Short-focus large-view optical lens, camera device and industrial detection equipment with same

Abstract

The application discloses a short-focus large-view-field optical lens, a camera device and industrial detection equipment with the same. Eight lenses with positive, negative, negative, positive, positive, positive, negative, positive and positive optical powers are arranged in sequence along an optical axis from an object plane to an image plane. The first lens and the second lens are both convex to the object plane. The image side surface of the third lens is concave. The fourth lens is convex to the image plane. The object side surface of the fifth lens is convex. The sixth lens is a double convex lens. The seventh lens is a double concave lens. The image side surface of the eighth lens is convex. The ninth lens is a double convex lens or a plano-convex lens. The total focal length of the lens is between 5.5 mm and 8.8 mm, the maximum field angle is between 55 DEG and 80 DEG, the total length of the lens is between 46 mm and 55 mm, and the effective diameter of the first lens is between 21 mm and 28 mm. The lens distribution is beneficial to control the field curvature and distortion, and the spatial frequency of not less than 100 LP / mm can be supported in the range of 100 mm to infinity.

Description

Technical Field

[0001] This invention relates to the field of optics, and more particularly to a short-focal-length, wide-field-of-view optical lens, a camera device, and an industrial testing equipment having the same. Background Technology

[0002] With the rapid development of machine vision technology in industrial automation inspection, the market's requirements for the performance of optical lenses are becoming increasingly stringent. On the one hand, industrial inspection needs to acquire high-resolution images at close range to identify minute defects or precision components; on the other hand, it needs to achieve wide-angle coverage within a limited space while ensuring good environmental adaptability and high reliability.

[0003] However, existing short-focal-length lenses with wide field of view generally suffer from design contradictions. To achieve a wide field of view of 60° to 75°, traditional designs often have to sacrifice system image quality. Some products use too many lens groups, resulting in an excessively large overall length. TTL (Typically exceeding 60mm), these lenses are difficult to adapt to confined installation spaces; other solutions, due to excessive volume compression, lead to difficulties in aberration correction and a significant decrease in edge field-of-view resolution, failing to meet the resolution requirements of high-pixel sensors. Furthermore, existing lenses lack targeted optimization in aperture stop selection and the arrangement of front and rear lens groups, resulting in poor distortion control and stray light suppression at large field-of-view angles, affecting image sharpness.

[0004] The disclosure of the above background information 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

[0005] The purpose of this invention is to provide a lens design that combines short focal length, wide field of view, and high image quality, which can meet the urgent needs of the industrial sector for high-performance optical systems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An optical lens comprising nine 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, and a ninth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein: The optical powers of the first to the ninth lenses are positive, negative, negative, positive, positive, positive, negative, positive, positive, and positive, respectively. The first and second lenses are both meniscus lenses convex to the object surface; the image-side surface of the third lens is concave near the optical axis; the fourth lens is a meniscus lens convex to the image surface; the object-side surface of the fifth lens is convex near the optical axis; the sixth lens is a biconvex lens; the seventh lens is a biconcave lens; the image-side surface of the eighth lens is convex near the optical axis; and the ninth lens is a biconvex lens or a plano-convex lens. The optical lens satisfies: 5.5mm ≤ f ≤8.8mm, 55°≤ Fov ≤80°, 46mm≤ TTL ≤55mm, 21mm≤2× D 1≤28mm, where, f This refers to the entire focal length of the lens. Fov The maximum field of view of the lens. TTL The distance from the vertex of the object side of the first lens to the imaging surface on the optical axis is 2× D 1 represents the effective diameter of the first lens.

[0007] Furthermore, based on any one or a combination of the aforementioned technical solutions, the optical lens can support a spatial frequency of not less than 100 LP / mm in the object distance range from 100 mm to infinity, and at a spatial frequency of 100 LP / mm, the MTF curves corresponding to each object distance satisfy that the OTF modulus of the center field of view and the 0.5 field of view are not less than 0.5.

[0008] Furthermore, based on any one or a combination of the aforementioned technical solutions, the optical lens satisfies: 9mm ≤ Y m ≤10mm, 0.18mm≤ Y 1≤0.33mm, 30≤ Y m / Y 1≤48, where, Y m The image height corresponding to the maximum field of view. Y 1 represents the lens image height when the half field of view is 1°.

[0009] Furthermore, following any one or a combination of the aforementioned technical solutions, the focal length of each lens satisfies the following condition: 4.2 ≤ f 1 / f ≤7.5, -2.9≤ f 2 / f ≤-1.7, -1.6≤ f 3 / f ≤-1.05, 5.8≤ f 4 / f ≤10.2, 1.8≤f 5 / f ≤2.7, 0.75≤ f 6 / f ≤1.2, -0.8≤ f 7 / f ≤-0.4, 1.2≤ f 8 / f ≤2.75, 1.5≤ f 9 / f ≤3.1, 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 is the focal length of the seventh lens. f 8 represents the focal length of the eighth lens. f 9 represents the focal length of the ninth lens.

[0010] Furthermore, following any one or a combination of the aforementioned technical solutions, 14.5mm ≤ r 11 ≤24mm, 41mm≤ r 12 ≤130mm, where, r 11 Let be the radius of curvature of the object-side surface of the first lens. r 12 Let be the radius of curvature of the image-side surface of the first lens.

[0011] Furthermore, based on any one or a combination of the aforementioned technical solutions, the optical axis distance from the object side of the first lens to the object side of the fourth lens is between 11.8 mm and 14.9 mm, the center thickness of the first lens is between 4 mm and 6.6 mm, the center thickness of the second lens is between 0.85 mm and 2.65 mm, and the center thickness of the third lens is between 0.6 mm and 1.2 mm. The optical axis distance from the object side of the sixth lens to the image side of the ninth lens is between 6 mm and 11.3 mm. The center thickness of the sixth lens is between 1.5 mm and 3.6 mm. The center thickness of the seventh lens is between 0.65 mm and 1.25 mm. The center thickness of the eighth lens is between 1 mm and 2.75 mm. The center thickness of the ninth lens is between 0.9 mm and 5.1 mm.

[0012] Furthermore, based on any one or a combination of the aforementioned technical solutions, among the nine lenses with optical power, the lens with the highest optical power among the positive lenses is the sixth lens, whose focal length is between 5mm and 9.4mm, and whose radius of curvature of the image side is between -7mm and -3.8mm. The seventh lens is the negative lens with the highest optical power. Its focal length is between -5.6mm and -2.8mm, its object side radius of curvature is between -7mm and -3.8mm, and its image side radius of curvature is between 6.5mm and 25mm.

[0013] Furthermore, based on any one or a combination of the aforementioned technical solutions, the focal length of each lens satisfies the following condition: 35mm ≤ f 1≤46mm, -23mm≤ f 2≤-11mm, -11.3mm≤ f 3≤-6.8mm, 36mm≤ f 4≤78mm, 12.5mm≤ f 5≤20.3mm, 4.9mm≤ f 6≤9.6mm, -5.9mm≤ f 7 ≤ -2.8 mm, 8 mm ≤ f 8≤22mm, 12mm≤ f 9≤24mm, 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 is the focal length of the seventh lens. f 8 represents the focal length of the eighth lens. f 9 represents the focal length of the ninth lens.

[0014] Furthermore, following any one or a combination of the aforementioned technical solutions, the optical axis air gap between the first lens and the second lens is between 0 and 0.35 mm, the optical axis air gap between the sixth lens and the seventh lens is between 0 and 0.35 mm, the optical axis air gap between the seventh lens and the eighth lens is between 0 and 0.2 mm, and the optical axis air gap between the eighth lens and the ninth lens is between 0 and 2 mm.

[0015] Furthermore, based on any one or a combination of the aforementioned technical solutions, among the nine lenses with optical power, the lens with the largest central thickness is the fourth lens, and the lens with the smallest optical power is also the fourth lens. The center thickness of the fourth lens is between 4.6 mm and 11.2 mm, the radius of curvature of its object side is between -33 mm and -16 mm, and the radius of curvature of its image side is between -23 mm and -12 mm.

[0016] Furthermore, based on any one or a combination of the aforementioned technical solutions, the optical lens satisfies: 7.2mm ≤ bfl ≤11.7mm, 0.92≤ bfl / f ≤1.74, 0.13≤ bfl / TTL ≤0.23, 5.6≤ TTL / f ≤9, where, bfl This is the rear focal length of the lens.

[0017] Furthermore, based on any one or a combination of the aforementioned technical solutions, the optical lens satisfies: 0.04 ≤ Fov / (2× D 1) / TTL ≤0.065, 2.5≤2× D 1 / f ≤4.6, 6≤ Fov / Y m ≤8.7, and 0.165≤ Y m / TTL ≤0.21, 11.5≤ Y 1×180 / pi ≤17.5, 5.6≤ TTL / f ≤9, where, Y m The image height corresponding to the maximum field of view. Y 1 represents the lens image height when the half field of view is 1°.

[0018] Furthermore, following any or a combination of the aforementioned technical solutions, the sixth lens and the seventh lens constitute a cemented lens, and the optical lens satisfies: 1.4 ≤ -f 6 / f 7≤1.88, 18≤vd6-vd7≤55, 20≤vd8-vd7≤60, where, f 6 is the focal length of the sixth lens. f 7 is the focal length of the seventh lens, vd6 is the Abbe constant of the sixth lens, vd7 is the Abbe constant of the seventh lens, and vd8 is the Abbe constant of the eighth lens. And / or, the seventh lens and the eighth lens constitute a cemented lens, and the optical lens satisfies: 2.4 ≤ -f 8 / f 7≤3, 20≤vd8-vd7≤60, 20≤vd8-vd9≤62, where,f 7 is the focal length of the seventh lens. f 8 is the focal length of the eighth lens, vd7 is the Abbe constant of the seventh lens, vd8 is the Abbe constant of the eighth lens, and vd9 is the Abbe constant of the ninth lens.

[0019] Furthermore, based on any one or a combination of the aforementioned technical solutions, all eight lenses with optical power are spherical mirrors.

