CN108594401A - A kind of big target surface focusing machine visual linear array camera lens - Google Patents
A kind of big target surface focusing machine visual linear array camera lens Download PDFInfo
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- CN108594401A CN108594401A CN201810636187.2A CN201810636187A CN108594401A CN 108594401 A CN108594401 A CN 108594401A CN 201810636187 A CN201810636187 A CN 201810636187A CN 108594401 A CN108594401 A CN 108594401A
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- target surface
- linear array
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a kind of big target surface focusing machine visual linear array camera lenses, the optical system of the camera lens by object space to image space include successively have positive light coke, bent moon structure the first lens, the second lens with positive light coke, bent moon structure, the third lens with negative power, bent moon structure, the 4th lens with positive light coke, biconvex structure, the 5th lens with negative power, double-concave structure, with negative power, the 6th lens of double-concave structure and the 7th lens with positive light coke, biconvex structure；The focal length of optical system is f ', and half image height of target surface of optical system is y ', meets relational expression：|y’/f’|≥0.45.Above structure realizes focal length in 29mm, and when corresponding chip size is 30mm, main enlargement ratio is 0.10X, can be 0.04X~0.33X with enlargement ratio.Within the scope of available enlargement ratio, by changing the object distance of camera lens, and adjusting rear cut-off distance can blur-free imaging.
Description
Technical field
The present invention relates to machine visual lens technical fields, and in particular to a kind of big target surface focusing machine visual linear array mirror
Head.
Background technology
Machine vision is exactly to replace human eye with machine to measure and judge.NI Vision Builder for Automated Inspection refers to passing through image capture
Device (being divided to two kinds of CMOS and CCD) will be ingested target and be converted into picture signal, send dedicated image processing system to, according to
The information such as pixel distribution and brightness, color, are transformed into digitized signal；Picture system carries out various operations to take out to these signals
Clarification of objective is taken, and then controls the device action at scene according to the result of differentiation.
Image-pickup device is divided into linear array type knead dough formation according to chip type.In field of high-precision measurement, generally use
Linear array type camera, typical field of application are the size for detecting material or the defect on surface, such as metal, plastics, paper and fiber
Deng.The usual uniform motion of detected object, can be right when scanning using one or more camera to its continuous scanning line by line
Uniline image is handled, or is handled the face system of battle formations picture being made of multirow.Due to point of linear array type camera sensor
Resolution is high, its measurement accuracy can reach micron order.
Traditional focusing machine visual linear array camera lens is difficult to have good resolution and lower distortion；Big visual field is set simultaneously
Meter can not effectively reduce the space needed for installation and the resolution of conventional lenses can generate very with the change of enlargement ratio
Big variation shows in available enlargement ratio either with or without more stable imaging.
Invention content
It is an object of the invention to：In view of the deficiencies of the prior art, a kind of big target surface focusing machine visual linear array is provided
Camera lens possesses good resolution and lower distortion when matching big target surface camera；Big visual field design can effectively subtract simultaneously
Space needed for small installation；Prodigious variation can be generated with the change of enlargement ratio different from the resolution of conventional lenses,
The camera lens has more stable imaging performance in available enlargement ratio.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of big target surface focusing machine visual linear array camera lens, including mechanical system and be installed on inside the mechanical system
Optical system, the optical system by object space to image space include successively have positive light coke, bent moon structure the first lens G1, tool
Have positive light coke, bent moon structure the second lens G2, with negative power, bent moon structure the third lens G3, have positive light focus
4th lens G4 of degree, biconvex structure, the 5th lens G5 with negative power, double-concave structure have negative power, concave-concave knot
6th lens G6 of structure and the 7th lens G7 with positive light coke, biconvex structure；The second lens G2 and the third lens G3
Forming the first balsaming lens B1, the 4th lens G4 with negative power and the 5th lens G5 compositions has positive light coke
Second balsaming lens B2, the 6th lens G6 and the 7th third balsaming lens B3 of the lens G7 compositions with positive light coke；Institute
The focal length for stating optical system is f ', and half image height of target surface of the optical system is y ', meets relational expression：|y’/f’|≥0.45.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the coke of the optical system
Away from meeting relational expression between f ', with the first focal length of lens f1：1<|f1/f’|<1.5；The focal length of the first balsaming lens B1
Focal length for fB1, the first balsaming lens B2 is fB2, and the focal length of the first balsaming lens B3 is fB3, is met following
Relational expression：0.7<|fB1/f’|<0.86；0.7<|fB2/f’|<0.86；1<|fB3/f’|<1.29；0.9<|fB1/fB2|<1.1；
0.55<|fB1/fB3|<0.86；0.55<|fB2/fB3|<0.86.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the first lens G1's
Refractive index is n1, and Abbe number v1 meets relational expression：1.95<n1<2.05；20<v1<30.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the second lens G2's
Refractive index is n2, and Abbe number v2 meets relational expression：1.55<n2<1.65；60<v2<70.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the third lens G3's
Refractive index is n3, and Abbe number v3 meets relational expression：1.75<n3<1.85；20<v3<30.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the 4th lens G4's
Refractive index is n4, and Abbe number v4 meets relational expression：1.95<n4<2.05；20<v4<30.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the 5th lens G5's
Refractive index is n5, and Abbe number v5 meets relational expression：1.45<n5<1.55；60<v5<70.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the 6th lens G5's
Refractive index is n6, and Abbe number v6 meets relational expression：1.8<n6<1.9；20<v6<30.
