Large-view double-telecentric lens

Abstract

A large-field-of-view double telecentric lens comprises an optical amplification group, an imaging group and an aperture diaphragm arranged between the optical amplification group and the imaging group, the optical amplification group and the imaging group are composed of twelve lenses in total, and through design optimization of the lenses, the image plane of the optical amplification group and the object plane of the imaging group coincide at the aperture diaphragm. Therefore, the large-view double-telecentric lens is formed among the optical amplification group, the aperture diaphragm and the imaging group, and the detection precision of the optical lens in the field of industrial detection is improved by utilizing the good optical characteristics of high resolution, low distortion and the like of the large-view double-telecentric lens. Therefore, the lens can adapt to wider and more complex working environments and working requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of optical design, in particular to a large-viewing-field double-telecentric lens. Background Art

[0002] At present, bi-telecentric lenses have a very important impact on high-precision measurement in industry, but most of the existing bi-telecentric lenses generally have a small field of view. When encountering a measured object that requires a larger field of view, it is impossible to capture the entire object at one time. Although some products can achieve a lens field of view of 300mm or more, the contrast is relatively low, especially the distortion and telecentricity are too large, which can hardly meet customers' needs for large field of view precision measurement. Therefore, it is necessary to develop a bi-telecentric lens with an ultra-large field of view to solve the problems of small field of view, high distortion and low contrast. Utility Model Content

[0003] In view of the shortcomings of the background technology, the purpose of the utility model is to provide a large-viewing-field bi-telecentric lens.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A large-viewing-field bi-telecentric lens comprises an optical magnification group and an imaging group arranged in sequence from an object plane to an image plane, and an aperture stop arranged between the optical magnification group and the imaging group, wherein:

[0006] The optical magnification group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence from the object plane to the image plane, wherein the first lens is a concave-convex lens, the second lens is a concave-convex lens, the third lens is a plano-convex lens, the fourth lens is a concave-convex lens, the fifth lens is a concave-convex lens, the sixth lens is a concave-convex lens, the seventh lens is a concave-convex lens, and the eighth lens is a biconvex lens;

[0007] The imaging group includes a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence from the object plane to the image plane, wherein the ninth lens is a biconvex lens, the tenth lens is a meniscus lens, the eleventh lens is a biconvex lens, and the twelfth lens is a biconcave lens.

[0008] Furthermore, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens are spherical lenses.

[0009] Further, the radius of curvature of the light incident surface of the first lens is -425.039×(1-5%)mm~-425.039×(1+5%)mm, and the radius of curvature of the light exit surface of the first lens is -355.088×(1-5%)mm~-355.088×(1+5%)mm; the radius of curvature of the light incident surface of the second lens is -1341.067×(1-5%)mm~-1341.067×(1+5%)mm, and the radius of curvature of the light exit surface of the second lens is -716.032×(1-5%)mm~-716.032×(1+5%)mm; the radius of curvature of the light incident surface of the third lens is 1092.987×(1-5%)mm~ 1092.987×(1+5%)mm, the light exiting surface of the third lens is a plane; the curvature radius of the light incident surface of the fourth lens is 440.641×(1-5%)mm~440.641×(1+5%)mm, the curvature radius of the light exiting surface of the fourth lens is 798.885×(1-5%)mm~798.885×(1+5%)mm; the curvature radius of the light incident surface of the fifth lens is 231.631×(1-5%)mm~231.631×(1+5%)mm, the curvature radius of the light exiting surface of the fifth lens is 341.644×(1-5%)mm~341.644×(1+5%)mm; the curvature radius of the light incident surface of the sixth lens is 11 5.075×(1-5%)mm~115.075×(1+5%)mm, the radius of curvature of the light exit surface of the sixth lens is 136.834×(1-5%)mm~136.834×(1+5%)mm; the radius of curvature of the light incident surface of the seventh lens is 77.745×(1-5%)mm~77.745×(1+5%)mm, the radius of curvature of the light exit surface of the seventh lens is 82.840×(1-5%)mm~82.840×(1+5%)mm; the radius of curvature of the light incident surface of the eighth lens is 164.258×(1-5%)mm~164.258×(1+5%)mm, the radius of curvature of the light exit surface of the eighth lens is -116.7 44×(1-5%)mm~-116.744×(1+5%)mm; the curvature radius of the light incident surface of the ninth lens is 196.852×(1-5%)mm~196.852×(1+5%)mm, and the curvature radius of the light exit surface of the ninth lens is -50.440×(1-5%)mm~-50.440×(1+5%)mm; the curvature radius of the light incident surface of the tenth lens is -446.013×(1-5%)mm~-446.013×(1+5%)mm, and the curvature radius of the light exit surface of the tenth lens is -74.813×(1-5%)mm~-74.813×(1+5%)mm; the curvature radius of the light incident surface of the eleventh lens is 57.166×(1-5%)mm~57.166×(1+5%)mm, the curvature radius of the light exit surface of the eleventh lens is -75.227×(1-5%)mm~-75.227×(1+5%)mm; the curvature radius of the light entrance surface of the twelfth lens is -48.498×(1-5%)mm~-48.498×(1+5%)mm, the curvature radius of the light exit surface of the twelfth lens is 104.523×(1-5%)mm~104.523×(1+5%)mm. .

