Optical lens, camera device and industrial detection equipment considering large field of view and imaging quality

Abstract

The application discloses an optical lens, a camera device and industrial detection equipment with large field of view and imaging quality, wherein ten lenses with positive-negative-positive-negative-positive-negative-positive-negative-negative focal lengths are arranged in the order from the object plane to the image plane; the object side of the second, sixth and seventh lenses and the image side of the third, ninth and tenth lenses are convex near the optical axis; the image side of the second, sixth and eighth lenses and the object side of the third and ninth lenses are concave near the optical axis; the fourth lens is double-concave; the fifth lens is double-convex; the total focal length of the lens is 16.2-17.4 mm, the maximum field of view is 50-61 degrees, the optical axis distance from the object side of the third lens to the image side of the fifth lens is 10-15 mm, and the optical axis distance from the image side of the fifth lens to the object side of the sixth lens is 0.08-1.7 mm. The optical lens provided by the application has large field of view and imaging quality.

Description

Technical Field

[0001] This invention relates to the field of optics, and more particularly to an optical lens, imaging device, and industrial testing equipment that balances a large field of view and imaging quality. Background Technology

[0002] With the rapid development of intelligent manufacturing and machine vision technology, the performance requirements of industrial automated optical inspection (AOI) equipment for imaging systems are becoming increasingly stringent. This type of equipment is widely used in semiconductor packaging, printed circuit board (PCB) assembly, electronic component appearance inspection, and precision dimensional measurement, and its imaging quality directly determines the inspection accuracy, false positive rate, and production efficiency.

[0003] Industrial inspection lenses typically need to balance high resolution, low distortion, good illumination uniformity, and stable image quality within a limited working distance (e.g., 150mm to 500mm). However, existing industrial lenses still have many shortcomings in the synergistic optimization of these performance indicators.

[0004] Firstly, regarding aberration correction, traditional industrial inspection lenses often employ Gaussian or double-Gaussian structures. While these can balance spherical and coma to some extent, their field of view is typically small. To achieve a larger field of view and sufficient back-working distance, some designs utilize anti-telephoto structures. However, these lenses often suffer from significant field curvature and marked attenuation of the MTF (modulation transfer function) at the edges of the field of view, making it difficult to meet the high-precision inspection requirements for large fields of view.

[0005] Secondly, regarding chromatic aberration correction, most existing industrial lenses employ conventional cemented doublet lenses for achromatic processing. While this design can effectively correct the primary spectrum, its ability to suppress the secondary spectrum is limited. Under multi-wavelength LED light sources or wide-band white light illumination, residual axial and magnification chromatic aberrations may result in noticeable colored fringing at image edges, thereby affecting the accuracy of visual inspection and the reliability of image recognition.

[0006] Furthermore, in terms of structural compactness and manufacturability, existing high-performance industrial lenses often improve image quality by increasing the number of lenses or using aspherical lenses. However, an excessive number of lenses not only increases the length of the lens barrel and manufacturing costs, but also introduces higher eccentricity sensitivity and assembly difficulty due to excessive air gaps, which is detrimental to the consistency control of mass production. Although aspherical lenses used in some designs have certain advantages in aberration correction, their processing costs are high, and their thermal stability in high and low temperature environments is poor, limiting their widespread application in harsh industrial environments.

[0007] The disclosure of the above background technical content is only for the purpose of assisting in understanding the concept and technical solution of this application, and does not necessarily provide technical instruction. Summary of the Invention

[0008] The purpose of this invention is to provide an optical lens, imaging device, and industrial inspection equipment that balances a large field of view and imaging quality, meeting the imaging quality requirements of high resolution, low distortion, low chromatic aberration, and high illumination uniformity.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An optical lens comprising ten lenses with optical power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object plane to the image plane. The first lens has positive optical power; The object-side surfaces of the second and sixth lenses are convex near the optical axis, and their image-side surfaces are concave near the optical axis. The second lens also has negative optical power. The object-side surfaces of the third and ninth lenses are concave near the optical axis, and their image-side surfaces are convex near the optical axis. The third lens has positive optical power, and the ninth lens has negative optical power. The object-side surface and its image-side surface of the fourth lens are both concave near the optical axis. The object-side surface and its image-side surface of the fifth lens are both convex near the optical axis. The object-side surface of the seventh lens and the image-side surface of the tenth lens are convex near the optical axis, and the seventh lens and the tenth lens have positive optical power. The image-side surface of the eighth lens is concave near the optical axis and has negative optical power. The optical lens satisfies: 16.2mm ≤ f ≤17.4mm, 50°≤ Fov ≤61°, and the optical axis distance from the object side of the third lens to the image side of the fifth lens is between 10mm and 15mm, and the optical axis distance from the image side of the fifth lens to the object side of the sixth lens is between 0.08mm and 1.7mm, wherein, f This refers to the entire focal length of the lens. Fov This is the maximum field of view of the lens.

[0010] Furthermore, based on any one or a combination of the aforementioned technical solutions, the optical lens satisfies: 54mm ≤ TTL ≤62mm, 3.1≤ TTL / f ≤3.9, where, TTLIt is the distance on the optical axis from the vertex of the object side of the first lens to the imaging surface.

[0011] Furthermore, in accordance with any one or a combination of the aforementioned technical solutions, among the ten lenses with optical power, the seventh lens is the positive lens with the highest optical power, and its focal length is between 7.2mm and 9.7mm.

[0012] Furthermore, following any one or a combination of the aforementioned technical solutions, the third lens, the fourth lens, and the fifth lens constitute a cemented lens, wherein the difference between the Abbe constant of the third lens and the Abbe constant of the fourth lens is between 25 and 40, and the absolute value of the difference between the Abbe constants of the fourth lens and the fifth lens is not greater than 10.

[0013] Furthermore, based on any one or a combination of the aforementioned technical solutions, The center thickness of the fifth lens is between 3.3 mm and 4.9 mm; and / or, The radius of curvature of the third lens satisfies: -21.5mm ≤ r 31 ≤-19.2mm, -10.3mm≤ r 32 ≤-7.9mm, where, r 31 Let be the radius of curvature of the object-side surface of the third lens. r 32 The radius of curvature of the image-side surface of the third lens; and / or, The radius of curvature of the fifth lens satisfies: -26.4mm≤ r 52 ≤-22.5mm, where, r 52 Let be the radius of curvature of the image-side surface of the third lens.

[0014] Furthermore, following any one or a combination of the foregoing technical solutions, the optical axis distance from the image-side surface of the seventh lens to the object-side surface of the eighth lens is between 0.95 mm and 2.3 mm, the optical axis distance from the image-side surface of the seventh lens to the imaging surface is between 17 mm and 22 mm, and the center thickness of the eighth lens is between 0.6 mm and 1.1 mm; and / or, The optical axis distance from the object-side surface of the ninth lens to the image-side surface of the tenth lens is between 3.2 mm and 4.6 mm, and the optical axis distance from the object-side surface of the tenth lens to the imaging surface is between 8.5 mm and 9.5 mm; and / or, The center thickness of the nine lenses is 0.75 mm to 1.0 mm; and / or, The sixth and seventh lenses constitute a cemented lens, and the difference between the Abbe constant of the sixth lens and the Abbe constant of the seventh lens is not less than 35.

[0015] Furthermore, based on any one or a combination of the aforementioned technical solutions, the focal length of each lens satisfies the following condition: 3.03 ≤ f 1 / f ≤10.4, -1.77≤ f 2 / f ≤-1.08, 0.99≤ f 3 / f ≤1.76, -0.83≤ f 4 / f ≤-0.26, 0.50≤ f 5 / f ≤1.13, -1.68≤ f 6 / f ≤-1.12, 0.33≤ f 7 / f ≤0.75, -1.75≤ f 8 / f ≤-1.14, -3.36≤ f 9 / f ≤-2.38, 0.80≤ f 10 / f ≤1.26, where, f 1 is the focal length of the first lens ，f 2 represents the focal length of the second lens. f 3 is the focal length of the third lens ，f 4 represents the focal length of the fourth lens. f 5 represents the focal length of the fifth lens. f 6 represents the focal length of the sixth lens. f 7 is the focal length of the seventh lens. f 8 represents the focal length of the eighth lens. f 9 is the focal length of the ninth lens. f 10 This is the focal length of the tenth lens.

[0016] Furthermore, based on any one or a combination of the aforementioned technical solutions, the radius of curvature of the third lens satisfies: 0.6 ≤ r 31 / r 32 ≤2.8, where, r 31 Let be the radius of curvature of the object-side surface of the third lens. r 32 Let be the radius of curvature of the image-side surface of the third lens; The radius of curvature of the sixth lens satisfies: 1.7 ≤ r 61 / r 62 ≤3, where, r 61 Let be the radius of curvature of the object-side surface of the sixth lens. r 62 Let be the radius of curvature of the image-side surface of the sixth lens; The radius of curvature of the ninth lens satisfies: 1.0 ≤ r 92 / r 91 ≤1.6, where, r 91 Let be the radius of curvature of the object-side surface of the ninth lens. r 92 Let be the radius of curvature of the image-side surface of the ninth lens; The radius of curvature of the tenth lens satisfies: 7.8 ≤ | r 101 / r 102 |≤9.0, where, r 101 Let be the radius of curvature of the object-side surface of the tenth lens. r 102 Let be the radius of curvature of the image-side surface of the tenth lens.

