Industrial camera and lens thereof

Abstract

The invention discloses an industrial camera and a lens thereof, and the lens comprises a front optical assembly which is used for compressing the incident angle of an off-axis view field; the middle optical component is at least used for correcting lens distortion; the rear optical assembly is used for compressing an incident angle incident to the image surface; wherein the value range of the working distance of the lens is 140 mm to 270 mm; the value range of the aperture is F2.4 to F3.6; the full-view distortion of the lens is less than 0.25%. The industrial camera and the lens thereof have the beneficial effect that the industrial camera and the lens thereof which can effectively meet the high-resolution requirement are provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial cameras, in particular to an industrial camera and a lens thereof. BACKGROUND

[0002] A 3D industrial camera is a non-contact optical imaging device specially used in the industrial field, which can obtain three-dimensional information (such as shape, size, depth and position) of an object.

[0003] Generally, a 3D industrial camera is realized by laser triangulation, an imaging system collects images of a measured part and a laser line projected thereon, and then analyzes and calculates the images to obtain the required size data.

[0004] With the development of 3D industrial cameras, especially when applied to some high-resolution detection scenes, the requirements for the lenses of 3D industrial cameras are getting higher and higher.

[0005] Currently, there is no lens that can effectively support high resolution. SUMMARY

[0006] The summary part of the present application is used to introduce the concepts in a brief form, which will be described in detail in the specific embodiment part. The summary part of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0007] Some embodiments of the present application propose a lens suitable for an industrial camera to solve the technical problems mentioned in the background part.

[0008] As a first aspect of the present application, some embodiments of the present application provide a lens suitable for an industrial camera, comprising: a front optical assembly for compressing the incident angle of an off-axis field of view; a middle optical assembly for at least correcting lens distortion; and a rear optical assembly for compressing the incident angle of an image surface; wherein the working distance of the lens is in the range of 140mm to 270mm; the aperture value is in the range of F2.4 to F3.6; and the total field of view optical distortion of the lens is less than 0.25%.

[0009] Optionally, in some embodiments of the present application, the front optical assembly comprises: a first optical element configured as a negative meniscus lens; wherein the focal length of the first optical element ranges from -50mm to -90mm; the curvature radius of the first optical element ranges from 36mm

[0010] Optionally, in some embodiments of the present application, the middle optical assembly comprises: a second optical element configured as a positive plano-convex lens; wherein the focal length of the second optical element ranges from 40mm to 80mm; the curvature radius of the second optical element ranges from 23mm

[0011] Optionally, in some embodiments of the present application, the middle optical assembly comprises: a third optical element configured as a positive meniscus lens; wherein the focal length of the third optical element ranges from 20mm to 50mm; the curvature radius of the third optical element ranges from 23mm

[0012] Optionally, in some embodiments of the present application, the middle optical assembly comprises: a fourth optical element configured as a negative meniscus lens; wherein the focal length of the fourth optical element ranges from -16mm to -45mm; the curvature radius of the fourth optical element ranges from 13mm

[0013] Optionally, in some embodiments of the present application, the middle optical assembly comprises: a fifth optical element configured as a negative meniscus lens; wherein the focal length of the fifth optical element ranges from -12 mm to -25 mm; the curvature radius of the fifth optical element ranges from -21 mm < c1 < -7 mm, -32 mm < c2 < -21 mm; the thickness of the fifth optical element ranges from 0.5 mm to 1.5 mm; the diameter of the fifth optical element ranges from 12 mm to 16 mm; the refractive index of the fifth optical element ranges from 1.71 to 1.76; and the Abbe number of the fifth optical element ranges from 24 to 36.

[0014] Optionally, in some embodiments of the present application, the middle optical assembly comprises: a sixth optical element configured as a positive meniscus lens; wherein the focal length of the sixth optical element ranges from 21 mm to 40 mm; the curvature radius of the sixth optical element ranges from -35 mm < c1 < -21 mm, -9 mm < c2 < -19 mm; the thickness of the sixth optical element ranges from 3 mm to 4 mm; the diameter of the sixth optical element ranges from 17 mm to 21 mm; the refractive index of the sixth optical element ranges from 1.75 to 1.86; and the Abbe number of the sixth optical element ranges from 36 to 48.