As a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, the 7th lens G7's
Refractive index is n7, and Abbe number v7 meets relational expression：1.65<n7<1.75；50<v7<60.
Further include diaphragm as a kind of improvement of big target surface focusing machine visual linear array camera lens of the present invention, it is described
Diaphragm is set between the third lens G3 and the 4th lens G4, and the aperture of the diaphragm is circular hole, the aperture of diaphragm
It is adjustable within the scope of F2.8~F16.
The beneficial effects of the present invention are：The present invention can possess when matching big target surface camera good resolution and compared with
Low distortion；Big visual field design can effectively reduce the space needed for installation simultaneously；It can be with different from the resolution of conventional lenses
It the change of enlargement ratio and generates prodigious variation, which has more stable imaging performance in available enlargement ratio.
Focal length is realized in 29mm, when corresponding chip size is 30mm, main enlargement ratio is 0.10X, can be 0.04X with enlargement ratio
~0.33X；Within the scope of available enlargement ratio, by changing the object distance of camera lens, and adjusting rear cut-off distance can blur-free imaging.Wherein,
Under nominal one, full filed distortion is less than 0.2%.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and constitutes the part of the present invention, this hair
Bright exemplary embodiment and its explanation is not constituted improper limitations of the present invention for explaining 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 curve figure of the optical system of the present invention；
Fig. 4 is the curvature of field curve graph of the optical system of the present invention；
Fig. 5 is the distortion curve figure of the optical system of the present invention.
Specific implementation mode
Some vocabulary has such as been used to censure specific components in specification and claim.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 used as the mode for distinguishing component, but is used as the criterion of differentiation with the difference of component functionally.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 in acceptable error range, those skilled in the art can be described within a certain error range solution
Technical problem basically reaches the technique effect.
In the description of the present invention, it is to be understood that, term "upper", "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, does not indicate or imply the indicated device or element must have a particular orientation, with specific azimuth configuration
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 connects, and can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two members
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 Fig. 1~5, a kind of big target surface focusing machine visual linear array camera lens, including mechanical system and it is installed on machinery
The optical system of internal system, optical system by object space to image space include successively have positive light coke, bent moon structure first thoroughly
Mirror G1, the second lens G2 with positive light coke, bent moon structure, the third lens G3 with negative power, bent moon structure have
4th lens G4 of positive light coke, biconvex structure, with negative power, double-concave structure the 5th lens G5, have negative power,
6th lens G6 of double-concave structure and the 7th lens G7 with positive light coke, biconvex structure；Second lens G2 and the third lens
G3 compositions the first balsaming lens B1 with negative power, the 4th lens G4 and the 5th lens G5 composition have the of positive light coke
Two balsaming lens B2, the 6th lens G6 and the 7th third balsaming lens B3 of the lens G7 compositions with positive light coke；Optical system
Focal length be f ', half image height of target surface of optical system is y ', meets relational expression：|y’/f’|≥0.45.
Preferably, the focal length of optical system meets relational expression between f ', with the first focal length of lens f1：1<|f1/f’|<
1.5；The focal length of first balsaming lens B1 is fB1, and the focal length of the first balsaming lens B2 is fB2, the focal length of the first balsaming lens B3
For fB3, meet following relationship：0.7<|fB1/f’|<0.86；0.7<|fB2/f’|<0.86；1<|fB3/f’|<1.29；
0.9<|fB1/fB2|<1.1；0.55<|fB1/fB3|<0.86；0.55<|fB2/fB3|<0.86.
