Industrial lens

Abstract

The application discloses an industrial lens, the number of lens groups with optical power is 2, and sequentially comprises the following from the object side to the imaging surface along the optical axis: a first lens group with negative optical power; a second lens group with positive optical power; when focusing, the first lens group moves in the optical axis direction relative to the second lens group, and the second lens group moves in the optical axis direction relative to the imaging surface. The industrial lens provided by the application can improve the imaging quality of the industrial lens by controlling the focal length ratio of the first lens group and the industrial lens and the focal length ratio of the first lens group and the second lens group. When focusing for different object distances, the first lens group moves in the optical axis direction relative to the second lens group, and the second lens group moves in the optical axis direction relative to the imaging surface, so that the industrial lens can clearly image within a wide working distance, the application range of the industrial lens is improved, the industrial lens can be adapted to a 4 / 3" inch chip, and has the advantages of a large target surface, low distortion and high resolving power.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and in particular to an industrial lens. Background Technology

[0002] An industrial lens is an optical lens specifically designed for industrial environments. Its main purpose is to capture and analyze images in the fields of machine vision, process control, and automation. In other words, an industrial lens can act as the eyes of a machine. All image information processed by an industrial system must be obtained through the lens, and the quality of the lens can directly affect the overall performance of the vision system.

[0003] Industrial lenses are typically more complex to design than ordinary optical lenses, and they need to meet higher requirements. With the rapid development of industrial automation, the demand for industrial lenses is also increasing. Existing industrial lenses always have shortcomings to varying degrees in terms of image size, distortion, image quality, and working distance. Therefore, there is a growing need for industrial lenses with larger image surfaces, less distortion, higher resolution, and wider working distances. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide an industrial lens that has at least the advantages of a large target area, low distortion, high resolution, and wide working distance.

[0005] This invention provides an industrial lens comprising two lens groups with optical power, arranged sequentially along the optical axis from the object side to the imaging plane: a first lens group with negative optical power and a second lens group with positive optical power. During focusing, the first lens group moves relative to the second lens group along the optical axis, and the second lens group moves relative to the imaging plane along the optical axis. The industrial lens satisfies the condition: -3.0. <f Q1 / f<-1.6; -2.3 <f Q1 / f Q2 <-1.2; where f Q1 f represents the effective focal length of the first lens group. Q2 f represents the effective focal length of the second lens group, and f represents the effective focal length of the industrial lens.

[0006] The industrial lens provided by this invention can improve the imaging quality of the industrial lens by controlling the focal length ratio between the first lens group and the industrial lens, and between the first lens group and the second lens group. When focusing for different object distances, the first lens group moves relative to the second lens group in the optical axis direction, and the second lens group moves relative to the imaging surface in the optical axis direction. This enables the industrial lens to achieve clear imaging over a wide working distance, improves the applicability of the industrial lens, and can be adapted to 4 / 3" inch chips. It has the advantages of large target area, low distortion, and high resolution. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of an industrial lens provided in the first embodiment of the present invention;

[0008] Figure 2 This is the F-Tanθ distortion curve of the industrial lens in the first embodiment of the present invention at an object distance of 800mm;

[0009] Figure 3 This is the MTF curve of the industrial lens in the first embodiment of the present invention at an object distance of 800mm;

[0010] Figure 4 This is the F-Tanθ distortion curve of the industrial lens in the first embodiment of the present invention at an object distance of 1200mm;

[0011] Figure 5 This is the MTF curve of the industrial lens in the first embodiment of the present invention at an object distance of 1200mm;

[0012] Figure 6 This is the F-Tanθ distortion curve of the industrial lens in the first embodiment of the present invention at an object distance of 200mm;

[0013] Figure 7 This is the MTF curve of the industrial lens in the first embodiment of the present invention at an object distance of 200mm;

[0014] Figure 8 This is a schematic diagram of the structure of an industrial lens provided in the second embodiment of the present invention;

[0015] Figure 9 This is the F-Tanθ distortion curve of the industrial lens in the second embodiment of the present invention at an object distance of 800mm;

[0016] Figure 10 This is the MTF curve of the industrial lens in the second embodiment of the present invention at an object distance of 800mm;

[0017] Figure 11 This is the F-Tanθ distortion curve of the industrial lens in the second embodiment of the present invention at an object distance of 1200mm;

[0018] Figure 12 This is the MTF curve of the industrial lens in the second embodiment of the present invention at an object distance of 1200mm;

[0019] Figure 13 This is the F-Tanθ distortion curve of the industrial lens in the second embodiment of the present invention at an object distance of 200mm;

[0020] Figure 14This is the MTF curve of the industrial lens in the second embodiment of the present invention at an object distance of 200mm;

[0021] Figure 15 This is a schematic diagram of the structure of an industrial lens provided in the third embodiment of the present invention;

[0022] Figure 16 This is the F-Tanθ distortion curve of the industrial lens in the third embodiment of the present invention at an object distance of 800mm;

[0023] Figure 17 This is the MTF curve of the industrial lens in the third embodiment of the present invention at an object distance of 800mm;

[0024] Figure 18 This is the F-Tanθ distortion curve of the industrial lens in the third embodiment of the present invention at an object distance of 1200mm;

[0025] Figure 19 This is the MTF curve of the industrial lens in the third embodiment of the present invention at an object distance of 1200mm;

[0026] Figure 20 This is the F-Tanθ distortion curve of the industrial lens in the third embodiment of the present invention at an object distance of 200mm;

[0027] Figure 21 This is the MTF curve of the industrial lens in the third embodiment of the present invention at an object distance of 200mm. Detailed Implementation

[0028] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Throughout this specification, the same reference numerals refer to the same elements.

