CN210514763U - Low-distortion high-definition industrial lens - Google Patents
Low-distortion high-definition industrial lens Download PDFInfo
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- CN210514763U CN210514763U CN201921256436.1U CN201921256436U CN210514763U CN 210514763 U CN210514763 U CN 210514763U CN 201921256436 U CN201921256436 U CN 201921256436U CN 210514763 U CN210514763 U CN 210514763U
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Abstract
The utility model relates to a low distortion high definition industrial camera lens, the optical system of camera lens includes the back group B of the preceding group A of negative focal power, iris diaphragm and the positive focal power that sets gradually from preceding back incident direction along light, preceding group A has set gradually positive crescent type lens A-1, by the airtight first cemented group of positive crescent type lens A-2 and negative crescent type lens A-3 from preceding back, back group B has set gradually airtight second cemented group, biconvex lens B-3, biconvex lens B-4 by negative crescent type lens B-1 and positive crescent type lens B-2 from preceding back. The utility model discloses the camera lens has rationally optimized the focal power of preceding, back group, adopts two pieces of cementing to make up perfect correction this optical system's aberration, makes the resolution ratio of camera lens up to 800 ten thousand pixels, realizes that the high definition formation of image and the optical distortion of 200mm object distance are less than 1.3%, has reduced the distortion in the formation of image.
Description
Technical Field
The utility model relates to a low distortion high definition industrial camera lens.
Background
With the arrival of the artificial intelligence logistics era, the original logistics industry relying on manpower is gradually changed from labor intensive to technology intensive, and is upgraded from the traditional mode to robot intelligent logistics. The robot is used as a physical carrier for goods transportation, advanced technologies such as artificial intelligence capture and image intelligent identification are adopted, the labor of a machine vision system cannot be saved, intelligence is given to the industrial robot, the industrial robot has independent judgment and behavior, and the robot can adapt to different application scenes and goods forms and complete various complex tasks. In addition, with continuous innovation and development of each chip industry, higher requirements are provided for the resolution, distortion, working distance and the like of a machine vision lens.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a resolution ratio is high, and the distortion becomes the low distortion high definition industrial camera lens that can realize high definition formation of image satisfies the operation requirement of artificial intelligence commodity circulation.
The utility model discloses a following scheme realizes: an optical system of the lens comprises a front group A with negative focal power, an iris diaphragm and a rear group B with positive focal power, wherein the front group A, the iris diaphragm and the rear group B with positive focal power are sequentially arranged along the incident direction of light rays from front to back, the front group A is sequentially provided with a positive crescent lens A-1, a first adhesive combination tightly connected by the positive crescent lens A-2 and the negative crescent lens A-3, and the rear group B is sequentially provided with a second adhesive combination tightly connected by the negative crescent lens B-1 and the positive crescent lens B-2, a double convex lens B-3 and a double convex lens B-4 from front to back.
Further, the air space between the positive crescent lens 28 and the first cemented lens is 0.10mm, the air space between the front group a and the iris diaphragm is 4.40mm, the air space between the iris diaphragm and the rear group B is 2.8mm, the air space between the second cemented lens and the biconvex lens B-3 is 0.10mm, and the air space between the biconvex lens B-3 and the biconvex lens B-4 is 1.50-4.50 mm.
Further, the mechanical structure of the lens comprises a main lens cone, a rear lens cone which can move back and forth relative to the main lens cone is installed in the main lens cone, a front lens cone is installed at the front end of the rear lens cone, a connecting seat is installed at the rear end of the main lens cone, the front lens group A is installed in the front lens cone, a second glue group and a double-convex lens B-3 in the rear lens cone are installed in the rear lens cone, a double-convex lens B-4 in the rear lens cone is installed in the connecting seat, and a threaded interface connected with a camera is arranged on the periphery of the connecting seat.
