CN105954860A - One-key measurement bi-telecentric lens - Google Patents
One-key measurement bi-telecentric lens Download PDFInfo
- Publication number
- CN105954860A CN105954860A CN201610317660.1A CN201610317660A CN105954860A CN 105954860 A CN105954860 A CN 105954860A CN 201610317660 A CN201610317660 A CN 201610317660A CN 105954860 A CN105954860 A CN 105954860A
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- lens
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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
- G02B13/22—Telecentric objectives or lens systems
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
Abstract
The invention relates to a one-key measurement bi-telecentric lens, which comprises a mechanical assembly and an optical assembly arranged in the mechanical assembly, and is characterized in that the mechanical assembly comprises a front lens set, a middle lens set and a rear lens set, and the front lens set, the middle lens set and the rear lens set are coaxially connected in a threaded mode; the optical assembly comprises a first front lens, a second front lens, a middle glued piece, a first rear lens, a second rear lens and a third rear lens, the first front lens and the second front lens are arranged in the front lens set, the middle glued piece is arranged in the middle lens set, and the first rear lens, the second rear lens and the third rear lens are arranged in the rear lens set in sequence; and a diaphragm is further arranged between the middle glued piece and the first rear lens. According to the one-key measurement bi-telecentric lens, images are kept to always have stable multiplying power and view field in the process of image acquisition, the change of the view field of the whole lens is not affected by certain change of the object distance, and the reality degree of the images is not changed when the object distance changes in the depth of field; and the maximum distortion at the edge of the whole view field can also be controlled within 0.1%. The one-key measurement bi-telecentric lens has the characteristics of simple structure and convenient use.
Description
Technical field
The invention belongs to industrial machine vision technique field, relate to one-touch measurement doubly telecentric camera lens.
Background technology
The general optical lens problem that imaging viewing field and multiplying power change when object distance changes.General optical lens is owing to can design on light focusing uneven with system primary optical axis to the imaging target surface of whole system by system by the problem of optical system imaging for the satisfied light beyond camera lens clear aperature scope during design of Optical System.So, when camera lens object distance changes, visual field and the enlargement ratio of camera lens will follow change accordingly.This situation can cause the most serious problem during the use of industrial detection especially commercial measurement, needs the strictest each optical engineer of guarantee by after good for Image Adjusting, uses environment to change, such as, carry, shift, the impact such as vibrations.Once environment changes, and camera lens original visual field multiplying power can change, and accuracy of detection just cannot ensure, to continue to ensure that the use of precision is accomplished by professional optical technology personnel and peopleware re-scales, affects the most very much work efficiency.
The general optical lens depth of field is the least.General optical lens due to adjustable in view of the clear aperature adjusting camera lens when design of Optical System, camera lens object distance and the factor such as multiplying power is adjustable.The depth of field depth bounds of lens optical system is the least.In general industrial detection or measurement, if the part of design itself has big height fall, such as gear, cutter head, etc. part, if whole part is detected, typically the mode of multistation can be used to adopt figure to improve precision, so needing to install multiple camera, camera lens, light source etc., the most not only precision to be separately controlled, and the hardware and software cost of whole detection will be the highest.Later stage there will be the probability of problem and also can increase.
The composite factor of general optical lens aberration balancing can be a lot, so cause camera lens to be unable to reach the balance of optimal imaging effect.The aberration of camera lens is the process balanced each other when design, general camera lens is because range is broad, designer's each side balance when all can be weighed, image quality cannot be adjusted to most preferably by optical texture the most own, is so unable to reach a good imaging effect when doing industrial detection.
General optical lens, because marginal incident ray and primary optical axis have the reason of bigger drift angle, needs to ensure camera lens and the perpendicularity of workpiece during shooting workpiece.If perpendicularity cannot ensure, camera lens and workpiece just have shade in various degree along the angular regions of optical axis included angle and produce.If user uses black and white, camera does dimensional measurement, then be difficult to find the edge contour of workpiece, such certainty of measurement just cannot ensure during taking gray-scale map.
Summary of the invention
Present invention aims to the deficiency that above-mentioned existing detection method exists, one-touch measurement doubly telecentric camera lens is proposed, ensure to remain that image has stable multiplying power and visual field during whole collection image, certain change of object distance does not interferes with the change of whole camera lens visual field, and when object distance changes in the depth of field, the validity of image will not change；Can also be aberration control maximum for whole field of view edge in the range of 0.1%；There is simple in construction, feature easy to use.
