Electrophotographic copying process and apparatus having means f

Details Electrophotographic copying process and apparatus having means f Electrophotographic copying process and apparatus having means f

1982-07-08

1984-10-02

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3R, 355 77, 430 31, G03G 2100

Patent

active

044744552

ABSTRACT:
An electrophotographic copying process and apparatus fast in operation and capable of making reproduced images having substantially the same image density is provided. In accordance with the present invention, pre-exposure is carried out only when a photosensitive member is to be used for image formation after elapsing a predetermined time period during which the photosensitive member has been kept unused. The present invention is fast in operation and minimal in power consumption because the pre-exposure is skipped when unnecessary. However, since pre-exposure is effected when necessary, the image density may be maintained at constant.

REFERENCES:
patent: 4142792 (1979-03-01), Satomi et al.
patent: 4260238 (1981-04-01), Kozuka et al.
patent: 4286865 (1981-09-01), Satomi et al.
patent: 4380386 (1983-04-01), Yasuda et al.

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