HOI=0.2253, HIF221=0 mm and HIF221/HOI=0.
The third lens element 130 has negative refractive power and it is made of plastic material. The third lens element 130 has a concave object-side surface 132 and a convex image-side surface 134, and both of the object-side surface 132 and the image-side surface 134 are aspheric. The object-side surface 132 and the image-side surface 134 both have an inflection point. The thickness of the third lens element on the optical axis is TP3. The thickness of the third lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP3.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the third lens element which is nearest to the optical axis to an axial point on the object-side surface of the third lens element is denoted by SGI311. A distance in parallel with an optical axis from an inflection point on the image-side surface of the third lens element which is nearest to the optical axis to an axial point on the image-side surface of the third lens element is denoted by SGI321. The following relations are satisfied: SGI311=−0.3041 mm, |SGI311|/(SGI311|++TP3)=0.4445, SGI321=−0.1172 mm and |SGI321|/(|SGI321|+TP3)=0.2357.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the third lens element which is nearest to the optical axis and the optical axis is denoted by HIF311. A distance perpendicular to the optical axis from the inflection point on the image-side surface of the third lens element which is nearest to the optical axis to an axial point on the image-side surface of the third lens element is denoted by HIF321. The following relations are satisfied: HIF311=1.5907 mm, HIF311/HOI=0.3181, HIF321=1.3380 mm and HIF321/HOI=0.2676.
The fourth lens element 140 has positive refractive power and it is made of plastic material. The fourth lens element 140 has a convex object-side surface 142 and a concave image-side surface 144, and both of the object-side surface 142 and the image-side surface 144 are aspheric. The object-side surface 142 has two inflection points and the image-side surface 144 has an inflection point. The thickness of the fourth lens element on the optical axis is TP4. The thickness of the fourth lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP4.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the fourth lens element which is nearest to the optical axis to art axial point on the object-side surface of the fourth lens element is denoted by SGI411. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fourth lens element which is nearest to the optical axis to an axial point on the image-side surface of the fourth lens element is denoted by SGI421. The following relations are satisfied: SGI411=0.0070 mm, |SGI411|/(|SGI411″+TP4)=0.0056, SGI421=0.0006 mm and |SGI421|/(|SGI411|+TP4)=0.0005.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the fourth lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the fourth lens element is denoted by SGI412. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fourth lens element which is the second nearest to the optical axis to an axial point on the image-side surface of the fourth lens element is denoted by SGI422. The following relations are satisfied: SGI412=−0.2078 mm and SGI412|/(|SGI412|+TP4)=0.1439.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth lens element which is nearest to the optical axis and the optical axis is denoted by HIF411. A distance perpendicular to the optical axis between the inflection point on the image side surface of the fourth lens element which is nearest to the optical axis and the optical axis is denoted by HIF421. The following relations are satisfied: HIF411=0.4706 mm, HIF411/HOI=0.0941, HIF421=0.1721 mm and HIF421/HOI=0.0344.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth tens element which is the second nearest to the optical axis and the optical axis is denoted by HIF412. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the fourth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF422. The following relations are satisfied: HIF412=2.0421 mm and HIF412/HOI=0.4084.
The fifth tens element 150 has positive refractive power and it is made of plastic material. The fifth lens element 150 has a convex object-side surface 152 and a convex image-side surface 154, and both of the object-side surface 152 and the image-side surface 154 are aspheric. The object-side surface 152 has two inflection points and the image-side surface 154 has an inflection point. The thickness of the fifth lens element on the optical axis is TP5. The thickness of the fifth lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP5.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the fifth lens element which is nearest to the optical axis to an axial point on the object-side surface of the fifth lens element is denoted b SGI511. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fifth lens element which is nearest to the optical axis to an axial point on the image-side surface of the fifth lens element is denoted by SGI521. The following relations are satisfied: SGI511=0.00364 mm, |SGI511|/(SGI511|+TP5)=0.00338. SGI521=−0.63365 mm and |SGI521|/(|SGI521|+TP5)=0.37154.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the fifth lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the fifth lens element is denoted by SGI512. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fifth lens element which is the second nearest to the optical axis to an axial point on the image-side surface of the fifth lens element is denoted by SGI522. The following relations are satisfied: SGI512=−0.32032 mm and |SGI512|/(|SGI512|+TP5)=0.23009.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the fifth lens element which is the third nearest to the optical axis to an axial point on the object-side surface of the fifth lens element is denoted by SGI513. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fifth lens element which is the third nearest to the optical axis to an axial point en the image-side surface of the fifth lens element is denoted by SGI523. The following relations are satisfied: SGI513=0 mm, |SGI513|/(|SGI513|+TP5)=0, SGI523=0 mm and |SGI523|/(|SGI523|+TP5)=0.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the fifth lens element which is the fourth nearest to the optical axis to an axial point on the object-side surface of the fifth lens element is denoted by SGI514. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fifth lens element which is the fourth nearest to the optical axis to an axial point on the image-side surface of the fifth lens element is denoted by SGI524. The following relations are satisfied: SGI514=0 mm, |SGI514|/(|SGI514+|TP5)=0, SGI524=0 mm and |SGI524|/(|SGI524|+TP5)=0.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fifth lens element which is nearest to the optical axis and the optical axis is denoted by HIF511. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the fifth lens element which is nearest to the optical axis and the optical axis is denoted by HIF521. The following relations are satisfied: HIF511=0.28212 mm, HIF511/HOI=0.05642, HIF521=2.13850 mm and HIF521/HOI=0.42770.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fifth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF512. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the fifth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF522. The following relations are satisfied: HIF512=2.5184 mm and HIF512/HOI=0.50277.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fifth lens element which is the third nearest to the optical axis and the optical axis is denoted by HIF513. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the fifth lens element which is the third nearest to the optical axis and the optical axis is denoted by HIF523. The following relations are satisfied: HIF513=0 mm, HIF513/HOI=0, HIF523=0 min and HIF523/HOI=0.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fifth lens element which is the fourth nearest to the optical axis and the optical axis is denoted by HIF514. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the filth lens element which is the fourth nearest to the optical axis and the optical axis is denoted by HIF524. The following relations are satisfied: HIF514=0 mm, HIF514/HOI=0, HIF524=0 mm and HIF524/HOI=0.