[0017] Furthermore, based on any one or a combination of the aforementioned technical solutions, the lens satisfies: 1.28≤ Fov / Y m / 2≤1.76, where, Fov The maximum field of view of the lens. Y m The image height corresponding to the maximum field of view; And / or, 31.4≤ Y 1×180 / pi ≤38.7, where, Y 1 represents the lens image height when the half-field of view is 1°. pi Pi; And / or, 0.03≤ Fov / (2× D 1) / TTL ≤0.05, where 2× D 1 is the effective diameter of the first lens. Fov This is the maximum field of view of the lens.

[0018] Furthermore, based on any one or a combination of the aforementioned technical solutions, the lens satisfies: 9.0mm≤ bfl ≤17.9mm, of which, bfl This is the shortest distance from the image-side surface of the tenth lens to the imaging surface; And / or, 0.12≤ bfl / TTL ≤0.31, where, bfl This is the shortest distance from the image-side surface of the tenth lens to the imaging surface. TTL The distance on the optical axis is from the vertex of the object side of the first lens to the imaging surface; And / or, 0.22≤ Y m / TTL ≤0.43, where, Y m The image height corresponding to the maximum field of view. TTL The distance on the optical axis is from the vertex of the object side of the first lens to the imaging surface; And / or, 1.0 ≤ 2 × D 1 / f ≤1.6, where 2× D 1 represents the effective diameter of the first lens; And / or, 0.58≤ bfl / f ≤0.95, where, bfl It is the shortest distance from the image side of the tenth lens to the imaging surface.

[0019] Furthermore, based on any one or a combination of the aforementioned technical solutions, the lens satisfies: 17.8mm≤ Y m ≤18.4mm, where, Y m The image height corresponding to the maximum field of view; And / or, 0.54mm≤ Y 1≤0.68mm, where, Y 1 represents the lens image height when the half-field angle is 1°; And / or, 19.5mm≤2× D 1≤23.6mm, where 2× D 1 represents the effective diameter of the first lens.

[0020] Furthermore, in accordance with any or a combination of the aforementioned technical solutions, the optical lens further includes an aperture stop disposed between the seventh lens and the eighth lens, wherein the optical axis distance between the aperture stop and the object side surface of the eighth lens is adjustable within the range of 0.6 mm to 1.9 mm; And / or, the optical lens further includes a filter disposed between the tenth lens and the imaging surface, the optical axis distance between the filter and the imaging surface being adjustable in the range of 0.85 mm to 7.1 mm.

[0021] Furthermore, in accordance with any or a combination of the aforementioned technical solutions, the ten lenses of the optical lens having optical power are all spherical mirrors.

[0022] According to another aspect of the present invention, a camera device is provided, including an electronic photosensitive element and an optical lens as described above.

[0023] According to another aspect of the present invention, an industrial inspection device is provided, including an image processor and a camera device as described in any one or a combination of the above technical solutions.

[0024] The beneficial effects of the technical solution provided by this invention are as follows: a. The optical lens of the present invention achieves a balance between a large field of view and imaging quality by adopting a ten-element lens structure with alternating specific optical power of "positive-negative-positive-negative-positive-negative-positive-negative-positive", avoiding high-order spherical aberration loss, and is beneficial to flat field and off-axis image quality. Combined with the configuration of the lens focal length and the corresponding optical axis distances of the third to sixth lenses, it can achieve a near-flat image plane and maintain good MTF even at large image height, laying the foundation for the lens to meet industrial testing requirements. b. The optical lens provided by this invention places the seventh lens with the highest optical power in the middle and rear position, and closely arranges it with the seventh and eighth lenses. This can effectively collect and straighten large-angle light rays, significantly reduce the aperture and incident angle of subsequent lenses, thereby effectively controlling coma, astigmatism and field curvature. It can improve the uniformity of image quality at the edge and center, ensure image quality, and help to reserve sufficient rear working distance for the sensor while compressing the overall length. This facilitates the installation of components such as filters and mechanical shutters, and can improve the mechanical compatibility and practicality of the lens. c. By cementing the third to fifth lenses, this invention can suppress chromatic aberration at its source and prevent it from being transmitted to the rear group, thus reducing the burden on subsequent aberration correction. Furthermore, the three cemented lenses provide more freedom in glass pairing, achieving better chromatic aberration correction with a relatively small number of lenses. In addition, the cementing of the seventh and eighth lenses can improve the concentricity of the multiple lenses and reduce air gaps, thereby enhancing the long-term stability and reliability of the lens under harsh industrial environments (such as vibration and thermal cycling), and also making the lens structure relatively compact. d. All lenses use spherical mirrors, which significantly reduces mold costs and manufacturing complexity, and precisely limits the curvature radius and center thickness of key lenses to optimize aberration contribution. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the lens arrangement of the lens provided in the first embodiment of the present invention; Figure 2 The MTF frequency curve of the lens of the first embodiment of the present invention at an object distance of 350mm; Figure 3 The MTF frequency curve of the lens of the first embodiment of the present invention at an object distance of 500mm; Figure 4 The MTF frequency curve of the lens of the first embodiment of the present invention at an object distance of 150mm; Figure 5 The relative illumination curve of the lens according to the first embodiment of the present invention at an object distance of 350mm; Figure 6 The relative illumination curve of the lens according to the first embodiment of the present invention at an object distance of 500mm; Figure 7 The relative illumination curve of the lens of the first embodiment of the present invention at an object distance of 150mm; Figure 8 The distortion curve of the lens in the first embodiment of the present invention at an object distance of 350mm; Figure 9 The distortion curve of the lens in the first embodiment of the present invention at an object distance of 500mm; Figure 10 The distortion curve of the lens in the first embodiment of the present invention at an object distance of 150mm; Figure 11 This is a schematic diagram of the lens arrangement of a lens provided in the second embodiment of the present invention; Figure 12 The MTF frequency curve of the lens according to the second embodiment of the present invention at an object distance of 350mm; Figure 13 The MTF frequency curve of the lens according to the second embodiment of the present invention at an object distance of 500mm; Figure 14 The MTF frequency curve of the lens according to the second embodiment of the present invention at an object distance of 150mm; Figure 15The relative illumination curve of the lens according to the second embodiment of the present invention at an object distance of 350mm; Figure 16 The relative illumination curve of the lens according to the second embodiment of the present invention at an object distance of 500mm; Figure 17 The relative illumination curve of the lens according to the second embodiment of the present invention at an object distance of 150mm; Figure 18 The distortion curve of the lens according to the second embodiment of the present invention at an object distance of 350mm; Figure 19 The distortion curve of the lens according to the second embodiment of the present invention at an object distance of 500mm; Figure 20 The distortion curve of the lens in the second embodiment of the present invention at an object distance of 150mm; Figure 21 This is a schematic diagram of the lens arrangement of a lens provided in the third embodiment of the present invention; Figure 22 The MTF frequency curve of the lens according to the third embodiment of the present invention at an object distance of 350mm; Figure 23 The MTF frequency curve of the lens according to the third embodiment of the present invention at an object distance of 500mm; Figure 24 The MTF frequency curve of the lens according to the third embodiment of the present invention at an object distance of 150mm; Figure 25 The relative illumination curve of the lens according to the third embodiment of the present invention at an object distance of 350mm; Figure 26 The relative illumination curve of the lens according to the third embodiment of the present invention at an object distance of 500mm; Figure 27 The relative illumination curve of the lens according to the third embodiment of the present invention at an object distance of 150mm; Figure 28 The distortion curve of the lens in the third embodiment of the present invention at an object distance of 350mm; Figure 29 The distortion curve of the lens according to the third embodiment of the present invention at an object distance of 500mm; Figure 30 The distortion curve of the lens in the third embodiment of the present invention is shown at an object distance of 150mm. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0029] To address the shortcomings of existing technologies, this invention aims to provide an optical lens suitable for industrial inspection, capable of balancing a wide field of view and high image quality. This is achieved through a "positive-negative-positive-negative-positive-negative-positive-negative-negative-positive" arrangement of optical power lenses, resulting in a focal length that is consistent across the entire lens assembly. f Satisfies: 16.2mm≤ f ≤17.4mm, wherein the optical axis distance from the object-side surface of the third lens to the image-side surface of the fifth lens is between 10mm and 15mm, and the optical axis distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens is between 0.08mm and 1.7mm. The distance on the optical axis from the vertex of the object-side surface of the first lens to the imaging surface. TTL Approximately 55.5mm, TTL / f It features an optical lens with a maximum field of view of 61°, approximately 3.5, meeting the imaging quality requirements of high resolution, low distortion, low chromatic aberration, and high illumination uniformity.

