CN203293634U - Optical focus temperature compensating device - Google Patents
Optical focus temperature compensating device Download PDFInfo
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- CN203293634U CN203293634U CN2013200909072U CN201320090907U CN203293634U CN 203293634 U CN203293634 U CN 203293634U CN 2013200909072 U CN2013200909072 U CN 2013200909072U CN 201320090907 U CN201320090907 U CN 201320090907U CN 203293634 U CN203293634 U CN 203293634U
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Abstract
The utility model relates to a moving optical imaging system, and provides an optical focus temperature compensating device. The optical focus temperature compensating device comprises an optical imaging lens group, a solid matter optical fiber matrix, a multi-path controllable monochrome phase dry light source, a light source controller, a measuring instrument for determining the image distance between an optical imaging system and an information carrier surface, an automatic control mobile platform, as well as a printing plate exposure carrier provided with an adhering information carrier, wherein the optical imaging lens group, the solid matter optical fiber matrix, the multi-path controlled monochrome phase dry light source, the light source controller, the measuring instrument, the automatic control mobile platform and the printing plate exposure carrier are all provided with temperature sensors. The optical focus temperature compensating device provided by the utility model mainly aims at the influence of the compensation temperature rise change on the imaging quality in an operation process of optical imaging equipment.
Description
Technical field
The utility model relates to mobile optical imaging system, and a kind of optical focal length temperature compensation means is provided.
Background technology
At computer master making, (as film setter, CTP, CTCP or ID digital printer), when optical imaging system on information carrier during scanning imagery, distance between optical imaging system and information carrier surface, requirement will remain unanimously, and very accurate, to obtain good image quality.Distance between this optical imaging system and information carrier surface, be called image distance, and people also are commonly called as the focusing focal length into optical imaging system.Each optical imaging system has a definite image distance, and image quality the best under this image distance, before and after this image distance of determining, in certain scope, image quality descends to some extent, but can also approve for people, before and after this image distance of determining, the passable scope of picture element is called the depth of field.In general, the variation of the actual image distance of optical imaging system, in field depth, can obtain satisfied image quality.
For film setter, CTP or ID digital printer, in order to guarantee the accurate uniformity of image distance, in the processing of ray machine part, the fit on of parts, maximum effort has all been done by manufacturer.As information carrier surface around the jerk value of rotation, the linearity of optical imaging system scanning motion, the interior variation to information carrier surface of optical imaging system scanning total travel, etc. the technical indicator of multinomial key, all accomplished 1/2nd or 1/3rd of field depth, even less.Therefore optical-mechanical system has met under the standard environment condition, obtains the requirement of satisfied image quality.
But in the equipment operation process, environment temperature may change, and device interior power supply, motor, light source, mechanical friction all can produce a large amount of heats, makes the parts of equipment produce the temperature rise distortion.Different materials, the temperature rise distortion is different, can cause the variable in distance between optical imaging system and information carrier surface, even exceeds field depth, causes the decline of image quality.
US Patent No. 5,765,272 have introduced a kind of autofocus system for laser imaging apparatus.this system has laser and is used to form the optics of light beam, described light beam is focused onto on imaging plane, the laser characteristics that reflects from imaging plane, by a photodiode, received, the laser characteristics signal of this reflection has comprised the information (size of focus point) of laser beam focus state on imaging plane, comparison by this information and theoretical optimal value, draw the optics of laser and imaging and the focus state relation between imaging plane, and the position of optics that can be by changing laser and imaging, change the focus of laser beam on imaging plane.
Its feedback of such autofocus system is from imaging plane, and imaging plane is the forme surface especially, is not proper plane, and there is the male and fomale(M&F) of microcosmic on surface, can cause improper reflection.And the forme surface that corresponds to reality has the dust granule existence, also can cause improper reflection.Improper reflection can cause feedback distortion.Moreover this autofocus system states, and is mainly very for the impact of the vibration in the equipment operation process on focusing on.But the vibration equipment frequency is higher, and the control time that the mechanical location of autofocus system is adjusted is relatively long, and cut, is poor post-compensation, image defects therefore easily occur.The autofocus system design difficulty of the type is large simultaneously, and the complicated cost of hardware configuration is high.
The patent 01119950.4 of Heidelberg, have laser imaging apparatus and the method for variable printed dot size.Its foothold still will be very for, vibration in the equipment operation process is set out on the impact that focuses on focus, utilization has the laser beam of Gaussian Energy Distribution, when optical system focuses on, the waist Shu Xianxiang that forms, with laser range finder, measure the actual range of lasing light emitter to imaging surface, the size of the laser energy that computerizeds control and the length of time for exposure are carried out the variation of compensating focusing focus.