The sixth lens element 160 has negative refractive power and it is made of plastic material. The sixth lens element 160 has a concave object-side surface 162 and a concave image-side surface 164, and the object-side surface 162 has two inflection points and the image-side surface 164 has an inflection point. Hereby, the angle of incident of each view field on the sixth lens element can be effectively adjusted and the spherical aberration can thus be improved. The thickness of the sixth lens element on the optical axis is TP6. The thickness of the sixth lens element at height of ½ entrance pupil diameter (HEP) is denoted by ETP6.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the sixth lens element which is nearest to the optical axis to an axial point on the object-side surface of the sixth lens element is denoted by SGI611. A distance in parallel with an optical axis from an inflection point on the image-side surface of the sixth lens element which is nearest to the optical axis to an axial point on the image-side surface of the sixth lens element is denoted by SGI621. The following relations are satisfied: SGI611=0.38558 mm, |SGI611|/(|SGI611|+TP6)=0.27212, SGI621=0.12386 mm and |SGI621|/(|SGI621|+TP6)=0.10722.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the sixth lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the sixth lens element is denoted by SGI612. A distance in parallel with an optical axis from an inflection point on the image-side surface of the sixth lens element which is the second nearest to the optical axis to an axial point on the image-side surface of the sixth lens element is denoted by SGI621. The following relations are satisfied: SGI612=−0.47400 mm, |SGI612|/(|SGI612|+TP6)=0.31488, SGI622=0 mm and |SGI622|/(|SGI622|+TP6)=0.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is nearest to the optical axis and the optical axis is denoted by HIF611. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the sixth lens element which is nearest to the optical axis and the optical axis is denoted by HIF621. The following relations are satisfied: HIF611=2.24283 mm, HIF611/HOI=0.44857, HIF621=1.07376 mm and HIF621I/HOI=0.21475.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF612. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the sixth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF622. The following relations are satisfied: HIF612=2.48895 mm and HIF612/HOI=0.49779.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is the third nearest to the optical axis and the optical axis is denoted by HIF613. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the sixth lens element which is the third nearest to the optical axis and the optical axis is denoted by HIF623. The following relations are satisfied: HIF613=0 mm, HIF613/HOI=0, HIF623=0 mm and HIF623/HOI=0.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the sixth lens element which is the fourth nearest to the optical axis and the optical axis is denoted by HIF614. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the sixth lens element which is the fourth nearest to the optical axis and the optical axis is denoted by HIF624. The following relations are satisfied: HIF614=0 mm, HIF614/HOI=0, HIF624=0 min and HIF624/HOI=0.
In the first embodiment, a horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to the image plane is ETL. A horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to a coordinate point on the image-side surface of the sixth lens element at height ½ HEP is EIN. The following relations are satisfied: ETL=19.304 mm, EIN-15.733 mm and EIN/ETL=0.815.
The first embodiment satisfies the following relations: ETP1=2.371 mm, ETP2=2.134 mm, ETP3=0.497 mm, ETP4=1.111 mm, ETP5=1.783 mm and ETP6=1.404 mm. A sum of ETP1 to ETP6 described above SETP=9.300 mm, TP1=2.064 mm, TP2=2.500 mm, TP3=0.380 mm, TP4=1.186 mm, TP5=2.184 mm and TP6=1.105 mm. A sum of TP1 to TP6 described above STP=9.419 mm. SETP/STP=0.987. SETP/EIN-0.5911.
The present embodiment particularly controls the ratio relation (ETP/TP) of the thickness (ETP) of each lens element at height of ½ entrance pupil diameter (HEP) to the thickness (TP) of the lens element to which the surface belongs on the optical axis in order to achieve a balance between manufacturability and capability of aberration correction. The following relations are satisfied: ETP1/TP1=1.149, ETP2/TP2=0.854, ETP3/TP3=1.308, ETP4/TP4=0.936, ETP5/TP5=0.817 and ETP6/TP6=1.271.
The present embodiment controls a horizontal distance between each two adjacent lens elements at height of ½ entrance pupil diameter (HEP) to achieve a balance between the degree of miniaturization for the length of the optical image capturing system HOS, the manufacturability and the capability of aberration correction. The ratio relation (ED/IN) of the horizontal distance (ED) between the two adjacent lens elements at height of ½ entrance pupil diameter (HEP) to the horizontal distance (IN) between the two adjacent lens elements on the optical axis is particularly controlled. The following relations are satisfied; a horizontal distance in parallel with the optical axis between the first lens element and the second lens element at height of ½ entrance pupil diameter (HEP) ED12=5.285 mm; a horizontal distance in parallel with the optical axis between the second lens element and the third lens element at height of ½ entrance pupil diameter (HEP) ED23=0.283 mm; a horizontal distance in parallel with the optical axis between the third lens element and the fourth lens element at height of ½ entrance pupil diameter (HEP) ED34=0.330 mm; a horizontal distance in parallel with the optical axis between the fourth lens element and the fifth lens element at height of ½ entrance pupil diameter (HEP) ED45=0.348 mm; a horizontal distance in parallel with the optical axis between the fifth lens element and the sixth lens element at height of ½ entrance pupil diameter (HEP) ED56=0.187 mm. A sum of ED12 to ED56 described above is denoted as SED and SED=6.433 mm.
The horizontal distance between the first lens element and the second lens element on the optical axis IN12=5.470 mm and ED12/IN12=0.966. The horizontal distance between the second lens element and the third lens element on the optical axis IN23=0.178 mm and ED23/IN23=1.590. The horizontal distance between the third lens element and the fourth lens element on the optical axis IN34=0.259 mm and ED34/IN34=1.273. The horizontal distance between the fourth lens element and the fifth lens element on the optical axis IN45=0.209 mm and ED45/IN45=1.664. The horizontal distance between the fifth lens element and the sixth lens element on the optical axis IN56=0.034 mm and ED56/IN56=5.557. A sum of IN12 to IN56 described above is denoted as SIN. SIN=6.150 mm. SED/SIN=1.046.
