Industrial lens

Abstract

The industrial lens comprises a focusing lens group, a diaphragm and a fixed lens group which are sequentially arranged from an object plane to an image plane along an optical axis, the position of the focusing lens group can float along the optical axis, and the position of the fixed lens group is fixed; the focusing lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis; the fixed lens group comprises a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from the object plane to the image plane along the optical axis. The focusing lens group moves along the optical axis to realize focusing of different object distances, and the fixed lens group is fixed, so that the influence of focusing to different object distances on resolution can be reduced, and the balance of the image quality of each working distance is ensured. And the number of the lenses in each lens group is reasonably set, so that the industrial lens with high image quality imaging performance can be realized.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of optical devices, and in particular to an industrial lens. Background Art

[0002] As a core visual component in industrial automation systems, industrial lenses play a crucial role as the "eyes of the machine" in intelligent manufacturing. Their performance directly determines the accuracy and reliability of the entire visual inspection system and must meet the stringent standards unique to industrial scenarios. Within a limited footprint, they must ensure continuous focus across a wide range of object distances, minimize optical distortion, and maintain extremely high spatial resolution. However, existing industrial lenses generally suffer from a narrow focus range, high distortion, and low edge resolution. The market urgently needs an industrial lens that can address these technical challenges to enable the iterative upgrade of high-precision visual inspection equipment.

[0003] Therefore, developing an industrial lens that can provide a larger imaging range, smaller distortion, and higher clarity has become an urgent need for technical personnel in this field. Summary of the Invention

[0004] The present invention provides an industrial lens, which realizes an industrial lens with a larger imaging range, smaller distortion and higher definition.

[0005] An embodiment of the present invention provides an industrial lens, comprising a focus lens group, an aperture, and a fixed lens group arranged in sequence along an optical axis from an object plane to an image plane, wherein the focus lens group can float along the optical axis, and the fixed lens group is fixed.

[0006] The focusing lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object plane to the image plane along the optical axis;

[0007] The fixed lens group includes a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the optical axis from the object plane to the image plane.

[0008] Optionally, the first lens is a positive power lens, the second lens is a positive power lens, the third lens is a positive power lens, the fourth lens is a negative power lens, the fifth lens is a positive power lens, the sixth lens is a negative power lens, the seventh lens is a negative power lens, the eighth lens is a negative power lens, the ninth lens is a positive power lens, and the tenth lens is a positive power lens.

[0009] Optionally, the focal length of the first lens is F1, the focal length of the second lens is F2, the focal length of the third lens is F3, the focal length of the fourth lens is F4, the focal length of the fifth lens is F5, the focal length of the sixth lens is F6, the focal length of the seventh lens is F7, the focal length of the eighth lens is F8, the focal length of the ninth lens is F9, the focal length of the tenth lens is F10, and the total focal length of the industrial lens is F;

[0010] Among them, 1.921 <F1 / F<2.292,2.552<F2 / F<3.431,1.010<F3 / F<1.798,

[0011] -1.165 <F4 / F<-0.549,0.359<F5 / F<0.494,-3.056<F6 / F<-2.375,

[0012] -0.868 <F7 / F<-0.645,-0.466<F8 / F<-0.389,0.761<F9 / F<0.917,

[0013] 0.598 <F10 / F<0.966。

[0014] Optionally, the third lens and the fourth lens are cemented together to form a first cemented lens group, and the fifth lens and the sixth lens are cemented together to form a second cemented lens group.

[0015] Optionally, the Abbe number of the third lens is VD3, the Abbe number of the fourth lens is VD4, the focal power of the third lens is Φ3, the focal power of the fourth lens is Φ4, and the focal power of the first cemented lens group is Φ3-4;

[0016] Of these, 45,000 <VD3<58.873,38.803<VD4<40.001,

[0017] -0.536≤1000*(Φ3 / VD3+Φ4 / VD4)≤-0.332, 10*|Φ3+Φ4-Φ3-4|<0.034.

[0018] Optionally, the Abbe number of the fifth lens is VD5, the Abbe number of the sixth lens is VD6, the focal power of the fifth lens is Φ5, the focal power of the sixth lens is Φ6, and the focal power of the second cemented lens group is Φ5-6;

[0019] Of these, 80,000 <VD5<92.968,14.997<VD6<25.866,

[0020] 0.052≤1000*(Φ5 / VD5+Φ6 / VD6)≤0.286, 10*|Φ5+Φ6-Φ5-6|<0.104.

[0021] Optionally, the combined focal length of the first lens to the seventh lens is F1-7, and the combined focal length of the eighth lens to the tenth lens is F8-10;

[0022] Among them, 1.100 <F1-7 / F8-10<1.373。

[0023] Optionally, the back focal length of the industrial lens is BFL, the total optical length is TTL, and the total focal length is F;

[0024] Among them, 0.240 <BFL / F<0.254,0.522<F / TTL<0.552。

[0025] Optionally, the first lens includes a first object-side surface close to the object plane and a first image-side surface close to the image plane, the first object-side surface is convex, and the first image-side surface is concave;

[0026] The second lens includes a second object-side surface close to the object plane and a second image-side surface close to the image plane, the second object-side surface is convex, and the second image-side surface is concave;

[0027] The third lens comprises a third object-side surface close to the object plane and a third image-side surface close to the image plane, the third object-side surface is convex, and the third image-side surface is concave;

[0028] The fourth lens comprises a fourth object-side surface close to the object plane and a fourth image-side surface close to the image plane, the fourth object-side surface is convex, and the fourth image-side surface is concave;

[0029] The fifth lens comprises a fifth object-side surface close to the object plane and a fifth image-side surface close to the image plane, the fifth object-side surface is a convex surface, and the fifth image-side surface is a convex surface;

[0030] The sixth lens comprises a sixth object-side surface close to the object plane and a sixth image-side surface close to the image plane, the sixth object-side surface is concave, and the sixth image-side surface is convex;

[0031] The seventh lens element includes a seventh object-side surface close to the object plane and a seventh image-side surface close to the image plane, the seventh object-side surface is convex, and the seventh image-side surface is concave;

[0032] The eighth lens comprises an eighth object-side surface close to the object plane and an eighth image-side surface close to the image plane, the eighth object-side surface is concave, and the eighth image-side surface is concave;

[0033] The ninth lens comprises a ninth object-side surface close to the object plane and a ninth image-side surface close to the image plane, wherein the ninth object-side surface is concave and the ninth image-side surface is convex.