[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 fifth lens and the sixth lens, wherein the air gap between the aperture stop and the sixth lens is adjustable within the range of 0 mm to 2.5 mm; And / or, the optical lens further includes a filter disposed between the ninth lens and the imaging surface, wherein the air gap between the optical axis of the ninth lens and the filter is adjustable in the range of 3 mm to 9.5 mm.

[0021] 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.

[0022] According to another aspect of the present invention, an industrial inspection device is provided, including an image processor and a camera device as described above, wherein the camera device may be a line scan camera or an area scan camera.

[0023] The beneficial effects of the technical solution provided by this invention are as follows: a. The focal length of the lens of the present invention is 5.5mm to 9mm, the total length of the lens is controlled between 46mm and 55mm, and the field of view is 55° to 80°, thus realizing a short focal length and large field of view design; b. The lens of this invention adopts a 9-lens structure with an optical power distribution of positive, negative, negative, positive, positive, positive, negative, positive, positive, forming an effective aberration complementary mechanism. This enables the lens to support a spatial frequency of 166 LP / mm at the image plane and maintain a high modulation transfer function (MTF) across the entire field of view. This meets the high resolution requirements of industrial inspection sensors with 5 megapixels and above, enabling clear capture of subtle features. Attached Figure Description

[0024] 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.

[0025] Figure 1This 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 in the first embodiment of the present invention at an infinity object distance; Figure 3 The MTF frequency curve of the lens of the first embodiment of the present invention at an object distance of 300mm; Figure 4 The MTF frequency curve of the lens of the first embodiment of the present invention at an object distance of 100mm; Figure 5 The relative illumination curve of the lens in the first embodiment of the present invention at an infinity object distance; Figure 6 The relative illumination curve of the lens according to the first embodiment of the present invention at an object distance of 300mm; Figure 7 The relative illumination curve of the lens according to the first embodiment of the present invention at an object distance of 100mm; Figure 8 The distortion curve of the lens in the first embodiment of the present invention at an object distance of infinity; Figure 9 The distortion curve of the lens according to the first embodiment of the present invention at an object distance of 300mm; Figure 10 The distortion curve of the lens in the first embodiment of the present invention at an object distance of 100mm; 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 in the second embodiment of the present invention at an object distance of infinity; Figure 13 The MTF frequency curve of the lens according to the second embodiment of the present invention at an object distance of 300mm; Figure 14 The MTF frequency curve of the lens according to the second embodiment of the present invention at an object distance of 100mm; Figure 15 The relative illumination curve of the lens in the second embodiment of the present invention at an infinity object distance; Figure 16 The relative illumination curve of the lens according to the second embodiment of the present invention at an object distance of 300mm; Figure 17 The relative illumination curve of the lens according to the second embodiment of the present invention at an object distance of 100mm; Figure 18 The distortion curve of the lens in the second embodiment of the present invention at an infinity object distance; Figure 19 The distortion curve of the lens according to the second embodiment of the present invention at an object distance of 300mm; Figure 20 The distortion curve of the lens in the second embodiment of the present invention at an object distance of 100mm; 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 in the third embodiment of the present invention at an infinity object distance; Figure 23 The MTF frequency curve of the lens according to the third embodiment of the present invention at an object distance of 300mm; Figure 24 The MTF frequency curve of the lens according to the third embodiment of the present invention at an object distance of 100mm; Figure 25 The relative illumination curve of the lens in the third embodiment of the present invention at an infinity object distance; Figure 26 The relative illumination curve of the lens according to the third embodiment of the present invention at an object distance of 300mm; Figure 27 The relative illumination curve of the lens according to the third embodiment of the present invention at an object distance of 100mm; Figure 28 The distortion curve of the lens in the third embodiment of the present invention at an infinity object distance; Figure 29 The distortion curve of the lens in the third embodiment of the present invention at an object distance of 300mm; Figure 30 The distortion curve of the lens in the third embodiment of the present invention at an object distance of 100mm; Figure 31 This is a schematic diagram of the lens arrangement of the lens provided in the fourth embodiment of the present invention; Figure 32 The MTF frequency curve of the lens in the fourth embodiment of the present invention at an infinity object distance; Figure 33 The MTF frequency curve of the lens according to the fourth embodiment of the present invention at an object distance of 300mm; Figure 34 The MTF frequency curve of the lens according to the fourth embodiment of the present invention at an object distance of 100mm; Figure 35 This is the relative illumination curve of the lens in the fourth embodiment of the present invention at an infinity object distance; Figure 36 The relative illumination curve of the lens according to the fourth embodiment of the present invention at an object distance of 300mm; Figure 37 This is the relative illumination curve of the lens according to the fourth embodiment of the present invention at an object distance of 100mm; Figure 38 The distortion curve of the lens in the fourth embodiment of the present invention at an infinity object distance; Figure 39 The distortion curve of the lens according to the fourth embodiment of the present invention at an object distance of 300mm; Figure 40 The distortion curve of the lens in the fourth embodiment of the present invention at an object distance of 100mm; Figure 41 This is a schematic diagram of the lens arrangement of the lens provided in the fifth embodiment of the present invention; Figure 42 The MTF frequency curve of the lens according to the fifth embodiment of the present invention at an infinity object distance; Figure 43 The MTF frequency curve of the lens according to the fifth embodiment of the present invention at an object distance of 300mm; Figure 44 The MTF frequency curve of the lens according to the fifth embodiment of the present invention at an object distance of 100mm; Figure 45 The relative illumination curve of the lens in the fifth embodiment of the present invention at an infinity object distance; Figure 46 The relative illumination curve of the lens according to the fifth embodiment of the present invention at an object distance of 300mm; Figure 47 The relative illumination curve of the lens according to the fifth embodiment of the present invention at an object distance of 100mm; Figure 48 The distortion curve of the lens in the fifth embodiment of the present invention at an infinity object distance; Figure 49 The distortion curve of the lens according to the fifth embodiment of the present invention at an object distance of 300mm; Figure 50 The distortion curve of the lens according to the fifth embodiment of the present invention at an object distance of 100mm; Figure 51 This is a schematic diagram of the lens arrangement of a lens provided in the sixth embodiment of the present invention; Figure 52 The MTF frequency curve of the lens in the sixth embodiment of the present invention at an infinity object distance; Figure 53 The MTF frequency curve of the lens according to the sixth embodiment of the present invention at an object distance of 300mm; Figure 54The MTF frequency curve of the lens according to the sixth embodiment of the present invention at an object distance of 100mm; Figure 55 The relative illumination curve of the lens according to the sixth embodiment of the present invention at an infinity object distance; Figure 56 The relative illumination curve of the lens according to the sixth embodiment of the present invention at an object distance of 300mm; Figure 57 The relative illumination curve of the lens according to the sixth embodiment of the present invention at an object distance of 100mm; Figure 58 The distortion curve of the lens in the sixth embodiment of the present invention at an infinity object distance; Figure 59 The distortion curve of the lens according to the sixth embodiment of the present invention at an object distance of 300mm; Figure 60 The distortion curve of the lens in the sixth embodiment of the present invention is shown at an object distance of 100mm. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] by Figure 1For example, the lens arrangement of the first embodiment is shown, where 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 aperture stop, L7 represents the sixth lens, L8 represents the seventh lens, L9 represents the eighth lens, L10 represents the ninth lens, L11 represents the filter, and L12 represents the imaging surface; the first lens L1 to the ninth lens L10 are arranged sequentially from the object side to the image side, the aperture stop L6 is located on the image side of the fifth lens L5 and the object side of the sixth lens L7, and the IR filter L11 is located between the ninth lens L10 and the imaging surface L12.

[0029] In the first, second, and third embodiments of the present invention Figure 1 , Figure 11 , Figure 21 In the diagram, S1 represents the object-side surface of the first lens L1, S2 represents the image-side surface of the first lens L1; S3 represents the object-side surface of the second lens L2, S4 represents the image-side surface of the second lens L2; ​​S5 represents the object-side surface of the third lens L3, S6 represents the image-side surface of the third lens L3; S7 represents the object-side surface of the fourth lens L4, S8 represents the image-side surface of the fourth lens L4; S9 represents the object-side surface of the fifth lens L5, S10 represents the image-side surface of the fifth lens L5; S11 represents the surface of the aperture stop L6; and S12 represents the object-side surface of the sixth lens L7. 3 represents the image-side surface of the sixth lens L7, and also the object-side surface of the seventh lens L8 cemented to the sixth lens L7; S14 represents the image-side surface of the seventh lens L8, and also the object-side surface of the eighth lens L9 cemented to the seventh lens L8; S15 represents the image-side surface of the eighth lens L9; S16 represents the object-side surface of the ninth lens L10; S17 represents the image-side surface of the ninth lens L10; S18 represents the object-side surface of the filter L11 (such as an IR filter); S19 represents the image-side surface of the filter L11; S20 represents the surface where the imaging surface L12 is located.

[0030] In the fourth, fifth, and sixth embodiments of the present invention, Figure 31 , Figure 41 , Figure 51 The symbols S1 to S13 are the same as in the previous embodiments. Unlike the previous three embodiments, where the sixth lens L7, the seventh lens L8, and the eighth lens L9 form a cemented lens, in the latter three embodiments, only the sixth lens L7 and the seventh lens L8 form a cemented lens. Therefore, S14 represents the image side of the seventh lens L8, S15 represents the object side of the eighth lens L9, and S16 represents the image side of the eighth lens L9; S17 represents the object side of the ninth lens L10, and S18 represents the image side of the ninth lens L10; S19 represents the object side of the filter L11 (such as an IR filter), and S20 represents the image side of the filter L11; S21 represents the surface where the imaging surface L12 is located.

[0031] 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, in this embodiment of the invention, is the distance along the optical axis from the vertex of the object-side surface of the first lens to the imaging surface L12, 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 Indicates the entire focal length of the lens. bfl The rear focal length of the lens (in this embodiment of the invention, it is the closest distance from the image side of the ninth lens L9 to the imaging surface S21 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 vd be the radius of curvature of the image-side surface of the i-th lens. i Let be the Abbe constant of the i-th lens. d Sm-Sn The distance between the optical axes of the surface with surface number Sm and the surface with surface number Sn (i, m, n are integers).