The first embodiment also satisfies the following relations: ED12/ED23=18.685, ED23/ED34=0.857. ED34/ED45=0.947, ED45/ED56=1.859, IN12/IN23=30.746, IN23/IN34=0.686, IN34/IN45=1.239 and IN45/IN56=6.207.
A horizontal distance in parallel with the optical axis from a coordinate point on the image-side surface of the sixth lens element at height ½ HEP to the image plane. EBL=3.570 mm. A horizontal distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the image plane BL=4.032 mm. The embodiment of the present invention may satisfy the following relation: EBL/BL=0.854. In the present invention, a distance in parallel with the optical axis from a coordinate point on the image-side surface of the sixth lens element at height ½ HEP to the IR-bandstop filter EIR=1.950 mm. A distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the IR-bandstop filter PIR=2.121 mm. The following relation is satisfied: EIR/PIR=0.920.
The IR-bandstop filter 180 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 160 and the image plane 190.
In the optical image capturing system of the first embodiment, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, and half of a maximal view angle of the optical image capturing system is HAF. The detailed parameters are shown as below: f=4.075 ram, f/HEP=1.4, HAF=50.001 and tan(HAF)=1.1918.
In the optical image capturing system of the first embodiment, a focal length of the first lens element 110 is f1 and a focal length of the sixth lens element 160 is f6. The following relations are satisfied: f1×−7.828 mm, |f/f1|=0.52060, f6=−4.886 and |f1|>|f6|.
In the optical image capturing system of the first embodiment, focal lengths of the second lens element 120 to the filth lens element 150 are f2, f3, f4 and f5, respectively. The following relations are satisfied: |f2|+|f3|+|f4|+|f5|=95.508.15. mm, |f1|+|f6|=12.71352 mm and |f2|+|f3|+|f4|+|f5|>|f1|+|f6|.
A ratio of the focal length f of the optical image capturing system to a focal length fp of each of lens elements with positive refractive power is PPR. A ratio of the focal length f of the optical image capturing system to a focal length fn of each of lens elements with negative refractive power is NPR. In the optical image capturing system of the first embodiment, a sum of the PPR of all lens elements with positive refractive power is ΣPPR=f/f1+f/f3+f/f5=1.63290. A sum of the NPR of all lens elements with negative refractive powers is ΣNPR=|f/f1|+|f/f3|+|f/f6|=1.51305, ΣPPR/|ΣNPR|=1.07921. The following relations are also satisfied: f/f2|=0.69101, |f/f3|=0.15834, |f/f4|=0.06883, |f/f5|=0.87305 and |f/f6|=0.83412.
In the optical image capturing system of the first embodiment, a distance from the object-side surface 112 of the first lens element to the image-side surface 164 of the sixth lens element is InTL. A distance from the object-side surface 112 of the first lens element to the image plane 190 is HOS. A distance from an aperture 100 to an image plane 190 is InS. Half of a diagonal length of an effective detection field of the image sensing device 192 is HOI. A distance from the image-side surface 164 of the sixth lens element to the image plane 190 is BFL. The following relations are satisfied: InTL+BFL=HOS, HOS=19.54120 mm, HOI=5.0 and HOS/HOI=3.90824, HOS/f=4.7952, InS=11.685 mm and InS/HOS=0.59794.
In the optical image capturing system of the first embodiment, a total central thickness of all lens elements with refractive power on the optical axis is ΣTP. The following relations are satisfied: ΣTP=8.13899 mm and ΣTP/InTL=0.52477. Hereby, contrast ratio for the image formation in the optical image capturing system and defect-free rate for manufacturing the lens element can be given consideration simultaneously, and a proper back focal length is provided to dispose other optical components in the optical image capturing system.
In the optical image capturing system of the first embodiment, a curvature radius of the object-side surface 112 of the first lens element is R1. A curvature radius of the image-side surface 114 or the first lens element is R2. The following relation is satisfied: |R1/R2|=8.99987. Hereby, the first lens element may have proper strength of the positive refractive power, so as to avoid the longitudinal spherical aberration to increase too fast.
In the optical image capturing system of the first embodiment, a curvature radius of the object-side surface 162 of the sixth lens element is R11. A curvature radius of the image-side surface 164 of the sixth lens element is R12. The following relation is satisfied: (R11−R12)/(R11+R12)=1.27780. Hereby, the astigmatism generated by the optical image capturing system can be corrected beneficially.
In the optical image capturing system of the first embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relations are satisfied: ΣPP=f1+f3+f5=69.770 mm and f5/(f2+f4+f5)=0.067. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the first embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relations are satisfied: ΣNP=f1+f3+f6=−38.451 mm and f6/(f1+f3+f6)=0.127. Hereby, it is favorable for allocating the positive refractive power of the sixth lens element 160 to other negative lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the first embodiment, a distance between the first lens element 110 and the second lens element 120 on the optical axis is IN12. The following relations are satisfied: IN12=6.418 mm and IN12/f=1.57491. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
In the optical image capturing system of the first embodiment, a distance between the fifth lens element 150 and the sixth lens element 160 on the optical axis is IN56. The following relations are satisfied: IN56=0.025 mm and IN56/f=0.00613. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
In the optical image capturing system of the first embodiment, central thicknesses of the first lens element 110 and the second lens element 120 on the optical axis are TP1 and TP2, respectively. The following relations are satisfied: TP1=1.934 mm, TP2=2.486 mm and (TP1+IN12)/TP2=3.36005. Hereby, the sensitivity produced by the optical image capturing system can be controlled, and the performance can be increased.
In the optical image capturing system of the first embodiment, central thicknesses of the fifth lens element 150 and the sixth leas element 160 on the optical axis are TP5 and TP6, respectively, and a distance between the aforementioned two lens elements on the optical axis is IN56. The following relations are satisfied: TP5=1.072 mm, TP6=1.031 mm and (TP6+IN56)/TP5=0.98555. Hereby, the sensitivity produced by the optical image capturing system can be controlled and the total height of the optical image capturing system can be reduced.
In the optical image capturing system of the first embodiment, a distance between the third lens element 130 and the fourth lens element 140 on the optical axis is IN34. A distance between the fourth lens element 140 and the fifth lens element 150 on the optical axis is IN45. The following relations are satisfied: IN34=0.401 mm, IN45=0.025 mm and TP4/ (IN34+TP4+IN45)=0.74376. Hereby, the aberration generated by the process of moving the incident light can be adjusted slightly layer upon layer, and the total height of the optical image capturing system can be reduced.