[0034] The tenth lens includes a tenth object-side surface close to the object plane and a tenth image-side surface close to the image plane. The tenth object-side surface is a convex surface, and the tenth image-side surface is a concave surface.

[0035] Optionally, the first lens to the tenth lens are all glass spherical lenses.

[0036] The industrial lens provided by the embodiment of the present invention is provided with a focus lens group that can float along the optical axis, ensuring that focusing at different working distances can be achieved and clear imaging at different working object distances can be achieved. Furthermore, the focus lens group includes six floating focus lenses, which can ensure a larger focus object distance range and smaller distortion during the focusing process. Specifically, it can achieve the requirements of focusing at an object distance of 100mm to infinity and optical distortion less than or equal to 0.3%, ensuring a lens design with a larger imaging range and smaller distortion. Furthermore, the fixed lens group is fixed and does not move, which can reduce the impact of focusing at different object distances on the resolution, ensure that the image quality at each working distance is balanced, and ensure that a higher-definition lens design can be achieved.

[0037] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 This is a schematic structural diagram of an industrial lens provided by the first embodiment of the present invention at an optimal object distance;

[0040] Figure 2 Schematic diagram of a light fan of an industrial lens at an optimal object distance provided by the first embodiment of the present invention;

[0041] Figure 3 1 is a schematic diagram of a field curvature distortion curve of an industrial lens at an optimal object distance provided by the first embodiment of the present invention;

[0042] Figure 41 is a schematic diagram of an MTF curve of an industrial lens at an optimal object distance provided by the first embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of an axial chromatic aberration curve of an industrial lens at an optimal object distance provided by the first embodiment of the present invention;

[0044] Figure 6 1 is a schematic diagram of a vertical axis chromatic aberration curve of an industrial lens at an optimal object distance provided by the first embodiment of the present invention;

[0045] Figure 7 This is a schematic structural diagram of an industrial lens provided by the second embodiment of the present invention at an optimal object distance;

[0046] Figure 8 This is a schematic diagram of a light fan of an industrial lens at an optimal object distance provided by the second embodiment of the present invention;

[0047] Figure 9 1 is a schematic diagram of a field curvature distortion curve of an industrial lens at an optimal object distance provided by the second embodiment of the present invention;

[0048] Figure 10 Schematic diagram of the MTF curve of an industrial lens at an optimal object distance provided by the second embodiment of the present invention;

[0049] Figure 11 This is a schematic diagram of an axial chromatic aberration curve of an industrial lens at an optimal object distance provided by the second embodiment of the present invention;

[0050] Figure 12 1 is a schematic diagram of a vertical axis chromatic aberration curve of an industrial lens at an optimal object distance provided by the second embodiment of the present invention;

[0051] Figure 13 This is a schematic structural diagram of an industrial lens at an optimal object distance provided by the third embodiment of the present invention;

[0052] Figure 14 This is a schematic diagram of a light fan of an industrial lens at an optimal object distance provided by the third embodiment of the present invention;

[0053] Figure 15 1 is a schematic diagram of a field curvature distortion curve of an industrial lens at an optimal object distance provided by the third embodiment of the present invention;

[0054] Figure 16 1 is a schematic diagram of an MTF curve of an industrial lens at an optimal object distance provided by the third embodiment of the present invention;

[0055] Figure 17 This is a schematic diagram of an axial chromatic aberration curve of an industrial lens at an optimal object distance provided by the third embodiment of the present invention;

[0056] Figure 18 This is a schematic diagram of a vertical axis chromatic aberration curve of an industrial lens at an optimal object distance provided by the third embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0058] Example 1

[0059] Figure 1 Schematic diagram of the structure of an industrial lens at an optimal object distance provided by the first embodiment of the present invention. Figure 1 As shown, the industrial lens provided by the embodiment of the present invention includes a focusing lens group S1 and a fixed lens group S2 arranged in sequence along the optical axis from the object plane to the image plane. The position of the focusing lens group S1 can float along the optical axis, and the position of the fixed lens group S2 is fixed; the focusing lens group S1 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105 and a sixth lens 106 arranged in sequence along the optical axis from the object plane to the image plane; the fixed lens group S2 includes a seventh lens 107, an eighth lens 108, a ninth lens 109 and a tenth lens 110 arranged in sequence along the optical axis from the object plane to the image plane.

[0060] Specifically, the industrial lens provided by the embodiment of the present invention includes a focusing lens group S1 and a fixed lens group S2. Among them, the focusing lens group S1 can be understood as a lens group whose lens position changes, and the fixed lens group S2 can be understood as a lens whose lens position is fixed and does not change. The focusing lens group S1 moves between the object plane and the fixed lens group S2. The position of the focusing lens group S1 changes to ensure that the industrial lens can achieve focus at different object distances and ensure clear imaging at different object distances. Specifically, in the case of close object distance focusing, the focusing lens group S1 is close to the object plane; in the case of infinity focusing, the focusing lens group S1 is close to the fixed lens group S2. In addition, since the position of the fixed lens group S2 remains stationary, under different working distances, the aberration change caused by the forward and backward movement of the focusing lens group S1 will be reduced because the fixed lens group S2 is fixed, thereby reducing the influence of the movement of the focusing lens group S1 on the aberration, thereby ensuring that the image quality of each working distance is balanced and the imaging quality is guaranteed.

[0061] Furthermore, the focusing lens group S1 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105 and a sixth lens 106, that is, the industrial lens includes six movable focusing lenses. In this way, focusing can be achieved by moving multiple lenses, and focusing by moving multiple lenses can achieve a larger focus object distance range and smaller distortion during the focusing process. Specifically, it can achieve focusing of 100mm to infinity object distance and optical distortion less than or equal to 0.3%.

[0062] Furthermore, the fixed lens group S2 includes a seventh lens 107, an eighth lens 108, a ninth lens 109 and a tenth lens 110, that is, the industrial lens includes four fixed lenses. By fixing the four lenses, the influence of the movement process of the focusing lens group S1 on the aberration is weakened, ensuring that the image quality at each working distance is balanced, ensuring the imaging quality, and ensuring that a higher-definition lens design can be achieved.

