Abstract: A camera optical lens is provided, including from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, the camera optical lens satisfies following conditions: ?2.80?f1/f??1.20; 1.20?d9/d11?1.90; 1.20?(R7+R8)/(R7?R8)?5.00; 0.70?f2/f?1.00, where f denotes focal length of the camera optical lens; f1 denotes focal length of the first lens; f2 denotes focal length of the second lens; R7 denotes curvature radius of object side surface of the fourth lens; R8 denotes curvature radius of image side surface of the fourth lens; d9 denotes on-axis thickness of the fifth lens; d11 denotes on-axis thickness of the sixth lens. The above camera optical lens can meet design requirements for large aperture, wide angle and ultra-thinness, while maintaining good imaging quality.

Abstract: A photographing optical lens assembly includes eight lens elements, the eight lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. Each of the eight lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side. At least one surface of the object-side surface and the image-side surface of at least one lens element of the photographing optical lens assembly is aspheric and includes at least one inflection point.

Abstract: An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, and a second lens unit having a positive refractive power. An interval between the first lens unit and the second lens unit changes during focusing. The second lens unit includes, in order from the object side to the image side, a first subunit having a positive refractive power, an aperture stop, and a second subunit having a positive refractive power. A predetermined condition is satisfied.

Abstract: Disclosed is an ultra-thin composite transparent conductive film, comprising: a transparent substrate; a first UV glue layer disposed on one side of the transparent substrate, pattern-imprinted and cured to form a first grid-shaped groove and a first lead groove, the first grid-shaped groove and the first lead groove being filled with conductive materials to form a first conductive layer and a first lead region respectively, depth of the first grid-shaped groove and the first lead groove being smaller than a thickness of the first UV glue layer; a second UV glue layer disposed on one side of the first UV glue layer away from the transparent substrate and used as a reinforced insulating support layer; and a third UV glue layer disposed on one side of the second UV glue layer away from the transparent substrate, pattern-imprinted and cured to form a second grid-shaped groove and a second lead groove, the second grid-shaped groove and the second lead groove being filled with conductive materials to form a second

Abstract: The present disclosure discloses an optical imaging lens assembly, and the optical imaging lens assembly includes, sequentially from an object side to an image side along an optical axis: a first lens having positive refractive power, and at least one subsequent lens having refractive power. An F-number Fno1 of the optical imaging lens assembly satisfies Fno1>3.5, where an object distance is finite, and an F-number Fno2 of the optical imaging lens assembly satisfies Fno2?1.0, where the object distance is infinite.

Abstract: An image sensor may include a photoelectric device configured to selectively absorb light associated with a first color of three primary colors, a semiconductor substrate stacked with the photoelectric device and including first and second photo-sensing devices configured to sense light associated with second and third colors of the three primary colors, respectively, a first color filter corresponding to the first photo-sensing device and configured to selectively transmit light of the first wavelength spectrum, a second color filter corresponding to the second photo-sensing device and configured to selectively transmit light associated with a mixed color of the first color and the third color, and a first insulating layer between the photoelectric device and the semiconductor substrate and corresponding to the second photo-sensing device, and configured to selectively reflect light of a part of visible light.

Abstract: There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power having an object-side surface being convex in a paraxial region, a second lens with negative refractive power having an object-side surface being convex in a paraxial region, a third lens with negative refractive power in a paraxial region, a fourth lens, and a fifth lens having an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.

Abstract: An imaging optical lens assembly includes an aperture stop and a plurality of lens elements. The aperture stop has a fixed elliptical shape, and the aperture stop has a major axis and a minor axis.

Abstract: An endoscope includes a shaft having a distal end, an optical imaging device at the distal end of the shaft for producing a real image of an object observed by means of the endoscope and at least one of an image transfer device for transmitting the real image and an image sensor for capturing the real image. The imaging device has curved light-refracting interfaces, which are tilted in relation to one another.

Abstract: The present disclosure relates to the technical field of optical lens and discloses a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens and a sixth lens. The camera optical lens satisfies following conditions: 1.00?f1/f?20.00; and 30.00?R1/d1?55.00; f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; R1 denotes a curvature radius of an object-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens. The camera optical lens can achieve a high imaging performance while obtaining a low TTL.

