CN109164562A - A fixed focus line scan machine vision lens with adjustable magnification for long working distance - Google Patents
A fixed focus line scan machine vision lens with adjustable magnification for long working distance Download PDFInfo
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- CN109164562A CN109164562A CN201811305209.3A CN201811305209A CN109164562A CN 109164562 A CN109164562 A CN 109164562A CN 201811305209 A CN201811305209 A CN 201811305209A CN 109164562 A CN109164562 A CN 109164562A
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
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Abstract
本发明公开了一种长工作距离倍率可调的定焦线扫机器视觉镜头，包括第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜和第七透镜，所述第一透镜、第四透镜和第七透镜具有正光焦度和弯月结构，所述第二透镜具有正光焦度和双凸结构，所述第三透镜具有负光焦度和双凹结构，所述第五透镜和第六透镜具有负光焦度和弯月结构，本发明提供了高分辨大靶面，放大倍率可调，低畸变，能够与7μm大小的像元尺寸相匹配的高分辨线扫机器视觉镜头光学系统，实现了焦距为100mm的长工作距离倍率可调的定焦线扫机器视觉镜头。
The present invention discloses a fixed-focus line-scan machine vision lens with adjustable magnification over a long working distance, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the first lens, the fourth lens and the seventh lens have positive focal length and a meniscus structure, the second lens has positive focal length and a biconvex structure, the third lens has negative focal length and a biconcave structure, the fifth lens and the sixth lens have negative focal length and a meniscus structure. The present invention provides a high-resolution line-scan machine vision lens optical system with a large target surface, adjustable magnification, low distortion, and the ability to match a pixel size of 7 μm, thereby realizing a fixed-focus line-scan machine vision lens with a long working distance and adjustable magnification and a focal length of 100 mm.
Description
Technical field
The present invention relates to machine visual lens technical fields, and in particular to a kind of adjustable fixed-focus line of long reach multiplying power
Sweep machine visual lens.
Background technique
The effect of NI Vision Builder for Automated Inspection is to measure target part using machine, judgment and detection defect etc., to subtract
Erroneous judgement when small or elimination manual operation, improves measurement accuracy and stability.Its central principle is by machine vision mirror
Head collects optical signal to camera, then converts optical signal into electric signal to image processing system, according to collected by camera
Image information carries out various operations to extract clarification of objective, and then the device action at scene is controlled according to the result of differentiation.
On the one hand, under the overall background of industrial automation, machine vision demand is growing day by day, especially electronic manufacture,
In numerous industries such as food packaging and quality assurance, the resolving accuracy of machine visual lens is swept to line, is applicable in working range, optics
Distortion etc. requires higher and higher.On the other hand, as chip technology constantly improves, chip size is increasing, pixel dimension
It is smaller and smaller.Therefore, matching line is swept resolution of lens and to be further increased, overlayable target surface be also sized to it is existing
Camera matching.However to sweep the generally existing resolving accuracy of machine visual lens not high enough for domestic existing line, with the big target of small pixel
There is matching gap in the imager chip in face, be unable to give full play out the performance of camera, therefore target surface line big for high-resolution is swept
The research and development of machine visual lens are more urgent.
Summary of the invention
The purpose of the present invention is to provide a kind of big target surfaces of high-resolution, and enlargement ratio is adjustable, the long reach of low distortion
The adjustable fixed-focus line of multiplying power sweeps machine visual lens, to solve the problems mentioned in the above background technology.
To solve the above problems, the invention provides the following technical scheme: a kind of adjustable fixed-focus line of long reach multiplying power
Sweep machine visual lens, including the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens and
Seven lens, first lens, the 4th lens and the 7th lens have positive light coke and bent moon structure, and second lens have
Positive light coke and biconvex structure, the third lens have negative power and double-concave structure, the 5th lens and the 6th lens
With negative power and bent moon structure, second lens and the third lens are glued, form first gluing with negative power
Lens group, the 4th lens and the 5th lens are glued, form the second balsaming lens group with positive light coke, the described 6th thoroughly
Mirror and the 7th lens are glued, form the third balsaming lens group with positive light coke, and the focal length of the first balsaming lens group is
FU1, the focal length of the second balsaming lens group are fU2, and the focal length of the third balsaming lens group is fU3, the optical system
Focal length f and the first balsaming lens group, the second balsaming lens group and third balsaming lens group, meet relational expression: 1.5 < | fU1/f |
< 4,2 < | fU2/f | < 4,3 < | fU3/f | < 4.