In the optical image capturing system of the first embodiment, a distance in parallel with an optical axis from a maximum effective half diameter position to an axial point on the object-side surface 152 of the fifth lens element is InRS51. A distance in parallel with an optical axis from a maximum effective half diameter position to an axial point on the image-side surface 154 of the fifth lens element is InRS52. A central thickness of the fifth lens element 150 is TP5. The following relations are satisfied: InRS51=−0.34789 mm, InRS52=−0.88185 mm, |InRS51|/TP5=0.32458 and InRS52|/TP5=0.82276. Hereby, it is favorable for manufacturing and forming the lens element and for maintaining the minimization for the optical image capturing system.
In the optical image capturing system of the first embodiment, a distance perpendicular to the optical axis between a critical point C51 on the object-side surface 152 of the fifth lens element and the optical axis is HVT51. A distance perpendicular to the optical axis between a critical point C52 on the image-side surface 154 of the fifth lens element and the optical axis is HVT52. The following relations are satisfied: HVT51=0.515349 mm and HVT52=0 mm.
In the optical image capturing system of the first embodiment, a distance in parallel with an optical axis from a maximum effective half diameter position to an axial point on the object-side surface 162 of the sixth lens element is InRS61. A distance in parallel with an optical axis from a maximum effective half diameter position to an axial point on the image-side surface 164 of the sixth lens element is InRS62. A central thickness of the sixth lens element 160 is TP6. The following relations are satisfied: InRS61=−0.58390 mm, InRS42=0.41976 mm, |InRS61|/TP6=0.56616 and |InRS62=0.40700. Hereby, it is favorable for manufacturing and forming the lens element and for maintaining the minimization for the optical image capturing system.
In the optical image capturing system of the first embodiment, a distance perpendicular to the optical axis between a critical point C61 on the object-side surface 162 of the sixth lens element and the optical axis is HVT61. A distance perpendicular to the optical axis between a critical point C62 on the image-side surface 164 of the sixth lens element and the optical axis is HVT62. The following relations are satisfied: HVT61=0 mm and HVT62=0 mm.
In the optical image capturing system of the first embodiment, the following relation is satisfied: HVT51/HOI=0.1031. Hereby, the aberration of surrounding view field can be corrected.
In the optical image capturing system of the first embodiment, the following relation is satisfied: HVT51/HOS=0.02634. Hereby, the aberration of surrounding view field can be corrected.
In the optical image capturing system of the first embodiment, the second lens element 120, the third lens element 130 and the sixth lens element 160 have negative refractive power. An Abbe number of the second lens element is NA2. An Abbe number of the third lens element is NA3. An Abbe number of the sixth lens element is NA6. The following relation is satisfied: NA6/NA2≦1. Hereby, the chromatic aberration of the optical image capturing system can be corrected.
In the optical image capturing system of the first embodiment, TV distortion and optical distortion for image formation in the optical image capturing system are TDT and ODT, respectively. The following relations are satisfied: |TDT|=2.124% and |ODT|=5.076%.
In the optical image capturing system of the present embodiment, contrast transfer rates of modulation transfer with spatial frequencies of 55 cycles/mm of a visible light at the optical axis on the image plane, 0.3 HOI and 0.7 HOI are respectively denoted by MTFE0, MTFE3 and MTFE7. The following relations are satisfied: MTFE0 is about 0.84, MTFE3 is about 0.84 and MTFE7 is about 0.75. The contrast transfer rates of modulation transfer with spatial frequencies of 110 cycles/mm of a visible light at the optical axis on the image plane, 0.3 HOI and 0.7 HOI are respectively denoted by MTFQ0, MTFQ3 and MTFQ7. The following relations are satisfied: MTFQ0 is about 0.66, MTFQ3 is about 0.65 and MTFQ7 is about 0.51. The contrast transfer rates of modulation transfer with spatial frequencies of 220 cycles/mm (MTF values) at the optical axis on the image plane, 0.3 HOI and 0.7 HOI are respectively denoted by MTFH0, MTFH3 and MTFH7. The following relations are satisfied: MTFH0 is about 0.17, MTFH3 is about 0.07 and MTFH7 is about 0.14.
In the optical image capturing system of the present embodiment, when the infrared wavelength 850 nm is applied to focus on the image plane, contrast transfer rates of modulation transfer with a spatial frequency (55 cycles/mm) (MTF values) of the image at the optical axis on the image plane, 0.3 HOI and 0.7 HOI are respectively denoted by MTFI0, MTFI3 and MTFI7. The following relations are satisfied: MTFI0 is about 0.81, MTFI3 is about 0.8 and MTFI7 is about 0.15.
Please refer to the following Table 1 and Table 2.
The detailed data of the optical image capturing system of the first embodiment is as shown in Table 1.
As for the parameters of the aspheric surfaces of the first embodiment, reference is made to Table 2.
Table 1 is the detailed structure data to the first embodiment in
Please refer to
The first lens element 210 has negative refractive power and it is made of glass material. The first lens element 210 has a convex object-side surface 212 and a concave image-side surface 214, and both of the object-side surface 212 and the image-side surface 214 are aspheric.
The second lens element 220 has negative refractive power and it is made of glass material. The second lens element 220 has a concave object-side surface 222 and a concave image-side surface 224, and both of the object-side surface 222 and the image-side surface 224 are aspheric.
The third lens element 230 has positive refractive power and it is made of glass material. The third lens element 230 has a convex object-side surface 232 and a convex image-side surface 234, and both of the object-side surface 232 and the image-side surface 234 are aspheric.
The fourth lens element 240 has positive refractive power and it is made of glass material. The fourth lens element 240 has a convex object-side surface 242 and a convex image-side surface 244, and both of the object-side surface 242 and the image-side surface 244 are aspheric.
The fifth lens element 250 has negative refractive power and it is made of glass material. The fifth lens element 250 has a concave object-side surface 252 and as convex image-side surface 254, and both of the object-side surface 252 and the image-side surface 254 are aspheric.