[0032] The lens in this embodiment is designed to be a short focal length lens with a wide field of view, with a focal length of 5.5 to 9 mm, and has qualified OTF modulus and relative illumination, while having low distortion and low image distortion.

[0033] From an economic and cost perspective, all lenses from the first lens L1 to the ninth lens L10 can be made of spherical lenses, significantly reducing mold costs and manufacturing complexity. The curvature radius and center thickness of key lenses are precisely defined to optimize aberration contributions. This invention does not limit each lens to using only spherical lenses.

[0034] 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 L7, seventh lens L8, eighth lens L9, and ninth lens L10. 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 second lens L2 has negative 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 third lens L3 is a biconcave mirror with negative optical power; The fourth lens L4 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 fifth lens L5 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 sixth lens L7 is a biconvex lens with positive optical power; the seventh lens L8 is a biconcave lens with negative optical power; the eighth lens L9 and the ninth lens L10 are both biconvex lenses with positive optical power. The sixth lens L7, the seventh lens L8, and the eighth lens L9 form a cemented triplet lens, which reduces the number of light reflections between the lenses to reduce the loss of light energy and lower the misjudgment rate in the algorithm recognition process. Furthermore, the Abbe constant differences between the sixth and seventh lenses, the seventh and eighth lenses, and the eighth and ninth lenses are all relatively large, which is beneficial for correcting chromatic aberration, improving image quality, reducing assembly sensitivity, and increasing image plane size. Therefore, the sixth lens L7 to the ninth lens L10 form an achromatic lens group. The above-mentioned positive-negative-negative-positive-positive-positive-negative-positive-positive optical power sequence, combined with a specific surface shape, is beneficial for better correction of off-axis aberrations and control of field curvature and distortion.

[0035] In this embodiment, the optical lens satisfies: 73°≤ Fov ≤76°, 9mm≤ Y m ≤10mm, 24mm≤2× D 1≤28mm, 0.18mm≤ Y 1≤0.25mm, 46.5mm≤ TTL ≤52.5mm, 5.5mm≤ f ≤7mm, 35mm≤ f1≤45mm,-16mm≤ f 2≤-12mm,-9.6mm≤ f 3≤-7.5mm,36mm≤ f 4≤46.5mm,12.5mm≤ f 5≤17mm,5.5mm≤ f 6≤7mm,-4.2mm≤ f 7≤-3mm,8mm≤ f 8≤12.2mm,14.5mm≤ f 9≤18.5mm,39≤ Y m / Y 1≤48,0.18≤ Y m / TTL ≤0.21,7° / mm≤ Fov / Y m ≤8.7° / mm,7≤ TTL / f ≤9,3.8≤2× D 1 / f ≤4.6,11.5≤ Y 1×180 / pi ≤13.2,6.2≤ f 1 / f ≤6.98,-2.6≤ f 2 / f ≤-2,-1.6≤ f 3 / f ≤-1.1,6.3≤ f 4 / f ≤7.2,2.2≤ f 5 / f ≤2.7,0.95≤ f 6 / f ≤1.08,-0.62≤ f 7 / f ≤-0.53,1.55≤ f 8 / f ≤1.75,2.65≤ f 9 / f ≤2.82,9.5mm≤ bfl ≤10.8mm,1.55≤ bfl / f ≤1.74,0.18≤ bfl / TTL ≤0.22,0.05° / mm 2 ≤ Fov / (2× D 1) / TTL ≤0.065° / mm 2 ,16mm≤ r11 ≤24mm, 50mm≤ r 12 ≤66mm, air gap between the optical axes of the first and second lenses d S2-S3 The air gap between the optical axes of the eighth and ninth lenses is between 0 and 0.35 mm. d S15-S16 Between 0 and 0.35 mm; The optical axis distance from the object-side surface S1 of the first lens L1 to the object-side surface S7 of the fourth lens L4 d S1-S7 The center thickness of the first lens is between 13.2 mm and 14.7 mm. d S1-S2 The center thickness of the second lens is between 5mm and 6.6mm. d S3-S4 The center thickness of the third lens is between 1.1 mm and 1.85 mm. d S4-S5 Between 0.8mm and 1.2mm; The optical axis distance from the object-side surface S12 of the sixth lens L7 to the image-side surface S17 of the ninth lens L10 d S12-S17 The center thickness of the sixth lens is between 6mm and 7.3mm. d S12-S13 The center thickness of the seventh lens is between 1.5mm and 1.95mm. d S13-S14 The center thickness of the eighth lens is between 0.85mm and 1.25mm. d S14-S15 The center thickness of the ninth lens is between 1.75mm and 2.25mm. d S16-S17 Between 1.3mm and 1.8mm.

[0036] As described above, the sixth lens L7, the seventh lens L8, and the eighth lens L9 constitute a cemented lens, 1.64≤ -f 6 / f 7≤1.85, 2.6≤ -f 8 / f 7≤3, 25≤vd6-vd7≤35, 30≤vd8-vd7≤60, 35≤vd8-vd9≤62.

[0037] In this embodiment, the lens with the highest optical power among the positive lenses is the sixth lens, with a focal length between 5.8mm and 6.6mm and a radius of curvature of its image-side surface between -7mm and -3.8mm. The lens with the highest optical power among the negative lenses is the seventh lens, with a focal length between -4.6mm and -2.8mm, a radius of curvature of its object-side surface between -7mm and -3.8mm, and a radius of curvature of its image-side surface between 6.5mm and 12mm. By cementing the high-power sixth and seventh lenses together in a mid-to-rear position, not only is the converging ability enhanced to compress the length, but it also facilitates centralized correction of advanced aberrations and constrains edge aberrations and image plane matching.

[0038] In this embodiment, among the nine lenses with optical power, the fourth lens has the largest center thickness and the smallest optical power; the center thickness of the fourth lens... d S7-S8 The radius of curvature of its side surface is between 5mm and 7mm. r 41 Between -25mm and -16mm, its image side radius of curvature r 42 Between -19mm and -12mm.

[0039] 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

[0040] In the table, if the radius of curvature is infinite, it means that the corresponding surface number represents a plane.

[0041] Among them, the distance D_1 between the image side of the aperture L6 with surface number S11 and the object side of the sixth lens L7, and the air distance D_2 between the optical axis of the ninth lens L10 with surface number S17 and the filter L11 are variable distances. The variable distance D_1 has a variable range of 1.5mm to 2.5mm, and the variable distance D_2 has a variable range of 8mm to 9.5mm.

[0042] Taking object distances of infinity, 300mm, and 100mm as examples, the corresponding interval distances D_1 and D_2 are shown in Table 2: Table 2. Variable interval distances corresponding to the three object distances in the first embodiment.

[0043] The lens magnification is 0 when the object distance is infinity; 0.0194 when the object distance is 300mm; and 0.0519 when the object distance is 100mm.

[0044] 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

[0045] 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.

[0046] The table data in this embodiment uses rounding to obtain the calculated values.

[0047] This embodiment optimizes the maximum field of view of the lens through collaborative optimization. Fov ,focal length f Parameters such as positive and negative optical power arrangement constrain the edge aberrations and image plane matching degree; at the same time, the focal lengths of the first to ninth lenses are specifically allocated. f 1- f 9. 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 image quality.

[0048] In this embodiment, the effective diameter of the first lens is set to 26 mm, and the radius of curvature of the object side is controlled at 18.3 mm, giving the first lens strong light transmission capability and initial light convergence capability. This structure not only effectively increases the amount of light entering the lens, but also optimizes the correction of axial chromatic aberration and spherical aberration through the setting of the front group of strong refractive surface, thus providing the necessary numerical aperture basis for high-resolution (e.g., 100 LP / mm) imaging, while ensuring the brightness uniformity of the edge field of view.

[0049] The first four lenses are arranged in a positive-negative-negative-positive power configuration, forming a double Gaussian variant that effectively balances the aberrations of the front group and reduces the burden on the rear lens group. The fourth lens, L4, is a positive lens with a relatively large center thickness. Its thick structure makes the incident angle of light more gradual when entering and leaving, especially the edge light. This helps to reduce coma, reduce astigmatism, and more effectively separate light of different wavelengths to achieve fine chromatic aberration control.

[0050] The rear lens group, consisting of the sixth lens L7 to the ninth lens L10, is tightly arranged to reduce air gaps and effectively control aberration propagation. The sixth, seventh, and eighth lenses form a cemented triplet lens, reducing the number of air / lens interfaces and lowering reflection loss. The four lenses have a uniform (thin) thickness at the center, and their optical power is arranged in a positive-negative-positive-positive pattern, positioned on the image side of the aperture stop. This helps the light entering the rear lens group to be closer to parallel to the optical axis, reducing the decrease in relative illumination at the edges and ensuring uniform brightness at the four corners of the image.

[0051] The maximum field of view of the lens in this embodiment Fov Approximately 75° corresponds to a half-field of view of 37.5°. tan37.5°≈0.76732698, tan1°≈0.017455065, and the ideal ratio≈0.76732698 / 0.017455065≈43.96. However, in this embodiment... Y m / Y The ratio is approximately 43.98, close to the ideal ratio, indicating that the image height changes with the field of view in a manner that is generally consistent with the expected value. h = f•tan ( ω The ideal relationship between the two indirectly reflects that the lens has extremely small distortion, with almost no visible barrel distortion and almost no pincushion distortion, resulting in high geometric fidelity of edge imaging. This characteristic allows the lens to obtain high-precision geometric information in industrial AOI, dimensional measurement and other applications without relying heavily on software distortion correction, making it suitable for industrial inspection imaging applications.

[0052] The lens design in this embodiment can be integrated with an electronic image sensor to form a camera device (line scan camera or area scan camera) for use in industrial inspection equipment (such as automated optical inspection equipment).