[0063] In addition, the arrangement of ten lenses with optical focal length ensures that the number of lenses in the optical system is set reasonably. The lens volume will not be larger due to too many lenses, nor will the aberration of a single lens due to the large optical focal length due to too few lenses be larger. While ensuring the miniaturization of the optical system, the imaging aberration is small and the imaging quality is high.

[0064] For further reference, Figure 1 As shown, the industrial lens of the embodiment of the present invention may also include an aperture STO and a filter 111. The aperture STO is arranged in the optical path between the focusing lens group S1 and the fixed lens group S2, and the filter 111 is arranged in the optical path between the tenth lens 110 and the image plane. The aperture STO can adjust the propagation direction of the light beam, which is beneficial to improving the imaging quality. In addition, in this industrial lens, the aperture STO is arranged in the optical system to limit the light beam size and control the amount of light passing through the lens, which is beneficial to reducing the aperture value and achieving a large aperture. The filter 111 can filter out stray light and improve the imaging effect.

[0065] Furthermore, the optical lens provided by embodiments of the present invention may further include a protective glass and an imaging sensor. The protective glass may be disposed on the image side of the filter, and the imaging sensor may be disposed on the image side of the protective glass. The protective glass protects the optical system, and the imaging sensor captures images, thereby enabling the optical system to function properly.

[0066] In summary, the industrial lens provided by the embodiment of the present invention is configured to have a focusing lens group that can float along the optical axis, thereby ensuring that focusing can be achieved at different working distances and clear imaging can be achieved at different working object distances. Furthermore, the fixed lens group is fixed, which can reduce the impact of focusing on different object distances on the resolution and ensure that the image quality at each working distance is balanced. In addition, by reasonably setting the number of lenses in the focusing lens group S1 and the fixed lens group S2, a lens design with a larger imaging range, smaller distortion, and higher clarity can be achieved, thereby ensuring the imaging quality of the industrial lens.

[0067] Based on the above embodiment, the first lens 101 is a positive power lens, the second lens 102 is a positive power lens, the third lens 103 is a positive power lens, the fourth lens 104 is a negative power lens, the fifth lens 105 is a positive power lens, the sixth lens 106 is a negative power lens, the seventh lens 107 is a negative power lens, the eighth lens 108 is a negative power lens, the ninth lens 109 is a positive power lens, and the tenth lens 110 is a positive power lens.

[0068] Specifically, the focal length is equal to the difference between the convergence of the image plane light beam and the convergence of the object plane light beam, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal length, the stronger the ability to bend light, and the smaller the absolute value of the focal length, the weaker the ability to bend light. When the focal length is a positive number, the refraction of light is convergent; when the focal length is a negative number, the refraction of light is divergent. The focal length can be applied to characterize a certain refractive surface of a lens (i.e., a surface of a lens), can be applied to characterize a certain lens, and can also be applied to characterize a system formed by multiple lenses (i.e., a lens group). In an embodiment of the present invention, the first lens 101, the second lens 102, and the third lens 103 are all positive focal length lenses, and the setting of their positive focal length can significantly correct the edge aberration of the optical imaging system, thereby improving the imaging resolution of the optical system. The fourth lens 104 is a negative focal length lens, and the setting of its negative focal length can effectively deflect the outgoing light, which is conducive to the design of a large image surface. The fifth lens 105 is a positive power lens, the sixth lens 106, the seventh lens 107 and the seventh lens 108 are all negative power lenses, and the ninth lens 109 and the tenth lens 110 are both positive power lenses. The combination of positive and negative power is conducive to correcting aberrations.

[0069] Based on the above embodiments, the focal length of the first lens 101 is F1, the focal length of the second lens 102 is F2, the focal length of the third lens 103 is F3, the focal length of the fourth lens 104 is F4, the focal length of the fifth lens 105 is F5, the focal length of the sixth lens 106 is F6, the focal length of the seventh lens 107 is F7, the focal length of the eighth lens 108 is F8, the focal length of the ninth lens 109 is F9, the focal length of the tenth lens 110 is F10, and the total focal length of the industrial lens is F; wherein, 1.921 < F1 / F < 2.292, 2.552 < F2 / F < 3.431, 1.010 < F3 / F < 1.798, -1.165 < F4 / F < -0.549, 0.359 < F5 / F < 0.494, -3.056

[0070] < F6 / F < -2.375, -0.868 < F7 / F < -0.645, -0.466 < F8 / F < -0.389, 0.761 < F9 / F < 0.917, 0.598 < F10 / F < 0.966. Reasonably allocating the focal lengths of the lenses while meeting the requirements of the above focal length relational expressions is beneficial to the normal convergence of light rays by the lens, reducing the height of light ray propagation inside the lens, minimizing the aberration generated by it, making the light ray trends and refraction angles on both sides of the object image consistent or close, and then by adjusting the air gaps between different lenses and optimizing the lens apertures, meeting the above relationships is beneficial to achieving the characteristics of small distortion, small chromatic aberration, and low field curvature.

[0071] Based on the above embodiments, the third lens 103 and the fourth lens 104 are adhesively bonded to form a first adhesively bonded lens group, and the fifth lens 105 and the sixth lens 106 are adhesively bonded to form a second adhesively bonded lens group.

[0072] Specifically, the adhesive bonding of different lenses can be understood as the image side of the previous lens in the optical path being fitted to the object side of the subsequent lens, having the same surface shape. As Figure 1 shown, the adhesive bonding of the third lens 103 and the fourth lens 104 can be understood as the image side of the third lens 103 being fitted to the object side of the fourth lens 104. The adhesive bonding of the fifth lens 105 and the sixth lens 106 can be understood as the image side of the fifth lens 105 being fitted to the object side of the sixth lens 106. That is, the focusing lens group S1 includes two pairs of adhesively bonded lens groups.

[0073] The adhesively bonded lens can be used to minimize or eliminate chromatic aberration. Using adhesively bonded lenses in industrial lenses can improve image quality and reduce the reflection loss of light energy, thereby enhancing the clarity of lens imaging. In addition, the adhesive bonding of the lenses omits the air gap between the two lenses, making the overall optical system compact and meeting the miniaturization requirements of the system. Moreover, the adhesive bonding of the lenses reduces the sensitivity of tolerance problems such as tilt / eccentricity generated during the assembly of the lens units.

[0074] Furthermore, the third lens 103 and the fourth lens 104 can be bonded together by glue; the fifth lens 105 and the sixth lens 106 can be bonded together by glue. The embodiment of the present invention does not limit the bonding method between different lenses.