[0010] Further, the center thickness of the first lens is 13.998×(1-5%)mm~13.998×(1+5%)mm; the center thickness of the second lens is 14.002×(1-5%)mm~14.002×(1+5%)mm; the center thickness of the third lens is 14.805×(1-5%)mm~14.805×(1+5%)mm; the center thickness of the fourth lens is 14.000×(1-5%)mm~14.000×(1+5%)mm; the center thickness of the fifth lens is 14.001×(1-5%)mm~14.001×(1+5%)mm; the center thickness of the sixth lens is 14.001×(1-5%)mm~14.001×(1 +5%)mm; the center thickness of the seventh lens is 7.842×(1-5%)mm~7.842×(1+5%)mm; the center thickness of the eighth lens is 5.127×(1-5%)mm~5.127×(1+5%)mm; the center thickness of the ninth lens is 7.842×(1-5%)mm~7.842×(1+5%)mm; the center thickness of the tenth lens is 5.127×(1-5%)mm~5.127×(1+5%)mm; the center thickness of the eleventh lens is 11.353×(1-5%)mm~11.353×(1+5%)mm; the center thickness of the twelfth lens is 8.666×(1-5%)mm~8.666×(1+5%)mm.

[0011] Further, the distance between the air gap of the first lens and the second lens on the optical axis is 50.013×(1-5%)mm~50.013×(1+5%)mm; the distance between the air gap of the second lens and the third lens on the optical axis is 50.026×(1-5%)mm~50.026×(1+5%)mm; the distance between the air gap of the third lens and the fourth lens on the optical axis is 45.408×(1-5%)mm~45.408×(1+5%)mm; The distance between the air space of the fourth lens and the fifth lens on the optical axis is 48.017×(1-5%)mm to 48.017×(1+5%)mm; the distance between the air space of the fifth lens and the sixth lens on the optical axis is 45.328×(1-5%)mm to 45.328×(1+5%)mm; the distance between the air space of the sixth lens and the seventh lens on the optical axis is 50.000×(1-5%)mm to 50.000×(1+5%)mm; the distance between the air space of the seventh lens and the The distance of the air gap of the eighth lens on the optical axis is 50.001×(1-5%)mm~50.001×(1+5%)mm; the distance of the air gap between the eighth lens and the aperture stop on the optical axis is 19.387×(1-5%)mm~19.387×(1+5%)mm; the distance of the air gap between the aperture stop and the ninth lens on the optical axis is 1.000×(1-5%)mm~1.000×(1+5%)mm; the distance of the air gap between the ninth lens and the tenth lens on the optical axis is 1.000×(1-5%)mm~1.000×(1+5%)mm; The distance between the tenth lens and the eleventh lens on the optical axis is 0.500×(1-5%)mm~0.500×(1+5%)mm; the distance between the air gap between the tenth lens and the eleventh lens on the optical axis is 0; the distance between the air gap between the eleventh lens and the twelfth lens on the optical axis is 3.063×(1-5%)mm~3.063×(1+5%)mm; the distance between the air gap between the twelfth lens and the image plane on the optical axis is 4.223×(1-5%)mm~4.223×(1+5%)mm.