Preferably, the refractive index of the first lens G1 is n1, and Abbe number v1 meets relational expression：1.95<n1<2.05；20
<v1<30。
Preferably, the refractive index of the second lens G2 is n2, and Abbe number v2 meets relational expression：1.55<n2<1.65；60
<v2<70。
Preferably, the refractive index of the third lens G3 is n3, and Abbe number v3 meets relational expression：1.75<n3<1.85；20
<v3<30。
Preferably, the refractive index of the 4th lens G4 is n4, and Abbe number v4 meets relational expression：1.95<n4<2.05；20
<v4<30。
Preferably, the refractive index of the 5th lens G5 is n5, and Abbe number v5 meets relational expression：1.45<n5<1.55；60
<v5<70。
Preferably, the refractive index of the 6th lens G5 is n6, and Abbe number v6 meets relational expression：1.8<n6<1.9；20<
v6<30。
Preferably, the refractive index of the 7th lens G7 is n7, and Abbe number v7 meets relational expression：1.65<n7<1.75；50
<v7<60。
The invention also includes diaphragm 100, diaphragm 100 is set between the third lens G3 and the 4th lens G4, diaphragm 100
Aperture is circular hole, and the aperture of diaphragm 100 is adjustable within the scope of F2.8~F16.
In the present embodiment, the parameter of optical system is as follows：
| Surface | Radius (mm) | Thickness (mm) | Refractive index | Abbe number |
| The front curve of first lens G1 | 22.2 | 2.9 | 2.0 | 28.5 |
| The rear curved surface of first lens G1 | 48.5 | 0.1 | ||
| The front curve of second lens G2 | 10.8 | 4.8 | 1.6 | 65.5 |
| The front curve of the third lens G3 | 106.8 | 1.0 | 1.8 | 25.5 |
| The rear curved surface of the third lens G3 | 6.9 | 4.2 | ||
| Diaphragm | It is infinitely great | 1.8 | ||
| The front curve of the third lens G4 | 39.9 | 3.0 | 2.0 | 25.5 |
| The front curve of 5th lens G5 | -18.4 | 1.6 | 1.5 | 66.0 |
| The rear curved surface of 5th lens G5 | 30.4 | 1.2 | ||
| The front curve of 6th lens G6 | -29.3 | 1 | 1.8 | 24.0 |
| The front curve of 7th lens G7 | 18.1 | 5.7 | 1.7 | 54.5 |
| The rear curved surface of 7th lens G7 | -12.5 | |||
| Image planes | It is infinitely great |
Focal length is realized in 29mm by above structure, and when corresponding chip size is 30mm, main enlargement ratio is
0.10X can be 0.04X~0.33X with enlargement ratio.Within the scope of available enlargement ratio, by changing the object distance of camera lens, and adjust
Saving rear cut-off distance can blur-free imaging.Wherein, under nominal one, full filed distortion is less than 0.2%.As shown in figure 3, this implementation
0.3, the 0.8 visual field mtf value ＞ 0.4 of mtf value ＞ of optical system full filed in 40lp/mm of example, can match pixel dimension
12.5 μm or more of imager chip.The image planes size of the present embodiment is as shown in Figure 4The picture point of entire visual field exists
Within the scope of the 0.4mm of image planes position, illustrate that the optical system of the present embodiment has smaller curvature of the image.As shown in figure 5, this reality
A full filed aberration control is applied within ± 0.05%, illustrates that systematical distortion amount is small, meets the needs of vision application.
Several preferred embodiments of the present 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 form disclosed herein, it is not to be taken as the exclusion to other embodiment, and can be used for various other
Combination, modification and environment, and can in the scope of the invention is set forth herein, by the technology of above-mentioned introduction or related field 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 domain of appended claims of the present invention.
Claims (10)
1. a kind of big target surface focusing machine visual linear array camera lens, it is characterised in that：Including mechanical system and it is installed on the machinery
The optical system of internal system, the optical system by object space to image space include successively have positive light coke, bent moon structure
One lens G1, the second lens G2 with positive light coke, bent moon structure, the third lens G3 with negative power, bent moon structure,
The 4th lens G4 with positive light coke, biconvex structure, the 5th lens G5 with negative power, double-concave structure have negative light
Focal power, the 6th lens G6 of double-concave structure and the 7th lens G7 with positive light coke, biconvex structure；The second lens G2 with
First balsaming lens B1, the fourth lens G4 of the third lens G3 compositions with negative power has with the 5th lens G5 compositions
Second balsaming lens B2, the 6th lens G6 of positive light coke and the 7th third of the lens G7 compositions with positive light coke are glued
Lens B3；The focal length of the optical system is f ', and half image height of target surface of the optical system is y ', meets relational expression：|y’/f’|
≥0.45。
2. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The optical system
Focal length is f ', meets relational expression between the first focal length of lens f1：1<|f1/f’|<1.5；The coke of the first balsaming lens B1
Away from for fB1, the focal length of the first balsaming lens B2 is fB2, and the focal length of the first balsaming lens B3 is fB3, meet with
Lower relational expression：0.7<|fB1/f’|<0.86；0.7<|fB2/f’|<0.86；1<|fB3/f’|<1.29；0.9<|fB1/fB2|<
1.1；0.55<|fB1/fB3|<0.86；0.55<|fB2/fB3|<0.86.
3. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The first lens G1
Refractive index be n1, Abbe number v1 meets relational expression：1.95<n1<2.05；20<v1<30.
4. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The second lens G2
Refractive index be n2, Abbe number v2 meets relational expression：1.55<n2<1.65；60<v2<70.
5. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The third lens G3
Refractive index be n3, Abbe number v3 meets relational expression：1.75<n3<1.85；20<v3<30.
6. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The 4th lens G4
Refractive index be n4, Abbe number v4 meets relational expression：1.95<n4<2.05；20<v4<30.
7. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The 5th lens G5
Refractive index be n5, Abbe number v5 meets relational expression：1.45<n5<1.55；60<v5<70.
8. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The 6th lens G5
Refractive index be n6, Abbe number v6 meets relational expression：1.8<n6<1.9；20<v6<30.
9. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：The 7th lens G7
Refractive index be n7, Abbe number v7 meets relational expression：1.65<n7<1.75；50<v7<60.
10. big target surface focusing machine visual linear array camera lens according to claim 1, it is characterised in that：Further include diaphragm, institute
It states diaphragm to be set between the third lens G3 and the 4th lens G4, the aperture of the diaphragm is circular hole, the light of diaphragm
Circle is adjustable within the scope of F2.8~F16.
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|---|---|---|---|
| CN201810636187.2A CN108594401B (en) | 2018-06-20 | 2018-06-20 | Large target surface fixed focus machine vision linear array lens |
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|---|---|---|---|
| CN201810636187.2A CN108594401B (en) | 2018-06-20 | 2018-06-20 | Large target surface fixed focus machine vision linear array lens |
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| CN108594401A true CN108594401A (en) | 2018-09-28 |
| CN108594401B CN108594401B (en) | 2023-10-03 |
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Cited By (7)
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|---|---|---|---|---|
| CN109100856A (en) * | 2018-10-19 | 2018-12-28 | 广东奥普特科技股份有限公司 | A kind of big adjustable line of target surface multiplying power of high-resolution sweeps machine visual lens |
| CN109116517A (en) * | 2018-10-19 | 2019-01-01 | 广东奥普特科技股份有限公司 | A kind of big target surface high-res line of high magnification sweeps machine visual lens |
| CN109164562A (en) * | 2018-11-05 | 2019-01-08 | 广东奥普特科技股份有限公司 | A kind of adjustable fixed-focus line of long reach multiplying power sweeps machine visual lens |
| CN109633874A (en) * | 2019-01-23 | 2019-04-16 | 广东奥普特科技股份有限公司 | A kind of telecentric lens |
| WO2021127843A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN113467053A (en) * | 2021-07-14 | 2021-10-01 | 光虎光电科技(天津)有限公司 | Large-target-surface FA lens |
| CN115032763A (en) * | 2022-05-20 | 2022-09-09 | 佛山华国光学器材有限公司 | Side surface optical imaging system |
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| CN109100856B (en) * | 2018-10-19 | 2023-10-03 | 广东奥普特科技股份有限公司 | High-resolution large-target-surface-magnification-adjustable line-scanning machine vision lens |
| CN109116517B (en) * | 2018-10-19 | 2023-10-10 | 广东奥普特科技股份有限公司 | High-resolution linear scanning machine vision lens with high magnification and large target surface |
| CN109164562A (en) * | 2018-11-05 | 2019-01-08 | 广东奥普特科技股份有限公司 | A kind of adjustable fixed-focus line of long reach multiplying power sweeps machine visual lens |
| CN109633874A (en) * | 2019-01-23 | 2019-04-16 | 广东奥普特科技股份有限公司 | A kind of telecentric lens |
| CN109633874B (en) * | 2019-01-23 | 2024-02-02 | 广东奥普特科技股份有限公司 | Telecentric lens |
| WO2021127843A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN113467053A (en) * | 2021-07-14 | 2021-10-01 | 光虎光电科技(天津)有限公司 | Large-target-surface FA lens |
| CN115032763A (en) * | 2022-05-20 | 2022-09-09 | 佛山华国光学器材有限公司 | Side surface optical imaging system |
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