CN212009129U - Short-focus high-resolution visual lens - Google Patents
Short-focus high-resolution visual lens Download PDFInfo
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- CN212009129U CN212009129U CN202020083258.3U CN202020083258U CN212009129U CN 212009129 U CN212009129 U CN 212009129U CN 202020083258 U CN202020083258 U CN 202020083258U CN 212009129 U CN212009129 U CN 212009129U
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Abstract
The utility model relates to a short-focus high-resolution visual lens, which comprises a lens cone and an optical system arranged in the lens cone, wherein the optical system comprises a front lens group A with negative focal power, an iris diaphragm, a rear lens group B with positive focal power and an imaging surface which are sequentially arranged from left to right along the light incidence direction; the front lens group A comprises a first negative crescent lens, a first positive crescent lens, a second positive crescent lens, a first biconvex lens and a first biconcave lens which are arranged in sequence from left to right; the rear lens group B comprises a second biconcave lens, a second biconvex lens, a third biconvex lens and a fourth biconvex lens which are sequentially arranged from left to right. The utility model discloses compact structure, easy and simple to handle adopt half group to remove the focusing mode, can realize that the high definition formation of image and the optical distortion of 200mm object distance are less than-0.8%, can provide the clear image that is superior to 1000 ten thousand pixel high resolutions for industrial automation detecting system.
Description
Technical Field
The utility model relates to a short focus high resolution vision camera lens.
Background
With the rise of industrial automation, more and more automatic factory industries rely on machine vision to replace manual vision for visual inspection: such as artificial intelligence logistics code scanning, mechanical dimension measurement, part defect detection, and the like. In addition, with the continuous development of industrial cameras and the continuous improvement of chip pixels, a higher resolution, a lower distortion, a closer work object distance and a smaller and more compact structural shape are provided for a machine vision lens.
Disclosure of Invention
In view of this, the utility model aims at providing a short focus high resolution vision camera lens, compact structure, easy and simple to handle, adopt half group to remove the focusing mode, can realize that the high definition formation of image and the optical distortion of 200mm object distance are less than-0.8%, can provide the clear image that is superior to 1000 ten thousand pixels high resolutions for industrial automation detecting system, make this optical system can satisfy present artificial intelligence commodity circulation and sweep relevant detection requirements such as sign indicating number, mechanical dimensions measurement, part defect detection to provide more small-size, compacter camera lens vision scheme for machine vision.
The technical scheme of the utility model is that: a short-focus high-resolution visual lens comprises a lens barrel and an optical system arranged in the lens barrel, wherein the optical system comprises a front lens group A with negative focal power, an iris diaphragm, a rear lens group B with positive focal power and an imaging surface which are sequentially arranged from left to right along the incident direction of light; the front lens group A comprises a first negative crescent lens, a first positive crescent lens, a second positive crescent lens, a first biconvex lens and a first biconcave lens which are sequentially arranged from left to right, and the first biconvex lens and the first biconcave lens form a first cementing group; the rear lens group B comprises a second biconcave lens, a second biconvex lens, a third biconvex lens and a fourth biconvex lens which are sequentially arranged from left to right, and the second biconcave lens and the second biconvex lens form a second bonding group.
Further, the air space between the first negative crescent lens and the first positive crescent lens is 9.34mm, the air space between the first positive crescent lens and the second positive crescent lens is 7.55mm, the air space between the second positive crescent lens and the first biconvex lens is 2.79mm, the air space between the first biconcave lens and the second biconcave lens is 4.35mm, the air space between the first biconcave lens and the iris diaphragm is 1.35mm, the air space between the second biconvex lens and the third biconvex lens is 0.1mm, the air space between the third biconvex lens and the fourth biconvex lens is 0.51mm-2.39mm, and the air space between the fourth biconvex lens and the imaging surface is 9.28 mm.
