Electrophotography – Control of electrophotography process – Having temperature or humidity detection
Reexamination Certificate
2008-05-13
2008-05-13
Tran, Hoan (Department: 2852)
Electrophotography
Control of electrophotography process
Having temperature or humidity detection
C399S301000
Reexamination Certificate
active
07373093
ABSTRACT:
A color image forming apparatus including a plurality of photosensitive drums on which toner images of different colors are respectively formed. An endless belt confronts the plurality of photosensitive drums. A drive source drives rotation of the endless belt, or alternatively plural drive sources drive the photosensitive drums to individually rotate. A memory stores pre-measured characteristics of a color misregistration of a color image in a sub-scanning direction of the apparatus, the color image formed by transferring images from respective of the plurality of photosensitive drums. Further, a control unit changes an average running speed of the endless belt, or alternatively an average running speed of at least some of the photosensitive drums, by controlling the drive sources, to compensate for color misregistration, based on the stored characteristics of color misregistration. The belt can either transport a paper sheet or have a color image formed thereon as an intermediate transfer device.
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Andoh Toshiyuki
Hosokawa Jun
Kobayashi Kazuhiko
Matsuda Yuji
Miura Yohei
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
Tran Hoan
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