[0012] Furthermore, the refractive index of the first lens is 1.79; the refractive index of the second lens is 1.64; the refractive index of the third lens is 1.53; the refractive index of the fourth lens is 1.68; the refractive index of the fifth lens is 1.49; the refractive index of the sixth lens is 1.81; the refractive index of the seventh lens is 1.53; the refractive index of the eighth lens is 1.44; the refractive index of the ninth lens is 1.62; the refractive index of the tenth lens is 1.82; the refractive index of the eleventh lens is 1.72; and the refractive index of the twelfth lens is 1.53.

[0013] Furthermore, the Abbe number of the first lens is 47.5×(1-5%)mm~47.5×(1+5%)mm; the Abbe number of the second lens is 60.1×(1-5%)mm~60.1×(1+5%)mm; the Abbe number of the third lens is 77.0×(1-5%)mm~77.0×(1+5%)mm; the Abbe number of the fourth lens is 48.2×(1-5%)mm~48.2×(1+5%)mm; the Abbe number of the fifth lens is 81.8×(1-5%)mm~81.8×(1+5%)mm; the Abbe number of the sixth lens is 40.9×(1-5%)mm~40.9×(1+5%)mm m; the Abbe number of the seventh lens is 62.2×(1-5%)mm~62.2×(1+5%)mm; the Abbe number of the eighth lens is 90.7×(1-5%)mm~90.7×(1+5%)mm; the Abbe number of the ninth lens is 63.5×(1-5%)mm~3.5×(1+5%)mm; the Abbe number of the tenth lens is 37.5×(1-5%)mm~37.5×(1+5%)mm; the Abbe number of the eleventh lens is 48.0×(1-5%)mm~48.0×(1+5%)mm; the Abbe number of the twelfth lens is 49.0×(1-5%)mm~49.0×(1+5%)mm.

[0014] The beneficial effects of the utility model are:

[0015] The utility model proposes a large-field bi-telecentric lens, comprising an optical magnification group, an imaging group and an aperture diaphragm arranged between the optical magnification group and the imaging group, wherein the optical magnification group and the imaging group are composed of twelve lenses in total, and through design optimization of each lens, the image plane of the optical magnification group and the object plane of the imaging group are overlapped at the aperture diaphragm, so that a large-field bi-telecentric lens is formed between the optical magnification group, the aperture diaphragm and the imaging group, and the good optical properties of the large-field bi-telecentric lens, such as high resolution and low distortion, are utilized to improve the detection accuracy of the optical lens in the field of industrial detection, so that the lens can adapt to a wider and more complex working environment and working requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of a large-viewing-field bi-telecentric lens of the utility model;

[0018] In the figure, 10 is the first lens; 20 is the second lens; 30 is the third lens; 40 is the fourth lens; 50 is the fifth lens; 60 is the sixth lens; 70 is the seventh lens; 80 is the eighth lens; 90 is the ninth lens; 100 is the tenth lens; 110 is the eleventh lens; 120 is the twelfth lens; and 130 is the aperture stop. DETAILED DESCRIPTION

[0019] Combine the following Figure 1 The utility model is described in detail.

[0020] A large-viewing-field bi-telecentric lens comprises an optical magnification group and an imaging group arranged in sequence from an object plane to an image plane, and an aperture stop 130 arranged between the optical magnification group and the imaging group, wherein:

[0021] The optical magnification group includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70 and an eighth lens 80 which are arranged in sequence from the object plane to the image plane, wherein the first lens is a concave-convex lens, the second lens is a concave-convex lens, the third lens is a plano-convex lens, the fourth lens is a concave-convex lens, the fifth lens is a concave-convex lens, the sixth lens is a concave-convex lens, the seventh lens is a concave-convex lens, and the eighth lens is a biconvex lens;

[0022] The imaging group includes a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence from the object plane to the image plane, wherein the ninth lens is a biconvex lens, the tenth lens is a meniscus lens, the eleventh lens is a biconvex lens, and the twelfth lens is a biconcave lens.

[0023] In this embodiment, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70, the eighth lens 80, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens are spherical lenses.

