Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-08-02

2008-10-07

Pham, Hai C (Department: 2861)

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Light or beam marking apparatus or processes

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C347S250000

Reexamination Certificate

active

07432943

ABSTRACT:
An image forming apparatus which has a plurality of image forming stations arranged in parallel, each of the image forming stations having a photosensitive drum, and which forms a desired image by combining toner images formed on the photosensitive drums. A laser scanning optical system deflects and scans a plurality of laser beams concurrently with a single polygon mirror to irradiate the photosensitive drums. In a monochromatic mode, the rotation speed of the photosensitive drum for forming a black image is changed higher, and synchronization of writing in a main scanning direction is performed by using one of the laser beams irradiating the other photosensitive drums of which rotation speeds are not changed.

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Office Action issued in the corresponding Chinese Patent Application No. 200610128851.X, dated May 16, 2008, and translation thereof.

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