CN109143553A - A kind of high-resolution machine visual lens - Google Patents
A kind of high-resolution machine visual lens Download PDFInfo
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- CN109143553A CN109143553A CN201811219040.XA CN201811219040A CN109143553A CN 109143553 A CN109143553 A CN 109143553A CN 201811219040 A CN201811219040 A CN 201811219040A CN 109143553 A CN109143553 A CN 109143553A
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- 230000000007 visual effect Effects 0.000 title claims abstract description 26
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 239000000571 coke Substances 0.000 claims description 24
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000009738 saturating Methods 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 description 3
- 230000004069 differentiation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004392 development of vision Effects 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- 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
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Abstract
The invention discloses high-resolution machine visual lens, including the first lens group GA, the second lens group GB and the third lens group GC set gradually by object space to picture；First lens group GA includes the first lens G1, the second lens G2, the third lens G3；Second lens group GB includes the 4th lens G4, the 5th lens G5；The third lens group GC includes the first balsaming lens U1, the second balsaming lens U2, the tenth lens G10；The focal length of optical system is f, the focal length of first lens group GA is fGA, the focal length fGB of second lens group GB, the focal length fGC of the third lens group GC, they meet relational expression respectively: 0.8 < | fGA/f | < 1.4,1.40 < | fGB/f | < 2.20,2.05 < | fGC/f | < 3.40, the machine visual lens of the application have the characteristics of high-resolution, low distortion, additionally it is possible to which the camera for being 2.2 μm with pixel dimension matches.
Description
Technical field
The invention belongs to technical field of machine vision, and in particular to a kind of high-resolution 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
Optical signal is passed to camera by head, then converts optical signal into electric signal to image processing system, image processing system by camera
Various operations are carried out to extract clarification of objective to acquired image information, and then control scene according to the result of differentiation
Device action.
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 precision, to the resolving accuracies of machine visual lens, it is applicable in working range, optical distortion etc. and wants
Ask higher and higher.On the other hand, as chip technology constantly improves, the pixel dimension of camera is smaller and smaller, this requires with
Matched resolution of lens to further increase.However the domestic existing generally existing resolving accuracy of focusing machine visual lens
It is not high enough, the performance of camera is unable to give full play out when matching with the imager chip of small pixel, therefore for high-resolution machine
The research and development of vision lens are more urgent.
Summary of the invention
It is an object of the invention to: in view of the deficiencies of the prior art, and a kind of high-resolution machine vision mirror provided
Head, which has high-resolution, the characteristics of wider operating distance, low distortion, additionally it is possible to pixel dimension be 2.2 μm
Camera matches.
In order to achieve the above object, the invention adopts the following technical scheme:
A kind of high-resolution machine visual lens, including mechanical system and the optics being installed on inside the mechanical system
System, the optical system include the first lens group GA with negative power set gradually by object space to picture, have positive light
Second lens group GB of focal power and the third lens group GC with positive light coke；The first lens group GA includes by object space to picture
The first lens G1 with positive light coke, bent moon structure is set gradually, the second lens G2 with negative power, bent moon structure,
The third lens G3 with negative power, double-concave structure；The second lens group GB includes by object space to the tool as setting gradually
There is the 4th lens G4 of positive light coke, bent moon structure, the 5th lens G5 with positive light coke, bent moon structure；The third is saturating
Microscope group GC includes the first balsaming lens U1 set gradually by object space to picture, the second balsaming lens U2, has positive light coke, biconvex
Tenth lens G10 of structure；The first balsaming lens U1 is by the 6th lens G6 with negative power, bent moon structure and has
Positive light coke, biconvex structure the 7th lens G7 gluing form；The second balsaming lens U2 is by with negative power, concave-concave knot
8th lens G8 of structure, the 9th lens G9 gluing with positive light coke, biconvex structure form；The focal length of the optical system is
The focal length of f, the first lens group GA are fGA, the focal length fGB of the second lens group GB, the coke of the third lens group GC
Away from fGC, they meet relational expression respectively: 0.8 < | fGA/f | < 1.4,1.40 < | fGB/f | < 2.20,2.05 < | fGC/f | < 3.40.
As the improvement of high-resolution machine visual lens of the present invention, the front surface top of the first lens G1
Point meets relational expression to the distance TTL of photosensitive element and the focal length f of the optical system | TTL/f | > 7.2.