Such automatic focus focus bucking-out system, can only be used to the laser beam of Gaussian Energy Distribution is arranged, can not be for not having the converging beam of Gaussian Energy Distribution, (as the light beam of coupling fiber output).LDMS itself is also that a design difficulty is large, the higher equipment of the complicated cost of hardware configuration.
Summary of the invention
The utility model is mainly in the optical imaging apparatus operation process, and the compensation temperature rise changes the impact on image quality, thereby a kind of optical focal length temperature compensation means is provided.
The utility model is to achieve these goals by the following technical solutions:
A kind of optical focal length temperature compensation means is characterized in that: comprise the controlled monochromatic coherent source of optical imaging lens group, solid matter fiber matrix, multichannel, light source controller, the measurement instrument of determining image distance between the relative information carrier surface of optical imaging system, the automatic control mobile platform that are provided with temperature sensor, the forme exposure of adhering to information carrier carrier is provided.
In such scheme, described automatic control mobile platform is provided with platform and controls motor.
In such scheme, also comprise the base that bearing optical imaging system and forme exposure carrier are provided, described automatic control mobile platform is arranged on base, and described optical imaging lens group, solid matter fiber matrix are arranged on the automatic control mobile platform.
In such scheme, described platform is controlled motor and is provided with step actuator.
The utlity model has following beneficial effect:
The utility model is mainly in the optical imaging apparatus operation process, and the compensation temperature rise changes the impact on image quality.
The accompanying drawing explanation
Fig. 1 is the utility model structural representation.
In figure 1 for forme exposure carrier, 2 be the optical imaging lens group, 3 for the solid matter fiber matrix, 4 for step actuator, 5 for the controlled monochromatic coherent source of multichannel, 6 for the automatic control mobile platform, 7 for platform control motor, 8 for temperature sensor, 9 for base, 10 be that microswitch, 11 is optoelectronic switch.
The specific embodiment
The utility model is mainly in the optical imaging apparatus operation process, and the compensation temperature rise changes the impact on image quality.
The utility model is on the basis of great many of experiments and calculating, for a certain specific optical imaging apparatus, under different environmental conditions, measure light, mechanical, electrical parts separately the temperature rise change curve relevant with optical imagery, computation induction goes out the functional relation of the temperature rise of each parts to the image distance variable effect.Temperature rise numerical value according to each parts, and to the functional relation of image distance variable effect, distance between robot control system(RCS) automated movement optical imaging system and information carrier surface, the compensation temperature rise changes the impact on image quality, reaches the purpose of stablizing the optimal imaging quality.
In order to realize the purpose of this utility model, provide and have the optical imaging system of information carrier surface parallel relatively, this system comprises: the optical imaging lens group, the image source of imaging, the controlled monochromatic coherent source of multichannel, light source controller, determine the measurement instrument of image distance between the relative information carrier surface of optical imaging system, automatic control mobile platform.The forme exposure of adhering to information carrier carrier is provided.The base of bearing optical imaging system and forme exposure carrier is provided.Above-mentioned each parts should have temperature sensor.The image source of described imaging is the solid matter fiber matrix.
In order to realize the purpose of this utility model, need measuring:
1. curve and the function of temperature rise on controlled monochromatic coherent source light energy output impact;
The complex amplitude transmitance of grating G is
In formula: q is the cycle of grating.
Air refraction is n under the impact of environment temperature, and under paraxial condition, according to Fresnel approximation, by the Talbot effect, the light distribution of grating back is
I(x,z)?=?A0
2?+?2?A1
2?+4?A0?A1?cos?[2π(f-s)λ(z+f-s)?]×cos[2qnz(z+f-s)]
In formula: I is lens to be measured; F is the focal length of lens; A0, A1 are two Ronchi gratings; With Weixy plane, grating A1 plane, the vertical raster plane is optical axis z axle (z=0 is in focal plane); Lens to be measured are s to the distance of grating A1; The air refraction screen of λ for simplifying, its refractive index n (x, y, z) is the change at random with the temperature of air only; Q be n while being constant directional light incide grating G1, the Moire fringe width that G2 produces.
2. the imaging lens group is passed through because of high-energy light, the eyeglass that brings and the temperature rise curve of lens barrel structure spare, the affect relational expression of temperature rise on the optical imaging system optical parametric;
With upper routine function, be combined, when satisfied (f-s) (z+f-s)/during z=knq2/ λ (k is integer), grating A has the Tal2bot picture, this moment, the Talbo distance was
d1=kn(f?-s)q2/[knq2+(f-s)λ]
The Talbot picture of A0 and A1 form Moire fringe, and the grid line angle of two gratings is θ, and very little (being about 0.001 ° of order of magnitude), thus cos θ ≈ 1, sin θ ≈ 2sin (θ/2), striped to the included angle of y reference axis is
sinφ=2[(f-s)/d1-1]sin(θ/2)
When the focal length of lens to be measured is very large (f > 10m), according to the variation of Moire fringe corner φ, can obtain the formula of reduction of the focal length of lens to be measured
f?=s+(wd2/q)tanφ
In formula: w be n while being constant directional light incide grating A0, the Moire fringe width that A1 produces; D is the Talbot distance of n when directional light incides grating G1 while being constant.
