JP2006071737A - Compensating apparatus for printing slippage in color image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compensating apparatus for a printing slippage in a color image forming apparatus which automatically compensates the printing slippage at high precision by being applied to the color image forming apparatus. <P>SOLUTION: The compensating apparatus for the printing slippage in printing of the color image comprises: a printing part 23 for printing a printing slippage detection line for two or more reference lines each printed at a pitch set beforehand according to pattern data for each color forming the color image; slippage amount detection means consisting of reading parts 241Y, 241M and 241C for yellow, magenta and cyan detecting the slippage amount against the reference lines in the printing slippage detection lines which are printed by the printing means 23 and slippage amount detection parts 242Y, 242M and 242C for yellow, magenta and cyan ; and a compensating means consisting of compensation parts 243Y, 243M and 243C for yellow, magenta and cyan compensating in the direction of eliminating the slippage amount in the printing part 23 by the detecting output of the slipping amount detection means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a color image forming print misalignment correction apparatus applied to a color image forming apparatus that forms an image based on image data for each color by printing an image on paper.

  Conventionally, as a color image forming apparatus, for example, a drum unit having a photosensitive drum that forms an independent color toner image for each color is used. Such a drum unit is detachable for maintenance inspection, repair, etc., and it is difficult to keep the mounting position constant. In addition, it is difficult to make the mounting position of the drum unit high because of mechanical accuracy in production. For this reason, the drawing position of each color on the paper is shifted, and the images of the respective colors are not superposed well. Therefore, there is a problem that a color shift occurs in the color image and a high-quality color image cannot be formed.

  Therefore, in order to solve the above-described problems, for example, a printing deviation amount determination method shown in Patent Document 1 below has been proposed. According to the pattern data, a plurality of reference lines are printed at a pitch set to each other, and a plurality of print deviation detection lines are printed at a pitch different from the reference line. Of each reference line and each print deviation detection line, The amount of printing deviation is determined based on the positions of the reference line and the printing deviation detection line aligned on a straight line, and this determination is made by visual observation by an operator. Then, the operator corrects the printing deviation based on the printing deviation amount manually determined by the visual inspection.

  Also, in a color image forming apparatus using a transfer belt, the drawing position for each color may be shifted on the paper as described above. For this reason, an ID sensor is installed in the middle of the transfer belt, and the drawing position of the printed test pattern is recognized by the ID sensor to detect the deviation amount. Then, the misregistration is corrected by the detected amount so as to eliminate the misregistration in the subsequent transfer to the recording paper.

JP-A-8-262829 (paragraphs [0002], [0007], [0017], [0018], [0025] to [0034])

  However, the prior art in Patent Document 1 has a problem that the amount of printing deviation cannot be accurately grasped because it is visually observed. In particular, for example, in a color image forming apparatus capable of high-resolution printing in which 1 dot is 1/600 inch or more, which has been on the market in recent years, it is impossible to visually discriminate the printing deviation. In addition, in the case of a color such as yellow in which it is difficult to visually recognize the pattern itself, it is difficult to accurately discriminate printing deviation even if the resolution is not high. For this reason, the prior art is not suitable for correcting printing misalignment. In particular, in high-resolution printing, there is a problem in that it is impossible to accurately determine the printing misalignment.

  Further, in the conventional method for recognizing the drawing position of the test pattern by arranging the ID sensor on the transfer belt described above, the detection position for detecting the shift amount is in the middle of the transfer belt. There is a problem in that it is impossible to correct the deviation that occurs until the transfer of the image. In addition, various parts are arranged at the location where the transfer is performed, and it is difficult to arrange the ID sensor there.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a color image forming print misalignment correction apparatus capable of accurately correcting a print misalignment that has solved the conventional problems.

In order to solve the above-described problem, an invention according to claim 1 of the present application provides a color image forming print misalignment correction apparatus that corrects a print misalignment in printing a color image.
Printing means for printing a print deviation detection line with respect to a plurality of reference lines printed at a preset pitch according to pattern data for each color forming a color image;
Deviation amount detection means (for example, a yellow reading unit 241Y, a magenta reading unit 241M, and a cyan reading unit 241C) that detects, for each color, a deviation amount of the print deviation detection line printed by the printing unit with respect to the reference line. Yellow deviation amount calculation unit 242Y, magenta deviation amount calculation unit 242M, cyan deviation amount calculation unit 242C),
Correction means (for example, a correction unit for yellow 243Y, a correction unit for magenta 243M, a correction unit for cyan) for correcting in a direction to eliminate the shift amount of the printing unit based on the detection output of the shift amount detection unit;
It is characterized by comprising.

