CN106154517A - Doubly telecentric tight shot - Google Patents
Doubly telecentric tight shot Download PDFInfo
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- CN106154517A CN106154517A CN201510162603.6A CN201510162603A CN106154517A CN 106154517 A CN106154517 A CN 106154517A CN 201510162603 A CN201510162603 A CN 201510162603A CN 106154517 A CN106154517 A CN 106154517A
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Abstract
The invention discloses a kind of doubly telecentric tight shot, start to be sequentially provided with first single positive spheric glass, second single positive spheric glass, the 3rd single negative spheric glass, the 4th single negative spheric glass, the 5th single negative spheric glass, the 6th single positive spheric glass and the 7th single positive spheric glass from testee end；Second single positive spheric glass and the 3rd single negative spheric glass are combined as bonding eyeglass；5th single negative spheric glass and the 6th single positive spheric glass are combined as bonding eyeglass；It is provided with diaphragm between 3rd single negative spheric glass and the 4th single negative spheric glass.The doubly telecentric tight shot of the present invention decreases the quantity of eyeglass so that cost of manufacture is cheaper；Under the premise of eyeglass is less, make that structure is simpler, volume is less, weight lighter, doubly telecentric tight shot also has the feature that camera lens total length is little, F value imaging surface big, maximum is big simultaneously.
Description
Technical field
The present invention relates to a kind of industrial lens for accurate industrial detection, particularly relate to a kind of telecentricity tight shot.
Background technology
As NI Vision Builder for Automated Inspection is in the extensive application in Precision measurement field, general industry camera lens has been difficult to meet testing requirement, and this is to there are following restraining factors due to ordinary optical camera lens, the error that the 1st, the deformation of image, visual angle select and cause；2nd, inappropriate light source causes the problems such as the uncertainty on border, and then the precision of impact measurement under disturbing.
For making up the deficiency that common lens exists, adapting to Precision measurement demand, telecentric lens arises at the historic moment.Telecentric lens is according to the optical characteristics of its uniqueness: high-resolution, the ultra-wide depth of field, ultra-low distortion and exclusive directional light design etc., it can be in certain object distance range, the image obtaining is made to amplify, multiplying power will not change, and this is very important application to the measured object not situation on same object plane.
But now the general Heavy Weight of telecentric lens on the market, size is big, cost of manufacture is higher, this allows for telecentric lens and is difficult in industrial detection universal.
Content of the invention
In order to solve the deficiency that prior art exists, the present invention provides a kind of doubly telecentric tight shot.
To achieve these goals, the technical solution used in the present invention is: a kind of doubly telecentric tight shot, starts to be sequentially provided with first single positive spheric glass, second single positive spheric glass, the 3rd single negative spheric glass, the 4th single negative spheric glass, the 5th single negative spheric glass, the 6th single positive spheric glass and the 7th single positive spheric glass from testee end；Described second single positive spheric glass and the 3rd single negative spheric glass are combined as bonding eyeglass；Described 5th single negative spheric glass and the 6th single positive spheric glass are combined as bonding eyeglass；It is provided with diaphragm between described 3rd single negative spheric glass and the 4th single negative spheric glass.
Further improving, described first single positive spheric glass, second single positive spheric glass, the 6th single positive spheric glass, the 7th single positive spheric glass are lenticular positive lens；Described 3rd single negative spheric glass and the 5th single negative spheric glass are concave concave negative lens；Described 4th single negative spheric glass is the negative lens of falcate, and opening direction is towards camera-side.
Further improving, after described second single positive spheric glass and the 3rd single negative spheric glass are combined into bonding eyeglass, opening direction is towards camera-side.
Further improving, the material that described second single positive spheric glass uses is low dispersion.
Further improving, after described 5th single negative spheric glass and the 6th single positive spheric glass are combined into bonding eyeglass, opening direction is back to camera-side.
Further improving, described doubly telecentric tight shot satisfies the following conditional expression: NA=0.022
TTL=180mm T≤0.025°；Wherein NA is lens opening value, and TTL is the optics total length of camera lens, and T is the telecentricity of camera lens.
Further improving, described doubly telecentric tight shot satisfies the following conditional expression: satisfy the following conditional expression: f/f1=the 0.112nd, f1=123.1 mm；f/f2= 0.045、f2=49.59mm；f/f3=-0.038、 f3=-42.26mm；f/f4=-0.093、f4=-102.56mm；f/f5=0.01、f5=-11.94mm；f/f6=0.015、f6=16.04mm；f/f7=0.026、f7=29.18mm；
Wherein f is the effective focal length of camera lens, f1 is the focal length of first single positive spherical lens, f2 is the focal length of second single positive spherical lens, f3 is the focal length of the 3rd single negative spherical lens, f4 is the focal length of the 4th single negative spherical lens, f5 is the focal length of the 5th single negative spherical lens, and f6 is the focal length of the 6th single positive spherical lens, and f7 is the focal length of the 7th single positive spherical lens.
