58results about How to "High relative illuminance" patented technology

The invention provides an optical lens and electronic equipment with the same, and the optical lens comprises a first lens which has negative focal power, the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a concave surface; the second lens has negative focal power, the first side surface of the second lens is a concave surface, and the second side surface of the second lens is a convex surface; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has positive focal power, and the first side surface and the second side surface of the fifth lens are convex surfaces; a sixth lens, wherein the sixth lens has negative focal power; a seventh lens, wherein the seventh lens has positive focal power; and the eighth lens has focal power, the first side surface of the eighth lens is a convex surface, and the second side surface of the eighth lens is a concave surface. According to the invention, at least one of the problems of difficulty in miniaturization, small field angle, poor imaging quality in a dark environment, poor temperature performance, serious aberration and poor light transmission capability of an optical lens in the prior art is solved.

The invention discloses an optical lens, which comprises seven lenses and a liquid lens, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface and the image side surface of the third lens are convex surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; a liquid lens with focal power, wherein the liquid lens presents different focal lengths according to different applied voltages; the fifth lens has positive focal power, and the object side surface and the image side surface of the fifth lens are convex surfaces; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface. The optical lens provided by the invention has the advantages of small total length, high relative illumination, high resolution and the like.

The invention discloses an optical lens, a camera module and terminal equipment, the optical lens comprises six lenses with refractive power, the first lens has positive refractive power, and the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface; the second lens has negative refractive power, and the object side surface and the image side surface of the second lens are concave surfaces; the object side surface and the image side surface of the third lens are respectively a concave surface and a convex surface; the fourth lens has positive refractive power, and the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens has positive refractive power, and the object side surface of the fifth lens is a convex surface; the sixth lens has negative refractive power, and the object side surface and the image side surface of the sixth lens are concave surfaces; the optical lens satisfies the following relational expressions: 15 default; hFOVlt, HFOVt; 20deg, FNOlt, 20deg, FNOlt; 2.1. According to the optical lens, the camera module and the terminal equipment, the miniaturization design requirement can be met, and meanwhile the optical lens has the good imaging quality.

The invention discloses an optical lens and electronic equipment. The optical lens sequentially comprises a first lens to a sixth lens from a first side to a second side along an optical axis. Wherein the focal power of the first lens is negative, and the focal power of the third lens is positive. The second side surface of the first lens is a concave surface; the first side surface of the second lens is a concave surface, and the second side surface is a convex surface; the first side surface of the third lens is a convex surface; the second side surface of the sixth lens is a concave surface. The fourth lens and the fifth lens are glued to form a glued lens; the positive and negative attributes of the symbols of the focal power of the fourth lens and the fifth lens are opposite. The optical lens satisfies 1.5 < = TTL / F < = 2.8, 0.25 < = F3 / F < = 1.7, d56 / TTL < = 0.025, 0.225 < = (d8 + d9) / TTL < = 0.4, and R5 / R6 < = 2.

The invention discloses an optical lens and electronic equipment. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from a first side to a second side along an optical axis, at least one of the second lens and the third lens has positive focal power; and the fourth lens and the fifth lens are glued, and the fourth lens and the fifth lens have positive and negative focal power attributes. The effective focal length F2 of the second lens and the total effective focal length F of the lens meet the condition that F2 / F is larger than or equal to 0.85. The curvature radius R11 of the first side face of the first lens and the rise SAG11 of the first side face of the first lens meet the condition that 0.5 < = R11 / SAG11 < = 3.6. The center thickness d1 and the edge thickness ED1 of the first lens meet the condition that d1 / ED1 is larger than or equal to 0.45 and smaller than or equal to 0.9. The maximum field angle FOV of the lens, the image height H corresponding to the maximum field angle of the lens and the total effective focal length F of the lens meet the condition that (FOV * F) / H is larger than or equal to 80 degrees and smaller than or equal to 100 degrees; the combined focal length F45 of the fourth lens and the fifth lens and the total effective focal length F of the lens satisfy 0.5 < = F45 / F < = 8.

