Color image forming apparatus, tandem type color image...

Details Color image forming apparatus, tandem type color image... Color image forming apparatus, tandem type color image...

2005-08-23

2005-08-23

Brase, Sandra L. (Department: 2852)

Electrophotography

Image formation

Transfer

C347S116000

Reexamination Certificate

active

06934498

ABSTRACT:
A mark pattern forming unit forms a mark pattern on a transfer belt, and a reflection type optical sensor detects the mark pattern. An interval difference acquiring unit acquires an interval difference that is a deviation of each mark from a reference position. A speed detector detects a moving speed v1of the transfer belt in a period between formation of the mark pattern and the detection of the mark pattern, and a moving speed v2during image formation. A speed difference calculating unit calculates a speed difference Δv=v1−v2, and a control unit controls a timing of forming an image based on the interval difference and the value of Δv so as to reduce position misalignment.

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