Furthermore, the lens cone comprises a main lens cone, a front lens cone arranged at the front end of the main lens cone is arranged in the main lens cone, a rear lens cone is arranged at the rear end of the front lens cone, a connecting flange is arranged behind the main lens cone, a cone end screw B for connecting the front lens cone and the rear lens cone is arranged between the front lens cone and the rear lens cone, a focusing rotating wheel capable of rotating relative to the front lens cone is arranged at the periphery of the front lens cone, a focusing ring is arranged at the periphery of the focusing rotating wheel, the focusing rotating wheel and the front lens cone are connected through multi-head threads, a cone end screw A for connecting an adjusting ring and the adjusting rotating wheel is arranged between the adjusting ring and the adjusting rotating wheel, a limiting lug is arranged at the front end of the main lens cone, a limiting groove matched with the limiting lug is arranged on the focusing ring, the limiting groove is distributed at the rear end of the focusing ring in a surrounding manner, the diaphragm ring is provided with a diaphragm guide pin along the radial direction, the lower end of the diaphragm guide pin is connected with the diaphragm rocking handle, and the main lens cone is provided with a diaphragm limiting groove for limiting the rotation angle of the diaphragm guide pin.
Further, the front lens group a is mounted in the front lens barrel, the iris diaphragm is fixed at the rear end of the front lens barrel, the second biconcave lens, the second biconvex lens and the third biconvex lens of the rear lens group B are mounted in the rear lens barrel, the fourth biconvex lens is mounted in the connecting flange, a pressing ring a is arranged on the left side of the first negative crescent lens, a spacer ring a is arranged between the first negative crescent lens and the first positive crescent lens, a spacer ring B is arranged between the first positive crescent lens and the second positive crescent lens, a spacer ring C is arranged between the second positive crescent lens and the first biconvex lens, a spacer ring D is arranged between the second biconvex lens and the third biconvex lens, a pressing ring B is arranged on the right side of the third biconvex lens, and a pressing ring C is arranged on the right side of the fourth biconvex lens.
Furthermore, a limiting guide nail is radially arranged on the outer periphery of the rear lens cone, and a guide groove which is matched with the limiting guide nail and extends along the axial direction is arranged on the inner periphery of the main lens cone.
Furthermore, a locking pin A for locking the focusing rotating wheel is arranged on the periphery of the main lens cone in a penetrating mode along the radial direction, and a locking pin B for locking and fixing the diaphragm ring on the main lens cone is arranged on the periphery of the diaphragm ring in a penetrating mode along the radial direction.
Furthermore, the front end of the front lens cone is provided with a light filter, and the light filter is in threaded connection with the front lens cone.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses compact structure, easy and simple to handle adopt half group to remove the focusing mode, can realize that high definition formation of image and optical distortion of 200mm object distance are less than-0.8%, can provide the clear image that is superior to 1000 ten thousand pixel high resolutions for industrial automation detecting system, make this optical system can satisfy present artificial intelligence commodity circulation and sweep relevant detection requirements such as sign indicating number, mechanical dimensions measurement, part defect detection to for machine vision provides more small-size, compacter camera lens vision scheme.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical system according to an embodiment of the present invention before focusing;
fig. 3 is a schematic structural diagram of the optical system according to the embodiment of the present invention after focusing;
fig. 4 is a MTF graph of an embodiment of the present invention;
fig. 5 is a graph showing the distortion change of the embodiment of the present invention;
in the figure: 1. an optical filter; 2. pressing a ring A; 3. a focusing ring; 4. a cone end screw A; 5. a focusing runner; 6. a front barrel; 7. a main barrel; 8. a rear barrel; 9. a cone end screw B; 10. diaphragm guide pins; 11. a diaphragm limiting groove; 12. a diaphragm ring; 13. a diaphragm rocking handle; 14. an imaging plane; 15. a connecting flange; 16. a first negative crescent lens; 17. pressing a ring C; 18. a fourth lenticular lens; 19. a third biconvex lens; 20. a second biconvex lens; 21. a space ring D; 22. pressing a ring B; 23. a second biconcave lens; 24. an iris diaphragm; 25. a first biconcave lens; 26. a first biconvex lens; 27-limiting guide pins; 28. a guide groove; 29. a locking nail B; 30. a space ring C; 31. a locking nail A; 32. a second positive meniscus lens; 33. a space ring B; 34. a first positive meniscus lens; 35. and a space ring A.