Abstract: The present disclosure relates to the technical field of optical lens and discloses a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The camera optical lens satisfies following conditions: 1.51?f1/f?2.50, 1.70?n2?2.20, ?2.00?f3/f4?1.80, ?10.00?(R13+R14)/(R13?R14)?10.00 and 1.70?n4?2.20, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; f4 denotes a focal length of the fourth lens; n2 denotes a refractive index of the second lens; n4 denotes a refractive index of the fourth lens L4; R13 denotes a curvature radius of an object-side surface of the seventh lens; and R14 denotes a curvature radius of an image-side surface of the seventh lens.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens having a convex image-side surface, a sixth lens, and a seventh lens disposed in order from an object side, and a distance from the image-side surface of the fifth lens to an object-side surface of the sixth lens is shorter than a distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens.

Abstract: A light based skin treatment device comprises a laser light source for providing a pulsed incident light beam for treating skin by laser induced optical breakdown of hair or skin tissue. In one arrangement, a focusing system has a pre-focusing lens for increasing the convergence of the an incident light beam and a skin contact lens having convex light input and light exit surfaces. The focal spot position is controlled by adjusting a spacing between the pre-focusing lens and the skin contact lens. In another arrangement, there is an adjustable lens system before an adjustable focusing system for providing compensation for aberration in the adjustable focusing system.

Abstract: An image sensor may include a photoelectric device configured to selectively absorb light associated with a first color of three primary colors, a semiconductor substrate stacked with the photoelectric device and including first and second photo-sensing devices configured to sense light associated with second and third colors of the three primary colors, respectively, a first color filter corresponding to the first photo-sensing device and configured to selectively transmit light of the first wavelength spectrum, a second color filter corresponding to the second photo-sensing device and configured to selectively transmit light associated with a mixed color of the first color and the third color, and a first insulating layer between the photoelectric device and the semiconductor substrate and corresponding to the second photo-sensing device, and configured to selectively reflect light of a part of visible light.

Abstract: The present invention relates to optical imaging systems which are able to provide increased depth of field to microscope devices, motion-picture cameras, and still photographic cameras. Optical systems described herein are able to provide the increased depth of field while maintaining wide field of view and reducing spherical aberration and distortion. Optical systems described herein are also able to be used with standard film and digital sensor formats, and are able to be attached to, or integrated with, photographic and motion-picture cameras, including currently existing cameras.

Abstract: Provided are an eyepiece and a head-mounted display device, where the eyepiece includes: a positive lens and a negative lens arranged sequentially and coaxially; where a light incident surface of the positive lens is a planar Fresnel surface, and a light emergent surface of the positive lens is a convex surface; a light incident surface of the negative lens is a concave surface, and a light emergent surface of the negative lens is a convex surface; and the light to be observed is incident on the light incident surface of the negative lens and refracted by the negative lens to the light incident surface of the positive lens, and enters human eyes after being refracted by the positive lens. The eyepiece and head-mounted display device provided by the present disclosure realize an ultrathin eyepiece optical system and facilitate a miniaturized and lighter head-mounted display device.

Abstract: An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point. The optical imaging lens assembly has a total of six lens elements.

Abstract: A technical concept of the present invention provides: a curved pattern marker capable of improving the precision of position detection and reducing size; and an optical tracking device including the marker. The marker comprises: a first lens unit, which has at least one lens having an incident surface, emits incident light within a target range, and is formed such that a light parallel to an optical axis among the incident light is vertically incident on the incident surface; a pattern unit having a curved pattern formed therein; and a second lens unit arranged between the first lens unit and the pattern unit, and adjusting the light emitted from the first lens unit such that the light is focused on the curved pattern.

Abstract: A wide angle lens assembly (1) for a camera. The assembly comprises a first group (2) and a second group (3) of lenses. The first group (2) is adapted to be arranged closer to an iris of the camera than the second (3) group. The first group (2) comprises multiple, preferably five, lenses with a negative refractivity and the second group (3) comprises at least three, preferably cemented, lenses (5) and at least one aspherical lens (6). The first group (2) comprises one aspherical lens (7) spaced furthest from the other lenses of the first group (2) and adapted to be arranged further away from the iris than the other lenses of the first group (2).

