Abstract: A five-piece optical lens for capturing image and a five-piece optical module for capturing image, along the optical axis in order from an object side to an image side, include a first lens with positive refractive power, wherein an object-side surface thereof can be convex; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; and a fifth lens with negative refractive power, wherein an image-side surface can be concave, and at least one surface of the fifth lens has an inflection point; both surfaces of each of the five lenses are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.

Abstract: Techniques are disclosed for providing an optical assembly to provide stereoscopic images of a reflected laser spot to a camera for wind measurement. According to certain embodiments of the invention, an optical assembly can include left and right (or first and second) subassemblies having lens groups and reflective elements that cause light traveling left and right subassemblies to follow similar paths to focus on respective left and right portions of a camera. The camera can then use left and right images of reflected laser light to determine wind based on turbulence patterns in the left and right images.

Abstract: An image pick-up apparatus includes an imaging optical system including a plurality of lenses and a diaphragm arranged between the lenses, the imaging optical system forming an image on an image surface; and an image sensor that detects the image formed on the image surface. The imaging optical system includes a front lens group on an object side with respect to the diaphragm, and a rear lens group on the image surface side with respect to the diaphragm. A lens surface having the highest power in the front lens group and a lens surface having the highest power in the rear lens group are concentric surfaces. The front lens group includes a plano-concave lens whose light-exiting-side surface has a concave surface and whose light-incident-side surface has power ?r that satisfies the following expression: - 0.05 ? ? ? ? r ? ? ? o ? 0.05 where ?o is the power of the entire imaging optical system.

Abstract: An infrared imaging optical system for focusing infrared radiation on an infrared detector, including: a front lens group having a negative optical power to receive infrared radiation and including a first front lens and a second front lens each with at least one aspherical surface; an intermediate lens group that receives the infrared radiation from the front lens group and includes a first intermediate lens, a second intermediate lens, and a third intermediate lens each with at least one aspherical surface; and a rear lens group having positive optical power, wherein the rear lens group receives the infrared radiation from the intermediate lens group and includes a first rear lens and a second rear lens each with at least one aspherical surface, and a third rear lens, wherein the imaging optical system has a stop between the rear lens group and a focal plane at said infrared detector.

Abstract: An imaging lens for use with an operational waveband over any subset of 7.5-13.5 ?m may include a first optical element of a first high-index material and a second optical element of a second high-index material. At least two surfaces of the first and second optical elements may be optically powered surfaces. A largest clear aperture of all optically powered surfaces may not exceed a diameter of an image circle of the imaging lens corresponding to a field of view of 55 degrees or greater by more than 30%. The first and second high-index materials may have a refractive index greater than 2.2 in the operational waveband, an absorption per mm of less than 75% in the operational waveband, and an absorption per mm of greater than 75% in a visible waveband of 400-650 nm.

Abstract: An imaging lens includes, from the object side to the image side, an aperture stop, a first lens with positive refractive power having a convex object-side surface near an optical axis, a second lens with positive refractive power having a convex image-side surface near the axis, a third lens with positive refractive power having a convex image-side surface near the axis, and a fourth lens with negative refractive power having a concave image-side surface near the axis, wherein all lens surfaces are aspheric, all lenses are made of plastic material, a diffractive optical surface is formed on at least one of the lens surfaces from the first lens image-side surface to the second lens image-side surface, and at least one of the three positive lenses satisfies 1.58<Ndi where Ndi is the refractive index of the i-th positive lens at the d-ray.

Abstract: An optical assembly for a point action camera with a wide field of view has multiple lens elements configured to provide a field of view in excess of 150 degrees. One or more lens elements has an aspheric surface with an approximately 30 microns or less sag and an approximately 25 microns/millimeter or less aspheric sag slope.

Abstract: An endoscope tip part has impact resistance even when applied to a thin endoscope, and the light distribution characteristics thereof can be improved even at a wide angle of view. An endoscope tip part includes a tip part main body that is attached to the tip of an insertion section of an endoscope and a positive-power transparent-plastic tip lens that is integrated with the tip part main body through two-color molding. The tip lens is a lens that is located closest to an object, among optical elements constituting an illumination optical system of the endoscope, and the tip part main body is provided with an insertion hole into which two positive-power rear lenses that will be disposed behind the tip lens are inserted.

