CN219456613U - Low-distortion large-target-surface lens for industrial line scanning - Google Patents
Low-distortion large-target-surface lens for industrial line scanning Download PDFInfo
- Publication number
- CN219456613U CN219456613U CN202320152669.7U CN202320152669U CN219456613U CN 219456613 U CN219456613 U CN 219456613U CN 202320152669 U CN202320152669 U CN 202320152669U CN 219456613 U CN219456613 U CN 219456613U
- Authority
- CN
- China
- Prior art keywords
- lens
- cemented
- group
- lens group
- focal length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Lenses (AREA)
Abstract
The utility model relates to a large target surface lens with low distortion for industrial line scanning, an optical system of the lens comprises a front lens group A, a diaphragm, a rear lens group B and a rear lens group C, wherein the front lens group A comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the third lens and the fourth lens are closely connected to form a first cemented lens group, and the fifth lens and the sixth lens are closely connected to form a second cemented lens group; the rear lens group B comprises a seventh lens, an eighth lens and a ninth lens, the seventh lens and the eighth lens are closely connected to form a third cemented lens group, the rear lens group C comprises a tenth lens, an eleventh lens and a twelfth lens, the tenth lens and the eleventh lens are closely connected to form a fourth cemented lens group, the focal length of the optical system is f, the focal length of the first cemented lens group is f1, the focal length of the second cemented lens group is f2, the focal length of the third cemented lens group is f3, and the focal length of the fourth cemented lens group is f4, so that the following relations are satisfied: 1< |f1/f| <2,0.5< |f2/f| <1, 10< |f3/f| <16,1< |f4/f| <2.
Description
Technical Field
The utility model relates to the field of optical lenses, in particular to a large target surface lens with low distortion for industrial line scanning.
Background
Machine vision is the measurement and judgment of using a machine instead of a human eye. Currently, line scan lenses are an important component of many machine vision systems. In precision detection applications such as electronic manufacturing, liquid crystal display size measurement and circuit board pin detection, a linear scanning lens is often adopted to be matched with a linear array camera to acquire an image, and clear and accurate acquisition of a real image through the lens is the basis of subsequent image analysis and processing. The line scanning lens in the current market has poor and satisfactory imaging definition and distortion rate, and cannot meet the application requirements of the day-to-day and month-to-day times on high resolution, large target surface, low distortion and the like.
Disclosure of Invention
First, the technical problem to be solved
In order to solve the problems in the prior art, the utility model provides the large target surface lens with low distortion for industrial line scanning, which has the performances of high resolution, large target surface and low distortion and meets the requirements of high-end products.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps: the optical system of the lens comprises a front lens group A, a diaphragm, a rear lens group B and a rear lens group C which are sequentially arranged from front to back along the light incidence direction, wherein the front lens group A comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from front to back along the light incidence direction, the third lens and the fourth lens are closely connected to form a first cemented lens group, and the fifth lens and the sixth lens are closely connected to form a second cemented lens group; the front end surfaces of the first lens, the second lens, the third lens and the fifth lens are convex, and the rear end surfaces of the fourth lens and the sixth lens are concave;
the rear lens group B comprises a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from front to back along the incidence direction of light rays, the seventh lens and the eighth lens are closely connected to form a third cemented lens group, the front end face of the seventh lens is a concave face, the rear end face of the eighth lens is a convex face, and at least one convex face is arranged in the front end face and the rear end face of the ninth lens;
the rear lens group C comprises a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged from front to back along the incidence direction of light rays, the tenth lens and the eleventh lens are closely connected to form a fourth cemented lens group, the front end face of the tenth lens and the rear end face of the eleventh lens are both concave surfaces, and the rear end face of the twelfth lens is a convex surface;
at least two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens have positive focal power, at least one of the seventh lens and the eighth lens has negative focal power, and the ninth lens has positive focal power;
at least one of the tenth lens, the eleventh lens and the twelfth lens has positive focal power;
the focal length of the optical system is f, the focal length of the first cemented lens group is f1, the focal length of the second cemented lens group is f2, the focal length of the third cemented lens group is f3, the focal length of the fourth cemented lens group is f4, and the following relationships are satisfied between the focal lengths: 1< |f1/f| <2,0.5< |f2/f| <1, 10< |f3/f| <16,1< |f4/f| <2.
Further, the first lens has positive optical power.
Further, the third lens in the first cemented lens group has negative optical power and the fourth lens has positive optical power.
Further, the fifth lens has positive optical power, and the sixth lens has negative optical power.
Further, the seventh lens in the third cemented lens group has negative optical power, and the eighth lens has positive optical power.