[0030] See Figure 1 , Figure 11 and Figure 21The lens arrangement of the three embodiments in this application is shown, wherein the symbol L1 represents the first lens, L2 represents the second lens, L3 represents the third lens, L4 represents the fourth lens, L5 represents the fifth lens, L6 represents the sixth lens, L7 represents the seventh lens, L8 represents the aperture stop, L9 represents the eighth lens, L10 represents the ninth lens, L11 represents the tenth lens, L12 represents the filter, and L13 represents the imaging surface; the lenses L1 to L11 are arranged sequentially from the object side to the image side, the aperture stop L8 is disposed on the image side of the seventh lens L7 and the object side of the eighth lens L9, and the IR filter L12 is disposed between the tenth lens L11 and the imaging surface L13.

[0031] exist Figure 1 , Figure 11 and Figure 21 In the diagram, S1 represents the object-side surface of the first lens L1, and S2 represents the image-side surface of the first lens L1; S3 represents the object-side surface of the second lens L2, and S4 represents the image-side surface of the second lens L2; ​​S5 represents the object-side surface of the third lens L3, and S6 represents the image-side surface of the third lens L3, and also the object-side surface of the fourth lens L4 cemented with the third lens L3; S7 represents the image-side surface of the fourth lens L4, and also the object-side surface of the fifth lens L5 cemented with the fourth lens L4; S8 represents the image-side surface of the fifth lens L5; S9 represents the object-side surface of the sixth lens L6, and S10 represents the image-side surface of the sixth lens L6, and also... The object-side surface of the seventh lens L7 cemented with the sixth lens L6; S11 represents the image-side surface of the seventh lens L7; S12 represents the surface of the aperture L8; S13 represents the object-side surface of the eighth lens L9; S14 represents the image-side surface of the eighth lens L9; S15 represents the object-side surface of the ninth lens L10; S16 represents the image-side surface of the ninth lens L10; S17 represents the object-side surface of the tenth lens L11; S18 represents the image-side surface of the tenth lens L11; S19 represents the object-side surface of the filter L12 (such as an IR filter); S20 represents the image-side surface of the filter L12; S21 represents the surface where the imaging surface L13 is located.

[0032] The optical parameters in the following embodiments of the present invention include: Fov Indicates the maximum field of view of the lens. Y m Indicates correspondence Fov The image is tall, Y 1 indicates the image height of the lens when the half-field angle is 1°. TTL The total length of the lens is the distance along the optical axis from the vertex of the object side of the first lens in this embodiment to the imaging surface L13, 2× D 1 represents the effective diameter of the first lens. f 1 represents the focal length of the first lens. f 2 represents the focal length of the second lens. f 3 indicates the focal length of the third lens.f 4 represents the focal length of the fourth lens. f 5 indicates the focal length of the fifth lens. f 6 represents the focal length of the sixth lens. f 7 indicates the focal length of the seventh lens. f 8 represents the focal length of the eighth lens. f 9 indicates the focal length of the ninth lens. f 10 Indicates the focal length of the tenth lens. f Indicates the entire focal length of the lens. bfl It represents the back focal length of the lens (i.e., the closest distance from the image side of the tenth lens L11 to the imaging surface of the optical lens). pi Represents pi (π). r i1 Let represent the radius of curvature of the object-side surface of the i-th lens. r i2 Let be the radius of curvature of the image-side surface of the i-th lens. d Sm-Sn The distance between the optical axes of surfaces with surface number Sm and surface number Sn (i, m, n are integers) is represented by Infinity, which indicates that the radius of curvature is infinite, i.e., a plane.

[0033] The optical lens in this embodiment is designed to achieve a maximum field of view of 61°, a focal length of 16mm or more, and qualified OTF modulus and relative illumination, while having low distortion and low image distortion.

[0034] The first lens L1 to the tenth lens L11 are all spherical lenses.

[0035] First embodiment: Tables 1, 2, 3, and 4 show a first numerical embodiment of the optical lens according to the present invention, in conjunction with... Figures 1 to 10 To understand the first embodiment, Figure 1 The lens arrangement of the lens is shown in the following figure: From the object side to the image side, the following lenses are sequentially arranged: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L9, ninth lens L10, and tenth lens L11. The concave / convex surface characteristics and optical power characteristics of each lens are as follows: The first lens L1 has positive optical power, its object side has a convex structure near the optical axis, and its image side has a concave structure near the optical axis. The object side of the second lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis. The second lens also has negative optical power. The object side of the third lens has a concave structure near the optical axis, and its image side has a convex structure near the optical axis. The third lens has positive optical power. The fourth lens is a biconcave mirror with negative optical power; The fifth lens is a biconvex lens with positive optical power; The object side of the sixth lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis. The sixth lens also has negative optical power. The seventh lens is a biconvex lens with positive optical power; The object side of the eighth lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis, and it has negative optical power. The object side of the ninth lens has a concave structure near the optical axis, and its image side has a convex structure near the optical axis. The ninth lens also has negative optical power. The tenth lens is a biconvex lens with positive optical power. The above-mentioned positive-negative-positive-negative-positive-negative-positive-negative-positive optical power sequence, combined with a specific surface shape, achieves an optical lens that balances a large image area and image quality.

[0036] In addition to using cemented lenses to achieve achromatic effect, this embodiment also enables a relatively compact lens structure, reduces the number of light reflections between lenses to reduce light energy loss, and improves the stability of the optical lens. The Abbe constants of the first to the second lenses are low and high, respectively, while the Abbe constants of the eighth to the tenth lenses are low, high, and low, respectively. Among them, the difference in Abbe constant between the second lens L2 and the first lens L1 is greater than 40, the difference in Abbe constant between the third lens L3 and the fourth lens L4 is greater than 30, the difference in Abbe constant between the seventh lens L7 and the sixth lens L6 is greater than 50, and the difference in Abbe constant between the ninth lens L10 and the tenth lens L11 is greater than 15. The large difference in Abbe constant between adjacent lenses is beneficial for correcting chromatic aberration, improving image quality, reducing assembly sensitivity, and increasing image plane size. Therefore, the first lens L1 and the second lens L2 form an achromatic lens group, the third lens L3 and the fourth lens L4 form an achromatic lens group, the sixth lens L6 and the seventh lens L7 form an achromatic lens group, and the ninth lens L10 and the tenth lens L11 form an achromatic lens group.

[0037] In this embodiment, the optical lens satisfies: 50°≤ Fov ≤61°, 17.9mm≤ Y m ≤18.3mm, 19.50mm≤2× D 1≤23.5mm, 0.55mm≤ Y 1≤0.66mm, 57mm≤ TTL ≤61mm, 9.0mm≤ bfl≤11.0mm,16.3mm≤ f ≤17.2mm,8.4mm≤ f 7≤9.4mm,1.39≤ Fov / Y m / 2≤1.65,3.14≤ TTL / f ≤3.57,1.15≤2× D 1 / f ≤1.49,31.2≤ Y 1×180 / pi ≤38.0,3.03≤ f 1 / f ≤3.57,-1.54≤ f 2 / f ≤-1.08,0.99≤ f 3 / f ≤1.45,-0.68≤ f 4 / f ≤-0.26,0.50≤ f 5 / f ≤0.94,-1.58≤ f 6 / f ≤-1.12,0.33≤ f 7 / f ≤0.75,-1.75≤ f 8 / f ≤-1.28,-2.89≤ f 9 / f ≤-2.38,0.80≤ f 10 / f ≤1.26,0.12≤ bfl / TTL ≤0.21,0.59≤ bfl / f ≤0.62,0.22≤ Y m / TTL ≤0.43,0.04≤ Fov / (2× D 1) / TTL ≤0.05,2.45≤ r 31 / r 32 ≤2.60,1.81≤ r 61 / r 62 ≤1.94,1.43≤ r 92 / r 91 ≤1.54,7.9≤| r101 / r 102 |≤8.9.

[0038] The optical axis distance from the object-side surface of the third lens to the image-side surface of the fifth lens d S5-S8 The optical axis distance between the image-side surface of the fifth lens and the object-side surface of the sixth lens is between 12.1 mm and 14.8 mm. d S8-S9 The center thickness of the fifth lens is between 0.13 mm and 0.17 mm. d S7-S8 Between 4.25mm and 4.75mm, the radius of curvature of the third lens satisfies: -21.5mm ≤ r 31 ≤-19.2mm, -10.3mm≤ r 32 The radius of curvature of the fifth lens is ≤-7.9mm, and satisfies: -26.4mm≤ r 52 The center thickness of the seventh lens is ≤-22.5mm. d S10-S11 The optical axis distance between the image-side surface of the seventh lens and the object-side surface of the eighth lens is between 4.25 mm and 4.75 mm. d S11-S13 The distance from the image-side surface of the seventh lens to the imaging surface is between 1.05 mm and 1.94 mm. d S11-S21 The center thickness of the eighth lens is between 19.8 mm and 21.3 mm. d S13-S14 The distance from the object-side surface of the eighth lens to the imaging surface is between 0.9 mm and 1.0 mm. d S13-S21 The optical axis distance between the object-side surface of the ninth lens and the image-side surface of the tenth lens is between 18.9 mm and 19.3 mm. d S15-S18 The distance from the object-side surface of the tenth lens to the imaging surface is between 4.0 mm and 4.4 mm. d S18-S21 Between 8.7mm and 9.3mm.