[0024] In this embodiment, the radius of curvature of the light incident surface of the first lens 10 is -425.039×(1-5%)mm to -425.039×(1+5%)mm, and the radius of curvature of the light exit surface of the first lens 10 is -355.088×(1-5%)mm to -355.088×(1+5%)mm; the radius of curvature of the light incident surface of the second lens 20 is -1341.067×(1-5%)mm to -1341.067×(1+5%)mm, and the radius of curvature of the light exit surface of the second lens 20 is -716.032×(1-5%)mm to -716.032×(1+5%)mm; the radius of curvature of the light incident surface of the third lens 30 is 1092.987×( The light exiting surface of the third lens 30 is a plane; the radius of curvature of the light incident surface of the fourth lens 40 is 440.641×(1-5%)mm~440.641×(1+5%)mm, and the radius of curvature of the light exiting surface of the fourth lens 40 is 798.885×(1-5%)mm~798.885×(1+5%)mm; the radius of curvature of the light incident surface of the fifth lens 50 is 231.631×(1-5%)mm~231.631×(1+5%)mm, and the radius of curvature of the light exiting surface of the fifth lens 50 is 341.644×(1-5%)mm~341.644×(1+5%)mm; The radius of curvature of the light incident surface of the lens 60 is 115.075×(1-5%)mm~115.075×(1+5%)mm, and the radius of curvature of the light exit surface of the sixth lens 60 is 136.834×(1-5%)mm~136.834×(1+5%)mm; the radius of curvature of the light incident surface of the seventh lens 70 is 77.745×(1-5%)mm~77.745×(1+5%)mm, and the radius of curvature of the light exit surface of the seventh lens 70 is 82.840×(1-5%)mm~82.840×(1+5%)mm; the radius of curvature of the light incident surface of the eighth lens 80 is 164.258×(1-5%)mm~164.258×(1+5%)mm m, the curvature radius of the light-emitting surface of the eighth lens 80 is -116.744×(1-5%)mm~-116.744×(1+5%)mm; the curvature radius of the light-entering surface of the ninth lens 90 is 196.852×(1-5%)mm~196.852×(1+5%)mm, and the curvature radius of the light-emitting surface of the ninth lens 90 is -50.440×(1-5%)mm~-50.440×(1+5%)mm; the curvature radius of the light-entering surface of the tenth lens 100 is -446.013×(1-5%)mm~-446.013×(1+5%)mm, and the curvature radius of the light-emitting surface of the tenth lens 100 is -74.813×(1-5%)mm~-74.813×(1+5%)mm; the curvature radius of the light incident surface of the eleventh lens 110 is 57.166×(1-5%)mm~57.166×(1+5%)mm, and the curvature radius of the light exit surface of the eleventh lens 110 is -75.227×(1-5%)mm~-75.227×(1+5%)mm; the curvature radius of the light incident surface of the twelfth lens 120 is -48.498×(1-5%)mm~-48.498×(1+5%)mm, and the curvature radius of the light exit surface of the twelfth lens 120 is 104.523×(1-5%)mm~104.523×(1+5%)mm. .

[0025] In this embodiment, the center thickness of the first lens 10 is 13.998×(1-5%)mm~13.998×(1+5%)mm; the center thickness of the second lens 20 is 14.002×(1-5%)mm~14.002×(1+5%)mm; the center thickness of the third lens 30 is 14.805×(1-5%)mm~14.805×(1+5%)mm; the center thickness of the fourth lens 40 is 14.000×(1-5%)mm~14.000×(1+5%)mm; the center thickness of the fifth lens 50 is 14.001×(1-5%)mm~14.001×(1+5%)mm; the center thickness of the sixth lens 60 is 14.001×(1-5%)mm~14.001×(1+ the center thickness of the seventh lens 70 is 7.842×(1-5%)mm~7.842×(1+5%)mm; the center thickness of the eighth lens 80 is 5.127×(1-5%)mm~5.127×(1+5%)mm; the center thickness of the ninth lens 90 is 7.842×(1-5%)mm~7.842×(1+5%)mm; the center thickness of the tenth lens 100 is 5.127×(1-5%)mm~5.127×(1+5%)mm; the center thickness of the eleventh lens 110 is 11.353×(1-5%)mm~11.353×(1+5%)mm; the center thickness of the twelfth lens 120 is 8.666×(1-5%)mm~8.666×(1+5%)mm.

