Electrophotographing apparatus

Details Electrophotographing apparatus Electrophotographing apparatus

1993-09-24

1994-09-20

Moses, R. L.

Photocopying

Contact printing

Light boxes

355228, G03G 1500

Patent

active

053494210

ABSTRACT:
An electrophotographing apparatus includes a photosensor for sensing or detecting a reflectance of an original, and an output voltage of the photosensor is sent to a microcomputer. In response to the output voltage of the photosensor, the microcomputer controls a bias voltage which is applied to an electric conductive substrate of a photoreceptor from a bias voltage source. The bias voltage is adjusted such that a change of an exposed voltage according to the reflectance of the original can be canceled, and resultingly, the exposed voltage is kept constant. On the other hand, a developer is connected to the ground, and therefore, a voltage difference between the exposed voltage and a developing voltage becomes constant.

REFERENCES:
patent: 4378153 (1983-03-01), Nishimura et al.

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