CN218938631U - 500 ten thousand pixel machine vision focusing lens - Google Patents
500 ten thousand pixel machine vision focusing lens Download PDFInfo
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- CN218938631U CN218938631U CN202223611106.4U CN202223611106U CN218938631U CN 218938631 U CN218938631 U CN 218938631U CN 202223611106 U CN202223611106 U CN 202223611106U CN 218938631 U CN218938631 U CN 218938631U
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Abstract
The application relates to the field of lenses, in particular to a 500-ten-thousand-pixel machine vision focusing lens, which comprises a shell, a fixed focus group and a focusing group, wherein the fixed focus group and the focusing group are sequentially arranged in the shell; the fixed focus group comprises a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element which are sequentially arranged; the focusing group comprises a diaphragm, a sixth lens element, a seventh lens element and an eighth lens element which are sequentially arranged; the side of the first lens element away from the second lens is an object plane; the side of the eighth lens element far away from the first lens element is an image side; the diaphragm is arranged between the fifth lens element and the sixth lens element; the focusing group can reciprocate towards a direction approaching to or away from the fixed focus group. The lens has the effect of improving the adaptability of a single lens to various working distances so as to reduce the research and development cost.
Description
Technical Field
The application relates to the field of lenses, in particular to a 500-ten-thousand-pixel machine vision focusing lens.
Background
With the upgrading and upgrading of industrial products in recent years, industrial automation technology in China is gradually formed, and the original labor-intensive industry is converted into high-tech and high-value industrial industry, wherein machine vision is a branch in industrial robots and is mainly applied to industrial detection, industrial measurement and 3D imaging.
The main application of the industrial lens is as follows: various nitre materials with different refractive indexes are ground and processed into high-precision curved surfaces, and then the lenses are combined, so that the design lens is realized.
Wherein: the focal length is the distance from the principal point to the imaging surface, the focal length determines the difference of the photographing range, the focal length is small, the imaging surface is close to the principal point and is a short focal length lens, and the drawing angle under the condition is wide angle and can photograph wide scenes; conversely, when the distance from the principal point to the imaging surface is long, the lens is a long focal length lens, and the angle of the drawing becomes narrow (telescopic).
The traditional industrial lens can only correspond to one working distance on the working distance, so that the corresponding lens is required to be designed for each equipment working distance, and the problems of high research and development cost, long period and high unit price of a single lens can be caused.
Disclosure of Invention
In order to improve the adaptability of a single lens to various working distances and reduce the research and development cost, the application provides a 500-ten-thousand-pixel machine vision focusing lens.
The 500 ten thousand pixel machine vision focusing lens that this application provided adopts following technical scheme:
a500 ten thousand pixel machine vision focusing lens comprises a shell, a fixed focus group and a focusing group which are sequentially arranged in the shell; the fixed focus group comprises a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element which are sequentially arranged;
the focusing group comprises a diaphragm, a sixth lens element, a seventh lens element and an eighth lens element which are sequentially arranged;
the side of the first lens element away from the second lens is an object plane; the side of the eighth lens element far away from the first lens element is an image side; the diaphragm is arranged between the fifth lens element and the sixth lens element;
the focusing group can reciprocate towards a direction approaching to or away from the fixed focus group.
By adopting the technical scheme, when the lens is used, the diaphragm, the six lens elements, the seventh lens element and the eighth lens element can move back and forth as the fixed focus group, so that manual focusing is convenient to realize, and as the fixed focus group moves as the rear group, the working distance between the lens and the image surface can be adjusted, the influence of camera rear focus difference can not occur, and the clear imaging effect is always kept;
based on the above effects, the single lens is adapted to various working distances through the focusing group with adjustable positions, so that the research and development cost is reduced.