In order to realize foregoing invention purpose, use following detection method:
One-touch measurement doubly telecentric camera lens, including:
One mechanical component, described mechanical component is included front lens group, middle mirror group and rear mirror group, is connected by coaxial threaded between described front lens group, middle mirror group and rear mirror group；
One is arranged at the optical module in mechanical component, described optical module includes the first preposition eyeglass being built in described front lens group and a second preposition eyeglass, the one middle group of glue pellet being built in described middle mirror group, and one be built in described rear mirror group and be arranged in order first after organize eyeglass, organize after second and organize eyeglass after eyeglass and the 3rd；Organize after described middle group of glue pellet and described first between eyeglass and be additionally provided with diaphragm.
The center thickness 17.75-17.85mm of described first preposition eyeglass, the center thickness 9.7-9.8mm of the second preposition eyeglass, the center thickness 8.45-8.55mm of the 3rd glue pellet, the center thickness 11.55-11.65mm of the 4th lens, the center thickness 9.15-9.25mm of the 5th lens, the center thickness 14.65-14.75mm of six-element lens.
Main advantages of the present invention:
The present invention can ensure to remain that image has stable multiplying power and visual field during whole collection image without the debugging of complicated specialty, certain change of object distance does not interferes with the change of whole camera lens visual field, and when object distance changes in the depth of field, the validity of image will not change.
The present invention solves the problem of general camera lens uncontrollable peripheral field distortion, and camera lens originally has uncontrollable and bigger distortion, and the position of distortion and distortion mode are random, so has influence on the judgement of whole image's authenticity；The present invention can be aberration control maximum for whole field of view edge in the range of 0.1%.
Accompanying drawing explanation
In order to be illustrated more clearly that embodiment of the present invention technical scheme, in describing embodiment below, the required accompanying drawing used is briefly described, apparently, the accompanying drawing only present invention in describing below is in order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in p-embodiment or description of the prior art is briefly described, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention；
Fig. 2 is modulated optical transfer curve schematic diagram in the present invention；
Fig. 3 is blur circle scattergram in the present invention；
Fig. 4 is the curvature of field and distortion schematic diagram in the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Reference Fig. 1-4, one-touch measurement doubly telecentric camera lens, including: mechanical component, described mechanical component is divided into three parts, front lens group, middle mirror group, rear mirror group.Connected by coaxial threaded between mirror group.
One is arranged at the optical module in mechanical component, optical module includes first preposition eyeglass 1 and the second preposition eyeglass 2 being built in described front lens group, the one middle group of glue pellet 3 being built in described middle mirror group, and one be built in described rear mirror group and be arranged in order first after organize eyeglass 4, organize after second and organize eyeglass 6 after eyeglass 5 and the 3rd；Organize after described middle group glued and described first between eyeglass and be additionally provided with diaphragm 7.
Eyeglass is fixed in mirror group by the form of threaded ring, spaced apart by optics spacer ring between eyeglass and eyeglass.All of mechanical connection manner is thread forms.
System stop designs between middle group of glue pellet and the 4th group of eyeglass, the center thickness 17.75-17.85mm of described first preposition eyeglass, the center thickness 9.7-9.8mm of the second preposition eyeglass, the center thickness 8.45-8.55mm of the 3rd glue pellet, the center thickness 11.55-11.65mm of the 4th lens, the center thickness 9.15-9.25mm of the 5th lens, the center thickness 14.65-14.75mm of six-element lens
First preposition eyeglass is the ZF50 that Chengdu is bright, second lens is the ZF6 of Chengdu light, 3rd glue pellet 1 is the H-ZK10L of Chengdu light, 3rd glue pellet 2 is the H-ZF62 of Chengdu light, 4th glue pellet 1 is the H-LAF1 of Chengdu light, 4th glue pellet 2 is the ZF52 of Chengdu light, and the 5th lens are the H-ZF88 of Chengdu light, and the 6th is the H-LAF52 that Chengdu is bright.
Wherein the refractive index of first lens is 1.740770, and abbe number is 27.7679.The refractive index of second lens is 1.755205, and abbe number is 27.5462.The refractive index of the 3rd lens gluing 1 is 1.622094, and abbe number is 56.7260.The refractive index of the 3rd lens gluing 2 is 1.755205, and abbe number is 27.5462.The refractive index of the 4th lens gluing 1 is 1.846669, and abbe number is 23.8275.The refractive index of the 4th lens gluing 2 is 1.693631, and abbe number is 49.2330.The refractive index of the 5th lens is 1.945958, and abbe number is 17.9439.The refractive index of six-element lens is 1.78590, and abbe number is 44.19.
