Electrophotographic process

Details Electrophotographic process Electrophotographic process

1977-11-28

1980-04-08

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

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

Charging simultaneous with imaging

355 3CH, G03G 1304, G03G 13056

Patent

active

041971191

ABSTRACT:
In an electrophotographic process for the formation of an electrostatic latent image on a photosensitive element for electrophotography produced through the sequential lamination on an electrically conductive substrate of an electrically insulating layer, a photoconductive layer, and an electrically insulating surface layer by repeating a series of steps comprising a first charging; a light exposure of the entire surface; a second charging of a polarity opposite to that of the first charging; and an image-wise exposure to light, wherein the polarity between the first electrical charging and the second electrical charging is changed from positive to negative and vice versa simultaneously (either a positive image or a negative image can be obtained from an original using the same developer).

REFERENCES:
patent: 3676117 (1972-07-01), Kinoshita
patent: 3677751 (1972-07-01), Ohta

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