CN219957966U - Double telecentric vision detection lens - Google Patents
Double telecentric vision detection lens Download PDFInfo
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- CN219957966U CN219957966U CN202321003873.9U CN202321003873U CN219957966U CN 219957966 U CN219957966 U CN 219957966U CN 202321003873 U CN202321003873 U CN 202321003873U CN 219957966 U CN219957966 U CN 219957966U
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000007689 inspection Methods 0.000 claims description 11
- 238000005286 illumination Methods 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 238000006467 substitution reaction Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000005308 flint glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of detection lenses and discloses a double-telecentric vision detection lens, which comprises a diaphragm and an image surface, wherein a first lens group is arranged on the left side of the diaphragm, a first lens, a second lens and a third lens are sequentially arranged on the first lens group from left to right, the first lens is of a biconvex structure, the focal length is positive, the second lens is of a biconvex structure, the focal length is positive, the third lens is of a biconcave structure, the focal length is negative, a second lens group is arranged between the diaphragm and the image surface, a fourth lens, a fifth lens and a sixth lens are sequentially arranged on the second lens group from left to right, the fourth lens is of a biconcave structure, the focal length is positive, the fifth lens is negative, the sixth lens is of a biconvex structure, the focal length is positive, the second lens and the third lens are cemented lenses, and the fourth lens and the fifth lens are cemented lenses. The lens has good tolerance, simple structure and low cost.
Description
Technical Field
The utility model relates to the technical field of detection lenses, in particular to a double telecentric vision detection lens.
Background
At present, the automation development of the machine is rapid, and the industrial vision is the basis of the industrial automation and is the 'eye' of the machine. Machine vision is to replace human eyes with computer vision to perform detection work of various quality, safety and integrity, such as positioning, identification, measurement, inspection and the like; is generally used in automatic detection, workpiece processing and assembly automation and production processes. The whole industrial vision system consists of a sensor, a camera, a lens, a man-machine interface, a vision processor, a light source system, vision software and network connection. Wherein the camera is an important optical accessory that determines the detection accuracy.
At present, the existing visual inspection lens is often expensive to counterfeit, has a complex structure, and too many lens lenses also put high requirements on the assembly concentricity of the lenses. In the mass production process, various problems such as large imaging consistency deviation, unstable lens distortion focal depth and the like exist.
Accordingly, based on the above technical problems, it is necessary for those skilled in the art to develop a dual telecentric vision inspection lens.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a double telecentric vision detection lens.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides a double telecentric vision inspection lens technical scheme, includes diaphragm and image plane, diaphragm left side is equipped with lens group one, lens group one is equipped with first lens, second lens and third lens from left to right in proper order, first lens is the biconvex structure and the focus is positive, second lens is the biconvex structure and the focus is positive the third lens is biconcave structure and the focus is negative, be equipped with lens group two between diaphragm and the image plane, lens group two is equipped with fourth lens, fifth lens and sixth lens from left to right in proper order, fourth lens is biconcave structure and the focus is positive, fifth lens is biconcave structure and the focus is negative, sixth lens is biconvex structure and the focus is positive, wherein second lens, third lens are the cemented lens, wherein fourth lens, fifth lens are cemented lens.
Preferably, the imaging illumination lens satisfies the following conditional expression: f is more than or equal to 0.001 1 /F≤0.02、0.001≤F 2 F is less than or equal to 0.02, wherein F 2 Is to detect a focal length of a lens group of a lens, F 2 The focal length of the lens group II of the detection lens, F is the focal length, and the focal lengths of the lens group I and the lens group II and the focal length of the double telecentric vision detection lens satisfy F 1 /F＝0.0032，F 2 /F＝0.0032。
Preferably, the radii of curvature of the two sides of the first lens are R 1 = 215.131mm and R 2 -48.98mm, the first lens having a central thickness d 1 4.3mm;
the curvature radius of the two sides of the second lens is R respectively 3 =34 mm and R 4 -46.77mm, the second lens having a central thickness d 3 6mm;
the curvature radius of the two sides of the third lens is R respectively 4 = -46.77mm and R 5 =60 mm, the center thickness d of the third lens 4 Is 2mm;
the curvature radius of the front side and the back side of the fourth lens is R respectively 6 = 32.257mm and R 7 -47.64mm, the center thickness d of the fourth lens 7 3mm;
the radius of curvature of the front side and the rear side of the fifth lens is R respectively 7 = -47.64mm and R 8 =19.47 mm, the center thickness d of the fifth lens 8 2.5mm;
the radius of curvature of the front side and the rear side of the sixth lens is R respectively 9 =27.9 mm and R 10 -135.83mm, the center thickness d of the sixth lens 10 Is 4mm.