  In addition, the invention according to claim 2 of the present application is the color image forming print misalignment correction apparatus according to claim 1, wherein the misalignment detecting means is a reading unit that reads the pattern for each color (for example, for yellow). A reading unit 241Y, a magenta reading unit 241M, and a cyan reading unit 241C), and a deviation amount calculation unit (for yellow) that calculates a deviation amount of the print deviation amount detection line for each color read by the reading unit with respect to the reference line. A deviation amount calculation unit 242Y, a magenta deviation amount calculation unit 242M, and a cyan deviation amount calculation unit 242C).

  The present invention has the following excellent effects by having the above-described configuration. That is, in the invention according to claim 1 of the present application, the printing deviation for each color printed by the printing means is optically detected by the deviation amount detecting means. Then, the printing deviation amount in the printing means is independently corrected for each color by the detection output of the deviation amount detection means. For this reason, since a print misalignment is detected without being visually observed and automatically corrected for each color, it is possible to provide a color misregistration print misalignment correction apparatus that performs highly accurate correction.

  Further, in the invention according to claim 2 of the present application, the deviation amount detection means in claim 1 includes the reading unit and a deviation amount calculation unit, and the pattern printed on the recording paper by the reading unit for each color. Independently optically read and calculates the amount of deviation for each color from the pattern read by the deviation amount calculation unit, so it is possible to automatically calculate print deviation for each color without visual observation, so especially high resolution In this case, it is possible to provide a color misregistration printing misalignment correction apparatus suitable for the case.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiments described below exemplify color image forming print misalignment correction apparatuses for embodying the technical idea of the present invention, and are not intended to specify the present invention. Other embodiments within the scope of the claims are equally applicable.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings with regard to a print misalignment correction apparatus applied to a color image forming apparatus that forms a color image by superimposing yellow, magenta, cyan, and black images. FIG. 1 is an explanatory diagram showing a print misregistration amount determination pattern used in the embodiment of the present invention, FIG. 2 is an explanatory diagram showing an enlarged part of the print misalignment amount determination pattern in FIG. 1, and FIG. It is explanatory drawing which shows the color image forming apparatus to which the printing misalignment correction apparatus for color image formation in the Example of this is applied.

  In FIG. 1, reference numeral 1 denotes a recording sheet for use in detecting a printing deviation amount, and a printing deviation amount determination pattern is printed on the recording sheet 1 by a color image forming apparatus 2 described later. The print deviation amount determination pattern includes three patterns P of yellow, magenta, and cyan printed in series along the sub-scanning direction on the left edge and the right edge of the recording paper 1, and the upper edge of the recording paper 1 and It consists of three patterns P of yellow, magenta, and cyan printed in parallel along the main scanning direction at the lower edge. As shown in FIG. 2, these patterns P are printed misregistration detection lines L0 to L0 with respect to a plurality of reference lines K0 to K10 that are printed at a predetermined pitch for each of yellow, magenta, and cyan according to pattern data. L10 is printed.

  Each pattern P is printed with a symbol indicating the color of the image and the position of the pattern P for which the amount of printing deviation is to be determined. That is, the symbol “Y-L” indicates that the pattern P is formed on the left edge of the recording paper 1 in order to determine the amount of printing deviation in the sub-scanning direction of the image in yellow. The symbol “ML” indicates that the pattern P is formed on the left edge of the recording paper 1 in order to determine the amount of printing deviation in the sub-scanning direction of the image in magenta. The symbol “CL” indicates that the pattern P is formed on the left edge of the recording paper 1 in order to determine the amount of printing deviation in the sub-scanning direction of the image in cyan.

  Further, the symbol “YR” indicates that the pattern P is formed on the right edge of the recording paper 1 in order to determine the amount of printing misalignment of the yellow image in the sub-scanning direction. The symbol “M-R” indicates that the pattern P is formed on the right edge of the recording paper 1 in order to determine the amount of printing deviation in the sub-scanning direction of the image in magenta. The symbol “CR” indicates that the pattern P is formed on the right edge of the recording paper 1 in order to determine the amount of printing deviation in the sub-scanning direction of the image in cyan.

