321 results about "Athermalization" patented technology

Projection lenses and projection lens systems are telecentric between an illumination subsystem and a set of imagers. The lenses and systems can exhibit color fringing correction, uniform imager illumination, athermalization, and component articulation for improved imaging. The lenses and systems may be employed in display apparatuses, such as folded display apparatuses that have decreased footprint size, but long effective projection lengths.

A zoom lens is disclosed having a zoom ratio larger than four with a field of view at the short focal length position larger than 85 degrees and with a minimal number of moving groups. The zoom lens utilizes a compound zoom structure comprising an NP or NPP zoom kernel followed by a P or PP zoom relay, with only two or three moving groups that can be used for both zooming, focusing and athermalization. An overall compact package size is achieved by the use of prisms to fold the optical path in strategic locations. An optional variable power liquid cell can provide close focusing with little or no focus breathing.

Projection lenses and projection lens systems are telecentric between an illumination subsystem and a set of imagers. The lenses and systems can exhibit color fringing correction, uniform imager illumination, athermalization, and component articulation for improved imaging. The lenses and systems may be employed in displays, such as folded displays that have decreased footprint size, but long effective projection lengths.

The invention discloses an athermalization high-resolution prime lens which, from the object side to the image side, sequentially comprises: a pre-group lens with negative focal power, a diaphragm, apost-group lens with positive focal power, and an imaging plane, wherein the pre-group lens sequentially comprises a first battery of lenses, a second lens with negative focal power, and a third lenswith positive focal power; the post-group lens sequentially comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, and a seventh lens with positive focal power. According to the athermalization high-resolution prime lens disclosed by the invention, a small high-image-quality athermalization prime lens is designed by reasonably combining spherical surface and non-spherical surface, and has the advantages of simple structure and low cost, and overcomes the defect of low image quality of existing simple-structure lens, and perfectly controls distortion and chromatic aberration in the whole field of view.

A large-relative-aperture long-focal length non-cooled infrared athermalization optical system is arranged in front of the focal plane in the light spreading direction, and is composed of a main reflector, a secondary reflector, a first positive crescent lens, a second positive crescent lens, a reflection/diffraction mixed lens, a movable lens and a second negative crescent lens which are coaxially arranged in parallel. The system adopts a cassette system to increase the optical path by multiple reflections of light, thereby realizing the long coking of the optical system, wherein F<#> is 1; the focal length is 500mm; the center block is smaller or equal to 0.3; and the optical total length and focal length ratio is smaller than or equal to 0.64. Through the secondary imaging, the impact of stray light on the image quality of the system can be effectively inhibited. With the utilization of characteristics of negative dispersion and negative thermal expansion coefficient of the diffractive element and the reasonable distribution of the focal power of the reflection/diffraction mixed lens, the defocusing amount caused by the infrared optical system due to the temperature change is reduced, and combined with the mechanical active athermalization, the image plane defocusing compensation of the system in the temperature range of from -40 DEG C to +60 DEG C is achieved.

The invention relates to an uncooled long-wave infrared optical mechanical athermalizing lens. The optical system of the lens is provided with a front lens group A with negative focal power and a back lens group B with positive focal power which are arranged in turn along an incident direction of light rays from the left to the right. A diaphragm is arranged between the front group A and the back group B. The front group A comprises a crescent lens A-1 and a negative crescent lens A-2 which are arranged from the left to the right in turn. The back group B comprises a biconvex lens B-1. Optical compensation is realized via an optical mechanical hybrid athermalizing technology. A telescoping mechanism group performs telescoping via the principle of thermal expansion and cold contraction. The front group moves, positions of the back group and a sleeve are relatively fixed, and displacement amount generated by the front group is compensated by a compensation elastic sheet after the front group moves. System distortion is relatively low, lens concentricity, precision and axial position are accurate, and the structure of the lens is enabled to be compact and beautiful to the greatest extent.

The invention discloses an infrared double-waveband athermalization optical lens, which is characterized in that working wavebands are 3-5 microns and 8-12 microns and a working ambient temperature range is from -60 DEG C to 80 DEG C. The lens is of a common optical axis Cooke triplet structure and comprises four refractor lens; an aperture diaphragm is arranged at a cold screen of an image surface; in the incidence direction of light, the back surface of a first lens [1] and the front surface of a third lens [3] are aspheric surfaces; the materials of lens are germanium, zinc selenide, zinc sulfide and zinc selenide in sequence; and when the lens focus is normalized, the value range of focal power is as follows: Phi 1 is more than or equal to -1.0 but less than or equal to -0.5, Phi 2 is more than or equal to 1.50 but less than or equal to 2.0, Phi 3 is more than or equal to -2.0 but less than or equal to -1.50, and Phi 4 is more than or equal to 1.0 but less than or equal to 1.5. The optical lens has the advantages that the structure is simple, the imaging quality is high, the athermalization effect is good, the later working distance is long, the cold aperture diaphragm efficiency is 100%, and the like. The infrared double-waveband athermalization optical lens can be used as an infrared double-color guiding head and has wide application prospect in both military and civil fields.