Optionally, the first lens element is a meniscus lens with a focal length of-31.57; the second lens element is a biconvex lens with a focal length of-22.62; the third lens element is a meniscus lens with a focal length of-18.13; the fourth lens element is a meniscus lens with a focal length of-150.62; the fifth lens element is a biconvex lens with a focal length of-1.24; the sixth lens element is a biconcave lens with a focal length of-12.52; the seventh lens element is a biconcave lens with a focal length of 18.79; the eighth lens element is a biconvex lens with a focal length of 18.43.
Optionally, the first lens element refractive index and Abbe number should be satisfied (1.77,49.6), and the ratio of the front and back surface diameter and the radius of curvature should be satisfied (0.36,1.13);
the second lens element refractive index and Abbe number should be satisfied (1.77,49.6), and the ratio of the front and back surface diameter and the radius of curvature should be satisfied (0.85,0.244);
the third lens element refractive index and Abbe number should be satisfied (1.57,56.04), and the ratio of the front and back surface diameter and the radius of curvature should be satisfied (0.54,1.46);
the fourth lens element refractive index and Abbe number should be satisfied (1.76,52.3), and the ratio of the front and back surface diameters and the radius of curvature should be satisfied (0.86,0.74);
the fifth lens element refractive index and Abbe number should satisfy (1.67,55.5), and the ratio of the front-to-back surface diameter and the radius of curvature should satisfy (0.71,0.12).
Optionally, the refractive index and Abbe number of the sixth lens element should be satisfied (1.71,50.3), and the ratio of the front and back surface diameters and the radius of curvature should be satisfied (0.38,0.5);
the seventh lens element refractive index and Abbe number should be met (1.62,51.2), and the ratio of anterior-posterior surface diameter and radius of curvature should be met (0.23,0.30);
the eighth lens element refractive index and Abbe number should satisfy (1.76,52.3), and the ratio of the front-to-back surface diameter and the radius of curvature should satisfy (0.62,0.30).
Optionally, the diaphragm is an adjustable diaphragm, and the diaphragm needs to meet the minimum aperture f# =1.6; the aperture=9.0 mm.
Optionally, the diaphragm is a floating diaphragm, and the diaphragm needs to meet the maximum aperture f# =16; the aperture=1.0 mm.
Optionally, spacer rings are arranged between adjacent lenses in the fixed focus group.
Through adopting above-mentioned technical scheme, set up the spacer ring between different lenses, keep the reasonable interval between the adjacent lens, can also set up the spacer ring of different thickness and use according to the parameter demand of camera lens in addition, realize that the air gap between two lenses remains the design value all the time to reduce the possibility of formation of image variation.
Optionally, a threaded press ring is provided on a side of the first lens element adjacent to the second lens element.
By adopting the technical scheme, the pressing ring is adopted to fix the first lens element, so that the possibility of moving the first lens in the shell is reduced, and the stability of the lens in use is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the lens is used, the diaphragm, the six lens elements, the seventh lens element and the eighth lens element can move back and forth as the fixed focus group, so that manual focusing is convenient to realize, and as the fixed focus group is used as the back group to move, the working distance between the lens and the image surface can be adjusted, the influence of camera back focus difference can not occur, and the clear imaging effect is always kept;
2. the spacer rings with different thicknesses can be arranged for use according to the parameter requirements of the lens, so that the design value of the air gap between two lenses is always kept, and the possibility of imaging degradation is reduced.
Drawings
FIG. 1 is an overall cross-sectional view of a focus lens of the present application;
FIG. 2 is an overall cross-sectional view of a fixed focal group of the present application;
FIG. 3 is a schematic diagram of an exploded structure of a fixed focus group of the present application;
FIG. 4 is an overall cross-sectional view of a focus group of the present application;
FIG. 5 is a schematic diagram of an exploded structure of a focus group of the present application;
FIG. 6 is a diagram showing the relationship between the back and forth movement of two groups and the working distance.