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens having negative refractive power. The second lens group includes a fourth lens having positive refractive power, a fifth lens, and a sixth lens. The first lens has a convex surface facing the image plane side near an optical axis thereof. The third lens has a concave surface facing the image plane side near an optical axis thereof. The fourth lens has a convex surface facing the image plane side near an optical axis thereof. The fourth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a fourth lens, a fifth lens having negative refractive power, and a sixth lens. The third lens has a concave surface facing the image plane side near an optical axis thereof. The fourth lens has a convex surface facing the image plane side near an optical axis thereof. The sixth lens has a concave surface facing the object side near an optical axis thereof. The fourth lens has a specific Abbe's number. The fifth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens group and a second lens group having negative refractive power, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a fourth lens having positive refractive power, a fifth lens, and a sixth lens. The second lens has a concave surface facing the object side near an optical axis thereof. The third lens has a concave surface facing the image plane side near an optical axis thereof. The sixth lens has a concave surface facing the object side near an optical axis thereof. The fourth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens having negative refractive power. The second lens group includes a fourth lens having positive refractive power, a fifth lens, and a sixth lens. The third lens has a concave surface facing the image plane side near an optical axis thereof. The fifth lens has a concave surface facing the image plane side near an optical axis thereof. The fourth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens having negative refractive power. The second lens group includes a fourth lens, a fifth lens, and a sixth lens. The third lens has a concave surface facing the image plane side near an optical axis thereof. The fifth lens has a concave surface facing the image plane side near an optical axis thereof. The fourth lens has a specific Abbe's number. The fifth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens having negative refractive power. The second lens group includes a fourth lens, a fifth lens having negative refractive power, and a sixth lens having negative refractive power. The fourth lens has a specific Abbe's number. The fifth lens has a specific Abbe's number.

Abstract: A compact optical lens system includes, in order from the object side to the image side: a flat panel assembly made of glass, a first lens element with a negative refractive power, at least one of an object-side surface and an image-side surface of the first lens element being aspheric, a stop; and a second lens element with a positive refractive power having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the second lens element being aspheric. Such a system can not only effectively collect light at a large angle, receive a wider range of images and achieve identification effects within very short distances, but also can reduce the distance between an object and the compact optical lens system, reduce the volume effectively and maintain its miniaturization.

Abstract: An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point. The optical imaging lens assembly has a total of six lens elements.

Abstract: An objective optical system for an endoscope consists of a front group, an aperture stop, and a positive rear group in order from an object side. The front group consists of a negative first lens having a smaller absolute value of a curvature radius of a lens surface on an image side than that on an object side, and one or more parallel planar members of which an incidence surface and an emission surface are perpendicular to an optical axis, in order from the object side. The rear group consists of a positive second lens and a cemented lens in which a negative third lens, and a positive fourth lens are joined together in order from the object side and a cemented surface has a concave surface toward the image side. A predetermined conditional expression is satisfied.

Abstract: Present embodiments provide for optical imaging lenses. An optical imaging lens may comprise six lens elements positioned sequentially from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics, the total length of the optical imaging lens may be shortened and the performance of athermalization may be improved.

Abstract: The present disclosure provides for various embodiments of optical imaging lenses. An optical imaging lens may comprise six lens elements positioned in an order from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements, the optical imaging lens may provide great view angle and proper length of the optical imaging lens and improve the imaging quality.

Abstract: The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of plastic material, and the sixth lens is made of glass material. The camera optical lens further satisfies specific conditions.

Abstract: An electronic apparatus includes an imaging device and a signal processing circuit for performing signal processing on an output signal of the imaging device. The imaging device includes one group of lenses, and an imaging element on which an image is formed through the lenses, and the lenses include a first lens having an object side surface in a convex shape projecting to an object side, a transparent body, and a second lens, the first lens, the transparent body, and the second lens being arranged in order from the object side to an image surface side without an air being interposed between the first lens, the transparent body, and the second lens, and the imaging element is curved so as to have a concave surface facing the object side.