[0015] Optionally, in some embodiments of the present application, the middle optical assembly comprises: a seventh optical element configured as a negative meniscus lens; wherein the focal length of the seventh optical element ranges from 36 mm to 55 mm; the curvature radius of the seventh optical element ranges from -96 mm < c1 < 70 mm, -42 mm < c2 < -22 mm; the thickness of the seventh optical element ranges from 2 mm to 3.6 mm; the diameter of the seventh optical element ranges from 22 mm to 24 mm; the refractive index of the seventh optical element ranges from 1.80 to 1.92; and the Abbe number of the seventh optical element ranges from 42 to 53.

[0016] Optionally, in some embodiments of the present application, the middle optical assembly comprises: an eighth optical element configured as a negative meniscus lens; wherein the focal length of the eighth optical element ranges from 40 mm to 65 mm; the curvature radius of the eighth optical element ranges from 35 mm < c1 < 56 mm, -420 mm < c2 < -320 mm; the thickness of the eighth optical element ranges from 2 mm to 3.6 mm; the diameter of the eighth optical element ranges from 24 mm to 28 mm; the refractive index of the eighth optical element ranges from 1.71 to 1.82; and the Abbe number of the eighth optical element ranges from 49 to 56.

[0017] Optionally, in some embodiments of the present application, the first optical element, the second optical element, the third optical element, the fourth optical element, the fifth optical element, the sixth optical element, the seventh optical element and the eighth optical element are sequentially arranged.

[0018] As a first aspect of the present application, some embodiments of the present application provide an industrial camera comprising the lens described above.

[0019] Optionally, in some embodiments of the present application, the industrial camera is a 3D industrial camera.

[0020] The present application has the beneficial effect of providing an industrial camera and a lens thereof capable of effectively meeting high resolution requirements. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and to make apparent the other features, objectives and advantages of the present application. The illustrative embodiments of the drawings and their descriptions serve the purpose of explaining the present application, and do not constitute an undue limitation on the present application.

[0022] In addition, throughout the drawings, identical or similar reference numerals designate identical or similar elements. It should be understood that the drawings are schematic, and elements and elements are not necessarily drawn to scale.

[0023] In the drawings: Figure 1 is a schematic diagram of a lens according to an embodiment of the present application when imaging; Figure 2 is Figure 1 is a schematic diagram of the light path of the lens shown when imaging; Figure 3 is a schematic diagram of the lens structure according to an embodiment of the present application; Figure 4 is a distortion curve of different light rays of the lens according to an embodiment of the present application; Figure 5 is Figure 1 is a schematic diagram of the object plane from the perspective of A; Figure 6 is an industrial camera according to an embodiment of the present application.

[0024] Meaning of reference numerals: 1. Industrial camera; 2. Object plane; 100. Window lens; 200. Lens; 210. Front optical assembly; 220. Middle optical assembly; 230, rear optical assembly; 201, first optical element; 202, second optical element; 203, third optical element; 204, fourth optical element; 205, fifth optical element; 206, sixth optical element; 207, seventh optical element; 208, eighth optical element; 300, imaging sensor; 400, aperture stop. DETAILED DESCRIPTION

[0025] Embodiments of the present disclosure will be described in detail below with reference to the drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms, and should not be interpreted as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes, and are not intended to limit the scope of protection of the present disclosure.

[0026] In addition, it should be further noted that only parts related to the present application are shown in the drawings for ease of description. The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0027] It should be noted that the terms "first", "second", and the like mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0028] It should be noted that the terms "one", "multiple" mentioned in the present disclosure are illustrative and not restrictive, and those skilled in the art should understand that unless otherwise explicitly stated in the context, it should be understood as "one or more".

[0029] The names of the messages or information exchanged between the devices in the embodiments of the present disclosure are only for illustrative purposes, and are not intended to limit the scope of the messages or information.

[0030] The present disclosure will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] Referring to Figures 1 to 3 As shown in the drawings, the lens 200 of the present application mainly includes a front optical assembly 210, a middle optical assembly 220 and a rear optical assembly 230.