  The symbol “Y-U” indicates that the pattern P is formed on the upper edge of the recording paper 1 in order to determine the amount of printing deviation in the main scanning direction of the image in yellow. The symbol “MU” indicates that the pattern P is formed on the upper edge of the recording paper 1 in order to determine the amount of printing deviation in the main scanning direction of the image in magenta. The symbol “CU” indicates that the pattern P is formed on the upper edge of the recording paper 1 in order to determine the amount of printing deviation in the main scanning direction of the image in cyan.

  Further, the symbol “Y-D” indicates that the pattern P is formed on the lower edge of the recording paper 1 in order to determine the amount of printing misalignment of the yellow image in the main scanning direction. The symbol “MD” indicates that the pattern P is formed on the lower edge of the recording paper 1 in order to determine the amount of printing deviation in the main scanning direction of the image in magenta. The symbol “C-B” indicates that the pattern P is formed on the lower edge of the recording paper 1 in order to determine the amount of printing deviation in the main scanning direction of the image in cyan.

  Next, the details of the pattern P will be described with reference to FIG. This figure shows the symbol “YL”, which is one of the patterns P in the sub-scanning direction, as a representative. When there is no print misalignment between black printing and yellow printing, the print misalignment detection line L0 with respect to the reference line K1 and the pattern data with the print misalignment line L10 aligned with the reference line K10 It has become. When the yellow printing is shifted by one dot in the arrow A direction with respect to the black printing, the print misalignment detection line L9 is pattern data aligned with the reference line K9. When the yellow printing is shifted by one dot in the arrow B direction with respect to the black printing, the print deviation detection line L1 is pattern data aligned with the reference line K2. In this way, a printing deviation amount of 1 dot or more is determined. In the main scanning direction, the amount of printing deviation is determined in the same manner.

  Further, by using the recording paper 1 as shown in FIG. 1, the amount of printing deviation is determined for each color with a pair of patterns on the left edge and the right edge, and the inclination of printing is detected and corrected. It has become. At the same time, the amount of printing deviation is determined for each color with a pair of patterns at the upper edge and the lower edge, and the skew amount of printing is detected and corrected.

  Next, referring to FIG. 3, a printing misalignment correction apparatus applied to a color image forming apparatus that forms a color image by superimposing yellow, magenta, cyan, and black images will be described. The color image forming apparatus 2 includes a scanner 21 that reads image data from a document provided at the top, an operation unit 22 provided below the scanner 21, a printing unit 23 provided below the operation unit 22, and a printing unit 23. Is provided with a print deviation correction unit 24, a paper feeding unit 25 for printing paper provided at the bottom, and a tray 26 provided on the left side.

  The document mounted on the scanner 21 is scanned with image data by the scanner 21 that is operated by an operator's operation in the operation unit 22. The read image data is printed on the paper sent from the paper feeding unit 25 in the printing unit 23. The paper on which the image data is printed is discharged to the tray 26.

  Further, the operation unit 22 is provided with a storage unit 221 for storing pattern data of the print deviation amount determination pattern shown in FIG. 1 and an operation key 222 for correction of print deviation, and pattern data is read from the storage unit 221 by key operation by the operator. Is read out and sent to the printing unit 23 as print data.

  The printing unit 23 adopts a tandem method, and includes a conveyance path 232 formed by the conveyance belt 231, a yellow photosensitive drum 233 </ b> Y, a magenta photosensitive drum 233 </ b> M, and a cyan photosensitive drum provided independently in the conveyance path 232. 233C and the black photosensitive drum 233K, the yellow photosensitive drum 233Y, the magenta photosensitive drum 233M, the cyan photosensitive drum 233C, and the yellow photosensitive drum 233K disposed opposite to the black photosensitive drum 233K, the magenta photosensitive drum 234M, cyan transfer drum 234C, and black transfer drum 234K, a laser drive unit 235 that generates laser light for yellow, magenta, cyan, and black based on the image data, and four generated by the laser drive unit 235. Reflects the laser beam Gon mirror 236, yellow mirror section 237Y disposed between polygon mirror 236 and yellow photosensitive drum 233Y, magenta mirror section 237M disposed between polygon mirror 236 and magenta photosensitive drum 233M, polygon mirror 236 and cyan photosensitive drum 233C, cyan mirror 237C and polygon mirror 236 and black photosensitive drum 233K disposed between black photosensitive drum 233K, yellow developing unit 238Y, and magenta. Development unit 238 </ b> M, cyan development unit 238 </ b> C, and black development unit 238 </ b> K, and a fixing unit 239 disposed on the downstream side of the conveyance path 232.