[0039] As described above, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a cemented lens, 2.49≤ f 3 / ( -f 4)≤2.69, 0.58≤ -f 4 / f5≤0.70, 30≤vd3-vd4≤38, 2.5≤vd5-vd4≤4, where vd3 is the Abbe constant of the third lens, vd4 is the Abbe constant of the fourth lens, and vd5 is the Abbe constant of the fifth lens. In the positive-negative-positive three-element cemented lens configured in this application, the difference in Abbe constant between the positive and negative lenses near the object side is larger to achieve efficient FC achromatic aberration, while the difference in Abbe constant between the negative and positive lenses near the image side is smaller, allowing the fifth lens to be mainly used for field flattening and second-order spectral fine-tuning. This configuration can simultaneously achieve low chromatic aberration, low field curvature, low higher-order aberrations, and good mass production at moderate optical power.

[0040] The sixth lens L6 and the seventh lens L7 form a cemented lens, 2.3≤ -f 6 / f 7≤2.7, 45≤vd7-vd6≤57, where vd6 is the Abbe constant of the sixth lens and vd7 is the Abbe constant of the seventh lens.

[0041] In a specific numerical embodiment, the optical parameters of each lens, aperture, and IR filter are shown in Tables 1 to 4: Table 1 Lens optical parameters of the first embodiment

[0042] In the table, a radius of curvature of infinity indicates that the corresponding surface number represents a plane.

[0043] Among them, the distance D1 between the aperture surface of surface number S9 and the object side of the fifth lens and the distance D2 between the image side of the eighth lens of surface number S16 and the filter object side are variable distances. The variable distance D1 has a variable range of 0.85mm to 1.8mm, and the variable distance D2 has a variable range of 0.95mm to 1.05mm.

[0044] Taking object distances of 350mm, 500mm, and 150mm as examples, the corresponding interval distances D1 and D2 are shown in Table 2: Table 2. Variable interval distances corresponding to the three object distances in the first embodiment.

[0045] At an object distance of 350mm, the lens magnification is 0.0460; at an object distance of 500mm, the lens magnification is 0.0324; and at an object distance of 150mm, the lens magnification is 0.1053.

[0046] Other optical parameters of the lens in this embodiment are shown in Table 3: Table 3 Other optical parameters of the lens at three object distances in the first embodiment

[0047] The optical parameter expressions of the lens in this embodiment are shown in Table 4: Table 4. Optical parameter expressions for the lens at three object distances in the first embodiment.

[0048] The table data in this embodiment uses rounding to obtain the calculated values.

[0049] This embodiment optimizes the maximum field of view of the lens through collaborative optimization. Fov Like Gao Y 1. Full field of view image height Y m Back focal length bfl Parameters constrain edge aberrations and image plane matching; simultaneously, the focal lengths of the first to tenth lenses are specifically assigned. f 1- f 10 By finely adjusting the curvature radius of each lens surface and the air gap between lenses, astigmatism, field curvature, and distortion are evenly distributed across the entire field of view, thereby significantly improving the uniformity of imaging across the entire field of view.

[0050] The optical power arrangement ends in a negative-positive sequence, with longer sequences... bfl This allows for sufficient working distance to the last positive lens, enabling it to more smoothly correct field curvature and distortion, avoiding edge quality degradation caused by forcibly compressing the overall length. Longer... bfl It also helps light reach the sensor edge at a smaller angle of incidence, which is beneficial for large sensors (such as 1.1 inches and above) to prevent edge vignetting (Cos4 attenuation) and color shift (CRA matching). Maintaining TTL / f Under the premise of a relatively compact overall length not exceeding 3.9, combined with a longer... bfl, It provides ample installation space for the filter components, and at the same time, it utilizes this space to optimize the incident angle of the rear light group, effectively improving the relative illumination and astigmatism of the edge field of view.

[0051] In this embodiment, the lens with the highest optical power is the seventh lens (8.4mm≤). f(7≤9.4mm), placing it in the middle to rear position and cementing it with the eighth lens can effectively collect and straighten large-angle light rays, significantly reduce the aperture and incident angle of subsequent lenses, thereby effectively controlling coma, astigmatism and field curvature, improving the uniformity of image quality at the edges and center, ensuring image quality, and facilitating the provision of sufficient rear working distance for the sensor while compressing the overall length, making it convenient to install filters, mechanical shutters and other components, improving the mechanical compatibility and practicality of the lens; it also facilitates centralized correction of advanced aberrations and constrains the matching degree between edge aberrations and the image plane.

[0052] This embodiment, by cementing the third to fifth lenses, suppresses chromatic aberration at its source, preventing it from propagating to the subsequent groups and reducing the burden on subsequent aberration correction. Furthermore, the three cemented lenses provide greater freedom in glass pairing, achieving better chromatic aberration correction with a relatively smaller number of lenses. The cementing of the seventh and eighth lenses further improves the concentricity of the multiple lenses and reduces air gaps, enhancing the long-term stability and reliability of the lens under harsh industrial environments (such as vibration and thermal cycling), and further contributing to miniaturization. The optical lens in this embodiment can be widely used in line scan cameras or area scan cameras for industrial vision inspection.

[0053] Taking a lens resolution of 100LP / mm as an example, Figures 2 to 4 The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the first embodiment described above at object distances of 350mm, 500mm, and 150mm. The horizontal axis represents spatial frequency in line pairs per millimeter (LP / mm); the vertical axis represents OTF modulus (normalized MTF) in dimensionless format. Figure 2 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) reaches over 65%, while the OTF modulus of the peripheral field of view represented by TS 9.0500 (mm) reaches over 50%. From Figure 3 It can be seen that, in millimeters, the OTF modulus of the central field of view, represented by TS 0.0000 (mm), reaches over 65%, while the OTF modulus of the peripheral field of view, represented by TS 9.0500 (mm), reaches over 50%. In millimeters, from... Figure 4As can be seen, in millimeters, TS 0.0000 (mm) represents approximately 60% of the OTF modulus in the center field of view, while TS 9.0500 (mm) represents approximately 45% of the OTF modulus in the edge field of view. This demonstrates that the lens exhibits excellent and balanced OTF modulus performance in the center field of view at different object distances, exhibiting good image quality stability across various distances. Furthermore, the OTF modulus performance in the edge field of view is also good at different object distances. This indicates that the lens has good defocus tolerance within a certain object distance range, maintaining usable high resolution without requiring precise refocusing. The absolute difference between the edge and center field of view is controlled within 20%, and the relative attenuation is controlled within 25%, resulting in good image quality uniformity from center to edge, meeting the application requirements for consistent performance across the entire field of view.

[0054] Figures 5 to 7 The images show the relative illumination curves of the lens in the first embodiment described above at object distances of 350mm, 500mm, and 150mm. The relative illumination diagram reflects the uniformity of illumination in the image, with the horizontal axis representing the Y-field of view (in mm) and the vertical axis representing relative illumination. Figure 5 It can be seen that in this specific embodiment, the optical lens with a Y-field of view of approximately 9.05mm corresponds to a relative illumination greater than 60%; from Figure 6 It can be seen that the relative illuminance corresponding to a Y-field of view of approximately 9.05 mm is greater than 60%; from Figure 7 It can be seen that the relative illuminance corresponding to a Y field of view of about 9.05mm is greater than 60%, which reflects the uniformity of the image illuminance and the adaptability of the object distance under different working distances. The light intake is sufficient, ensuring that even when the lens is used in a relatively dark environment, there will be no dark corners at the edges of the actual image, which can meet the requirements of machine vision and industrial inspection for edge brightness consistency.

[0055] Figures 8 to 10 The images show the distortion of the lens in the first embodiment above at object distances of 350mm, 500mm, and 150mm. Distortion is a principal ray aberration, reflecting the similarity of the image. The horizontal axis represents the distortion percentage (in %), and the vertical axis represents the normalized image height (unitless). Figure 8 The absolute value of the maximum distortion is less than 0.5%. Figure 9 The absolute value of the maximum distortion is less than 0.6%. Figure 10 The maximum distortion is less than 0.3%, indicating that the distortion of the optical lens in this embodiment is well controlled. At different working distances, there is no obvious distortion of the lens image, the image distortion is low and the imaging quality is high, which can meet the strict requirements of geometric fidelity for high-precision machine vision measurement and image calibration.