[0030] This invention proposes an industrial lens comprising two lens groups with optical power, arranged sequentially along the optical axis from the object side to the imaging plane: a first lens group with negative optical power and a second lens group with positive optical power. During focusing, the first lens group moves relative to the second lens group along the optical axis, and the second lens group moves relative to the imaging plane along the optical axis. The industrial lens satisfies the following condition:

[0031] -3.0 <f Q1 / f<-1.6;

[0032] -2.3 <f Q1 / f Q2 <-1.2;

[0033] Among them, f Q1 f represents the effective focal length of the first lens group. Q2 denoted by f, which represents the effective focal length of the second lens group, and f represents the effective focal length of the industrial lens.

[0034] Compared to existing technologies, the industrial lens provided by this invention can improve the imaging quality of the industrial lens by controlling the focal length ratio between the first lens group and the industrial lens, and between the first lens group and the second lens group. When focusing for different object distances, the first lens group moves relative to the second lens group in the optical axis direction, and the second lens group moves relative to the imaging surface in the optical axis direction. This enables the industrial lens to achieve clear imaging over a wide working distance, expands the applicability of the industrial lens, and can be adapted to 4 / 3" inch chips. It has the advantages of large target area, low distortion, and high resolution.

[0035] Furthermore, when dealing with different object distances, industrial lenses can first keep the second lens group stationary while moving the first lens group. Once the positions of the first and second lens groups are aligned, they can then be moved simultaneously until the second lens group is aligned with the imaging plane, achieving focus. Alternatively, the first lens group can be kept stationary while moving the second lens group. Once the positions of the first and second lens groups are aligned with the imaging plane, the first lens group can be moved, and focus can be achieved once the positions of the first and second lens groups are aligned. Another approach is to dynamically move the first and second lens groups until their positions, as well as the position of the second lens group relative to the imaging plane, are aligned to achieve focus. These are just a few adjustment methods; the specific movement of the first and second lens groups can be selected based on the lens barrel structure and is not limited here, as long as the distance between the first and second lens groups and the distance between the second lens group and the imaging plane can be adjusted.

[0036] In some embodiments, the industrial lens further includes an aperture stop. Preferably, the aperture stop is a variable aperture stop. The variable aperture stop is used to limit the amount of light entering the lens at different object distances and under different environments, thereby changing the brightness of the image and improving the imaging performance and quality of the industrial lens. Preferably, the variable aperture stop is located between the first lens group and the second lens group, which can rationally allocate the functions of the first and second lens groups. For example, the first lens group receives light with a large field of view, giving the lens a larger field of view, while the second lens group corrects aberrations. This also helps to simplify the structure of the industrial lens and improve image quality. Preferably, during focusing, the variable aperture stop can move synchronously with the second lens group in the optical axis direction, better meeting the needs of the industrial lens at different object distances.

[0037] In some embodiments, the aforementioned industrial lens further includes a filter, which comprises an object-side surface and an image-side surface. The filter may be an infrared cutoff filter, used to filter out interfering light and prevent it from reaching the imaging surface of the industrial lens and affecting normal imaging. Preferably, the filter is located between the second lens group and the imaging surface, which can improve the imaging quality of the industrial lens. Preferably, during focusing, the filter can move synchronously with the second lens group in the optical axis direction, better meeting the needs of the industrial lens at different object distances.

[0038] In some implementations, the industrial lens adjusts the distance between the first lens group and the second lens group, as well as the distance between the second lens group and the imaging surface, for different object distances, so that the image is clear; the aperture of the variable aperture is adjusted according to the ambient lighting conditions to adjust the amount of light transmitted, so that the industrial lens can achieve the optimal image and improve the image quality.

[0039] In some implementations, the industrial lens satisfies the following condition:

[0040] -38 <f×IH / f Q1 <-19;

[0041] Where IH represents the true image height corresponding to the maximum field of view of the industrial lens, and f represents the effective focal length of the industrial lens. Q1 This represents the effective focal length of the first lens group. Satisfying the above condition, by reasonably controlling f×IH / f... Q1 A value that allows for a larger effective focal length and a larger imaging area is beneficial for chips with higher pixel counts.

[0042] In some implementations, the industrial lens satisfies the following condition:

[0043] 40 <f×IH / f Q2 <51;

[0044] Where IH represents the true image height corresponding to the maximum field of view of the industrial lens, and f represents the effective focal length of the industrial lens. Q2 This represents the effective focal length of the second lens group. Satisfying the above condition, by reasonably controlling f×IH / f... Q2 A value that allows for a larger effective focal length and a larger imaging area is beneficial for chips with higher pixel counts.

[0045] In some implementations, the industrial lens satisfies the following condition:

[0046] 1.6 <IH / FNO<7.5;

[0047] Where IH represents the true image height corresponding to the maximum field of view of the industrial lens, and FNO represents the aperture value of the industrial lens. Satisfying the above conditions enables the lens to have a balance between a large image area and a large aperture, which can increase the light throughput entering the lens, reduce the impact of insufficient light on the image, and enable the lens to have good imaging effects in low-light scenes, meeting the imaging needs of different bright and dark environments.

[0048] In some implementations, the industrial lens satisfies the following condition:

[0049] 1.15 <f Q2 / f<1.45;

[0050] Among them, f Q2 Let f represent the effective focal length of the second lens group and f represent the effective focal length of the industrial lens. By satisfying the above conditional expression and controlling the focal length ratio between the second lens group and the industrial lens, the image plane size of the industrial lens can be increased, giving the industrial lens the characteristics of a large image plane.

[0051] In some implementations, the industrial lens satisfies the following condition:

[0052] 2.4 <TTL / IH<3.1;

[0053] Where TTL represents the total optical length of the industrial lens, and IH represents the true image height corresponding to the maximum field of view of the industrial lens. Satisfying the above conditions enables large-area imaging of the industrial lens. Increasing pixel size within the same pixel size improves the chip's light-receiving efficiency, thereby achieving high-pixel imaging and improving image quality.

[0054] In some implementations, the industrial lens satisfies the following condition:

[0055] 5.1 <TTL / f<6.3;

[0056] Where TTL represents the total optical length of the industrial lens, and f represents the effective focal length of the industrial lens. Satisfying the above conditions ensures sufficient space within the lens to facilitate the movement of the first and second lens groups along the optical axis, enabling precise focusing at different object distances.

