Electrophotographic image forming apparatus

Details Electrophotographic image forming apparatus Electrophotographic image forming apparatus

1994-12-13

1996-12-03

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

355204, 355208, G03G 2100

Patent

active

055812210

ABSTRACT:
A copying machine wherein a developing device is provided with a first sensor for detecting the toner density in a developer and a second sensor which is provided around a photosensitive drum for detecting the amount of deposited toner on a test pattern. The toner supply is controlled according to a result detected by the second sensor. When the toner density is judged high from a result detected by the first sensor, a developing bias voltage is set high by a computer, and when the toner density is judged low, the developing bias voltage is set low.

REFERENCES:
patent: 4468112 (1984-08-01), Suzuki et al.
patent: 4980726 (1990-12-01), Aoki
patent: 5083160 (1992-01-01), Suzuki et al.
patent: 5357317 (1994-10-01), Fukuchi et al.
patent: 5436705 (1995-07-01), Raj

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