Reference numerals illustrate: 1. a housing; 11. a group of groups; 12. a main barrel; 13. two groups; 14. a diaphragm adjusting cylinder; 15. a fixed cylinder; 16. a focusing barrel; 17. a CAM cartridge; 18. a C-MOUNT interface; 2. setting Jiao Zu; 21. a first lens element; 22. a second lens element; 23. a third lens element; 24. a fourth lens element; 25 a fifth lens element; 26. a spacer ring; 27. a pressing ring; 3. a focusing group; 31. a diaphragm; 32. a sixth lens element; 33. a seventh lens element; 34. and an eighth lens element.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-6.
The embodiment of the application discloses a 500 ten thousand pixel machine vision focusing lens.
Referring to fig. 1 and 2, a 500 ten thousand pixel machine vision focusing lens includes a housing 1, a fixed focus group 2, and a focus group 3; the focusing group 3 can reciprocate toward and away from the fixed focus group 2, wherein:
referring to fig. 2 and 3, the fixed focal group 2 includes a first lens element 21, a second lens element 22, a third lens element 23, a fourth lens element 24, and a fifth lens element 25, which are arranged in this order;
referring to fig. 4 and 5, the focus group 3 includes a stop 31, a sixth lens element 32, a seventh lens element 33, and an eighth lens element 34, which are disposed in this order; the side of the first lens element 21 remote from the second lens is the object plane; the side of the eighth lens element 34 away from the first lens element 21 is the image side; the diaphragm 31 is disposed between the fifth lens element 25 and the sixth lens element 32;
referring to fig. 3 and 5, spacer rings 26 with different thicknesses and shapes are arranged between adjacent lenses in the fixed focus group 2, the spacer rings 26 are arranged between the different lenses, reasonable spacing between the adjacent lenses is kept, in addition, the spacer rings 26 with different thicknesses can be arranged for use according to parameter requirements of lenses, and the air gap between the two lenses is always kept at a design value, so that the possibility of imaging degradation is reduced.
The first lens element 21 is provided with a threaded clamping ring 27 on one side close to the second lens element 22, and the clamping ring 27 is used for fixing the first lens element 21, so that the possibility of moving the first lens in the shell 1 is reduced, and the stability of the lens in use is improved.
Referring to fig. 1, the housing 1 includes a group 11 to which the fixed focus group 2 is mounted, a main cylinder 12 screwed with the group 11, and two groups 13 mounted on the inner peripheral wall of the other end of the main cylinder 12 for mounting the focusing group 3;
wherein, a diaphragm adjusting cylinder 14, a fixed cylinder 15, a focusing cylinder 16, a CAM cylinder 17 and a C-MOUNT interface 18 are sequentially arranged on the peripheral wall of the main cylinder 12; the focusing cylinder 16 and the CAM cylinder 17 are sleeved concentrically, the focusing cylinder 16 is abutted against the inner edge side of the CAM cylinder 17, a M2 x 2 inner hexagonal pointed screw is penetrated on the focusing cylinder 16 and abutted against the outer edge side of the CAM cylinder 17, in addition, a hand-screwed screw is penetrated on the focusing cylinder 16, and the hand-screwed screw penetrates through the CAM cylinder 17 and is abutted against the outer wall of the main cylinder 12; the C-MOUNT interface 18 is sleeved at one end of the two groups 13 far away from the main cylinder 12, and an M2 fastening screw is arranged on the end face of the main cylinder 12 near to one end of the C-MOUNT interface 18 in a penetrating way; the diaphragm adjusting cylinder 14 is also provided with a hand-screwed screw in a penetrating way, and the bottom end of the hand-screwed screw is abutted against the outer wall of the main cylinder 12.
When the lens is assembled, the group 11 and the main cylinder 12 are locked, the main cylinder 12 is also provided with threads matched with the group 11, then the diaphragm 31 and the two groups 13 are assembled, and two M2 headless fixing screws are locked for reinforcement; assembling the diaphragm adjusting cylinder 14, the fixing cylinder 15 and the CAM cylinder 17 with the main cylinder 12 in sequence, then assembling the focusing cylinder 16 on the assembled CAM cylinder, finally placing the C-MOUNT interface 18 at one end of the main cylinder 12 far away from the group 11, and locking screws for fixing;
when the focal length of the lens is adjusted, the focusing cylinder 16 is rotated to realize the reciprocating movement of the two groups 13 towards the direction approaching to the group 11, and the specific movement of the two groups 13 forwards and backwards is shown in fig. 6.
