Belt-drive control device, color-shift detecting method,...

Electrophotography – Image formation – Transfer

Reexamination Certificate

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Details

C399S162000, C399S312000, C399S313000

Reexamination Certificate

active

11334630

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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