[0057] In some embodiments, the first lens group, along the optical axis from the object side to the imaging plane, sequentially includes: a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power. Through a reasonable allocation of optical power, the lens structure is compact while possessing the characteristics of a large field of view, low distortion, and high pixel density, better meeting the needs of industrial lenses.

[0058] Preferably, the object-side surface of the first lens is convex, and the image-side surface is concave; the object-side surface of the second lens is convex, and the image-side surface is concave; the object-side surface of the third lens is convex, and the image-side surface is concave; both the object-side and image-side surfaces of the fourth lens are convex; the object-side surface of the fifth lens is convex, and the image-side surface is concave; and the object-side surface of the sixth lens is convex, and the image-side surface is concave. By combining specific surface shapes, the imaging quality of industrial lenses can be further improved.

[0059] In some implementations, the industrial lens satisfies one or more of the following conditions:

[0060] 5.7 <f1 / f<7.5;

[0061] -1.6 <f2 / f<-1.2;

[0062] -1.5 <f3 / f<-1.1;

[0063] 2.3 <f4 / f<3.6;

[0064] -1.6 <f5 / f<-0.9;

[0065] 0.7 <f6 / f<1.2;

[0066] Where f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, f6 represents the effective focal length of the sixth lens, and f represents the effective focal length of the industrial lens. Satisfying the above conditions allows the first lens to have a suitable positive optical power, effectively converging light and compressing the overall optical length of the industrial lens; allows the second lens to have a suitable negative optical power, which helps balance various aberrations in the industrial lens and improves image quality; allows the third lens to have an appropriate negative optical power, which helps balance various chromatic aberrations in the industrial lens and improves image quality; allows the fourth lens to have an appropriate positive optical power, which helps increase the imaging area of ​​the industrial lens and improves its image quality; allows the fifth lens to have an appropriate negative optical power, which helps balance astigmatism in the industrial lens and improves its image quality; and allows the sixth lens to have an appropriate positive optical power, converging light while reducing the light refraction angle, allowing for a smooth transition of light paths, and simultaneously balancing various aberrations in the industrial lens and improving its image quality. Meeting one or more of the above conditions can reduce distortion and improve the imaging quality of industrial lenses.

[0067] In some implementations, the industrial lens satisfies the following condition: -4.1 <f1 / f Q1 <-1.9; where f1 represents the effective focal length of the first lens, f Q1 This represents the effective focal length of the first lens group. Satisfying the above conditions ensures that the first lens has an appropriate optical power ratio, which can concentrate light rays and facilitates miniaturization.

[0068] In some implementations, the industrial lens satisfies the following condition: 0.45 <f2 / f Q1 <0.85; where f2 represents the effective focal length of the second lens, f Q1 This represents the effective focal length of the first lens group. Satisfying the above conditions ensures that the second lens has an appropriate optical power ratio, which can smooth the path of forward light rays and improve resolving power.

[0069] In some implementations, the industrial lens satisfies the following condition: 0.4 <f3 / f Q1 <0.85; where f3 represents the effective focal length of the third lens, f Q1 This represents the effective focal length of the first lens group. Satisfying the above conditions ensures that the third lens has an appropriate optical power ratio, which helps to balance various aberrations in industrial lenses.

[0070] In some implementations, the industrial lens satisfies the following condition: -1.8 <f4 / f Q1<-0.8; where f4 represents the effective focal length of the fourth lens, f Q1 This represents the effective focal length of the first lens group. Satisfying the above conditions allows the fourth lens to have an appropriate optical power ratio, further converging light to reduce the rear aperture of the industrial lens, which is beneficial for miniaturization.

[0071] In some implementations, the industrial lens satisfies the following condition: 0.3 <f5 / f Q1 <0.85; where f5 represents the effective focal length of the fifth lens, f Q1 This represents the effective focal length of the first lens group. Satisfying the above condition ensures that the fifth lens has an appropriate optical power ratio, which helps reduce the sensitivity of industrial lenses.

[0072] In some implementations, the industrial lens satisfies the following condition: -0.65 <f6 / f Q1 <-0.25; where f6 represents the effective focal length of the sixth lens, f Q1 This represents the effective focal length of the first lens group. Satisfying the above condition ensures that the sixth lens has an appropriate optical power ratio, facilitating the smooth entry of light into the rear optical system.

[0073] In some embodiments, the fifth and sixth lenses form a cemented lens with positive optical power. This is used to share the chromatic aberration correction of the industrial lens, improve the resolution of the industrial lens, and at the same time make the structure of the industrial lens more compact, which is conducive to the miniaturization of the industrial lens.

[0074] In some implementations, the industrial lens satisfies the following condition: 4.5 <f 56 / f<7.3; where f 56 Let f represent the combined focal length of the fifth and sixth lenses, and let f represent the effective focal length of the industrial lens. Satisfying the above conditions helps control the light path between the fifth and sixth lenses, facilitates the mutual correction of aberrations, and makes the lens structure more compact, which is beneficial for miniaturization.

[0075] In some implementations, the industrial lens satisfies the following condition: -4.1 <f 56 / f Q1 <-1.8; where f 56 f represents the combined focal length of the fifth and sixth lenses. Q1 This represents the effective focal length of the first lens group. Satisfying the above conditions allows for optimization of the optical power of the fifth and sixth lenses, which is beneficial for improving image quality.

[0076] In some embodiments, the second lens group, along the optical axis from the object side to the imaging plane, sequentially includes: a seventh lens with positive optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, a twelfth lens with positive optical power, and a thirteenth lens with negative optical power. Through a reasonable allocation of optical power, the lens structure is compact while possessing the characteristics of a large field of view, low distortion, and high pixel density, better meeting the needs of industrial lenses.

