Image forming apparatus

Details Image forming apparatus Image forming apparatus

2005-03-22

2005-03-22

Tran, Huan (Department: 2861)

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Light or beam marking apparatus or processes

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C347S235000

Reexamination Certificate

active

06870559

ABSTRACT:
It is an object of the present invention to provide an image forming apparatus that is capable controlling the rotational speed of a polygon motor so as to reduce variations in the rotational speed of the polygon motor to the minimum possible level and enable steady rotation of the polygon motor with ease in controlling the rotational speed of the polygon motor to a target speed. When a photosensitive drum is exposure-scanned while the traveling direction of an exposure laser beam is deflected by the polygon mirror, a polygon motor for driving the polygon mirror is controlled according to target periods or target speeds of the polygon motor, which are determined for respective mirror planes of the polygon mirror.

REFERENCES:
patent: 5541637 (1996-07-01), Ohashi et al.
patent: 5754215 (1998-05-01), Kataoka et al.
patent: 5943087 (1999-08-01), Kataoka et al.

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