[0056] Second embodiment: Tables 5, 6, 7, and 8 show a second numerical embodiment of the optical lens according to the present invention, in conjunction with... Figures 11 to 20 To understand the second embodiment, Figure 11 The lens arrangement of the lens is shown in the following figure: From the object side to the image side, the following lenses are sequentially arranged: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L9, ninth lens L10, and tenth lens L11. The concave / convex surface characteristics and optical power characteristics of each lens are as follows: The first lens L1 has positive optical power, its object side has a concave structure near the optical axis, and its image side has a convex structure near the optical axis. The object side of the second lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis. The second lens also has negative optical power. The object side of the third lens has a concave structure near the optical axis, and its image side has a convex structure near the optical axis. The third lens has positive optical power. The fourth lens is a biconcave mirror with negative optical power; The fifth lens is a biconvex lens with positive optical power; The object side of the sixth lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis. The sixth lens also has negative optical power. The seventh lens is a biconvex lens with positive optical power; The object side of the eighth lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis, and it has negative optical power. The object side of the ninth lens has a concave structure near the optical axis, and its image side has a convex structure near the optical axis. The ninth lens also has negative optical power. The tenth lens has a concave structure on its object side near the optical axis and a convex structure on its image side near the optical axis, and the tenth lens has positive optical power.

[0057] The above-mentioned positive-negative-positive-negative-positive-negative-positive-negative-negative-positive optical power sequence, combined with a specific surface shape, achieves an optical lens that balances a large image area and image quality.

[0058] In addition to using cemented lenses to achieve achromatic correction, this embodiment also enables a relatively compact lens structure, reduces the number of light reflections between lenses to minimize light energy loss, and improves the stability of the optical lens. The Abbe constants of the first to second lenses exhibit low and high values, respectively. Specifically, the difference in Abbe constant between the second lens L2 and the first lens L1 is greater than 40, the difference between the third lens L3 and the fourth lens L4 is approximately 27, and the difference between the seventh lens L7 and the sixth lens L6 is approximately 45. The large difference in Abbe constant between adjacent lenses is beneficial for correcting chromatic aberration, improving image quality, reducing assembly sensitivity, and increasing image plane size. Therefore, the first lens L1 and the second lens L2 form an achromatic lens group, the third lens L3 and the fourth lens L4 form an achromatic lens group, and the sixth lens L6 and the seventh lens L7 form an achromatic lens group.

[0059] In this embodiment, the optical lens satisfies: 50°≤ Fov ≤60°, 17.9mm≤ Y m ≤18.3mm, 19.96mm≤2× D 1≤23.52mm, 0.55mm≤ Y 1≤0.67mm, 57mm≤ TTL ≤61mm, 12.4mm≤ bfl ≤16.8mm, 16.3mm≤ f ≤17.2mm, 7.5mm≤ f 7≤8.5mm, 1.40≤ Fov / Y m / 2≤1.65, 3.4≤ TTL / f ≤3.65, 1.15≤2× D 1 / f ≤1.43, 31.9≤ Y 1×180 / pi ≤38.0, 9.8≤ f 1 / f ≤10.4, -1.71≤ f 2 / f ≤-1.44, 1.28≤ f 3 / f ≤1.54, -0.73≤ f 4 / f ≤-0.51, 0.81≤ f 5 / f ≤1.05, -1.68≤ f 6 / f ≤-1.41, 0.36≤ f 7 / f ≤0.59, -1.39≤f 8 / f ≤-1.14, -3.13≤ f 9 / f ≤-2.79, 0.80≤ f 10 / f ≤1.04, 0.20≤ bfl / TTL ≤0.31, 0.78≤ bfl / f ≤1.02, 0.25≤ Y m / TTL ≤0.37, 0.03≤ Fov / (2× D 1) / TTL ≤0.05, 2.15≤ r 31 / r 32 ≤2.40, 2.38≤ r 61 / r 62 ≤2.57, 1.25≤ r 92 / r 91 ≤1.43, 8.5≤| r 101 / r 102 |≤8.9.

[0060] The optical axis distance from the object-side surface of the third lens to the image-side surface of the fifth lens d S5-S8 The optical axis distance between the image-side surface of the fifth lens and the object-side surface of the sixth lens is between 10.5 mm and 12.7 mm. d S8-S9 The center thickness of the fifth lens is between 0.08 mm and 0.12 mm. d S7-S8 Between 3.7mm and 4.8mm, the radius of curvature of the third lens satisfies: -21.5mm ≤ r 31 ≤-19.2mm, -10.3mm≤ r 32 The radius of curvature of the fifth lens is ≤-7.9mm, and satisfies: -26.4mm≤ r 52 The center thickness of the seventh lens is ≤-22.5mm. d S10-S11 The optical axis distance between the image-side surface of the seventh lens and the object-side surface of the eighth lens is between 2.6 mm and 3.6 mm. d S11-S13The distance from the image-side surface of the seventh lens to the imaging surface is between 1.12 mm and 2.18 mm. d S11-S21 The center thickness of the eighth lens is between 17.6 mm and 20.3 mm. d S13-S14 The distance from the object-side surface of the eighth lens to the imaging surface is between 0.7 mm and 0.9 mm. d S13-S21 The optical axis distance from the object-side surface of the ninth lens to the image-side surface of the tenth lens is between 16.8 mm and 17.8 mm. d S15-S18 The distance from the object-side surface of the tenth lens to the imaging surface is between 3.8 mm and 4.0 mm. d S18-S21 Between 8.7mm and 9.3mm.

[0061] As described above, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a cemented lens, 1.7≤ f 3 / ( -f 4)≤2.8, 0.62≤ -f 4 / f 5≤0.72, 25≤vd3-vd4≤29, 6.5≤vd4-vd5≤9.5, where vd3 is the Abbe constant of the third lens, vd4 is the Abbe constant of the fourth lens, and vd5 is the Abbe constant of the fifth lens. In the positive-negative-positive three-element cemented lens configured in this application, the difference in Abbe constant between the positive and negative lenses near the object side is larger to achieve efficient FC achromatic aberration, while the difference in Abbe constant between the negative and positive lenses near the image side is smaller, allowing the fifth lens to be mainly used for field flattening and second-order spectral fine-tuning. This configuration can simultaneously obtain low chromatic aberration, low field curvature, low higher-order aberrations, and good mass production capabilities at moderate optical power.

[0062] The sixth lens L6 and the seventh lens L7 form a cemented lens, 3.05≤ -f 6 / f 7≤3.45, 45≤vd7-vd6≤53, where vd6 is the Abbe constant of the sixth lens and vd7 is the Abbe constant of the seventh lens.

[0063] In a specific numerical embodiment, the optical parameters of each lens, aperture, and IR filter are shown in Tables 5 to 8: Table 5 Lens optical parameters of the second embodiment

[0064] In the table, a radius of curvature of infinity indicates that the corresponding surface number represents a plane.

[0065] Among them, the distance D1 between the aperture surface of surface number S9 and the object side of the fifth lens and the distance D2 between the image side of the eighth lens of surface number S16 and the filter object side are variable distances. The variable distance D1 has a variable range of 0.7mm to 1.9mm, and the variable distance D2 has a variable range of 5.2mm to 6.6mm.

[0066] Taking object distances of 350mm, 500mm, and 150mm as examples, the corresponding interval distances D1 and D2 are shown in Table 6: Table 6. Variable Interval Distances Corresponding to the Three Object Distances in the Second Embodiment

[0067] At an object distance of 350mm, the lens magnification is 0.0468; at an object distance of 500mm, the lens magnification is 0.0328; and at an object distance of 150mm, the lens magnification is 0.1076.

[0068] Other optical parameters of the lens in this embodiment are shown in Table 7: Table 7 Other optical parameters of the lens at three object distances in the second embodiment

[0069] The optical parameter expressions of the lens in this embodiment are shown in Table 8: Table 8. Optical parameter expressions for the lens at three object distances in the second embodiment.

[0070] The table data in this embodiment uses rounding to obtain the calculated values.

[0071] This embodiment optimizes the maximum field of view of the lens through collaborative optimization. Fov Like Gao Y 1. Full field of view image height Y m Back focal length bfl Parameters constrain edge aberrations and image plane matching; simultaneously, the focal lengths of the first to tenth lenses are specifically assigned. f 1- f 10 By finely adjusting the curvature radius of each lens surface and the air gap between lenses, astigmatism, field curvature, and distortion are evenly distributed across the entire field of view, thereby significantly improving the uniformity of imaging across the entire field of view.

[0072] The optical power arrangement ends in a negative-positive sequence, with longer sequences... bflThis allows for sufficient working distance to the last positive lens, enabling it to more smoothly correct field curvature and distortion, avoiding edge quality degradation caused by forcibly compressing the overall length. Longer... bfl It also helps light reach the sensor edge at a smaller angle of incidence, which is beneficial for large sensors (such as 1.1 inches and above) to prevent edge vignetting (Cos4 attenuation) and color shift (CRA matching). Maintaining TTL / f Under the premise of a compact overall length not exceeding 3.6, combined with a longer... bfl, It provides ample installation space for the filter components, and at the same time, it utilizes this space to optimize the incident angle of the rear light group, effectively improving the relative illumination and astigmatism of the edge field of view.

[0073] In this embodiment, the lens with the highest optical power is the seventh lens (7.5mm≤). f (7≤8.5mm), placing it in the middle to rear position and cementing it with the eighth lens can effectively collect and straighten large-angle light rays, significantly reduce the aperture and incident angle of subsequent lenses, thereby effectively controlling coma, astigmatism and field curvature, improving the uniformity of image quality at the edges and center, ensuring image quality, and facilitating the provision of sufficient rear working distance for the sensor while compressing the overall length, making it convenient to install filters, mechanical shutters and other components, improving the mechanical compatibility and practicality of the lens; it also facilitates centralized correction of advanced aberrations and constrains the matching degree between edge aberrations and the image plane.