Further, the tenth lens in the fourth cemented lens group has positive optical power, and the eleventh lens has negative optical power.
Further, the twelfth lens has positive optical power.
Further: a distance L from a front surface vertex of the first lens to a rear surface vertex of the twelfth lens satisfies a relation with a focal length f of the optical system: 0.5< |L/f| < 1.
Further: the optical back intercept BFL of the optical system and the focal length f of the optical system satisfy the relationship: 0.5< |BFL/f| < 1.
The half image height y' of the optical system and the focal length f of the optical system satisfy the relation: y'/f < 0.5.
(III) beneficial effects
The beneficial effects of the utility model are as follows: the F number of the image space obtained based on the lens structure of the scheme is 3.8, the maximum imaging surface is phi 62mm, the resolution can reach 100lp/mm, the maximum optical distortion of the whole field of view is lower than 0.026%, the lens structure has the performances of high resolution, large target surface and low distortion, the requirements of high-end products are met, and the clear aperture can be flexibly adjusted by adopting a whole group of focusing modes.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of an optical system according to an embodiment of the present utility model;
FIG. 3 is a graph of distortion of an optical system in an embodiment of the utility model;
[ reference numerals description ]
L1, a first lens; l2, a second lens; l3, a third lens; l4, a fourth lens; l5, a fifth lens; l6, sixth lens; l7, seventh lens; l8, eighth lens; l9, ninth lens; l10, a tenth lens; l11, eleventh lens; l12, twelfth lens;
u1, a first cemented lens group; u2, a second cemented lens group; u3, a third cemented lens group; u4, a fourth cemented lens group;
STO and diaphragm;
l, the distance from the vertex of the front surface of the first lens to the vertex of the rear surface of the twelfth lens;
BFL, optical back intercept of the optical system.
Detailed Description
The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings.
Example 1
Referring to fig. 1 to 3, an optical system of a lens for an industrial line scanning low distortion large target surface lens includes a front lens group a, a stop STO, a rear lens group B and a rear lens group C sequentially arranged from front to back along a light incidence direction, wherein the front lens group a includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 sequentially arranged from front to back along the light incidence direction, the third lens L3 and the fourth lens L4 are closely connected to form a first cemented lens group U1, and the fifth lens L5 and the sixth lens L6 are closely connected to form a second cemented lens group U2; the front end surfaces of the first lens L1, the second lens L2, the third lens L3 and the fifth lens L5 are all convex surfaces, and the rear end surfaces of the fourth lens L4 and the sixth lens L6 are all concave surfaces;
the rear lens group B comprises a seventh lens L7, an eighth lens L8 and a ninth lens L9 which are sequentially arranged from front to back along the incidence direction of light rays, the seventh lens L7 and the eighth lens L8 are closely connected to form a third cemented lens group U3, the front end face of the seventh lens L7 is a concave face, the rear end face of the eighth lens L8 is a convex face, and at least one convex face is arranged in the front end face and the rear end face of the ninth lens L9;
the rear lens group C comprises a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 which are sequentially arranged from front to back along the incidence direction of light rays, the tenth lens L10 and the eleventh lens L11 are closely connected to form a fourth cemented lens group U4, the front end face of the tenth lens L10 and the rear end face of the eleventh lens L11 are both concave surfaces, and the rear end face of the twelfth lens L12 is a convex surface;
at least two of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 have positive focal power, at least one of the seventh lens L7 and the eighth lens L8 has negative focal power, and the ninth lens L9 has positive focal power;
at least one of the tenth lens L10, the eleventh lens L11, and the twelfth lens L12 has positive optical power;
the focal length of the optical system is f, the focal length of the first cemented lens group U1 is f1, the focal length of the second cemented lens group U2 is f2, the focal length of the third cemented lens group U3 is f3, the focal length of the fourth cemented lens group U4 is f4, and the following relationships are simultaneously satisfied between the focal lengths: 1< |f1/f| <2,0.5< |f2/f| <1, 10< |f3/f| <16,1< |f4/f| <2.
Preferably, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, and the twelfth lens L12 are spherical mirrors.
Preferably, the first lens L1 has positive optical power.
Preferably, the third lens L3 in the first cemented lens group U1 has negative optical power, and the fourth lens L4 has positive optical power.
Preferably, the rear end face of the third lens L3 in the first cemented lens group U1 is concave, and the front end face of the fourth lens L4 is convex.
Preferably, the fifth lens L5 has positive optical power, and the sixth lens L6 has negative optical power.
Preferably, the rear end face of the fifth lens L5 in the second cemented lens group U2 is concave, and the front end face of the sixth lens L6 is convex.