[0053] Based on a lens resolution of 100LP / mm, Figures 2 to 4 The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the first embodiment above at object distances of infinity, 300mm, and 100mm. The horizontal axis represents spatial frequency in line pairs per millimeter (LP / mm), and the vertical axis represents the OTF modulus (a dimensionless, normalized value). Figure 2 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 54%, and the OTF modulus of the near-edge field of view (0.7 field of view) represented by TS 3.3250 (mm) is approximately 54%. Figure 3 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 78%, while the OTF modulus of the near-edge field of view (0.9 field of view) represented by TS 4.2750 (mm) is approximately 68%. In millimeters, from... Figure 4 As can be seen, in millimeters, TS 0.0000 (mm) represents an OTF modulus of approximately 77% in the central field of view, while TS 4.2750 (mm) represents an OTF modulus of approximately 67% in the near-edge field of view (0.9 field of view), indicating that the lens can produce clear images. At object distances of 300mm or 100mm, the OTF modulus of the lens in the central and near-edge fields of view is balanced, and the relative attenuation between the edge and central fields of view is controlled within 15%, indicating balanced imaging quality across the 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 infinity, 300mm, and 100mm. The relative illumination diagram reflects the uniformity of illumination in the image. The horizontal axis represents the Y-field of view in millimeters (mm), and the vertical axis represents the relative illumination (a dimensionless, normalized value). Figure 5 It can be seen that the optical lens in this specific embodiment has a relative illumination of approximately 68% corresponding to a Y-field of view of 4.75mm, reflecting that the lens has high relative illumination and sufficient light intake. From Figure 6 It can be seen that the relative illumination corresponding to a Y-field of view of approximately 4.75mm is about 68%, reflecting that this lens has high relative illumination and sufficient light intake. From Figure 7 As can be seen, the relative illumination corresponding to a Y field of view of approximately 4.75mm is about 72%, which reflects that the lens has a high relative illumination and sufficient light intake, ensuring that even when the lens is used in relatively dark environments, there will be no vignetting at the edges of the actual image.

[0055] Figures 8 to 10 The images show the distortion of the lens in the first embodiment above at object distances of infinity, 300mm, and 100mm. 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 (dimensionless). Figure 8 The maximum distortion is approximately -0.9%. Figure 9 The maximum distortion is approximately -1.4%. Figure 10 The maximum distortion is approximately -3%, meaning that the distortion of the optical lens in this embodiment is well controlled, the image is not significantly distorted, and the image distortion is low.

[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, the lens arrangement of the lens is as follows: Figure 11As shown, compared with the first embodiment, the positive and negative optical power characteristics of the lens remain unchanged. The difference in lens surface shape is that the image-side surface S10 of the fifth lens L5 in the second embodiment is flat, while the image-side surface S17 of the ninth lens L10 is flat.

[0057] In this embodiment, the optical lens satisfies: 73°≤ Fov ≤77°, 9mm≤ Y m ≤10mm, 24mm≤2× D 1≤28mm, 0.18mm≤ Y 1≤0.25mm, 48mm≤ TTL ≤52mm, 5.8mm≤ f ≤6.8mm, 40mm≤ f 1≤46mm, -13.5mm≤ f 2≤-11.5mm, -8.8mm≤ f 3≤-6.8mm, 37.2mm≤ f 4≤39.5mm, 12.5mm≤ f 5≤14.8mm, 4.9mm≤ f 6≤6.8mm, -3.8mm≤ f 7 ≤ -2.8 mm, 8 mm ≤ f 8≤9.5mm, 15.3mm≤ f 9≤17.3mm, 40≤ Y m / Y 1≤46.5, 0.17≤ Y m / TTL ≤0.21, 7.3° / mm≤ Fov / Y m ≤8.3° / mm, 7.2≤ TTL / f ≤8.9, 3.8≤2× D 1 / f ≤4.6, 11.5≤ Y 1×180 / pi ≤13.5, 6.5≤ f 1 / f ≤7.5, -2.3≤ f 2 / f ≤-1.7, -1.5≤ f 3 / f ≤-1.05, 5.8≤ f 4 / f ≤6.6, 1.8≤ f 5 / f ≤2.6, 0.8≤ f 6 / f ≤1.1, -0.65≤ f 7 / f ≤-0.45, 1.2≤ f 8 / f ≤1.6, 2.3≤ f 9 / f ≤3, 7.6mm≤ bfl ≤8.8mm, 1.05≤ bfl / f ≤1.54, 0.14≤ bfl / TTL ≤0.18, 0.045° / mm 2 ≤ Fov / (2× D 1) / TTL ≤0.068° / mm 2 18mm≤ r 11 ≤22mm, 60mm≤ r 12 ≤74mm, air gap between the optical axes of the first and second lenses d S2-S3 The air gap between the optical axes of the eighth and ninth lenses is between 0 and 0.25 mm. d S15-S16 Between 1.5 and 1.88 mm; The optical axis distance from the object-side surface of the first lens L1 to the object-side surface of the fourth lens L4 d S1-S7 The center thickness of the first lens is between 13.2 mm and 14.2 mm. d S1-S2 The center thickness of the second lens is between 4.8 mm and 5.8 mm. d S3-S4 The center thickness of the third lens is between 2 mm and 2.65 mm. d S4-S5 Between 0.6mm and 1mm; The optical axis distance from the object-side surface S12 of the sixth lens L7 to the image-side surface S17 of the ninth lens L10 d S12-S17 The center thickness of the sixth lens is between 8.5 mm and 10.3 mm. d S12-S13 The center thickness of the seventh lens is between 2.2mm and 3.15mm. d S13-S14 The center thickness of the eighth lens is between 0.65mm and 0.95mm. d S14-S15 The center thickness of the ninth lens is between 2mm and 2.7mm. d S16-S17 Between 1.8mm and 2.3mm.

[0058] As described above, the sixth lens L7, the seventh lens L8, and the eighth lens L9 constitute a cemented lens, 1.64≤ -f 6 / f 7≤1.85, 2.4≤ -f 8 / f 7≤2.85, 18≤vd6-vd7≤25, 40≤vd8-vd7≤60, 40≤vd8-vd9≤60.

[0059] In this embodiment, the lens with the highest optical power among the positive lenses is the sixth lens, with a focal length between 5.6mm and 6.16mm and a radius of curvature of the image side between -5.5mm and -4mm; the lens with the highest optical power among the negative lenses is the seventh lens, with a focal length between -3.7mm and -3mm, a radius of curvature of the object side between -5.5mm and -4mm and a radius of curvature of the image side between 7mm and 7.75mm.

[0060] In this embodiment, among the nine lenses with optical power, the fourth lens has the largest center thickness and the smallest optical power; the center thickness of the fourth lens... d S7-S8 The radius of curvature of its side surface is between 8mm and 10mm. r 41 Between -32mm and -26mm, its image side radius of curvature r 42 Between -23mm and -16mm.

[0061] 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

[0062] In the table, if the radius of curvature is infinite, it means that the corresponding surface number represents a plane.

[0063] Among them, the distance D_1 between the image side of the aperture L6 with surface number S11 and the object side of the sixth lens L7, and the air distance D_2 between the optical axis of the ninth lens L10 with surface number S17 and the filter L11 are variable distances. The variable distance D_1 has a variable range of 0 mm to 0.6 mm, and the variable distance D_2 has a variable range of 6 mm to 7.5 mm.

[0064] Taking object distances of infinity, 300mm, and 100mm as examples, the corresponding interval distances D_1 and D_2 are shown in Table 6: Table 6. Variable Interval Distances Corresponding to the Three Object Distances in the Second Embodiment

[0065] The lens magnification is 0 when the object distance is infinity; 0.0194 when the object distance is 300mm; and 0.0522 when the object distance is 100mm.

[0066] 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

[0067] 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.

[0068] The table data in this embodiment uses rounding to obtain the calculated values.

[0069] Based on a lens resolution of 166LP / mm, Figures 12 to 14 The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the second embodiment above at object distances of infinity, 300mm, and 100mm. The horizontal axis represents spatial frequency in line pairs per millimeter (LP / mm), and the vertical axis represents the OTF modulus (a dimensionless, normalized value). Figure 12 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 62%, while the OTF modulus of the near-edge field of view (0.9 field of view) represented by TS 4.2750 (mm) is approximately 42%. Figure 13 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 63%, while the OTF modulus of the near-edge field of view (0.9 field of view) represented by TS 4.2750 (mm) is approximately 46%. Figure 14 As can be seen, in millimeters, TS 0.0000 (mm) represents a center field of view OTF modulus of approximately 65%, and TS 4.2750 (mm) represents a near edge field of view (0.9 field of view) OTF modulus of approximately 45%, indicating that the lens can produce clear images.

[0070] Figures 15 to 17The images above show the relative illumination curves of the lens in the second embodiment for three object distances: infinity, 300mm, and 100mm. The relative illumination diagram reflects the uniformity of illumination in the image. The horizontal axis represents the Y-field of view in millimeters (mm), and the vertical axis represents the relative illumination (dimensionless, normalized value). Figure 15 It can be seen that the optical lens in this specific embodiment has a relative illumination of approximately 70% corresponding to a Y-field of view of approximately 4.75mm, reflecting that the lens has high relative 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 4.75mm is approximately 72%, reflecting that this lens has high relative illumination and sufficient light intake. From Figure 17 As can be seen, the relative illumination corresponding to a Y field of view of approximately 4.75mm is approximately 74%, reflecting that the lens has a high relative illumination and sufficient light intake, ensuring that even when the lens is used in relatively dark environments, there will be no vignetting at the edges of the actual image.

[0071] Figures 18 to 20 The images show the distortion of the lens in the second embodiment above at object distances of infinity, 300mm, and 100mm. 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 (dimensionless). Figure 18 The maximum distortion is approximately -1.4%. Figure 19 The maximum distortion is approximately -2.3%. Figure 20 The maximum distortion is approximately -4.2%, meaning that the optical lens in this embodiment has relatively small distortion, the image is not significantly distorted, and the image distortion is low.

