High-resolution optical lens for spectral imaging

Abstract

The invention discloses a high-resolution optical lens for spectral imaging, and relates to the technical field of optical lenses, and the high-resolution optical lens for spectral imaging comprises a first lens, a second lens, a third lens, a fourth lens, a first bonding lens, a second bonding lens, a ninth lens and a tenth lens which are sequentially arranged from an object side to an image side. The first bonding lens comprises a fifth lens and a sixth lens; the second balsaming lens comprises a seventh lens and an eighth lens; by optimizing the shapes and the curvature radiuses of the lenses and the relative positions of the lenses, the effects of uniform imaging, high definition, large aperture and wide visual angle are achieved, and the problem that high resolution and high image quality are difficult to realize under the conditions of large visual field and high picture is solved.

Description

Technical Field

[0001] This application relates to the field of optical lens technology, and in particular to a high-resolution optical lens for spectral imaging. Background Technology

[0002] In fields such as spectral imaging, traditional industrial lenses typically rely on aspherical lenses or diffraction gratings, which are costly to manufacture and difficult to assemble, making them unsuitable for the miniaturization requirements of portable spectroscopic devices. Differences in the incident angle of light at different field-of-view angles under a large field of view lead to uneven spectral response and spectral shift at the edges of the field of view. Current optical lenses use limited glass materials and types, failing to cover a wide spectral range, exhibiting spectral curve distortion, and their MTF performance is insufficient to meet the demands for fine image quality. Summary of the Invention

[0003] The purpose of this application is to provide a high-resolution optical lens for spectral imaging, which can achieve uniform imaging, high clarity, large aperture and wide viewing angle, and solve the problem of difficulty in achieving high resolution and high image quality under large field of view and high frame.

[0004] To achieve the above objectives, this application provides the following solution:

[0005] This application provides a high-resolution optical lens for spectral imaging, comprising: a first lens, a second lens, a third lens, a fourth lens, a first cemented lens, a second cemented lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side; the first cemented lens includes a fifth lens and a sixth lens; the second cemented lens includes a seventh lens and an eighth lens; and an aperture stop is located between the sixth lens and the seventh lens.

[0006] Optionally, the first lens is a meniscus lens with negative optical power, wherein the object side is convex and the image side is concave.

[0007] The second lens is a meniscus lens with negative optical power, its object side is convex and its image side is concave.

[0008] The third lens is a biconcave lens with negative optical power, with both the object-side and image-side surfaces being concave.

[0009] The fourth lens is a meniscus lens with positive optical power, its object side is concave and its image side is convex.

[0010] The fifth lens is a meniscus lens with negative optical power, its object side is convex and its image side is concave.

[0011] The sixth lens is a biconvex lens with positive optical power, with both the object-side and image-side surfaces being convex.

[0012] The seventh lens is a biconvex lens with a positive optical power. Its object side is convex and its image side is convex;

[0013] The eighth lens is a biconcave lens with a negative optical power. Its object side is concave and its image side is concave;

[0014] The ninth lens is a biconvex lens with a positive optical power. Its object side is convex and its image side is convex;

[0015] The tenth lens is a meniscus lens with a negative optical power. Its object side is convex and its image side is concave.

[0016] Optionally, 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 and the tenth lens are spherical lenses.

[0017] Optionally, the materials of 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 and the tenth lens are glass.

[0018] Optionally, the total optical length of the high-resolution optical lens for spectral imaging is 0 < TTL ≤ 80 mm, the aperture number is 0 < F ≤ 2, the field angle is 0 < FOV ≤ 100°, the principal ray incident angle at the maximum image height is 0 < CRA ≤ 4°, and the focal length EFFL is 18 mm.