[0074] This embodiment, by cementing the third to fifth lenses, suppresses chromatic aberration at its source, preventing it from propagating to the subsequent groups and reducing the burden on subsequent aberration correction. Furthermore, the three cemented lenses provide greater freedom in glass pairing, achieving better chromatic aberration correction with a relatively smaller number of lenses. The cementing of the seventh and eighth lenses further improves the concentricity of the multiple lenses and reduces air gaps, enhancing the long-term stability and reliability of the lens under harsh industrial environments (such as vibration and thermal cycling), and further contributing to miniaturization. The optical lens in this embodiment can be widely used in line scan cameras or area scan cameras for industrial vision inspection.

[0075] Taking a lens resolution of 100LP / mm as an example, Figures 12 to 14 The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the first embodiment described above at object distances of 350mm, 500mm, and 150mm. The horizontal axis represents spatial frequency in line pairs per millimeter (LP / mm); the vertical axis represents OTF modulus (normalized MTF) in dimensionless format. Figure 12It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) reaches over 65%, while the OTF modulus of the peripheral field of view represented by TS 9.0500 (mm) exceeds 50%. From Figure 13 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS0.0000 (mm) reaches over 65%, while the OTF modulus of the peripheral field of view represented by TS9.0500 (mm) reaches over 50%. In millimeters, from... Figure 14 As can be seen, in millimeters, TS 0.0000 (mm) represents an OTF modulus of over 65% in the center field of view, and TS 9.0500 (mm) represents an OTF modulus of over 50% in the edge field of view, indicating that the lens can produce clear images. It is evident that the lens exhibits excellent and balanced OTF modulus performance in both the center and edge fields of view at different object distances, demonstrating good image quality stability across varying object distances. Furthermore, the lens demonstrates good defocus tolerance within a certain object distance range, maintaining usable high resolution without requiring precise refocusing. The absolute difference between the edge and center fields of view is controlled at approximately 20%, with a relative attenuation within 25%, resulting in good image quality uniformity from center to edge, meeting the application requirements for consistent performance across the entire field of view.

[0076] Figures 15 to 17 The images show the relative illumination curves of the lens in the second embodiment described above at object distances of 350mm, 500mm, and 150mm. The relative illumination diagram reflects the uniformity of illumination in the image, with the horizontal axis representing the Y-field of view (in mm) and the vertical axis representing relative illumination. Figure 15 It can be seen that in this specific embodiment, the optical lens with a Y-field of view of approximately 9.05mm corresponds to a relative illuminance greater than 60%, reflecting that the image image captured by this lens has uniform illumination and sufficient light intake. From Figure 16 It can be seen that the relative illumination corresponding to a Y-field of view of approximately 9.05mm is about 60%, reflecting that the image image captured by this lens has uniform illumination and sufficient light intake. From Figure 17 It can be seen that the relative illuminance corresponding to a Y field of view of about 9.05mm is about 70%, which reflects the uniformity of the image illuminance and the adaptability of the object distance under different working distances. The light intake is sufficient, ensuring that even when the lens is used in a relatively dark environment, there will be no dark corners at the edges of the actual image, which can meet the requirements of machine vision and industrial inspection for edge brightness consistency.

[0077] Figures 18 to 20 The images show the distortion of the lens in the second embodiment above at object distances of 350mm, 500mm, and 150mm. Distortion is a principal ray aberration, reflecting the similarity of the image. The horizontal axis represents the distortion percentage (in %), and the vertical axis represents the normalized image height (unitless). Figure 18The absolute value of the maximum distortion is less than 1%. Figure 19 The absolute value of the maximum distortion is less than 1.2%. Figure 20 The maximum distortion is less than 0.8%, indicating that the distortion of the optical lens in this embodiment is well controlled, with no obvious distortion in the image and low image quality. It is evident that the optical lens in this embodiment exhibits low geometric distortion, high object similarity, and stable distortion characteristics at different working distances. The image shows no obvious distortion, low image quality, and high image quality, meeting the basic requirements for low-distortion imaging in machine vision inspection and image geometric calibration.

[0078] Third embodiment: Tables 9, 10, 11, and 12 show a third numerical embodiment of the optical lens according to the present invention, in conjunction with... Figures 21 to 30 To understand the third embodiment, Figure 21 The lens arrangement of the lens is shown in the following figure: From the object side to the image side, the following lenses are sequentially arranged: first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L9, ninth lens L10, and tenth lens L11. The concave / convex surface characteristics and optical power characteristics of each lens are as follows: The first lens has positive optical power, its object side has a planar structure near the optical axis, and its image side has a convex structure near the optical axis. The object side of the second lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis. The second lens also has negative optical power. The object side of the third lens has a concave structure near the optical axis, and its image side has a convex structure near the optical axis. The third lens has positive optical power. The fourth lens is a biconcave mirror with negative optical power; The fifth lens is a biconvex lens with positive optical power; The object side of the sixth lens has a convex structure near the optical axis, and its image side has a concave structure near the optical axis. The sixth lens also has negative optical power. The seventh lens is a biconvex lens with positive optical power; The object side of the eighth lens has a planar structure near the optical axis, and its image side has a concave structure near the optical axis, and it has negative optical power. The object side of the ninth lens has a concave structure near the optical axis, and its image side has a convex structure near the optical axis. The ninth lens also has negative optical power. The tenth lens has a concave structure on its object side near the optical axis and a convex structure on its image side near the optical axis, and the tenth lens has positive optical power.

[0079] The above positive-negative-positive-negative-positive-negative-positive-negative-negative-positive optical power sequence, combined with a specific surface shape, achieves an optical lens that balances a large image area and image quality.

[0080] In addition to using cemented lenses to achieve achromatic aberration, this embodiment also enables a relatively compact lens structure, reduces the number of light reflections between lenses to minimize light energy loss, and improves the stability of the optical lens. The Abbe constants of the first to second lenses exhibit low and high values, respectively. Specifically, the difference in Abbe constant between the second lens L2 and the first lens L1 is greater than 40, the difference between the third lens L3 and the fourth lens L4 is approximately 30, and the difference between the seventh lens L7 and the sixth lens L6 is approximately 45. The large difference in Abbe constant between adjacent lenses is beneficial for correcting chromatic aberration, improving image quality, reducing assembly sensitivity, and increasing image plane size. Therefore, the first lens L1 and the second lens L2 form an achromatic lens group, the third lens L3 and the fourth lens L4 form an achromatic lens group, and the sixth lens L6 and the seventh lens L7 form an achromatic lens group.

[0081] In this embodiment, the optical lens satisfies: 50°≤ Fov ≤60°, 17.9mm≤ Y m ≤18.3mm, 20.07mm≤2× D 1≤23.41mm, 0.55mm≤ Y 1≤0.67mm, 58mm≤ TTL ≤62mm, 12.4mm≤ bfl ≤17.9mm, 16.35mm≤ f ≤17.3mm, 7.6mm≤ f 7≤8.6mm, 1.39≤ Fov / Y m / 2≤1.65, 3.47≤ TTL / f ≤3.66, 1.16≤2× D 1 / f ≤1.42, 31.9≤ Y 1×180 / pi ≤38.2, 8.9≤ f 1 / f ≤9.5, -1.77≤ f 2 / f ≤-1.50, 1.49≤ f 3 / f ≤1.76, -0.83≤ f 4 / f ≤-0.60, 0.88≤ f 5 / f≤1.13, -1.62≤ f 6 / f ≤-1.35, 0.37≤ f 7 / f ≤0.59, -1.41≤ f 8 / f ≤-1.15, -3.36≤ f 9 / f ≤-3.02, 0.81≤ f 10 / f ≤1.05, 0.12≤ bfl / TTL ≤0.21, 0.78≤ bfl / f ≤1.03, 0.22≤ Y m / TTL ≤0.43, 0.03≤ Fov / (2× D 1) / TTL ≤0.05, 1.8≤ r 31 / r 32 ≤2.2, 2.5≤ r 61 / r 62 ≤3.0, 1.1≤ r 92 / r 91 ≤1.5, 8.5≤| r 101 / r 102 |≤8.9.