Abstract: The invention provides an infrared fixed-focus lens of which component lens pieces are made of germanium characterized by low chromatic dispersion, and have no surface processed to serve as diffraction optics. The infrared fixed-focus lens comprises a first lens piece disposed closer to an object and of negative power, and a second lens piece disposed closer to the image plane and of positive power. Both the first and second lens pieces are made of germanium.

Abstract: Provided is an infrared optical system including: three lenses of a first lens, a second lens, and a third lens that are provided from an object side to an image-surface side, the first and third lenses being each configured as a spherical lens made of an inorganic material and having a positive refractive power, the second lens being configured as a meniscus lens made of a resin material and having aspherical surfaces; and an aperture stop that is provided between any two of the first to third lenses.

Abstract: An image lens is disclosed. The image lens includes, arranged in succession from the object side to the image side, an aperture stop S1, a first lens L1 having two convex surfaces and having a positive refractive power, a second lens L2 having a meniscus shape convex toward the object side and having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a meniscus shape convex toward the image side and having a positive refractive power, and a fifth lens L5 having a meniscus shape convex toward the object side and having a negative refractive power.

Abstract: A glass wafer is provided that is made of a copper ions containing phosphate or fluorophosphate glass. The glass wafer has a diameter greater than 15 centimeters and a thickness of less than 0.4 millimeters. The glass wafer has two plane-parallel surfaces at least one of which is polished.

Abstract: An infrared camera lens that is simple in lens configuration and has lens pieces including only spherical surfaces but no aspheric surfaces. The infrared camera lens includes a foremost or first single spherical lens piece of positive refractivity, a succeeding or second single spherical lens piece of negative refractivity, and a third single spherical lens piece of positive refractivity. At least the second single spherical lens piece of negative refractivity or the third single spherical lens piece of positive refractivity is movable for focusing. The design of the infrared camera lens facilitates and implements an airtight environment within the lens barrel because the foremost or first lens closest to the object stays still during focusing, and the entire length of the lens system is unchanged for focusing.

Abstract: An image-pickup optical system includes: a first lens provided near an aperture stop and configured to correct aberration; and a second lens arranged between the first lens and an image sensor and configured to collect light, the first lens being a gradient index lens. The degree of freedom of design of a gradient index lens is higher than that of a lens having a constant refractive index, and a gradient index lens thus has a high potential as a device for a lens. Because such a gradient index lens is employed, it is possible to correct aberration without performing expensive processing such as polishing for example. In other words, as a result, costs may be reduced and image-forming properties may not be reduced at the same time.

Abstract: A method of manufacturing lenses includes creating a wafer-level master, overmolding the wafer-level master to form a daughter replica, casting a polymer lens shapes onto a wafer using the daughter replica, transferring the polymer lens shapes into the wafer, and singulating the wafer to create individual dies with a lens thereon. The wafer may be silicon, e.g., silicon having a resistivity between 0.1 and 100 ?cm.

Abstract: There is provided an infrared optical system includes a light collecting lens having a curved light collecting surface for collecting infrared light incident from an object side, the lens being made of resin having a stepped shape being gradually deeper from periphery to center; and an optical path length correction element for correcting a difference in an optical path length produced by the stepped shape of the light collecting lens. The above-described stepped shape is provided to allow the lens to be thinner than the lens having the plano-convex shape. In other words, the infrared transmittance of the optical system is improved. In addition, the optical path length correction element can correct a difference in an optical path length produced by the stepped shape of the light collecting lens.

Abstract: A passively athermalized infrared imaging system includes an object side meniscus lens that forms at least one aspheric surface, and an image side meniscus lens that forms two aspheric surfaces. Each of the meniscus lenses are formed of a material selected from the group consisting of a chalcogenide glass, germanium, silicon, gallium arsenide, zinc selenide and glass. An optical power of the image side meniscus lens is at least 1.6 times an optical power of the object side meniscus lens such that an effective focus position of the imaging system is athermalized over a range of 0 to +40 degrees Celsius.