[0019] Optionally, the radius of curvature of the incident surface of the first lens is R1, 299 mm < R1 < 300 mm, and the radius of curvature of the exit surface of the first lens is R2, 74 mm < R2 < 75 mm;

[0020] The radius of curvature of the incident surface of the second lens is R3, 150 mm < R3 < 151 mm, and the radius of curvature of the exit surface of the second lens is R4, 13 mm < R4 < 14 mm;

[0021] The radius of curvature of the incident surface of the third lens is R5, 19 mm < R5 < 20 mm, and the radius of curvature of the exit surface of the third lens is R6, 82 mm < R6 < 83 mm;

[0022] The radius of curvature of the incident surface of the fourth lens is R7, 300 mm < R7 < 301 mm, and the radius of curvature of the exit surface of the fourth lens is R8, 31 mm < R8 < 32 mm;

[0023] The radius of curvature of the incident surface of the fifth lens is R9, 24 mm < R9 < 25 mm, and the radius of curvature of the exit surface of the fifth lens is R10, 14 mm < R10 < 15 mm;

[0024] The radius of curvature of the incident surface of the sixth lens is R10, and the radius of curvature of the exit surface of the sixth lens is R11, where 33mm < R11 < 34mm.

[0025] The radius of curvature of the incident surface of the seventh lens is R13, 58mm < R13 < 59mm, and the radius of curvature of the exit surface of the seventh lens is R14, 16mm < R14 < 17mm.

[0026] The radius of curvature of the incident surface of the eighth lens is R14, and the radius of curvature of the exit surface of the eighth lens is R15, 36mm < R15 < 37mm.

[0027] The radius of curvature of the incident surface of the ninth lens is R16, 35mm < R16 < 36mm, and the radius of curvature of the exit surface of the ninth lens is R17, 76mm < R17 < 77mm.

[0028] The radius of curvature of the incident surface of the tenth lens is R18, 42mm < R18 < 43mm, and the radius of curvature of the exit surface of the tenth lens is R19, 299mm < R19 < 300mm.

[0029] Optionally, the total focal length of the high-resolution optical lens used for spectral imaging is f, with the first lens having a focal length of f1, the second lens having a focal length of f2, the third lens having a focal length of f3, the fourth lens having a focal length of f4, the fifth lens having a focal length of f5, the sixth lens having a focal length of f6, the seventh lens having a focal length of f7, the eighth lens having a focal length of f8, the ninth lens having a focal length of f9, and the tenth lens having a focal length of f10, wherein: -6. 3<f1 / f<-6.2; -1.8<f2 / f<-1.7; -1.7<f3 / f<-1.6; 2.0<f4 / f<2.1; 2.9<f5 / f<3.0; -24. 0<f6 / f<-23.9; -13.9<f7 / f<-13.8; -3.9<f8 / f<-3.8; 2.3<f9 / f<2.4; 2.8<f10 / f<2.9.

[0030] Optionally, the central air gap between the first and second lenses is d1, the central air gap between the second and third lenses is d2, the central air gap between the third and fourth lenses is d3, and the central air gap between the fourth and fifth lenses is d4; the fifth and sixth lenses are cemented lenses with an air gap of 0; there is an aperture stop between the sixth and seventh lenses, with a central air gap of d5 between the sixth lens and the aperture stop, and a central air gap of d6 between the aperture stop and the seventh lens; the seventh and eighth lenses are cemented lenses with an air gap of 0; the eighth lens and the ninth lens... The central air gap between the lenses is d7, the central air gap between the ninth and tenth lenses is d8, and the central air gap between the tenth lens and the image plane is d9; where: 1.2mm < d1 < 1.3mm; 12.4mm < d2 < 12.5mm; 4.1mm < d3 < 4.2mm; 1.0mm < d4 < 1.1mm; 3.6mm < d5 < 3.7mm; 1.7mm < d6 < 1.8mm; 0.4mm < d7 < 0.5mm; 12.8mm < d8 < 12.9mm; 15.7mm < d9 < 15.8mm.

