CN101620398B - Imaging device and method for detecting exposed image deviation of exposure head - Google Patents
Imaging device and method for detecting exposed image deviation of exposure head Download PDFInfo
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- CN101620398B CN101620398B CN2008100680993A CN200810068099A CN101620398B CN 101620398 B CN101620398 B CN 101620398B CN 2008100680993 A CN2008100680993 A CN 2008100680993A CN 200810068099 A CN200810068099 A CN 200810068099A CN 101620398 B CN101620398 B CN 101620398B
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Abstract
The invention discloses an imaging device and a method for detecting exposed image deviation of an exposure head. The imaging device comprises a movement mechanism for bearing an imaging surface, and the exposure head for exposing the imaging surface through a modulated light beam corresponding to image information of a picture to be imaged, wherein the movement mechanism is also provided with an image sensor used for converting a detection light beam emitted by the exposure head on a position corresponding to the installation position of the image sensor into a corresponding electrical signal so as to determine exposed image deviation information of the exposure head. The imaging device and the method for detecting the exposed image deviation of the exposure head have the advantages of simple realization and high accuracy.
Description
Technical field
The present invention relates to imaging device, relate in particular to the method for the exposure image deviation of imaging device with exposure image deviation measuring ability and relevant detection photohead.
Background technology
In Computer To Plate (Computer To Plate is called for short CTP) system, platemaking equipment generally adopts computer-controlled laser scanning or array exposure image.
At present, generally include several photoheads in the imaging device of employing scanning type exposure technology, it sends the modulated beam of light corresponding with the image information for the treatment of image imaging surface is exposed.Reasons such as error owing to processing, installation and system itself, can not guarantee fully that the actual exposure position when each photohead exposes to imaging surface all can conform to the ideal position at the beginning of the design, the actual exposure position that is presumable photohead can deviation occur with respect to ideal position, this makes and defectives such as striated even distortion may occur in the image after the imaging, has a strong impact on the quality of imaging.
For addressing the above problem, publication number is to disclose a kind of exposure device in the patented claim of CN1677244A, exposure method and bearing calibration, this scheme is in the exposure of view data, read based on reading mechanism and to be positioned on the photosensitive material as the reference mark of the benchmark of exposure position and the reference position data that obtain, carry out the exposure aligning of modulated beam of light, and from the relative position relation of light-beam position testing agency with respect to the reading mechanism reference mark, the exposure station position data of the modulated beam of light that detects based on obtained reference position data and light-beam position testing agency is come the exposure image data.
In research and practice process to prior art, the present inventor finds, reading mechanism and the light-beam position testing agency exposure station position with detection reference mark and modulated beam of light need be set in exposure device in the above-mentioned prior art, and need in exposure process, carry out exposure aligning as light beam, could realize proofreading and correct because the imaging problem that deviation caused of the exposure position of photohead based on a large amount of complex process such as reference position data and exposure station position data exposure image data, therefore implement more complicated, the possibility that produces error is also bigger.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the invention provides imaging device with exposure image deviation measuring ability and the method that detects the exposure image deviation of photohead, to reach the purpose that detects exposure image deviation simply, exactly.
A kind of imaging device comprises motion that carries imaging surface and the photohead that described imaging surface is exposed by the modulated beam of light corresponding with the image information for the treatment of image, wherein:
Image sensor also is installed on described motion, being used for the detection Beam Transformation that described photohead sends at the installed position corresponding to described image sensor is corresponding electric signal, to determine the exposure image deviation information of described photohead, described electric signal is loaded with the positional information and the area information of exposed image;
Described image sensor is installed in the depression that is provided with on the described motion;
The light-sensitive surface of described image sensor and described imaging surface are tangent.
A kind of method that detects the exposure image deviation of photohead comprises:
Make tested photohead send the detection light beam at the installed position corresponding to image sensor, wherein said image sensor is installed on the motion of carrying imaging surface;
Described image sensor is corresponding electric signal with described detection Beam Transformation, and to determine the exposure image deviation information of described photohead, described electric signal is loaded with the positional information and the area information of exposed image;
Described image sensor is installed in the depression that is provided with on the described motion;
The light-sensitive surface of described image sensor and described imaging surface are tangent.