Preferably, the distance L and optical system on rear surface vertex of the front surface vertex of first lens to the 7th lens
The focal length f of system meets relational expression: 0.3 < | L/f | < 0.6.
Preferably, the focal length f of the optics rear cut-off distance BFL of the optical system and optical system, meets relational expression: | BFL/f
|>0.90。
Preferably, the focal length f of half image height y ' of the optical system and optical system, meets relational expression: 0.35 < | y '/f
| < 0.5.
Preferably, the refractive index of first lens is n1, Abbe number v1, and refractive index meets relational expression: 1.4 < n1
< 1.55；Its Abbe number v1 meets relational expression: 65 < v1 < 90.
Preferably, the refractive index of second lens is n2, and Abbe number v2, the refractive index of the third lens is n3, Abbe
Number is v3, and refractive index n2 and n3 are all satisfied relational expression: 1.6 < n2, n3 < 1.85；Its Abbe number v2 and v3 are all satisfied relationship
Formula: 40 < v2, v3 < 55.
Preferably, the refractive index of the 4th lens is n4, and Abbe number v4, the refractive index of the 5th lens is n5, Abbe
Number is v5, and refractive index n4 and n5 meet relational expression: 1.60 < n4 <, 1.70,1.70 < n5 < 1.85 respectively；Its Abbe number v4
Relational expression: 40 < v4, v5 < 55 is all satisfied with v5.
Preferably, the focal length of the 6th lens is fG6, the focal length of the 7th lens is fG7, and focal length fG6 and fG7 meet
Relational expression: 0.1 < | fG6/fU3 | 0.2,0.1 < of < | fG7/fU3 | 0.2,0.8 < of < | fG6/fG7 | < 1.2.
Preferably, the aperture of the diaphragm of the optical system is circular hole, and the aperture of diaphragm is adjustable within the scope of F5.6~F32,
The optical system object distance range is 3.0f~13f, and when object distance changes, the first lens to the 7th lens whole group are as tune
Coke group is moved forward and backward.
Preferably, first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens and
Seven lens are spherical mirror.
Compared with prior art, the beneficial effects of the present invention are: enlargement ratio can the present invention provides high-resolution big target surface
It adjusts, low distortion, the adjustable fixed-focus line of the long reach multiplying power that can be matched with the pixel dimension of 7 μm of sizes sweeps machine vision
Camera lens realizes the optical system that the adjustable fixed-focus line of long reach multiplying power that focal length is 100mm sweeps machine visual lens, most
Great achievement image planes areWhen its resolution ratio is up to 80lp/mm, i.e. corresponding maximum imager chip, pixel can reach 12K
Pixel, full filed optical distortion are lower than 0.05%；Using whole group focusing mode, realize that operating distance 375mm~1272mm's is clear
Clear focusing is able to satisfy different application demands, while its clear aperature can also flexible modulation.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is lens construction schematic diagram of the present invention；
Fig. 2 is light path schematic diagram of the present invention；
Fig. 3 is optical transfer function figure of the present invention.
