Electrophotography – Image formation – Transfer
Reexamination Certificate
2007-10-25
2010-12-14
Porta, David P (Department: 2884)
Electrophotography
Image formation
Transfer
C399S303000, C399S308000
Reexamination Certificate
active
07853189
ABSTRACT:
In a belt moving device that is capable of reducing belt speed fluctuation and positional deviation from a target belt position in a sub-scanning direction and performing highly precise position control in a main scanning direction, and an image forming apparatus that uses this belt moving device to prevent color shift in both the main scanning direction and sub-scanning direction of a formed image such that a high-quality image can be formed, belt shift control means reduce shift position variation within a single round trip of an endless belt by feeding back a target value for canceling out the shift position variation within a single round trip of the endless belt and feeding forward a value obtained by multiplying an inverse transfer characteristic of moving means by a transfer characteristic of a target value of the moving means in relation to the control content of the moving means.
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Kamoshita Mikio
Kato Masahiko
Kibune Hideaki
Kudo Koichi
Harness & Dickey & Pierce P.L.C.
Porta David P
Ricoh & Company, Ltd.
Vu Mindy
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