Electrophotographic method and apparatus for providing accurate

Details Electrophotographic method and apparatus for providing accurate Electrophotographic method and apparatus for providing accurate

1982-08-20

1985-01-22

Grimley, A. T.

Photocopying

Including fiber optics

355 3CH, 430 54, 430 55, G03G 1522

Patent

active

044948565

ABSTRACT:
An electrophotographic method and apparatus is disclosed which is able to faithfully reproduce the half-tone portion of an original image on a photosensitive medium having an electroconductive layer, a photoconductive layer and an insulating surface layer. The present invention is directed particularly to improvements in the secondary charging step in the above method. According to the invention, the process of secondary charge includes the steps of subjecting the photosensitive medium to the action of corona discharge having the component of opposite polarity to that of the primary charge with simultaneous light image exposure, exposing the photosensitive medium surface to a light image while reducing or stopping the action of corona discharge and exposing the photosensitive medium surface to a light image while controlling the amount of corona discharge.

REFERENCES:
patent: 3666363 (1972-05-01), Tanaka et al.
patent: 3797927 (1974-03-01), Takahashi et al.
patent: 4311778 (1982-01-01), Kadowaki et al.

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