The sixth lens element 260 has positive refractive power and it is made of glass material. The sixth lens element 260 has a convex object-side surface 262 and a convex image-side surface 264. Hereby, the back focal length is reduced to miniaturize the lens element effectively. In addition, the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The IR-bandstop filter 280 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 260 and the image plane 290.
In the optical image capturing system of the second embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relations are satisfied: ΣPP=21.726 mm and f3/ΣPP=0.321. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the second embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣNP=−22.398 mm and f1/ΣNP=0.533. Hereby, it is favorable for allocating the negative refractive power of a single lens element to other negative lens elements.
Please refer to the following Table 3 and Table 4.
The detailed data of the optical image capturing system of the second embodiment is as shown in Table 3.
As for the parameters of the aspheric surfaces of the second embodiment, reference is made to Table 4.
In the second embodiment, the presentation or the aspheric surface formula is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment, so the repetitious details will not be given here.
The following contents may be deduced from Table 3 and Table 4.
Please refer to
The first lens element 310 has negative refractive power and it is made of glass material. The first lens element 310 has a convex object-side surface 312 and a concave image-side surface 314, and both of the object-side surface 312 and the image-side surface 314 are aspheric.
The second lens element 320 has negative refractive power and it is made of glass material. The second lens element 320 has a convex object-side surface 322 and a concave image-side surface 324, and both of the object-side surface 322 and the in surface 324 are aspheric
The third lens element 330 has positive refractive power and it is made of glass material. The third lens element 330 has a convex object-side surface 332 and a concave image-side surface 334, and both of the object-side surface 332 and the image-side surface 334 are aspheric.
The fourth lens element 340 has positive refractive power and it is made of glass material. The fourth lens element 340 has a convex object-side surface 342 and a convex image-side surface 344, and both of the object-side surface 342 and the image-side surface 344 are aspheric.
The fifth lens element 350 has negative refractive power and it is made of glass material. The fifth lens element 350 has a concave object-side surface 352 and a convex image-side surface 354, and both of the object-side surface 352 and the image-side surface 354 are aspheric.
The sixth lens element 360 has positive refractive power and it is made of glass material. The sixth lens element 360 has a convex object-side surface 362 and a convex image-side surface 364. Hereby, the back focal length is reduced to miniaturize the lens element effectively. In addition, the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The IR-bandstop filter 380 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 360 and the image plane 390.
In the optical image capturing system of the third embodiment, a sum of focal lengths of all lens elements with positive refractive, power is ΣPP. The following relation is satisfied: ΣPP=23.704 mm and f3/ΣPP=0.374. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the third embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣNP=−24.917 mm and f1/ΣNP=0.483. Hereby, it is favorable for allocating the negative refractive power of a single lens element to other negative lens elements.
Please refer to the following Table 5 and Table 6.
The detailed data of the optical image capturing system of the third embodiment is as shown in Table 5.
As for the parameters of the aspheric surfaces of the third embodiment, reference is made to Table 6.
The presentation of the aspheric surface formula in the third embodiment is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment so the repetitious details will not be given here.
The following contents may be deduced from Table 5 and Table 6.
Please refer to
The first lens element 410 has negative refractive power and it is made of glass material. The first lens element 410 has a convex object-side surface 412 and a concave image-side surface 414, and both of the object-side surface 412 and the image-side surface 414 are aspheric.
The second lens element 420 has negative refractive power and it is made of glass material. The second lens element 420 has a convex object-side surface 422 and as concave image-side surface 424, and both of the object-side surface 422 and the image-side surface 424 are aspheric.
The third lens element 430 has positive refractive power and it is made of glass material. The third lens element 430 has a convex object-side surface 432 and as convex image-side surface 434, and both of the object-side surface 432 and the image-side surface 434 are aspheric.
The fourth lens element 440 has positive refractive power and it is made of glass material. The fourth lens element 440 has a convex object-side surface 442 and a convex image-side surface 444, and both of the object-side surface 442 and the image-side surface 444 are aspheric.
The fifth lens element 450 has negative refractive power and it is made of glass material. The fifth lens element 450 has a concave object-side surface 452 and a convex image-side surface 454, and both of the object-side surface 452 and the image-side surface 454 are aspheric.
The sixth lens element 460 has positive refractive power and it is made of glass material. The sixth lens element 460 has a convex object-side surface 462 and a convex image-side surface 464. Hereby, the back focal length is reduced to miniaturize the lens element effectively. In addition, the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The IR-bandstop filter 480 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 460 and the image plane 490.
In the optical image capturing system of the fourth embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relation is satisfied: ΣPP=22.843 mm and f3/ΣPP=0.320. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the fourth embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣNP=−24.815 mm and f1/ΣNP0.433. Hereby, it is favorable for allocating the negative refractive power of to single lens element to other negative lens elements.
Please refer to the following Table 7 and Table 8.
The detailed data of the optical image capturing system of the fourth embodiment is as shown in Table 7.
As for the parameters of the aspheric surfaces of the fourth embodiment, reference is made to Table 8.
The presentation of the aspheric surface formula in the fourth embodiment is similar to that in the first embodiment. Besides the definitions of parameters in following tables are equal to those in the first embodiment so the repetitious details will not be given here.
The following contents may be deduced from Table 7 and Table 8.
Please refer to
The first lens element 510 has negative refractive power and it is made of glass material. The first lens element 510 has a convex object-side surface 512 and a concave image-side surface 514, and both of the object-side surface 512 and the image-side surface 514 are aspheric.
The second lens element 520 has negative refractive power and it is made of glass material. The second lens element 520 has a convex object-side surface 522 and a concave image-side surface 524, and both of the object-side surface 522 and the image-side surface 524 are aspheric.
The third lens element 530 has positive refractive power and it is made of glass material. The third lens element 530 has a convex object-side surface 532 and a concave image-side surface 534, and both of the object-side surface 532 and the image-side surface 534 are aspheric.
The fourth lens element 540 has positive refractive power and it is made of glass material. The fourth lens element has a convex object-side surface 542 and a convex image-side surface 544, and both of the object-side surface 542 and the image-side surface 544 are aspheric.