[0077] Preferably, the image-side surface of the seventh lens is convex; both the object-side and image-side surfaces of the eighth lens are convex; both the object-side and image-side surfaces of the ninth lens are concave; both the object-side and image-side surfaces of the tenth lens are convex; both the object-side and image-side surfaces of the eleventh lens are concave; the object-side surface of the twelfth lens is concave and the image-side surface is convex; and the object-side surface of the thirteenth lens is concave and its image-side surface is convex. Through specific combinations of surface shapes, the imaging quality of industrial lenses can be further improved.

[0078] In some implementations, the industrial lens satisfies one or more of the following conditions:

[0079] 1.2 <f7 / f<1.8;

[0080] 0.45 <f8 / f<0.95;

[0081] -0.65 <f9 / f<-0.45;

[0082] 0.9 <f 10 / f<1.3;

[0083] -1.1 <f 11 / f<-0.8;

[0084] 0.9 <f 12 / f<1.25;

[0085] -1.7 <f 13 / f<-1.1;

[0086] Where f7 represents the effective focal length of the seventh lens, f8 represents the effective focal length of the eighth lens, and f9 represents the effective focal length of the ninth lens. 10 f represents the effective focal length of the tenth lens. 11 f represents the effective focal length of the eleventh lens. 12 f represents the effective focal length of the twelfth lens. 13Let f represent the effective focal length of the thirteenth lens and f represent the effective focal length of the industrial lens. Satisfying the above conditions can give the seventh lens appropriate positive power to effectively converge the light from the front of the industrial lens; give the eighth lens appropriate positive power to further converge the light from the front of the industrial lens; give the ninth lens appropriate negative power to reduce the eccentricity sensitivity of the industrial lens; give the tenth lens appropriate positive power to reduce the light refraction angle; give the eleventh lens appropriate negative power to balance various aberrations produced by the front lens; give the twelfth lens appropriate positive power to balance various aberrations of the industrial lens and improve image quality; and give the thirteenth lens appropriate negative power to increase the imaging area of ​​the industrial lens. Satisfying one or more of the above conditions can reduce the distortion of the industrial lens and improve its image quality.

[0087] In some implementations, the industrial lens satisfies the following condition: 1 <f7 / f Q2 <1.3; where f7 represents the effective focal length of the seventh lens, f Q2 This indicates the effective focal length of the second lens group. It allows the seventh lens to have appropriate positive optical power, effectively converging the light from the front of the industrial lens.

[0088] In some implementations, the industrial lens satisfies the following condition: 0.35 <f8 / f Q2 <0.7; where f8 represents the effective focal length of the eighth lens, f Q2 This represents the effective focal length of the second lens group. Satisfying the above condition allows the eighth lens to have appropriate positive optical power, further converging the light from the front of the industrial lens.

[0089] In some implementations, the industrial lens satisfies the following condition: -0.55 <f9 / f Q2 <-0.3; where f9 represents the effective focal length of the ninth lens, f Q2 This represents the effective focal length of the second lens group. Satisfying the above condition allows the ninth lens to have appropriate negative optical power, reducing the eccentricity sensitivity of the industrial lens.

[0090] In some implementations, the industrial lens satisfies the following condition: 0.65 <f 10 / f Q2 <1.05; where f 10 f represents the effective focal length of the tenth lens. Q2 This represents the effective focal length of the second lens group. Satisfying the above condition allows the tenth lens to have appropriate positive optical power and reduces the light refraction angle.

[0091] In some implementations, the industrial lens satisfies the following condition: -0.85 <f 11 / fQ2 <-0.6; where f 11 f represents the effective focal length of the eleventh lens. Q2 This represents the effective focal length of the second lens group. Satisfying the above conditions allows the eleventh lens to have an appropriate negative optical power, balancing various aberrations produced by the front lens.

[0092] In some implementations, the industrial lens satisfies the following condition: 0.7 <f 12 / f Q2 <0.9; where f 12 f represents the effective focal length of the twelfth lens. Q2 This represents the effective focal length of the second lens group. Satisfying the above conditions allows the twelfth lens to have appropriate positive optical power, balancing various aberrations in industrial lenses and improving image quality.

[0093] In some implementations, the industrial lens satisfies the following condition: -1.3 <f 13 / f Q2 <-0.7; where f 13 f represents the effective focal length of the thirteenth lens. Q2 This represents the effective focal length of the second lens group. Satisfying the above conditions allows the thirteenth lens to have an appropriate negative optical power, increasing the imaging area of ​​the industrial lens.

[0094] In some embodiments, the eighth and ninth lenses form a cemented lens. This is used to share the chromatic aberration correction of the industrial lens, improve the resolution of the industrial lens, and at the same time make the structure of the industrial lens more compact, which is conducive to the miniaturization of the industrial lens.

[0095] In some embodiments, the tenth and eleventh lenses form a cemented lens with negative optical power. This is used to share the chromatic aberration correction of the industrial lens, improve the resolution of the industrial lens, and at the same time make the structure of the industrial lens more compact, which is conducive to the miniaturization of the industrial lens.

[0096] In some embodiments, the twelfth and thirteenth lenses form a cemented lens with positive optical power. This is used to share the chromatic aberration correction of the industrial lens, improve the resolution of the industrial lens, and at the same time make the structure of the industrial lens more compact, which is conducive to the miniaturization of the industrial lens.

[0097] In some implementations, the industrial lens satisfies the following condition: 10 < |f 89 / f|<18; where f 89 Let f represent the combined focal length of the eighth and ninth lenses, and let f represent the effective focal length of the industrial lens. Satisfying the above conditions helps control the light path between the eighth and ninth lenses, facilitates mutual correction of aberrations, and makes the lens structure compact, which is beneficial for miniaturization.

[0098] In some implementations, the industrial lens satisfies the following condition: -19 <f 1011 / f<-7.5; where f 1011 Let f represent the combined focal length of the tenth and eleventh lenses, and let f represent the effective focal length of the industrial lens. Satisfying the above conditions helps control the light path between the tenth and eleventh lenses, facilitates the mutual correction of aberrations, and makes the lens structure compact, which is beneficial for miniaturization.