Referring to fig. 3 and 5, in particular, the first lens element 21 is a meniscus lens with a focal length of-31.57; the refractive index and Abbe number of the first lens element 21 should be satisfied (1.77,49.6), and the ratio of the front and rear surface diameters and the radius of curvature should be satisfied (0.36,1.13).
The second lens element 22 is a biconvex lens with a focal length of-22.62; the refractive index and Abbe number of the second lens element 22 should be satisfied (1.77,49.6), and the ratio of the front and back surface diameters and the radius of curvature should be satisfied (0.85,0.244).
The third lens element 23 is a meniscus lens with a focal length of-18.13; the refractive index and Abbe number of the third lens element 23 should be satisfied (1.57,56.04), and the ratio of the front-rear surface diameter and the radius of curvature should be satisfied (0.54,1.46).
The fourth lens element 24 is a meniscus lens with a focal length of-150.62; the fourth lens element refractive index and Abbe number should be satisfied (1.76,52.3), and the ratio of the front and back surface diameters and the radius of curvature should be satisfied (0.86,0.74).
The fifth lens element 25 is a biconvex lens with a focal length of-1.24; the refractive index and Abbe number of the fifth lens element 25 should be satisfied (1.67,55.5), and the ratio of the front-rear surface diameter and the radius of curvature should be satisfied (0.71,0.12).
The sixth lens element 32 is a biconcave lens with a focal length of-12.52; the refractive index and Abbe number of the sixth lens element 32 (L6) should be satisfied (1.71,50.3), and the ratio of the front-rear surface diameter and the radius of curvature should be satisfied (0.38,0.5).
The seventh lens element 33 is a biconcave lens with a focal length of 18.79; the seventh lens element 33 should have refractive index and Abbe number satisfying (1.62,51.2), and the ratio of the front-rear surface diameter and the radius of curvature satisfying (0.23,0.30).
The eighth lens element 34 is a biconvex lens with a focal length of 18.43. The eighth lens element 34 refractive index and Abbe number should meet (1.76,52.3), and the ratio of the front-to-back surface diameter and the radius of curvature should meet (0.62,0.30). The parameters of each lens are shown in table 1:
TABLE 1
In this embodiment, the diaphragm 31 is an adjustable diaphragm, and the diaphragm 31 needs to satisfy the minimum aperture f# =1.6; aperture 31 aperture = 9.0mm.
In another embodiment, the diaphragm 31 is a floating diaphragm, and the diaphragm 31 needs to satisfy the maximum aperture f# =16; aperture 31 aperture = 1.0mm.
The implementation principle of the 500 ten thousand-pixel machine vision focusing lens is as follows: when the diaphragm 31, the sixth lens element 32, the seventh lens element 33 and the eighth lens element 34 are simultaneously close to the object space or the image space, long-short distance imaging can be realized, because the lens close to the image plane end can move back and forth, the back focus difference caused by the thickness of the protective glass on the camera is counteracted; and in the assembly process of the design, each lens does not need to test the accuracy of the rear focus, so that the working hours are greatly saved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. A500 ten thousand pixel machine vision focusing lens, characterized by: comprises a shell (1), a stator Jiao Zu (2) and a focusing group (3) which are sequentially arranged in the shell (1);
the stator Jiao Zu (2) comprises a first lens element (21), a second lens element (22), a third lens element (23), a fourth lens element (24) and a fifth lens element (25) which are sequentially arranged;
the focusing group (3) comprises a diaphragm (31), a sixth lens element (32), a seventh lens element (33) and an eighth lens element (34) which are sequentially arranged;
the side of the first lens element (21) away from the second lens is an object plane; the side of the eighth lens element (34) away from the first lens element (21) is the image side; the diaphragm (31) is arranged between the fifth lens element (25) and the sixth lens element (32);
the focusing group (3) can reciprocate in a direction approaching or separating from the stator Jiao Zu (2).