[0031] Optionally, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, the refractive index of the seventh lens is n7, the refractive index of the eighth lens is n8, the refractive index of the ninth lens is n9, and the refractive index of the tenth lens is n10; wherein: 1.8 < n1 < 1.9; 1.4 < n2 < 1.5; 1.5 < n3 < 1.6; 1.9 < n4 < 2.0; 1.8 < n5 < 1.9; 1.5 < n6 < 1.6; 1.5 < n7 < 1.6; 1.8 < n8 < 1.9; 1.5 < n9 < 1.6; 1.9 < n10 < 2.0.

[0032] Optionally, the dispersion coefficient of the first lens is v1, the dispersion coefficient of the second lens is v2, the dispersion coefficient of the third lens is v3, the dispersion coefficient of the fourth lens is v4, the dispersion coefficient of the fifth lens is v5, the dispersion coefficient of the sixth lens is v6, the dispersion coefficient of the seventh lens is v7, the dispersion coefficient of the eighth lens is v8, the dispersion coefficient of the ninth lens is v9, and the dispersion coefficient of the tenth lens is v10; wherein: 40.8 < v1 < 40.9; 90.3 < v2 < 90.4; 64.2 < v3 < 64.3; 32.3 < v4 ​​< 32.4; 40.8 < v5 < 40.9; 71.3 < v6 < 71.4; 71.3 < v7 < 71.4; 25.5 < v8 < 25.6; 71.3 < v9 < 71.4; 17.5 < v10 < 17.6.

[0033] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0034] This application provides a high-resolution optical lens for spectral imaging. The optical lens includes a first lens, a second lens, a third lens, a fourth lens, a first cemented lens, a second cemented lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side. The first cemented lens includes a fifth lens and a sixth lens; the second cemented lens includes a seventh lens and an eighth lens; and an aperture stop is located between the sixth lens and the seventh lens. By optimizing the shape, radius of curvature, and relative positions of each lens, the lens achieves uniform imaging, high clarity, a large aperture, and a wide viewing angle, solving the problem of achieving high resolution and high image quality under large field of view and high format. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a high-resolution optical lens for spectral imaging provided in one embodiment of this application.

[0037] Figure 2 This is a layout diagram of a high-resolution optical lens for spectral imaging provided in one embodiment of this application.

[0038] Figure 3 This is a dot plot of the object side and image side of a high-resolution optical lens for spectral imaging, provided as an embodiment of this application.

[0039] Figure 4 This is a schematic diagram of the polychromatic light diffraction MTF value of a high-resolution optical lens for spectral imaging provided in an embodiment of this application.

[0040] Figure 5 This is a schematic diagram of the optical path difference of a high-resolution optical lens for spectral imaging, provided as an embodiment of this application.

[0041] Figure 6 This is a schematic diagram of axial aberration of a high-resolution optical lens for spectral imaging provided in an embodiment of this application.

[0042] Figure 7 This is a schematic diagram of the relative illumination of a high-resolution optical lens for spectral imaging, provided as an embodiment of this application. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, a high-resolution optical lens for spectral imaging is provided, comprising: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a first cemented lens, a second cemented lens, a ninth lens L9, and a tenth lens L10 arranged sequentially from the object side to the image side; the first cemented lens includes a fifth lens L5 and a sixth lens L6; the second cemented lens includes a seventh lens L7 and an eighth lens L8; and an aperture stop (STOP) is located between the sixth lens L6 and the seventh lens L7.

[0046] Gluing: refers to the process of bonding two lens surfaces of different materials (usually high-refractive-index crown glass and low-refractive-index flint glass) together using optical adhesives (such as photosensitive adhesives, thermosetting adhesives, etc.) to form an optical whole.

[0047] STOP: An aperture stop in an optical system that limits the width of the imaging beam for an on-axis object point. It determines the effective aperture and numerical aperture, and affects the imaging brightness, resolution, and aberrations. The light flux can be controlled by adjusting its size.

[0048] The high-resolution optical lens for spectral imaging provided in this application is a fixed-focus imaging lens. It adopts an optical system structure of 10 elements in 8 groups. By optimizing the shape, radius of curvature of each lens and the relative position between each lens, it finally achieves an aperture of 2, a maximum field of view of 100°, a total length of less than or equal to 80mm, and a focal length of 18mm, which meets the requirements of large aperture, ultra-wide angle and high image quality.

