Belt moving device and image forming apparatus using same

Electrophotography – Image formation – Transfer

Reexamination Certificate

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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.

REFERENCES:
patent: 6925279 (2005-08-01), Kamoshita et al.
patent: 2003/0223786 (2003-12-01), Kamoshita et al.
patent: 2007/0086813 (2007-04-01), Takeyama
patent: 06-263281 (1994-09-01), None
patent: 2002-251080 (2002-09-01), None
patent: 03399492 (2003-02-01), None
patent: 2003-241535 (2003-08-01), None
patent: 2005-091943 (2005-04-01), None
patent: 2005-148127 (2005-06-01), None

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