Abstract: A lens reflecting a light of a predetermined wavelength, or transmitting and condensing or diverging the light is provided. The lens includes a substrate, and a quasi-periodic structure layer. A plane of the quasi-periodic structure layer is divided into unit cells and is filled with the unit cells in a two-dimensional period. The unit cell has a first region and a second region. An occupancy rate is changed as a distance from a center of the substrate. A resonance mode is defined by a relationship between the occupancy rate and the period length. A lowest order resonance mode is defined by the resonance mode. The period length is set to a predetermined value within a predetermined range including an optimum value. Another lens is provided. A minimum occupancy rate is defined by a smallest occupancy rate. A variation range of the occupancy rate changes across the minimum occupancy rate.

Abstract: An object of the present invention is to provide an optical system for an infrared ray which can provide a bright image, and can be applied to fixed focal length lenses among wide-angle to medium-telephoto. To achieve the object, the optical system for an infrared ray is constituted by a first lens having negative refractive power and a second lens having positive refractive power, these are arranged sequentially from an object side, wherein both the first lens and the second lens are made of an infrared transmitting material that transmits a light beam in an infrared wavelength range of 3 micron-meters or more to 14 micron-meters or less, and at least one of the lenses is made of an infrared transmitting material excluding germanium.

Abstract: An infrared optical system of two-lens structure comprises a front or first lens of negative refractive power and a rear or second lens of positive refractive power disposed in series relative to an object, the first lens having its concave surface faced toward the imaging plane, the second lens having its convex surface faced toward the object, the infrared optical system meeting the requirements as defined in the following formula 2.1?d/f?11, where d is an axial distance from the surface of the first lens closer to the imaging plane to the surface of the second lens closer to the object, and f is a focal length of the entire optical system.

Abstract: Provided is an infrared optical lens system including: a first lens having negative refractive power; and a second lens having positive refractive power, wherein the first lens and the second lens are disposed in this order from an object side to an image side.

Abstract: The invention relates to a lighting apparatus (1) comprising an array (2) of light sources (3) emitting emission cones (4) with edges (5) which intersect in an intersection plane and a lens unit (7) for homogenizing the intensity distribution in the far field. The array of the light sources and the lens unit are arranged such that i) the emission cones traverse the lens unit and ii) the distance (s) between the array of the light sources and the lens unit deviates from the sum of or the difference between a) the focal length f of the lens unit and b) the distance t between the intersection plane and the array (2) of the light sources (3) by 20 percent or less. This configuration leads to an intermixture of the emission cones in the far field such that the intensity distribution in the far field is substantially homogeneous.

Abstract: Provided are a gradient index lens using the effective refractive index of a microstructure operating in the terahertz frequency regions and mid-infrared regions at wavelengths of 0.8 m to 3 mm and a method for manufacturing the same. Based on the effective medium theorem, the effective refractive index is controlled by using a structure smaller than the mid-infrared and terahertz wavelength, and a gradient can be provided for the refractive index in a radial direction and in an axial direction. Thus, beams in the mid-infrared and terahertz frequency region can be converged.

Abstract: An infrared optical lens system including: a first lens which comprises a crystalline material; and a second lens which comprises an amorphous material and is formed by using molding processing, wherein a refractive index of the first lens is greater than that of the second lens, and the first lens and the second lens are disposed in the order from an object to an image.

Abstract: An optical assembly includes: a first lens comprising a crown material; a second lens comprises a primary flint material for wavelengths below about 1.0 ?m; and a third lens comprising a secondary flint material for wavelengths below about 1.0 ?m, wherein the first, second and third lenses together are configured to transmit light and function in the visible, mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) regions of the electromagnetic spectrum. In some implementations, the optical assembly may be configured as an afocal Galilean telescope having an objective lens assembly and a eyepiece lens assembly.

Abstract: A fragmented lens system for creating an invisible light pattern useful to computer vision systems is disclosed. Random or semi-random dot patterns generated by the present system allow a computer to uniquely identify each patch of a pattern projected by a corresponding illuminator or light source. The computer may determine the position and distance of an object by identifying the illumination pattern on the object.