Beneficial effects of the present invention:
Table 1 is enumerated the parameter value of the every lens of diplocardia tight shot for industrial detection of the present invention.
Wherein OBJ is object plane, and STO is diaphragm, and IMA is image planes.
As can be known from Table 1, this camera lens uses seven pieces of eyeglasses, maximum effective aperture is 72.8mm, needs 10 to 12 eyeglasses minimum relative to the telecentric lens of market just can accomplish that maximum effective aperture is about 120mm, therefore the doubly telecentric tight shot after employing technical solution of the present invention decreases the quantity of eyeglass, the structure making whole camera lens is simpler, and weight significantly reduces relative to similar camera lens, and cost of manufacture is cheaper；Under the premise of eyeglass is less, make that structure is simpler, volume is less, weight is lighter.
The optical characteristics that table 2 lists the diplocardia tight shot for industrial detection of the present invention is regular:
Wherein: Magnification is the enlargement ratio of camera lens, Object Side Telecentricity is thing side's telecentricity of camera lens, Optical Distortion (Max) is the greatest optical distortion of camera lens, TTL is the optics total length of camera lens, F/# is the F value of camera lens, Relative illumination is the relative illumination of camera lens, and Image Size (Dia.) is the maximum image planes of camera lens.
As known from Table 2, the telecentricity using technical solution of the present invention rear lens is 0.025, and telecentricity is high；Distortion is 0.1%, distorts little；Optics overall length is 180mm, and total length is little；Maximum F value is 6.3；Relative illumination is 97%, and relative illumination is high；Maximum image planes are φ 16mm, and image planes are big.Relative to existing coordinate on the market away under the conditions of industry telecentricity general optics overall length at about 300mm, maximum image planes are φ 11mm, and maximum F value is 8.Therefore the doubly telecentric of the present invention focuses mirror and has the advantages that total length is little, F value imaging surface big, maximum is big relative to telecentric lens on the market.
Brief description
Fig. 1 is optical cross section figure when being 260 mm for the doubly telecentric tight shot object distance；
Fig. 2 be doubly telecentric tight shot object distance be 260 mm, optical transfer function (MTF) sectional view when 140lp/mm for the resolving power；
Fig. 3 be doubly telecentric tight shot object distance be 260 mm, optical transfer function (MTF) sectional view when 100lp/mm for the resolving power；
Fig. 4 be doubly telecentric tight shot object distance be 260 mm, optical transfer function (MTF) sectional view when 70lp/mm for the resolving power；
Fig. 5 is disc of confusion RMS figure when being 260 mm for the doubly telecentric tight shot object distance；
Fig. 6 is curvature of field figure when being 260 mm for the doubly telecentric tight shot object distance and distortion figure；
Fig. 7 is out of focus modulation transfer function figure when being 260 mm for the doubly telecentric tight shot object distance；
Fig. 8 is the relative illumination figure when object distance is 260 mm for the doubly telecentric tight shot；
Wherein: the 1st, first single positive spheric glass, the 2nd, second single positive spheric glass, the 3rd, the 3rd single negative spheric glass, the 4th, the 4th single positive spheric glass, the 5th, the 5th single negative spheric glass, the 6th, the 6th single positive spheric glass, the 7th, the 7th single positive spheric glass, the 8th, diaphragm.
Detailed description of the invention
Below in conjunction with the accompanying drawings currently preferred mode is further elaborated: as it is shown in figure 1, the solution of the present invention is introduced and illustrates by this particular form when present embodiment is 260 mm by the object distance of doubly telecentric tight shot.A kind of doubly telecentric tight shot, starts to be sequentially provided with first single positive spheric glass the 1st, second single positive spheric glass the 2nd, the 3rd single negative spheric glass the 3rd, the 4th single negative spheric glass the 4th, the 5th single negative spheric glass the 5th, the 6th single positive spheric glass 6 and the 7th single positive spheric glass 7 from testee end.Described first single positive spheric glass the 1st, second single positive spheric glass the 2nd, the 6th single positive spheric glass the 6th, the 7th single positive spheric glass 7 is lenticular positive lens；The material decreasing the single positive spheric glass employing of the chromatic dispersion problem second in optical system is low dispersion.Described 3rd single negative spheric glass 3 and the 5th single negative spheric glass 5 are concave concave negative lens；The negative lens that described 4th single negative spheric glass 4 is falcate, opening direction is towards camera-side.Described second single positive spheric glass 2 and the 3rd single negative spheric glass 3 are combined as bonding eyeglass；After described second single positive spheric glass 2 and the 3rd single negative spheric glass 3 are combined into bonding eyeglass, opening direction is towards camera-side.It is provided with diaphragm between described 3rd single negative spheric glass 3 and the 4th single negative spheric glass 4.Described 5th single negative spheric glass 5 and the 6th single positive spheric glass 6 are combined as bonding eyeglass；After described 5th single negative spheric glass 5 and the 6th single positive spheric glass 6 are combined into bonding eyeglass, opening direction is back to camera-side.