[0032] The front optical assembly 210 is used to compress the incident angle of the out-of-axis field of view; the middle optical assembly 220 is used to correct at least the distortion of the lens 200; and the rear optical assembly 230 is used to compress the incident angle of the incident to the image plane.

[0033] The working distance of the lens 200 is in the range of 140mm to 270mm; the aperture is in the range of F2.4 to F3.6; and the total field distortion of the lens 200 is less than 0.25%.

[0034] Referring to FIGS. 1 to 3, Figure 1 and Figure 5 As shown in FIGS. 1 to 3, the Schmitt lens 200 is used for a traditional imaging lens 200, in order to ensure that the objects in a certain working range can be clearly imaged on the image plane; when the object plane 2 is tilted at a certain angle, the image plane is also tilted at a certain angle, so that the image formed by the object plane 2 can be clearly imaged, the length of the object plane 2 that can be imaged is defined as the working distance L; the tilt angle of the object plane 2 is defined as the object-side included angle α; the MR (Measurement range) range (detection range) of the lens 200 of the present application is marked as MR, and MR=L / COS α.

[0035] The field of view of the Schmitt lens is a trapezoidal field of view, and the end close to the camera is called the near end and the end far away is called the far end in the industry. The Schmitt lens is used for a traditional imaging lens, to ensure that the objects in a certain working range can be clearly imaged on the image plane; when the object plane is tilted at a certain angle, the image plane is also tilted at a certain angle, so that the image formed by the object plane can be clearly imaged.

[0036] The object-side included angle α of the lens 200 of the present application is in the range of 20° to 30°; the near-end field of view width W1 of the lens 200 of the present application is in the range of 130mm to 141mm; the far-end field of view width W2 of the lens 200 of the present application is in the range of 207mm to 236mm; and the MR (Measurement range) range (detection range) of the lens 200 of the present application is in the range of 57mm to 85mm.

[0037] More specifically, the light wavelength adapted by the lens 200 of the present application is in the range of 400nm to 460nm; the target surface diameter size adapted by the lens 200 of the present application is in the range of 25mm to 30mm, preferably 26.5mm; the magnification of the lens 200 of the present application is in the range of 0.1 to 0.19; the total length of the lens 200 of the present application is less than or equal to 37mm; and the lens 200 of the present application can be constructed as a Schmitt lens 200.

[0038] As an optional solution, the focal length of the lens 200 of the present application is in the range of 25mm to 30mm; and the lens type of the lens 200 of the present application is a spherical surface.

[0039] The spherical design can adopt a large aperture and low distortion design as much as possible under the premise of ensuring accuracy. The lens 200 of the present application can be adapted to a CMOS sensor; the lens 200 of the present application reasonably allocates the refractive power of the lens, and as much as possible reduces the primary aberration and high-order aberration to achieve a large aperture, low distortion, large target surface, and small size design.

[0040] From the perspective of material, the optical elements in the lens 200 of the present application can be made of lanthanum crown glass (model: H-LAK), heavy crown glass (H-ZK), lanthanum flint glass (H-LA) and other series of materials produced by Chengdu Guangming Optoelectronics Co., Ltd.

[0041] Referring to Figures 1 to 3 The lens 200 of the present application includes eight optical elements (optical lenses), each of which corrects different aberrations in the optical path.

[0042] Referring to Figures 1 to 3 In some embodiments of the present application, the front lens 200 assembly includes: a first optical element 201, the first optical element 201 is configured as a negative meniscus lens; wherein the focal length of the first optical element 201 is in the range of -50mm to -90mm; the curvature radius of the first optical element 201 is in the range of 36mm

[0043] As a specific example, the focal length of the first optical element 201 is -86mm; the curvature radius of the first optical element 201 is c1=38.3mm, c2=21.5mm; the thickness of the first optical element 201 is 1mm; the diameter of the first optical element 201 is 28.6mm; the refractive index of the first optical element 201 is 1.57; and the Abbe number of the first optical element 201 is 56.