Preferably, the first lens material is ZF2, the second lens material is K9, the third lens material is ZF6, the fourth lens material is K9, the fifth lens material is ZF2, and the sixth lens material is ZF2.
Preferably, the diaphragm is positioned between the first lens group and the second lens group, and the lens f/7-f/22 can be adjusted.
Preferably, air is between the first lens and the second lensGap d 2 An air gap d between the third lens and the diaphragm of =0.6mm 5 An air gap d between the diaphragm and the fourth lens of =42.3 mm 6 An air gap d between the fifth lens and the sixth lens of =29 mm 9 An air gap d between the sixth lens and the image plane of =16.2 mm 11 ＝22.97mm。
Preferably, the diaphragm can be replaced by a 45-degree beam combining prism to realize coaxial illumination, the beam combining prism is 9mm by 9mm cube, and the prism is made of K9 optical glass.
Preferably, the incident light beam has a wavelength of 425nm to 675nm.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model relates to a double telecentric vision detection lens, which has working wavelength of 425nm-675nm, corrects chromatic aberration through crown flint glass gluing, realizes 1X imaging by the lens, has an observation distance of 113mm, a maximum object space observation range of 8.8X6.6mm, is maximally matched with 2/3 inch of CCD, has object image telecentricity of <0.25 DEG, lens distortion of <0.03%, can realize high-precision detection, optimizes the optical structure of the lens, reduces the number of lenses to a six-piece structure, reduces the tolerance requirement of the lens by using a symmetrical gluing structure, can be independently used as an illumination projection lens to realize coaxial illumination, and has simple structure, good tolerance and low processing and manufacturing cost.
Drawings
Fig. 1 is a schematic structural diagram based on an embodiment of the present utility model.
Fig. 2 is a schematic structural diagram of a beam combining prism based on the present utility model to replace a diaphragm.
FIG. 3 is a schematic view of an optical path based on an embodiment of the present utility model
Fig. 4 is an MTF curve of an embodiment of the present utility model.
Fig. 5 is a spot diagram of an embodiment of the present utility model.
Fig. 6 is a distortion and field curvature diagram of an embodiment of the present utility model.
Reference numerals: 1. a first lens group; 11. a first lens; 12. a second lens; 13. a third lens; 2. a second lens group; 21. a fourth lens; 22. a fifth lens; 23. a sixth lens; 3. a diaphragm; 4. an image plane.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced otherwise than as described herein, and therefore the present utility model is not limited to the specific embodiments of the disclosure that follow.
Examples
The present utility model is described in further detail below by way of examples to enable those skilled in the art to practice the same by reference to the specification.
The case where the focal length and the radius of curvature are negative means that the direction thereof is opposite to the case where the focal length and the radius of curvature are positive.
Referring to fig. 1-6, the present utility model provides a technical solution for a double telecentric vision inspection lens: the lens group I1 is arranged on the left side of the diaphragm 3, the first lens 11, the second lens 12 and the third lens 13 are sequentially arranged on the lens group I1 from left to right, the first lens 11 is of a biconvex structure, the focal length is positive, the second lens 12 is of a biconvex structure, the focal length is positive, the third lens 13 is of a biconcave structure, the focal length is negative, the lens group II 2 is arranged between the diaphragm 3 and the image surface 4, the fourth lens 21, the fifth lens 22 and the sixth lens 23 are sequentially arranged on the lens group II 2 from left to right, the fourth lens 21 is of a biconvex structure, the focal length is positive, the fifth lens 22 is of a biconcave structure, the focal length is negative, the sixth lens 23 is of a biconvex structure, the second lens 12 and the third lens 13 are cemented lenses, and the fourth lens 21 and the fifth lens 22 are cemented lenses.