As the improvement of high-resolution machine visual lens of the present invention, the optics rear cut-off distance of the optical system
The focal length f of BFL and the optical system, meet relational expression | BFL/f | > 1.5.
As the improvement of high-resolution machine visual lens of the present invention, half image height y ' of the optical system with
The focal length f of the optical system, meets relational expression | y '/f | > 0.48.
As the improvement of high-resolution machine visual lens of the present invention, the refractive index of the first lens G1 is
N1, refractive index n1 meet n1 > 1.8；The refractive index of the second lens G2 is n2, and refractive index n2 meets n2 > 1.85；It is described
The refractive index of the third lens G3 is n3, and refractive index n3 meets n3 > 1.95；The refractive index of the 4th lens G4 is n4, folding
The rate n4 of penetrating meets n4 > 1.95；The refractive index of the 5th lens G5 is n5, and refractive index n5 meets n5 > 1.90；Described tenth thoroughly
The refractive index of mirror G10 is n10, and refractive index n10 meets n10 > 1.85.
As the improvement of high-resolution machine visual lens of the present invention, the refractive index of the 6th lens G6 is
The refractive index of n6, Abbe number v6, the 7th lens G7 are n7, Abbe number v7, and refractive index n7 and n7 are all satisfied relationship
Formula: n6>1.95, n7<1.55, Abbe number meet relational expression respectively: v6<35, v7>75.
As the improvement of high-resolution machine visual lens of the present invention, the refractive index of the 8th lens G8 is
The refractive index of n8, Abbe number v8, the 9th lens G9 are n9, Abbe number v9, and refractive index n8 and n9 are all satisfied relationship
Formula: n8>1.80, n9>1.70, Abbe number meet relational expression respectively: v8<30, v9>45.
It further include diaphragm as the improvement of high-resolution machine visual lens of the present invention, the diaphragm is located at
Between the 5th lens G5 and the 6th lens G6, the aperture of the diaphragm is circular hole, and the aperture of the diaphragm is in F2.4
It is adjustable within the scope of~F16.
The beneficial effects of the present invention are: a kind of high-resolution machine view that focal length is 8mm is realized by above structure
Feel the optical system of camera lens, maximum imaging surface is φ 9mm, and resolution ratio is up to 230lp/mm, and a line is to (two pixels) width
About 4.4um is spent, i.e. a pixel is 2.2um；When corresponding maximum imager chip 1/1.8 ", pixel can reach 8,000,000, entirely
Visual field optical distortion is lower than 0.5%；Using floating focusing mode, realizes the shape library of operating distance 50mm~∞, be able to satisfy
Different application demands, while its clear aperature can also flexible modulation.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright exemplary embodiment and its explanation is used to explain the present invention, and is not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the index path of optical system in the present invention；
Fig. 3 is the MTF figure of optical system in the present invention；
Wherein, 0- optical system；1- diaphragm.
Specific embodiment
As used some vocabulary to censure specific components in the specification and claims.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer within an acceptable error range, those skilled in the art can within a certain error range solve described in
Technical problem basically reaches the technical effect.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", level "
The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, be merely for convenience of the description present invention and
Simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construction
And operation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
Below in conjunction with attached drawing, invention is further described in detail, but not as a limitation of the invention.
As shown in Figures 1 to 3, a kind of high-resolution machine visual lens, including mechanical system and it is installed on mechanical system
Internal optical system 0, optical system 0 include the first lens group GA with negative power set gradually by object space to picture,
The second lens group GB with the positive light coke and the third lens group GC with positive light coke；First lens group GA includes by object space
To as setting gradually the first lens G1 with positive light coke, bent moon structure, there are the second lens of negative power, bent moon structure
G2, the third lens G3 with negative power, double-concave structure；Second lens group GB includes by object space to as what is set gradually has
4th lens G4 of positive light coke, bent moon structure, the 5th lens G5 with positive light coke, bent moon structure；The third lens group GC
Including by object space to as setting gradually the first balsaming lens U1, the second balsaming lens U2, with positive light coke, biconvex structure
Tenth lens G10；First balsaming lens U1 by with negative power, bent moon structure the 6th lens G6 and have positive light coke,
7th lens G7 gluing of biconvex structure forms；Second balsaming lens U2 is by the 8th lens with negative power, double-concave structure
G8, the 9th lens G9 gluing with positive light coke, biconvex structure form；The focal length of optical system 0 is f, the first lens group GA
Focal length be fGA, the focal length fGB of the second lens group GB, the focal length fGC of the third lens group GC, they meet relational expression respectively:
0.8 < | fGA/f | < 1.4,1.40 < | fGB/f | < 2.20,2.05 < | fGC/f | < 3.40.