[0044] Referring to Figures 1 to 3As shown in some embodiments of the present application, the middle lens 200 assembly comprises: a second optical element 202, which is configured as a positive plano-convex lens; wherein the focal length of the second optical element 202 is in the range of 40mm to 80mm; the curvature radius of the second optical element 202 is in the range of 23mm<c1<45mm, 100mm<c2<180mm; the thickness of the second optical element 202 is in the range of 2.3mm to 3.2mm; the diameter of the second optical element 202 is in the range of 22mm to 26mm; the refractive index of the second optical element 202 is in the range of 1.59 to 1.71; and the Abbe number of the second optical element 202 is in the range of 42 to 59.

[0045] As a specific example, the focal length of the second optical element 202 is 55.9mm; the curvature radius of the second optical element 202 is c1=30mm, c2=191.4mm; the thickness of the second optical element 202 is 2.6mm; the diameter of the second optical element 202 is 25mm; the refractive index of the second optical element 202 is 1.62; and the Abbe number of the second optical element 202 is 60.3.

[0046] Referring to Figures 1 to 3 As shown in some embodiments of the present application, the middle lens 200 assembly comprises: a third optical element 203, which is configured as a positive meniscus lens; wherein the focal length of the third optical element 203 is in the range of 20mm to 50mm; the curvature radius of the third optical element 203 is in the range of 23mm<c1<45mm, 100mm<c2<180mm; the thickness of the third optical element 203 is in the range of 2.3mm to 3.2mm; the diameter of the third optical element 203 is in the range of 16mm to 22mm; the refractive index of the third optical element 203 is in the range of 1.69 to 1.78; and the Abbe number of the third optical element 203 is in the range of 50 to 55.

[0047] As a specific example, the focal length of the third optical element 203 is 25.37mm; the curvature radius of the third optical element 203 is c1=13.0mm, c2=33.9mm; the thickness of the third optical element 203 is 3.9mm; the diameter of the third optical element 203 is 20.4mm; the refractive index of the third optical element 203 is 1.76; and the Abbe number of the third optical element 203 is 52.3.

[0048] Referring to Figures 1 to 3As shown in some embodiments of the present application, the middle lens 200 assembly comprises: a fourth optical element 204, which is configured as a negative meniscus lens; wherein the focal length of the fourth optical element 204 ranges from -16 mm to -45 mm; the curvature radius of the fourth optical element 204 ranges from 13 mm < c1 < 22 mm, 5 mm < c2 < 13 mm; the thickness of the fourth optical element 204 ranges from 1.2 mm to 2.2 mm; the diameter of the fourth optical element 204 ranges from 12 mm to 14 mm; the refractive index of the fourth optical element 204 ranges from 1.71 to 1.76; and the Abbe number of the fourth optical element 204 ranges from 24 to 36.

[0049] As a specific example, the focal length of the fourth optical element 204 is -28.3 mm; the curvature radius of the fourth optical element 204 is c1 = 16.9 mm, c2 = 8.9 mm; the thickness of the fourth optical element 204 is 1.65 mm; the diameter of the fourth optical element 204 is 15.2 mm; the refractive index of the fourth optical element 204 is 1.7; and the Abbe number of the fourth optical element 204 is 30.1.

[0050] Referring to Figures 1 to 3 As shown in some embodiments of the present application, the middle lens 200 assembly comprises: a fifth optical element 205, which is configured as a negative meniscus lens; wherein the focal length of the fifth optical element 205 ranges from -12 mm to -25 mm; the curvature radius of the fifth optical element 205 ranges from -21 mm < c1 < -7 mm, -32 mm < c2 < -21 mm; the thickness of the fifth optical element 205 ranges from 0.5 mm to 1.5 mm; the diameter of the fifth optical element 205 ranges from 12 mm to 16 mm; the refractive index of the fifth optical element 205 ranges from 1.71 to 1.76; and the Abbe number of the fifth optical element 205 ranges from 24 to 36.

[0051] As a specific example, the focal length of the fifth optical element 205 is -17.6 mm; the curvature radius of the fifth optical element 205 is c1 = -7.6 mm, c2 = -16.4 mm; the thickness of the fifth optical element 205 is 0.78 mm; the diameter of the fifth optical element 205 is 15 mm; the refractive index of the fifth optical element 205 is 1.80; and the Abbe number of the fifth optical element 205 is 25.5.