The fifth lens element 550 has negative refractive power and it is made of glass material. The fifth lens element 550 has a concave object-side surface 552 and a convex image-side surface 554, and both of the object-side surface 552 and the image-side surface 554 are aspheric.
The sixth lens element 560 has positive refractive power and it is made of glass material. The sixth lens element 560 has a convex object-side surface 562 and a convex image-side surface 564. Hereby, the back focal length is reduced to miniaturize the lens element effectively. In addition, the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The IR-bandstop filter 580 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 560 and the image plane 590.
In the optical image capturing system of the fifth embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relation is satisfied: ΣPP=25.096 mm and f3/ΣPP=0356. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the fifth embodiment, sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ρNP=−22.710 mm and f1/ΣNP=0.484. Hereby, it is favorable for allocating the negative refractive power of a single lens element to other negative lens elements.
Please refer to the following Table 9 and Table 10.
The detailed data of the optical image capturing system of the fifth embodiment is as shown in Table 9.
As for the parameters of the aspheric surfaces of the fifth embodiment, reference is made to Table 10.
The presentation of the aspheric surface formula in the fifth embodiment is similar to that in the first embodiment. Besides the definitions of parameters in following tables are equal to those in the first embodiment so the repetitious details will not be given here.
The following contents may be deduced from Table 9 and Table 10.
Please refer to
The first lens element 610 has negative refractive power and it is made of glass material. The first lens element 610 has a convex object-side surface 612 and a concave image-side surface 614, and both of the object-side surface 612 and the image-side surface 614 are aspheric.
The second lens element 620 has negative refractive power and it is made of glass material. The second lens element 620 has a convex object-side surface 622 and a concave image-side surface 624, and both of the object-side surface 622 and the image-side surface 624 are aspheric.
The third lens element 630 has positive refractive power and it is made of glass material. The third lens element 630 has a convex object-side surface 632 and a concave image-side surface 634, and both of the object-side surface 632 and the image-side surface 634 are aspheric.
The fourth lens element 640 has positive refractive power and it is made of glass material. The fourth lens element 640 has a convex object-side surface 642 and a convex image-side surface 644, and both of the object-side surface 642 and the image-side surface 644 are aspheric.
The fifth lens element 650 has positive refractive power and it is made of glass material. The fifth lens element 650 has a convex object-side surface 652 and a convex image-side surface 654, and both of the object-side surface 652 and the image-side surface 654 are aspheric.
The sixth lens element 660 has negative refractive power and it is made of glass material. The sixth lens element 660 has a concave object-side surface 662 and a convex image-side surface 664. Hereby, the back focal length is reduced to miniaturize the lens element effectively. In addition, the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The IR-bandstop filter 680 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 660 and the image plane 690.
In the optical image capturing system of the sixth Embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relations are satisfied: ΣPP=31.888 mm and f3/ΣPP=0.650. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the sixth Embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relations are satisfied: ΣNP=−29.019 mm and f1/ΣNP=0.220. Hereby, it is favorable for allocating the negative refractive power of a single lens element to other negative lens elements.
Please refer to the following Table 11 and Table 12.
The detailed data of the optical image capturing system of the sixth Embodiment is as shown in Table 11.
As for the parameters of the aspheric surfaces of the sixth Embodiment, reference is made to Table 12.
In the sixth Embodiment, the presentation of the aspheric surface formula is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment, so the repetitious details will not be given here.
The following contents may be deduced from Table 11 and Table 12.
Please refer to
The first lens element 710 has negative refractive power and it is made of glass material. The first lens element 710 has a convex object-side surface 712 and a concave image-side surface 714, and both of the object-side surface 712 and the image-side surface 714 are aspheric.
The second lens element 720 has negative refractive power and it is made of glass material. The second lens element 720 has a convex object-side surface 722 and a concave image-side surface 724, and both of the object-side surface 722 and the image-side surface 724 are aspheric.
The third lens element 730 has positive refractive power and it is made of glass material. The third lens element 730 has a convex object-side surface 732 and a concave image-side surface 734, and both of the object-side surface 732 and the image-side surface 734 are aspheric.
The fourth lens element 740 has positive refractive power and it is made of glass material. The fourth lens element 740 has a convex object-side surface 742 and a convex image-side surface 744, and both of the object-side surface 742 and the image-side surface 744 are aspheric.
The fifth lens element 750 has positive refractive power and it is made of glass material. The fifth lens element 750 has a convex object-side surface 752 and a convex image-side surface 754, and both of the object-side surface 752 and the image-side surface 754 are aspheric.
The sixth lens element 760 has negative refractive power and it is made of glass material. The sixth lens element 760 has a concave object-side surface 762 and a convex image-side surface 764. Hereby, the back focal length is reduced to miniaturize the lens element effectively. In addition, the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The IR-bandstop filter 780 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 760 and the image plane 790.
In the optical image capturing system of the seventh Embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relations are satisfied: ΣPP=40.907 mm and f3/ΣPP=0.771. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the seventh Embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relations are satisfied: ΣNP=−26.903 mm and f1/ΣNP=0.237. Hereby, it is favorable for allocating the negative refractive power of a single lens element to other negative lens elements.
Please refer to the following Table 13 and Table 14.
The detailed data of the optical image capturing system of the seventh Embodiment is as shown in Table 13.
As for the parameters of the aspheric surfaces of the seventh Embodiment, reference is made to Table 14.
In the seventh Embodiment, the presentation of the aspheric surface formula is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment, so the repetitious details will not be given here.
The following contents may be deduced from Table 13 and Table 14.
Please refer to
The first lens element 810 has positive refractive power and it is made of plastic material. The first lens element 810 has a convex object-side surface 812 and a concave image-side surface 814, both of the object-side surface 812 and the image-side surface 814 are aspheric, and the image-side surface 814 has an inflection point.
The second lens element 820 has negative refractive power and it is made of plastic material. The second lens element 820 has a concave object-side surface 822 and a concave image-side surface 824, and both of the object-side surface 822 and the image-side surface 824 are aspheric. The image-side surface 824 has two inflection points.