[0026] In this embodiment, the distance between the air gap of the first lens and the second lens on the optical axis is 50.013×(1-5%)mm~50.013×(1+5%)mm; the distance between the air gap of the second lens and the third lens on the optical axis is 50.026×(1-5%)mm~50.026×(1+5%)mm; the distance between the air gap of the third lens and the fourth lens on the optical axis is 45.408×(1-5%)mm~45.408×(1+5%)mm; The distance between the air gap of the fourth lens and the fifth lens on the optical axis is 48.017×(1-5%)mm~48.017×(1+5%)mm; the distance between the air gap of the fifth lens and the sixth lens on the optical axis is 45.328×(1-5%)mm~45.328×(1+5%)mm; the distance between the air gap of the sixth lens and the seventh lens on the optical axis is 50.000×(1-5%)mm~50.000×(1+5%)mm; the distance between the air gap of the seventh lens and the eighth lens on the optical axis is 50.000×(1-5%)mm~50.000×(1+5%)mm; The distance of the air gap between the eighth lens and the aperture stop 130 on the optical axis is 50.001×(1-5%)mm~50.001×(1+5%)mm; the distance of the air gap between the eighth lens and the aperture stop 130 on the optical axis is 19.387×(1-5%)mm~19.387×(1+5%)mm; the distance of the air gap between the aperture stop 130 and the ninth lens on the optical axis is 1.000×(1-5%)mm~1.000×(1+5%)mm; the distance of the air gap between the ninth lens and the tenth lens on the optical axis is 1.000×(1-5%)mm~1.000×(1+5%)mm; The distance between the air gaps on the optical axis is 0.500×(1-5%)mm~0.500×(1+5%)mm; the distance between the air gaps of the tenth lens and the eleventh lens on the optical axis is 0; the distance between the air gaps of the eleventh lens and the twelfth lens on the optical axis is 3.063×(1-5%)mm~3.063×(1+5%)mm; the distance between the air gaps of the twelfth lens and the image plane on the optical axis is 4.223×(1-5%)mm~4.223×(1+5%)mm.

[0027] In this embodiment, the refractive index of the first lens 10 is 1.79; the refractive index of the second lens 20 is 1.64; the refractive index of the third lens 30 is 1.53; the refractive index of the fourth lens 40 is 1.68; the refractive index of the fifth lens 50 is 1.49; the refractive index of the sixth lens 60 is 1.81; the refractive index of the seventh lens 70 is 1.53; the refractive index of the eighth lens 80 is 1.44; the refractive index of the ninth lens 90 is 1.62; the refractive index of the tenth lens 100 is 1.82; the refractive index of the eleventh lens 110 is 1.72; and the refractive index of the twelfth lens 120 is 1.53.

[0028] In this embodiment, the Abbe number of the first lens 10 is 47.5×(1-5%)mm~47.5×(1+5%)mm; the Abbe number of the second lens 20 is 60.1×(1-5%)mm~60.1×(1+5%)mm; the Abbe number of the third lens 30 is 77.0×(1-5%)mm~77.0×(1+5%)mm; the Abbe number of the fourth lens 40 is 48.2×(1-5%)mm~48.2×(1+5%)mm; the Abbe number of the fifth lens 50 is 81.8×(1-5%)mm~81.8×(1+5%)mm; the Abbe number of the sixth lens 60 is 40.9×(1-5%)mm~40.9×(1+5%)mm The Abbe number of the seventh lens 70 is 62.2×(1-5%)mm~62.2×(1+5%)mm; the Abbe number of the eighth lens 80 is 90.7×(1-5%)mm~90.7×(1+5%)mm; the Abbe number of the ninth lens 90 is 63.5×(1-5%)mm~3.5×(1+5%)mm; the Abbe number of the tenth lens 100 is 37.5×(1-5%)mm~37.5×(1+5%)mm; the Abbe number of the eleventh lens 110 is 48.0×(1-5%)mm~48.0×(1+5%)mm; the Abbe number of the twelfth lens 120 is 49.0×(1-5%)mm~49.0×(1+5%)mm.

[0029] In this embodiment, the distance between the object and the first lens 10 on the optical axis is 100×(1-5%)mm~100×(1+5%)mm, the magnification of the proposed large-viewing-field bi-telecentric lens is 0.112, the aperture of the first lens 10 reaches 200mm, and the working band is 480nm-660nm. In summary, the large-viewing-field bi-telecentric lens proposed by the utility model has high resolution and low distortion rate.

