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.

Abstract: An optical lens includes a lens member and two shade layers on opposite sides of the lens member. The lens member respectively has a lens portion on each side thereof. Each shade layer has an aperture above the corresponding lens portion of the lens member to serve the function of aperture. A method uses optical lithography technique to make such optical lens in a fast way, and the shade layers will have a strong bonding strength with the lens member.

Abstract: The invention relates to an optical device produced by cutting a wafer-scale package comprising at least one optical module formed from a substrate (1) pierced with a plurality of through-holes (2) and optical elements disposed in the holes. According to the invention, at least one of the holes receives two lenses (3, 4) made from at least one polymer material transparent in the 400 nm-700 nm range, each of the lenses being defined by an external diopter and an internal diopter. The invention is characterised in that a space is formed between the internal diopters of two lenses and in that the substrate contains no polymer material between two adjacent through-holes.

Abstract: An infra-red motion detector for monitoring motion in a monitored space is described. The motion detector includes, within a housing, an infra-red radiation sensor sensitive to infra-red radiation incident through a window. A refractive optical system within the housing selects incident infra-red radiation for redirection onto the infra-red sensor. An external light source mounted externally of the housing directs external light through the window providing a recognizable light input. A refractive Fresnel patch mounted externally to the window selects incident light from the external light source and redirects it to a tamper sensor within the housing. A detection controller processes signals output by both sensors in monitoring the space. The detection controller detects incident light from the external light source and trips a tamper alarm in failing detection, and further detects changes in infra-red radiation in the monitored space and trips an intrusion alarm upon detecting changes.

Abstract: Optical filters, infrared (IR) blocking assemblies, and methods for fabricating optical filters are provided herein. In an embodiment, an optical filter includes a transparent base lens having a first surface and a second surface. The optical filter includes an anti-fogging layer as an outermost layer connected to the first surface of the base lens. Further, an infrared (IR) blocking film is bonded to the second surface of the base lens. The IR blocking film includes reflective layers configured to transmit no more than about 40% of IR light.

Abstract: A lens with a graded index of refraction is presented. The lens is formed out of a sheet of material having a uniform thickness with a top surface and a bottom surface. Elongated openings are formed in the top surface extending downwardly to the bottom surface. Material of the elongated sheet is left between adjacent openings. A width of the material between adjacent openings is less than a wavelength of electromagnet energy the lens is configured to refract. The density and distribution openings varies across the sheet of material so that the refractive index of the lens varies across the sheet of material.

Abstract: An image lens, in the order from the object side to the image side thereof, includes a first lens including a first surface and a second surface, a second lens including a third surface and a fourth surface, a third lens including a fifth surface and a sixth surface, a fourth lens including a seventh surface and a eighth surface, a fifth lens including a ninth surface and a tenth surface, and an image plane. The image lens satisfies the following formulas: (1) D/TTL>0.94; (2) D/L>1.21; wherein D is the maximum image diameter of the image plane; TTL is a total length of the image lens, and L is a distance from an outmost edge of the tenth surface to an optical axis of the image lens along a direction perpendicular to the optical axis.

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: 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, that 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. Optically powered surfaces of the imaging lens may include a sag across their respective clear apertures that are less than 10% of a largest clear aperture of the imaging lens. Respective maximum peak to peak thicknesses of the first and second optical elements may be similar in size, for example within 15 percent of each other. Ratios of maximum peak to peak thickness to clear aperture and, separately, to sag are also provided.

Abstract: Provided is an optical arrangement of the infrared camera comprising a lens unit in which a lens is supported by a frame body, an infrared detector module in which an infrared detector for detecting amount of an infrared ray transmitted through the lens as a heat and converting the infrared rays to an image signal is sealed in a housing having a window portion, and a shutter provided between the lens and the infrared detector module. A detector surface of the infrared detector, the window portion, the shutter, and the lens are arranged such that an inclination angle of a virtual straight line which connects each corner portion of the detector surface, the window portion and a maximum aperture of the shutter, and edge portion of an effective lens area of a lens closest to the shutter against to an optical axis is 25° to 35°, is adopted.