The third lens element 830 has negative refractive power and it is made of plastic material. The third lens element 830 has a convex object-side surface 832 and a concave image-side surface 834, and both of the object-side surface 832 and the image-side surface 834 are aspheric. The object-side surface 832 and the image-side surface 834 both have an inflection point.
The fourth lens element 840 has positive refractive power and it is made of plastic material. The fourth lens element 840 has a concave object-side surface 842 and a convex image-side surface 844, and both of the object-side surface 842 and the image-side surface 844 are aspheric. The object-side surface 842 has three inflection points.
The fifth lens element 850 has positive refractive power and it is made of plastic material. The fifth lens element 850 has a convex object-side surface 852 and a convex image-side surface 854, and both of the object-side surface 852 and the image-side surface 854 are aspheric. The object-side surface 852 has three inflection points and the image-side surface 854 has an inflection point.
The sixth lens element 860 has negative refractive power and it is made of plastic material. The sixth lens element 860 has a concave object-side surface 862 and a concave image-side surface 864. The object-side surface 862 has two inflection points and the image-side surface 864 has an inflection point. Hereby, the back focal length is reduced to miniaturize the lens element effectively. In addition, the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The IR-bandstop filter 880 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the sixth lens element 860 and the image plane 890.
In the optical image capturing system of the eighth Embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relations are satisfied: ΣPP=12.785 mm and f5/ΣPP=0.10. Hereby, it is favorable for allocating the positive refractive power of a single lens element to other positive lens elements and the significant aberrations generated in the process of moving the incident light can he suppressed.
In the optical image capturing system of the eighth Embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relations are satisfied: ΣNR=−112.117 mm and f6/ΣENP=0.009. Hereby, it is favorable for allocating the negative refractive power of a single lens element to other negative lens elements.
Please refer to the following Table 15 and Table 16.
The detailed data of the optical image capturing system of the eighth Embodiment is as shown in Table 15.
As for the parameters of the aspheric surfaces of the eighth Embodiment, reference is made to Table 16.
In the eighth Embodiment, the presentation of the aspheric surface formula is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment, so the repetitious details will not be given here.
The following contents may be deduced from Table 15 and Table 16.
The following contents may be deduced from Table 15 and Table 16.
The above-mentioned descriptions represent merely the exemplary embodiment of the present disclosure, without any intention to limit the scope of the present disclosure thereto. Various equivalent changes, alternations or modifications based on the claims of present disclosure are all consequently viewed as being embraced by the scope of the present disclosure.
Claims
1. An optical image capturing system, from an object side to an image side, comprising:
- a first lens element with refractive power;
- a second lens element with refractive power;
- a third lens element with refractive power;
- a fourth lens element with refractive power;
- a fifth lens element with refractive power;
- a sixth lens element with refractive power; and
- an image plane;
- wherein the optical image capturing system consists of six lens elements with refractive power, a maximum height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, at least one of the first through sixth lens elements has positive refractive power, an object-side surface and an image-side surface of the sixth lens element are aspheric, focal lengths of the first through sixth lens elements are f1, f2, f3, f4, f5 and f6 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance on an optical axis from an axial point on a object-side surface of the first lens element to an axial point the image plane is HOS, thicknesses in parallel with an optical axis of the first through sixth lens elements at height ½ HEP respectively are ETP1, ETP2, ETP3, ETP4, ETP5 and ETP6, a sum of ETP1 to ETP6 described above is SETP, thicknesses of the first through sixth lens elements on the optical axis respectively are TP1, TP2, TP3, TP4, TP5 and TP6, a sum of TP1 to TP6 described above is STP, and the following relations are satisfied: 1.2≦f/HEP≦10.0 and 0.5≦SETP/STP<1.
2. The optical image capturing system of claim 1, wherein a horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to the image plane is ETL, a horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to a coordinate point on the image-side surface of the sixth lens element at height ½ REP is EIN, and the following relation is satisfied: 0.2≦EIN/ETL<1.
3. The optical image capturing system of claim 2, wherein the thicknesses in parallel with the optical axis of the first through sixth lens elements at height ½ HEP respectively are ETP1, ETP2, ETP3, ETP4, ETP5 and ETP6, the sum of ETP1 to ETP6 described above is SETP, and the following relation is satisfied: 0.3≦SETP/EIN<1.
4. The optical image capturing system of claim 1, wherein the optical image capturing system comprises a light filtration element, the light filtration element is located between the sixth lens element and the image plane, a distance in parallel with the optical axis from a coordinate point on the image-side surface of the sixth lens element at height ½ HEP to the light filtration element is EIR, a distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the light filtration element is PIR, and the following relation is satisfied: 0.1≦EIR/PIR≦1.1.
5. The optical image capturing system of claim 1, wherein at least one lens element of the six lens elements is made of glass material.
6. The optical image capturing system of claim 1, wherein contrast transfer rates of modulation transfer with space frequencies of 55 cycles/min (MTF values) of a visible light at the optical axis on the image plane, 0.3 HOI and 0.7 HOI are respectively denoted by MTFE0, MTFE3 and MTFE7, and the following relations are satisfied: MTFE0≧0.2, MTFE3≧0.01 and MTFE7≧0.01.
7. The optical image capturing system of claim 1, wherein a half of maximum view angle of the optical image capturing system is HAF, and the following relation is satisfied: 0.4≦|tan(HAF)|≦6.0.
8. The optical image capturing system of claim 1, wherein a horizontal distance in parallel with the optical axis from a coordinate point on the image-side surface of the sixth lens element at height ½ HEP to the image plane is EBL, a horizontal distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the image plane is BL, and the following relation is satisfied: 0.1≦EBL/BL<1.1.
9. The optical image capturing system of claim 1, further comprising an aperture stop, a distance from the aperture stop to the image plane on the optical axis is InS, an image sensing device is disposed on the image plane, and the following relations are satisfied: 0.1≦InS/HOS≦1.1 and 0≦HIF/HOI≦0.9.