[0099] In some implementations, the industrial lens satisfies the following condition: 4 <f 1213 / f<8.6; where f 1213 Let f represent the combined focal length of the twelfth and thirteenth lenses, and let f represent the effective focal length of the industrial lens. Satisfying the above conditions helps control the light path between the twelfth and thirteenth lenses, facilitates the mutual correction of aberrations, and makes the lens structure compact, which is beneficial for miniaturization.

[0100] In some implementations, the industrial lens satisfies the following condition: 8<|f 89 / f Q2 |<13; where, f 89 f represents the combined focal length of the eighth and ninth lenses. Q2 This represents the effective focal length of the second lens group. Satisfying the above conditional equation can optimize the optical power of the eighth and ninth lenses, which is beneficial for improving image quality.

[0101] In some implementations, the industrial lens satisfies the following condition: -14 <f 1011 / f Q2 <-6; where f 1011 f represents the combined focal length of the tenth and eleventh lenses. Q2 This represents the effective focal length of the second lens group. Satisfying the above conditions allows for optimization of the optical power of the tenth and eleventh lenses, which is beneficial for improving image quality.

[0102] In some implementations, the industrial lens satisfies the following condition: 2.9 <f 1213 / f Q2 <6.3; where f 1213 f represents the combined focal length of the twelfth and thirteenth lenses. Q2 This represents the effective focal length of the second lens group. Satisfying the above conditional equation can optimize the optical power of the twelfth and thirteenth lenses, which is beneficial to improving image quality.

[0103] In some embodiments, the first lens to the thirteenth lens all adopt glass spherical lenses. It can effectively suppress the shift of the back focus of the industrial lens with temperature change, so as to improve the temperature stability of the industrial lens, and can further improve the imaging ability of the industrial lens.

[0104] In some embodiments, the industrial lens satisfies the following conditional formula: 0.01 < β < 0.15; where β represents the magnification corresponding to the industrial lens at different object distances. Satisfying the above conditional formula can enable the industrial lens to have a certain range of magnifications, improve its applicable range, and can be used normally under different object distance conditions. Preferably, 0.02 < β < 0.12. β = IH / D3, D3 represents the maximum object plane size corresponding to the industrial lens at different object distances, IH represents the true image height corresponding to the industrial lens at the maximum field angle, and β represents the magnification corresponding to the industrial lens at different object distances.

[0105] In some embodiments, the industrial lens satisfies the following conditional formula: 24 < D0 / D4 < 240; where D0 represents the object distance, that is, the distance from the object plane to the first lens of the industrial lens in the optical axis direction, and D4 is the distance between the first lens group and the second lens group in the optical axis direction. Satisfying the above conditional formula can ensure that the distance between the first lens group and the object plane is in a suitable working range, and improve the imaging quality of the industrial lens.

[0106] In some embodiments, the industrial lens satisfies the following conditional formula: 10 < D0 / D5 < 105; where D0 represents the object distance, that is, the distance from the object plane to the first lens of the industrial lens in the optical axis direction, and D5 is the distance between the second lens group and the imaging plane in the optical axis direction. Satisfying the above conditional formula can ensure that the distance between the second lens group and the imaging plane is in a suitable working range, and improve the imaging quality of the industrial lens.

[0107] In some embodiments, the industrial lens satisfies the following conditional formula: 0.2 < D4 / D5 < 0.65; where D4 is the distance between the first lens group and the second lens group in the optical axis direction; D5 is the distance between the second lens group and the imaging plane in the optical axis direction. Satisfying the above conditional formula can ensure that the distance between the first lens group and the second lens group is in a suitable working range, and improve the imaging quality of the industrial lens.

[0108] In some embodiments, the industrial lens satisfies the following conditional formula: 80° < FOV < 100°, 4 < FNO < 16; where FOV represents the maximum field angle of the industrial lens, and FNO represents the aperture value of the industrial lens. Satisfying the above conditional formula can improve the applicable range of the industrial lens, make the industrial lens have the characteristic of a large field of view, and can image well under different lighting environments.

[0109] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the industrial lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0110] First Embodiment

[0111] Please see Figure 1 The diagram shows a schematic of the structure of an industrial lens 100 provided in the first embodiment of the present invention. The industrial lens 100 includes, along the optical axis from the object side to the imaging plane S27, the following components in sequence: a first lens group Q1, an aperture ST, a second lens group Q2, a filter G1, and a protective glass G2. The first lens group Q1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The second lens group Q2 includes a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13.

[0112] The first lens L1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens L3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens L4 has positive optical power, and both its object-side surface S7 and image-side surface S8 are convex. The fifth lens L5 has negative optical power, its object-side surface S9 is convex, and its image-side surface is concave. The sixth lens L6 has positive optical power. The object-side surface of the fifth lens L5 is convex, and the image-side surface S11 is concave. The fifth lens L5 and the sixth lens L6 form a cemented lens with positive optical power. The image-side surface of the fifth lens L5 and the object-side surface of the sixth lens form a cemented surface S10. The seventh lens L7 has positive optical power, and both its object-side surface S12 and image-side surface S13 are convex. The eighth lens L8 has positive optical power, and both its object-side surface S14 and image-side surface are convex. The ninth lens L9 has negative optical power, and both its object-side surface S14 and image-side surface S16 are concave. The eighth lens L8 and the ninth lens L9 form a cemented lens with positive optical power. Lens L9 forms a cemented lens with negative optical power. The image-side surface of the eighth lens L8 and the object-side surface of the ninth lens L9 form the cemented surface S15. The tenth lens L10 has positive optical power, and both its object-side surface S17 and image-side surface are convex. The eleventh lens L11 has negative optical power, and both its object-side surface S17 and image-side surface S19 are concave. Lens L10 and the eleventh lens L11 form a cemented lens with negative optical power. The image-side surface of the tenth lens L10 and the object-side surface of the eleventh lens L11 form the cemented surface S18. The twelfth... Lens L12 has positive optical power, its object-side surface S20 is concave, and its image-side surface is convex. Lens L13 has negative optical power, its object-side surface is concave, and its image-side surface S22 is convex. Lens L12 and Lens L13 together form a cemented lens with positive optical power. The image-side surface of Lens L12 and the object-side surface of Lens L13 together form the cemented surface S21. The object-side surface of filter G1 is S23, and the image-side surface is S24. The object-side surface of protective glass G2 is S25, and the image-side surface is S26.