[0072] 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, the lens arrangement of the lens is as follows: Figure 21 As shown, compared with the first embodiment, the positive and negative optical power characteristics of the lens remain unchanged. The difference in lens surface shape is that the object side S5 of the third lens L3 in the third embodiment is convex, while the image side S17 of the ninth lens L10 is flat.

[0073] In this embodiment, the optical lens satisfies: 72°≤ Fov ≤78°, 9mm≤ Y m ≤10mm, 25mm≤2× D 1≤27mm, 0.19mm≤ Y 1≤0.24mm, 48mm≤ TTL ≤52mm, 5.9mm≤ f ≤6.6mm, 40mm≤f 1≤46mm,-15.1mm≤ f 2≤-13.1mm,-9.5mm≤ f 3≤-7.6mm,58mm≤ f 4≤62mm,13.3mm≤ f 5≤15.3mm,5mm≤ f 6≤6mm,-3.4mm≤ f 7≤-2.8mm,8mm≤ f 8≤9.5mm,15.1mm≤ f 9≤17.1mm,41≤ Y m / Y 1≤45,0.17≤ Y m / TTL ≤0.2,7.4° / mm≤ Fov / Y m ≤8.2° / mm,7.5≤ TTL / f ≤8.5,3.9≤2× D 1 / f ≤4.5,12≤ Y 1×180 / pi ≤13,6.5≤ f 1 / f ≤7.5,-2.4≤ f 2 / f ≤-2.1,-1.5≤ f 3 / f ≤-1.2,9≤ f 4 / f ≤10.2,2.1≤ f 5 / f ≤2.45,0.77≤ f 6 / f ≤0.98,-0.6≤ f 7 / f ≤-0.4,1.25≤ f 8 / f ≤1.55,2.3≤ f 9 / f ≤2.8,7.2mm≤ bfl ≤8.3mm,1≤ bfl / f ≤1.48,0.13≤ bfl / TTL ≤0.18,0.05° / mm 2 ≤ Fov / (2× D 1) / TTL ≤0.065° / mm 2 ,17mm≤r 11 ≤19.7mm, 56mm≤ r 12 ≤63mm, air gap between the optical axes of the first and second lenses d S2-S3 The air gap between the optical axes of the eighth and ninth lenses is between 0 and 0.15 mm. d S15-S16 Between 0.8 and 1.4 mm; The optical axis distance from the object-side surface of the first lens L1 to the object-side surface of the fourth lens L4 d S1-S7 The center thickness of the first lens is between 13.2 mm and 14.2 mm. d S1-S2 The center thickness of the second lens is between 5mm and 5.8mm. d S3-S4 The center thickness of the third lens is between 1.6 mm and 2.3 mm. d S4-S5 Between 0.6mm and 1mm; The optical axis distance from the object-side surface S12 of the sixth lens L7 to the image-side surface S17 of the ninth lens L10 d S12-S17 The center thickness of the sixth lens is between 10 mm and 11.6 mm. d S12-S13 The center thickness of the seventh lens is between 3mm and 3.6mm. d S13-S14 The center thickness of the eighth lens is between 0.65mm and 0.95mm. d S14-S15 The center thickness of the ninth lens is between 2.1mm and 2.75mm. d S16-S17 Between 2.8mm and 3.5mm.

[0074] As described above, the sixth lens L7, the seventh lens L8, and the eighth lens L9 constitute a cemented lens, with 1.68 ≤ -f 6 / f 7≤1.76, 2.4≤ -f 8 / f 7≤3, 18≤vd6-vd7≤22, 40≤vd8-vd7≤49, 20≤vd8-vd9≤32.

[0075] In this embodiment, the lens with the highest optical power among the positive lenses is the sixth lens, with a focal length between 5.1mm and 5.7mm and a radius of curvature of the image side between -4.8mm and -4mm; the lens with the highest optical power among the negative lenses is the seventh lens, with a focal length between -3.5mm and -2.8mm, a radius of curvature of the object side between -4.8mm and -4mm and a radius of curvature of the image side between 7.3mm and 8.3mm.

[0076] In this embodiment, among the nine lenses with optical power, the fourth lens has the largest center thickness and the smallest optical power; the center thickness of the fourth lens... d S7-S8 The radius of curvature of its lateral surface is between 9.2 mm and 10 mm. r 41 Between -24mm and -18mm, its image side radius of curvature r 42 Between -22mm and -17.5mm.

[0077] 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

[0078] In the table, if the radius of curvature is infinite, it means that the corresponding surface number represents a plane.

[0079] Among them, the distance D_1 between the image side of the aperture L6 with surface number S11 and the object side of the sixth lens L7, and the air distance D_2 between the optical axis of the ninth lens L10 with surface number S17 and the filter L11 are variable distances. The variable distance D_1 has a variable range of 0 mm to 0.6 mm, and the variable distance D_2 has a variable range of 5.3 mm to 6.9 mm.

[0080] Taking object distances of infinity, 300mm, and 100mm as examples, the corresponding interval distances D_1 and D_2 are shown in Table 10: Table 10 Variable Interval Distance Table Corresponding to Three Object Distances in the Third Embodiment

[0081] The lens magnification is 0 when the object distance is infinity; 0.0194 when the object distance is 300mm; and 0.0519 when the object distance is 100mm.

[0082] 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

[0083] 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

[0084] The table data in this embodiment uses rounding to obtain the calculated values.

[0085] Based on a lens resolution of 166LP / mm, Figures 22 to 24 The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the third embodiment above at object distances of infinity, 300mm, and 100mm. The horizontal axis represents spatial frequency (in line pairs / mm, i.e., LP / mm), and the vertical axis represents OTF modulus (a dimensionless normalized value). Figure 22 It can be seen that, in millimeters, TS 0.0000 (mm) represents a central field of view OTF modulus of approximately 60%, while TS 4.2750 (mm) represents a near-edge field of view (0.9 field of view) OTF modulus of approximately 50%. From... Figure 23 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 63%, while the OTF modulus of the near-edge field of view (0.9 field of view) represented by TS 4.2750 (mm) is approximately 58%. Figure 24 It can be seen that TS 0.0000 (mm) represents a center field of view OTF modulus of approximately 60%, and TS 4.2750 (mm) represents a near edge field of view (0.9 field of view) OTF modulus of approximately 51%, indicating that the lens can produce clear images.

[0086] Figures 25 to 27 The images above show the relative illumination curves of the lens in the third embodiment for three object distances: infinity, 300mm, and 100mm. The relative illumination diagram reflects the uniformity of illumination in the image. The horizontal axis represents the Y-field of view in millimeters (mm), and the vertical axis represents the relative illumination (a dimensionless, normalized value). Figure 25 It can be seen that the optical lens in this specific embodiment has a relative illumination of approximately 92% corresponding to a Y-field of view of approximately 4.75mm, reflecting that the lens has high relative illumination and sufficient light intake. From Figure 26 As can be seen, the relative illumination corresponding to a Y-field of view of approximately 4.75mm is approximately 98%, reflecting that this lens has high relative illumination and sufficient light intake. From Figure 27As can be seen, the relative illumination corresponding to a Y field of view of approximately 4.75mm is approximately 98%, reflecting that the lens has a high relative illumination and sufficient light intake, ensuring that even when the lens is used in relatively dark environments, there will be no vignetting at the edges of the actual image.

[0087] Figures 28 to 30 The images show the distortion of the lens in the third embodiment above at object distances of infinity, 300mm, and 100mm. 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 (dimensionless). Figure 28 The maximum distortion is approximately -1.3%. Figure 29 The maximum distortion is approximately -2.2%. Figure 30 The maximum distortion is approximately -4.2%, meaning that the optical lens in this embodiment has relatively small distortion and low image distortion.

[0088] Fourth embodiment: Tables 13, 14, 15, and 16 show a fourth numerical embodiment of the optical lens according to the present invention, in conjunction with... Figures 31 to 40 To understand the fourth embodiment, the lens arrangement of the lens is as follows: Figure 31 As shown, compared with the first embodiment, the positive and negative optical power characteristics of the lens remain unchanged, and the concave and convex surface shapes of the lens are the same. The difference is that the eighth lens L9 does not constitute a cemented lens, and only the sixth lens L7 and the seventh lens L8 constitute a cemented doublet lens.

[0089] In this embodiment, the optical lens satisfies: 60°≤ Fov ≤65°, 9mm≤ Y m ≤10mm, 21.5mm≤2× D 1≤24.5mm, 0.22mm≤ Y 1≤0.32mm, 47mm≤ TTL ≤54mm, 8mm≤ f ≤8.45mm, 39mm≤ f 1≤44mm, -23mm≤ f 2≤-19mm, -10.8mm≤ f 3≤-8.8mm, 48mm≤ f 4≤52mm, 18mm≤ f 5 ≤ 19.8 mm, 8 mm ≤ f 6≤9.5mm, -5.9mm≤ f 7≤-4.5mm, 11mm≤ f 8≤12.5mm, 21mm≤ f 9≤24mm, 34≤ Y m / Y 1≤36, 0.17≤ Y m / TTL ≤0.2, 6.1° / mm≤ Fov / Y m ≤7° / mm, 5.6≤ TTL / f ≤6.7, 2.7≤2× D 1 / f ≤2.85, 15≤ Y 1×180 / pi ≤16.3, 4.5≤ f 1 / f ≤5.5, -2.8≤ f 2 / f ≤-2.2, -1.3≤ f 3 / f ≤-1.1, 5.8≤ f 4 / f ≤6.5, 2.1≤ f 5 / f ≤2.5, 0.88≤ f 6 / f ≤1.2, -0.75≤ f 7 / f ≤-0.55, 1.25≤ f 8 / f ≤1.65, 2.5≤ f 9 / f ≤3, 7.6mm≤ bfl ≤10.8mm, 0.92≤ bfl / f ≤1.35, 0.13≤ bfl / TTL ≤0.23, 0.04° / mm 2 ≤ Fov / (2× D 1) / TTL ≤0.065° / mm 2 17mm≤ r 11 ≤18.5mm, 56mm≤ r 12 ≤60mm, air gap between the optical axes of the first and second lenses d S2-S3 The air gap between the optical axes of the eighth and ninth lenses is between 0.05 and 0.25 mm. d S16-S17 Between 0.1 and 0.3 mm; The optical axis distance from the object-side surface of the first lens L1 to the object-side surface of the fourth lens L4 d S1-S7The center thickness of the first lens is between 13.2 mm and 14.1 mm. d S1-S2 The center thickness of the second lens is between 4.2 mm and 5.1 mm. d S3-S4 The center thickness of the third lens is between 0.85 mm and 1.13 mm. d S4-S5 Between 0.85mm and 1.13mm; The optical axis distance from the object-side surface S12 of the sixth lens L7 to the image-side surface S17 of the ninth lens L10 d S12-S18 The center thickness of the sixth lens is between 9.4 mm and 10.2 mm. d S12-S13 The center thickness of the seventh lens is between 1.75mm and 2.15mm. d S13-S14 The center thickness of the eighth lens is between 0.85mm and 1.15mm. d S15-S16 The center thickness of the ninth lens is between 1.5mm and 1.9mm. d S17-S18 Between 4.15mm and 5.1mm.