The invention discloses an optical lens and electronic equipment. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from a first side to a second side along an optical axis, the second lens has positive focal power; the third lens and the fourth lens are glued and have positive and negative focal powers; the fifth lens has positive focal power; the maximum field angle FOV of the lens, the total effective focal length F of the lens and the image height H corresponding to the maximum field angle of the lens satisfy 72 < = (FOV * F) / H < = 120; the curvature radius R11 of the first side face of the first lens and the rise SAG11 of the first side face of the first lens meet the condition that 0.75 < = R11 / SAG11 < = 10. The curvature radius R21 of the first side face of the second lens, the center thickness d2 of the second lens and the curvature radius R22 of the second side face of the second lens meet the condition that (R21-d2) / R22 is larger than or equal to 0.2 and smaller than or equal to 8. The curvature radius R21 of the first side face of the second lens and the total effective focal length F of the lens meet the condition that R21 / F is larger than or equal to 0.8 and smaller than or equal to 8.5.

An optical lens, a camera module and a terminal device are provided, the optical lens has six lenses with refractive power, the six lenses comprise a first lens to a sixth lens in sequence from an object side to an image side along an optical axis, the refractive power of the first lens is negative, negative, positive, negative, positive and negative, and the object side surface and the image side surface of the first lens are a convex surface and a concave surface near the optical axis respectively; the object-side surface and the image-side surface of the second lens element are respectively a concave surface and a convex surface near the optical axis; the object side surface and the image side surface of the third lens are convex surfaces near the optical axis; the fourth lens element has a convex object-side surface and a concave image-side surface in paraxial regions, respectively; the fifth lens element has an object-side surface and an image-side surface being convex in a paraxial region. The sixth lens element has a concave image-side surface in a paraxial region. The seventh lens element has a convex object-side surface and a concave image-side surface in paraxial regions, respectively. The optical lens satisfies the following relational expressions: 65 degree lt; a FOVlt; the angle is 75 degrees, and the tilt is 3.5 degrees; tTL / Hlt; 4.2. The optical lens provided by the invention can realize miniaturization and has the characteristic of a large field angle.

The invention discloses an optical lens, a camera module and a terminal device, the optical lens comprises seven lenses, the first lens has negative refractive power, and the object side surface and the image side surface of the first lens are a convex surface and a concave surface near an optical axis respectively; the second lens element with negative refractive power has a concave object-side surface and a convex image-side surface in paraxial regions, respectively. The third lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The fourth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region thereof. The fifth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The sixth lens element with negative refractive power has an object-side surface and an image-side surface being concave in a paraxial region. The seventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface in paraxial regions, respectively. The optical lens satisfies the following relational expressions: FOV is greater than or equal to 130 degrees and less than or equal to 160 degrees, and R6 / F3 is greater than or equal to-7.5 and less than or equal to-3.0.

The invention discloses an object space telecentric lens with a long working distance and a large numerical aperture. The object space telecentric lens comprises a front lens group, an aperture diaphragm and a rear lens group which are sequentially arranged from an object space to an image space along an optical axis of the lens. The front lens group comprises a first lens with positive focal power, a second lens with positive focal power, a fourth lens with positive focal power, a sixth lens with positive focal power, an eighth lens with negative focal power, a third lens with negative focal power, a fifth lens with negative focal power, a seventh lens with negative focal power and a ninth lens with negative focal power, the eighth lens and the ninth lens form a second group of doublet lenses, and the fifth lens, the sixth lens and the seventh lens form a first group of triplet lenses. The rear lens group includes a tenth lens and a twelfth lens having positive refractive power, and an eleventh lens and a thirteenth lens having negative refractive power. According to the invention, the thirteen spherical glass lenses are adopted, and the focal power of each lens is reasonably distributed, so that the lens has the advantages of long working distance, large numerical aperture, ultrahigh resolution, high relative illumination, wide spectral range, high telecentricity and the like, and the problem of low resolution of a long-working-distance object space telecentric lens is solved. The measurement precision of the detection lens is improved, and the requirements of some application scenes for higher-performance lenses are met.