Described doubly telecentric tight shot satisfies the following conditional expression: NA=0.022
TTL=180mm T≤0.025°；Wherein NA is lens opening value, and TTL is the optics total length of camera lens, and T is the telecentricity of camera lens.TTL is the optics total length of camera lens, and the length on i.e. first single positive spheric glass summit to imaging surface, T is transmitting and the incident angle of the telecentricity of camera lens, i.e. object plane and image planes.
Described doubly telecentric tight shot satisfies the following conditional expression: f/f1=the 0.112nd, f1=123.1 mm；f/f2= 0.045、f2=49.59mm；f/f3=-0.038、 f3=-42.26mm；f/f4=-0.093、f4=-102.56mm；f/f5=0.01、f5=-11.94mm；f/f6=0.015、f6=16.04mm；f/f7=0.026、f7=29.18mm；Wherein f is the effective focal length of camera lens, f1 is the focal length of first single positive spherical lens, f2 is the focal length of second single positive spherical lens, f3 is the focal length of the 3rd single negative spherical lens, f4 is the focal length of the 4th single negative spherical lens, f5 is the focal length of the 5th single negative spherical lens, and f6 is the focal length of the 6th single positive spherical lens, and f7 is the focal length of the 7th single positive spherical lens.
nullThe advantage brought after verifying employing technical scheme below by the object distance of doubly telecentric tight shot by related experiment figure during 260 mm: wherein Fig. 2、Fig. 3、Fig. 4 is respectively at 140lp/mm、100lp/mm、Optical transfer function (MTF) sectional view during 70lp/mm，Wherein TS DIFF.LIMIT (black lines) be camera lens be diffraction limit curve，TS 0.0000MM、TS 1.0000MM、TS 2.0000MM、TS 3.0000MM、TS 4.4000MM is respectively lens imaging at image plane center、¢1、¢2、¢3、The optical transfer function curve of 4.4，Can be seen that lens imaging at image plane center from figure、¢1、¢2、¢3、The optical transfer function curve of 4.4 has nearly reached the diffraction limit curve of camera lens，Illustrate that the image quality of camera lens is fine.
Wherein Fig. 5 is disc of confusion RMS figure, wherein IMA:0.0000MM, IMA:1.0000MM, IMA:2.0000MM, IMA:3.0000MM, IMA:4.4000MM be respectively lens imaging image plane center, the 1st, the 2nd, the 3rd, 4.4 disc of confusion figure, can be seen that camera lens disc of confusion compares concentration from figure, disc of confusion scope is within 3.8 m.
Wherein Fig. 6 is curvature of field figure and distortion figure, and wherein left side figure is the curvature of field figure of camera lens, and the curvature of field is within 0.04mm；The distortion figure that the right is camera lens, distortion is within 0.1%.
Wherein Fig. 7 is out of focus modulation transfer function figure, wherein TS 0.0000MM, TS 1.0000MM, TS 2.0000MM, TS 3.0000MM, TS 4.4000MM be respectively lens imaging image plane center, the 1st, the 2nd, the 3rd, 4.4 out of focus modulation transfer function, as can be seen from Figure 7 camera lens at center, the 1st, the 2nd, the 3rd, the out of focus modulation transfer function of 4.4 is concentrated very much, illustrates that camera lens is consistent with edge picture element at the center of imaging.
Wherein Fig. 8 is camera lens relative illumination figure, and camera lens illumination margin and center ratio is more consistent, and margin and center illumination ratio reaches 97%.
Claims (7)
1. a doubly telecentric tight shot, it is characterised in that: start to be sequentially provided with first single positive spheric glass (1), second single positive spheric glass (2), the 3rd single negative spheric glass (3), the 4th single negative spheric glass (4), the 5th single negative spheric glass (5), the 6th single positive spheric glass (6) and the 7th single positive spheric glass (7) from testee end；Described second single positive spheric glass (2) is born spheric glass (3) with the 3rd list and is combined as bonding eyeglass；Described 5th single negative spheric glass (5) is combined as bonding eyeglass with the 6th list just spheric glass (6)；It is provided with diaphragm (7) between described 3rd single negative spheric glass (3) and the 4th single negative spheric glass (4).