[0090] As described above, the sixth lens L7 and the seventh lens L8 constitute a cemented lens, 1.4≤ -f 6 / f 7≤1.88, 30≤vd6-vd7≤42, 20≤vd8-vd7≤28.

[0091] In this embodiment, the lens with the highest optical power among the positive lenses is the sixth lens, with a focal length between 8.4mm and 9.3mm and a radius of curvature of the image side between -6.4mm and -5.6mm; the lens with the highest optical power among the negative lenses is the seventh lens, with a focal length between -5.5mm and -4.9mm, a radius of curvature of the object side between -6.4mm and -5.6mm and a radius of curvature of the image side between 20mm and 25mm.

[0092] In this embodiment, among the nine lenses with optical power, the fourth lens has the largest center thickness and the smallest optical power; the center thickness of the fourth lens... d S7-S8 The radius of curvature of its lateral surface is between 4.6 mm and 5.4 mm. r 41 Between -23mm and -18mm, its image side radius of curvature r 42 Between -19mm and -14.7mm.

[0093] In a specific numerical embodiment, the optical parameters of each lens, aperture, and IR filter are shown in Tables 13 to 16: Table 13 Lens optical parameters of the fourth embodiment

[0094] In the table, if the radius of curvature is infinite, it means that the corresponding surface number represents a plane.

[0095] Among them, the distance D_1 between the image side of the aperture L6 with surface number S11 and the object side of the sixth lens L7, and the air distance D_2 between the optical axis of the ninth lens L10 with surface number S17 and the filter L11 are variable distances. The variable distance D_1 has a variable range of 1.2mm to 2.3mm, and the variable distance D_2 has a variable range of 3.1mm to 6.3mm.

[0096] Taking object distances of infinity, 300mm, and 100mm as examples, the corresponding interval distances D_1 and D_2 are shown in Table 14: Table 14 Variable Interval Distance Table for the Three Object Distances in the Fourth Embodiment

[0097] The lens magnification is 0 when the object distance is infinity; 0.026 when the object distance is 300mm; and 0.061 when the object distance is 100mm.

[0098] Other optical parameters of the lens in this embodiment are shown in Table 15: Table 15 Other optical parameters of the lens at three object distances in the fourth embodiment

[0099] The optical parameter expressions of the lens in this embodiment are shown in Table 16: Table 16 Optical parameter expressions for the lens at three object distances in the fourth embodiment

[0100] The table data in this embodiment uses rounding to obtain the calculated values.

[0101] Based on a lens resolution of 166LP / mm, Figures 32 to 34 The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the fourth embodiment above at object distances of infinity, 300mm, and 100mm. The horizontal axis represents spatial frequency (in line pairs / mm, i.e., LP / mm), and the vertical axis represents OTF modulus (a dimensionless, normalized value). Figure 32It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 62%, while the OTF modulus of the near-edge field of view (0.7 field of view) represented by TS 3.3250 (mm) is approximately 55%. Figure 33 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 63%, while the OTF modulus of the near-edge field of view (0.9 field of view) represented by TS 4.2750 (mm) is approximately 54%. Figure 34 It can be seen that TS 0.0000 (mm) represents a central field of view OTF modulus of approximately 62%, and TS 4.7500 (mm) represents an edge field of view OTF modulus of approximately 47%, indicating that the lens can produce clear images.

[0102] Figures 35 to 37 The images above show the relative illumination curves of the lens in the fourth embodiment for three conditions: infinity, 300mm, and 100mm object distances. The relative illumination diagram reflects the uniformity of illumination in the image. The horizontal axis represents the Y-field of view in millimeters (mm), and the vertical axis represents the relative illumination (dimensionless, normalized value). Figure 35 As can be seen, the optical lens in this specific embodiment has a relative illumination of approximately 82% corresponding to a Y-field of view of approximately 4.75mm, reflecting that the lens has high relative illumination and sufficient light intake. From Figure 36 It can be seen that the relative illumination corresponding to a Y-field of view of approximately 4.75mm is approximately 85%, reflecting that this lens has high relative illumination and sufficient light intake. From Figure 37 As can be seen, the relative illumination corresponding to a Y field of view of approximately 4.75mm is approximately 78%, reflecting that the lens has a high relative illumination and sufficient light intake, ensuring that even when the lens is used in relatively dark environments, there will be no vignetting at the edges of the actual image.

[0103] Figures 38 to 40 The images above show the distortion of the lens in the fourth embodiment at object distances of infinity, 300mm, and 100mm. 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 (dimensionless). Figure 38 The maximum distortion is approximately 1%. Figure 39 The maximum distortion is approximately 0.4%. Figure 40 The maximum distortion is approximately -1.2%, meaning that the optical lens in this embodiment has low distortion and low image distortion.

[0104] Fifth embodiment: Tables 17, 18, 19, and 20 show a fifth numerical embodiment of the optical lens according to the present invention, in conjunction with... Figures 41 to 50 To understand the fifth embodiment, the lens arrangement of the lens is as follows: Figure 41 As shown, compared with the fourth embodiment, the positive and negative optical power characteristics of the lens remain unchanged. The difference in lens surface shape is that the object side surface S5 of the third lens L3 in the fifth embodiment is convex.

[0105] In this embodiment, the optical lens satisfies: 57°≤ Fov ≤63°, 9.2mm≤ Y m ≤9.8mm, 21mm≤2× D 1≤25mm, 0.25mm≤ Y 1≤0.33mm, 51mm≤ TTL ≤55mm, 7.9mm≤ f ≤8.6mm, 35mm≤ f 1≤39mm, -18.5mm≤ f 2≤-16.5mm, -11.3mm≤ f 3≤-9.3mm, 74mm≤ f 4≤78mm, 16.3mm≤ f 5 ≤ 18.3 mm, 7 mm ≤ f 6≤8.75mm, -5.6mm≤ f 7≤-4.6mm, 18mm≤ f 8≤22mm, 12.1mm≤ f 9≤14.1mm, 30≤ Y m / Y 1≤35, 0.165≤ Y m / TTL ≤0.195, 6° / mm≤ Fov / Y m ≤6.5° / mm, 6.1≤ TTL / f ≤6.85, 2.5≤2× D 1 / f ≤2.95, 16≤ Y 1×180 / pi ≤17.5, 4.2≤ f 1 / f ≤4.75, -2.4≤ f 2 / f ≤-2, -1.45≤ f 3 / f ≤-1.05, 9≤ f 4 / f ≤9.4, 1.95≤ f 5 / f ≤2.2, 0.85≤ f 6 / f≤1.05, -0.72≤ f 7 / f ≤-0.52, 2.25≤ f 8 / f ≤2.75, 1.5≤ f 9 / f ≤1.7, 9.8mm≤ bfl ≤11.2mm, 1.12≤ bfl / f ≤1.42, 0.18≤ bfl / TTL ≤0.21, 0.04° / mm 2 ≤ Fov / (2× D 1) / TTL ≤0.06° / mm 2 14.5mm≤ r 11 ≤16.5mm, 41mm≤ r 12 ≤47mm, air gap between the optical axes of the first and second lenses d S2-S3 The air gap between the optical axes of the eighth and ninth lenses is between 0 and 0.15 mm. d S16-S17 Between 1.6 and 2 mm; The optical axis distance from the object-side surface of the first lens L1 to the object-side surface of the fourth lens L4 d S1-S7 The center thickness of the first lens is between 13mm and 14mm. d S1-S2 The center thickness of the second lens is between 5mm and 5.8mm. d S3-S4 The center thickness of the third lens is between 1.3 mm and 2 mm. d S4-S5 Between 0.65mm and 0.95mm; The optical axis distance from the object-side surface S12 of the sixth lens L7 to the image-side surface S18 of the ninth lens L10 d S12-S18 The center thickness of the sixth lens is between 6.5 mm and 9.6 mm. d S12-S13 The center thickness of the seventh lens is between 2mm and 3mm. d S13-S14 The center thickness of the eighth lens is between 0.65mm and 0.95mm. d S15-S16 The center thickness of the ninth lens is between 1mm and 1.35mm. d S17-S18 Between 1.35mm and 1.75mm.

[0106] As mentioned above, for the sixth lens L7 and the seventh lens L8, 1.45≤ -f 6 / f 7≤1.65, 35≤vd6-vd7≤50, 28≤vd8-vd7≤36, 20≤vd8-vd9≤30.

[0107] In this embodiment, the lens with the highest optical power among the positive lenses is the sixth lens, with a focal length between 7.4mm and 8.4mm and a radius of curvature of the image side between -5.9mm and -5.1mm; the lens with the highest optical power among the negative lenses is the seventh lens, with a focal length between -5.5mm and -4.8mm, a radius of curvature of the object side between -5.9mm and -5.1mm and a radius of curvature of the image side between 17.6mm and 19.6mm.

