Electrophotographic apparatus

Details Electrophotographic apparatus Electrophotographic apparatus

1992-11-13

1995-03-21

Fuller, Benjamin R.

Photocopying

Contact printing

Light boxes

355246, 355326R, 358504, G03G 2100

Patent

active

054001200

ABSTRACT:
Qualitative relations between changes in a charge voltage, a developer bias voltage and an exposure light intensity control voltage and change in an image density are investigated in advance, and a density error is derived by a difference between the density of the image of a reference mark and a target density. Respective variations of the charge voltage, developer bias voltage and exposure light intensity control voltage are derived on the basis of the qualitative relations and the density error, and thereby the charge voltage, developer bias voltage and exposure light intensity voltage are changed so as to decrease the density error.

REFERENCES:
patent: 4780744 (1988-10-01), Porter et al.
patent: 4847659 (1989-07-01), Resch, III
patent: 4894685 (1990-01-01), Shoji
patent: 4974024 (1990-11-01), Bares et al.
patent: 5148289 (1992-09-01), Nishiyama et al.
patent: 5206686 (1993-04-01), Fukui et al.

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