[0049] The first lens L1 is a meniscus lens with negative optical power, its object side is convex and its image side is concave.

[0050] The second lens L2 is a meniscus lens with negative optical power, its object side is convex and its image side is concave.

[0051] The third lens L3 is a biconcave lens with negative optical power, with both the object side and the image side being concave.

[0052] The fourth lens, L4, is a meniscus lens with positive optical power. Its object side is concave and its image side is convex.

[0053] The fifth lens, L5, is a meniscus lens with negative optical power. Its object side is convex and its image side is concave.

[0054] The sixth lens, L6, is a biconvex lens with positive optical power, and its object-side surface is convex, and its image-side surface is convex.

[0055] The seventh lens, L7, is a biconvex lens with positive optical power, and its object-side surface is convex, and its image-side surface is convex.

[0056] The eighth lens, L8, is a biconcave lens with negative optical power, with both the object-side and image-side surfaces being concave.

[0057] The ninth lens, L9, is a biconvex lens with positive optical power, and its object-side surface is convex, and its image-side surface is convex.

[0058] The tenth lens, L10, is a meniscus lens with negative optical power. Its object side is convex, and its image side is concave.

[0059] Optical power: A physical quantity characterizing the refractive power of an optical system, defined as the difference between the convergence of the image-side beam and the convergence of the object-side beam. Its absolute value is positively correlated with the light-bending ability; the larger the absolute value, the stronger the converging or diverging effect on light, and vice versa. The sign of optical power reflects the beam characteristics: positive values ​​correspond to converging refraction, i.e., convex lenses, while negative values ​​correspond to diverging refraction, i.e., concave lenses. Optical power can be used to describe the refractive characteristics of a single refractive surface of a lens, a single lens, or an optical system (lens group) composed of multiple lenses.

[0060] Lenses L1, L2, L3, L4, L5, L6, L7, L8, L9, and L10 are spherical lenses. Spherical lenses have a single curvature, eliminating the need for complex aspherical equation fitting, resulting in low processing costs, high production yield, symmetrical and uniform structure, and reduced susceptibility to edge aberrations due to processing errors.

[0061] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the tenth lens L10 are glass. All the above lenses are glass lenses. Glass lenses have a wide range of refractive index changes and low dispersion coefficients, which can effectively suppress chromatic aberration and meet the requirements of high-resolution imaging, enabling the optical system to have good optical quality and stability, ensuring high-quality imaging. At the same time, they still maintain stable optical performance at high temperatures, are not easily distorted due to thermal deformation, and have the ability to resist chemical corrosion and moisture, and can maintain consistent imaging quality for a long time. In addition, glass is easy to be processed into shape and subjected to optical coating treatment, which helps to further improve the optical performance and anti-reflection ability.

[0062] The overall optical length of the high-resolution optical lens for spectral imaging is 0 < TTL ≤ 80 mm, the aperture number is 0 < F ≤ 2, the field angle is 0 < FOV ≤ 100°, the principal ray incident angle at the maximum image height is 0 < CRA ≤ 4°, and the focal length EFFL is 18 mm.

[0063] The radius of curvature of each lens of the optical system satisfies the following conditions:

[0064] The radius of curvature of the incident surface of the first lens L1 is R1, 299 mm < R1 < 300 mm, and the radius of curvature R2 of the exit surface of the first lens L1 is 74 mm < R2 < 75 mm;

[0065] The radius of curvature of the incident surface of the second lens L2 is R3, 150 mm < R3 < 151 mm, and the radius of curvature R4 of the exit surface of the second lens L2 is 13 mm < R4 < 14 mm;

[0066] The radius of curvature of the incident surface of the third lens L3 is R5, 19 mm < R5 < 20 mm, and the radius of curvature R6 of the exit surface of the third lens L3 is 82 mm < R6 < 83 mm;