In the embodiment of the invention, image sensor directly is installed on the motion of carrying imaging surface, and make photohead send the detection light beam at installed position corresponding to image sensor, like this, the electric signal of exporting based on the detection light beam according to image sensor promptly can directly obtain the exposure image deviation information of photohead.Owing to only need image sensor is installed on motion simply, and do not need to be provided with in addition reading mechanism and light-beam position testing agency, therefore compared with prior art, the embodiment of the invention has and realizes simple, the high advantage of accuracy.
Description of drawings
Fig. 1 is the three-dimensional structure diagram of imaging device embodiment of the present invention;
Fig. 2 is the floor map of imaging device embodiment of the present invention;
Fig. 3 is the scheme of installation of image sensor among the imaging device embodiment of the present invention.
Embodiment
Below the preferred embodiment of imaging device of the present invention with the method for the exposure image deviation that detects photohead is elaborated.
Referring to figs. 1 to Fig. 3, imaging device embodiment of the present invention comprises:
Right cylinder imaging drum 201, place the imaging surface that is covered with photosensitive material 202 on right cylinder imaging drum 201 outside surfaces, be used to clamp and be fixed into the clamp bar 203,204 of image planes 202, also comprise being used for driving the motor 206 of right cylinder imaging drum 201 along its axis 205 rotations (figure represents with Y), and the rotary encoder that is used to obtain the anglec of rotation of right cylinder imaging drum 201.
The imaging device of present embodiment also comprises control module, and control module comprises image processing module and output interface; Wherein image processing module be used to produce be used to control the exposure of laser imaging device branch as subimage, output interface is used for exporting the exposure control signal of determining as subimage according to branch separately in real time to each laser imaging device.
The image-forming principle of above-mentioned imaging device is: image processing module will treat that image carries out the branch picture processing on the directions X, form a plurality of branches as subimage, formed a plurality of branches are related one by one with photohead 212 as subimage, make each photohead finish the exposure image of associated pixel region respectively.In exposure device, optics splits beam system single bundle original laser that laser instrument produces is split into multi beam, multiple laser after the division is corresponding one by one with above-mentioned photohead continuous on the position, wherein each laser imaging device waits to expose the exposure control signal of pixel according to the output of the output interface of control module, the laser beam that is input to this photohead is modulated, the feature such as bright dark of the energy/intensity that makes the laser beam after the modulation and the described pixel of waiting to expose conforms to, light beam after the modulation focuses on the back along the direction perpendicular to the bulging axis 205 of right cylinder imaging through the imaging eyeglass again, shine on the imaging surface 202, finish single exposure.Drive rotatablely move (in the figure Y direction) of imaging surface 202 by right cylinder imaging drum 201 along its axis 205, in conjunction with the rectilinear motion of above-mentioned exposure device along directions X, finish exposure to all pixels in the pixel region behind minute picture, the exposed image that each photohead forms on imaging surface is stitched together, and forms the described complete exposed image for the treatment of image.
In the actual imaging process, because the influence of processing, installation and systematic error, deviation may appear in the more satisfactory situation of actual exposure image that photohead forms on imaging surface, thereby causes the image after the imaging to produce various defectives.In the present embodiment, be to detect the exposure image deviation of photohead 212, also be equipped with on right cylinder imaging drum 201 and each photohead 212 image sensor 207 one to one, the position of image sensor 207 can be arranged between clamp bar 203 and 204.As shown in Figure 3, for making the image sensor 207 after the installation consistent with photohead 212 with respect to the distance of imaging surface 202 with the distance of 212 of photoheads, the position that image sensor 207 can be installed on right cylinder imaging drum 201 is provided with depression (for example can be groove), image sensor 207 is installed in the depression of corresponding position, and makes the upper surface C of the light-sensitive surface B of image sensor 207 and imaging surface 202 tangent.