Abstract: A camera device includes a lens module and a birefringent sapphire lens. The sapphire lens is coupled to the lens module as a light window to protect the lens module. The sapphire lens has a crystal structure and a crystal axis. The crystal structure is a single-crystal structure and the crystal axis is one of c-axis (0001), a-axis [including (1 210), (11 20), (2 110), ( 1120), ( 2110) and ( 12 10)], m-axis [including ( 1010), ( 1100), (01 10), (10 10), (1 100), and (0 110)], and r-axis [including (10 11), ( 101 1), (01 11), (0 111), (1 10 1) and r-axis ( 1101)].

Abstract: The invention relates to process for manufacturing infrared optical lenses that will transmit in multiple infrared bands, for example, lenses with multiple optical elements such as doublet and triplet lenses (i.e., achromatic, apochromatic, and superachromatic optical elements). The lens materials are selected on the basis of dispersion ratios and/or minimum dispersions and minimum dispersion wavelengths as defined herein.

Abstract: To provide a sighting device for use in a security sensor system, in which device enables an operator, assigned to conduct a sighting work, to look into the sighting device from a proper direction. The sighting device includes an eyepiece lens provided with a microlens, an objective lens provided with a first marker encompassed within the field of view of the eyepiece lens, and a reflecting mirror disposed on an optical path between the eyepiece lens and the objective lens. The first marker is comprised of a circular contour line or a polygonal contour line and is so set that when a viewing axis offsets from a tolerance, the first marker is viewed with a part thereof dropped out having been offset from the field of view of the microlens.

Abstract: An infrared (IR) light device is provided comprising: a main casing filled with a gas to prevent condensation from forming on an interior surface of the visible light filter; and a plurality of IR light emitting diodes (LEDs) mounted in the main casing, wherein the casing includes heat dissipating features.

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: [Object] To provide a terahertz emission microscope being capable of improving a detection accuracy of a terahertz electromagnetic wave, a photoconductive element and a lens used therefor, and a method of producing a device. [Solving Means] A photoconductive element includes a base material, electrodes and a film material. The base material has an incident surface on which a terahertz electromagnetic wave is incident, the terahertz electromagnetic wave generated by irradiating a device to be observed with a pulse laser generated from a light source. The electrodes are formed on the base material and detect the terahertz electromagnetic wave incident on the incident surface of the base material. The film material is formed on the incident surface of the base material, transmits the terahertz electromagnetic wave and reflects the pulse laser.

Abstract: Imaging device and method, the device including receiver optics, a diffractive and focusing surface, and a pair of diffractive and focusing arrangements, the receiver optics receiving radiation including a first wavelength selected from a first spectral band, and a second spectral band, where the first wavelength is substantially a multiplicative factor less than the midpoint of the second spectral band, the diffractive and focusing surface diffracting the first wavelength at an order of diffraction substantially equal to the multiplicative factor, and diffracting the second spectral band at a first order of diffraction, each of the diffractive and focusing arrangements diffracting, in turn, the first wavelength at a first order of diffraction, such that the first wavelength and the second spectral band emanating from the second diffractive and focusing arrangement focuses at a substantially common focal length and at a substantially common focal plane width.

Abstract: An infrared lens unit includes, in order from the object side, an aperture, a lens group, and a band-pass filter which passes a light beam of a prescribed wavelength band of the infrared region. The lens group further includes, in order from the object side, a first meniscus lens which has a positive power and is convex on the object side, a second meniscus lens which has a positive power and is convex on the image side, and a convex lens which has a positive power and is convex on the object side. The lens group further includes a near-telecentric state on the image side, wherein the angle of entry of the light beam into the band-pass filter is either 0° or close to 0°. Thus, it is possible to accurately pass a light beam of a prescribed wavelength band of the infrared region by the lens unit.