2. doubly telecentric tight shot according to claim 1, it is characterised in that: described first single positive spheric glass (1), second single positive spheric glass (2), the 6th single positive spheric glass (3), the 7th single positive spheric glass (7) they are lenticular positive lens；Described 3rd single negative spheric glass (3) and the 5th single negative spheric glass (5) are concave concave negative lens；Described 4th single negative spheric glass (4) is the negative lens of falcate, and opening direction is towards camera-side.
3. doubly telecentric tight shot according to claim 1, it is characterised in that: after described second single positive spheric glass (2) and the 3rd single negative spheric glass (3) are combined into bonding eyeglass, opening direction is towards camera-side.
4. the doubly telecentric tight shot according to any one of claims 1 to 3, it is characterised in that: the material that second single positive spheric glass (2) uses is low dispersion.
5. doubly telecentric tight shot according to claim 1, it is characterised in that: after described 5th single negative spheric glass (5) is combined into bonding eyeglass with the 6th list just spheric glass (6), opening direction is back to camera-side.
6. doubly telecentric tight shot according to claim 1, it is characterised in that: described doubly telecentric tight shot satisfies the following conditional expression: NA
= 0.022 TTL=180mm T≤0.025°；Wherein NA is lens opening value, and TTL is the optics total length of camera lens, and T is the telecentricity of camera lens.
7. doubly telecentric tight shot according to claim 1, it is characterised in that: described doubly telecentric tight shot satisfies the following conditional expression:
f/f1= 0.112 f1=
123.1 mm；
f/f2= 0.045
f2=49.59mm；
f/f3=-0.038
f3=-42.26mm；
f/f4=-0.093
f4=-102.56mm；
f/f5=0.01
f5=-11.94mm；
f/f6=0.015
f6=16.04mm；
f/f7=0.026
f7=29.18mm；
Wherein f is the effective focal length of camera lens, f1 is the focal length of first single positive spherical lens, f2 is the focal length of second single positive spherical lens, f3 is the focal length of the 3rd single negative spherical lens, f4 is the focal length of the 4th single negative spherical lens, f5 is the focal length of the 5th single negative spherical lens, and f6 is the focal length of the 6th single positive spherical lens, and f7 is the focal length of the 7th single positive spherical lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510162603.6A CN106154517B (en) | 2015-04-08 | 2015-04-08 | Doubly telecentric tight shot |
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| CN201510162603.6A CN106154517B (en) | 2015-04-08 | 2015-04-08 | Doubly telecentric tight shot |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108802974A (en) * | 2018-09-05 | 2018-11-13 | 浙江舜宇光学有限公司 | Optical image microscope group |
| CN108802971A (en) * | 2018-06-11 | 2018-11-13 | 福建福光股份有限公司 | A kind of low distortion machine vision optical system |
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| CN202281857U (en) * | 2011-11-04 | 2012-06-20 | 广州长步道光电科技有限公司 | Double telecentric lens |
| CN103472574A (en) * | 2013-09-16 | 2013-12-25 | 中国科学院上海光学精密机械研究所 | Photoetching projection objective with variable conjugate distance and photoetching method |
| CN204613499U (en) * | 2015-04-08 | 2015-09-02 | 广州长步道光电科技有限公司 | Two heart tight shot far away |
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| JP4187311B2 (en) * | 1998-07-09 | 2008-11-26 | マミヤ・デジタル・イメージング株式会社 | Medium telephoto lens |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802971A (en) * | 2018-06-11 | 2018-11-13 | 福建福光股份有限公司 | A kind of low distortion machine vision optical system |
| CN108802971B (en) * | 2018-06-11 | 2020-09-11 | 福建福光股份有限公司 | Low-distortion machine vision optical system |
| CN108802974A (en) * | 2018-09-05 | 2018-11-13 | 浙江舜宇光学有限公司 | Optical image microscope group |
| WO2020047906A1 (en) * | 2018-09-05 | 2020-03-12 | 浙江舜宇光学有限公司 | Optical image lens set |
| CN108802974B (en) * | 2018-09-05 | 2023-05-09 | 浙江舜宇光学有限公司 | Optical image lens assembly |
| US11966011B2 (en) | 2018-09-05 | 2024-04-23 | Zhejiang Sunny Optical Co., Ltd | Optical imaging lens assembly |
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Effective date of registration: 20211118 Address after: 410116 workshop 101, building 1, Jinhai Industrial Park, 177 Jinhai Road, Yuhua District, Changsha City, Hunan Province Patentee after: HUNAN CHIOPT OPTICAL TECHNOLOGY Co.,Ltd. Address before: 511442 2nd floor, No.1 Workshop, Jinshan Industrial Park, pengdizhuang, lirendong village, Nancun Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU CHIOPT OPTOTECH Co.,Ltd. |