Electrophotography – Image formation – Transfer
Reexamination Certificate
2008-05-20
2008-05-20
Tran, Hoan (Department: 2852)
Electrophotography
Image formation
Transfer
C399S162000, C399S312000, C399S313000
Reexamination Certificate
active
07376375
ABSTRACT:
A mark detecting unit detects a mark that is a reference position of an endless belt. An angular-displacement-error detecting unit detects an angular displacement error of an encoder caused by thickness fluctuation of the endless belt. A first calculating unit calculates a phase and a maximum amplitude to the mark. A second calculating unit calculates correction data according to a distance from the mark on the endless belt. A belt-drive control device controls a belt driving unit by adding the correction data to a preset control target value to stabilize speed fluctuation of the endless belt due to the thickness fluctuation.
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Andoh Toshiyuki
Imai Ryoji
Kobayashi Kazuhiko
Matsuda Hiromichi
Matsuda Yuji
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh Company Limited
Tran Hoan
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