  The four laser beams independently scan the yellow photosensitive drum 233Y, the magenta photosensitive drum 233M, the cyan photosensitive drum 233C, and the black photosensitive drum 233K, and in response to the laser beams, the yellow developer 238Y. Forms a yellow toner image on the yellow photosensitive drum 233Y, the magenta developer 238M forms a magenta toner image on the magenta photosensitive drum 233M, and the cyan developer 238C on the cyan photosensitive drum 233C. A cyan toner image is formed, and the black developing device 238K forms a black toner image on the black photosensitive drum 233K. These toner images are transferred onto a conveyance path 232 on a yellow photosensitive drum 233Y, a magenta photosensitive drum 233M, a cyan photosensitive drum 233C, a black photosensitive drum 233K, a yellow transfer drum 234Y, a magenta transfer drum 234M, and a cyan. Transfer is performed by the transfer drum 234C for black and the transfer drum 234K for black.

  The print misalignment correction unit 24 is a yellow pattern reading unit 241Y for optically reading, for each color, a print misalignment determination pattern printed on the recording paper 1 disposed on the downstream side of the fixing unit 239 of the printing unit 23. A magenta pattern reading unit 241M and a cyan pattern reading unit 241C, a yellow deviation amount calculating unit 242Y that calculates a deviation amount from a print deviation amount determination pattern obtained by the yellow pattern reading unit 241Y, and a magenta pattern reading unit 241M. The magenta deviation amount calculation unit 242M that calculates the deviation amount from the print deviation amount determination pattern obtained in step 241 and the cyan deviation amount calculation unit that calculates the deviation amount from the print deviation amount determination pattern obtained by the cyan pattern reading unit 241C. 242C and the yellow mirror portion 237 depending on the amount of yellow shift The yellow correction unit 243Y that controls to eliminate the printing deviation by correcting the rotational position of the magenta, and the magenta that controls to eliminate the printing deviation amount by correcting the rotational position of the magenta mirror unit 237M according to the deviation amount of magenta. And a cyan correction unit 243C that controls the rotational position of the cyan mirror unit 237C by using the cyan shift amount so as to eliminate the print shift amount.

  Next, the operation of the image forming apparatus 2 configured as described above will be described with reference to the drawings. When the operator operates the printing misalignment correction operation key 222 to read pattern data from the storage unit 221, the read pattern data is sent to the printing unit 23. In the printing unit 23, the laser driving unit 235 generates laser beams for yellow, magenta, cyan, and black based on the pattern data. These laser beams reach the yellow mirror unit 237Y, the magenta mirror unit 237M, the cyan mirror unit 237C, and the black mirror unit 237K through the polygon mirror 236, respectively. The laser beam reaching the yellow mirror section 237Y scans on the yellow photosensitive drum 233Y. By this scanning, a toner image is formed on the yellow photosensitive drum 233Y by the yellow developing unit 238Y. Similarly, the laser beam reaching the magenta mirror unit 237M scans the magenta photosensitive drum 233M. By this scanning, a toner image is formed on the magenta photosensitive drum 233M by the magenta developer 238M. The laser beam reaching the cyan mirror unit 237C scans on the cyan photosensitive drum 233C. By this scanning, a toner image is formed on the cyan photosensitive drum 233C by the cyan developer 238C. Further, the laser beam reaching the black mirror portion 237K scans on the black photosensitive drum 233K. By this scanning, a toner image is formed on the black photosensitive drum 233K by the black developing unit 238K.

  On the other hand, the recording paper 1 is supplied from the paper supply unit 25 to the transport path 232. First, the black toner image on the black photosensitive drum 233K is transferred onto the recording paper 1 conveyed by the conveying belt 231 by the black transfer drum 234K. Next, the cyan toner image on the cyan photosensitive drum 233C is transferred onto the recording paper 1 by the cyan transfer drum 234C. Next, the magenta toner image on the magenta photosensitive drum 233M is transferred onto the recording paper 1 by the magenta transfer drum 234M. Finally, the yellow toner image on the yellow photosensitive drum 233Y is transferred onto the recording paper 1 by the yellow transfer drum 234Y. After the transfer of all the toner images to the recording paper 1 is completed, the toner image is fixed by the fixing unit 239.