[0075] Based on the above embodiment, the Abbe number of the third lens 103 is VD3, the Abbe number of the fourth lens 104 is VD4, the focal power of the third lens 103 is Φ3, the focal power of the fourth lens 104 is Φ4, and the focal power of the first cemented lens group is Φ3-4; wherein, 45.000 <VD3<58.873,

[0076] 38.803 <VD4<40.001,-0.536≤1000*(Φ3 / VD3+Φ4 / VD4)≤-0.332,10*|Φ3+Φ4-Φ3-4|<0.034。

[0077] Specifically, the Abbe number indicates the dispersion capability of a medium; a larger Abbe number indicates less dispersion. By properly setting the Abbe numbers of the third and fourth lenses 103 and 104, and ensuring that -0.536 ≤ 1000*(Φ3 / VD3+Φ4 / VD4) ≤ -0.332 and 10*|Φ3+Φ4-Φ3-4| < 0.034, axial and vertical chromatic aberrations are corrected, resulting in higher resolution and better performance.

[0078] Based on the above embodiment, the Abbe number of the fifth lens is VD5, the Abbe number of the sixth lens is VD6, the optical power of the fifth lens is Φ5, the optical power of the sixth lens is Φ6, and the optical power of the second cemented lens group is Φ5-6; wherein, 80.000 <VD5<92.968,14.997<VD6<25.866,

[0079] 0.052≤1000*(Φ5 / VD5+Φ6 / VD6)≤0.286, 10*|Φ5+Φ6-Φ5-6|<0.104. By properly setting the Abbe numbers of the fifth lens element 105 and the sixth lens element 106, and setting 0.052≤1000*(Φ5 / VD5+Φ6 / VD6)≤0.286, 10*|Φ5+Φ6-Φ5-6|<0.104, correction of axial and vertical chromatic aberration is facilitated, resulting in higher resolution and better performance.

[0080] Based on the above embodiment, the combined focal length of the first to seventh lenses is F1-7, and the combined focal length of the eighth to tenth lenses is F8-10; wherein, 1.100 <F1-7 / F8-10<1.373。

[0081] Specifically, the system distortion is the sum of the distortions generated by all lenses. The distortion is balanced by restricting the optical power of each lens. The combined focal length of the first lens to the seventh lens is denoted as F1-7, and the combined focal length of the eighth lens to the tenth lens is denoted as F8-10. Meeting the above conditions can balance the lens distortion.

[0082] Based on the above embodiments, the back focal length of the industrial lens is BFL, the overall optical length is TTL, and the total focal length is F. Among them, 0.240 < BFL / F < 0.254, and 0.522 < F / TTL < 0.552. Setting the back focal length BFL, the overall optical length TTL, and the total focal length F of the industrial lens to meet the above limitations is beneficial to compress the overall length of the lens and ensure the realization of a miniaturized lens design.

[0083] Based on the above embodiments, the first lens 101 includes a first object side surface close to the object surface side and a first image side surface close to the image surface side. The first object side surface is a convex surface, and the first image side surface is a concave surface; the second lens 102 includes a second object side surface close to the object surface side and a second image side surface close to the image surface side. The second object side surface is a convex surface, and the second image side surface is a concave surface; the third lens 103 includes a third object side surface close to the object surface side and a third image side surface close to the image surface side. The third object side surface is a convex surface, and the third image side surface is a concave surface; the fourth lens 104 includes a fourth object side surface close to the object surface side and a fourth image side surface close to the image surface side. The fourth object side surface is a convex surface, and the fourth image side surface is a concave surface; the fifth lens 105 includes a fifth object side surface close to the object surface side and a fifth image side surface close to the image surface side. The fifth object side surface is a convex surface, and the fifth image side surface is a convex surface; the sixth lens 106 includes a sixth object side surface close to the object surface side and a sixth image side surface close to the image surface side. The sixth object side surface is a concave surface, and the sixth image side surface is a convex surface; the seventh lens 107 includes a seventh object side surface close to the object surface side and a seventh image side surface close to the image surface side. The seventh object side surface is a convex surface, and the seventh image side surface is a concave surface; the eighth lens 108 includes an eighth object side surface close to the object surface side and an eighth image side surface close to the image surface side. The eighth object side surface is a concave surface, and the eighth image side surface is a concave surface; the ninth lens 109 includes a ninth object side surface close to the object surface side and a ninth image side surface close to the image surface side. The ninth object side surface is a concave surface, and the ninth image side surface is a convex surface; the tenth lens 110 includes a tenth object side surface close to the object surface side and a tenth image side surface close to the image surface side. The tenth object side surface is a convex surface, and the tenth image side surface is a concave surface.

[0084] Specifically, the object side surface of the lens can be understood as the surface of the lens close to the object surface side, and the image side surface of the lens can be understood as the surface of the lens close to the image surface side.

[0085] The object-side surface of the first lens 101 is convex, and the image-side surface is concave. It can be understood that the object-side surface of the first lens 101 is convex toward the object plane at a position near the optical axis, and the image-side surface is concave toward the image plane at a position near the optical axis, that is, the first lens 101 is a lens with a convex-concave structure.

[0086] The object-side surface of the second lens 102 is convex, and the image-side surface is concave. It can be understood that the object-side surface of the second lens 102 is convex toward the object plane at a position near the optical axis, and the image-side surface is concave toward the image plane at a position near the optical axis, that is, the second lens 102 is a lens with a convex-concave structure.

[0087] The object-side surface of the third lens 103 is convex, and the image-side surface is concave. It can be understood that the object-side surface of the third lens 103 is convex toward the object plane at a position near the optical axis, and the image-side surface is concave toward the image plane at a position near the optical axis, that is, the third lens 103 is a lens with a convex-concave structure.

[0088] The object-side surface of the fourth lens 104 is convex, and the image-side surface is concave. It can be understood that the object-side surface of the fourth lens 104 is convex toward the object plane at a position near the optical axis, and the image-side surface is concave toward the image plane at a position near the optical axis, that is, the fourth lens 104 is a lens with a convex-concave structure.

[0089] The object-side surface of the fifth lens 105 is convex, and the image-side surface is convex. It can be understood that the object-side surface of the fifth lens 105 is convex toward the object plane at a position near the optical axis, and the image-side surface is convex toward the image plane at a position near the optical axis, that is, the fifth lens 105 is a lens with a double convex structure.