Preferably, the seventh lens L7 in the third cemented lens group U3 has negative power, and the eighth lens L8 has positive power.
Preferably, the rear end face of the seventh lens L7 in the third cemented lens group U3 is concave, and the front end face of the eighth lens L8 is convex.
Preferably, the tenth lens L10 in the fourth cemented lens group U4 has positive optical power, and the eleventh lens L11 has negative optical power.
Preferably, the rear end face of the tenth lens L10 in the fourth cemented lens group U4 is convex; the front end face of the eleventh lens L11 is a concave surface.
Preferably, the twelfth lens L12 has positive optical power.
Preferably: the distance L from the front surface vertex of the first lens L1 to the rear surface vertex of the twelfth lens L12 satisfies the relation with the focal length f of the optical system: 0.5< |L/f| < 1.
Preferably: the optical back intercept BFL of the optical system and the focal length f of the optical system satisfy the relationship: 0.5< |BFL/f| < 1.
The half image height y' of the optical system and the focal length f of the optical system satisfy the relation: y'/f < 0.5.
In this example, the optical system data is as follows:
in this example, the focal length F of the optical system is 98mm, the maximum aperture is f# =3.8, the focal length f1= 195.0mm of the first cemented lens group U1, the focal length f2= -81.9mm of the second cemented lens group U2, the focal length f3= 1447.2mm of the third cemented lens group U3, the focal length f4= 121.4mm of the fourth cemented lens group U4, the distance l=84.9 mm from the front surface vertex of the first lens L1 to the rear surface vertex of the twelfth lens L12, the optical back focal length bfl=74.2 mm, the half image height y' =31.62 mm, the focal length f1=146.3 mm of the first cemented lens L1, the focal length f2=164.8 mm of the second cemented lens L2, the focal length f3= -91.9mm of the third cemented lens L3, the focal length f4= 147.5mm of the fourth cemented lens group U4, the focal length l5= 78.5mm, the focal length f6.6 mm of the seventh lens l= 7.7 mm, the focal length f7.7 mm of the eighth lens L10.7 mm, the focal length 7.7 mm of the eighth cemented lens L8.7 mm, the focal length L1= 8.7.7 mm, the focal length 7.7 mm of the eighth lens L8 mm.
Each relation: |f1/f|=1.99; |f2/f|=0.83; |f3/f|=11.69; |f4/f|=1.24; l/f|=0.87; BFL/f|=0.76; y'/f|=0.33;
the relation is satisfied: 1< |f1/f| <2;0.5< |f2/f| <1;10< |f3/f| <16;1< |f4/f| <2;0.5< |L/f| <1; 0.5< |BFL/f| <1; y'/f < 0.55.
The embodiment of the utility model is tested to obtain fig. 2 and 3, fig. 2 is a light path diagram of the optical system in the embodiment of the utility model, and fig. 3 is an optical distortion graph of the embodiment, and it can be seen from fig. 3 that the maximum optical distortion in the full field of view is lower than 0.026%.
The structure of the utility model realizes the optical system of the line scanning machine vision lens with the focal length of 98mm, the F number of an image space is 3.8, the maximum imaging surface is phi 62mm, the resolution can reach 100lp/mm, the maximum optical distortion of the whole field of view is lower than 0.026 percent, the high-resolution, large target surface and low distortion performance are realized, the requirements of high-end products are met, and the clear aperture can be flexibly adjusted by adopting a whole group of focusing modes.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (10)
1. The optical system of the lens comprises a front lens group A, a diaphragm, a rear lens group B and a rear lens group C which are sequentially arranged from front to back along the light incidence direction, and is characterized in that the front lens group A comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from front to back along the light incidence direction, the third lens and the fourth lens are closely connected to form a first cemented lens group, and the fifth lens and the sixth lens are closely connected to form a second cemented lens group; the front end surfaces of the first lens, the second lens, the third lens and the fifth lens are convex, and the rear end surfaces of the fourth lens and the sixth lens are concave;
the rear lens group B comprises a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from front to back along the incidence direction of light rays, the seventh lens and the eighth lens are closely connected to form a third cemented lens group, the front end face of the seventh lens is a concave face, the rear end face of the eighth lens is a convex face, and at least one convex face is arranged in the front end face and the rear end face of the ninth lens;
the rear lens group C comprises a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged from front to back along the incidence direction of light rays, the tenth lens and the eleventh lens are closely connected to form a fourth cemented lens group, the front end face of the tenth lens and the rear end face of the eleventh lens are both concave surfaces, and the rear end face of the twelfth lens is a convex surface;
at least two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens have positive focal power, at least one of the seventh lens and the eighth lens has negative focal power, and the ninth lens has positive focal power;
at least one of the tenth lens, the eleventh lens and the twelfth lens has positive focal power;
the focal length of the optical system is f, the focal length of the first cemented lens group is f1, the focal length of the second cemented lens group is f2, the focal length of the third cemented lens group is f3, the focal length of the fourth cemented lens group is f4, and the following relationships are satisfied between the focal lengths: 1< |f1/f| <2,0.5< |f2/f| <1, 10< |f3/f| <16,1< |f4/f| <2.