[0113] In this embodiment, the first to thirteenth lenses are all glass spherical lenses. This effectively suppresses the shift in the back focus of the industrial lens due to temperature changes, thereby improving the temperature stability of the industrial lens and further enhancing its imaging capabilities.

[0114] The relevant parameters of each lens in the industrial lens 100 provided in the first embodiment of the present invention are shown in Table 1.

[0115] Table 1

[0116]

[0117]

[0118] The relevant parameters of the industrial lens 100 provided in the first embodiment of the present invention after focusing at different object distances are shown in Table 2.

[0119] Table 2

[0120] D0(mm) D1(mm) D2 (mm) TTL(mm) D3 (mm) IH(mm) β 800 3.34 9.91 164.74 1776 60 0.03 1200 3.50 9.58 164.57 2626 60 0.02 200 2.22 12.60 166.32 499 60 0.12

[0121] Where D0 is the object distance, i.e., the distance from the object plane to the object-side surface S1 of the first lens L1 along the optical axis; D1 is the distance between the image-side surface S11 of the sixth lens L6 and the aperture ST along the optical axis; D2 is the distance between the image-side surface S24 of the filter G1 and the object-side surface S25 of the protective glass G2 along the optical axis; TTL is the total optical length of the industrial lens 100; D3 is the maximum object plane size of the industrial lens 100 at different object distances; IH is the true image height of the industrial lens 100 at its maximum field of view; β is the magnification of the industrial lens 100 at different object distances, β = IH / D3.

[0122] In this embodiment, the structural schematic diagram of the industrial lens 100, the F-Tanθ distortion curve and MTF curve at an object distance of 800mm, the F-Tanθ distortion curve and MTF curve at an object distance of 1200mm, and the F-Tanθ distortion curve and MTF curve at an object distance of 200mm are respectively shown as follows: Figures 1 to 7 As shown. Figure 1 The structure of the industrial lens 100 allows for adaptive adjustment of the dimensions D0, D1, and D2 at object distances of 800mm, 1200mm, and 200mm. It is understood that the above only lists specific examples of the industrial lens 100 at several different object distances; the industrial lens 100 proposed in this embodiment can provide clear imaging within an object distance range of 200mm to 1200mm.

[0123] Figure 2 The diagram shows the optical F-Tanθ distortion curve of the industrial lens 100 in this embodiment at an object distance of 800mm. It represents the distortion at different image heights on the imaging plane. The horizontal axis represents the distortion percentage, and the vertical axis represents the half-image height (unit: mm). As can be seen from the figure, the optical distortion is controlled within ±2%, indicating that the distortion of the industrial lens 100 is well corrected.

[0124] Figure 3The diagram shows the MTF (modulation transfer function) curve of the industrial lens 100 in this embodiment at an object distance of 800mm. It represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value is above 0.35 across the entire field of view. Within the range of 0–45 lp / mm, the MTF curve decreases smoothly and uniformly, exhibiting good imaging quality and detail resolution at both low and high frequencies.

[0125] Figure 4 The diagram shows the optical F-Tanθ distortion curve of the industrial lens 100 in this embodiment at an object distance of 1200mm. It represents the distortion at different image heights on the imaging plane. The horizontal axis represents the percentage of distortion, and the vertical axis represents the half-image height (unit: mm). As can be seen from the figure, the optical distortion is controlled within ±2%, indicating that the distortion of the industrial lens 100 is well corrected.

[0126] Figure 5 The diagram shows the MTF (Modulation Transfer Function) curve of the industrial lens 100 in this embodiment at an object distance of 1200mm. It represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value is above 0.3 throughout the entire field of view. Within the range of 0–45 lp / mm, the MTF curve decreases smoothly and evenly, exhibiting good imaging quality and detail resolution at both low and high frequencies.

[0127] Figure 6 The diagram shows the optical F-Tanθ distortion curve of the industrial lens 100 in this embodiment at an object distance of 200mm. It represents the distortion at different image heights on the imaging plane. The horizontal axis represents the distortion percentage, and the vertical axis represents the half-image height (unit: mm). As can be seen from the figure, the optical distortion is controlled within ±3%, indicating that the distortion of the industrial lens 100 is well corrected.

[0128] Figure 7 The diagram shows the MTF (modulation transfer function) curve of the industrial lens 100 in this embodiment at an object distance of 200mm. It represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value is above 0.4 throughout the entire field of view. Within the range of 0–22 lp / mm, the MTF curve decreases smoothly and evenly, exhibiting good imaging quality and detail resolution at both low and high frequencies.

[0129] Second Embodiment

[0130] The industrial lens 200 provided in the second embodiment of the present invention has a structure that is largely the same as that of the industrial lens 100 in the first embodiment. The difference is that the object side surface S12 of the seventh lens L7 is concave, the eighth lens L8 and the ninth lens L9 form a cemented lens with positive optical power, and the curvature radius and other parameters of each lens are different.

[0131] The relevant parameters of each lens in the industrial lens 200 provided in the second embodiment of the present invention are shown in Table 3.

[0132] Table 3

[0133]

[0134] The relevant parameters of the industrial lens 200 after focusing at different object distances provided in the second embodiment of the present invention are shown in Table 4.