Abstract: The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens and a sixth lens. The first lens is made of plastic material, the second lens is made of glass material, the third lens is made of glass material, the fourth lens is made of plastic material, the fifth lens is made of plastic material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: A projection lens system which is arranged between an object side at which a micro-display panel is located and an image side at which a screen is located, and includes an aperture stop; a front lens group arranged at an object-side of the aperture stop and having a positive refractive power; a rear lens group arranged at an image-side of the aperture stop, the rear lens group including a first aspherical lens at a position closest to the image side and a second aspherical lens adjacent to an object-side surface of the first aspherical lens; and an aspherical mirror having a negative refractive power and reflecting light coming from the rear lens group toward the image side.

Abstract: A single focal length lens system which, in order from an object side to an image side, includes a first unit, an aperture diaphragm, and a second unit is provided. The second unit includes a cemented lens having positive optical power, and a joint surface of the cemented lens is an aspheric surface. The cemented lens satisfies a condition: |dn/dt1|MAX?2.67×10?5 (|dn/dt1|MAX: A Maximum Value of Absolute Values of Relative Refractive Index temperature coefficients in an atmosphere at 0 to 20° C. with respect to light having a wavelength range of 580 to 640 nm, which is calculated for each of lens elements constituting the cemented lens).

Abstract: An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point. The to optical imaging lens assembly has a total of six lens elements.

Abstract: A camera lens includes an open aperture; and a falcate first lens having a positive refractive power with a convex surface toward an imaging surface side. The camera lens satisfies specific conditions.

Abstract: A projection lens is applied to image projection of a projection device including an imaging unit. The projection lens includes a first lens group with a negative diopter and a second lens group with a positive diopter. The first lens group has a first lens having a first negative diopter. The second lens group is adjacent to the imaging unit and includes second, third, fourth, and fifth lenses. The second lens has a second negative diopter. The third and fourth lenses are between the first and second lenses. The fifth lens is between the imaging unit and the second lens and is an aspherical lens. A refractive index of the first lens is less than or equal to 1.64. An ABBE number of the first lens represents Vd1, an ABBE number of the second lens represents Vd2, 0.4?Vd2/Vd1?1.2, and Vd1<50.

Abstract: The invention relates to a camera modeling and calibration system and method using a new set of variables to compensate for imperfections in line of sight axis squareness with camera plane and which increases accuracy in measuring distortion introduced by image curvature caused by geometric and chromatic lens distortion and wherein the camera image plane is represented from a full 3D perspective projection.

Abstract: A wide-angle projection system includes a refraction unit and a reflection unit. The refraction unit includes a first lens group of positive refractive power and a second lens group of negative refractive power. The second lens group is disposed between the first lens group and the reflection unit and the condition: 0.9<A/B<1.4 is satisfied, where A denotes a distance along an optical axis of the wide-angle projection system and between the refraction unit and the reflection unit, and B denotes a total length of the refraction unit along the optical axis.

Abstract: A lens assembly for biologic characteristic identification is provided in the present disclosure. The lens assembly includes a first lens with positive refractive power and a second lens with negative refractive power, arranged in sequence from the object side to the image side and satisfy conditions: ?0.95?f1/f2??0.68; 0.10?d1/f?0.20; 0.24?d2/f?0.50; ?3.50?(R1+R2)/(R1?R2)??1.80; f is the focal length of the lens assembly, f1 and f2 is the focal lengths of the first lens and the second lens, d1 and d2 is the central thickness of the first lens and the axial distance from the image side of the first lens to the object side of the second lens, R1 and R2 is the curvature radius of the object side and the image side of the first lens.

Abstract: High-efficiency line-forming optical systems and methods for defect annealing and dopant activation are disclosed. The system includes a CO2-based line-forming system configured to form at a wafer surface a first line image having between 2000 W and 3000 W of optical power. The line image is scanned over the wafer surface to locally raise the temperature up to a defect anneal temperature. The system can include a visible-wavelength diode-based line-forming system that forms a second line image that can scan with the first line image to locally raise the wafer surface temperature from the defect anneal temperature to a spike anneal temperature. Use of the visible wavelength for the spike annealing reduces adverse pattern effects and improves temperature uniformity and thus annealing uniformity.