Detailed Description
As shown in fig. 1 to 5, a short-focus high-resolution vision lens includes a lens barrel and an optical system disposed in the lens barrel, wherein the optical system includes a front lens group a having a negative focal power, an iris diaphragm, a rear lens group B having a positive focal power, and an image plane sequentially disposed from left to right along a light incidence direction; the front lens group A comprises a first negative crescent lens, a first positive crescent lens, a second positive crescent lens, a first biconvex lens and a first biconcave lens which are sequentially arranged from left to right, and the first biconvex lens and the first biconcave lens form a first cementing group; the rear lens group B comprises a second biconcave lens, a second biconvex lens, a third biconvex lens and a fourth biconvex lens which are sequentially arranged from left to right, and the second biconcave lens and the second biconvex lens form a second bonding group.
In this embodiment, the air space between the first negative crescent lens and the first positive crescent lens is 9.34mm, the air space between the first positive crescent lens and the second positive crescent lens is 7.55mm, the air space between the second positive crescent lens and the first biconvex lens is 2.79mm, the air space between the first biconcave lens and the second biconcave lens is 4.35mm, the air space between the first biconcave lens and the iris diaphragm is 1.35mm, the air space between the second biconvex lens and the third biconvex lens is 0.1mm, the air space between the third biconvex lens and the fourth biconvex lens is 0.51mm to 2.39mm, and the air space between the fourth biconvex lens and the imaging surface is 9.28 mm.
In the embodiment, the lens cone comprises a main lens cone, a front lens cone is arranged in the main lens cone and positioned at the front end of the main lens cone, a rear lens cone is arranged at the rear end of the front lens cone, a connecting flange is arranged behind the main lens cone, a cone end screw B for connecting the front lens cone and the rear lens cone is arranged between the front lens cone and the rear lens cone, a focusing rotating wheel which can rotate relative to the front lens cone is arranged at the periphery of the front lens cone, a focusing ring is arranged at the periphery of the focusing rotating wheel, the focusing rotating wheel and the front lens cone are connected through a multi-head thread, a cone end screw A for connecting an adjusting ring and the adjusting rotating wheel is arranged between the adjusting ring and the adjusting rotating wheel, a limiting lug is arranged at the front end of the main lens cone, a limiting groove which is matched with the limiting lug is arranged on the focusing ring, the limiting groove is distributed at the rear end of, the diaphragm ring is provided with a diaphragm guide pin along the radial direction, the lower end of the diaphragm guide pin is connected with the diaphragm rocking handle, and the main lens cone is provided with a diaphragm limiting groove for limiting the rotation angle of the diaphragm guide pin. The focusing rotating wheel is connected with the front lens barrel through a multi-start thread, and the thread pitch of the multi-start thread is 1mm, so that the system is more accurate in focusing; the front end of the main lens cone is provided with the limiting lug, and the focusing ring is provided with the limiting groove matched with the limiting lug, so that the lenses in the front lens cone and the rear lens cone can be prevented from exceeding the moving stroke, and the high-definition imaging of the lens with the object distance of 200mm is ensured; the iris diaphragm is fixed at the rear end of the front lens barrel, so that the stability of the iris diaphragm is effectively improved, and the lens is smaller and more compact; the diaphragm limiting groove is formed in the periphery of the main lens barrel, so that the limit use of opening and closing of the diaphragm is effectively avoided, and the stability of the use of the diaphragm is guaranteed.
In the present embodiment, the front lens group a is mounted in the front barrel, the iris is fixed at the rear end of the front barrel, the second biconcave lens, the second biconvex lens and the third biconvex lens of the rear lens group B are mounted in the rear barrel, the fourth biconvex lens is mounted in the connecting flange, the pressing ring a is disposed on the left side of the first negative crescent lens, the spacer a is disposed between the first negative crescent lens and the first positive crescent lens, the spacer B is disposed between the first positive crescent lens and the second positive crescent lens, the spacer C is disposed between the second positive crescent lens and the first biconvex lens, the spacer D is disposed between the second biconvex lens and the third biconvex lens, the pressing ring B is disposed on the right side of the third biconvex lens, and the pressing ring C is disposed on the right side of the fourth biconvex lens.
In this embodiment, the outer circumference of the rear lens barrel is radially provided with a limiting guide pin, and the inner circumference of the main lens barrel is provided with a guide groove which is matched with the limiting guide pin and extends along the axial direction. In the process of moving the front lens cone and the rear lens cone back and forth, the front lens cone and the rear lens cone are prevented from rotating around the central shaft by the matching of the guide groove and the limiting guide nail, so that the front lens cone and the rear lens cone can only move back and forth in the axial direction.