2. The large target surface lens for industrial wire sweep of claim 1, wherein the first lens has positive optical power.
3. The large target surface lens for industrial wire sweep of claim 1, wherein the third lens in the first cemented lens group has negative optical power and the fourth lens has positive optical power.
4. The large target surface lens for industrial wire sweep of claim 1, wherein the fifth lens has positive optical power and the sixth lens has negative optical power.
5. The large target surface lens for industrial wire sweep of claim 1, wherein the seventh lens in the third cemented lens group has negative optical power and the eighth lens has positive optical power.
6. The large target surface lens for industrial wire sweep of claim 1, wherein the tenth lens in the fourth cemented lens group has positive optical power and the eleventh lens has negative optical power.
7. The large target surface lens for industrial wire sweep of claim 1, wherein the twelfth lens has positive optical power.
8. The large target surface lens for industrial wire sweep low distortion according to claim 1, wherein: a distance L from a front surface vertex of the first lens to a rear surface vertex of the twelfth lens satisfies a relation with a focal length f of the optical system: 0.5< |L/f| < 1.
9. The large target surface lens for industrial wire sweep low distortion according to claim 1 or 8, wherein: the optical back intercept BFL of the optical system and the focal length f of the optical system satisfy the relationship: 0.5< |BFL/f| < 1.
10. The large target surface lens for industrial line sweep low distortion according to claim 1, the half image height y' of the optical system and the focal length f of the optical system satisfy the relation: y'/f < 0.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320152669.7U CN219456613U (en) | 2023-02-03 | 2023-02-03 | Low-distortion large-target-surface lens for industrial line scanning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320152669.7U CN219456613U (en) | 2023-02-03 | 2023-02-03 | Low-distortion large-target-surface lens for industrial line scanning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219456613U true CN219456613U (en) | 2023-08-01 |
Family
ID=87387807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320152669.7U Active CN219456613U (en) | 2023-02-03 | 2023-02-03 | Low-distortion large-target-surface lens for industrial line scanning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219456613U (en) |
-
2023
- 2023-02-03 CN CN202320152669.7U patent/CN219456613U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103685886B (en) | Image capture system and imaging optical system | |
| CN108594401B (en) | Large target surface fixed focus machine vision linear array lens | |
| CN109991724A (en) | A kind of doubly telecentric fixed-focus optical system | |
| CN109975962A (en) | A kind of bilateral telecentric optical system with long reach | |
| CN111580245A (en) | High-resolution Samm lens | |
| CN108681036B (en) | 35mm large target surface machine vision line scanning lens | |
| CN212302042U (en) | Large-view-field optical lens | |
| CN116449538B (en) | Optical lens and camera module | |
| CN219456613U (en) | Low-distortion large-target-surface lens for industrial line scanning | |
| CN110426824B (en) | Face recognition optical lens | |
| CN210690925U (en) | Face recognition optical lens | |
| CN109100856B (en) | High-resolution large-target-surface-magnification-adjustable line-scanning machine vision lens | |
| CN218213592U (en) | Industrial lens and near-to-eye display system detection device | |
| CN116243461A (en) | Low-distortion large-target-surface lens for industrial line scanning | |
| CN219871926U (en) | Large target surface lens for industrial line scanning | |
| CN114647068B (en) | Optical system | |
| CN113820828B (en) | High-resolution fixed-focus lens | |
| CN113900239B (en) | Wide-angle large-area array starlight-level optical variable-pitch image detection lens | |
| CN116243462A (en) | Large target surface lens for industrial line scanning | |
| EP4006610A1 (en) | Optical lens, camera module and terminal | |
| CN210348043U (en) | Low-distortion line scanning lens | |
| CN215264199U (en) | Large target surface sweeping lens | |
| CN209690607U (en) | A kind of small-size long working distance from object space telecentric optical system | |
| CN104932083A (en) | Large-area array dynamic monitoring and measuring camera optical system | |
| CN218158533U (en) | Optical lens system and monitoring camera equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |