CN204650056U - A kind of two telecentric optics camera lens - Google Patents
A kind of two telecentric optics camera lens Download PDFInfo
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- CN204650056U CN204650056U CN201520257230.6U CN201520257230U CN204650056U CN 204650056 U CN204650056 U CN 204650056U CN 201520257230 U CN201520257230 U CN 201520257230U CN 204650056 U CN204650056 U CN 204650056U
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Abstract
The utility model discloses a kind of two telecentric optics camera lens, comprising: a mechanical component, described mechanical component includes front lens group, middle mirror group and rear mirror group, is connected between described front lens group, middle mirror group and rear mirror group by coaxial threaded; One is arranged at the optical module in mechanical component, described optical module comprises the first preposition eyeglass and the second preposition eyeglass that is built in described front lens group, the one middle group of glue pellet being built in described middle mirror group, and one is built in described rear mirror group and the be arranged in order first rear arrangement of mirrors sheet, arrangement of mirrors sheet after arrangement of mirrors sheet and the 3rd after second; Also diaphragm is provided with between arrangement of mirrors sheet after described middle group of glue pellet and described first.Ensure in the process of whole collection image, remain that image has stable multiplying power and visual field, certain change of object distance can not have influence on the change of whole camera lens visual field; There is structure simple, feature easy to use.
Description
Technical field
The utility model relates to for industrial machine visual field, is specifically related to a kind of two telecentric optics camera lens, can mates the industrial cameras such as 35mm camera and 2K, 4K, 6K.
Background technology
The general optical lens problem that imaging viewing field and multiplying power change when object distance changes.General optical lens due to can by the problem of optical system imaging in order to meet the light exceeding camera lens clear aperature scope during Optical System Design, by system by with the uneven light focusing of system primary optical axis on the imaging target surface of whole system.Like this, when camera lens object distance changes, the visual field of camera lens and enlargement ratio correspondingly will follow change.This situation can cause very serious problem in the use procedure of industrial detection especially commercial measurement, and after needing very strict guarantee each optical engineer that Image Adjusting is good, environment for use can not change, such as, carry, be shifted, the impact such as vibrations.Once environment changes, 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 just needs the optical technology personnel of specialty and peopleware again to demarcate, so very affects work efficiency.
The general optical lens depth of field is very little.General optical lens is adjustable owing to considering the clear aperature of adjustment camera lens when Optical System Design, camera lens object distance and the factor such as multiplying power is adjustable.The depth of field depth range of lens optical system is very little.In general industrial detection or in measuring, if the part of design itself has large height fall, such as gear, cutter head, etc. part, if will detect whole part, generally the mode of multistation can be adopted to adopt figure to improve precision, need like this to install multiple camera, camera lens, light source etc., so not only precision will separately control, and the hardware and software cost of whole detection will be very high.The probability that later stage there will be problem also can increase.
The composite factor of general optical lens aberration balancing can be a lot, cause camera lens cannot reach the balance of optimal imaging effect like this.The aberration of camera lens is the process balanced each other when designing, general camera lens is because usable range is broad, designer's each side when balance all can be weighed, therefore image quality cannot be adjusted to the best by optical texture own, cannot reach a good imaging effect like this when doing industrial detection.
General optical lens, because marginal incident ray and primary optical axis have the reason of larger drift angle, needs the verticality ensureing camera lens and workpiece during shooting workpiece.If verticality cannot ensure, the shade that camera lens and workpiece just have in various degree along the angular regions of optical axis included angle produces.If user uses black and white, camera does dimensional measurement, and so get in the process of gray-scale map the edge contour being just difficult to find workpiece, such measuring accuracy just cannot ensure.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of two telecentric optics camera lens, ensure in the process of whole collection image, remain that image has stable multiplying power and visual field, certain change of object distance can not have influence on the change of whole camera lens visual field, and when object distance changes in the depth of field, the validity of image can not change; Also can aberration control maximum for whole field of view edge in 0.1% scope; There is structure simple, feature easy to use.
For achieving the above object, the technical solution of the utility model is as follows:
A kind of two telecentric optics camera lens, comprising:
One mechanical component, described mechanical component includes front lens group, middle mirror group and rear mirror group, is connected between described front lens group, middle mirror group and rear mirror group by coaxial threaded;
One is arranged at the optical module in mechanical component, described optical module comprises the first preposition eyeglass and the second preposition eyeglass that is built in described front lens group, the one middle group of glue pellet being built in described middle mirror group, and one is built in described rear mirror group and the be arranged in order first rear arrangement of mirrors sheet, arrangement of mirrors sheet after arrangement of mirrors sheet and the 3rd after second; Also diaphragm is provided with between arrangement of mirrors sheet after described middle group of glue pellet and described first.
In a preferred embodiment of the present utility model, the center thickness of described first preposition eyeglass is 15.95-16.05mm, the center thickness of the second preposition eyeglass is 8.95-9.05mm, the center thickness of the 3rd preposition eyeglass is 21.55-22.65mm, after described first, the center thickness of arrangement of mirrors sheet is 16.85-16.95mm, after second, the center thickness of arrangement of mirrors sheet is 9.15-9.25mm, and after the 3rd, the center thickness of arrangement of mirrors sheet is 14.65-14.75mm.