[0067] The radius of curvature of the incident surface of the fourth lens L4 is R7, 300 mm < R7 < 301 mm, and the radius of curvature R8 of the exit surface of the fourth lens L4 is 31 mm < R8 < 32 mm;

[0068] The radius of curvature of the incident surface of the fifth lens L5 is R9, 24 mm < R9 < 25 mm, and the radius of curvature R10 of the exit surface of the fifth lens L5 is 14 mm < R10 < 15 mm;

[0069] The radius of curvature of the incident surface of the sixth lens L6 is R10, and the radius of curvature of the exit surface of the sixth lens L6 is R11, 33 mm < R11 < 34 mm;

[0070] The radius of curvature of the incident surface of the seventh lens L7 is R13, 58mm < R13 < 59mm, and the radius of curvature of the exit surface of the seventh lens L7 is R14, 16mm < R14 < 17mm.

[0071] The radius of curvature of the incident surface of the eighth lens L8 is R14, and the radius of curvature of the exit surface of the eighth lens L8 is R15, 36mm < R15 < 37mm.

[0072] The radius of curvature of the incident surface of the ninth lens L9 is R16, 35mm < R16 < 36mm, and the radius of curvature of the exit surface of the ninth lens L9 is R17, 76mm < R17 < 77mm.

[0073] The radius of curvature of the incident surface of the tenth lens L10 is R18, 42mm < R18 < 43mm, and the radius of curvature of the exit surface of the tenth lens L10 is R19, 299mm < R19 < 300mm.

[0074] The total focal length of the high-resolution optical lens used for spectral imaging is f. The focal lengths of the first lens L1, L2, L3, L4, L5, L6, L7, L8, L9, and L10 are f1, f1, f1, f2, f3, f4, f5, f6, f6, f7, f8, f9, f9, and f10 respectively. 0, among which: -6.3<f1 / f<-6.2; -1.8<f2 / f<-1.7; -1.7<f3 / f<-1.6; 2.0<f4 / f<2.1; 2.9<f5 / f<3.0; -24.0<f6 / f<-23.9; -13.9<f7 / f<-13.8; -3.9<f8 / f<-3.8; 2.3<f9 / f<2.4; 2.8<f10 / f<2.9.

[0075] The central air gap between the first lens L1 and the second lens L2 is d1; the central air gap between the second lens L2 and the third lens L3 is d2; the central air gap between the third lens L3 and the fourth lens L4 is d3; and the central air gap between the fourth lens L4 and the fifth lens L5 is d4. The fifth lens L5 and the sixth lens L6 are cemented lenses with an air gap of 0. There is an aperture stop (STOP) between the sixth lens L6 and the seventh lens L7. The central air gap between the sixth lens L6 and the aperture stop (STOP) is d5, and the central air gap between the aperture stop (STOP) and the seventh lens L7 is d6. The seventh lens L7 and the eighth lens L8 are cemented lenses. The air gap is 0; the center air gap between the eighth lens L8 and the ninth lens L9 is d7, the center air gap between the ninth lens L9 and the tenth lens L10 is d8, and the center air gap between the tenth lens L10 and the image plane is d9; where: 1.2mm < d1 < 1.3mm; 12.4mm < d2 < 12.5mm; 4.1mm < d3 < 4.2mm; 1.0mm < d4 < 1.1mm; 3.6mm < d5 < 3.7mm; 1.7mm < d6 < 1.8mm; 0.4mm < d7 < 0.5mm; 12.8mm < d8 < 12.9mm; 15.7mm < d9 < 15.8mm.

[0076] The refractive index of a lens is its ability to refract light. When the refractive index is high, the light is refracted at a larger angle within the lens, resulting in a stronger focusing effect and a shorter focal length. At the same time, the refractive index affects the chromatic aberration performance of the lens. A high-refractive-index lens will exacerbate the chromatic aberration effect, meaning that different wavelengths of light are refracted to different degrees within the lens, leading to different focusing positions and producing chromatic aberration during imaging.

