Electrophotographic printing apparatus using electric potential

Details Electrophotographic printing apparatus using electric potential Electrophotographic printing apparatus using electric potential

1998-12-10

2000-10-10

Grainger, Quana

Electrophotography

Control of electrophotography process

Control of exposure

399 55, G03G 1500

Patent

active

06131000&

ABSTRACT:
An electrophotographic printing apparatus using electric potential dividing development processing without the occurrence of primary fringe and fringe caused by auxiliary exposure has reverse electric fields causing primary fringe and fringe caused by auxiliary exposure adjusted to be nearly equal to each other. The auxiliary exposure is applied to an area surrounding one image, and an electric potential of an intermediate electric potential zone is brought close to a bias electric potential of another image which is not subjected to auxiliary exposure. Further, a white portion to produce a reverse electric potential therein at the rear end of an electric potential portion to be developed with toner, relative to a rotating direction of a developing roller, is exposed with a light intensity forming an electric potential between an electric potential developing an image with toner and the intermediate electric potential, and portions at the front end and the sides are exposed with a light intensity forming the intermediate electric potential.

REFERENCES:
patent: 5817447 (1998-10-01), Yip
patent: 5832333 (1998-11-01), Umeda et al.
patent: 5869214 (1999-02-01), Anzai et al.
patent: 5884119 (1999-03-01), Maruo et al.

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