[0108] In this embodiment, among the nine lenses with optical power, the fourth lens has the largest center thickness and the smallest optical power; the center thickness of the fourth lens... d S7-S8 The radius of curvature of its lateral surface is between 9.2 mm and 10.3 mm. r 41 Between -23mm and -19mm, its image side radius of curvature r 42 Between -22mm and -18mm.

[0109] In a specific numerical embodiment, the optical parameters of each lens, aperture, and IR filter are shown in Tables 17 to 20: Table 17 Lens optical parameters of the fifth embodiment

[0110] In the table, if the radius of curvature is infinite, it means that the corresponding surface number represents a plane.

[0111] Among them, the distance D_1 between the image side of the aperture L6 (surface number S11) and the object side of the sixth lens L7, and the air distance D_2 between the optical axis of the ninth lens L10 (surface number S17) and the filter L11 are variable distances. The variable distance D_1 has a variable range of 0.4 mm to 1.3 mm, and the variable distance D_2 has a variable range of 5.3 mm to 6.6 mm.

[0112] Taking object distances of infinity, 300mm, and 100mm as examples, the corresponding interval distances D_1 and D_2 are shown in Table 18: Table 18 Variable Interval Distance Table Corresponding to the Three Object Distances in the Fifth Embodiment

[0113] The lens magnification is 0 when the object distance is infinity; 0.0256 when the object distance is 300mm; and 0.0685 when the object distance is 100mm.

[0114] Other optical parameters of the lens in this embodiment are shown in Table 19: Table 19 Other optical parameters of the lens at three object distances in the fifth embodiment

[0115] The optical parameter expressions for the lens in this embodiment are shown in Table 20: Table 20 Optical parameter expressions for the lens at three object distances in the fifth embodiment

[0116] The table data in this embodiment uses rounding to obtain the calculated values.

[0117] Based on a lens resolution of 166LP / mm, Figures 42 to 44 The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the fifth embodiment above at object distances of infinity, 300mm, and 100mm. The horizontal axis represents spatial frequency (in line pairs / mm, i.e., LP / mm), and the vertical axis represents OTF modulus (a dimensionless, normalized value). Figure 42 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 61%, while the OTF modulus of the peripheral field of view represented by TS 4.7500 (mm) is approximately 53%. From... Figure 43 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS0.0000 (mm) is approximately 60%, while the OTF modulus of the peripheral field of view represented by TS4.7500 (mm) is approximately 58%. From... Figure 44 It can be seen that TS 0.0000 (mm) represents a central field of view OTF modulus of approximately 63%, and TS 4.7500 (mm) represents an edge field of view OTF modulus of approximately 58%, indicating that the lens can produce clear images.

[0118] Figures 45 to 47 The images above show the relative illumination curves of the lens in the fifth embodiment for three conditions: infinity, 300mm, and 100mm object distances. The relative illumination diagram reflects the uniformity of illumination in the image. The horizontal axis represents the Y-field of view in millimeters (mm), and the vertical axis represents the relative illumination (a dimensionless, normalized value). Figure 45It can be seen that the optical lens in this specific embodiment has a relative illumination of approximately 90% corresponding to a Y-field of view of approximately 4.75mm, reflecting that the lens has high relative illumination and sufficient light intake. From Figure 46 As can be seen, the relative illumination corresponding to a Y-field of view of approximately 4.75mm is approximately 95%, reflecting that this lens has high relative illumination and sufficient light intake. From Figure 47 As can be seen, the relative illumination corresponding to a Y field of view of approximately 4.75mm is approximately 97%, reflecting that the lens has a high relative illumination and sufficient light intake, ensuring that even when the lens is used in relatively dark environments, there will be no vignetting at the edges of the actual image.

[0119] Figures 48 to 50 The images above show the distortion of the lens in the fifth embodiment at object distances of infinity, 300mm, and 100mm. 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 (dimensionless). Figure 48 The maximum distortion is approximately -1%. Figure 49 The maximum distortion is approximately -1.8%. Figure 50 The maximum distortion is approximately -3%, meaning that the optical lens in this embodiment has relatively small distortion and low image distortion.

[0120] Sixth embodiment: Tables 21, 22, 23, and 24 show a sixth numerical embodiment of the optical lens according to the present invention, in conjunction with... Figures 21 to 30 To understand the sixth embodiment, the lens arrangement of the lens is as follows: Figure 51 As shown, compared with the fourth embodiment, the positive and negative optical power characteristics of the lens remain unchanged. The difference in lens surface shape is that the object side surface S17 of the ninth lens L10 in the sixth embodiment is flat.

[0121] In this embodiment, the optical lens satisfies: 60°≤ Fov ≤66°, 9.2mm≤ Y m ≤9.8mm, 21mm≤2× D 1≤25mm, 0.26mm≤ Y 1≤0.285mm, 51mm≤ TTL ≤55mm, 7.2mm≤ f ≤8.3mm, 40mm≤ f 1≤43mm, -23mm≤ f 2≤-19mm, -11mm≤ f 3≤-9mm, 46mm≤ f 4≤54mm, 17.5mm≤ f 5≤20.3mm, 8mm≤ f6≤9.6mm, -5.7mm≤ f 7 ≤ -4.8 mm, 10.8 mm ≤ f 8≤12.5mm, 21mm≤ f 9≤23.9mm, 32≤ Y m / Y 1≤36, 0.17≤ Y m / TTL ≤0.19, 6.2° / mm≤ Fov / Y m ≤7° / mm, 6.3≤ TTL / f ≤7.3, 2.8≤2× D 1 / f ≤3.1, 15≤ Y 1×180 / pi ≤16.3, 5≤ f 1 / f ≤5.55, -2.9≤ f 2 / f ≤-2.55, -1.4≤ f 3 / f ≤-1.16, 6≤ f 4 / f ≤6.9, 2.22≤ f 5 / f ≤2.66, 1.08≤ f 6 / f ≤1.2, -0.8≤ f 7 / f ≤-0.6, 1.3≤ f 8 / f ≤1.75, 2.7≤ f 9 / f ≤3.1, 10.3mm≤ bfl ≤11.7mm, 1.25≤ bfl / f ≤1.6, 0.18≤ bfl / TTL ≤0.22, 0.05° / mm 2 ≤ Fov / (2× D 1) / TTL ≤0.06° / mm 2 18mm≤ r 11 ≤21mm, 100mm≤ r 12 ≤130mm, air gap between the optical axes of the first and second lenses d S2-S3The air gap between the optical axes of the eighth and ninth lenses is between 0 and 0.15 mm. d S16-S17 Between 0.7 and 1 mm; The optical axis distance from the object-side surface of the first lens L1 to the object-side surface of the fourth lens L4 d S1-S7 The center thickness of the first lens is between 12mm and 13mm. d S1-S2 The center thickness of the second lens is between 4mm and 5mm. d S3-S4 The center thickness of the third lens is between 1 mm and 1.36 mm. d S4-S5 Between 0.65mm and 0.95mm; The optical axis distance from the object-side surface S12 of the sixth lens L7 to the image-side surface S17 of the ninth lens L10 d S12-S18 The center thickness of the sixth lens is between 6 mm and 7.2 mm. d S12-S13 The center thickness of the seventh lens is between 1.8mm and 2.2mm. d S13-S14 The center thickness of the eighth lens is between 0.7mm and 0.9mm. d S15-S16 The center thickness of the ninth lens is between 1.1mm and 1.5mm. d S17-S18 Between 0.9mm and 1.05mm.

[0122] As described above, the sixth lens L7 and the seventh lens L8 constitute a cemented lens, 1.6≤ -f 6 / f 7≤1.75, 35≤vd6-vd7≤55.

[0123] In this embodiment, the lens with the highest optical power among the positive lenses is the sixth lens, with a focal length between 8.3mm and 9.3mm and a radius of curvature of the image side between -6mm and -5.5mm; the lens with the highest optical power among the negative lenses is the seventh lens, with a focal length between -5.6mm and -4.8mm, a radius of curvature of the object side between -6mm and -5.5mm and a radius of curvature of the image side between 13.2mm and 14.3mm.

[0124] In this embodiment, among the nine lenses with optical power, the fourth lens has the largest center thickness and the smallest optical power; the center thickness of the fourth lens... d S7-S8 The radius of curvature of its lateral surface is between 10 mm and 11.2 mm. r41 Between -33mm and -27mm, its image side radius of curvature r 42 Between -23mm and -19mm.

[0125] In a specific numerical embodiment, the optical parameters of each lens, aperture, and IR filter are shown in Tables 21 to 24: Table 21 Lens optical parameters of the sixth embodiment

[0126] In the table, if the radius of curvature is infinite, it means that the corresponding surface number represents a plane.

[0127] Among them, the distance D_1 between the image side of the aperture L6 with surface number S11 and the object side of the sixth lens L7, and the air distance D_2 between the optical axis of the ninth lens L10 with surface number S17 and the filter L11 are variable distances. The variable distance D_1 has a variable range of 0 mm to 0.8 mm, and the variable distance D_2 has a variable range of 6 mm to 7 mm.

[0128] Taking object distances of infinity, 300mm, and 100mm as examples, the corresponding interval distances D_1 and D_2 are shown in Table 22: Table 22 Variable Interval Distance Table for the Three Object Distances in the Sixth Embodiment

[0129] The lens magnification is 0 when the object distance is infinity; 0.0242 when the object distance is 300mm; and 0.0656 when the object distance is 100mm.

[0130] Other optical parameters of the lens in this embodiment are shown in Table 23: Table 23 Other optical parameters of the lens at three object distances in the sixth embodiment

[0131] The optical parameter expressions for the lens in this embodiment are shown in Table 24: Table 24 Optical parameter expressions for the lens at three object distances in the sixth embodiment

[0132] The table data in this embodiment uses rounding to obtain the calculated values.