The invention provides an optical lens which comprises five lenses, and the five lenses sequentially comprise a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the second lens has focal power; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a plane or a concave surface; wherein the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens meet the following conditions: 1.35 degree lt; an FOV / Fnot; 1.75 DEG C; the back focal length BFL of the optical lens and the total optical length TTL of the optical lens meet the following conditions: 0.4 lt; bFL / TTLlt; and 0.6. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved.

The invention discloses an optical lens, a camera module and a terminal device, the optical lens comprises seven lenses with refractive power, the first lens has negative refractive power, and the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface near an optical axis; the second lens element with negative refractive power has a concave object-side surface and a convex image-side surface in a paraxial region, respectively. The third lens element with positive refractive power has a convex object-side surface and a concave image-side surface in paraxial regions, respectively. The fourth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The fifth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The sixth lens element with negative refractive power has an object-side surface and an image-side surface being concave and convex in a paraxial region thereof. The seventh lens element with positive refractive power has an object-side surface and an image-side surface being convex and concave in a paraxial region thereof. The optical lens satisfies the following relational expressions: 150 deg < = FOV < = 160 deg and 1.4 < = FNO < = 1.55.

This application discloses an optical lens. The optical lens, along its optical axis from the object side to the image side, sequentially comprises: a first lens with negative optical power, its object side being convex and its image side being concave; a second lens with negative optical power, its object side being convex and its image side being concave; a third lens with negative optical power, its object side being concave and its image side being concave; a fourth lens with positive optical power, its object side being convex and its image side being concave; a fifth lens with positive optical power, its object side being convex and its image side being convex; a sixth lens with negative optical power, its image side being concave; a seventh lens with positive optical power, its object side being convex and its image side being convex; and an eighth lens with positive optical power, its object side being convex. The effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy: -8.8 ≤ F1 / F ≤ -7.7.

The invention provides an optical lens and electronic equipment. The optical lens sequentially comprises, from a first side to a second side, a first lens with negative focal power, a second lens with negative focal power and a third lens with negative focal power, the second lens has positive focal power, and the first side surface of the second lens is a convex surface; the first side surface of the third lens is a concave surface, and the second side surface of the third lens is a convex surface; the fourth lens has negative focal power, and the second side surface of the fourth lens is a concave surface; the fifth lens has positive focal power, and the first side surface of the fifth lens is a convex surface; the first side face of the sixth lens is a concave face, and the second side face of the sixth lens is a convex face. According to the invention, the problem that high relative illumination, long back focal length, high resolution and low cost of an optical lens in the prior art are difficult to consider at the same time is solved.

A first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 are sequentially arranged from an object side to an image side along an optical axis, the abbe number of the first lens L1 is V1, the abbe number of the second lens L2 is V2, the abbe number of the third lens L3 is V3, the abbe number of the fourth lens L4 is V4, and V1, V2, V3 and V4 meet the following conditions: 2.8 < = V1-V2 < = 11.6; and 0 < = V3-V4 < = 40.8. According to the lens, optimization of optical performance and miniaturization of the lens are realized; the lens of the invention has the performance of high resolution and large light transmission.

The embodiment of the application discloses a high-definition zoom lens applied to micro-nano high-precision 3D printing, comprising: coaxially arranged lens groups with positive light angles, a diaphragm, a light splitting device, a galvanometer, a protective glass and an imaging surface, wherein the lens groups comprise coaxially arranged first group lenses and second group lenses in sequence, and the diaphragm is located between the first group lenses and the second group lenses. Through the high-definition zoom lens, the printing pixel size can be continuously changed, the lens distortion is small, the relative luminance is high, the light efficiency is high, and the use requirements are met.