[0082] The optical axis distance from the object-side surface of the third lens to the image-side surface of the fifth lens d S5-S8 The optical axis distance between the image-side surface of the fifth lens and the object-side surface of the sixth lens is between 10.2 mm and 12.4 mm. d S8-S9 The center thickness of the fifth lens is between 0.08 mm and 0.12 mm. d S7-S8 Between 3.4mm and 4.1mm, the radius of curvature of the third lens satisfies: -21.5mm ≤ r 31 ≤-19.2mm, -10.3mm≤ r 32 The radius of curvature of the fifth lens is ≤-7.9mm, and satisfies: -26.4mm≤ r 52 The center thickness of the seventh lens is ≤-22.5mm.d S10-S11 The optical axis distance between the image-side surface of the seventh lens and the object-side surface of the eighth lens is between 2.5 mm and 3.1 mm. d S11-S13 The distance from the image-side surface of the seventh lens to the imaging surface is between 1.3 mm and 2.1 mm. d S11-S21 The center thickness of the eighth lens is between 18.2 mm and 19.1 mm. d S13-S14 The distance from the object-side surface of the eighth lens to the imaging surface is between 0.7 mm and 0.9 mm. d S13-S21 The optical axis distance from the object-side surface of the ninth lens to the image-side surface of the tenth lens is between 16.5 mm and 17.5 mm. d S15-S18 The distance from the object-side surface of the tenth lens to the imaging surface is between 3.4 mm and 3.9 mm. d S18-S21 Between 8.7mm and 9.3mm.

[0083] As described above, the third lens L3, the fourth lens L4, and the fifth lens L5 constitute a cemented lens, 1.7≤ f 3 / ( -f 4)≤2.8, 0.66≤ -f 4 / f 5≤0.78, 25≤vd3-vd4≤30, 3.5≤vd4-vd5≤7.0, where vd3 is the Abbe constant of the third lens, vd4 is the Abbe constant of the fourth lens, and vd5 is the Abbe constant of the fifth lens. In the positive-negative-positive three-element cemented lens configured in this application, the difference in Abbe constant between the positive and negative lenses near the object side is larger to achieve efficient FC achromatic correction, while the difference in Abbe constant between the negative and positive lenses near the image side is smaller, allowing the fifth lens to be mainly used for field flattening and second-order spectral fine-tuning. This configuration can simultaneously achieve low chromatic aberration, low field curvature, low higher-order aberrations, and good mass production capabilities at moderate optical power.

[0084] The sixth lens L6 and the seventh lens L7 form a cemented lens, 2.95≤ -f 6 / f 7≤3.27, 45≤vd7-vd6≤53, where vd6 is the Abbe constant of the sixth lens and vd7 is the Abbe constant of the seventh lens.

[0085] In a specific numerical embodiment, the optical parameters of each lens, aperture, and IR filter are shown in Tables 9 to 12: Table 9 Lens optical parameters of the third embodiment

[0086] In the table, a radius of curvature of infinity indicates that the corresponding surface number represents a plane.

[0087] Among them, the distance D1 between the aperture surface of surface number S9 and the object side of the fifth lens and the distance D2 between the image side of the eighth lens of surface number S16 and the filter object side are variable distances. The variable distance D1 has a variable range of 0.7mm to 1.8mm, and the variable distance D2 has a variable range of 5.1mm to 6.4mm.

[0088] Taking object distances of 350mm, 500mm, and 150mm as examples, the corresponding interval distances D1 and D2 are shown in Table 10: Table 10 Variable Interval Distance Table Corresponding to Three Object Distances in the Third Embodiment

[0089] At an object distance of 350mm, the lens magnification is 0.0469; at an object distance of 500mm, the lens magnification is 0.0329; and at an object distance of 150mm, the lens magnification is 0.1080.

[0090] Other optical parameters of the lens in this embodiment are shown in Table 11: Table 11 Other optical parameters of the lens at three object distances in the third embodiment

[0091] The optical parameter expressions of the lens in this embodiment are shown in Table 12: Table 12 Optical parameter expressions for the lens at three object distances in the third embodiment

[0092] The table data in this embodiment uses rounding to obtain the calculated values.

[0093] This embodiment optimizes the maximum field of view of the lens through collaborative optimization. Fov Like Gao Y 1. Full field of view image height Y m Back focal length bfl Parameters constrain edge aberrations and image plane matching; simultaneously, the focal lengths of the first to tenth lenses are specifically assigned. f 1- f 10By finely adjusting the curvature radius of each lens surface and the air gap between lenses, astigmatism, field curvature, and distortion are evenly distributed across the entire field of view, thereby significantly improving the uniformity of imaging across the entire field of view.

[0094] The optical power arrangement ends in a negative-positive sequence, with longer sequences... bfl This allows for sufficient working distance to the last positive lens, enabling it to more smoothly correct field curvature and distortion, avoiding edge quality degradation caused by forcibly compressing the overall length. Longer... bfl It also helps light reach the sensor edge at a smaller angle of incidence, which is beneficial for large sensors (such as 1.1 inches and above) to prevent edge vignetting (Cos4 attenuation) and color shift (CRA matching). Maintaining TTL / f Under the premise of a relatively compact overall length not exceeding 3.6, combined with a longer... bfl, It provides ample installation space for the filter components, and at the same time, it utilizes this space to optimize the incident angle of the rear light group, effectively improving the relative illumination and astigmatism of the edge field of view.

[0095] In this embodiment, the lens with the highest optical power is the seventh lens (7.6mm≤). f (7≤8.6mm), placing it in the middle to rear position and cementing it with the eighth lens can effectively collect and straighten large-angle light rays, significantly reduce the aperture and incident angle of subsequent lenses, thereby effectively controlling coma, astigmatism and field curvature, improving the uniformity of image quality at the edges and center, ensuring image quality, and facilitating the provision of sufficient rear working distance for the sensor while compressing the overall length, making it convenient to install filters, mechanical shutters and other components, improving the mechanical compatibility and practicality of the lens; it also facilitates centralized correction of advanced aberrations and constrains the matching degree between edge aberrations and the image plane.

[0096] This embodiment, by cementing the third to fifth lenses, can suppress chromatic aberration at its source and prevent it from being transmitted to the rear group, thus reducing the burden on subsequent aberration correction. Furthermore, the three cemented lenses provide more freedom in glass pairing, achieving better chromatic aberration correction with a relatively small number of lenses. In addition, the cementing of the seventh and eighth lenses can improve the concentricity of the multiple lenses and reduce air gaps, thereby enhancing the long-term stability and reliability of the lens under harsh industrial environments (such as vibration and thermal cycling), and further contributing to miniaturization.

[0097] The optical lens in this embodiment can be widely used in line scan cameras or area scan cameras for industrial vision inspection.

[0098] Taking a lens resolution of 100LP / mm as an example, Figures 22 to 24The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the third embodiment described above at object distances of 350mm, 500mm, and 150mm. The horizontal axis represents spatial frequency in line pairs per millimeter (LP / mm); the vertical axis represents OTF modulus (normalized MTF) in dimensionless format. Figure 22 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) reaches over 65%, while the OTF modulus of the peripheral field of view represented by TS 9.0500 (mm) reaches over 55%. From Figure 23 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS0.0000 (mm) reaches over 65%, while the OTF modulus of the peripheral field of view represented by TS9.0500 (mm) reaches over 55%. In millimeters, from... Figure 24 As can be seen, in millimeters, TS 0.0000 (mm) represents a center field-of-view OTF modulus of approximately 65%, while TS 9.0500 (mm) represents an edge field-of-view OTF modulus exceeding 50%, indicating that the lens can produce clear images. At different object distances, the lens exhibits excellent and balanced performance in both the center and edge field-of-view OTF modulus, with the absolute difference between the two fields controlled within 20% and the relative attenuation within 25%. This demonstrates that the lens maintains good image quality stability across different object distances, exhibiting excellent defocus tolerance within a certain object distance range, allowing for usable high resolution without requiring precise refocusing. The absolute difference between the edge and center field-of-view is controlled at around 20%, and the relative attenuation is within 25%, indicating good image quality uniformity from center to edge, meeting the application requirements for consistent performance across the entire field of view.

[0099] Figures 25 to 27 The images show the relative illumination curves of the lens in the third embodiment above at object distances of 350mm, 500mm, and 150mm. The relative illumination diagram reflects the uniformity of illumination in the image. The horizontal axis represents the Y-field of view (in mm), and the vertical axis represents the relative illumination. Figure 25 It can be seen that the optical lens in this specific embodiment has a relative illuminance greater than 65% corresponding to a Y-field of view of approximately 9.05mm, reflecting that the image image captured by this lens has uniform illumination and sufficient light intake. From Figure 26 It can be seen that the relative illuminance corresponding to a Y-field of view of approximately 9.05mm is about 65%, reflecting that the image image captured by this lens has uniform illumination and sufficient light intake. From Figure 27It can be seen that the relative illuminance corresponding to a Y field of view of about 9.05mm is about 70%, which reflects the uniformity of the image illuminance and the adaptability of the object distance under different working distances. The light intake is sufficient, ensuring that even when the lens is used in a relatively dark environment, there will be no dark corners at the edges of the actual image, which can meet the requirements of machine vision and industrial inspection for edge brightness consistency.

[0100] Figures 28 to 30 The images show the distortion of the lens in the third embodiment above at object distances of 350mm, 500mm, and 150mm. Distortion is a principal ray aberration, reflecting the similarity of the image. The horizontal axis represents the distortion percentage (in %), and the vertical axis represents the normalized image height (unitless). Figure 28 The absolute value of the maximum distortion is less than 1.2%. Figure 29 The absolute value of the maximum distortion is less than 1.2%. Figure 30 The maximum distortion is less than 0.8%, indicating that the optical lens in this embodiment has low geometric distortion, high object similarity, and stable distortion characteristics at different working distances. The lens image has no obvious distortion, low image distortion, and high imaging quality, which can meet the basic requirements of machine vision inspection and image geometric calibration for low distortion imaging.

