发明名称 |
COLOR IMAGE FORMING APPARATUS, TANDEM DRUM TYPE COLOR IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE USED FOR THE COLOR IMAGE FORMING APPARATUS |
摘要 |
<P>PROBLEM TO BE SOLVED: To provide a color image forming apparatus capable of obtaining high quality image at high printing speed and to provide a process cartridge used for the color image forming apparatus. <P>SOLUTION: A reflection type photo-sensor 41 detects a mark pattern formed on a transfer belt 33 by a mark pattern formation part 11. Based upon the detection by the sensor 41, a distance difference measurement part 12 measures a distance difference that is a distance by which the mark pattern is displaced from a reference value. A speed detection part 13 detects a moving velocity v1 of the transfer belt 33 during a period from the formation of the mark pattern to the completion of the detection and a moving velocity v2 of it during normal image formation. A speed difference calculation part 14 calculates Δv=v1-v2. In accordance with the distance difference and Δv, a control part 15 controls the timing of image formation so as to reduce color shift. <P>COPYRIGHT: (C)2004,JPO |
申请公布号 |
JP2004139036(A) |
申请公布日期 |
2004.05.13 |
申请号 |
JP20030305293 |
申请日期 |
2003.08.28 |
申请人 |
RICOH CO LTD |
发明人 |
KOBAYASHI KAZUHIKO;YAMANAKA TETSUO;TSUKASAKI HIROYASU |
分类号 |
G03G15/01;B41J2/385;G01D15/06;G03G15/16;G03G21/00;G03G21/18 |
主分类号 |
G03G15/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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