Abstract: Provided are a non-dyadic lens distortion correction method and an apparatus thereof. The non-dyadic lens distortion correction method includes: (a) acquiring a non-dyadic lens image photographed through a non-dyadic lens; (b) correcting geometric distortion for the non-dyadic lens image by stage by applying a magnification ratio based on a projection model; and (c) compensating a high-frequency component of an image corrected in a previous step by the patch unit in the non-dyadic lens image of which the geometric distortion is corrected.

Abstract: A two-piece optical lens for capturing image and a two-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 positive refractive power; and a second lens with refractive power; and at least one of the image-side surface and object-side surface of each of the two lens elements are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

Abstract: An optical lens includes a first lens group and a second lens group. The first lens group is disposed between a magnified side and a minified side and has a negative refractive power. The second lens group is disposed between the first lens group and the minified side and has a positive refractive power. The optical lens is capable of forming an image at the magnified side. F/H>0.52, where F is an effective focal length, and H is an image height. A viewing angle is greater than 116.7 degrees.

Abstract: A two-piece optical lens for capturing image and a two-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 positive refractive power; and a second lens with refractive power; and at least one of the image-side surface and object-side surface of each of the two lens elements are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

Abstract: An optical system includes, in order from object side: a positive first lens unit; and a positive second lens unit moving during focusing. The second lens unit includes, in order from object side, a front unit, an aperture stop, and a positive rear unit. The first unit includes a negative lens that has a convex surface facing object side and is arranged closest to object side, and three or more positive lenses on image side of the negative lens. A distance, on optical axis, from a lens surface on object side of a second positive lens counted from image side of the three or more positive lenses to a lens surface closest to image side of the first unit, and a distance, on optical axis, between a lens surface closest to object side and that closest to image side of the first unit are each appropriately set.

Abstract: A lens module (10) for image capture comprises a first positive meniscus lens (16) having a focal length F1 and comprising a first convex optical surface (18) facing the object side (12), and a second concave optical surface (20) facing the image side (14), and a second positive meniscus lens (22) having a focal length F2 and comprising a third concave optical surface (24) facing the object side (12), and a fourth convex optical surface (26) facing the image side (14). The four surfaces follow the equations: Zi=CURViYi2/(1+(1?(1?Ki)CURVi2Yi2)1/2)+(Ai)Yi2+(Bi)Yi4+(Ci)Yi6+(Di)Yi8 and Mi=1?(1+Ki)(CURVi)2(Ri)2 wherein: i is the surface number, Ki is the conic constant of the i-th surface, CURVi is the curvature of the i-th surface at the optical axis, Ai, Bi, Ci, and Di are aspheric coefficients of the i-th surface, and Ri is the effective radius of the aperture of the i-th surface. The following relations can be satisfied: 0.70<F1/F2<1.30 5<M2/M1<15.

Abstract: An optical lens is configured in front of an image-capturing lens of an image-capturing device. A light-emitting unit of the image-capturing device emits a light beam. The optical lens includes a pair of peripheral compensation portions and a central diverging portion. Each peripheral compensation portion has a first convex surface and a first concave surface arranged opposite to the first convex surface. The central diverging portion is arranged between the peripheral compensation portions, and has a second concave surface and an oppositely arranged light incident surface. The second concave surface is arranged between the first convex surfaces. The light incident surface is arranged between the first concave surfaces. The optical axis of the light beam sequentially aligns with the light incident surface and the second concave surface. The light rays of the light beam pass through the first concave surface and the first convex surface in sequence.

Abstract: Imaging lens comprises, in order from the object side, a first lens block having a convex and concave surfaces oriented toward the object and image side respectively, and having a positive power, and a second lens. An aperture stop can be located on the object side of the first lens block, a peripheral portion of the image side surface of the second lens has a positive power where: 0.62<fla/f<0.82 (1) ?4.00<flb/f<?1.11 (2) 0.70<D4/f<1.00 (3) with, fla: focal distance of object side lens portion of the first lens block; flb: focal distance of an image side lens portion of the first lens block; D4: distance on the optical axis from the object side surface of the first lens block to the image side surface of the second lens; f: focal distance of the imaging lens total system.