[0133] Based on a lens resolution of 166LP / mm, Figures 52 to 54The images show the MTF (Modulation Transfer Function) frequency curves of the lens in the sixth embodiment above at object distances of infinity, 300mm, and 100mm. The horizontal axis represents spatial frequency (in line pairs / mm, i.e., LP / mm), and the vertical axis represents OTF modulus (a dimensionless, normalized value). Figure 52 It can be seen that, in millimeters, TS 0.0000 (mm) represents a central field of view OTF modulus of approximately 60%, while TS 4.2750 (mm) represents a near-edge field of view (0.9 field of view) OTF modulus of approximately 49%. From... Figure 53 It can be seen that, in millimeters, the OTF modulus of the central field of view represented by TS 0.0000 (mm) is approximately 63%, while the OTF modulus of the peripheral field of view represented by TS 4.7500 (mm) is approximately 50%. From... Figure 54 It can be seen that TS 0.0000 (mm) represents a central field of view OTF modulus of approximately 64%, and TS 4.7500 (mm) represents an edge field of view OTF modulus of approximately 48%, indicating that the lens can produce clear images.

[0134] Figures 55 to 57 The images above show the relative illumination curves of the lens in the sixth embodiment for three object distances: infinity, 300mm, and 100mm. The relative illumination diagram reflects the uniformity of illumination in the image. The horizontal axis represents the Y-field of view in millimeters (mm), and the vertical axis represents the relative illumination (dimensionless, normalized value). Figure 55 It can be seen that the optical lens in this specific embodiment has a relative illumination of approximately 84% corresponding to a Y-field of view of approximately 4.75mm, reflecting that the lens has high relative illumination and sufficient light intake. From Figure 56 As can be seen, the relative illumination corresponding to a Y-field of view of approximately 4.75mm is approximately 86%, reflecting that this lens has high relative illumination and sufficient light intake. From Figure 57 As can be seen, the relative illumination corresponding to a Y field of view of approximately 4.75mm is approximately 88%, reflecting that the lens has a high relative illumination and sufficient light intake, ensuring that even when the lens is used in relatively dark environments, there will be no vignetting at the edges of the actual image.

[0135] Figures 58 to 60 The images above show the distortion of the lens in the sixth embodiment at object distances of infinity, 300mm, and 100mm. 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 (dimensionless). Figure 58 The maximum distortion is approximately -1.1%. Figure 59 The maximum distortion is approximately -1.8%. Figure 60The maximum distortion is approximately -3%, meaning that the optical lens in this embodiment has relatively small distortion and low image distortion.

[0136] 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.

[0137] 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 nine 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, and a ninth lens arranged sequentially along the optical axis from the object plane to the image plane, characterized in that: The optical powers of the first to the ninth lenses are positive, negative, negative, positive, positive, positive, negative, positive, positive, and positive, respectively. The first and second lenses are both meniscus lenses convex to the object surface; the image-side surface of the third lens is concave near the optical axis; the fourth lens is a meniscus lens convex to the image surface; the object-side surface of the fifth lens is convex near the optical axis; the sixth lens is a biconvex lens; the seventh lens is a biconcave lens; the image-side surface of the eighth lens is convex near the optical axis; and the ninth lens is a biconvex lens or a plano-convex lens. The optical lens satisfies: 5.5mm ≤ f ≤8.8mm, 55°≤ Fov ≤80°, 46mm≤ TTL ≤55mm, 21mm≤2× D 1≤28mm, where, f This refers to the entire focal length of the lens. Fov The maximum field of view of the lens. TTL The distance from the vertex of the object side of the first lens to the imaging surface on the optical axis is 2× D 1 represents the effective diameter of the first lens; The optical lens also satisfies: 0.04≤ Fov / (2× D 1) / TTL ≤0.065, 2.5≤2× D 1 / f ≤4.6, 6≤ Fov / Y m ≤8.7, and 0.165≤ Y m / TTL ≤0.21, 11.5≤ Y 1×180 / pi ≤17.5, 5.6≤ TTL / f ≤9, where, Y m The image height corresponding to the maximum field of view. Y 1 represents the lens image height when the half-field of view is 1°. pi Pi is the mathematical constant of a circle.

2. The optical lens according to claim 1, characterized in that, The optical lens can support a spatial frequency of not less than 100LP / mm in the object distance range from 100mm to infinity, and at a spatial frequency of 100LP / mm, the MTF curves corresponding to each object distance satisfy that the OTF modulus of the center field of view and the 0.5 field of view is not less than 0.

5.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 9mm≤ Y m ≤10mm, 0.18mm≤ Y 1≤0.33mm, 30≤ Y m / Y 1≤48, where, Y m The image height corresponding to the maximum field of view. Y 1 represents the lens image height when the half field of view is 1°.

4. The optical lens according to claim 1, characterized in that, The focal length of each lens satisfies the following condition: 4.2 ≤ f 1 / f ≤7.5, -2.9≤ f 2 / f ≤-1.7, -1.6≤ f 3 / f ≤-1.05, 5.8≤ f 4 / f ≤10.2, 1.8≤ f 5 / f ≤2.7, 0.75≤ f 6 / f ≤1.2, -0.8≤ f 7 / f ≤-0.4, 1.2≤ f 8 / f ≤2.75, 1.5≤ f 9 / f ≤3.1, 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 is the focal length of the seventh lens. f 8 represents the focal length of the eighth lens. f 9 represents the focal length of the ninth lens.

5. The optical lens according to claim 1, characterized in that, 14.5mm≤ r 11 ≤24mm, 41mm≤ r 12 ≤130mm, where, r 11 Let be the radius of curvature of the object-side surface of the first lens. r 12 Let be the radius of curvature of the image-side surface of the first lens.

6. The optical lens according to claim 1, characterized in that, The optical axis distance from the object side of the first lens to the object side of the fourth lens is between 11.8 mm and 14.9 mm; the center thickness of the first lens is between 4 mm and 6.6 mm; the center thickness of the second lens is between 0.85 mm and 2.65 mm; and the center thickness of the third lens is between 0.6 mm and 1.2 mm. The optical axis distance from the object side of the sixth lens to the image side of the ninth lens is between 6 mm and 11.3 mm. The center thickness of the sixth lens is between 1.5 mm and 3.6 mm. The center thickness of the seventh lens is between 0.65 mm and 1.25 mm. The center thickness of the eighth lens is between 1 mm and 2.75 mm. The center thickness of the ninth lens is between 0.9 mm and 5.1 mm.

7. The optical lens according to claim 1, characterized in that, Among the nine lenses with optical power, the sixth lens has the highest optical power among the positive lenses. Its focal length is between 5mm and 9.4mm, and its radius of curvature of the image side is between -7mm and -3.8mm. The seventh lens is the negative lens with the highest optical power. Its focal length is between -5.6mm and -2.8mm, its object side radius of curvature is between -7mm and -3.8mm, and its image side radius of curvature is between 6.5mm and 25mm.

8. The optical lens according to claim 1, characterized in that, The focal length of each lens satisfies the following condition: 35mm ≤ f 1≤46mm, -23mm≤ f 2≤-11mm, -11.3mm≤ f 3≤-6.8mm, 36mm≤ f 4≤78mm, 12.5mm≤ f 5≤20.3mm, 4.9mm≤ f 6≤9.6mm, -5.9mm≤ f 7 ≤ -2.8 mm, 8 mm ≤ f 8≤22mm, 12mm≤ f 9≤24mm, 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 is the focal length of the seventh lens. f 8 represents the focal length of the eighth lens. f 9 represents the focal length of the ninth lens.

9. The optical lens according to claim 1, characterized in that, The optical axis air gap between the first lens and the second lens is between 0 and 0.35 mm, the optical axis air gap between the sixth lens and the seventh lens is between 0 and 0.35 mm, the optical axis air gap between the seventh lens and the eighth lens is between 0 and 0.2 mm, and the optical axis air gap between the eighth lens and the ninth lens is between 0 and 2 mm.

10. The optical lens according to claim 1, characterized in that, Among the nine lenses with optical power, the lens with the largest central thickness is the fourth lens, and the lens with the smallest optical power is also the fourth lens. The center thickness of the fourth lens is between 4.6 mm and 11.2 mm, the radius of curvature of its object side is between -33 mm and -16 mm, and the radius of curvature of its image side is between -23 mm and -12 mm.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 7.2mm ≤ bfl ≤11.7mm, 0.92≤ bfl / f ≤1.74, 0.13≤ bfl / TTL ≤0.23, 5.6≤ TTL / f ≤9, where, bfl This is the rear focal length of the lens.

12. The optical lens according to claim 1, characterized in that, The sixth and seventh lenses constitute a cemented lens, and the optical lens satisfies: 1.4 ≤ -f 6 / f 7≤1.88, 18≤vd6-vd7≤55, 20≤vd8-vd7≤60, where, f 6 is the focal length of the sixth lens. f 7 is the focal length of the seventh lens, vd6 is the Abbe constant of the sixth lens, vd7 is the Abbe constant of the seventh lens, and vd8 is the Abbe constant of the eighth lens. And / or, the seventh lens and the eighth lens constitute a cemented lens, and the optical lens satisfies: 2.4 ≤ -f 8 / f 7≤3, 20≤vd8-vd7≤60, 20≤vd8-vd9≤62, where, f 7 is the focal length of the seventh lens. f 8 is the focal length of the eighth lens, vd7 is the Abbe constant of the seventh lens, vd8 is the Abbe constant of the eighth lens, and vd9 is the Abbe constant of the ninth lens.

13. The optical lens according to claim 1, characterized in that, All nine lenses with optical power are spherical mirrors.

14. The optical lens according to any one of claims 1 to 13, characterized in that, The optical lens also includes an aperture stop disposed between the fifth lens and the sixth lens, and the air gap between the aperture stop and the sixth lens is adjustable in the range of 0 mm to 2.5 mm; And / or, the optical lens further includes a filter disposed between the ninth lens and the imaging surface, wherein the air gap between the optical axis of the ninth lens and the filter is adjustable in the range of 3 mm to 9.5 mm.

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

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

Images