Color registration method and image forming apparatus
A color image and image technology, applied in the field of color image forming equipment, can solve the problems that the direction of alignment and centrifugal cannot be adopted, and the color misregistration is not obvious, etc.
Inactive Publication Date: 2010-01-13
SHARP KK
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Problems solved by technology
Since the rotation period of the black photoreceptor is different from that of other photoreceptors, the technique of aligning the centrifugal direction so that the color misregistration is not conspicuous cannot be used
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[0042] In the present invention described above, the state where the phases of the speed changes of each photoreceptor match each other means, for example, the state when the maximum point and the minimum point of the peripheral speed change of each photoreceptor at the exposure position match each other, respectively. described later Figure 16 An example of each of the YMC photosensitive drums in this state is shown.
[0043] In other words, the present invention performs the following operations for the first problem:
[0044] (1) A first toner pattern is formed on a transfer belt, and the position of the formed toner pattern is measured to calculate a misregistration amount (deviation) 1 from a desired position.
[0045] (2) Then, the second toner pattern is formed at a position at a predetermined interval from the first toner pattern in the conveying direction of the transfer belt. The position where the second toner pattern is formed is measured to calculate the misreg...
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The present invention provides a color registration method in a color image forming apparatus including a plurality of drum-type photoconductors for driving some or all of the photoconductors having the same diameter to match pitch fluctuations which correspond to a rotational cycle of the photoconductors, the method including: a first measurement step for forming a first registration image for each color and measuring formation positions of a plurality of predetermined portions in each registration image; a second measurement step for forming a second registration image for each color and measuring formation positions of a plurality of predetermined portions in each registration image; a calculation step for calculating a periodic fluctuation component being contained in the images in different colors and corresponding to the rotational cycle of the photoconductors so as to obtain phases thereof; and a step for adjusting a rotational phase of the photoconductors in order for the obtained phases matching to each other, wherein the interval between first and second registration images in the rotating direction is set such that disturbance components in which a cycle is assumed beforehand, cancel with each other by calculating the deviation.
Description
technical field [0001] The present invention relates to a color registration method and a color image forming device. Background technique [0002] There is known a color image forming apparatus (so-called tandem type color image forming apparatus) having a plurality of drum photoreceptors. In a color image forming apparatus, it is very important to reduce the positional deviation (color misregistration) of each color to such an extent that it is not noticeable. When the color misregistration is large, it may be evaluated as poor image quality. The largest contributor to color misregistration is the periodic coarseness on the output image caused by the eccentricity of each photoreceptor. The ideal countermeasure is to sufficiently reduce the amount of centrifugation per photoreceptor, but at the same time, the trade-off between cost and mass production should be considered. [0003] In view of this, various methods for making color misregistration inconspicuous even if th...
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IPC IPC(8): G03G15/01
Inventor 松山贤五原田吉和富田教夫菊池吉晃藤田浩一
Owner SHARP KK