Preferably, the front surface vertex of the first lens G1 is full to the distance TTL of photosensitive element and the focal length f of optical system 0
Sufficient relational expression | TTL/f | > 7.2.
Preferably, the focal length f of the optics rear cut-off distance BFL of optical system 0 and optical system 0, meets relational expression | BFL/f | >
1.5。
Preferably, the focal length f of half image height y ' of optical system 0 and optical system 0, meets relational expression | y '/f | > 0.48.
Preferably, the refractive index of the first lens G1 is n1, and refractive index n1 meets n1 > 1.8；The refractive index of second lens G2
Meet n2 > 1.85 for n2, refractive index n2；The refractive index of the third lens G3 is n3, and refractive index n3 meets n3 > 1.95；4th
The refractive index of lens G4 is n4, and refractive index n4 meets n4 > 1.95；The refractive index of 5th lens G5 is n5, and refractive index n5 is full
Sufficient n5 > 1.90；The refractive index of tenth lens G10 is n10, and refractive index n10 meets n10 > 1.85.
Preferably, the refractive index of the 6th lens G6 is n6, and the refractive index of Abbe number v6, the 7th lens G7 are n7, Abbe
Number is v7, and refractive index n7 and n7 are all satisfied relational expression: n6>1.95, n7<1.55, Abbe number meet relational expression respectively: v6<
35, v7 > 75.
Preferably, the refractive index of the 8th lens G8 is n8, and the refractive index of Abbe number v8, the 9th lens G9 are n9, Abbe
Number is v9, and refractive index n8 and n9 are all satisfied relational expression: n8>1.80, n9>1.70, Abbe number meet relational expression respectively: v8<
30, v9 > 45.
It preferably, further include diaphragm 1, between the 5th lens G5 and the 6th lens G6, the aperture of diaphragm 1 is diaphragm 1
The aperture of circular hole, diaphragm 1 is adjustable within the scope of F2.4~F16, when object distance changes, before the second lens group GB optical axis direction
Movement is focused afterwards, and the first lens group GA and the third lens group GC are motionless.
In this example, optical system data is as follows:
In this example, the focal length f of optical system is 8mm, maximum ring F#=2.4, the group focus of the first lens group
Away from fGA=-8.59mm, the combined focal length fGB=14.15mm of the second lens group, the combined focal length fGC=of the third lens group
Distance TTL=59.3mm of the front surface vertex of 20.8mm, the first lens G1 to photosensitive element, optics rear cut-off distance BFL=
13.3mm, half image height y '=4.5mm.
Fig. 3 show the MTF curve figure of the present embodiment, and full filed is in mtf value > 0.3 of 230lp/mm, theoretical resolution precision
Up to 2.2 microns, the high-resolution imaging of optical system is realized.
A kind of optical system for high-resolution machine visual lens that focal length is 8mm is realized by above structure, it is maximum
Imaging surface is φ 9mm, and when resolution ratio is up to 230lp/mm, i.e. corresponding maximum imager chip 1/1.8 ", pixel can reach 8
Mega pixel, full filed optical distortion are lower than 0.5%；Using floating focusing mode, realize that operating distance 50mm~∞'s is clear
Focusing, is able to satisfy different application demands, while its clear aperature can also flexible modulation.
Several preferred embodiments of the invention have shown and described in above description, but as previously described, it should be understood that this hair
It is bright to be not limited to forms disclosed herein, it is not to be taken as the exclusion to other embodiments, and can be used for various other
Combination, modification and environment, and can within that scope of the inventive concept describe herein, by the technology of above-mentioned introduction or related fields or
Knowledge is modified.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be
In the protection scope of appended claims of the present invention.