[0030] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A large field of view bi-telecentric lens, characterized in that: The optical amplification group and the imaging group are sequentially arranged from the object plane to the image plane, and the aperture stop is arranged between the optical amplification group and the imaging group, wherein: The optical magnification group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence from the object plane to the image plane, wherein the first lens is a concave-convex lens, the second lens is a concave-convex lens, the third lens is a plano-convex lens, the fourth lens is a concave-convex lens, the fifth lens is a concave-convex lens, the sixth lens is a concave-convex lens, the seventh lens is a concave-convex lens, and the eighth lens is a biconvex lens; The imaging group includes a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence from the object plane to the image plane, wherein the ninth lens is a biconvex lens, the tenth lens is a meniscus lens, the eleventh lens is a biconvex lens, and the twelfth lens is a biconcave lens.

2. A large field of view bi-telecentric lens as claimed in claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens are spherical lenses.

3. A large field of view bi-telecentric lens as claimed in claim 2, characterized in that: The curvature radius of the light incident surface of the first lens is -425.039×(1-5%)mm to -425.039×(1+5%)mm, and the curvature radius of the light exit surface of the first lens is -355.088×(1-5%)mm to -355.088×(1+5%)mm; The curvature radius of the light incident surface of the second lens is -1341.067×(1-5%)mm to -1341.067×(1+5%)mm, and the curvature radius of the light exit surface of the second lens is -716.032×(1-5%)mm to -716.032×(1+5%)mm; The curvature radius of the light incident surface of the third lens is 1092.987×(1-5%)mm~1092.987×(1+5%)mm, and the light exit surface of the third lens is a plane; The curvature radius of the light incident surface of the fourth lens is 440.641×(1-5%)mm to 440.641×(1+5%)mm, and the curvature radius of the light exit surface of the fourth lens is 798.885×(1-5%)mm to 798.885×(1+5%)mm; The curvature radius of the light incident surface of the fifth lens is 231.631×(1-5%)mm to 231.631×(1+5%)mm, and the curvature radius of the light exit surface of the fifth lens is 341.644×(1-5%)mm to 341.644×(1+5%)mm; The radius of curvature of the light incident surface of the sixth lens is 115.075×(1-5%) mm to 115.075×(1+5%) mm, and the radius of curvature of the light exit surface of the sixth lens is 136.834×(1-5%) mm to 136.834×(1+5%) mm; The curvature radius of the light incident surface of the seventh lens is 77.745×(1-5%)mm to 77.745×(1+5%)mm, and the curvature radius of the light exit surface of the seventh lens is 82.840×(1-5%)mm to 82.840×(1+5%)mm; The curvature radius of the light incident surface of the eighth lens is 164.258×(1-5%)mm to 164.258×(1+5%)mm, and the curvature radius of the light exit surface of the eighth lens is -116.744×(1-5%)mm to -116.744×(1+5%)mm; The curvature radius of the light incident surface of the ninth lens is 196.852×(1-5%)mm to 196.852×(1+5%)mm, and the curvature radius of the light exit surface of the ninth lens is -50.440×(1-5%)mm to -50.440×(1+5%)mm; The curvature radius of the light incident surface of the tenth lens is -446.013×(1-5%)mm to -446.013×(1+5%)mm, and the curvature radius of the light exit surface of the tenth lens is -74.813×(1-5%)mm to -74.813×(1+5%)mm; The curvature radius of the light incident surface of the eleventh lens is 57.166×(1-5%)mm to 57.166×(1+5%)mm, and the curvature radius of the light exit surface of the eleventh lens is -75.227×(1-5%)mm to -75.227×(1+5%)mm; The curvature radius of the light incident surface of the twelfth lens is -48.498×(1-5%)mm to -48.498×(1+5%)mm, and the curvature radius of the light exit surface of the twelfth lens is 104.523×(1-5%)mm to 104.523×(1+5%)mm.

4. A large field of view bi-telecentric lens as claimed in claim 2, characterized in that: The center thickness of the first lens is 13.998×(1-5%)mm to 13.998×(1+5%)mm; The central thickness of the second lens is 14.002×(1-5%)mm to 14.002×(1+5%)mm; The central thickness of the third lens is 14.805×(1-5%)mm to 14.805×(1+5%)mm; The center thickness of the fourth lens is 14.000×(1-5%)mm to 14.000×(1+5%)mm; The central thickness of the fifth lens is 14.001×(1-5%)mm to 14.001×(1+5%)mm; The central thickness of the sixth lens is 14.001×(1-5%)mm to 14.001×(1+5%)mm; The center thickness of the seventh lens is 7.842×(1-5%)mm to 7.842×(1+5%)mm; The central thickness of the eighth lens is 5.127×(1-5%)mm to 5.127×(1+5%)mm; The center thickness of the ninth lens is 7.842×(1-5%)mm to 7.842×(1+5%)mm; The central thickness of the tenth lens is 5.127×(1-5%)mm to 5.127×(1+5%)mm; The central thickness of the eleventh lens is 11.353×(1-5%)mm to 11.353×(1+5%)mm; The central thickness of the twelfth lens is 8.666×(1-5%) mm to 8.666×(1+5%) mm.