  The recording paper 1 on which the printing deviation amount determination pattern transferred downstream of the fixing unit 239 is printed is printed with the symbols “YL”, “YR”, “YU”, “Y” by the yellow pattern reading unit 241Y. A pattern corresponding to yellow of “Y-B” is read. Next, a pattern corresponding to magenta of symbols “ML”, “MR”, “MU”, and “MB” is read by the magenta pattern reading unit 241M. Further, a pattern corresponding to cyan of symbols “CL”, “CR”, “CU”, and “CB” is read by the cyan pattern reading unit 241C. These yellow, magenta, and cyan patterns are read and processed by optically reading and reading the characters “YL”, “CL”, “ML”... Identification is performed using the collected data. The pattern P corresponding to yellow read by the yellow pattern reading unit 241Y is calculated from the pattern data in which the shift amount detection lines L0 to K10 with respect to the reference lines K0 to K10 are aligned in the yellow shift amount calculation unit 242Y. . This calculation is performed by comparing the image data of the read pattern data with the image data of all the pattern data prepared in advance. For example, when the shift amount detection line L9 of the obtained pattern data is aligned with the reference line L9, this is identified by comparison with the pattern data prepared in advance, and 1 dot in the arrow A direction in the sub-scanning direction. It is calculated that there is a difference. This calculated data is supplied to the yellow correction unit 243Y, and the yellow correction unit 243Y corrects the mirror angle of the yellow mirror unit 237Y by one dot so that the amount of printing deviation is eliminated. Similarly, the amount of deviation between magenta and cyan is detected, and the amount is calculated and corrected.

  The detection of the shift amount is supplied to the yellow correction unit 243Y, the magenta correction unit 243M, and the cyan correction unit 243C, and the mirrors of the yellow mirror unit 237Y, the magenta mirror unit 237M, and the cyan mirror unit 237C are used. It is corrected so as to eliminate the printing misalignment by rotating.

  Similarly, with the pair of patterns P printed on the left and right edges, the amount of printing deviation is detected and calculated independently, and the yellow mirror unit 237Y, the magenta mirror unit 237M, and the cyan mirror unit 237C are detected. A correction is made so that the tilt of printing is eliminated by rotating the mirror. Further, with the pair of patterns P printed on the upper and lower edges, the amount of printing deviation is detected and calculated independently, and the mirror of the yellow mirror unit 237Y, the magenta mirror unit 237M and the cyan mirror unit 237C. Rotate to correct the skew amount.

Therefore, in the above-described embodiment of the present invention, when the image data is read from the document by the scanner 21 and the correction is made so as to eliminate the printing deviation amount before printing, the operator operates the printing deviation correction operation key 222. To do. By this operation, the pattern data stored in the storage unit 221 is read and sent to the printing unit 23. In the printing unit 23, the laser driving unit 235 generates laser light for yellow, magenta, cyan, and black based on the pattern data, and a yellow toner image by the yellow developing unit 238Y is formed on the yellow photosensitive drum 233Y. A magenta toner image is formed on the magenta photosensitive drum 233M by the magenta developer 238M, and a cyan toner image is formed on the cyan photosensitive drum 233C by the magenta developer 238C. A black toner image is formed on the drum 233K by the black developing device 238K. Then, the recording paper 1 is supplied from the paper supply unit 25 to the transport path 232, and first, the black toner image on the black photosensitive drum 233K is transferred onto the recording paper 1 by the black transfer drum 234K. Next, the cyan toner image on the cyan photosensitive drum 233C is transferred onto the recording paper 1 by the cyan transfer drum 234C. The magenta toner image on the magenta photosensitive drum 233M is transferred onto the recording paper 1 by the magenta transfer drum 234M. Finally, the yellow toner image on the yellow photosensitive drum 233Y is transferred onto the recording paper 1 by the yellow transfer drum 234Y. After all the toner images have been transferred and fixed, the yellow pattern reading unit 241Y corresponds to yellow of symbols “YL”, “YR”, “YU”, and “YB”. The pattern to be read is optically read. Next, a pattern corresponding to magenta of symbols “ML”, “MR”, “MU”, and “MB” is read by the magenta pattern reading unit 241M. Furthermore, patterns corresponding to cyan of symbols “CL”, “CR”, “CU”, and “CB” are similarly optically read by the cyan pattern reading unit 241C. When reading these yellow, magenta, and cyan patterns, the characters such as symbols “YL”, “ML”, “CL”,... Attached to the pattern P and the pattern P itself are optically read. .
Therefore, even if the pattern P is printed with high accuracy, it can be read accurately, and even a color that is difficult to read visually such as yellow can be read accurately by using an optical filter.