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

Abstract: Provided is an optical system for a thermal image microscope. The optical system includes an image forming unit and a relay unit. The image forming unit forms a focus. The relay unit elongates an optical path. Here, the image forming unit includes six lenses. The relay unit includes two lenses. Aspherical surfaces of the lenses are all convex surfaces.

Abstract: A lens module includes a lens barrel and a lens received in the lens barrel. The lens includes an image-side surface and an object-side surface, and is configured for converging or diverging light from the object-side surface to the image-side surface. The lens is made by a composition of raw materials which absorb the infrared element of the light passing therethrough.

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 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: A lens module includes a barrel, at least one lens, and an infrared filter. The at least one lens is received in the barrel. The infrared filter is received in the barrel and neighboring the at least one lens. The infrared filter includes a circular glass substrate and an annular protection film. The circular glass includes two opposite surface. An outer diameter of the protection film is substantially equal to the diameter of the glass substrate. The protection film is coaxially adhered to one of the surfaces.

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: A wide field of view monocentric lens system for an infrared aerial reconnaissance camera includes front and rear lens shell elements and a core lens element, with the number of front and rear shell lens elements depending on the IR band of interest (LWIR, MWIR or SWIR). Infrared radiation entering the monocentric lens passes sequentially through the front shell lens element(s), the core lens element, and the rear shell lens element(s) and is focused onto a curved focal surface. The front shell lens element(s) and the rear shell lens element(s) are made of material having a relatively higher refractive index or a relatively higher optical dispersion, or both, in the band of interest, as compared to the core lens element.

Abstract: An optical lens includes a lens body and an anti-reflection film. The lens body includes an optically effective portion and a peripheral portion surrounding the optically effective portion. The optically effective portion is configured for transmitting light therethrough. The optically effective portion has a first surface and an opposite second surface. The first and second surfaces each have a curvature of greater than zero. The anti-reflection film is formed on the first surface of the optically effective portion. A reflectivity of the anti-reflection film to light rays has wavelengths in a range from about 400 nm to about 850 nm being lower than 2%.

Abstract: This invention provides an NIR imaging lens assembly comprising a lens element with refractive power made of a visible-light-absorbable material, and a filter or a filter film formed on one lens element with refractive power for filtering out infrared light, wherein the number of lens elements with refractive power in the NIR imaging lens assembly is N, and wherein N?2. The above lens arrangement allows light in a specific NIR wavelength range to pass through the lens assembly, thereby reducing interferences or influences from light in the other wavelength ranges. As a result, the resolution of the imaging lens assembly is improved, and its total track length is reduced effectively so that the entire lens system can be compact.

Abstract: The invention relates to a dual-field (NF and WF) imaging system comprising an optronic detector (1) and an optical combination of narrow-field focal length FNF having, an optical axis a front lens, a narrow-field entrance pupil situated in the vicinity of the front lens, a real wide-field entrance pupil, that is to say situated upstream of the front lens, an intermediate focal plane (IFP). The optical combination has, on the optical axis, the following refractive groups: a convergent front group G1 of focal length F, where F<FNF/2, this group G1 comprising the front lens, a divergent field-change group G2 that can move along the optical axis, this group being situated upstream of the IFP in NF configuration and downstream of the IFP in WF configuration, a relay group G3 imaging the IFP on the focal plane of the detector.

Abstract: A method of adjusting the pupil delay compensation of a convergent or divergent beam that includes placing a device composed of an afocal system comprising one or more passive optical components disposed on the propagation axis of the beam, at least one of the components being a focusing diffractive component, and moving the device along the propagation axis of the beam until the required pupil delay compensation is obtained, where the compensation is the algebraic sum of pupil delays of each passive optical component of the afocal system and lying in a range of values the limits of which are functions of the particular combination of the optical components chosen to form the afocal system of the compensation device.

Abstract: The present invention is directed to an infrared zoom lens that is adapted to have a reduced number of lens pieces and that is especially capable of holding field curvature and spherical aberration down on developing more during zooming. The infrared zoom lens comprises the first lens of a single positive-powered lens piece, the second lens of a single negative-powered lens piece, and the third lens of a single positive-powered lens piece where all the lens pieces are spherical lenses; and the infrared zoom lens has its first lens staying still in a fixed position and its second and third lens moved along the optical axis for the zooming.

Abstract: The present invention discloses a lens assembly and a camera module having the lens assembly. An aspect of the present invention provides a lens assembly that can include: a barrel arranged having a space inside thereof; a first lens accommodated in the space; a second lens stacked over the first lens and arranged to be separated from the first lens; and a cap installed over the barrel and configured to provide a load to support the second lens to the barrel.

Abstract: An optical component (6) for a heat screen to be placed between a cold medium and a hot medium, includes a substrate (7) having a first face to be disposed facing towards the cold medium and a second face to be disposed facing towards the hot medium, the substrate being formed from a material that is transparent to optical radiation in the visible and/or near infrared wavelength region and the material having a crystalline or polycrystalline structure. The optical component (6) further includes a thin layer (8) deposited on the second face of the substrate (7), the thin layer (8) being electrically conductive, transparent to visible and/or near infrared optical radiation and reflective to mid and far infrared thermal radiation.

Abstract: A lens accessory for a video game sensor device and a method of adjusting a sensing distance of a video game sensor device. A lens accessory for a video game sensor device includes a first lens configured to cover an infrared light emitter of the video game sensor device, a second lens configured to cover an infrared light receiver of the video game sensor device, and a body portion coupling the first lens and the second lens together, the body portion being removably attachable to the video game sensor device, and the first lens and the second lens having a magnification for adjusting a sensing distance of the video game sensor device.

Abstract: In a method embodiment, a method for correcting astigmatism caused by an aircraft canopy comprises receiving at a compensator module a plurality of light rays that have been refracted by an aircraft canopy. At least two of the refracted light rays have respective foci different from one another and propagate in respective planes that are substantially perpendicular to one another, such that astigmatism occurs. The method further includes using the compensator module to substantially compensate for the astigmatism by providing astigmatic power to the received plurality of light rays. The method also includes providing the plurality of light rays having the astigmatic power compensation to an imaging module. The imaging module is configured to generate imagery using the plurality of light rays having the astigmatic power compensation.

Abstract: Disclosed herein are lens systems that are capable of imaging in the visible spectrum to the far infrared spectrum. The lens systems are formed from optical crystals with different and substantially parallel partial dispersion characteristics.

Abstract: Various embodiments provide an optical system including a first lens group having a plurality of lenses, the first lens group being configured to correct for an axial chromatic aberration; a second lens group having a least one lens, the second lens group being disposed adjacent the first lens group; and a third lens group having a plurality of lenses, the third lens group being configured to correct for a lateral chromatic aberration and field curvature, the third lens group being disposed adjacent the second lens group. The first, second and third lens groups are configured to provide a wide field of view greater than approximately 20 deg., and an f-number of less than approximately F/2 in a wavelength range between approximately 8 ?m and approximately 12 ?m.

Abstract: Disclosed is an optical member in the form of a film or a thin plate. The optical member contains near infrared absorbing particles comprising crystallites of an oxide containing at least Cu and P and having a number average aggregated particle size of at least 20 nm and at most 200 nm. Further, a near infrared cut filter, a solid-state imaging element, a lens for an imaging device and an imaging/display device are disclosed. They comprise a near infrared absorbing layer containing near infrared absorbing particles comprising crystallites of an oxide containing at least Cu and P and having a number average aggregated particle size of at least 20 nm and at most 200 nm.

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: A system for retaining an optical element with a card assembly and heat sink is provided. The retaining system includes an optical element fastener and a retainer member. The optical element fastener is configured to hold the optical element to the heat sink. The retaining member is configured to hold the card assembly to the heat sink, and also serves to make the optical element fastener captive. In one embodiment, the retaining member includes a ridge for holding the card assembly to the heat sink. The top end of the retainer member may also include one or more recessed slots for tool engagement to facilitate fastening of the retainer member. In one embodiment, the retaining member is threaded at the bottom end to fasten the retaining member to the heat sink. Also, in one embodiment the retaining member includes an axial opening used to access the optical element fastener.