Furthermore, a focusing rotating wheel in threaded fit with the front part of the rear group of lens barrels is sleeved outside the front part of the rear group of lens barrels, a focusing ring synchronously rotating with the focusing rotating wheel is sleeved outside the focusing rotating wheel, and the focusing ring is arranged at the front end of the main lens barrel and is in rotating fit with the main lens barrel.
Furthermore, the variable diaphragm is arranged at the rear end of the front group lens cone, a diaphragm turntable used for driving the variable diaphragm to rotate is further arranged at the rear end of the front group lens cone, a diaphragm adjusting ring selectively matched with the main lens cone is arranged on the periphery of the main lens cone, and the diaphragm adjusting ring is connected with a rocking handle of the diaphragm turntable through a diaphragm guide pin penetrating through the main lens cone.
Compared with the prior art, the utility model discloses following beneficial effect has: the optical system of the lens reasonably selects and matches seven optical glass materials of five groups of front and rear groups, reasonably optimizes the focal power of the front and rear groups, perfectly corrects the aberration of the optical system by adopting two cementing groups, ensures that the resolution of the lens reaches up to 800 ten thousand pixels, and meets the requirement of artificial intelligence logistics high resolution; the optical focusing adopts a focusing mode of half group movement, so that high-definition imaging of 200mm object distance is realized, optical distortion is less than 1.3 percent (as shown in figure 4), distortion is reduced in imaging, and the requirement of artificial intelligence on low distortion of logistics is met.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and related drawings.
Drawings
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the mechanical structure of the embodiment of the present invention;
fig. 3 is a MTF graph of a lens optical system according to an embodiment of the present invention;
fig. 4 is a distortion curve of a lens optical system according to an embodiment of the present invention;
the reference numbers in the figures illustrate: 1-filter size, 2-front group lens cone, 3-set screw, 4-set screw, 5-focusing rotating wheel, 6-focusing ring, 7-main lens cone, 8-diaphragm limiting groove, 9-diaphragm guide pin, 10-diaphragm adjusting ring, 11-connecting seat, 12-threaded interface, 13-connecting seat locking screw, 14-biconvex lens B-4, 15-biconvex lens B-3, 16-positive crescent lens B-2, 17-negative crescent lens B-1, 18-pressing ring C, 19-pressing ring B, 20-spacer ring B, 21-limiting guide pin, 22-variable diaphragm, 23-diaphragm locking pin, 24-focusing rotating wheel locking pin, 25-negative crescent lens A-3, 26-space ring A, 27-pressing ring A, 28-positive crescent lens A-1, 29-positive crescent lens A-2, 30-image surface and 31-rear lens barrel.
Detailed Description
As shown in fig. 1 to 2, an optical system of the lens for low-distortion high-definition industrial use includes a front group a with negative focal power, an iris diaphragm and a rear group B with positive focal power, which are sequentially arranged along a light incidence direction from front to back, the front group a is sequentially provided with a positive crescent lens a-1, a first adhesive group closely connected by the positive crescent lens a-2 and a negative crescent lens a-3 from front to back, and the rear group B is sequentially provided with a second adhesive group closely connected by the negative crescent lens B-1 and the positive crescent lens B-2, a double convex lens B-3 and a double convex lens B-4 from front to back.
In this embodiment, the air space between the positive meniscus lens 28 and the first cemented lens group is 0.10mm, the air space between the front group a and the iris diaphragm is 4.40mm, the air space between the iris diaphragm and the rear group B is 2.8mm, the air space between the second cemented lens group and the biconvex lens B-3 is 0.10mm, and the air space between the biconvex lens B-3 and the biconvex lens B-4 is 1.50 to 4.50 mm; the optical focusing adopts a focusing mode of half group movement, namely, the second cementing group and the double convex lens B-3 in the whole front group A and the whole rear group B can move back and forth, so that high-definition imaging of 200mm object distance is realized, the optical distortion is less than 1.3%, a clear image with high resolution superior to 800 ten thousand pixels can be provided for an industrial detection system, the industrial lens mainly aims at the machine vision fields of logistics code scanning, face recognition, electronic component measurement and the like, the requirement of using a small-focus lens to perform intelligent logistics code scanning in the current logistics field can be met, and a good machine vision solution is provided for the application field of continuously-enlarged artificial intelligent logistics.
