Image forming apparatus and method for controlling exposure cond

Details Image forming apparatus and method for controlling exposure cond Image forming apparatus and method for controlling exposure cond

1997-11-26

1999-03-23

Braun, Fred L.

Electrophotography

Control of electrophotography process

Control of exposure

399 26, G03G 1504

Patent

active

058872221

ABSTRACT:
An image forming apparatus having a photosensitive unit including a film disposed thereon. The film wears over time causing its thickness to decrease, which causes non-uniformity in line image data produced by the apparatus. The invention counteracts changes in the film thickness by adjusting the intensity of the edges of the image in response to the amount of wear the apparatus has undergone. The amount of wear can be gauged by detecting the number of rotations made by the photosensitive unit or the number of sheets processed by the photosensitive unit. The invention has the particular advantage of ensuring consistency in the thickness of line images. A method for controlling exposure is also described.

REFERENCES:
patent: 4136945 (1979-01-01), Stephens
patent: 5017963 (1991-05-01), Tuhro
patent: 5160967 (1992-11-01), Tonegawa
patent: 5278612 (1994-01-01), Inui
patent: 5394221 (1995-02-01), Kishimoto et al.
patent: 5726759 (1998-03-01), Watanabe et al.

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