Image forming device with residual charge removal control

Details Image forming device with residual charge removal control Image forming device with residual charge removal control

1995-12-21

1998-08-11

Pendegrass, Joan H.

Electrophotography

Supplemental electrophotographic process

Exposure or charging

399 50, 399128, 430 31, G03G 1500

Patent

active

057940975

ABSTRACT:
The present invention relates to image forming device such as copying machines and laser printers, which use an electrophotographic (xerognaphic) process. A simple control method without using any additional complex means can equalize a surface potentional of a light-sensitive drum to keep a light-quality of an image formed even for the first rotation of the light-sensitive drum. A charge-removal prohibiting means, a charge-potentional changing means and a developing bias-potentional changing means are controlled in accordance with an extent of a change of a surface potential of a light-sensitive body, which depends upon a light fatigue and an ambient temperature of the light-sensitive body and/or a pause after a preceding image process.

REFERENCES:
patent: 4380386 (1983-04-01), Yasuda et al.
patent: 4474455 (1984-10-01), Hirakura et al.
patent: 4797707 (1989-01-01), Iwahashi et al.
patent: 4933721 (1990-06-01), Yasuda et al.
patent: 4935777 (1990-06-01), Noguchi et al.
patent: 5057867 (1991-10-01), Ishigaki et al.

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