[0090] The object-side surface of the sixth lens 106 is concave, and the image-side surface is convex. It can be understood that the object-side surface of the sixth lens 106 is concave toward the object plane at a position near the optical axis, and the image-side surface is convex toward the image plane at a position near the optical axis, that is, the sixth lens 106 can be a lens with a concave-convex structure.

[0091] The object-side surface of the seventh lens element 107 is convex, and the image-side surface is concave. It can be understood that the object-side surface of the seventh lens element 107 is convex toward the object plane at a position near the optical axis, and the image-side surface is concave toward the image plane at a position near the optical axis, that is, the seventh lens element 107 is a lens with a convex-concave structure.

[0092] The object-side surface and the image-side surface of the eighth lens element 108 are concave. It can be understood that the object-side surface of the eighth lens element 108 is concave toward the object plane at a position near the optical axis, and the image-side surface is concave toward the image plane at a position near the optical axis, that is, the eighth lens element 108 is a lens with a double concave structure.

[0093] The object-side surface of the ninth lens element 109 is concave, and the image-side surface is convex. It can be understood that the object-side surface of the ninth lens element 109 is concave toward the object plane at a position near the optical axis, and the image-side surface is convex toward the image plane at a position near the optical axis, that is, the ninth lens element 109 is a lens with a concave-convex structure.

[0094] The object-side surface of the tenth lens 110 is convex, and the image-side surface is concave. It can be understood that the object-side surface of the tenth lens 110 is convex toward the object plane at a position near the optical axis, and the image-side surface is concave toward the image plane at a position near the optical axis, that is, the tenth lens 110 is a lens with a convex-concave structure.

[0095] By reasonably setting the concave and convex surface shapes of each lens, it is possible to ensure that each lens modulates the light output angle. For a cemented lens, at least two adjacent lenses can be cemented together. On the other hand, the distance between adjacent lenses can be reduced, which is conducive to the realization of a small-volume industrial lens design.

[0096] Based on the above embodiment, the first lens 101 to the tenth lens 110 are all glass spherical lenses.

[0097] The characteristic of a spherical lens is that it has a constant curvature from the center of the lens to the periphery of the lens, which ensures that the lens is set up in a simple manner. Furthermore, since the thermal expansion coefficient of the lens made of glass material is small and the stability is good, the thermal properties of the glass spherical lens are more stable, which can ensure that the lens has good resolution in a wider temperature range when it bears more optical focal length. In addition, the range of glass materials available for selection is wider, and the refractive index and Abbe number can be relatively free to choose, which can control the high-order aberrations and chromatic aberrations of the lens to a certain extent, meeting the use requirements under complex conditions. Therefore, in the industrial lens provided by the embodiment of the present invention, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107, the eighth lens 108, the ninth lens 109 and the tenth lens 110 are all glass spherical lenses, which ensures that the performance of the industrial lens is stable, has good resolution in a wider temperature range, and meets the use requirements in high and low temperature environments.

[0098] As a feasible implementation method, the parameters of each lens in the industrial lens are described below.

[0099] Table 1 Optical design values ​​of the industrial lens in Example 1

[0100] Scope of protection Example 1 Lower limit Upper limit F1 / F 1.921 1.921 2.292 F2 / F 2.552 2.552 3.431 F3 / F 1.142 1.010 1.798 F4 / F -0.692 -1.165 -0.549 F5 / F 0.441 0.359 0.494 F6 / F -3.056 -3.056 -2.375 F7 / F -0.666 -0.868 -0.645 F8 / F -0.466 -0.466 -0.389 F9 / F 0.917 0.761 0.917 F10 / F 0.784 0.598 0.966 BEF / F 0.254 0.240 0.254 F / TTL 0.552 0.522 0.552 VD3 45.000 45.000 58.873 VD4 38.669 33.803 40.001 VD5 92.968 80.000 92.968 VD6 14.997 14.997 25.866 1000*(Φ3 / VD3+Φ4 / VD4) -0.359 -0.536 -0.332 1000*(Φ5 / VD5+Φ6 / VD6) 0.052 0.052 0.286 10*|Φ3+Φ4-Φ3-4| 0.026 0.010 0.034 10*|Φ5+Φ6-Φ5-6| 0.071 0.054 0.104 F1-7 / F8-10 1.100 1.100 1.373

[0101] Table 2 Design values ​​of optical physical parameters of industrial lenses

[0102]

[0103] The surface numbers in Table 2 are numbered according to the order of the lens surfaces. "0" represents the object surface, "1" represents the object-side surface of the first lens, "2" represents the image-side surface of the first lens, and so on. The radius of curvature represents the degree of curvature of the corresponding lens surface. A positive value indicates that the surface is curved toward the image plane, and a negative value indicates that the surface is curved toward the object plane. "INF" indicates that the surface is flat and has an infinite radius of curvature. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the light-bending ability of the material between the current and next surfaces. A blank space represents the current position as air with a refractive index of 1. The Abbe number represents the light-dispersion properties of the material between the current and next surfaces. The semi-aperture represents half the aperture size of the current surface.

[0104] Table 3 A design value of focus interval

[0105] Object distance Object distance 100mm Object distance 300mm Object distance is infinite Focus interval 11.845 3.788 0.090

[0106] This embodiment meets the following parameters:

[0107] Focal length: 49.953mm; image side f-number: 2.816; image plane Φ11.82mm.

[0108] Figure 2 This is a schematic diagram of the light fan of an industrial lens at the optimal object distance provided by Example 1 of the present invention. The light fan diagram is one of the most commonly used evaluation methods in modern optical design. The horizontal axis is the beam aperture, and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane, and the corresponding interval on the vertical axis of the curve is the maximum diffusion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. By Figure 2 It can be seen that the system's wavelengths in each field of view are all well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the system's chromatic aberration is also well corrected, thereby ensuring that the optical system can achieve high-resolution imaging requirements.

[0109] Figure 3 : This is a schematic diagram of the field curvature distortion curve of an industrial lens at the optimal object distance provided by the first embodiment of the present invention. In the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, S represents the sagittal; Figure 3 It can be seen that the field curvature of the lens provided by this embodiment is effectively controlled, that is, when imaging, the difference in image quality between the center and the periphery is small, and the consistency is good. In the coordinate system on the right, the horizontal coordinate represents the degree of distortion, in %, and the vertical coordinate represents the normalized image height, without unit. Figure 3It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the optical distortion is less than ±0.3%.