[0052] Referring to Figures 1 to 3As shown in the drawings, in some embodiments of the present application, the middle lens 200 assembly comprises: a sixth optical element 206, the sixth optical element 206 is configured as a positive meniscus lens; wherein the focal length of the sixth optical element 206 is in the range of 21mm to 40mm; the curvature radius of the sixth optical element 206 is in the range of -35mm

[0053] As a specific example, the focal length of the sixth optical element 206 is 28.9mm; the curvature radius of the sixth optical element 206 is c1=-19.3mm, c2=-11.4mm; the thickness of the sixth optical element 206 is 3.7mm; the diameter of the sixth optical element 206 is 18.6mm; the refractive index of the sixth optical element 206 is 1.77; and the Abbe number of the sixth optical element 206 is 49.6.

[0054] Referring to Figures 1 to 3 As shown in the drawings, in some embodiments of the present application, the middle lens 200 assembly comprises: a seventh optical element 207, the seventh optical element 207 is configured as a negative meniscus lens; wherein the focal length of the seventh optical element 207 is in the range of 36mm to 55mm; the curvature radius of the seventh optical element 207 is in the range of -96mm

[0055] As a specific example, the focal length of the seventh optical element 207 is 45mm; the curvature radius of the seventh optical element 207 is c1=-68.6mm, c2=-24.7mm; the thickness of the seventh optical element 207 is 2.5mm; the diameter of the seventh optical element 207 is 23.4mm; the refractive index of the seventh optical element 207 is 1.82; and the Abbe number of the seventh optical element 207 is 46.5.

[0056] Referring to Figures 1 to 3As shown in some embodiments of the present application, the lens 200 assembly includes: an eighth optical element 208 configured as a negative meniscus lens; wherein the focal length of the eighth optical element 208 is in the range of 40mm to 65mm; the curvature radius of the eighth optical element 208 is in the range of 35mm

[0057] As a specific example, the focal length of the eighth optical element 208 is 58.4mm; the curvature radius of the eighth optical element 208 is c1=46.2mm, c2=-638.1; the thickness of the eighth optical element 208 is 2.5mm; the diameter of the eighth optical element 208 is 26.1mm; the refractive index of the eighth optical element 208 is 1.73; and the Abbe number of the eighth optical element 208 is 54.7.

[0058] Referring to Figures 1 to 3 As shown in some embodiments of the present application, the first optical element 201, the second optical element 202, the third optical element 203, the fourth optical element 204, the fifth optical element 205, the sixth optical element 206, the seventh optical element 207 and the eighth optical element 208 are sequentially arranged.

[0059] As a specific solution, in some embodiments of the present application, the distance (on-axis distance) between the first optical element 201, the second optical element 202, the third optical element 203, the fourth optical element 204, the fifth optical element 205, the sixth optical element 206, the seventh optical element 207 and the eighth optical element 208 is 4.82mm, 0.58mm, 1.11mm, 3.8mm, 5.73mm, 0.52mm, 0.5mm, 0.5mm, respectively.

[0060] It should be noted that in the present application, c1 represents the spherical curvature on the object side, and the curvature c2 represents the spherical curvature on the imaging sensor 300 side. A positive value represents bending towards the object side, and a negative value represents bending towards the sensor side, i.e. a positive value represents bending towards the sensor, and a negative value represents bending towards the object 2.

[0061] The front lens 200 assembly (i.e. the first optical element 201) is mainly used to compress the incident angle of the off-axis field of view, the middle lens 200 assembly can be designed as an approximately symmetric stop, which can automatically correct distortion, axial chromatic aberration and coma; the rear lens 200 assembly (i.e. the eighth optical element 208) is used to compress the incident angle of the incident to the image plane.