The present application discloses an optical lens and an electronic device. The optical lens comprises a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with optical power, a fifth lens with optical power and a sixth lens with positive optical power; the positive and negative properties of the optical powers of the fourth lens and the fifth lens are opposite; the center thickness d8 of the fourth lens on the optical axis, the center thickness d9 of the fifth lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy 0.04≤(d8+d9) / TTL≤0.28; the effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy 2.8≤|F2 / F|; the effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy 1.25≤F6 / F≤3.5; the air interval d34 between the third lens and the fourth lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy 0.12≤d34 / TTL≤0.32.

The invention provides an AR micro-projection color light machine and near-to-eye display equipment, and relates to the technical field of AR. The optical machine comprises an imaging lens group which comprises a diaphragm, a first lens, a second lens, a third lens and three fourth lenses which are sequentially arranged from an object side to an image side along an optical axis; the color combination prism is an X-cube color combination prism, is arranged between the third lens and the fourth lens, and is used for combining the three-color light path into one color light path for outputting; the image source is arranged on the image side of the fourth lens and used for providing an electronic image; wherein the first lens is a positive lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a positive lens, and the second lens and the third lens are cemented lenses. By constructing an optical framework of the lens and the X-cube color combination prism and through cooperation of all optical elements, full-color display can be achieved, and meanwhile the multiple aspects of performance such as the small size, the large field angle, the excellent optical effect and the high definition are taken into account.

The utility model provides an ultra-wide-angle long-wave infrared lens, which comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical axis from an object side to an image side, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens has negative diopter; the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, and the second lens has positive diopter; the object side surface of the third lens is a concave surface, the image side surface of the third lens is a convex surface, and the third lens has negative diopter; the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the fourth lens has a positive diopter. According to the utility model, the design of only four lenses is needed, the manufacturing cost is reduced, the overall size of the lens is small, and the lens is convenient to install and use.

The application discloses a high-resolution optical system for cosmetic removal and color cosmetic detection, comprising seven aspheric lenses, which are a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object plane to an image plane. The application combines positive and negative lenses, reasonably allocates the refractive power of each lens, and makes light transition gently, so that the tolerance sensitivity of the system is significantly reduced, chromatic aberration, spherical aberration, field curvature and distortion are effectively corrected, the resolution and relative luminance are improved, the high-resolution optical system for cosmetic removal and color cosmetic detection has sufficient light flux, high resolution, and unobvious field curvature and distortion, and all the lenses are made of plastic, so that the cost is low and mass production is easy.

An optical lens, a camera module and a terminal device are provided, the optical lens has seven lenses with refractive power, the optical lens sequentially comprises a first lens to a seventh lens from an object side to an image side along an optical axis, the refractive power of the first lens is negative, negative, positive, positive, positive, negative and positive, and the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface near the optical axis; the object-side surface and the image-side surface of the second lens element are respectively a concave surface and a convex surface near the optical axis; the object-side surface and the image-side surface of the third lens element are respectively a convex surface and a concave surface near the optical axis; the fourth lens element has an object-side surface and an image-side surface being convex in a paraxial region. The fifth lens element has an object-side surface and an image-side surface being convex in a paraxial region. The sixth lens element has an object-side surface and an image-side surface being concave in a paraxial region. The seventh lens element has a convex object-side surface and a concave image-side surface in paraxial regions, respectively. The optical lens satisfies the following relational expressions: FOV is greater than or equal to 140 degrees and less than or equal to 150 degrees, 7.2 lt; tTL / Flt; and 7.6. The optical lens provided by the invention can realize miniaturization, has the characteristic of a large field angle, and improves the imaging quality of the optical lens.