[0110] Figure 4 This is a schematic diagram of the MTF curve of an industrial lens provided in Example 1 of the present invention at the optimal object distance. The image quality of the lens of the present invention at 250pl / mm from the center field of view to the edge field of view is higher than 0.2MTF, and the imaging has excellent resolution.

[0111] Figure 5 This is a schematic diagram of the axial chromatic aberration curve for an industrial lens at optimal object distance, provided by Example 1 of the present invention. The vertical axis represents the normalized zero-field-of-view pupil plane, with 0 representing the pupil center and the vertical vertex representing the pupil apex. The horizontal axis shows the axial chromatic aberration at different wavelengths (specifically, 460nm, 530nm, and 620nm), measured in millimeters (mm). As shown in the figure, the axial chromatic aberration of the lens of this invention is less than 25μm across the entire pupil, resulting in excellent image clarity.

[0112] Figure 6 This is a schematic diagram of the vertical chromatic aberration curve for an industrial lens at optimal object distance, provided by Example 1 of the present invention. The vertical axis in the figure represents the field of view angle, with 0 representing the field of view angle for incident light parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. As shown in the figure, the vertical chromatic aberration from the center to the edge of the lens field of view is less than 0.5μm at all wavelengths of the system (specifically, 460nm, 530nm, and 620nm), resulting in higher image quality.

[0113] In summary, the industrial lens provided by the embodiments of the present invention adopts an all-glass 10G structure. By matching lens materials and rationally allocating the optical power of each component, an industrial lens design that can balance wide object distance, high resolution, and low optical distortion is achieved. It can achieve focusing from an object distance of 100mm to infinity, a focal length of 49.953mm, an image-side F-number of 2.816, a target surface of Φ11.82mm, and optical distortion ≤0.3%.

[0114] Example 2

[0115] Figure 7 FIG. 1 is a structural diagram of an industrial lens provided by the second embodiment of the present invention at an optimal object distance. Figure 7As shown, the industrial lens provided by the second embodiment of the present invention includes a focusing lens group S1 and a fixed lens group S2 arranged in sequence along the optical axis from the object plane to the image plane. The position of the focusing lens group S1 can float along the optical axis, and the position of the fixed lens group S2 is fixed; the focusing lens group S1 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105 and a sixth lens 106 arranged in sequence along the optical axis from the object plane to the image plane; the fixed lens group S2 includes a seventh lens 107, an eighth lens 108, a ninth lens 109 and a tenth lens 110 arranged in sequence along the optical axis from the object plane to the image plane.

[0116] Other parameters are the same as those in the first embodiment and will not be described again here.

[0117] As another feasible implementation, specific parameters of the industrial lens are described below.

[0118] Table 4 Optical design values ​​of the industrial lens in Example 2

[0119] Scope of protection Example 2 Lower limit Upper limit F1 / F 2.292 1.921 2.292 F2 / F 2.864 2.552 3.431 F3 / F 1.010 1.010 1.798 F4 / F -0.549 -1.165 -0.549 F5 / F 0.359 0.359 0.494 F6 / F -2.375 -3.056 -2.375 F7 / F -0.645 -0.868 -0.645 F8 / F -0.389 -0.466 -0.389 F9 / F 0.761 0.761 0.917 F10 / F 0.598 0.598 0.966 BEF / F 0.240 0.240 0.254 F / TTL 0.5227 0.522 0.552 VD3 50.000 45.000 58.873 VD4 40.001 33.803 40.001 VD5 80.000 80.000 92.968 VD6 19.998 14.997 25.866 1000*(Φ3 / VD3+Φ4 / VD4) -0.536 -0.536 -0.332 1000*(Φ5 / VD5+Φ6 / VD6) 0.286 0.052 0.286 10*|Φ3+Φ4-Φ3-4| 0.034 0.010 0.034 10*|Φ5+Φ6-Φ5-6| 0.104 0.054 0.104 F1-7 / F8-10 1.373 1.100 1.373

[0120] Table 5 Design values ​​of optical physical parameters of industrial lenses

[0121]

[0122] The surface numbers in Table 5 are numbered according to the order of the lens surfaces. "0" represents the object surface, "1" represents the object-side surface of the first lens, "2" represents the image-side surface of the first lens, and so on. The radius of curvature represents the degree of curvature of the corresponding lens surface. A positive value indicates that the surface is curved toward the image plane, while a negative value indicates that the surface is curved toward the object plane. "INF" indicates that the surface is flat and has an infinite radius of curvature. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the light-bending ability of the material between the current and next surfaces. A blank space represents the current position as air with a refractive index of 1. The Abbe number represents the light-dispersion properties of the material between the current and next surfaces. The semi-aperture represents half the aperture size of the current surface.

[0123] Table 6 A design value of focus interval

[0124] Object distance Object distance 100mm Object distance 300mm Object distance is infinite Focus interval 11.717 3.777 0.098

[0125] This embodiment meets the following parameters:

[0126] Focal length: 47.997mm; image side f-number: 2.898; image plane Φ11.816mm.

[0127] Figure 8This is a schematic diagram of the light fan of an industrial lens at the optimal object distance provided by Example 2 of the present invention. The light fan diagram is one of the most commonly used evaluation methods in modern optical design. The horizontal axis is the beam diameter, and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane, and the corresponding interval on the vertical axis of the curve is the maximum diffusion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. By Figure 8 It can be seen that the system's wavelengths in each field of view are all well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the system's chromatic aberration is also well corrected, thereby ensuring that the optical system can achieve high-resolution imaging requirements.

[0128] Figure 9 : This is a schematic diagram of the field curvature distortion curve of an industrial lens at the optimal object distance provided by the second embodiment of the present invention. In the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, and S represents the sagittal; Figure 9 It can be seen that the field curvature of the lens provided by this embodiment is effectively controlled, that is, when imaging, the difference in image quality between the center and the periphery is small, and the consistency is good. In the coordinate system on the right, the horizontal coordinate represents the degree of distortion, in %, and the vertical coordinate represents the normalized image height, without unit. Figure 9 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the optical distortion is less than ±0.3%.

[0129] Figure 10 This is a schematic diagram of the MTF curve of an industrial lens provided in Example 2 of the present invention at the optimal object distance. The image quality of the lens of the present invention at 250pl / mm from the center field of view to the edge field of view is higher than 0.2MTF, and the imaging has excellent resolution.

