CN101726248B - Position detecting method of roller imaging surface and device thereof - Google Patents
Position detecting method of roller imaging surface and device thereof Download PDFInfo
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- CN101726248B CN101726248B CN200910110010XA CN200910110010A CN101726248B CN 101726248 B CN101726248 B CN 101726248B CN 200910110010X A CN200910110010X A CN 200910110010XA CN 200910110010 A CN200910110010 A CN 200910110010A CN 101726248 B CN101726248 B CN 101726248B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 2
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Abstract
The invention relates to a position detecting method of a roller imaging surface and a device thereof. The device comprises a main lens, a fixed platform and a roller, wherein an auxiliary light path assembly is arranged on the lens, and an auxiliary measuring beam emitted by the auxiliary light path assembly is parallel to a roller focus tangent plane and is focused on a focus of an imaging beam; a photocell is arranged on the platform and receives the light energy of the auxiliary measuring beam emitted by the auxiliary light path assembly, and the size of the photocell satisfies a focus servo dynamic range; and the photocell is connected with a biasing circuit. Because a focused measuring beam is adopted by the invention to direct detect the position of the roller imaging surface, the device has ultra-high detection sensitivity. An experimental result indicates that a focus error is a sub-micron grade in the state of high-speed dynamic tracking, thereby completely satisfying the tracking precision requirement of a direct plate making machine to the focus.
Description
Technical field
The invention belongs to the scanning imagery equipment of cylinder class, like optical draught machine, laser photocomposing machine, the direct optical imaging system of platemaking machine is used for the position probing of imaging surface.
Background technology
In cylinder class scanning imagery equipment, generally need laser beam be pooled the point that matees with resolution.For example in optical draught machine, resolution can be up to 20000DPI (per inch 20000 points), and this moment, the imaging point distance had only 1.27 μ m, and the picture point diameter should be about 1.8 μ m.The process lens that at this moment need adopt big numerical value aperture mirror is to improve imaging resolution.In addition, in direct platemaking machine, need lens to converge quite high laser energy, at this moment also need adopt the process lens of large-numerical aperture.
The process lens of large-numerical aperture all has only very short depth of focus without exception.For example in direct platemaking machine as number formulary value aperture between 0.5-0.55, depth of focus at this moment has only 1-2 μ m, the maintenance of the adjustment of this focusing and imaging process focal length has all proposed high requirement.
In cylinder image scanning structure, no matter cylindricity, the bearing turn error of cylinder surface, or the linearity of scanning platform guide rail all are difficult to the accuracy class that reaches such.Therefore, in optical draught machine and direct platemaking machine, especially be necessary to adopt automatic focusing, or focal length is called for short " focal length is servo " from the motion tracking servomechanism.
In the focal length servo-drive system, the most important thing is detection to image planes.The scheme that detects image planes has multiple, have based on graphical analysis, has pneumatically supportedly, and useful auxiliary beam is done range of triangle.This wherein have because of structure and principle reason can not be used for direct process lens, the dynamic response that has is not enough, the distance accuracy that also has is undesirable.The auxiliary beam of employing triangle telemetry is for example arranged, and it is except the optical texture complicacy, and distance accuracy is 5 μ m, and is also not ideal enough.
Summary of the invention
The image planes measurement scheme that the present invention proposes, being based on roller imaging surface is this design feature of cambered surface, adopts a subsidiary laser beam, along the tangent line direct detection of the cylinder image planes focus position as the plane.The subsidiary laser beam generally has different wavelengths with imaging laser, adopts the 830nm wavelength like thermographic, and this moment, secondary laser beams adopted the wavelength of 650nm, and both energy differ greatly, can not cause plate sensitization.Auxilliary survey measuring beam can adopt the collimation parallel beam of narrow beam, also can adopt focused beam, and the latter has narrow dynamic range and high detection sensitivity.