[0135] Table 4

[0136] D0(mm) D1(mm) D2 (mm) TTL(mm) D3 (mm) IH(mm) β 800 2.69 11.29 157.27 1772 60 0.03 1200 2.85 10.93 157.07 2616 60 0.02 200 1.84 13.85 158.97 510 60 0.12

[0137] Where D0 is the object distance, i.e., the distance from the object plane to the object-side surface S1 of the first lens L1 along the optical axis; D1 is the distance between the image-side surface S11 of the sixth lens L6 and the stop ST along the optical axis; D2 is the distance between the image-side surface S24 of the filter G1 and the object-side surface S25 of the protective glass G2 along the optical axis; TTL is the total optical length of the industrial lens 200. D3 is the maximum object plane size of the industrial lens 200 at different object distances, IH is the true image height of the industrial lens 200 at the maximum field of view, β is the magnification of the industrial lens 200 at different object distances, β=IH / D3.

[0138] In this embodiment, the structural schematic diagram of the industrial lens 200, the F-Tanθ distortion curve and MTF curve at an object distance of 800mm, the F-Tanθ distortion curve and MTF curve at an object distance of 1200mm, and the F-Tanθ distortion curve and MTF curve at an object distance of 200mm are respectively shown as follows: Figures 8 to 14 As shown. Figure 8 The structure of the industrial lens 200 allows for adaptive adjustments to the dimensions of D0, D1, and D2 at object distances of 800mm, 1200mm, and 200mm. It is understood that the above only lists specific examples of the industrial lens 200 at several different object distances; the industrial lens 200 proposed in this embodiment can provide clear imaging within an object distance range of 200mm to 1200mm.

[0139] At an object distance of 800mm, from Figure 9 As can be seen, the F-Tanθ distortion of the industrial lens 200 is controlled within ±2%, indicating that the distortion of the industrial lens 200 has been well corrected; from Figure 10 As can be seen, the MTF value is above 0.3 throughout the entire field of view. Within the range of 0 to 45 lp / mm, the MTF curve decreases smoothly and evenly, demonstrating good imaging quality and detail resolution in both low and high frequency conditions.

[0140] At an object distance of 1200mm, from Figure 11 As can be seen, the F-Tanθ distortion of the industrial lens 200 is controlled within ±2%, indicating that the distortion of the industrial lens 200 has been well corrected; from Figure 12 As can be seen, the MTF value is above 0.3 throughout the entire field of view. Within the range of 0 to 45 lp / mm, the MTF curve decreases smoothly and evenly, demonstrating good imaging quality and detail resolution in both low and high frequency conditions.

[0141] When the object distance is 200mm, from Figure 13 As can be seen, the F-Tanθ distortion of the industrial lens 200 is controlled within ±3%, indicating that the distortion of the industrial lens 200 has been well corrected; from Figure 14 As can be seen, the MTF value is above 0.3 throughout the entire field of view. Within the range of 0 to 22 lp / mm, the MTF curve decreases smoothly and evenly, demonstrating good imaging quality and detail resolution in both low and high frequency conditions.

[0142] Third Embodiment

[0143] The industrial lens 300 provided in the third embodiment of the present invention has a structure that is largely the same as that of the industrial lens 100 in the first embodiment, except that the curvature radius and other parameters of each lens are different.

[0144] The relevant parameters of each lens in the industrial lens 300 provided in the third embodiment of the present invention are shown in Table 5.

[0145] Table 5

[0146]

[0147] The relevant parameters of the industrial lens 300 after focusing at different object distances provided in the third embodiment of the present invention are shown in Table 6.

[0148] Table 6

[0149] D0(mm) D1(mm) D2 (mm) TTL(mm) D3 (mm) IH β 800 3.36 9.35 166.49 1770 60 0.03 1200 3.53 8.99 166.30 2618 60 0.02 200 2.31 12.28 168.37 496 60 0.12

[0150] Where D0 is the object distance, i.e., the distance from the object plane to the object-side surface S1 of the first lens L1 along the optical axis; D1 is the distance between the image-side surface S11 of the sixth lens L6 and the aperture ST along the optical axis; D2 is the distance between the image-side surface S24 of the filter G1 and the object-side surface S25 of the protective glass G2 along the optical axis; TTL is the total optical length of the industrial lens 300; D3 is the maximum object plane size of the industrial lens 300 at different object distances; IH is the true image height of the industrial lens 300 at its maximum field of view; β is the magnification of the industrial lens 200 at different object distances; β = IH / D3.

[0151] In this embodiment, the structural schematic diagram of the industrial lens 300, the F-Tanθ distortion curve and MTF curve at an object distance of 800mm, the F-Tanθ distortion curve and MTF curve at an object distance of 1200mm, and the F-Tanθ distortion curve and MTF curve at an object distance of 200mm are respectively as follows: Figures 15 to 21 As shown. Figure 15 The structure of the industrial lens 300 allows for adaptive adjustment of the dimensions D0, D1, and D2 at object distances of 800mm, 1200mm, and 200mm. It is understood that the above only lists specific examples of the industrial lens 300 at several different object distances; the industrial lens 300 proposed in this embodiment can provide clear imaging within an object distance range of 200mm to 1200mm.

[0152] At an object distance of 800mm, from Figure 16 As can be seen, the F-Tanθ distortion of the industrial lens 300 is controlled within ±2%, indicating that the distortion of the industrial lens 300 has been well corrected; from Figure 17 As can be seen, the MTF value is above 0.3 throughout the entire field of view. Within the range of 0 to 45 lp / mm, the MTF curve decreases smoothly and evenly, demonstrating good imaging quality and detail resolution in both low and high frequency conditions.

[0153] At an object distance of 1200mm, from Figure 18 As can be seen, the F-Tanθ distortion of the industrial lens 300 is controlled within ±2%, indicating that the distortion of the industrial lens 300 has been well corrected; from Figure 19 As can be seen, the MTF value is above 0.3 throughout the entire field of view. Within the range of 0 to 45 lp / mm, the MTF curve decreases smoothly and evenly, demonstrating good imaging quality and detail resolution in both low and high frequency conditions.

[0154] When the object distance is 200mm, from Figure 20As can be seen, the F-Tanθ distortion of the industrial lens 300 is controlled within ±3%, indicating that the distortion of the industrial lens 300 has been well corrected; from Figure 21 As can be seen, the MTF value is above 0.3 throughout the entire field of view. Within the range of 0 to 22 lp / mm, the MTF curve decreases smoothly and evenly, demonstrating good imaging quality and detail resolution in both low and high frequency conditions.

