Electrophotographic process and apparatus for making plural copi

Details Electrophotographic process and apparatus for making plural copi Electrophotographic process and apparatus for making plural copi

1982-02-16

1983-10-04

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

To produce multiple image on medium or plural radiant energy...

430 55, 430 57, 430 58, 430 65, 430902, 430 49, 355 3TR, G03G 1322

Patent

active

044079184

ABSTRACT:
A photosensitive member is formed by applying on an electrically conductive substrate, a first photoconductive layer sensitive to a visible light, an insulating charge retentive layer, and a second photoconductive layer sensitive to ultraviolet light, successively in this order. At first the photosensitive member is uniformly charged to a negative polarity, while the photosensitive member is uniformly exposed to the visible light. Then an image of a document to be copied is projected while the photosensitive member is charged to a positive polarity. After that the photosensitive layer is uniformly exposed to the visible light and finally the photosensitive member is uniformly exposed to the ultraviolet light. In this manner, an electrostatic charge image having high contrast and resolution is formed in the photosensitive member by means of charges which are stably trapped across the charge retentive layer. By repeating development and transfer for the same and single charge image once formed in the photosensitive member a number of copies having excellent image quality can be printed.

REFERENCES:
patent: 4335194 (1982-06-01), Sakai

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