[0077] The refractive index of the first lens L1 is n1, the refractive index of the second lens L2 is n2, the refractive index of the third lens L3 is n3, the refractive index of the fourth lens L4 is n4, the refractive index of the fifth lens L5 is n5, the refractive index of the sixth lens L6 is n6, the refractive index of the seventh lens L7 is n7, the refractive index of the eighth lens L8 is n8, the refractive index of the ninth lens L9 is n9, and the refractive index of the tenth lens L10 is n10; where: 1.8 < n1 < 1.9; 1.4 < n2 < 1.5; 1.5 < n3 < 1.6; 1.9 < n4 < 2.0; 1.8 < n5 < 1.9; 1.5 < n6 < 1.6; 1.5 < n7 < 1.6; 1.8 < n8 < 1.9; 1.5 < n9 < 1.6; 1.9 < n10 < 2.0.

[0078] The dispersion coefficient (Abbe number) of lens glass material is a parameter that measures the degree to which the glass disperses light of different wavelengths. The larger the value, the smaller the dispersion and the stronger the ability to correct chromatic aberration.

[0079] The dispersion coefficient of the first lens L1 is v1, the second lens L2 is v2, the third lens L3 is v3, the fourth lens L4 is v4, the fifth lens L5 is v5, the sixth lens L6 is v6, the seventh lens L7 is v7, the eighth lens L8 is v8, the ninth lens L9 is v9, and the tenth lens L10... The dispersion coefficient is v10; where: 40.8 < v1 < 40.9; 90.3 < v2 < 90.4; 64.2 < v3 < 64.3; 32.3 < v4 ​​< 32.4; 40.8 < v5 < 40.9; 71.3 < v6 < 71.4; 71.3 < v7 < 71.4; 25.5 < v8 < 25.6; 71.3 < v9 < 71.4; 17.5 < v10 < 17.6.

[0080] Detailed parameters for the object-side and image-side surfaces are shown in Table 1. Rows 1-11 of the table provide detailed parameters for the light-receiving surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the fifth lens L5 (and the sixth lens L6), and the sixth lens L6, respectively. Row 12 provides detailed parameters for the aperture stop (STOP). Rows 13-19 provide detailed parameters for the light-receiving surfaces of the seventh lens L7, the seventh lens L7 (and the eighth lens L8), the eighth lens L8, the ninth lens L9, the ninth lens L9, the tenth lens L10, and the tenth lens L10. Detailed parameters include radius of curvature, thickness, refractive index of the glass material, and Abbe number.

[0081] Table 1. Detailed parameters of the object side and image side.

[0082]

[0083]

[0084] Specific performance characteristics are as follows: Figures 3-7 As shown, the point-to-point plot is as follows: Figure 3 As shown, the MTF value of polychromatic light diffraction is as follows: Figure 4 As shown, the optical path difference is as follows Figure 5 As shown, axial aberrations are as follows Figure 6 As shown, the relative illuminance is as follows Figure 7 As shown.

[0085] The high-resolution optical lens for spectral imaging provided in this application can be applied to scenarios requiring wide-band (the high-resolution optical lens for spectral imaging provided in this application can be used in a wider band range of 434-656nm) and high-precision spectral imaging, such as industrial visual inspection equipment, hyperspectral imagers, multispectral cameras, remote sensing spectral detection equipment, and biomedical spectral analysis systems. It has the following advantages:

[0086] 1. The high-resolution optical lens for spectral imaging provided in this application provides uniform imaging, high clarity, large aperture (F2), and wide viewing angle (maximum field of view 100°).

[0087] 2. The high-resolution optical lens for spectral imaging provided in this application employs two sets of cemented doublet lenses, which makes the colors of the optical imaging system clear and has good color reproduction and image plane reproduction.

[0088] 3. All lenses in the high-resolution optical lens for spectral imaging provided in this application are spherical lenses, and all are made of glass, which is relatively stable and can adapt to certain environmental changes, while reducing costs to a certain extent.