In a preferred embodiment of the present utility model, described middle group glue pellet is formed by two lens gummeds.
In a preferred embodiment of the present utility model, be interposed between within the scope of 1-2mm between described front lens group light focusing face and rear mirror group object space focal plane, to meet the stability of system.
By technique scheme, the beneficial effects of the utility model are:
The utility model can ensure in the process of whole collection image, remain that image has stable multiplying power and visual field without the need to the debugging of complicated specialty, certain change of object distance can not have influence on the change of whole camera lens visual field, and when object distance changes in the depth of field, the validity of image can not change.
The utility model solves the problem of the uncontrollable peripheral field distortion of general camera lens, and camera lens originally has uncontrollable and larger distortion, and the position of distortion and distortion mode are random, has influence on the judgement of whole image's authenticity like this; The utility model can aberration control maximum for whole field of view edge in 0.1% scope.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present utility model;
Fig. 2 is fundamental diagram of the present utility model.
Fig. 3 is MTF of the present utility model (modulated optical transfer curve) schematic diagram.
Fig. 4 is blur circle distribution plan of the present utility model.
Fig. 5 is curvature of field schematic diagram of the present utility model.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the utility model further.
See figures.1.and.2, a kind of two telecentric optics camera lens, comprising: 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 comprises the first preposition eyeglass 1 and the second preposition eyeglass 2 that is built in described front lens group, the one middle group of glue pellet 3 being built in described middle mirror group, and one is built in described rear mirror group and the rear arrangement of mirrors sheet 5 of the be arranged in order first rear arrangement of mirrors sheet 4, second and the 3rd rear arrangement of mirrors sheet 6; Diaphragm 7 is also provided with between arrangement of mirrors sheet after described middle group of gummed and described first.
Eyeglass is fixed in mirror group by the form of threaded ring, spaced apart by optics spacer ring between eyeglass and eyeglass.All mechanical connection manners are thread forms.
System stop design is between middle group of glue pellet and the 4th arrangement of mirrors sheet, the center thickness 15.95-16.05mm of the first preposition eyeglass, the center thickness 8.95-9.05mm of the second preposition eyeglass, the center thickness 21.55-22.65mm of middle group of glue pellet, the center thickness 16.85-16.95mm of arrangement of mirrors sheet after first, the center thickness 9.15-9.25mm of arrangement of mirrors sheet after second, the center thickness 14.65-14.75mm of arrangement of mirrors sheet after the 3rd.
First preset lens sheet material is the H-ZKL11 of Chengdu light, the material of the second preposition eyeglass is the H-ZBAF3 of Chengdu light, middle group of glue pellet is formed by two lens gummeds, the material of the first lens of glue pellet is the H-ZK10L of Chengdu light, the material of second lens of glue pellet is the H-ZF62 of Chengdu light, after first, the material of arrangement of mirrors sheet is the H-LAF52 of Chengdu light, after second, the material of arrangement of mirrors sheet is the H-LAF52 of Chengdu light, and after the 3rd, the material of arrangement of mirrors sheet is the H-LAF52. of Chengdu light
Wherein the refractive index of the first preposition eyeglass is 1.638543, and abbe number is 55.471523.The refractive index of the second preposition eyeglass is 1.656913, and abbe number is 51.128080.The refractive index of the first lens of glue pellet is 1.622802, and abbe number is 56.951885.The refractive index of second lens of glue pellet is 1.92286, and abbe number is 20.88.After first, the refractive index of arrangement of mirrors sheet is 1.785901, and abbe number is 44.206711.After second, the refractive index of arrangement of mirrors sheet is 1.785901, and abbe number is 44.206711.After 3rd, the refractive index of arrangement of mirrors sheet is 1.785901, and abbe number is 44.206711.
The optical texture that the utility model adopts object space telecentric beam path and image space wit far away to combine designs the optical system of whole camera lens, the image planes of the object space heart far away and the object plane of the image space heart far away overlap at the diaphragm place of whole system, and the clear aperature controlling diaphragm meets the telecentricity requirement of whole optical system;
When design by controlling the included angle cosine function of writing afterwards edge chief ray and primary optical axis, by strengthening the weight of operand EXPP, the weighted value of operand can account for about 10% of whole weighted value, goes to the position (namely 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 whole light enter camera lens and outgoing camera lens after functional value, by whole Numerical Control in the scope of deviation 0.1%, ensure the telecentricity requirement of whole system.Ensure to be interposed between within the scope of 2mm between front lens group light focusing face and rear mirror group object space focal plane, determine that the deviation range of conjugate plane before and after whole system is within 2mm, control the size of whole diaphragm clear aperature simultaneously, ensure that the change in 2mm deviation range can not have influence on the stability of whole system.