[0155] Tables 7 and 8 show the optical characteristics of the three embodiments described above at different object distances. These mainly include the object distance D0, effective focal length f, aperture number FNO, total optical length TTL, maximum field of view FOV and its corresponding true image height IH, magnification β, and the values ​​corresponding to the above conditional expressions for the industrial lens.

[0156] Table 7

[0157]

[0158] Table 8

[0159]

[0160]

[0161] In summary, the industrial lens provided by this invention can improve the imaging quality of the industrial lens by controlling the focal length ratio between the first lens group and the industrial lens, and between the first lens group and the second lens group. When focusing for different object distances, the first lens group moves relative to the second lens group in the optical axis direction, and the second lens group moves relative to the imaging surface in the optical axis direction. This enables the industrial lens to achieve clear imaging over a wide working distance, expands the applicability of the industrial lens, and can be adapted to 4 / 3" inch chips. It has the advantages of large target area, low distortion, and high resolution.

[0162] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0163] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An industrial lens, characterized in that, The lens group with optical power consists of two lenses, arranged sequentially along the optical axis from the object side to the imaging plane: The first lens group with negative optical power; A second lens group with positive optical power; During focusing, the first lens group moves relative to the second lens group in the optical axis direction, and the second lens group moves relative to the imaging plane in the optical axis direction; The first lens group includes, along the optical axis from the object side to the imaging plane, a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power. The first lens group consists of six lenses with optical power. The second lens group includes, along the optical axis from the object side to the imaging plane, a seventh lens with positive optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, a twelfth lens with positive optical power, and a thirteenth lens with negative optical power. The second lens group consists of seven lenses with optical power. The industrial lens satisfies the following condition: -3.0 <fQ1 / f<-1.6; -2.3 < fQ1 / fQ2 < -1.2; Wherein, fQ1 represents the effective focal length of the first lens group, fQ2 represents the effective focal length of the second lens group, and f represents the effective focal length of the industrial lens.

2. The industrial lens according to claim 1, characterized in that, The industrial lens satisfies the following condition: -38mm <f×IH / fQ1<-19mm; Wherein, IH represents the true image height corresponding to the maximum field of view of the industrial lens, f represents the effective focal length of the industrial lens, and fQ1 represents the effective focal length of the first lens group.

3. The industrial lens according to claim 1, characterized in that, The industrial lens satisfies the following condition: 40mm <f×IH / fQ2<51mm; Wherein, IH represents the true image height corresponding to the maximum field of view of the industrial lens, f represents the effective focal length of the industrial lens, and fQ2 represents the effective focal length of the second lens group.

4. The industrial lens according to claim 1, characterized in that, The industrial lens satisfies the following condition: 1.6mm <IH / FNO<7.5mm; Wherein, IH represents the true image height corresponding to the maximum field of view of the industrial lens, and FNO represents the aperture value of the industrial lens.

5. The industrial lens according to claim 1, characterized in that, The industrial lens satisfies the following condition: 1.15 <fQ2 / f<1.45; Where fQ2 represents the effective focal length of the second lens group, and f represents the effective focal length of the industrial lens.

6. The industrial lens according to claim 1, characterized in that, The industrial lens satisfies the following condition: 2.4 <TTL / IH<3.1; Wherein, TTL represents the total optical length of the industrial lens, and IH represents the true image height corresponding to the maximum field of view of the industrial lens.

7. The industrial lens according to claim 1, characterized in that, The industrial lens satisfies the following condition: -2.83≤fQ1 / f≤-1.71; -2.09≤fQ1 / fQ2≤-1.39; Wherein, fQ1 represents the effective focal length of the first lens group, fQ2 represents the effective focal length of the second lens group, and f represents the effective focal length of the industrial lens.

8. The industrial lens according to claim 1, characterized in that, The first lens has a convex object-side surface and a concave image-side surface; the second lens has a convex object-side surface and a concave image-side surface; the third lens has a convex object-side surface and a concave image-side surface; the fourth lens has both a convex object-side surface and a convex image-side surface; the fifth lens has a convex object-side surface and a concave image-side surface; and the sixth lens has a convex object-side surface and a concave image-side surface. The image-side surface of the seventh lens is convex; the object-side surface and the image-side surface of the eighth lens are both convex; the object-side surface and the image-side surface of the ninth lens are both concave; the object-side surface and the image-side surface of the tenth lens are both convex; the object-side surface and the image-side surface of the eleventh lens are both concave; the object-side surface of the twelfth lens is concave and the image-side surface is convex; the object-side surface of the thirteenth lens is concave and its image-side surface is convex.

9. The industrial lens according to any one of claims 1 to 8, characterized in that, The industrial lens satisfies one or more of the following conditions: 5.7 <f1 / f<7.5; -1.6 <f2 / f<-1.2; -1.5 <f3 / f<-1.1; 2.3 <f4 / f<3.6; -1.6 <f5 / f<-0.9; 0.7 <f6 / f<1.2; Wherein, f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, f6 represents the effective focal length of the sixth lens, and f represents the effective focal length of the industrial lens.

10. The industrial lens according to any one of claims 1 to 8, characterized in that, The industrial lens satisfies one or more of the following conditions: 1.2 <f7 / f<1.8; 0.45 <f8 / f<0.95; -0.65 <f9 / f<-0.45; 0.9 <f10 / f<1.3; -1.1 <f11 / f<-0.8; 0.9 <f12 / f<1.25; -1.7 <f13 / f<-1.1; Wherein, f7 represents the effective focal length of the seventh lens, f8 represents the effective focal length of the eighth lens, f9 represents the effective focal length of the ninth lens, f10 represents the effective focal length of the tenth lens, f11 represents the effective focal length of the eleventh lens, f12 represents the effective focal length of the twelfth lens, f13 represents the effective focal length of the thirteenth lens, and f represents the effective focal length of the industrial lens.

Images