Claims (8)
1. a kind of high-resolution machine visual lens, it is characterised in that: including mechanical system and be installed on the mechanical system
Internal optical system (0), the optical system (0) include saturating to first with negative power as setting gradually by object space
Microscope group GA, the second lens group GB with positive light coke and the third lens group GC with positive light coke；First lens group
GA includes having negative power, bent moon knot to as setting gradually the first lens G1 with positive light coke, bent moon structure by object space
Second lens G2 of structure, the third lens G3 with negative power, double-concave structure；The second lens group GB include by object space to
As the 4th lens G4 with positive light coke, bent moon structure set gradually, the 5th lens with positive light coke, bent moon structure
G5；The third lens group GC includes the first balsaming lens U1 set gradually by object space to picture, the second balsaming lens U2, has
Tenth lens G10 of positive light coke, biconvex structure；The first balsaming lens U1 is by with negative power, bent moon structure
Six lens G6 and the 7th lens G7 gluing with positive light coke, biconvex structure form；The second balsaming lens U2 is by having
8th lens G8 of negative power, double-concave structure, the 9th lens G9 gluing with positive light coke, biconvex structure form；It is described
The focal length of optical system (0) is f, and the focal length of the first lens group GA is fGA, the focal length fGB of the second lens group GB, institute
The focal length fGC of the third lens group GC is stated, they meet relational expression respectively: 0.8 < | fGA/f | < 1.4,1.40 < | fGB/f | < 2.20,
2.05<|fGC/f|<3.40。
2. high-resolution machine visual lens according to claim 1, it is characterised in that: before the first lens G1
Surface vertices meet relational expression to the distance TTL of photosensitive element and the focal length f of the optical system (0) | TTL/f | > 7.2.
3. high-resolution machine visual lens according to claim 1, it is characterised in that: the optical system (0)
The focal length f of optics rear cut-off distance BFL and the optical system (0), meet relational expression | BFL/f | > 1.5.
4. high-resolution machine visual lens according to claim 1, it is characterised in that: the optical system (0)
The focal length f of half image height y ' and the optical system (0), meet relational expression | y '/f | > 0.48.
5. high-resolution machine visual lens according to claim 1, it is characterised in that: the folding of the first lens G1
Penetrating rate is n1, and refractive index n1 meets n1 > 1.8；The refractive index of the second lens G2 be n2, refractive index n2 meet n2 >
1.85；The refractive index of the third lens G3 is n3, and refractive index n3 meets n3 > 1.95；The refractive index of the 4th lens G4
Meet n4 > 1.95 for n4, refractive index n4；The refractive index of the 5th lens G5 is n5, and refractive index n5 meets n5 > 1.90；
The refractive index of the tenth lens G10 is n10, and refractive index n10 meets n10 > 1.85.
6. high-resolution machine visual lens according to claim 1, it is characterised in that: the folding of the 6th lens G6
Penetrating rate is n6, and the refractive index of Abbe number v6, the 7th lens G7 are n7, and Abbe number v7, refractive index n7 and n7 are full
Sufficient relational expression: n6>1.95, n7<1.55, Abbe number meet relational expression respectively: v6<35, v7>75.
7. high-resolution machine visual lens according to claim 1, it is characterised in that: the folding of the 8th lens G8
Penetrating rate is n8, and the refractive index of Abbe number v8, the 9th lens G9 are n9, and Abbe number v9, refractive index n8 and n9 are full
Sufficient relational expression: n8>1.80, n9>1.70, Abbe number meet relational expression respectively: v8<30, v9>45.
8. high-resolution machine visual lens according to claim 1, it is characterised in that: it further include diaphragm (1), it is described
For diaphragm (1) between the 5th lens G5 and the 6th lens G6, the aperture of the diaphragm (1) is circular hole, diaphragm (1)
Aperture it is adjustable within the scope of F2.4~F16.
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| CN109884779A (en) * | 2019-03-15 | 2019-06-14 | 广东奥普特科技股份有限公司 | A kind of low distortion camera lens |
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Cited By (4)
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| CN109633875B (en) * | 2019-01-14 | 2023-10-27 | 广东奥普特科技股份有限公司 | Telecentric lens capable of continuously changing magnification |
| CN109884779A (en) * | 2019-03-15 | 2019-06-14 | 广东奥普特科技股份有限公司 | A kind of low distortion camera lens |
| CN109884779B (en) * | 2019-03-15 | 2023-10-27 | 广东奥普特科技股份有限公司 | Low-distortion lens |
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