[0130] Figure 11 This is a schematic diagram of the axial chromatic aberration curve for an industrial lens at optimal object distance, provided by Example 2 of the present invention. The vertical axis represents the normalized zero-field-of-view pupil plane, with 0 representing the pupil center and the vertical vertex representing the pupil apex. The horizontal axis shows the axial chromatic aberration at different wavelengths (specifically, 460nm, 530nm, and 620nm), measured in millimeters (mm). As shown in the figure, the axial chromatic aberration of the lens of this invention is less than 25μm across the entire pupil, resulting in excellent image clarity.

[0131] Figure 12This is a schematic diagram of the vertical chromatic aberration curve for an industrial lens at optimal object distance, provided by Example 2 of the present invention. The vertical axis in the figure represents the field of view angle, with 0 representing the field of view angle for incident light parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. As shown in the figure, the vertical chromatic aberration from the center to the edge of the lens field of view is less than 0.5μm at all wavelengths of the system (specifically 460nm, 530nm, and 620nm), resulting in higher image quality.

[0132] In summary, the industrial lens provided by the embodiments of the present invention adopts an all-glass 10G structure. By matching lens materials and rationally allocating the optical power of each component, an industrial lens design that can balance wide object distance, high resolution, and low optical distortion is achieved. It can achieve focusing from an object distance of 100mm to infinity, a focal length of 47.997mm, an image-side F-number of 2.898, a target surface of Φ11.816mm, and optical distortion ≤0.3%.

[0133] Example 3

[0134] Figure 13 FIG. 1 is a schematic structural diagram of an industrial lens provided by the third embodiment of the present invention at an optimal object distance. Figure 13 As shown, the industrial lens provided in the third embodiment of the present invention includes a focusing lens group S1 and a fixed lens group S2 arranged in sequence along the optical axis from the object plane to the image plane. The position of the focusing lens group S1 can float along the optical axis, and the position of the fixed lens group S2 is fixed; the focusing lens group S1 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105 and a sixth lens 106 arranged in sequence along the optical axis from the object plane to the image plane; the fixed lens group S2 includes a seventh lens 107, an eighth lens 108, a ninth lens 109 and a tenth lens 110 arranged in sequence along the optical axis from the object plane to the image plane.

[0135] Other parameters are the same as those in the first embodiment and will not be described again here.

[0136] As another feasible implementation, specific parameters of the industrial lens are described below.

[0137] Table 7 Optical design values ​​of the industrial lens in Example 3

[0138] Scope of protection Example 3 Lower limit Upper limit F1 / F 1.967 1.921 2.292 F2 / F 3.431 2.552 3.431 F3 / F 1.798 1.010 1.798 F4 / F -1.165 -1.165 -0.549 F5 / F 0.494 0.359 0.494 F6 / F -2.584 -3.056 -2.375 F7 / F -0.868 -0.868 -0.645 F8 / F -0.465 -0.466 -0.389 F9 / F 0.798 0.761 0.917 F10 / F 0.966 0.598 0.966 BEF / F 0.249 0.240 0.254 F / TTL 0.522 0.522 0.552 VD3 58.873 45.000 58.873 VD4 33.803 33.803 40.001 VD5 87.927 80.000 92.968 VD6 25.866 14.997 25.866 1000*(Φ3 / VD3+Φ4 / VD4) -0.332 -0.536 -0.332 1000*(Φ5 / VD5+Φ6 / VD6) 0.168 0.052 0.286 10*|Φ3+Φ4-Φ3-4| 0.010 0.010 0.034 10*|Φ5+Φ6-Φ5-6| 0.054 0.054 0.104 F1-7 / F8-10 1.194 1.100 1.373

[0139] Table 8 Design values ​​of optical physical parameters of industrial lenses

[0140]

[0141] The surface numbers in Table 8 are numbered according to the order of the lens surfaces. "0" represents the object surface, "1" represents the object-side surface of the first lens, "2" represents the image-side surface of the first lens, and so on. The radius of curvature represents the degree of curvature of the corresponding lens surface. A positive value indicates that the surface is curved toward the image plane, while a negative value indicates that the surface is curved toward the object plane. "INF" indicates that the surface is flat and has an infinite radius of curvature. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the light-bending ability of the material between the current and next surfaces. A blank space represents the current position as air with a refractive index of 1. The Abbe number represents the light-dispersion properties of the material between the current and next surfaces. The semi-aperture represents half the aperture size of the current surface.

[0142] Table 9 A design value of focus interval

[0143] Object distance Object distance 100mm Object distance 300mm Object distance is infinite Focus interval 12.560 4.016 0.096

[0144] This embodiment meets the following parameters:

[0145] Focal length: 47.998mm; image side f-number: 2.804; image plane Φ11.814mm.

[0146] Figure 14 This is a schematic diagram of the light fan of an industrial lens at the optimal object distance provided by Example 3 of the present invention. The light fan diagram is one of the most commonly used evaluation methods in modern optical design. The horizontal axis is the beam diameter, and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane, and the corresponding interval on the vertical axis of the curve is the maximum diffusion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. By Figure 14 It can be seen that the system's wavelengths in each field of view are all well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the system's chromatic aberration is also well corrected, thereby ensuring that the optical system can achieve high-resolution imaging requirements.

[0147] Figure 15 : This is a schematic diagram of a field curvature distortion curve of an industrial lens at an optimal object distance provided by Example 3 of the present invention. In the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, without a unit; T represents the meridian, S represents the sagittal; Figure 15 It can be seen that the field curvature of the lens provided by this embodiment is effectively controlled, that is, when imaging, the difference in image quality between the center and the periphery is small, and the consistency is good. In the coordinate system on the right, the horizontal coordinate represents the degree of distortion, in %, and the vertical coordinate represents the normalized image height, without unit. Figure 9It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the optical distortion is less than ±0.3%.

[0148] Figure 16 This is a schematic diagram of the MTF curve of an industrial lens provided in Example 3 of the present invention at the optimal object distance. The image quality of the lens of the present invention at 250pl / mm from the center field of view to the edge field of view is higher than 0.2MTF, and the imaging has excellent resolution.