Abstract: A camera device includes a lens module and a birefringent sapphire lens. The sapphire lens is coupled to the lens module as a light window to protect the lens module. The sapphire lens has a crystal structure and a crystal axis. The crystal structure is a single-crystal structure and the crystal axis is one of c-axis (0001), a-axis [including (1 210), (11 20), (2 110), ( 1120), ( 2110) and ( 12 10)], m-axis [including ( 1010), ( 1100), (01 10), (10 10), (1 100), and (0 110)], and r-axis [including (10 11), ( 101 1), (01 11), (0 111), (1 10 1) and r-axis ( 1101)].

Abstract: Focusing devices and methods for controlling a focal position of an objective lens assembly in a night vision optical device are provided. The focusing device includes an objective lens assembly positioned at a first or second focus position from an imaging device and a binary focus controller, coupled to the objective lens assembly, configured to translate the objective lens assembly relative to the imaging device to either the first or second focus position. The objective lens assembly is translated to either the first or second focus position in response to an orientation of the night vision optical device.

Abstract: An article comprises a lens having a width of 0.1 millimeters to 100 millimeters, a length of 0.5 millimeters to 500 millimeters, and a thickness of 0.2 millimeters to 5 millimeters; which transmits more than 60% of light having a wavelength of 760 nanometers to 2500 nanometers. The lens comprises a polymer and a colorant component. The lens is transparent and dimensionally stable at a wall thickness of 0.2 millimeters to 5.0 millimeters and remains transparent and dimensionally stable after being (a) exposed to a precondition of 60° C./60% relative humidity for 120 hours and (b) then subjected to a lead free solder test having a peak temperature of 260° C. for up to 30 seconds.

Abstract: A passive infra red detector comprises a plurality of passive infra red sensors (4, 5) and a lens member (2) arranged to direct radiation from a target area onto the sensors. The lens member (2) forms a substantially hemispherical dome about the infra red sensors (4, 5). The dome has a central axis and a plurality of contiguous facets (2a-2g) distributed about the central axis. Each facet has a flat outer surface and an inner surface that forms a lens to direct radiation onto the sensors. The detector further comprises a first passive infra red sensor (4) aligned with the central axis of the dome and having a sensitive surface substantially normal to the central axis, and a plurality of second passive infra red sensors (5) distributed about the central axis of the dome. The second passive infra red sensors (5) are inclined such that the outward normal from the sensitive surface of each second passive infra red sensor (5) makes an acute angle with the outward direction of the central axis.

Abstract: The present invention relates to an optical filter, a solid-state imaging element and an imaging device lens which contain a near infrared ray absorbing layer having a specific near infrared ray absorbing dye dispersed in a transparent resin having a refractive index of 1.54 or more, and also relates to an imaging device containing the solid-state imaging element or the imaging device lens. The near infrared ray absorbing layer has a transmittance of visible light of from 450 to 600 nm of 70% or more, a transmittance of light in a wavelength region of from 695 to 720 nm of not more than 10%, and an amount of change of transmittance of not more than ?0.

Abstract: This invention provides an imaging lens system, in order from an object side to an image side comprising: a first positive lens element having a convex object-side surface at a paraxial region and a convex image-side surface at the paraxial region; a plastic positive second lens element having a concave object-side surface at the paraxial region, a convex image-side surface at the paraxial region, and both of the object-side and image-side surfaces being aspheric; and a plastic negative third lens element having a concave object-side surface at the paraxial region, a concave at the paraxial region and convex at a peripheral region image-side surface, and both of the object-side and image-side surfaces being aspheric.

Abstract: An infrared-cut (IR-cut) filter includes a substrate and an IR-cut film coated on the substrate. The IR-cut consists of thirty-two high-refractive layers and thirty-two low-refractive layers alternately stacked on the substrate. The first high-refractive layer is in contact with the substrate and the first low-refractive layer is coated on the first high-refractive layer. Transmissivity of the IR-cut film at wavelengths from about 400 nm to about 800 nm is greater than about 90%, while transmissivity of the IR-cut film at wavelengths from about 850 nm to about 1300 nm is less than about 1%, and transmissivity of the IR-cut film at wavelength 795 nm is about 50%.