Structure according to the embodiment of the invention, when needs detect the exposure image deviation of photohead, can drive exposure device by straight-line motion mechanism 211 moves on directions X, each photohead is moved to and its corresponding position of corresponding image sensor, in this position, make photohead send the detection light beam image sensor is exposed, image sensor can be corresponding electric signal with detecting Beam Transformation, determines the exposure image deviation of photohead with this.For instance, because the time with the exposure of the corresponding position of image sensor, the detection light beam of each photohead can arrive the center position of image sensor in theory, and the shape of the hot spot that forms on image sensor and area also all should meet theoretical the requirement.Yet, if skew appears in the installation of photohead, when for example on mounting plane, skew occurring perpendicular to the direction of the emission light beam of photohead, the detection light beam of photohead can be offset, thereby the center of image sensor also can be departed from the position of the exposed image that image sensor detected, perhaps, when photohead deviation occurred with respect to the focal length of imaging surface, the area of the exposed image that image sensor detected also deviation can occur.Therefore, by the electric signal of image sensor output, just can determine the exposure image deviation of photohead.
As can be seen, in the embodiment of the invention, image sensor directly is installed on the motion of carrying imaging surface, and make photohead send the detection light beam at installed position corresponding to image sensor, like this, the electric signal of exporting based on the detection light beam according to image sensor promptly can directly obtain the exposure image deviation of photohead.Owing to only need image sensor is installed on motion simply, and do not need to be provided with in addition reading mechanism and light-beam position testing agency, therefore compared with prior art, the embodiment of the invention has and realizes simple, the high advantage of accuracy.
In the imaging device of present embodiment, on right cylinder imaging drum 201, also be provided with the plugged interface 230 that is connected with image sensor 207, this interface can be arranged on the end face of right cylinder imaging drum 201, when detecting, described right cylinder imaging drum 201 does not rotate, lead can be inserted this interface 210 and power to give image sensor 207, and the electric signal after the conversion of transmission image sensor.After detection is finished, the External cable that is connected with joint 210 is disconnected, so just can not have influence on the motion of right cylinder imaging drum in imaging process.
In the above-described embodiment, on right cylinder imaging drum, install and a plurality of one to one image sensors of photohead, understandable, in more embodiment of the present invention, also an image sensor can only be installed, when detecting, each photohead moved to successively with the corresponding position of this image sensor get final product.
In the above-described embodiments, adopt the motion of right cylinder imaging drum as the carrying imaging surface, understandable, in the more embodiment of the present invention, imaging surface is carried in drum-type mechanism or platform-type mechanism in also can adopting.
In the above-described embodiments, the type of image sensor can be CCD or CMOS.
In the more embodiment of the present invention, the electric signal by the output of the plugged interface on the right cylinder imaging drum 201 directly can be presented on the screen, like this, the maintainer can adjust the installation of photohead according to this displaying contents.In addition, also electric signal and the theoretical value of image sensor output can be compared, determine the exposure image deviation information of photohead after, the exposure control information of photohead is adjusted accordingly, thereby realization is to the correction of photohead exposure image deviation.
In the more embodiment of the present invention, also touching, optoelectronic induction, electromagnetic induction or the wireless radio transmission interface that can be connected with image sensor 207 in the end face setting of described right cylinder imaging drum 201, be used for transmitting described electric signal by the lead that inserts this interface, when described right cylinder imaging drum 201 is done continuous rotational motion, described image sensor can detect in real time to the image-forming information of photohead, and realizes the real-time Transmission of signal by above-mentioned interface.
The present invention also provides the embodiment of the method for the exposure image deviation that detects photohead, and this embodiment method comprises:
Make tested photohead send the detection light beam corresponding to the position of image sensor, wherein said image sensor is installed on the motion of carrying imaging surface; And,
Described image sensor is corresponding electric signal with described detection Beam Transformation, to determine the exposure image deviation information of described photohead.