  The read pattern is subjected to image processing by the yellow shift amount calculation unit 242Y, the magenta shift amount calculation unit 242M, and the cyan shift amount calculation unit 242C, and the electrical shift amount is calculated. Therefore, the yellow correction unit 243Y, the magenta correction unit 243M, and the cyan correction unit 243C rotate the mirrors of the yellow mirror unit 237Y, the magenta mirror unit 237M, and the cyan mirror unit 237C so that there is no deviation amount. For this reason, the printing deviation amount is automatically corrected. Thereafter, the operator can operate the operation unit 22 to print the image data of the original read by the scanner 21 using the printing unit 23 to form image data with no printing deviation on the paper.

  In the above-described embodiment of the present invention, the color image forming apparatus is a tandem system. However, the present invention is not limited to this, and the sheet is formed after a color toner image is superimposed on a single photosensitive drum. The present invention can be applied to various color image forming apparatuses such as a method for transferring to a toner and a method using a transfer belt.

  In the above-described embodiments of the present invention, the color image forming apparatus employs a method of exposing an image by scanning on a photosensitive drum with laser light. However, the present invention is not limited to this, for example, In the case of using a print head such as an ink jet system, the present invention can be applied to various methods such as correcting the position of the print head in accordance with the amount of deviation to correct the print deviation.

  Still further, in the above-described embodiment of the present invention, the pattern P is printed on the left and right edges of the recording paper 1 to detect the printing deviation in the sub-scanning direction, and the pair of patterns P also detects the printing inclination. However, only one set may be printed, and only the printing deviation in that direction may be detected and corrected. In addition, the pattern P is printed on the upper and lower edges of the recording paper 1 to detect not only the printing deviation in the main scanning direction but also the skew amount of printing with a pair of patterns. Only the printing deviation in that direction may be detected and corrected.

FIG. 1 is an explanatory diagram showing a print deviation amount determination pattern used in the embodiment of the present invention. FIG. 2 is an explanatory diagram showing an enlarged part of the print deviation amount determination pattern in FIG. FIG. 3 is an explanatory view showing a color image forming apparatus to which the color image forming print misalignment correcting apparatus in the embodiment of the present invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording paper 2 Color image forming apparatus 21 Scanner 22 Operation part 23 Printing part 24 Printing deviation correction part 25 Paper feeding part 26 Tray 221 Storage part 222 Printing deviation amount correction key 231 Conveying belt 232 Conveying path 233Y Yellow photosensitive drum 233M Magenta Photosensitive drum 233C Cyan photosensitive drum 233K Black photosensitive drum 234Y Yellow transfer drum 234M Magenta transfer drum 234C Cyan transfer drum 234K Black transfer drum 235 Laser drive unit 236 Polygon mirror 237Y Yellow mirror unit 237M Magenta mirror unit 237C Cyan mirror unit 237K Black mirror unit 238Y Yellow developer 238M Magenta developer 238C Cyan developer 238K Black developer 239 Fixing unit 241Y Low pattern reading unit 241M Magenta pattern reading unit 241C Cyan pattern reading unit 242Y Yellow shift amount calculation unit 242M Magenta shift amount calculation unit 242C Cyan shift amount calculation unit 243Y Yellow correction circuit 243M Magenta correction circuit 243C Cyan Correction circuit

Claims (2)

In a color misalignment printing misalignment correction apparatus that corrects misregistration in color image printing,
Printing means for printing a print deviation detection line with respect to a plurality of reference lines printed at a preset pitch according to pattern data for each color forming a color image;
A deviation amount detecting means for detecting, for each color, a deviation amount of the print deviation detection line printed by the printing means with respect to the reference line;
Correction means for correcting in a direction to eliminate the deviation amount of the printing means by the detection output of the deviation amount detection means;
A printing misregistration correction apparatus for color image formation, comprising:   The deviation amount detection unit includes a reading unit that reads the pattern for each color, and a deviation amount calculation unit that calculates a deviation amount of the print deviation amount detection line for each color read by the reading unit with respect to the reference line. The color misregistration printing misalignment correction apparatus according to claim 1, wherein:

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