Abstract: An infrared ray detector comprises a prism element, a condenser lens, and an infrared ray receiving unit. The prism element is configured to convert the infrared ray irradiated from a detection area of a viewing field to the infrared ray proceeding toward the condenser lens. The condenser lens is configured to concentrate the infrared ray into the infrared ray receiving unit. The infrared ray receiving unit includes a plurality of the infrared ray detection elements. The infrared ray detection elements are arranged in an alternate fashion so as to output electrical signals of positive polarity and negative polarity. Consequently, the infrared ray detector is configured to detect the infrared ray irradiated from a plurality of the detection area, and is configured to detect the infrared ray on the basis of movement of the human in the detection area.

Abstract: The present invention is directed to an infrared zoom lens that consists merely of optical components of germanium so as to implement an optical system that is capable of reducing variation in brightness during varying a magnification rate and is quite bright and that facilitates compensating for aberration, especially spherical aberration that is generally hard to do, thereby producing a clear and vivid image. The infrared zoom lens comprises first to fourth groups of lens pieces arranged in series from the foremost position closest to the object; each of the lens groups having all the lens pieces made of germanium, and at least one of the lens groups consisting simply of a single lens piece.

Abstract: A low infrared absorbing lithium glass includes FeO in the range of 0.0005-0.015 wt %, more preferably 0.001-0.010 wt %, and a redox ratio in the range of 0.005-0.15, more preferably in the range of 0.005-010. The glass can be chemically tempered and used to provide a ballistic viewing cover for night vision goggles or scope. A method is provided to change a glass making process from making a high infrared absorbing lithium glass having FeO in the range of 0.02 to 0.04 wt % and a redox ratio in the range of 0.2 to 0.4 to the low infrared absorbing lithium glass by adding additional oxidizers to the batch materials. A second method is provided to change a glass making process from making a low infrared absorbing lithium glass to the high infrared absorbing lithium glass by adding additional reducers to the batch material. In one embodiment of the invention the oxidizer is CeO2. An embodiment of the invention covers a glass made according to the method.

Abstract: Exceptionally crisp infrared images are provided by a binocular infrared imaging system for close in focusing that simultaneously directs the center lines of the optical channels to a close in point while at the same time providing auto focusing.

Abstract: A lens system includes a first lens. The first lens is an IR absorptive lens. The first lens includes a first surface facing the object side, and a second surface facing the image side.

Abstract: A lens includes a first optical surface including an optical axis X, and a first cut end surface at an outer circumference of the first optical surface. The first optical surface has a first SWS configured to reduce reflection of light. The first cut end surface has a second SWS configured to reduce reflection of light. A reflectance of the second SWS with respect to light having a predetermined wavelength is higher than the reflectance of the first SWS with respect to the light having the predetermined wavelength.

Abstract: An infrared absorbing filter includes a glass plate molded by melting a composition of raw materials and cooling the melted composition. The composition of raw materials includes 28-33 by percentage weight (wt %) of phosphorus pentoxide (P2O5), 14-33 wt % of A oxide (A2O), 0.15-4 wt % of B oxide (BO), 2.5-8 wt % of copper oxide (CuO), 1.4-1.65 wt % of aluminum oxide (Al2O3). Wherein A is one of alkali metals, A2O is one of oxidizing alkali metals, B is one of alkaline earth metals, BO is one of oxidizing alkaline earth metals.

Abstract: The invention relates to chalcogenide glass compositions for use in a lens system to balance thermal effects and chromatic effects and thereby provide an achromatic and athermal optical element that efficiently maintains achromatic performance across a broad temperature range. The glass composition is based on sulfur compounded with germanium, arsenic and/or gallium, and may further comprise halides of, for example, silver, zinc, or alkali metals. Alternatively, is based on selenium compounded with gallium, and preferably germanium, and contains chlorides and/or bromides of, for example, zinc, lead or alkali metals.

Abstract: Fiber optic interface modules and assemblies using same are disclosed, wherein the modules and assemblies are tolerant to misalignment and have a high coupling efficiency. The module has at least one lens that defines a folded optical path through the module body. The folded optical path is formed by total internal reflection within the module body from an angled wall of the module. The lens has an aspheric front surface and a planar rear surface and is configured to have an optimum tolerance to a lateral misalignment relative to a light source while maintaining a high coupling efficiency between the light source and an optical fiber.