Further, the imaging illumination lens satisfies the following conditional expression: f is more than or equal to 0.001 1 /F≤0.02、0.001≤F 2 F is less than or equal to 0.02, wherein F 1 F is 1 focus of the lens group of the inspection lens，F 2 and/F is the focal length of the lens group II 2 of the detection lens, and F is the focal length.
Furthermore, the diaphragm 3 can be replaced by a 45-degree beam combining prism to realize coaxial illumination.
Further, the radii of curvature of the front and rear sides of the first lens 11 are R 1 = 215.131mm and R 2 = -48.98mm, center thickness d of first lens 11 1 4.3mm. The radius of curvature of the front and rear sides of the second lens 12 is R 3 =34.9 mm and R 4 -46.2mm, center thickness d of second lens 12 3 6mm. The radius of curvature of the front and rear sides of the third lens 13 is R 4 = -46.2mm and R 5 The center thickness d of the third lens 13 =60 mm 4 Is 2mm. The front and rear sides of the fourth lens 21 have radii of curvature R 6 = 32.257mm and R 7 = -47.3mm, center thickness d of fourth lens 21 6 Is 3mm. The front and rear sides of the fifth lens 22 have radii of curvature R 7 = -47.3mm and R 8 Center thickness d of fifth lens 22 =19.47 mm 7 Is 2.6mm. The radius of curvature of the front and rear sides of the sixth lens 23 is R 9 = -27.9mm and R 10 = 135.83mm, center thickness d of sixth lens 23 9 Is 4mm. The first lens 11 is ZF2, the second lens 12 is K9, the third lens 13 is ZF6, the fourth lens 21 is K9, the fifth lens 22 is ZF2, and the sixth lens6 is ZF2. An air gap d between the first lens 11 and the second lens 12 2 The second lens 12 and the third lens 13 are cemented lenses, and an air gap d is formed between the third lens 13 and the beam combining prism 5 The beam combining prism dimensions 9mm x 9mm, material K9, air gap d between the beam combining prism and the fourth lens 21 =42 mm 6 The fourth lens 21 and the fifth lens 22 of =32 mm are cemented lenses, and an air gap d is formed between the fifth lens 22 and the sixth lens 23 9 ＝16.2mm。
For specific parameters reference is made to the following table: table 1 shows the shortest focal length status data
| Spherical surface | Radius of curvature R (mm) | Air gap d (mm) | Nd of material Vd |
| R1 | 215.131 | d 1 ＝4.3 | ZF2 |
| R2 | -48.98 | d 2 ＝0.5 | K9 |
| R3 | 34.9 | d 3 ＝6 | |
| R4 | -46.2 | d 4 ＝2 | ZF6 |
| R5 | 60 | d 5 ＝42 | |
| Beam combining prism | ∞ | d＝9 | K9 |
| Beam combining prism | ∞ | d 6 ＝32 | |
| R6 | 32.257 | d 7 ＝3 | K9 |
| R7 | -47.3 | d 8 ＝2.5 | ZF2 |
| R8 | 19.47 | d 9 ＝16.2 | |
| R9 | -27.9 | d 10 ＝4 | ZF2 |
| R10 | 135.83 | d 11 ＝22.97 |
TABLE 1
Other parameters corresponding to the design of the above embodiment are as follows:
the NA of the object space is 0.05, lambda=425 nm-675nm, the field of view of the object space is 8.8mm, 6.6mm, the maximum adaptation of the CCD is 2/3 inch, the telecentricity of the object image is less than 0.25 degrees, and the distortion of the lens is less than 0.03 percent.
F 1 /F＝0.0032，F 2 F=0.0032, wherein F 1 Is a lens group of a detection lens with 1 focal length, F 2 Is the focal length of the lens group II 2 of the detection lens.
The utility model optimizes the optical structure of the lens, reduces the number of lenses into six structures, reduces the tolerance requirement of the lens by using a symmetrical gluing structure, and can be independently used as an illumination projection lens for realizing coaxial illumination, and has the advantages of simple structure, good tolerance and low processing and manufacturing cost.