In this embodiment, a locking pin a for locking the focusing wheel is radially inserted through the outer periphery of the main barrel, and a locking pin B for locking and fixing the diaphragm ring on the main barrel is radially inserted through the outer periphery of the diaphragm ring.
In this embodiment, the front end of the front barrel is provided with the optical filter, and the optical filter is connected with the front barrel through threads.
In this example, the parameters of each lens are shown in the following table:
TABLE 1 specific lens parameters are as follows
In this embodiment, the technical indexes of the optical system are as follows:
image plane size: 2/3"
Effective focal length: 12mm
③ short shooting distance: 200mm
Optical distortion: less than or equal to-0.8 percent
Relative aperture: f2.8
Resolution: more than or equal to 1000 ten thousand pixels
Seventh focal length: 9.28mm (in air)
The operating wavelength is: 450 nm-750 nm
The specific implementation process comprises the following steps: (1) when light rays enter, the light path sequentially enters the front lens group A, the iris diaphragm and the rear lens group B and then images on an imaging surface, when the light rays pass through the first negative crescent lens, the light rays are refracted by the concave surface of the lens and then dispersed outwards along the direction of an optical axis, and invalid light rays are intercepted and filtered by the spacer ring A; when light passes through the first positive crescent lens, the light is refracted by the convex surface of the lens and then is converged inwards along the direction of the optical axis, wherein invalid light is eliminated by the reflection part of the inner wall of the space ring B; when the light passes through the second positive crescent lens, the light is refracted by the concave surface of the lens and then is converged inwards along the direction of the optical axis, wherein invalid light is further eliminated by being reflected by the inner wall of the space ring C; when light passes through a first bonding group consisting of a first biconvex lens and a first biconcave lens, the light is refracted by two lenses with different refractive indexes, and the emitted light is converged and penetrated to the position of the diaphragm along the direction of the optical axis; when light passes through a second bonding group consisting of a second biconcave lens and a second biconvex lens, the light is refracted by two lenses with different refractive indexes, and the emitted light is dispersed along the optical axis direction and is intercepted and filtered by a spacing ring D; when the light passes through the third biconvex lens, the light is refracted by the convex surface of the lens and then is dispersed outwards along the direction of the optical axis, wherein invalid light is further intercepted and filtered by the inner wall of the pressing ring B; when light passes through the fourth biconvex lens, the refracted light is converged and projected on an imaging surface inwards along the optical axis direction, so that the integrity of the whole optical system is ensured, and particularly, the first gluing set and the second gluing set are respectively arranged at the front and the back of the iris diaphragm, so that the distortion and the aberration of a light path can be corrected; (2) when the lens is used, when focusing is needed, the focusing ring rotates by rotating the focusing ring to drive the focusing rotating wheel to rotate, the focusing rotating wheel rotates to drive the front lens cone to move back and forth by multi-start thread transmission, and the front lens group and the rear lens group are fixedly connected by a cone end screw B, so that the rear lens cone can move back and forth along with the front lens cone; when the iris diaphragm needs to be adjusted, the diaphragm ring is rotated, the diaphragm ring rotates to drive the diaphragm rocking handle to rotate, the diaphragm rocking handle is adjusted to rotate to drive the iris diaphragm to rotate, and after the adjustment of the iris diaphragm is completed, the locking nail B is screwed tightly to lock and fix the diaphragm ring on the main lens cone.
Above-mentioned operation flow and software and hardware configuration only do as the preferred embodiment of the utility model discloses a not therefore restrict the patent scope of the utility model, all utilize the utility model discloses the equivalent transform of doing of description and attached drawing content, or directly or indirectly use in relevant technical field, all the same reason is included in the patent protection scope of the utility model.
Claims (7)
1. A short focal length high resolution vision lens, characterized by: the optical system comprises a front lens group A with negative focal power, an iris diaphragm, a rear lens group B with positive focal power and an imaging surface which are sequentially arranged from left to right along the incident direction of light; the front lens group A comprises a first negative crescent lens, a first positive crescent lens, a second positive crescent lens, a first biconvex lens and a first biconcave lens which are sequentially arranged from left to right, and the first biconvex lens and the first biconcave lens form a first cementing group; the rear lens group B comprises a second biconcave lens, a second biconvex lens, a third biconvex lens and a fourth biconvex lens which are sequentially arranged from left to right, and the second biconcave lens and the second biconvex lens form a second bonding group.