In figure: 1, the first lens, the 2, second lens, 3, the third lens, the 4, the 4th lens, the 5, the 5th lens, the 6, the 6th thoroughly
Mirror, the 7, the 7th lens, the 8, first balsaming lens group, the 9, second balsaming lens group, 10, third balsaming lens group, 11, diaphragm, 12,
Image planes.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-3, the present invention provides a kind of technical solution: a kind of adjustable fixed-focus line of long reach multiplying power sweeps machine
Device vision lens, including the first lens 1, the second lens 2, the third lens 3, the 4th lens 4, the 5th lens 5,6 and of the 6th lens
7th lens 7, first lens 1, the 4th lens 4 and the 7th lens 7 have positive light coke and bent moon structure, and described first thoroughly
The front surface vertex of mirror 1 meets relational expression to the distance L on the rear surface vertex of the 7th lens 7 and the focal length f of optical system: 0.3
< | L/f | < 0.6, the refractive index of first lens 1 are n1, Abbe number v1, and refractive index meets relational expression: 1.4 < n1
< 1.55；Its Abbe number v1 meets relational expression: 65 < v1 < 90, and second lens 2 have positive light coke and biconvex structure, institute
The third lens 3 are stated with negative power and double-concave structure, the refractive index of second lens 2 is n2, Abbe number v2, and third is saturating
The refractive index of mirror 3 is n3, Abbe number v3, and refractive index n2 and n3 are all satisfied relational expression: 1.6 < n2, n3 < 1.85；Its Abbe
Number v2 and v3 is all satisfied relational expression: 40 < v2, v3 < 55, and the 5th lens 5 and the 6th lens 6 have negative power and bent moon
Structure, second lens 2 and the third lens 3 are glued, first balsaming lens group 8 of the composition with negative power, and the described 4th
Lens 4 and the 5th lens gluing 5 form the second balsaming lens group 9 with positive light coke, the refractive index of the 4th lens 4
Refractive index for n4, Abbe number v4, the 5th lens 5 is n5, Abbe number v5, and refractive index n4 and n5 meet relationship respectively
Formula: 1.60 < n4 <, 1.70,1.70 < n5 < 1.85；Its Abbe number v4 and v5 is all satisfied relational expression: 40 < v4, v5 < 55, institute
It states the 6th lens 6 and the 7th lens 7 is glued, form the third balsaming lens group 10 with positive light coke, the 6th lens 6
Focal length is fG6, and the focal length of the 7th lens 7 is fG7, and focal length fG6 and fG7 meet relational expression: 0.1 < | fG6/fU3 | < 0.2,
0.1 < | fG7/fU3 | 0.2,0.8 < of < | fG6/fG7 | < 1.2, the focal length of the first balsaming lens group 8 are fU1, described the
The focal length of two balsaming lens groups 9 is fU2, and the focal length of the third balsaming lens group 10 is fU3, the focal length f of the optical system
With the first balsaming lens group 7, the second balsaming lens group 8 and third balsaming lens group 9, meet relational expression: 1.5 < | fU1/f | < 4,2
< | fU2/f | < 4,3 < | fU3/f | < 4, the optics rear cut-off distance BFL of the optical system and the focal length f of optical system meet relationship
Formula: | BFL/f | > 0.90, half image height y ' of the optical system and the focal length f of optical system meet relational expression: 0.35 < | y '/
F | the aperture of the diaphragm of < 0.5, the optical system are circular hole, and the aperture of diaphragm 11 is adjustable within the scope of F5.6~F32, the light
System object distance range is 3.0f~13f, and when object distance changes, 7 whole group of the first lens to 1 the 7th lens is as focusing group
It is moved forward and backward, first lens 1, the second lens 2, the third lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6 and the
Seven lens 7 are spherical mirror, advantageously ensure that the simplicity of processing technology and assembly, improve the yield rate of product, are reduced
Cost, is more suitable for producing in batches.
In this example, optical system data is as follows:
In this example, the focal length f of optical system be 100mm, maximum ring F#=5.6, the first balsaming lens group 8
Focal length fU1=-349mm, the focal length fU2=357mm of the second balsaming lens group 9, the focal length fU3=of third balsaming lens group 10
305mm, distance L=39.96mm, optics rear cut-off distance BFL=of the front surface vertex of the first lens 1 to the 7th lens 7
97.04mm, half image height y '=41mm.
Each relational expression: | fU1/f |=3.49；| fU2/f |=3.57；| fU3/f |=3.05；| L/f |=0.40；|
BFL/f |=0.97；| y '/f |=0.41.
Meet relational expression: 1.5 < | fU1/f | < 4,2 < | fU2/f | < 4,3 < | fU3/f | < 4；0.3 < | L/f | < 0.6；|
BFL/f|>0.90；0.35 < | y '/f | < 0.5.
Fig. 3 show the MTF curve figure of the present embodiment, and full filed is in mtf value > 0.3 of 80lp/mm, theoretical resolution precision
Up to 7 microns, the high-resolution imaging of optical system is realized.