Concrete technical scheme is:
A kind of method for detecting position of roller imaging surface, it has a subsidiary laser beam, and said subsidiary laser beam has different wavelengths with imaging laser, and both energy differ very big;
Said subsidiary laser beam is parallel with cylinder focus section, and focuses on the focus of imaging beam;
There is photoelectric cell said subsidiary laser beam corresponding position; Said photoelectric cell is connected with biasing circuit; Should receive only the portion of energy of said subsidiary laser beam at camera lens with the said photoelectric cell of dynamic equilibrium state, this value Ip is by said biasing circuit adjustment conversion;
Bias current is Ib, and said subsidiary laser beam switching current is Ip,
If Ip=Ib, the servo dynamic balance state that is in of focal length, principal focal distance is correct;
If Ip＞Ib, principal focal distance is away from Jiao, and servo circuit will promote camera lens 2 servo-actuated that moves to left through motor;
If Ip＜Ib, the nearly out of focus of principal focal distance, servo circuit will promote camera lens 2 servo-actuated that moves to right through motor.
A kind of preferred version of subsidiary laser beam is: the collimation parallel beam that said subsidiary laser beam is a narrow beam.
The another kind of preferred version of subsidiary laser beam is: said subsidiary laser beam is a focused beam.
Should receive only half energy of said subsidiary laser beam with the said photoelectric cell of dynamic equilibrium state at camera lens.
A kind of position detecting device of roller imaging surface, it comprises main lens, stationary platform and cylinder, said main lens is connected on the said stationary platform through line slideway;
Said cylinder is fixed on the stationary platform, and said camera lens is connected with servo motor;
The auxiliary optical path assembly is arranged on the said camera lens, and the subsidiary light beam that said auxiliary optical path assembly sends is parallel with said cylinder focus section, and focuses on the focus of imaging beam;
On the said platform photoelectric cell is arranged, receive the luminous energy of the subsidiary light beam that said auxiliary optical path assembly sends, said photronic size satisfies the servo dynamic range of focal length;
Said photoelectric cell is connected with biasing circuit.
Said auxiliary optical path assembly comprises laser diode, diaphragm, focus lamp, reflecting prism.
Therefore the present invention has high detection sensitivity owing to adopt the position that focuses on measuring beam direct detection cylinder image planes.Experimental result shows that under high speed dynamic tracking state, focus error is inferior μ m level, can satisfy the tracking accuracy requirement of direct platemaking machine focusing fully.
Description of drawings
Fig. 1 is an embodiment of the invention structural representation;
Fig. 2 is embodiment of the invention biasing circuit figure.
Embodiment
Below through embodiment the present invention is described, should be noted that, cited embodiment should not understand to the invention restriction.
Explain this programme in conjunction with Fig. 1.
With dynamic equilibrium state, photoelectric cell 6 should receive only the portion of energy of measuring beam 7 at camera lens, and is for example half the.This value can be set by the biasing circuit adjustment.Referring to Fig. 2.
If bias current is Ib, the switching current of measuring beam is Ip, if Ip=Ib then shows the servo dynamic balance state that is in of focal length, principal focal distance is correct;
If Ip＞Ib, then show principal focal distance away from Jiao, servo circuit will promote camera lens 2 servo-actuated that moves to left through voice coil motor;
If Ip＜Ib, then show the nearly out of focus of principal focal distance, servo circuit will promote camera lens 2 servo-actuated that moves to right through voice coil motor.
Therefore the present invention has high detection sensitivity owing to adopt the position that focuses on measuring beam direct detection cylinder image planes.Experimental result shows that under high speed dynamic tracking state, focus error is inferior μ m level, can satisfy the tracking accuracy requirement of direct platemaking machine focusing fully.
Obviously, foregoing is just in order to explain characteristics of the present invention, and is not limitation of the present invention, and the variation that the those of ordinary skill in relevant technologies field is made in the corresponding techniques field according to the present invention should belong to protection category of the present invention.