2. A short focal length high resolution vision lens as claimed in claim 1, characterized in that: the air space between the first negative crescent lens and the first positive crescent lens is 9.34mm, the air space between the first positive crescent lens and the second positive crescent lens is 7.55mm, the air space between the second positive crescent lens and the first biconvex lens is 2.79mm, the air space between the first biconcave lens and the second biconcave lens is 4.35mm, the air space between the first biconcave lens and the iris diaphragm is 1.35mm, the air space between the second biconvex lens and the third biconvex lens is 0.1mm, the air space between the third biconvex lens and the fourth biconvex lens is 0.51mm-2.39mm, and the air space between the fourth biconvex lens and the imaging surface is 9.28 mm.
3. A short focal length high resolution vision lens as claimed in claim 2, characterized in that: the lens cone comprises a main lens cone, a front lens cone arranged at the front end of the main lens cone is arranged in the main lens cone, a rear lens cone is arranged at the rear end of the front lens cone, a connecting flange is arranged at the rear part of the main lens cone, a cone end screw B used for connecting the front lens cone and the rear lens cone is arranged between the front lens cone and the rear lens cone, a focusing rotating wheel capable of rotating relative to the front lens cone is arranged at the periphery of the front lens cone, a focusing ring is arranged at the periphery of the focusing rotating wheel, the focusing rotating wheel is connected with the front lens cone through a multi-head thread, a cone end screw A used for connecting an adjusting ring and the adjusting rotating wheel is arranged between the adjusting ring and the adjusting rotating wheel, a limiting lug is arranged at the front end of the main lens cone, a limiting groove matched with the limiting lug is arranged on the focusing ring, the limiting groove is circumferentially distributed at the, the diaphragm ring is provided with a diaphragm guide pin along the radial direction, the lower end of the diaphragm guide pin is connected with the diaphragm rocking handle, and the main lens cone is provided with a diaphragm limiting groove for limiting the rotation angle of the diaphragm guide pin.
4. A short focal length high resolution vision lens as claimed in claim 3, characterized in that: the front lens group A is installed in the front lens cone, the iris diaphragm is fixed at the rear end of the front lens cone, the second biconcave lens, the second biconvex lens and the third biconvex lens of the rear lens group B are installed in the rear lens cone, the fourth biconvex lens is installed in the connecting flange, a pressing ring A is arranged on the left side of the first negative crescent lens, a spacing ring A is arranged between the first negative crescent lens and the first positive crescent lens, a spacing ring B is arranged between the first positive crescent lens and the second positive crescent lens, a spacing ring C is arranged between the second positive crescent lens and the first biconvex lens, a spacing ring D is arranged between the second biconvex lens and the third biconvex lens, a pressing ring B is arranged on the right side of the third biconvex lens, and a pressing ring C is arranged on the right side of the fourth biconvex lens.
5. The short focal length high resolution vision lens of claim 4, wherein: the periphery of the rear lens cone is radially provided with a limiting guide nail, and the inner periphery of the main lens cone is provided with a guide groove which is matched with the limiting guide nail and extends along the axial direction.
6. A short focal length high resolution vision lens as claimed in claim 5, characterized in that: the periphery of the main lens cone is provided with a locking nail A for locking the focusing rotating wheel in a penetrating way along the radial direction, and the periphery of the diaphragm ring is provided with a locking nail B for locking and fixing the diaphragm ring on the main lens cone in a penetrating way along the radial direction.
7. A short focal length high resolution vision lens as claimed in claim 3 or 4, characterized in that: the front end of the front lens cone is provided with a light filter, and the light filter is in threaded connection with the front lens cone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020083258.3U CN212009129U (en) | 2020-01-15 | 2020-01-15 | Short-focus high-resolution visual lens |
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| CN202020083258.3U CN212009129U (en) | 2020-01-15 | 2020-01-15 | Short-focus high-resolution visual lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061051A (en) * | 2020-01-15 | 2020-04-24 | 福建福光天瞳光学有限公司 | Short-focus high-resolution visual lens and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061051A (en) * | 2020-01-15 | 2020-04-24 | 福建福光天瞳光学有限公司 | Short-focus high-resolution visual lens and working method thereof |
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