10. An optical image capturing system, from an object side to an image side, comprising:
- a first lens element with negative refractive power;
- a second lens element with refractive power;
- a third lens element with refractive power;
- a fourth lens element with refractive power;
- a fifth lens element with refractive power;
- a sixth lens element with refractive power; and
- an image plane;
- wherein the optical image capturing system consists of six lens elements with refractive power and at least two of the six lens elements are made of glass material, a maximum height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, at least one of the second through sixth lens elements has positive refractive power, focal lengths of the first through sixth lens elements are f1, f2, f3, f4, f5 and f6 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance on an optical axis from an axial point on an object-side surface of the first lens element to an axial point on the image plane is HOS, a horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to the image plane is ETL, a horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to a coordinate point on the image-side surface of the sixth lens element at height ½ HEP is EIN, and the following relations are satisfied: 1.2≦f/HEP≦10.0 and 0.2≦EIN/ETL<1.
11. The optical image capturing system of claim 10, wherein a horizontal distance in parallel with the optical axis from a coordinate point on the image-side surface of the fifth lens element at height ½ HEP to a coordinate point on the object-side surface of the sixth lens element at height ½ HEP is ED56, a distance from the fifth lens element to the sixth lens element on the optical axis is IN56, and the following relation is satisfied: 0<ED56/IN56≦50.
12. The optical image capturing system of claim 10, wherein a horizontal distance in parallel with the optical axis from a coordinate point on the image-side surface of the first lens element at height ½ HEP to a coordinate point on the object-side surface of the second lens element at height ½ HEP is ED12, a distance from the first lens element to the second lens element on the optical axis is IN12, and the following relation is satisfied: 0<ED12/IN12<10.
13. The optical image capturing system of claim 10, wherein a thickness in parallel with the optical axis of the second lens element at height ½ HEP is ETP2, a thickness of the second lens element on the optical axis is TP2, and the following relation is satisfied: 0<ETP2/TP2≦3.
14. The optical image capturing system of claim 10, wherein a thickness in parallel with the optical axis of the fifth lens element at height ½ HEP is ETP5, a thickness of the fifth lens element on the optical axis is TP5, and the following relation is satisfied: 0<ETP5/TP5≦3.
15. The optical image capturing system of claim 10, wherein a thickness in parallel with the optical axis of the sixth lens element at height ½ HEP is ETP6, a thickness of the sixth lens element on the optical axis is TP6, and the following relation is satisfied: 0<ETP6/TP6≦5.
16. The optical image capturing system of claim 10, wherein a distance from the first lens element to the second lens element on the optical axis is IN12, and the following relation is satisfied: 0<IN12/f≦60.
17. The optical image capturing system of claim 10, wherein contrast transfer rates of modulation transfer with spatial frequencies of 55 cycles/mm of an infrared operation wavelength 850 nm at the optical axis on the image plane, 0.3 HOI and 0.7 HOI are respectively denoted by MTFI0, MTFI3 and MTFI7, and the following relations are satisfied: MTFI0≧0.01, MTFI3≧0.01 and MTFI7≧0.01.
18. The optical image capturing system of claim 10, wherein contrast transfer rates of modulation transfer with space frequencies of 110 cycles/mm of as visible light at the optical axis on the image plane, 0.3 HOI and 0.7 HOI are respectively denoted by MTFQ0, MTFQ3 and MTFQ7, and the following relations are satisfied: MTFQ0≧0.2, MTFQ3≧0.01 and MTFQ7≧0.01.
19. The optical image capturing system of claim 10, wherein at least one of the first, the second, the third, the fourth, the fifth and the sixth lens elements is a light filtration element with a wavelength of less than 500 nm.
20. An optical image capturing system, from an object side to an image side, comprising:
- a first lens element with negative refractive power;
- a second lens element with refractive power:
- a third lens element with refractive power;
- a fourth lens element with refractive power;
- a fifth lens element with positive refractive power;
- a sixth lens element with refractive power, and
- an image plane;
- wherein the optical image capturing system consists of six lens elements with refractive power and any one of the six lens elements is made of glass material, a maximum height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, focal lengths of the first through sixth lens elements are f1, f2, f3, f4, f5 and f6 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a half of maximum view angle of the optical image capturing system is HAF, a distance on an optical axis from an axial point on an object-side surface of the first lens element to an axial point on the image plane is HOS, a horizontal distance in parallel with the optical axis from a coordinate point on the object-side surface of the first lens element at height ½ HEP to the image plane is ETL, a horizontal distance in parallel with the optical axis from a coordinate point an the object-side surface of the first lens element at height ½ HEP to a coordinate point on the image-side surface of the sixth lens element at height ½ HEP is EIN, and the following relations are satisfied: 1.2≦f/HEP≦10.0, 0.4≦|tan(HAF)|≦6.0, and 0.2≦EIN/ETL<1.
21. The optical image capturing system of claim 20, wherein a horizontal distance in parallel with the optical axis from a coordinate point on the image-side surface of the sixth lens element at height ½ HEP to the image plane is EBL, a horizontal distance in parallel with the optical axis from an axial point on the image-side surface of the sixth lens element to the image plane is BL, and the following relation is satisfied: 0.1≦EBL/BL≦1.1.
22. The optical image capturing system of claim 21, wherein a horizontal distance in parallel with the optical axis from a coordinate point on the image-side surface of the fifth lens element at height ½ HEP to a coordinate point on the object-side surface of the sixth lens element at height ½ HEP is ED56, a distance from the fifth lens element to the sixth lens element on the optical axis is IN56, and the following relation is satisfied: 0<ED56/IN56≦50.
23. The optical image capturing system of claim 20, wherein a distance from the fifth lens element to the sixth lens element on the optical axis is IN56, and the following relation is satisfied: 0<IN56/f≦5.0.
24. The optical image capturing system of claim 23, wherein the optical image capturing system satisfies the following relation: 0 mm<HOS≦50 mm.
25. The optical image capturing system of claim 23, further comprising an aperture stop, an image sensing device and a driving module, the image sensing device is disposed on the image plane, a distance from the aperture stop to the image plane on the optical axis is InS, the driving module and the six lens elements couple to each other and shifts are produced for the six lens elements, and the following relation is satisfied: 0.1≦InS/HOS≦1.1.
Type: Application
Filed: Dec 18, 2015
Publication Date: Mar 2, 2017
Inventors: YAO-WEI LIU (TAICHUNG CITY), YEONG-MING CHANG (TAICHUNG CITY)
Application Number: 14/974,716