[0149] Figure 17 This is a schematic diagram of the axial chromatic aberration curve for an industrial lens at optimal object distance, provided by Example 3 of the present invention. The vertical axis represents the normalized zero-field-of-view pupil plane, with 0 representing the pupil center and the vertical vertex representing the pupil apex. The horizontal axis shows the axial chromatic aberration at different wavelengths (specifically, 460nm, 530nm, and 620nm), measured in millimeters (mm). As shown in the figure, the axial chromatic aberration of the lens of this invention is less than 25μm across the entire pupil, resulting in excellent image clarity.

[0150] Figure 18 This is a schematic diagram of the vertical chromatic aberration curve for an industrial lens at optimal object distance, provided by Example 3 of the present invention. The vertical axis in the figure represents the field of view angle, with 0 representing the field of view angle for incident light parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. As shown in the figure, the vertical chromatic aberration from the center to the edge of the lens field of view is less than 0.5μm at all wavelengths of the system (specifically 460nm, 530nm, and 620nm), resulting in higher image quality.

[0151] In summary, the industrial lens provided by the embodiments of the present invention adopts an all-glass 10G structure. By matching lens materials and rationally allocating the optical power of each component, an industrial lens design that can balance wide object distance, high resolution, and low optical distortion is achieved. It can achieve focusing from an object distance of 100mm to infinity, a focal length of 47.998mm, an image-side F-number of 2.804, a target surface of Φ11.814mm, and optical distortion ≤0.3%.

[0152] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An industrial lens, characterized in that: The optical system comprises a focus lens group, an aperture and a fixed lens group arranged in sequence along the optical axis from the object plane to the image plane, wherein the position of the focus lens group can float along the optical axis, and the position of the fixed lens group is fixed; The focusing lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object plane to the image plane along the optical axis; The fixed lens group includes a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the optical axis from the object plane to the image plane.

2. The industrial lens according to claim 1, characterized in that: The first lens is a positive power lens, the second lens is a positive power lens, the third lens is a positive power lens, the fourth lens is a negative power lens, the fifth lens is a positive power lens, the sixth lens is a negative power lens, the seventh lens is a negative power lens, the eighth lens is a negative power lens, the ninth lens is a positive power lens, and the tenth lens is a positive power lens.

3. The industrial lens according to claim 1, characterized in that: The focal length of the first lens is F1, the focal length of the second lens is F2, the focal length of the third lens is F3, the focal length of the fourth lens is F4, the focal length of the fifth lens is F5, the focal length of the sixth lens is F6, the focal length of the seventh lens is F7, the focal length of the eighth lens is F8, the focal length of the ninth lens is F9, the focal length of the tenth lens is F10, and the total focal length of the industrial lens is F; Among them, 1.921 <F1 / F<2.292,2.552<F2 / F<3.431,1.010<F3 / F<1.798,-1.165<F4 / F<-0.549,0.359<F5 / F<0.494,-3.056<F6 / F<-2.375, -0.868 <F7 / F<-0.645,-0.466<F8 / F<-0.389,0.761<F9 / F<0.917, 0.598 <F10 / F<0.966。 4. The industrial lens according to claim 1, characterized in that: The third lens and the fourth lens are cemented together to form a first cemented lens group, and the fifth lens and the sixth lens are cemented together to form a second cemented lens group.

5. The industrial lens according to claim 4, characterized in that: The Abbe number of the third lens is VD3, the Abbe number of the fourth lens is VD4, the focal power of the third lens is Φ3, the focal power of the fourth lens is Φ4, and the focal power of the first cemented lens group is Φ3-4; Of these, 45,000 <VD3<58.873,38.803<VD4<40.001, -0.536≤1000*(Φ3 / VD3+Φ4 / VD4)≤-0.332, 10*|Φ3+Φ4-Φ3-4|<0.

034.

6. The industrial lens according to claim 4, characterized in that: The Abbe number of the fifth lens is VD5, the Abbe number of the sixth lens is VD6, the focal power of the fifth lens is Φ5, the focal power of the sixth lens is Φ6, and the focal power of the second cemented lens group is Φ5-6; Of these, 80,000 <VD5<92.968,14.997<VD6<25.866, 0.052≤1000*(Φ5 / VD5+Φ6 / VD6)≤0.286, 10*|Φ5+Φ6-Φ5-6|<0.

104.

7. The industrial lens according to claim 1, characterized in that: The combined focal length of the first to seventh lenses is F1-7, and the combined focal length of the eighth to tenth lenses is F8-10; Among them, 1.100 <F1-7 / F8-10<1.373。 8. The industrial lens according to claim 1, characterized in that: The back focal length of the industrial lens is BFL, the total optical length is TTL, and the total focal length is F; Among them, 0.240 <BFL / F<0.254,0.522<F / TTL<0.552。 9. The industrial lens according to claim 1, characterized in that: The first lens includes a first object-side surface close to the object plane and a first image-side surface close to the image plane, the first object-side surface is convex, and the first image-side surface is concave; The second lens includes a second object-side surface close to the object plane and a second image-side surface close to the image plane, the second object-side surface is convex, and the second image-side surface is concave; The third lens comprises a third object-side surface close to the object plane and a third image-side surface close to the image plane, the third object-side surface is convex, and the third image-side surface is concave; The fourth lens comprises a fourth object-side surface close to the object plane and a fourth image-side surface close to the image plane, the fourth object-side surface is convex, and the fourth image-side surface is concave; The fifth lens comprises a fifth object-side surface close to the object plane and a fifth image-side surface close to the image plane, the fifth object-side surface is a convex surface, and the fifth image-side surface is a convex surface; The sixth lens comprises a sixth object-side surface close to the object plane and a sixth image-side surface close to the image plane, the sixth object-side surface is concave, and the sixth image-side surface is convex; The seventh lens element includes a seventh object-side surface close to the object plane and a seventh image-side surface close to the image plane, the seventh object-side surface is convex, and the seventh image-side surface is concave; The eighth lens comprises an eighth object-side surface close to the object plane and an eighth image-side surface close to the image plane, the eighth object-side surface is concave, and the eighth image-side surface is concave; The ninth lens comprises a ninth object-side surface close to the object plane and a ninth image-side surface close to the image plane, wherein the ninth object-side surface is concave and the ninth image-side surface is convex. The tenth lens includes a tenth object-side surface close to the object plane and a tenth image-side surface close to the image plane. The tenth object-side surface is a convex surface, and the tenth image-side surface is a concave surface.

10. The industrial lens according to claim 1, characterized in that: The first lens to the tenth lens are all glass spherical lenses.

Images