The present invention uses the optical texture of thing side's telecentric beam path and the combination of image space telecentricity road to design the optical system of whole camera lens, the image planes of thing side's telecentricity and the object plane of image space telecentricity overlap at the diaphragm of whole system, and the clear aperature controlling diaphragm meets the telecentricity requirement of whole optical system；
Write afterwards the included angle cosine function of edge chief ray and primary optical axis by control design when, by strengthening the weight of operand EXPP, the weighted value of operand can account for about the 10% of whole weighted value, goes to the position (i.e. the inverse of two interpupillary distances is infinitely small) limiting whole Lens Entrance Pupil and emergent pupil to limit it close to 0 by this operand.Go to control the functional value after whole light enters camera lens and outgoing camera lens, by whole numerical control in the range of deviation 0.1%, ensure the telecentricity requirement of whole system.In the range of ensureing that front lens group light focusing face and focal plane, rear mirror group thing side are spaced in 2mm, determine that the deviation range of conjugate planes is within 2mm before and after whole system, control the size of whole diaphragm clear aperature simultaneously, ensure that the change in 2mm deviation range does not interferes with the stability of whole system.
The telecentricity of whole system controls in the range of 0.05%, the blur circle diameter 0.04mm of camera lens, calculate plus camera lens depth of field 9mm by the object distance of camera lens object distance 263 ± 5mm, whole camera lens in field depth any motive objects away from, < 0.01mm is far smaller than whole camera lens blur circle diameter in the change of the visual field of camera lens.This most whole camera lens at will moves in field depth, and the change of camera lens visual field and multiplying power can be ignored.
Thing side's telecentric structure can ensure that camera lens fixture away from the case of have the bigger depth of field, camera lens only has thing side to be parallel to the light of primary optical axis to converge after the refraction of optical system by diaphragm, thus can ensure that on optical texture object distance depth in the range of 9mm can imaging and distortion less than 0.05%.
Designing optical system when, main consideration is applied in industrial detection.Balancing aberration when, emphasis has weighed distortion and the parameter of blur circle diameter.Visual field, whole optical center is controlled during by optical design, three, the visual field of peripheral field and peripheral field 0.77 times field rays converges in the position of imaging target surface after camera lens, refer to the form that have expressed in Fig. 4 (blur circle scattergram) figure after the light focusing of each field range, light in view of different wave length can occur color poor after camera lens reflects, the optical aberrations such as spherical aberration, use the mode of method of least square to calculate blue light when optimizing, HONGGUANG, the image space of the trichroism optical wavelength of green glow, the position being controlled three road light by the curvature and interval constantly adding parameter optimization eyeglass is overlapped, ensureing that maximum deviation is less than 10 μm. the image quality making camera lens last is optimized to greatest extent, control the blur circle diameter of the last central vision of this system less than 10 μm.