[0089] 4. The high-resolution optical lens for spectral imaging provided in this application has a reasonable configuration and combination of various lenses, which solves the problem of achieving high resolution and high image quality under large field of view and high frame size. At the same time, it is easy to assemble, has low tolerance sensitivity, and is more suitable for large-scale high-yield production.

[0090] 5. The high-resolution optical lens for spectral imaging provided in this application corrects aberrations at all levels, ensuring that the imaging system has high imaging quality (MTF > 0.6 at 60 lp / mm).

[0091] 6. The high-resolution optical lens for spectral imaging provided in this application has a telecentricity of ≤5°, which can effectively reduce perspective error and improve the accuracy of dimensional measurement in spectral imaging scenarios. Telecentricity: an indicator that measures the parallelism between the principal ray and the optical axis of an optical system. Low telecentricity can reduce perspective error and improve the accuracy of dimensional measurement in machine vision.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A high-resolution optical lens for spectral imaging, characterized in that, The high-resolution optical lens for spectral imaging includes: a first lens, a second lens, a third lens, a fourth lens, a first cemented lens, a second cemented lens, a ninth lens, and a tenth lens arranged in sequence from the object side to the image side; the first cemented lens includes a fifth lens and a sixth lens; the second cemented lens includes a seventh lens and an eighth lens; the aperture stop is located between the sixth lens and the seventh lens.

2. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The first lens is a meniscus lens with a negative focal power, its object side is convex, and its image side is concave. The second lens is a meniscus lens with a negative focal power, its object side is convex, and its image side is concave. The third lens is a biconcave lens with a negative focal power, its object side is concave, and its image side is concave. The fourth lens is a meniscus lens with a positive focal power, its object side is concave, and its image side is convex. The fifth lens is a meniscus lens with a negative focal power, its object side is convex, and its image side is concave. The sixth lens is a biconvex lens with a positive focal power, its object side is convex, and its image side is convex. The seventh lens is a biconvex lens with a positive focal power, its object side is convex, and its image side is convex. The eighth lens is a biconcave lens with a negative focal power, its object side is concave, and its image side is concave. The ninth lens is a biconvex lens with a positive focal power, its object side is convex, and its image side is convex. The tenth lens is a meniscus lens with a negative focal power, its object side is convex, and its image side is concave.

3. The high-resolution optical lens for spectral imaging according to 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, and the tenth lens are spherical lenses.

4. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The materials of 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, and the tenth lens are glass.

5. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The optical total length of the high-resolution optical lens for spectral imaging is 0 < TTL ≤ 80 mm, the f-number is 0 < F ≤ 2, the field angle is 0 < FOV ≤ 100°, the chief ray angle of incidence at the maximum image height is 0 < CRA ≤ 4°, and the focal length EFFL is 18 mm.

6. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The radius of curvature of the incident light surface of the first lens is R1, 299 mm < R1 < 300 mm, and the radius of curvature R2 of the outgoing light surface of the first lens, 74 mm < R2 < 75 mm; The radius of curvature of the incident light surface of the second lens is R3, 150 mm < R3 < 151 mm, and the radius of curvature R4 of the outgoing light surface of the second lens, 13 mm < R4 < 14 mm; The radius of curvature of the incident light surface of the third lens is R5, 19 mm < R5 < 20 mm, and the radius of curvature R6 of the outgoing light surface of the third lens, 82 mm < R6 < 83 mm; The radius of curvature of the incident light surface of the fourth lens is R7, 300 mm < R7 < 301 mm, and the radius of curvature R8 of the outgoing light surface of the fourth lens, 31 mm < R8 < 32 mm; The radius of curvature of the incident light surface of the fifth lens is R9, 24 mm < R9 < 25 mm, and the radius of curvature R10 of the outgoing light surface of the fifth lens, 14 mm < R10 < 15 mm; The radius of curvature of the incident surface of the sixth lens is R10, and the radius of curvature of the exit surface of the sixth lens is R11, where 33mm < R11 < 34mm. The radius of curvature of the incident surface of the seventh lens is R13, 58mm < R13 < 59mm, and the radius of curvature of the exit surface of the seventh lens is R14, 16mm < R14 < 17mm. The radius of curvature of the incident surface of the eighth lens is R14, and the radius of curvature of the exit surface of the eighth lens is R15, 36mm < R15 < 37mm. The radius of curvature of the incident surface of the ninth lens is R16, 35mm < R16 < 36mm, and the radius of curvature of the exit surface of the ninth lens is R17, 76mm < R17 < 77mm. The radius of curvature of the incident surface of the tenth lens is R18, 42mm < R18 < 43mm, and the radius of curvature of the exit surface of the tenth lens is R19, 299mm < R19 < 300mm.

7. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The total focal length of the high-resolution optical lens used for spectral imaging is f. The focal lengths of the first lens are f1, the second lens is f2, the third lens is f3, the fourth lens is f4, the fifth lens is f5, the sixth lens is f6, the seventh lens is f7, the eighth lens is f8, the ninth lens is f9, and the tenth lens is f10, where -6.3 < f1 / f<-6.2;-1.8<f2 / f<-1.7;-1.7<f3 / f<-1.6; 2.0<f4 / f<2.1; 2.9<f5 / f<3.0;-24.0 <f6 / f<-23.9; -13.9<f7 / f<-13.8; -3.9<f8 / f<-3.8; 2.3<f9 / f<2.4; 2.8<f10 / f<2.

9.

8. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The central air gap between the first and second lenses is d1; the central air gap between the second and third lenses is d2; the central air gap between the third and fourth lenses is d3; and the central air gap between the fourth and fifth lenses is d4. The fifth and sixth lenses are cemented lenses with an air gap of 0. There is an aperture stop between the sixth and seventh lenses; the central air gap between the sixth lens and the aperture stop is d5; the central air gap between the aperture stop and the seventh lens is d6. The seventh and eighth lenses are cemented lenses with an air gap of 0. The eighth and ninth lenses... The central air gap between the lenses is d7, the central air gap between the ninth and tenth lenses is d8, and the central air gap between the tenth lens and the image plane is d9; where: 1.2mm < d1 < 1.3mm; 12.4mm < d2 < 12.5mm; 4.1mm < d3 < 4.2mm; 1.0mm < d4 < 1.1mm; 3.6mm < d5 < 3.7mm; 1.7mm < d6 < 1.8mm; 0.4mm < d7 < 0.5mm; 12.8mm < d8 < 12.9mm; 15.7mm < d9 < 15.8mm.

9. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, the refractive index of the seventh lens is n7, the refractive index of the eighth lens is n8, the refractive index of the ninth lens is n9, and the refractive index of the tenth lens is n10; where: 1.8 < n1 < 1.9; 1.4 < n2 < 1.5; 1.5 < n3 < 1.6; 1.9 < n4 < 2.0; 1.8 < n5 < 1.9; 1.5 < n6 < 1.6; 1.5 < n7 < 1.6; 1.8 < n8 < 1.9; 1.5 < n9 < 1.6; 1.9 < n10 < 2.

0.

10. The high-resolution optical lens for spectral imaging according to claim 1, characterized in that, The dispersion coefficients of the first lens are v1, the second lens is v2, the third lens is v3, the fourth lens is v4, the fifth lens is v5, the sixth lens is v6, the seventh lens is v7, the eighth lens is v8, the ninth lens is v9, and the tenth lens is v10; where: 40.8 < v1 < 40.9; 90.3 < v2 < 90.4; 64.2 < v3 < 64.3; 32.3 < v4 ​​< 32.4; 40.8 < v5 < 40.9; 71.3 < v6 < 71.4; 71.3 < v7 < 71.4; 25.5 < v8 < 25.6; 71.3 < v9 < 71.4; 17.5 < v10 < 17.6.

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