The telecentricity of whole system controls in 0.05% scope, the blur circle diameter 0.04mm of camera lens, add camera lens depth of field 9mm to calculate by the object distance of camera lens object distance 263 ± 5mm, whole camera lens is any motive objects distance in field depth, the change <0.01mm of the visual field of camera lens, is far smaller than whole camera lens blur circle diameter.This that is whole camera lens at will movement in field depth, the change of camera lens visual field and multiplying power can be ignored.
Object space telecentric structure can ensure that camera lens has the larger depth of field when fixture distance, the light that camera lens only has object space to be parallel to primary optical axis converges by diaphragm after the refraction of optical system, thus can ensure on optical texture the depth of object distance within the scope of 9mm can imaging and distortion be less than 0.05%.
When design optical system, main consideration is applied in industrial detection.When balance aberration, emphasis has weighed the parameter of distortion and blur circle diameter.By controlling visual field, whole optical center during optical design, three, the visual field field rays of peripheral field and peripheral field 0.77 times converges in the position of imaging target surface after camera lens, the form after the light focusing of each field range can be have expressed with reference in figure tetra-(blur circle distribution plan) figure, consider that the light of different wave length aberration can occur after camera lens refraction, the optical aberrations such as spherical aberration, use the mode of least square method to calculate blue light when optimizing, ruddiness, the image space of green glow three coloured light wavelength, the position being controlled three road light by the curvature and interval of 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, the blur circle diameter controlling the last central vision of this system is less than 10 μm.
Reference Fig. 3, this figure are that the camera lens that optical simulation software ZEMAX generates automatically passes letter curve map, and ordinate represents camera lens light intensity attenuation number percent, and horizontal ordinate represents that optical energy attenuation is by frequency.The figure shows the imaging effect of whole camera lens, the effect that namely luminous energy is decayed in camera lens distributes.The quality of a lens imaging quality is weighed by the height of frequency by general decay 30% place, can see this camera lens 30% place by frequency be 80lp/mm, higher than similar camera lens 30% place cutoff frequency 65lp/mm a lot.
Fig. 4 is blur circle distribution plan of the present utility model; Fig. 5 is curvature of field schematic diagram of the present utility model.Therefore this camera lens has very outstanding image analysis ability.
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. a two telecentric optics camera lens, is characterized in that, comprising:
One mechanical component, described mechanical component includes front lens group, middle mirror group and rear mirror group, is connected between described front lens group, middle mirror group and rear mirror group by coaxial threaded;
One is arranged at the optical module in mechanical component, described optical module comprises the first preposition eyeglass and the second preposition eyeglass that is built in described front lens group, the one middle group of glue pellet being built in described middle mirror group, and one is built in described rear mirror group and the be arranged in order first rear arrangement of mirrors sheet, arrangement of mirrors sheet after arrangement of mirrors sheet and the 3rd after second; Also diaphragm is provided with between arrangement of mirrors sheet after described middle group of glue pellet and described first.
2. the two telecentric optics camera lens of one according to claim 1, it is characterized in that, the center thickness of described first preposition eyeglass is 15.95-16.05mm, the center thickness of the second preposition eyeglass is 8.95-9.05mm, the center thickness of the 3rd preposition eyeglass is 21.55-22.65mm, after described first, the center thickness of arrangement of mirrors sheet is 16.85-16.95mm, and after second, the center thickness of arrangement of mirrors sheet is 9.15-9.25mm, and after the 3rd, the center thickness of arrangement of mirrors sheet is 14.65-14.75mm.
3. the two telecentric optics camera lens of one according to claim 1, is characterized in that, described middle group of glue pellet is formed by two lens gummeds.
4. the two telecentric optics camera lens of one according to claim 1, is characterized in that, be interposed between within the scope of 1-2mm, to meet the stability of system between described front lens group light focusing face and rear mirror group object space focal plane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520257230.6U CN204650056U (en) | 2015-04-26 | 2015-04-26 | A kind of two telecentric optics camera lens |
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| CN201520257230.6U CN204650056U (en) | 2015-04-26 | 2015-04-26 | A kind of two telecentric optics camera lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777595A (en) * | 2015-04-26 | 2015-07-15 | 西安远心光学系统有限公司 | Bi-telecentric optical lens |
| CN105404081A (en) * | 2015-12-28 | 2016-03-16 | 广州独眼巨人光学科技有限公司 | Mobile phone external optical lens |
| CN107238915A (en) * | 2017-04-30 | 2017-10-10 | 西京学院 | One kind disappears veiling glare doubly telecentric optical lens |
-
2015
- 2015-04-26 CN CN201520257230.6U patent/CN204650056U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777595A (en) * | 2015-04-26 | 2015-07-15 | 西安远心光学系统有限公司 | Bi-telecentric optical lens |
| CN105404081A (en) * | 2015-12-28 | 2016-03-16 | 广州独眼巨人光学科技有限公司 | Mobile phone external optical lens |
| CN107238915A (en) * | 2017-04-30 | 2017-10-10 | 西京学院 | One kind disappears veiling glare doubly telecentric optical lens |
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