3. imaging system structure platform size is for curve and the relational expression of temperature rise; Exposure carrier structure size is for curve and the relational expression of temperature rise; The physical dimension relevant to imaging system is for curve and the relational expression of temperature rise;
In formula: L is the image distance value; σ is the optical axis angular errors; μ is that optical axis is to the bus perpendicularity; L is the image distance after being out of shape; η is the image height after being out of shape; R is the luminous point spacing; θ is optical axis corner value.
By calculating, the dimensions of mechanical structures variation varies with temperature not obvious, and the image height that it brings and image distance change all less than 1 millimeter.
4. gather and calculate the functional relation of above-mentioned all parts temperature rise variation on the impact of optical imaging system image distance, write corresponding auto-compensation program.
F=F
0+F
△=F
0+?Ft×T
△
On the optical imaging apparatus of a certain specific model, the material of above-mentioned each parts, physical dimension are constant, therefore on the optical imaging apparatus of same specific model, do the experimental test of several, according to test the data obtained and theoretical calculated data, compare, temperature rise curve and the functional relation of concluding, should be with general meaning and accuracy.
In the general assembly debugging of equipment, by (23 ℃ ± 2 ℃ of strict standard environment conditions, relative humidity 45%～55%) (forme center and camera lens dead in line, forme surface and distance of camera lens are 27 ± 0.2mm), make image quality the best above-mentioned each parts to be adjusted to optimum state.By under the standard environment condition, the adjustment parameter of above-mentioned each parts input automatic program, input automatic program by the parameter of the much information carrier that will use.
When above-mentioned each parts oneself itself, and relation each other, the variation of following temperature rising and while changing, image distance also changes thereupon.Temperature sensor on each parts, the variation of temperature rise is in time passed to the computer of equipment, the auto-compensation program can be according to the variations in temperature by on each parts, calculate compensation rate, pass through robot control system(RCS), drive the automatic control mobile platform, adjust the distance between optical imaging system and information carrier surface, reach best image distance.
When the information carrier that uses changes, the auto-compensation program can be according to the information of computer and information carrier sensor, calculate compensation rate, pass through robot control system(RCS), drive the automatic control mobile platform, adjust the distance between optical imaging system and information carrier surface, reach the best image distance after change best information carrier.
Claims (4)
1. optical focal length temperature compensation means, it is characterized in that: comprise the optical imaging lens group that is provided with temperature sensor, the solid matter fiber matrix, the controlled monochromatic coherent source of multichannel, light source controller, determine the measurement instrument of image distance between the relative information carrier surface of optical imaging system, the automatic control mobile platform, the forme exposure of adhering to information carrier carrier is provided, also comprise the base that bearing optical imaging system and forme exposure carrier are provided, described automatic control mobile platform is arranged on base, described optical imaging lens group, the solid matter fiber matrix is arranged on the automatic control mobile platform.
2. a kind of optical focal length temperature compensation means according to claim 1 is characterized in that: described automatic control mobile platform is provided with platform and controls motor.
3. a kind of optical focal length temperature compensation means according to claim 1 and 2, is characterized in that: also comprise the base that bearing optical imaging system and forme exposure carrier are provided.
4. a kind of optical focal length temperature compensation means according to claim 2 is characterized in that: described platform is controlled motor and is provided with step actuator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200909072U CN203293634U (en) | 2013-02-28 | 2013-02-28 | Optical focus temperature compensating device |
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|---|---|---|---|
| CN2013200909072U CN203293634U (en) | 2013-02-28 | 2013-02-28 | Optical focus temperature compensating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105323454A (en) * | 2014-07-30 | 2016-02-10 | 光宝电子(广州)有限公司 | Multi-camera image capturing system and image reconstruction compensation method |
| CN112666805A (en) * | 2020-12-30 | 2021-04-16 | 江苏友迪电气有限公司 | Focal length testing method and compensation method |
-
2013
- 2013-02-28 CN CN2013200909072U patent/CN203293634U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105323454A (en) * | 2014-07-30 | 2016-02-10 | 光宝电子(广州)有限公司 | Multi-camera image capturing system and image reconstruction compensation method |
| CN105323454B (en) * | 2014-07-30 | 2019-04-05 | 光宝电子(广州)有限公司 | Polyphaser image capture system and image reorganization compensation method |
| CN112666805A (en) * | 2020-12-30 | 2021-04-16 | 江苏友迪电气有限公司 | Focal length testing method and compensation method |
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Granted publication date: 20131120 Termination date: 20170228 |
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