[0101] In one embodiment of the present invention, a camera device is provided, including an electronic photosensitive element and an optical lens as described in any or a combination of the above embodiments.

[0102] In one embodiment of the present invention, an industrial inspection device is provided, including an image processor and a camera as described above, wherein the camera device can be a line scan camera or an area scan camera.

[0103] The optical lens in this embodiment can be widely used in different fields and scenarios. For example, the lens can be integrated with an electronic photosensitive element to form a camera device (line scan camera or area scan camera), which can be applied to industrial inspection equipment (such as automatic optical inspection equipment).

[0104] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0105] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An optical lens comprising ten lenses of optical power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object plane to the image plane, characterized in that: The first lens has positive optical power; The object-side surfaces of the second and sixth lenses are convex near the optical axis, and the image-side surfaces are concave near the optical axis. Both the second and sixth lenses have negative optical power. The object-side surfaces of the third and ninth lenses are concave near the optical axis, and their image-side surfaces are convex near the optical axis. The third lens has positive optical power, and the ninth lens has negative optical power. The object-side surface and its image-side surface of the fourth lens are both concave near the optical axis. The object-side surface and the image-side surface of the fifth and seventh lenses are both convex near the optical axis. The image-side surface of the tenth lens is convex near the optical axis, and the tenth lens has positive optical power. The image-side surface of the eighth lens is concave near the optical axis and has negative optical power. The third lens, the fourth lens, and the fifth lens constitute a cemented lens, and the sixth lens and the seventh lens constitute a cemented lens; The optical lens satisfies: 16.2mm ≤ f ≤17.4mm, 50°≤ Fov ≤61°, and the optical axis distance from the object side of the third lens to the image side of the fifth lens is between 10mm and 15mm, and the optical axis distance from the image side of the fifth lens to the object side of the sixth lens is between 0.08mm and 1.7mm, wherein, f This refers to the entire focal length of the lens. Fov This is the maximum field of view of the lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 54mm≤ TTL ≤62mm, 3.1≤ TTL / f ≤3.9, where, TTL It is the distance on the optical axis from the vertex of the object side of the first lens to the imaging surface.

3. The optical lens according to claim 1, characterized in that, Among the ten lenses with optical power, the seventh lens is the positive lens with the highest optical power, and its focal length is between 7.2mm and 9.7mm.

4. The optical lens according to claim 1, characterized in that, The difference between the Abbe constant of the third lens and the Abbe constant of the fourth lens is between 25 and 40, and the absolute value of the difference between the Abbe constants of the fourth lens and the fifth lens is no greater than 10.

5. The optical lens according to claim 4, characterized in that, The center thickness of the fifth lens is between 3.3 mm and 4.9 mm; and / or, The radius of curvature of the third lens satisfies: -21.5mm ≤ r 31 ≤-19.2mm, -10.3mm≤ r 32 ≤-7.9mm, where, r 31 Let be the radius of curvature of the object-side surface of the third lens. r 32 The radius of curvature of the image-side surface of the third lens; and / or, The radius of curvature of the fifth lens satisfies: -26.4mm≤ r 52 ≤-22.5mm, where, r 52 Let be the radius of curvature of the image-side surface of the third lens.

6. The optical lens according to claim 1, characterized in that, The optical axis distance from the image-side surface of the seventh lens to the object-side surface of the eighth lens is between 0.95 mm and 2.3 mm; the optical axis distance from the image-side surface of the seventh lens to the imaging surface is between 17 mm and 22 mm; and the center thickness of the eighth lens is between 0.6 mm and 1.1 mm; and / or, The optical axis distance from the object-side surface of the ninth lens to the image-side surface of the tenth lens is between 3.2 mm and 4.6 mm, and the optical axis distance from the object-side surface of the tenth lens to the imaging surface is between 8.5 mm and 9.5 mm; and / or, The center thickness of the nine lenses is 0.75 mm to 1.0 mm; and / or, The difference between the Abbe constant of the sixth lens and the Abbe constant of the seventh lens is not less than 35.

7. The optical lens according to claim 1, characterized in that, The focal length of each lens satisfies the following condition: 3.03 ≤ f 1 / f ≤10.4, -1.77≤ f 2 / f ≤-1.08, 0.99≤ f 3 / f ≤1.76, -0.83≤ f 4 / f ≤-0.26, 0.50≤ f 5 / f ≤1.13, -1.68≤ f 6 / f ≤-1.12, 0.33≤ f 7 / f ≤0.75, -1.75≤ f 8 / f ≤-1.14, -3.36≤ f 9 / f ≤-2.38, 0.80≤ f 10 / f ≤1.26, where, f 1 is the focal length of the first lens ，f 2 represents the focal length of the second lens. f 3 is the focal length of the third lens ，f 4 represents the focal length of the fourth lens. f 5 is the focal length of the fifth lens. f 6 is the focal length of the sixth lens. f 7 represents the focal length of the seventh lens. f 8 represents the focal length of the eighth lens. f 9 is the focal length of the ninth lens. f 10 This is the focal length of the tenth lens.

8. The optical lens according to claim 1, characterized in that, The radius of curvature of the third lens satisfies: 0.6 ≤ r 31 / r 32 ≤2.8, where, r 31 Let be the radius of curvature of the object-side surface of the third lens. r 32 Let be the radius of curvature of the image-side surface of the third lens; The radius of curvature of the sixth lens satisfies: 1.7 ≤ r 61 / r 62 ≤3, where, r 61 Let be the radius of curvature of the object-side surface of the sixth lens. r 62 Let be the radius of curvature of the image-side surface of the sixth lens; The radius of curvature of the ninth lens satisfies: 1.0 ≤ r 92 / r 91 ≤1.6, where, r 91 Let be the radius of curvature of the object-side surface of the ninth lens. r 92 Let be the radius of curvature of the image-side surface of the ninth lens; The radius of curvature of the tenth lens satisfies: 7.8 ≤ | r 101 / r 102 |≤9.0, where, r 101 Let be the radius of curvature of the object-side surface of the tenth lens. r 102 Let be the radius of curvature of the image-side surface of the tenth lens.

9. The optical lens according to claim 1, characterized in that, The lens satisfies: 1.28≤ Fov / Y m / 2≤1.76, where, Fov The maximum field of view of the lens. Y m The image height corresponding to the maximum field of view; And / or, 31.4≤ Y 1×180 / pi ≤38.7, where, Y 1 represents the lens image height when the half-field of view is 1°. pi Pi; And / or, 0.03≤ Fov / (2× D 1) / TTL ≤0.05, where 2× D 1 is the effective diameter of the first lens. Fov This is the maximum field of view of the lens.

10. The optical lens according to claim 1, characterized in that, The lens satisfies: 9.0mm≤ bfl ≤17.9mm, of which, bfl This is the shortest distance from the image-side surface of the tenth lens to the imaging surface; And / or, 0.12≤ bfl / TTL ≤0.31, where, bfl This is the shortest distance from the image-side surface of the tenth lens to the imaging surface. TTL The distance on the optical axis is from the vertex of the object side of the first lens to the imaging surface; And / or, 0.22≤ Y m / TTL ≤0.43, where, Y m The image height corresponding to the maximum field of view. TTL The distance on the optical axis is from the vertex of the object side of the first lens to the imaging surface; And / or, 1.0 ≤ 2 × D 1 / f ≤1.6, where 2× D 1 represents the effective diameter of the first lens; And / or, 0.58≤ bfl / f ≤0.95, where, bfl It is the shortest distance from the image side of the tenth lens to the imaging surface.

11. The optical lens according to claim 1, characterized in that, The lens satisfies: 17.8mm≤ Y m ≤18.4mm, where, Y m The image height corresponding to the maximum field of view; And / or, 0.54mm≤ Y 1≤0.68mm, where, Y 1 represents the lens image height when the half-field angle is 1°; And / or, 19.5mm≤2× D 1≤23.6mm, where 2× D 1 represents the effective diameter of the first lens.

12. The optical lens according to claim 1, characterized in that, The optical lens also includes an aperture stop disposed between the seventh lens and the eighth lens, and the optical axis distance between the aperture stop and the object side surface of the eighth lens is adjustable in the range of 0.6 mm to 1.9 mm; And / or, the optical lens further includes a filter disposed between the tenth lens and the imaging surface, the optical axis distance between the filter and the imaging surface being adjustable in the range of 0.85 mm to 7.1 mm.

13. The optical lens according to any one of claims 1 to 12, characterized in that, All ten lenses with optical power are spherical mirrors.

14. A camera device, characterized in that, It includes electronic photosensitive elements and optical lenses as described in any one of claims 1 to 13.

15. An industrial testing device, characterized in that, It includes an image processor and a camera device as described in claim 14.

Images