The invention provides an optical compensation continuous zooming passive athermalization optical system, and aims at providing an optical structure which can achieve optical passive athermalization between minus 45 DEG C and 60 DEG C and is suitable for a near-infrared band (0.6 micrometer-1.0 micrometer). The technical scheme of the system is achieved through the facts including that in a lens barrel optical system, a front fixed lens group (7), a front zoom lens group (6), a fixed lens group (5), a rear zoom lens group (4), an aperture diaphragm (3) and a rear fixed lens group (2) are sequentially arranged from an object plane to a focal plane; and in the variable time process, a space between the front zoom lens group and the rear zoom lens group is kept unchanged, a motor fixedly connected to a lens barrel serves as a driving source, zoom lens groups are driven by a gear-guide rail mechanism to move linearly in the direction of an optical axis of the optical system forward and backward, and the front zoom lens group and the rear zoom lens group are driven to be in linkage in the optical axis forward and backward in equidistance, constant speed and identical direction manners to achieve continuous change of a focal distance.

The embodiment of the invention discloses a high-pixel ultrawide-angle optical system which at least comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged from an object plane to an image plane in turn along an optical axis. The object plane side of the first lens is a convex plane, the image plane side is a concave plane, and the focal power is negative; the object plane side of the second lens is a convex plane, the image plane side is a concave plane, and the focal power is negative; the object plane side of the third lens is a convex plane, the image plane side is a concave plane, and the focal power is positive; the object plane side of the fourth lens is a convex plane, the image plane side is a convex plane, and the focal power is positive; the object plane side of the fifth lens is a concave plane, the image plane side is a convex plane, and the focal power is negative; and the object plane side of the sixth lens is a convex plane, the image plane side is a convex plane, and the focal power is positive. Besides, the embodiment of the invention also discloses a camera lens. The high-pixel ultrawide-angle optical system is mainly composed of six lenses so that the number of the lenses is less and the structure is simple, and thus the high-pixel ultrawide-angle optical system has great properties of large aperture, large visual angle, high pixel and great athermalization.

The invention relates to a f19mm large relative aperture mechanical passive type athermalized lens and a compensation adjusting method. The lens comprises an optical system and a mechanical structure. The optical system of the lens is equipped with a convex lens A, a concave lens B and a convex lens C that are sequentially arranged in a light incident direction. The mechanical structure of the lens includes a main lens barrel front set and a main lens barrel back set. A telescoping mechanism set, which is used for positioning and guaranteeing distances and which can telescope according to the principle of expansion with heat and contraction with cold, is disposed between the main lens barrel front set and the main lens barrel back set. The f19mm large relative aperture mechanical passive type athermalized lens has a compact structure, and mechanical passive type athermalization and high transmittance can be achieved. In the optical design, focal power is reasonably distributed, and through combination of lens barrel materials with different coefficients of expansion, the telescoping mechanism set expends with heat and contracts with cold to push the convex lens A to move so that image plane drift compensation is achieved, and temperature self-adaptive mechanical passive type athermalized features are obtained. The lens can match a long-wave infrared un-cooled 640*512,17[mu]m detector to carry out live recording and security monitoring tasks.

The invention provides a compact type double-view-field medium wave infrared athermalization lens. The lens is a one-time imaging lens which is simple in zooming mode, stable in imaging quality and capable of avoiding a heat out-of-focus phenomenon. According to the technical scheme, an infrared optical glass ball cover (2) is arranged between an object plane (1) and a front fixed mirror set (3), the front fixed mirror set is composed of a silicon positive lens and a germanium negative lens, a zooming mirror set (4) which always moves on an optical axis front and back in the zooming process is a biconcave negative lens made of germanium materials, a rear fixed mirror set comprises a biconvex positive lens made of zinc selenide materials and a crescent negative lens made of germanium materials, and the side, close to the object plane, of the biconvex positive lens (501) is an aspheric surface. The ball cover, the front fixed mirror set, the zooming mirror set (4), the rear fixed mirror set and a temperature diaphragm (6) are sequentially arranged through paring combination of the regular lens materials and matching of the linear expansion coefficient alpha L and the length L of lens cone materials, and a complete imaging system is jointly formed.