The present invention provides the big target surfaces of high-resolution, and enlargement ratio is adjustable, low distortion, can be with the pixel dimension of 7 μm of sizes
The adjustable fixed-focus line of the long reach multiplying power to match sweeps machine visual lens, realizes the long working distance that focal length is 100mm
From the optical system that the adjustable fixed-focus line of multiplying power sweeps machine visual lens, maximum imaging surface isIts resolution ratio is reachable
When 80lp/mm, i.e. corresponding maximum imager chip, pixel can reach 12K pixel, and full filed optical distortion is lower than 0.05%；
Using whole group focusing mode, realizes the shape library of operating distance 375mm~1272mm, be able to satisfy different application demands, together
When its clear aperature can also flexible modulation.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (10)
1. a kind of adjustable fixed-focus line of long reach multiplying power sweeps machine visual lens, including the first lens, the second lens, third
Lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens, it is characterised in that: first lens, the 4th lens and
7th lens have positive light coke and bent moon structure, and second lens have positive light coke and biconvex structure, and the third is saturating
Mirror has negative power and a double-concave structure, and the 5th lens and the 6th lens have negative power and a bent moon structure, and described the
Two lens and the third lens are glued, form the first balsaming lens group with negative power, the 4th lens and the 5th lens
Gluing forms the second balsaming lens group with positive light coke, and the 6th lens and the 7th lens are glued, and composition has positive light
The focal length of the third balsaming lens group of focal power, the first balsaming lens group is fU1, and the focal length of the second balsaming lens group is
FU2, the focal length of the third balsaming lens group are fU3, the focal length f of the optical system and the first balsaming lens group, the second glue
Lens group and third balsaming lens group are closed, meets relational expression: 1.5 < | fU1/f | < 4,2 < | fU2/f | < 4,3 < | fU3/f | < 4.
2. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
It is: the distance L on rear surface vertex of the front surface vertex of first lens to the 7th lens and focal length f of optical system,
Meet relational expression: 0.3 < | L/f | < 0.6.
3. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: the optics rear cut-off distance BFL of the optical system and focal length f of optical system meets relational expression: | BFL/f | > 0.90.
4. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: half image height y ' of the optical system and focal length f of optical system meets relational expression: 0.35 < | y '/f | < 0.5.
5. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: the refractive index of first lens is n1, Abbe number v1, and refractive index meets relational expression: 1.4 < n1 < 1.55；Its
Abbe number v1 meets relational expression: 65 < v1 < 90.
6. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: the refractive index of second lens is n2, and Abbe number v2, the refractive index of the third lens is n3, Abbe number v3, folding
It penetrates rate n2 and n3 and is all satisfied relational expression: 1.6 < n2, n3 < 1.85；Its Abbe number v2 and v3 is all satisfied relational expression: 40 < v2, v3
< 55.
7. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: the refractive index of the 4th lens is n4, and Abbe number v4, the refractive index of the 5th lens is n5, Abbe number v5, folding
It penetrates rate n4 and n5 and meets relational expression: 1.60 < n4 <, 1.70,1.70 < n5 < 1.85 respectively；Its Abbe number v4 and v5 is all satisfied pass
It is formula: 40 < v4, v5 < 55.
8. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: the focal length of the 6th lens is fG6, the focal length of the 7th lens is fG7, and focal length fG6 and fG7 meet relational expression: 0.1
< | fG6/fU3 | 0.2,0.1 < of < | fG7/fU3 | 0.2,0.8 < of < | fG6/fG7 | < 1.2.
9. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: the aperture of the diaphragm of the optical system is circular hole, and the aperture of diaphragm is adjustable within the scope of F5.6~F32, the optical system
System object distance range is 3.0f~13f, and when object distance changes, the first lens to the 7th lens whole group are as shifting before and after focusing group
It is dynamic.
10. the adjustable fixed-focus line of a kind of long reach multiplying power according to claim 1 sweeps machine visual lens, feature
Be: first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens are
Spherical mirror.
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| CN110007433A (en) * | 2019-03-15 | 2019-07-12 | 广东奥普特科技股份有限公司 | A kind of fixed-focus line sweeps camera lens |
| CN110007443A (en) * | 2019-05-09 | 2019-07-12 | 珠海博明视觉科技有限公司 | A kind of 12K line scanning lens |
| WO2020253556A1 (en) * | 2019-06-18 | 2020-12-24 | 深圳市大疆创新科技有限公司 | Lens system, photographing apparatus and movable body |
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| CN110007443B (en) * | 2019-05-09 | 2024-02-13 | 珠海博明视觉科技有限公司 | 12K line scanning lens |
| WO2020253556A1 (en) * | 2019-06-18 | 2020-12-24 | 深圳市大疆创新科技有限公司 | Lens system, photographing apparatus and movable body |
| CN112835172A (en) * | 2020-12-31 | 2021-05-25 | 华兴源创(成都)科技有限公司 | Automatic focusing method and system for constant-magnification imaging |
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