5. A large field of view bi-telecentric lens as claimed in claim 2, characterized in that: The distance between the first lens and the second lens in the air gap on the optical axis is 50.013×(1-5%)mm to 50.013×(1+5%)mm; The distance between the second lens and the third lens in the air gap on the optical axis is 50.026×(1-5%)mm to 50.026×(1+5%)mm; The distance between the air gap of the third lens and the fourth lens on the optical axis is 45.408×(1-5%)mm to 45.408×(1+5%)mm; The distance between the fourth lens and the fifth lens in the air gap on the optical axis is 48.017×(1-5%)mm to 48.017×(1+5%)mm; The distance between the fifth lens and the sixth lens in the air gap on the optical axis is 45.328×(1-5%)mm to 45.328×(1+5%)mm; The distance between the sixth lens and the seventh lens in the air gap on the optical axis is 50.000×(1-5%)mm to 50.000×(1+5%)mm; The distance between the seventh lens and the eighth lens in the air gap on the optical axis is 50.001×(1-5%)mm to 50.001×(1+5%)mm; The distance between the eighth lens and the aperture stop in the air on the optical axis is 19.387×(1-5%)mm to 19.387×(1+5%)mm; The distance between the aperture stop and the air gap of the ninth lens on the optical axis is 1.000×(1-5%)mm to 1.000×(1+5%)mm; The distance between the ninth lens and the tenth lens in the air gap on the optical axis is 0.500×(1-5%)mm to 0.500×(1+5%)mm; The distance between the tenth lens and the eleventh lens in the air gap on the optical axis is 0; The distance between the air gap of the eleventh lens and the twelfth lens on the optical axis is 3.063×(1-5%)mm to 3.063×(1+5%)mm; The distance between the twelfth lens and the image plane by air on the optical axis is 4.223×(1-5%)mm to 4.223×(1+5%)mm.

6. A large field of view bi-telecentric lens as claimed in claim 2, characterized in that: The refractive index of the first lens is 1.79; the refractive index of the second lens is 1.64; the refractive index of the third lens is 1.53; the refractive index of the fourth lens is 1.68; the refractive index of the fifth lens is 1.49; the refractive index of the sixth lens is 1.81; the refractive index of the seventh lens is 1.53; the refractive index of the eighth lens is 1.44; the refractive index of the ninth lens is 1.62; the refractive index of the tenth lens is 1.82; the refractive index of the eleventh lens is 1.72; and the refractive index of the twelfth lens is 1.

53.

7. A large field of view bi-telecentric lens as claimed in claim 2, characterized in that: The Abbe number of the first lens is 47.5×(1-5%)mm to 47.5×(1+5%)mm; The Abbe number of the second lens is 60.1×(1-5%)mm to 60.1×(1+5%)mm; The Abbe number of the third lens is 77.0×(1-5%)mm to 77.0×(1+5%)mm; The Abbe number of the fourth lens is 48.2×(1-5%)mm to 48.2×(1+5%)mm; The Abbe number of the fifth lens is 81.8×(1-5%)mm to 81.8×(1+5%)mm; The Abbe number of the sixth lens is 40.9×(1-5%)mm to 40.9×(1+5%)mm; The Abbe number of the seventh lens is 62.2×(1-5%)mm to 62.2×(1+5%)mm; The Abbe number of the eighth lens is 90.7×(1-5%)mm to 90.7×(1+5%)mm; The Abbe number of the ninth lens is 63.5×(1-5%)mm to 63.5×(1+5%)mm; The Abbe number of the tenth lens is 37.5×(1-5%)mm to 37.5×(1+5%)mm; The Abbe number of the eleventh lens is 48.0×(1-5%)mm to 48.0×(1+5%)mm; The Abbe number of the twelfth lens is 49.0×(1-5%)mm to 49.0×(1+5%)mm.

Images