The invention relates to a long-wave infrared mechanical passive athermalized vehicle-mounted lens and a mounting method thereof. An optical system of the long-wave infrared mechanical passive athermalized vehicle-mounted lens comprises a lens A with positive focal power, a rear lens group B with negative focal power and a lens C with positive focal power, which are arranged from the left side to the right side sequentially at interals in the incident direction of light, wherein both the lens A and the lens C are positive crescent lenses; the rear lens group B is a negative crescent lens; an air space between the lens A and the rear lens group B is 5.21mm; an air space between the rear lens group B and the lens C is 3.78mm; the long-wave infrared mechanical passive athermalized vehicle-mounted lens further comprises a main lens barrel; the lens A, the rear lens group B and the lens C are arranged from the left side to the right side sequentially at intervals in a way of being matched with the inner wall of the main lens barrel. Through thermal expansion and cold contraction of a material and application of a compensating shrapnel, an athermalized design structure is simpler, an overall product is smaller in structure, lighter in weight and high in reliability, and the structure is more convenient for a customer to use on the premise of meeting a requirement of a user on the imaging performance of the product.

A wide field optically athermalized orthoscopic lens system includes, in order from object to image, a first lens having a negative power, a second lens having a positive power, a third lens group having a positive power, a fourth lens having a positive power and a fifth lens having a negative power. The third lens group includes two lenses having, in order, a first lens with positive power and a second lens with negative power. The powers, shapes, Abbe dispersion values and temperature coefficients of refractive indices of the lenses are selected such that the lens system is athermalized, orthoscopic and achromatized over a wide (e.g. >140° C.) temperature range.

The invention relates to a long-wave long-focus uncooled thermalization-free infrared optical system, belonging to the technical field of optics. The optical system comprises an aperture diaphragm, a first lens, a second lens, a third lens and a fourth lens which are sequentially and axially arranged along a light incident direction, wherein the first lens, the second lens and the third lens forma converging group used for correcting primary aberration, the lenses are in a positive-negative-negative-positive symmetrical structure, the first face of the second lens is a rotating and symmetrical diffractive face, and thermal expansion coefficients of the optical elements and the structural materials of the four lens and the intervals and the curvature radii of the four lenses all satisfy aformula. By utilizing different temperature characteristics and linear expansion coefficients of various optical materials and combining with a lens cone material, the self adaptation to the environment is realized to realize a thermalization-free function, which can effectively simplify the structure of an optical machine, reduce system weight, shorten system volume and improve the imaging quality of the optical system in different temperature environments.

The invention discloses an athermal catadioptric homocentric optical system. The system comprises: a fairing, a scanning mirror, a primary mirror, a secondary mirror and a collimating lens group. The primary mirror and the fairing possess a common spherical center and a diaphragm is located on the common spherical center. The primary mirror and the secondary mirror use a same substrate material. The collimating lens group comprises: a first lens, a second lens and a third lens. And performance parameters of the three lenses satisfy following three equations. By using the system of the invention, athermalization can be realized in a scope of (minus 30 degree, 60 degree). Spherical aberration of a hood can be corrected and simultaneously, an optical path does not generate coma aberration, astigmatism and distortion. Heat defocusing amounts of the primary mirror and the secondary mirror are zero. The three lenses of different materials form the collimating lens group. Distribution of a focal power satisfies achromatism and athermalization conditions.

The invention relates to the field of infrared target characteristic simulation, in particular to a transmission-type infrared temperature difference standard source applied to a wide-temperature-range environment. A first black body provides target radiation energy; a second black body provides environment radiation energy; a through hole is formed in the center of an infrared target, and a reflective face is arranged on the periphery of the infrared target; the target radiation energy at the central part of the first black body passes through the through hole of the infrared target and a dichroic mirror, is converged by an athermalization transmission-type infrared optical system to be output. The environment radiation energy provided by the second black body is reflected to the reflective face of the infrared target through the dichroic mirror, and the reflected environment radiation energy can transmits through the dichroic mirror and is output through the athermalization transmission-type infrared optical system. By means of the radiation source system, the transmission-type infrared temperature difference standard source adopts double black bodies, and removes influence of working environment temperature variation in the whole system.

The invention provides a transmission-type non-refrigeration passive athermalization long-wave infrared optical system. According to the optical system, the chalcogenide glass caliber is small, and the optical system has the optical passive athermalization performance and can be used for a non-refrigeration long-wave infrared detector in the 8 micron-12 micron long-wave infrared band. According to the technical scheme, infinite parallel light enters a crescent positive lens (3) with the maximum caliber from an object plane through a spherical cover, so that convergent light is formed; the convergent light enters a crescent negative lens (4), so that the convergence angles are reduced, and part of chromatic aberrations, thermal aberrations and monochromatic aberrations are corrected; the convergence angles are increased through a second crescent positive lens (5) which is purely spherical; through a concave surface negative lens (6) behind the second crescent positive lens (5), the thermal aberrations are balanced, the monochromatic aberrations are reduced, and the convergence angles of the light are reduced; the light enters a rear set, which is a biconvex positive lens (7), of a Petzval structure, and the residual chromatic aberrations, thermal aberrations and monochromatic aberrations of the system are balanced furthermore; imaging is conducted on a detector focal plane (8), and the whole imaging process is completed.