Color image forming apparatus

Details Color image forming apparatus Color image forming apparatus

2006-08-15

2006-08-15

Ngo, Hoang (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

C399S048000, C399S051000

Reexamination Certificate

active

07092650

ABSTRACT:
There is disclosed in an IOI system which predicts surface potentials of a photosensitive drum positioned in developing positions of individual developing devices from detection results of the surface potentials by two surface potential sensors per developing device, disposed before/after the developing device of each of the plurality of image forming units before/after expose and which controls a charging device in such a manner that a predicted value of the surface potential before the expose indicates a defined developing reference value and which controls an exposing device in such a manner that the predicted value of the surface potential after the expose indicates a defined expose reference value. The image forming units of second and subsequent colors, a charging amount by the charging device is controlled in consideration of charging histories by the charging devices of previous colors.

REFERENCES:
patent: 5243383 (1993-09-01), Parisi
patent: 6647219 (2003-11-01), Buettner
patent: 2769704 (1998-04-01), None

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