Although embodiments of the present utility model have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the utility model is suited, and further modifications may be readily made by one skilled in the art, and the utility model is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof. The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
In the description of the present utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a double telecentric vision detects camera lens, includes diaphragm (3) and image plane (4), its characterized in that, diaphragm (3) left side is equipped with lens group one (1), lens group one (1) is equipped with first lens (11), second lens (12) and third lens (13) from left to right in proper order, first lens (11) are the biconvex structure and the focus is positive second lens (12) are biconvex structure and the focus is positive third lens (13) are biconcave structure and the focus is negative, be equipped with lens group two (2) between diaphragm (3) and image plane (4), lens group two (2) are equipped with fourth lens (21), fifth lens (22) and sixth lens (23) from left to right in proper order, fourth lens (21) are biconvex structure and the focus is positive fifth lens (22) are biconcave structure and the focus is negative, sixth lens (23) are biconvex structure and are positive, wherein second lens (12), third lens (22) are cemented lens (22), fourth lens (22).
2. The dual telecentric vision inspection lens of claim 1, wherein: the lens satisfies the following conditional expression: f is more than or equal to 0.001 1 /F≤0.02、0.001≤F 2 F is less than or equal to 0.02, wherein F 1 F is the focal length of lens group one (1) of the detection lens, F 2 and/F is the focal length of the lens group II (2) of the detection lens, and F is the focal length.
3. The dual telecentric vision inspection lens of claim 1, wherein: the curvature radius of the two sides of the first lens (11) is R respectively 1 = 215.131mm and R 2 -48.98mm, the central thickness d of the first lens (11) 1 4.3mm;
the curvature radius of the two sides of the second lens (12) is R respectively 3 =34 mm and R 4 -46.77mm, the central thickness d of the second lens (12) 3 6mm;
the curvature radius of the two sides of the third lens (13) is R respectively 4 = -46.77mm and R 5 =60 mm, the center thickness d of the third lens (13) 4 Is 2mm;
the curvature radius of the front side and the back side of the fourth lens (21) is R respectively 6 = 32.257mm and R 7 -47.64mm, a central thickness d of the fourth lens (21) 7 3mm;
the radius of curvature of the front and rear sides of the fifth lens (22) is R 7 = -47.64mm and R 8 =19.47 mm, the center thickness d of the fifth lens (22) 8 2.5mm;
the radius of curvature of the front and rear sides of the sixth lens (23) is R 9 =27.9 mm and R 10 -135.83mm, the center thickness d of the sixth lens (23) 10 Is 4mm.
4. The dual telecentric vision inspection lens of claim 1, wherein: the first lens (11) is made of ZF2, the second lens (12) is made of K9, the third lens (13) is made of ZF6, the fourth lens (21) is made of K9, the fifth lens (22) is made of ZF2, and the sixth lens (23) is made of ZF2.
5. The dual telecentric vision inspection lens of claim 1, wherein: the diaphragm (3) is positioned between the first lens group (1) and the second lens group (2), and the adjustable lens f/7-f/22 can be realized.
6. The dual telecentric vision inspection lens of claim 1, wherein: an air gap d between the first lens (11) and the second lens (12) 2 An air gap d between the third lens (13) and the diaphragm (3) =0.6 mm 5 An air gap d between the diaphragm (3) and the fourth lens (21) =42.3 mm 6 =29 mm, an air gap d between the fifth lens (22) and the sixth lens (23) 9 =16.2 mm, an air gap d between the sixth lens (23) and the image plane (4) 11 ＝22.97mm。
7. The dual telecentric vision inspection lens of claim 1, wherein: the diaphragm (3) can be replaced by a 45-degree beam combining prism to realize coaxial illumination.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321003873.9U CN219957966U (en) | 2023-04-28 | 2023-04-28 | Double telecentric vision detection lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321003873.9U CN219957966U (en) | 2023-04-28 | 2023-04-28 | Double telecentric vision detection lens |
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| CN219957966U true CN219957966U (en) | 2023-11-03 |
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| CN202321003873.9U Active CN219957966U (en) | 2023-04-28 | 2023-04-28 | Double telecentric vision detection lens |
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