The specific parameters of each lens in the lens of the invention are shown in the following table:
the optical system of the lens of the invention, which is composed of the above lenses, achieves the following optical indexes:
(1) focal length: f =20 mm;
(2) short range: m.o.d =200 mm;
(3) optical distortion: less than or equal to 1.3 percent;
(4) relative pore diameter: d/f = 1/2.8;
（5）CRA：8°；
(6) resolution ratio: better than 800 million pixels;
(7) total length of optical path: sigma is less than or equal to 36 +/-0.1 mm;
(8) applicable spectral line range: 450 nm-650 nm;
(9) the overall dimension of the lens is as follows: phi 29mm x 32.5 mm.
The optical system of the lens adopts the reasonable selection of seven five groups of optical glass materials of the front group and the rear group, reasonably optimizes the focal power of the front group and the rear group, and perfectly corrects the aberration of the optical system by adopting two bonding groups; the MTF value of the lens is enabled to be more than or equal to 0.5 (as shown in figure 3) at 150lp/mm, the resolution of the lens is enabled to be as high as 800 ten thousand pixels, and the requirement of artificial intelligence logistics high resolution is met; the optical focusing adopts a focusing mode of half group movement, so that high-definition imaging of 200mm object distance is realized, optical distortion is less than 1.3 percent (as shown in figure 4), distortion is reduced in imaging, and the requirement of artificial intelligence on low distortion of logistics is met.
In this embodiment, the mechanical structure of the lens includes a main lens barrel 7, a rear lens group barrel 31 which can move back and forth relative to the main lens barrel is installed in the main lens barrel 7, a front lens group barrel 2 is installed at the front end of the rear lens group barrel 31, a connecting seat 11 is installed at the rear end of the main lens barrel 7, the front lens group a is installed in the front lens group barrel 2, a second cemented group and a biconvex lens B-3 in the rear lens group B are installed in the rear lens group barrel 31, a biconvex lens B-4 in the rear lens group B is installed in the connecting seat 11, and a screw interface 12 connected with a camera is arranged on the periphery of the connecting seat 11; the main lens cone is mainly used for bearing the focusing rotating wheel, the front group lens cone, the rear group lens cone and the connecting seat; in order to prevent the front group and the rear group from rotating axially along the optical axis when the lens is actuated and focused, the main lens cone adopts a symmetrical U-shaped guide groove structure design, and the rear group lens cone is locked and limited in the U-shaped guide grooves at the two sides of the main lens cone through 2 rear group lens cone guide nails, so that the rotational freedom degree of the lens is limited, and the aim of linear motion is fulfilled.
In the embodiment, the bearing surfaces and the threaded holes of the lenses of the front group lens barrel are integrally processed and formed by a turning and milling compound machine, so that the assembly coaxiality and stability of the front group of 3 lenses are ensured; the bearing position of the spacer ring A and the positive crescent-shaped lens 28 is designed into a right angle, so that the air interval between the positive crescent-shaped lens A-1 and the first gluing group is effectively ensured, and the coaxiality of the assembling optical axis of the lens is ensured; the pressing ring A is in threaded fit with the front group of lens barrels, so that the assembly integrity of the front group of lenses and the spacing ring A is effectively ensured; the front group of lens barrel adopts a step surface design, so that the reflection of ineffective light rays is effectively blocked, the effect of eliminating stray light is achieved, and the performance of the lens is improved.
In the embodiment, the rear lens barrel group has the same function as the front lens barrel group, and a spacing ring B is designed to be matched with the rear lens barrel group in order to ensure the air space between the second glue combination group of the rear lens group and the double convex lens B-3; and clamping ring B and rear group lens barrel screw-thread fit, the effectual wholeness of having guaranteed rear group lens and spacer B assembly, the effectual optical axis axiality and the assembly stability of having guaranteed rear group lens assembly.