[0062] More specifically, the first optical element 201 generates a large amount of positive axial external spherical aberration which is balanced by the negative spherical aberration generated by the second optical element 202, the third optical element 203, the sixth optical element 206, and the seventh optical element 207. The fourth optical element 204 and the fifth optical element 205 generate overcorrected image surface curvature which is corrected by the image surface curvature generated by the second optical element 202, the third optical element 203, the seventh optical element 207, and the eighth optical element 208. The concave surface of the fourth optical element 204 and the fifth optical element 205 generates a large amount of higher-order spherical aberration and higher-order astigmatism which is balanced by the negative spherical aberration and astigmatism generated by the concave surface of the second optical element 202, the third optical element 203, and the sixth optical element 206. The sixth optical element 206, the seventh optical element 207, and the eighth optical element 208 control the angle of incidence of the large field of view at the image surface. The correction of the axial primary chromatic aberration is corrected by the reasonable distribution of the optical power, the selection of the glass material, and the height of the different light rays on the lens.

[0063] Referring to Figures 1 to 3 As a second aspect, the application further provides an industrial camera 1 mainly comprising the above-mentioned lens 200. More specifically, the industrial camera 1 is a 3D industrial camera 1 using laser triangulation.

[0064] Referring to Figure 1 In some embodiments of the application, the industrial camera 1 further comprises an aperture stop 400 which is arranged on the optical path of the above-mentioned lens 200 and has a diameter ranging from 5.6mm to 8.4mm.

[0065] Referring to Figure 2 The lens 200 of the application can be arranged between the window lens 100 and the imaging sensor 300 of the industrial camera 1 to realize the imaging of the measured part object surface 2 on the imaging sensor 300.

[0066] Referring to Figure 2 As shown in the above-mentioned specific scheme, the lens 200 is simulated on the optical path, and as shown in Figure 4 and Figure 3 It can be seen that the distortion of the lens 200 at each point of the object surface 2 is well controlled.

[0067] Referring to Figure 3 As shown in the above-mentioned specific scheme, the lens 200 is simulated on the optical path, and as shown in Figure 4 As shown in the above-mentioned specific scheme, the lens 200 is simulated on the optical path, and as shown in

[0068] The Sharm lens 200 is divided into optical distortion and keystone distortion, the keystone distortion is an inherent property, and the optical distortion is related to the design of the lens 200; the full field distortion is the maximum distortion in the entire field of view, and the full field distortion includes full field optical distortion and full field keystone distortion; the specific distortion calculation method is: distortion = (actual image height-ideal image height) / ideal image height.

[0069] ​ The optical distortion curve of the lens 200 for the working distance of 180 mm is shown in FIG. 6, in which the horizontal coordinate is the distortion percentage, and the vertical coordinate is the field of view angle.

[0070] The above description is merely some preferred embodiments of the present disclosure and a description of the principles of the technology used. Those skilled in the art should understand that the scope of the application involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the above inventive concept. For example, the above features are replaced with each other to form a technical solution with similar functions disclosed in the embodiments of the present disclosure (but not limited to).

Claims

1. A lens, characterized in that, Comprising: A front optical component for compressing the incident angle of an off-axis field of view; A middle optical component for at least correcting lens distortion; A rear optical component for compressing the incident angle onto the image plane; Wherein, the working distance of the lens ranges from 140 mm to 270 mm; the aperture ranges from F2.4 to F3.6; the full-field optical distortion of the lens within the above working distance range is less than 0.25%.

2. The lens according to claim 1, wherein in, The front optical component includes: A first optical element configured as a negative meniscus lens; Wherein, the focal length of the first optical element ranges from -50 mm to -90 mm; the radius of curvature of the first optical element ranges from 36 mm < c1 < 52 mm, 14 mm < c2 < 30 mm; the thickness of the first optical element ranges from 0.8 mm to 2.1 mm; the diameter of the first optical element ranges from 28 mm to 32 mm; the refractive index of the first optical element ranges from 1.50 to 1.59; the Abbe number of the first optical element ranges from 58 to 63.

3. The lens according to claim 2, Wherein The middle optical component includes: A second optical element configured as a positive plano-convex lens; Wherein, the focal length of the second optical element ranges from 40 mm to 80 mm; the radius of curvature of the second optical element ranges from 23 mm < c1 < 45 mm, 100 mm < c2 < 180 mm; the thickness of the second optical element ranges from 2.3 mm to 3.2 mm; the diameter of the second optical element ranges from 22 mm to 26 mm; the refractive index of the second optical element ranges from 1.59 to 1.71; the Abbe number of the second optical element ranges from 42 to 59.

