Electrophotographic process and apparatus

Details Electrophotographic process and apparatus Electrophotographic process and apparatus

1966-07-08

1978-01-31

Martin, Jr., Roland E.

Gas separation: apparatus

Magnetic separating means

96 1R, 355 3R, G03Q 1322, G03Q 1324

Patent

active

040713610

ABSTRACT:
A process for forming an electrostatic image on a plate having a conductive base, a photoconductive layer exhibiting p-type or n-type semiconductivity and a covering insulative layer, said photosensitive plate being characterized in having carrier charge of a polarity corresponding to the conductivity type of said photoconductive layer injectable from said conductive base into said photoconductive layer and bound in the region of the interface between said insulative and photoconductive layers, wherein the covering insulative layer is initially charged with a polarity opposite to the conductivity type of said photoconductive layer to inject and bind charge carrier in the region of the interface between said insulative photoconductive layers, then the photoconductive layer is exposed to a pattern of image light, while a corona discharge of a polarity opposite to the first charge is applied onto the insulative layer, and then the photoconductive layer is exposed to activating light to discharge bound carrier charge remaining in the region of the interface between said insulating and photoconductive layers and form a high contrast electrostatic image.

REFERENCES:
patent: 3003869 (1961-10-01), Schaffert
patent: 3041166 (1962-06-01), Bardeen
patent: 3196011 (1965-07-01), Gunther et al.
patent: 3234019 (1966-02-01), Hall
patent: 3307034 (1967-02-01), Bean
patent: 3457070 (1969-07-01), Watanabe et al.

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