Apparatus for forming an image with use of electrophotographic p

Details Apparatus for forming an image with use of electrophotographic p Apparatus for forming an image with use of electrophotographic p

1995-06-01

1998-02-17

Yockey, David F.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

399 46, 358406, B41J 2385, G03G 2100, H04N 129

Patent

active

057196133

ABSTRACT:
In a apparatus for forming a digital image with use of electrophotographic process wherein the gradation is expressed by changing the laser intensity according to image information, at least one of the surface electric potential V.sub.O of photoconductor and the development bias electric voltage V.sub.B is controlled, and the laser intensity is controlled for gradation correction to compensate a change in gradation due to the control of V.sub.O and V.sub.B. A ratio of variable differences of potential in the apparatus, (V.sub.B -V.sub.I)/(V.sub.O -V.sub.I), is kept constant to control the gamma characteristic in the apparatus.

REFERENCES:
patent: 4432634 (1984-02-01), Tabuchi
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patent: 4890125 (1989-12-01), Egawa et al.
patent: 4914459 (1990-04-01), Mama et al.
patent: 4989039 (1991-01-01), Hayashi et al.
patent: 5194878 (1993-03-01), Murakami et al.
patent: 5206686 (1993-04-01), Fukui et al.

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