Abstract: A monolithic body (31) has a compound optical surface that defines a centrally located lens element (31B) that is transmissive to light having wavelengths of interest, such as infrared radiation (IR), and a reflector (31B) disposed about the lens element that is reflective to the light. The monolithic body is comprised of a material selected for fabricating a refractive lens element. The compound optical surface has a centrally located portion defining the lens element surrounded by a generally curved surface region having a reflective coating that defines the reflector. The centrally located portion may be coated with an anti-reflection coating. The compound optical surface is preferably formed in one operation, such as one that uses a diamond point turning operation.

Abstract: An object of the present invention is to provide an infrared lens unit having a high optical quality and an infrared camera system provided with the infrared lens unit. An infrared lens unit according to the present invention to achieve the object is the infrared lens unit to be attached to an infrared camera-module characterized in comprising a data memory for storing lens data and an image focusing condition is controlled according to the data stored in the data memory and temperature data in the infrared lens unit.

Abstract: A lens unit for an infrared camera is provided with one or more infrared transmitting lenses; a lens barrel which houses the infrared transmitting lens via a lens holding frame; and an actuator for performing image fluctuation correction of an infrared transmitting lens serving as a correction lens using magnetic means to prevent image fluctuation of a photographed image. The lens holding frame for the infrared transmitting lens serve as the correction lens and includes a fixing opening for the infrared transmitting lens and a shielding wall standing in an optical axis direction on an outer periphery of the fixing opening for the lens, and a separating space is provided between the correction lens and the lens barrel.

Abstract: An infrared lens has three lens groups put in serial order from a position closer to an object, namely, the foremost or first group of lens pieces of positive refractivity, the succeeding or second group of lens pieces of negative refractivity, and the rearmost or third group of lens pieces of positive refractivity, and a substance of the second group of lens pieces having greater dispersive power than that or those of the first and third groups of lens pieces. The infrared lens assuredly retains sufficient brightness, namely, having an appropriate numerical aperture, but yet no longer suffers chromatic aberration for rays in a wavelength range of 10 ?m or so in addition to fully correcting spherical aberration, comatic aberration, and curvature of field, thereby attaining clear and vivid focused images.

Abstract: The present invention is directed to a method for making infrared transmitting graded index optical elements by selecting at least two different infrared-transmitting materials, each with a different refractive index, having similar thermo-viscous behavior; assembling the infrared-transmitting materials into a stack comprising one or more layers of each infrared-transmitting material resulting in the stack having a graded index profile; and forming the stack into a desired shape. Also disclosed is the related optical element made by this method.

Abstract: In an embodiment, a method of aligning elements in a manufacturing process includes placing a middle element onto a base element, the base element forming first alignment features, the middle element forming apertures therethrough corresponding to the first alignment features. The method also includes placing second alignment features of an upper element onto the first alignment features such that the first and second alignment features cooperate, through the apertures, to align the upper element with the base element. An infrared lens assembly includes a lens formed of an infrared transmitting material that is disposed within a carrier of a base material, the lens being molded within the carrier with at least one feature that secures the lens to the carrier.

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: The invention provides a system and process in which more than only one category of information must be made available in an optically simultaneously recognizable form to a person in a portable system (17) for protecting and/or guiding persons in dangerous situations, firefighters or rescue teams in buildings. The system includes an infrared camera (12) for recording data, especially heat image data; an energy supply device, especially a battery; at least one interface (18) for transmitting data; and at least one display device (16), especially a monitor and/or a warning light, for visually displaying data. At least one exit finder (13) and/or at least one gas sensor (14) and/or at least one motion detector is also provided.

Abstract: Disclosed herein is an article comprising 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; and the lens transmits light having a wavelength of 600 nanometers to 1600 nanometers, wherein the lens comprises a polymer and the polymer comprises a polyimide comprising structural units derived from specific combinations of compounds wherein 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.