Wherein, described image sensor is installed in the depression (as groove) that is provided with on the described motion.
Wherein, the light-sensitive surface of described image sensor and described imaging surface are tangent.
In said method embodiment, described photohead, image sensor, motion etc. can have the individual features among the imaging device embodiment of the present invention.
More than imaging device that the embodiment of the invention provided and the method that detects the exposure image deviation of photohead are described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. imaging device, comprise the motion that carries imaging surface and by the modulated beam of light corresponding with the image information for the treatment of image to the photohead that described imaging surface exposes, it is characterized in that:
Image sensor also is installed on described motion, being used for the detection Beam Transformation that described photohead sends at the installed position corresponding to described image sensor is corresponding electric signal, to determine the exposure image deviation information of described photohead, described electric signal is loaded with the positional information and the area information of exposed image;
Described image sensor is installed in the depression that is provided with on the described motion;
The light-sensitive surface of described image sensor and described imaging surface are tangent.
2. device as claimed in claim 1 is characterized in that, comprises a plurality of photoheads in the described imaging device, and an image sensor only is installed on described motion.
3. device as claimed in claim 1 is characterized in that, comprises a plurality of photoheads in the described imaging device, and is equipped with on described motion and a plurality of one to one image sensors of described a plurality of photoheads.
4. as claim 1 or 2 or 3 described devices, it is characterized in that, described motion is provided with the touching, optoelectronic induction, electromagnetic induction, the wireless radio transmission interface that are connected with described image sensor, maybe can plugs interface, is used for transmitting described electric signal by the lead that inserts this interface.
5. as claim 1 or 2 or 3 described devices, it is characterized in that the type of described motion specifically is platform-type mechanism, drum type mechanism or interior drum-type mechanism.
6. a method that detects the exposure image deviation of photohead is characterized in that, comprising:
Make tested photohead send the detection light beam at the installed position corresponding to image sensor, wherein said image sensor is installed on the motion of carrying imaging surface;
Described image sensor is corresponding electric signal with described detection Beam Transformation, and to determine the exposure image deviation information of described photohead, described electric signal is loaded with the positional information and the area information of exposed image;
Described image sensor is installed in the depression that is provided with on the described motion;
The light-sensitive surface of described image sensor and described imaging surface are tangent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100680993A CN101620398B (en) | 2008-06-30 | 2008-06-30 | Imaging device and method for detecting exposed image deviation of exposure head |
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| CN2008100680993A CN101620398B (en) | 2008-06-30 | 2008-06-30 | Imaging device and method for detecting exposed image deviation of exposure head |
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| CN101620398A CN101620398A (en) | 2010-01-06 |
| CN101620398B true CN101620398B (en) | 2011-12-07 |
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| CN104406774B (en) * | 2014-12-07 | 2017-01-25 | 矽卓光电技术（天津）有限公司 | CTP full-automatic calibration aging system and implementation method thereof |
| JP6870308B2 (en) * | 2016-12-15 | 2021-05-12 | ブラザー工業株式会社 | Image forming device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5717451A (en) * | 1994-09-08 | 1998-02-10 | Matsushita Graphic Communication Systems, Inc. | Positioning system for multihead type image recording apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5717451A (en) * | 1994-09-08 | 1998-02-10 | Matsushita Graphic Communication Systems, Inc. | Positioning system for multihead type image recording apparatus |
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| JP特开2002-350769A 2002.12.04 |
| JP特开2002-67388A 2002.03.05 |
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Address after: 518051 Dazu laser building, 9 new West Road, North Nanshan District high tech park, Shenzhen, Guangdong Patentee after: HANS LASER TECHNOLOGY INDUSTRY GROUP CO., LTD. Address before: No. 5 road 518057 in Guangdong province Shenzhen city Nanshan District high tech park of Pine Hill Factory District No. 8 Patentee before: Dazu Laser Sci. & Tech. Co., Ltd., Shenzhen |
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