4. The lens according to claim 3, characterized in that, Wherein The front optical component Includes: The middle optical component includes: A third optical element configured as a positive meniscus lens; Wherein, the focal length of the third optical element ranges from 20 mm to 50 mm; the radius of curvature of the third optical element ranges from 23 mm < c1 < 45 mm, 100 mm < c2 < 180 mm; the thickness of the third optical element ranges from 2.3 mm to 3.2 mm; the diameter of the third optical element ranges from 16 mm to 22 mm; the refractive index of the third optical element ranges from 1.69 to 1.78; the Abbe number of the third optical element ranges from 50 to 55.

5. The lens according to claim 4, wherein in, The middle optical component includes: A fourth optical element configured as a negative meniscus lens; Among them, the focal length of the fourth optical element ranges from -16 mm to -45 mm; the radius of curvature of the fourth optical element ranges from 13 mm < c1 < 22 mm, 5 mm < c2 < 13 mm; the thickness of the fourth optical element ranges from 1.2 mm to 2.2 mm; the diameter of the fourth optical element ranges from 12 mm to 14 mm; the refractive index of the fourth optical element ranges from 1.71 to 1.76; the Abbe number of the fourth optical element ranges from 24 to 36.

6. The lens according to claim 5, wherein in, the middle optical assembly includes: a fifth optical element configured as a negative meniscus lens; Among them, the focal length of the fifth optical element ranges from -12 mm to -25 mm; the radius of curvature of the fifth optical element ranges from -21 mm < c1 < -7 mm, -32 mm < c2 < -21 mm; the thickness of the fifth optical element ranges from 0.5 mm to 1.5 mm; the diameter of the fifth optical element ranges from 12 mm to 16 mm; the refractive index of the fifth optical element ranges from 1.71 to 1.76; the Abbe number of the fifth optical element ranges from 24 to 36.

7. The lens according to claim 6, wherein in, the middle optical assembly includes: a sixth optical element configured as a positive meniscus lens; Among them, the focal length of the sixth optical element ranges from 21 mm to 40 mm; the radius of curvature of the sixth optical element ranges from -35 mm < c1 < -21 mm, -9 mm < c2 < -19 mm; the thickness of the sixth optical element ranges from 3 mm to 4 mm; the diameter of the sixth optical element ranges from 17 mm to 21 mm; the refractive index of the sixth optical element ranges from 1.75 to 1.86; the Abbe number of the sixth optical element ranges from 36 to 48.

8. The lens according to claim 7, wherein the middle optical assembly includes: a seventh optical element configured as a negative meniscus lens; Among them, the focal length of the seventh optical element ranges from 36 mm to 55 mm; the radius of curvature of the seventh optical element ranges from -96 mm < c1 < 70 mm, -42 mm < c2 < -22 mm; the thickness of the seventh optical element ranges from 2 mm to 3.6 mm; the diameter of the seventh optical element ranges from 22 mm to 24 mm; the refractive index of the seventh optical element ranges from 1.80 to 1.92; the Abbe number of the seventh optical element ranges from 42 to 53.

9. The lens according to claim 8, wherein in, the middle optical assembly includes: an eighth optical element configured as a negative meniscus lens; Among them, the focal length of the eighth optical element ranges from 40 mm to 65 mm; the radius of curvature of the eighth optical element ranges from 35 mm < c1 < 56 mm, -420 mm < c2 < -320 mm; the thickness of the eighth optical element ranges from 2 mm to 3.6 mm; the diameter of the eighth optical element ranges from 24 mm to 28 mm; the refractive index of the eighth optical element ranges from 1.71 to 1.82; the Abbe number of the eighth optical element ranges from 49 to 56.

10. The lens according to claim 9, wherein the first optical element, the second optical element, the third optical element, the fourth optical element, the fifth optical element, the sixth optical element, the seventh optical element and the eighth optical element are arranged in sequence.

11. An industrial camera, characterized in that, comprising the lens according to any one of claims 1 to 10.

12. The industrial camera according to claim 11, characterized in that, The industrial camera is a 3D industrial camera.

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