The present invention provides an optical lens, which includes, from the object side to the imaging surface along the optical axis: a first lens with positive focal power, whose object side surface is convex and whose image side surface is concave; a second lens with negative focal power, whose object side surface is convex and whose image side surface is concave; a third lens with positive focal power, whose object side surface is convex and whose image side surface is concave; a fourth lens with negative focal power, whose object side surface is concave near the optical axis and whose image side surface is concave; a fifth lens with positive focal power, whose object side surface is convex and whose image side surface is concave; a sixth lens with negative focal power; a seventh lens with negative focal power, whose object side surface is concave and whose image side surface is convex; and an eighth lens with negative focal power, whose object side surface is concave. The optical lens provided by the present invention has one or more advantages such as telephoto performance, large target surface, large aperture, and short total length.

The present invention provides an ultra-wide-angle lens, which sequentially includes a first lens, a second lens, a diaphragm, a third lens and a fourth lens from the object side to the image side along the optical axis. The first lens, the second lens, the diaphragm, the third lens and the fourth lens are coaxially arranged in sequence from the object side to the image side. Among them, the first lens and the fourth lens have negative optical powers, and the second lens and the third lens have positive optical powers. For this ultra-wide-angle lens, by centrally arranging the diaphragm and optimizing the lens structure, the optical powers of the lenses in the lens structure are distributed as negative, positive, positive, negative, effectively reducing the off-axis aberration, improving the relative illumination of the edge field of view of the ultra-wide-angle lens and the imaging quality. With the use of 4 plastic aspherical lenses and a lens design with 1.5 < TTL / 2Y < 2.5, the manufacturing difficulty and the unit cost are reduced, while the optical performance is improved.

The invention discloses an optical lens, a camera module and a terminal device, the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens has negative refractive power, the second lens has refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has refractive power, and the sixth lens has refractive power. The fifth lens has negative refractive power, the sixth lens has positive refractive power, and the optical lens satisfies the following relational expressions: 1.5 lt; a TTL / CTALlt; 2.2, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, and CTAL is the sum of the thicknesses of the first lens to the sixth lens on the optical axis. According to the optical lens provided by the invention, the light, thin and miniaturized design of the optical lens can be realized, and meanwhile, the optical lens has relatively high imaging quality.

The invention discloses an optical lens and electronic equipment. The zoom lens sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with positive focal power from a first side to a second side along an optical axis. The first side surfaces of the first lens and the second lens are convex surfaces, and the second side surfaces are concave surfaces. The first side surface of the third lens is a convex surface. The second side surface of the fourth lens is a convex surface. The first side surface of the fifth lens is a concave surface, and the second side surface is a convex surface. The first side surface of the sixth lens is a convex surface, and the second side surface is a convex surface. The optical lens satisfies:-11.7 < = R9 / F < =-1 and 14 < = (F4 + F5) / F < = 58, where R9 is the radius of curvature of the first side surface of the fifth lens, F is the total effective focal length of the optical lens, F4 is the effective focal length of the fourth lens, and F5 is the effective focal length of the fifth lens.

The application discloses a 25mm half-frame aerial photography lens and relates to the technical field of optical lenses. The 25mm half-frame aerial photography lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a photosensitive chip arranged from an object side to an image side. Each lens satisfies the following conditional expressions: -1.2<F1 / F<-0.8, 0.4<F2 / F<0.6, -0.5<F3 / F<-0.3, 0.4<F4 / F<0.8, 0.4<F5 / F<0.8, -1.3<F6 / F<-1, wherein F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, and F is the focal length of the optical lens. The 25mm half-frame aerial photography lens has the performances of high pixels, low distortion, high relative luminance and low chromatic aberration under the premise of half frame.

