Image forming apparatus

Details Image forming apparatus Image forming apparatus

2003-09-02

2008-08-26

Poon, King (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Communication

C358S001100, C382S276000, C382S281000, C382S312000, C382S314000

Reexamination Certificate

active

07417757

ABSTRACT:
An image forming apparatus, which includes a plurality of image forming portions transferring a yellow image, a magenta image, a cyan image, and a black image formed on a plurality of photoconductor drums to a sheet conveyed on a conveying belt, a marking unit forming marks on the conveying belt, a detecting unit detecting the marks with three or more sensors aligned in a direction normal to a direction in which the sheet is conveyed, a calculating unit calculating an amount of color misalignment in accordance with results detected by the detecting unit, and a correcting unit correcting the color misalignment in accordance with the calculated amount of color misalignment, wherein the calculating unit calculates an amount of skew difference in accordance with results detected by two sensors among the three or more sensors, wherein one sensor of the two sensors is disposed on one end of the three or more sensors and the other sensor of the two sensors is disposed on the other end of the three or more sensors, wherein the correcting unit corrects the skew difference in accordance with the calculated amount of skew difference.

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