In the embodiment, the connecting seat has the main functions of bearing the rear group of the positive crescent lenses B-4 and the pressing ring C, the lens bearing surface, the internal and external threads and the nail hole on the inner wall of the connecting seat are all formed by one-step processing of an integrated turn-milling compound machine, the coaxiality of the internal diameter and the external diameter can be accurately ensured, and the integral stability of the lens is improved; after design, the pressing ring is matched with the connecting seat, so that the coaxiality and stability of an optical axis of lens assembly are ensured; in order to enable the lens to be perfectly matched with most industrial cameras on the market, a threaded interface on the connecting seat adopts a mainstream 1-32UNF American fine-tooth threaded interface to play a role in connecting the lens with the camera.
In this embodiment, the front part of the rear group lens barrel 31 is externally sleeved with a focusing rotating wheel 5 in threaded fit with the rear group lens barrel, the focusing rotating wheel 5 is externally sleeved with a focusing ring 6 which synchronously rotates with the focusing rotating wheel 5, and the focusing ring 6 is installed at the front end of the main lens barrel 7 and is in rotating fit with the main lens barrel; the focusing rotating wheel can be driven to perform thread transmission with the rear lens barrel by rotating the focusing ring so as to achieve the aim of horizontally focusing the lens; in order to enhance the practicability of the lens, when the focusing ring is adjusted to the required object distance, the focusing rotating wheel can be tightly locked through the focusing rotating wheel locking nail 24 so as to achieve the use purpose; in order to ensure the accuracy of the focusing precision and the direction of the lens, the main lens cone and the focusing ring are matched to limit by adopting a concave-convex structural design.
In the embodiment, in order to make the lens finer and smaller, the iris diaphragm adopts an embedded diaphragm structure, and the structural design can effectively save the internal space between the front group and the rear group; the variable diaphragm 22 is arranged at the rear end of the front group lens barrel 2, the rear end of the front group lens barrel 2 is also provided with a diaphragm turntable for driving the variable diaphragm to rotate, the periphery of the main lens barrel is provided with a diaphragm adjusting ring 10 which is selectively matched with the main lens barrel, the diaphragm adjusting ring 10 is connected with a rocking handle of the diaphragm turntable through a diaphragm guide nail 9 which passes through the main lens barrel 7, six diaphragm blades are matched with 6 inner holes of the main lens barrel through rivets on one side to act, and the diaphragm turntable is matched with the main lens barrel through a diaphragm clamp spring and plays a role in fixing the diaphragm blades and the diaphragm turntable; in order to meet the requirements of different relative apertures optically; in order to avoid the opening and closing of the iris diaphragm exceeding the optical stroke, a diaphragm limiting groove 8 with a certain angle is arranged on the main lens cone and used for limiting the limit use of the iris diaphragm; in order to enhance the practicability of the lens, when the diaphragm adjusting ring is adjusted to the required aperture position, the diaphragm adjusting ring can be fastened and locked by the diaphragm locking nail 23 so as to achieve the purpose of use.
In this embodiment, the filter 1 is installed inside the front end of the front group lens barrel 2; the size of the filter is M27x0.5, and the filter is mainly used for matching and assembling different filter functions.