This invention provides an all-glass vehicle-mounted day and night confocal optical system and its application camera module, mainly composed of 8 lenses. The first lens has negative optical power, a convex object side, and a concave image side; the second lens has negative optical power, a concave object side, and a convex image side; the third lens has positive optical power, a convex object side, and a concave image side; the fourth lens has negative optical power, a convex object side, and a concave image side; the fifth lens has positive optical power, a convex object side, and a convex image side; the fourth and fifth lenses form a bonded lens; the sixth lens has positive optical power, a convex object side, and a convex image side; the seventh lens has negative optical power and a concave image side; and the eighth lens has optical power and a concave image side. The structure is simple and has advantages such as high resolution, large target area, small size, high relative illumination, and high pixel imaging, improving the uniformity of image illumination and image clarity.

The invention provides a TOF imaging lens for a solid-state laser radar, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, an optical filter and a receiving chip, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged along an optical axis from an object space to an image space, and the diaphragm is arranged between the second lens and the third lens. The optical filter is located on the image side face of the sixth lens, and the receiving chip is arranged at the rear end of the sixth lens and converts an optical image into an electric signal. The six lenses are adopted, the shape and the center thickness of each lens are optimally arranged, the focal power and the material refractive index are reasonably distributed, the position of the diaphragm is optimized, the cooperation of the air space between each lens and the diaphragm is optimized, and the like, so that a large field angle can be achieved within the wave band of 830-960 nm, the field angle can reach 120 degrees, and the imaging quality is good.

The invention discloses an optical system, a camera module and electronic equipment, the optical system comprises seven lenses with refractive power, and the optical system sequentially comprises a first lens, a fourth lens and a sixth lens with positive refractive power, and a second lens, a third lens, a fifth lens and a seventh lens with negative refractive power from an object side to an image side along an optical axis; wherein the object side surface of the first lens, the object side surface of the second lens, the object side surface of the third lens, the image side surface of the fourth lens, the object side surface of the fifth lens, the object side surface of the sixth lens and the object side surface of the seventh lens are convex surfaces near the optical axis; the image side surface of the first lens, the image side surface of the second lens, the image side surface of the third lens, the image side surface of the fifth lens, the image side surface of the sixth lens and the image side surface of the seventh lens are concave surfaces at the positions close to the optical axis. The optical system can satisfy miniaturization, and has a good imaging effect and a variable aperture characteristic.

The invention provides a scanning lens. The scanning lens comprises an aperture diaphragm, a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, the first lens is a positive lens, the object-side surface is convex in a paraxial region, and the image-side surface is concave in a paraxial region. The second lens is a negative lens, the object side surface is a concave surface near the optical axis, and the image side surface is a convex surface near the optical axis; the third lens is a positive lens, the object side surface of the positive lens is a concave surface near the optical axis, and the image side surface of the positive lens is a convex surface near the optical axis; the fourth lens is a negative lens, the object side surface is a concave surface in a paraxial region, and the image side surface is a concave surface in a paraxial region. The scanning lens meets the requirements of high-definition imaging and high relative illumination, the total length of the lens is shortened, the production efficiency is improved, the material cost of the lens is lower, a new design framework and a brand new film system are matched, the size is small, and the mass production performance is excellent.

The invention relates to a short-wave system with an ultra-large target surface. The short-wave system comprises a negative meniscus lens A, a positive meniscus lens B, a biconcave negative lens C, a positive meniscus lens D, a negative meniscus lens E, a positive meniscus lens F, a reflector 1, a reflector 2, a positive meniscus lens G, a negative meniscus lens H and a positive meniscus lens I which are sequentially arranged in the direction of an optical path. The matched detector J is a refrigeration type short wave infrared detector, and the size of an imaging target surface of the detector is not less than phi 60mm. The cold diaphragm is located at the tail end of the system, and the efficiency of the cold diaphragm is 100% during design, so that stray light entering is reduced, and the detection sensitivity of the system is improved. According to the system, a secondary imaging Z-shaped turning structure form is adopted, an aspheric surface is combined, materials are reasonably selected, and focal power of each lens is distributed, so that the large target surface design is realized, and meanwhile, the system aperture is compressed, the system length is shortened, and the system volume is reduced.