With reference to Fig. 3, this figure is that the camera lens that optical simulation software ZEMAX automatically generates passes letter curve chart, and vertical coordinate represents camera lens light intensity attenuation percentage ratio, and abscissa represents that optical energy attenuation is by frequency.The figure shows the effect distribution that the imaging effect of whole camera lens, i.e. luminous energy are decayed in camera lens.The general quality weighing a lens imaging quality with the height decayed at 30% by frequency, it can be seen that this camera lens at 30% by frequency be 80lp/mm, much higher than cut-off frequency 65lp/mm at similar camera lens 30%.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (1)
- The most one-touch measurement doubly telecentric camera lens, it is characterised in that including:One mechanical component, described mechanical component includes front lens group, middle mirror group and rear mirror group, described front lens group, Connected by coaxial threaded between middle mirror group and rear mirror group；One is arranged at the optical module in mechanical component, and described optical module includes that one is built in described front lens group First preposition eyeglass and the second preposition eyeglass, one is built in middle group of glue pellet, and one of described middle mirror group Be placed in described rear mirror group and be arranged in order first after organize eyeglass, organize after second and organize mirror after eyeglass and the 3rd Sheet；Organize after described middle group of glue pellet and described first between eyeglass and be additionally provided with diaphragm；The center thickness 17.75-17.85mm of described first preposition eyeglass, the center thickness of the second preposition eyeglass 9.7-9.8mm, the center thickness 8.45-8.55mm of the 3rd glue pellet, the center thickness of the 4th lens 11.55-11.65mm, the center thickness 9.15-9.25mm of the 5th lens, the center thickness of six-element lens 14.65-14.75mm。
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| CN201610317660.1A CN105954860A (en) | 2016-05-13 | 2016-05-13 | One-key measurement bi-telecentric lens |
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| CN201610317660.1A CN105954860A (en) | 2016-05-13 | 2016-05-13 | One-key measurement bi-telecentric lens |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441159A (en) * | 2016-12-07 | 2017-02-22 | 西京学院 | Optical fine measurement method based on parallel imaging |
| CN106483642A (en) * | 2016-12-14 | 2017-03-08 | 舜宇光学(中山)有限公司 | A kind of doubly telecentric camera lens based on machine vision |
| CN107238915A (en) * | 2017-04-30 | 2017-10-10 | 西京学院 | One kind disappears veiling glare doubly telecentric optical lens |
| CN109471244A (en) * | 2018-12-27 | 2019-03-15 | 中航华东光电有限公司 | A kind of big visual field doubly telecentric camera lens based on machine vision |
| CN110221396A (en) * | 2019-07-17 | 2019-09-10 | 深圳市沃特隆科技有限公司 | A kind of novel telecentric lens structure |
| CN110262019A (en) * | 2019-07-17 | 2019-09-20 | 深圳市沃特隆科技有限公司 | A kind of coaxial lens construction of telecentricity |
| CN110262018A (en) * | 2019-07-17 | 2019-09-20 | 深圳市沃特隆科技有限公司 | A kind of doubly telecentric lens construction |
| CN110989137A (en) * | 2019-12-20 | 2020-04-10 | 东莞市普密斯精密仪器有限公司 | Double-telecentric lens |
| CN111443451A (en) * | 2020-05-25 | 2020-07-24 | 深圳市沃特隆科技有限公司 | 360-degree shooting outer lens for camera external connection and use method thereof |
| CN112946849A (en) * | 2021-02-02 | 2021-06-11 | 深圳市视清科技有限公司 | Telecentric optical system lens |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106441159A (en) * | 2016-12-07 | 2017-02-22 | 西京学院 | Optical fine measurement method based on parallel imaging |
| CN106483642A (en) * | 2016-12-14 | 2017-03-08 | 舜宇光学(中山)有限公司 | A kind of doubly telecentric camera lens based on machine vision |
| CN107238915A (en) * | 2017-04-30 | 2017-10-10 | 西京学院 | One kind disappears veiling glare doubly telecentric optical lens |
| CN109471244B (en) * | 2018-12-27 | 2021-05-25 | 中航华东光电有限公司 | Large-view-field double-telecentric lens based on machine vision |
| CN109471244A (en) * | 2018-12-27 | 2019-03-15 | 中航华东光电有限公司 | A kind of big visual field doubly telecentric camera lens based on machine vision |
| CN110221396A (en) * | 2019-07-17 | 2019-09-10 | 深圳市沃特隆科技有限公司 | A kind of novel telecentric lens structure |
| CN110262019A (en) * | 2019-07-17 | 2019-09-20 | 深圳市沃特隆科技有限公司 | A kind of coaxial lens construction of telecentricity |
| CN110262018A (en) * | 2019-07-17 | 2019-09-20 | 深圳市沃特隆科技有限公司 | A kind of doubly telecentric lens construction |
| CN110989137A (en) * | 2019-12-20 | 2020-04-10 | 东莞市普密斯精密仪器有限公司 | Double-telecentric lens |
| CN110989137B (en) * | 2019-12-20 | 2022-03-11 | 东莞市普密斯精密仪器有限公司 | Double-telecentric lens |
| CN111443451A (en) * | 2020-05-25 | 2020-07-24 | 深圳市沃特隆科技有限公司 | 360-degree shooting outer lens for camera external connection and use method thereof |
| CN112946849A (en) * | 2021-02-02 | 2021-06-11 | 深圳市视清科技有限公司 | Telecentric optical system lens |
| CN112946849B (en) * | 2021-02-02 | 2022-08-12 | 深圳市视清科技有限公司 | Telecentric optical system lens |
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