2. A 500-ten-thousand-pixel machine vision focusing lens as defined in claim 1, wherein: -the first lens element (21) is a meniscus lens with a focal length of-31.57; the second lens element (22) is a biconvex lens with a focal length of-22.62; the third lens element (23) is a meniscus lens with a focal length of-18.13; the fourth lens element (24) is a meniscus lens with a focal length of-150.62; the fifth lens element (25) is a biconvex lens with a focal length of-1.24; the sixth lens element (32) is a biconcave lens with a focal length of-12.52; the seventh lens element (33) is a biconcave lens with a focal length of 18.79; the eighth lens element (34) is a biconvex lens with a focal length of 18.43.
3. A 500-ten-thousand-pixel machine vision focusing lens as defined in claim 2, wherein: the refractive index and Abbe number of the first lens element (21) should be satisfied (1.77,49.6), and the ratio of the front and rear surface diameters and the radius of curvature should be satisfied (0.36,1.13);
the refractive index and Abbe number of the second lens element (22) should be satisfied (1.77,49.6), and the ratio of the front and back surface diameters and the radius of curvature should be satisfied (0.85,0.244);
the refractive index and Abbe number of the third lens element (23) should be satisfied (1.57,56.04), and the ratio of the front and rear surface diameters and the radius of curvature should be satisfied (0.54,1.46);
the fourth lens element (24) has a refractive index and Abbe number (1.76,52.3) and a ratio of front and rear surface diameters to a radius of curvature (0.86,0.74);
the fifth lens element (25) should have a refractive index and Abbe number (1.67,55.5) and a ratio of front-to-back surface diameter to radius of curvature (0.71,0.12).
4. A 500-ten-thousand-pixel machine vision focusing lens as defined in claim 2, wherein: the refractive index and Abbe number of the sixth lens element (32) should be satisfied (1.71,50.3), and the ratio of the front and rear surface diameters and the radius of curvature should be satisfied (0.38,0.5);
the refractive index and Abbe number of the seventh lens element (33) should be satisfied (1.62,51.2), and the ratio of the front and rear surface diameters and the radius of curvature should be satisfied (0.23,0.30);
the eighth lens element (34) refractive index and Abbe number should satisfy (1.76,52.3), and both the front-to-back surface diameter and radius of curvature ratio satisfy (0.62,0.30).
5. A 500-ten thousand pixel machine vision focus lens as defined in claim 4, wherein: the diaphragm (31) is an adjustable diaphragm (31), and the diaphragm (31) needs to meet the minimum aperture f# =1.6; the aperture (31) aperture = 9.0mm.
6. A 500-ten thousand pixel machine vision focus lens as defined in claim 4, wherein: the diaphragm (31) is a floating diaphragm (31), and the diaphragm (31) needs to meet the maximum aperture f# =16; the aperture (31) aperture = 1.0mm.
7. A 500-ten-thousand-pixel machine vision focusing lens as defined in claim 2, wherein: spacer rings (26) are arranged between adjacent lenses in the stator Jiao Zu (2).
8. The 500-ten thousand pixel machine vision focusing lens of claim 7, wherein: a threaded clamping ring (27) is arranged on one side of the first lens element (21) close to the second lens element (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223611106.4U CN218938631U (en) | 2022-12-30 | 2022-12-30 | 500 ten thousand pixel machine vision focusing lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223611106.4U CN218938631U (en) | 2022-12-30 | 2022-12-30 | 500 ten thousand pixel machine vision focusing lens |
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| Publication Number | Publication Date |
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| CN218938631U true CN218938631U (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223611106.4U Active CN218938631U (en) | 2022-12-30 | 2022-12-30 | 500 ten thousand pixel machine vision focusing lens |
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- 2022-12-30 CN CN202223611106.4U patent/CN218938631U/en active Active
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