Claims (6)
1. the method for detecting position of a roller imaging surface, it is characterized in that: this detection method adopts a subsidiary laser beam, and said subsidiary laser beam has different wavelengths with imaging laser, and both energy differ very big;
Said subsidiary laser beam is parallel with cylinder focus section, and focuses on the focus of imaging beam;
There is photoelectric cell said subsidiary laser beam corresponding position; Said photoelectric cell is connected with biasing circuit; Should receive only the portion of energy of said subsidiary laser beam at camera lens with the said photoelectric cell of dynamic equilibrium state, this value Ip is by said biasing circuit adjustment conversion;
Bias current is Ib, and said subsidiary laser beam switching current is Ip,
If Ip=Ib, the servo dynamic balance state that is in of focal length, principal focal distance is correct;
If Ip＞Ib, servo circuit will promote camera lens 2 servo-actuated that moves to left through motor;
If Ip＜Ib, servo circuit will promote camera lens 2 servo-actuated that moves to right through motor.
2. the method for detecting position of a kind of roller imaging surface according to claim 1, its characteristic also is: the collimation parallel beam that said subsidiary laser beam is a narrow beam.
3. the method for detecting position of a kind of roller imaging surface according to claim 1, its characteristic also is: said subsidiary laser beam is a focused beam.
4. the method for detecting position of a kind of roller imaging surface according to claim 1, its characteristic also is: half energy that should receive only said subsidiary laser beam at camera lens with the said photoelectric cell of dynamic equilibrium state.
5. implement the pick-up unit of the method for detecting position of the arbitrary described a kind of roller imaging surface of claim 1-4, it is characterized in that: it comprises main lens, stationary platform and cylinder, and said main lens is connected on the said stationary platform through line slideway;
Said cylinder is fixed on the stationary platform, and said main lens is connected with servo motor;
The auxiliary optical path assembly is arranged on the said main lens, and the subsidiary laser beam that said auxiliary optical path assembly sends is parallel with said cylinder focus section, and focuses on the focus of imaging beam;
On the said platform photoelectric cell is arranged, receive the luminous energy of the subsidiary laser beam that said auxiliary optical path assembly sends, said photronic size satisfies the servo dynamic range of focal length;
Said photoelectric cell is connected with biasing circuit.
6. pick-up unit according to claim 5, its characteristic also is: said auxiliary optical path assembly comprises laser diode, diaphragm, focus lamp and reflecting prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910110010XA CN101726248B (en) | 2009-11-06 | 2009-11-06 | Position detecting method of roller imaging surface and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910110010XA CN101726248B (en) | 2009-11-06 | 2009-11-06 | Position detecting method of roller imaging surface and device thereof |
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| CN101726248A CN101726248A (en) | 2010-06-09 |
| CN101726248B true CN101726248B (en) | 2012-02-22 |
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| CN200910110010XA Active CN101726248B (en) | 2009-11-06 | 2009-11-06 | Position detecting method of roller imaging surface and device thereof |
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| CN106406048A (en) * | 2016-11-25 | 2017-02-15 | 深圳市东方宇之光科技股份有限公司 | Resolution ratio switching method for drum imaging and device thereof |
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Address after: The cedar building industry in Guangdong province Shenzhen City Tairan 518000 Futian District Shatou Street Tairan Industrial Zone 5 floor A block 5C1 Patentee after: SHENZHEN EAST SPACE LIGHT TECHNOLOGY CO.,LTD. Address before: 518054 Guangdong city of Shenzhen province Nanshan District Nanyou Cheonan Industrial District 2 Building 8 Patentee before: SHENZHEN EAST SPACE LIGHT ELECTRONIC TECHNOLOGY Co.,Ltd. |
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Addressee: SHENZHEN EAST SPACE LIGHT TECHNOLOGY CO.,LTD. Person in charge of patents Document name: payment instructions |
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Addressee: SHENZHEN EAST SPACE LIGHT TECHNOLOGY CO.,LTD. Person in charge of patents Document name: Notice of Termination of Patent Rights |