The overall dimension of the lens of the utility model is designed to be phi 29mm multiplied by 32.5mm, and the focusing of the lens adopts a half-group movable focusing structure; in order to prevent the front and rear groups from being linked to rotate when the lens is actuated and focused, the main lens cone adopts a symmetrical U-shaped guide groove structure design; in order to improve the light passing effect of the lens, the iris diaphragm is designed into an embedded structure, and the diaphragm blades, the diaphragm turntable and the diaphragm clamp spring are matched with the front group of lens barrels to form an integrated design, so that the internal space of the lens is effectively optimized, and the lens is more exquisite and small; in order to ensure the accuracy of the focusing precision and the direction of the lens, the main lens cone and the focusing ring are matched to limit by adopting a concave-convex structural design; in order to ensure the stability of the matching between each mechanical piece and each lens, the machining drawing carries out strict tolerance control on the hole axis matching dimension, and each part and each optical piece are matched more tightly, so that the reliability of the lens is ensured and the optical design requirement is met; in consideration of the aesthetic property of the industrial lens, the appearance surface of each mechanical part adopts a black-and-elegant sand blasting process, and the overall texture and quality of the lens are further improved.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (5)
1. The utility model provides a low distortion high definition industrial camera lens which characterized in that: the optical system of the lens comprises a front group A with negative focal power, an iris diaphragm and a rear group B with positive focal power, which are sequentially arranged along the incident direction of light rays from front to back, wherein the front group A is sequentially provided with a positive crescent lens A-1, a first adhesive combination tightly connected by the positive crescent lens A-2 and a negative crescent lens A-3 from front to back, and the rear group B is sequentially provided with a second adhesive combination tightly connected by the negative crescent lens B-1 and a positive crescent lens B-2 from front to back, a double convex lens B-3 and a double convex lens B-4; the air space between the lenticular lens B-3 and the lenticular lens B-4 is adjustable.
2. The lens for low-distortion high-definition industry of claim 1, wherein: the air space between the positive crescent lens 28 and the first adhesive group is 0.10mm, the air space between the front group a and the iris diaphragm is 4.40mm, the air space between the iris diaphragm and the rear group B is 2.8mm, the air space between the second adhesive group and the biconvex lens B-3 is 0.10mm, and the air space between the biconvex lens B-3 and the biconvex lens B-4 is 1.50-4.50 mm.
3. The lens for low-distortion high-definition industry of claim 1, wherein: the mechanical structure of the lens comprises a main lens cone, a rear group lens cone which can move back and forth relative to the main lens cone is installed in the main lens cone, a front group lens cone is installed at the front end of the rear group lens cone, a connecting seat is installed at the rear end of the main lens cone, a front group A is installed in the front group lens cone, a second gluing group and a double-convex lens B-3 in the rear group B are installed in the rear group lens cone, a double-convex lens B-4 in the rear group B is installed in the connecting seat, and a threaded interface connected with a camera is arranged on the periphery of the connecting seat.
4. The lens for low-distortion high-definition industry of claim 3, wherein: the front part of the rear group of lens barrels is sleeved with a focusing rotating wheel in threaded fit with the rear group of lens barrels, the focusing rotating wheel is sleeved with a focusing ring synchronously rotating with the focusing rotating wheel, and the focusing ring is arranged at the front end of the main lens barrel and is in rotating fit with the main lens barrel.
5. The lens for low-distortion high-definition industry of claim 4, wherein: the iris diaphragm is arranged at the rear end of the front group lens cone, the rear end of the front group lens cone is also provided with a diaphragm turntable used for driving the iris diaphragm to rotate, the periphery of the main lens cone is provided with a diaphragm adjusting ring which is selectively matched with the main lens cone, and the diaphragm adjusting ring is connected with a rocking handle of the diaphragm turntable through a diaphragm guide pin which penetrates through the main lens cone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921256436.1U CN210514763U (en) | 2019-08-06 | 2019-08-06 | Low-distortion high-definition industrial lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921256436.1U CN210514763U (en) | 2019-08-06 | 2019-08-06 | Low-distortion high-definition industrial lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488458A (en) * | 2019-08-06 | 2019-11-22 | 福建福光天瞳光学有限公司 | The industrial camera lens of the low distortion high definition of one kind and its working method |
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2019
- 2019-08-06 CN CN201921256436.1U patent/CN210514763U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488458A (en) * | 2019-08-06 | 2019-11-22 | 福建福光天瞳光学有限公司 | The industrial camera lens of the low distortion high definition of one kind and its working method |
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