Electrostatic copying process

Details Electrostatic copying process Electrostatic copying process

1978-11-13

1981-04-28

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Methods

355 14E, 355 16, 430 31, G03B 2732

Patent

active

042642019

ABSTRACT:
In an electrostatic xerographic copying process and apparatus in which a photoconductive insulating master is sensitized by application of a uniform electrostatic charge to the photoresponsive surface thereof, the charge is removed in non-image areas by exposure to a light image corresponding to the non-image areas of an illuminated original to leave charged latent image areas capable of development with coloring material. The sensitized photoreceptive surface is pre-exposed to an electroluminescent element of sufficient intensity to completely or partially remove the charge from all areas or some areas of the surface prior to the exposure to the light image. Complete removal of the charge is advantageous in spaced transverse portions of a continuous master which are not to be exposed to the illuminated original sheet, thereby desensitizing such areas. Partial removal of the charge is advantageous in the case of masters having slow photoresponse, which can be overcome by reducing the surface potential thereof.

REFERENCES:
patent: 3540806 (1970-11-01), Starkweather
patent: 3788737 (1974-01-01), Kidd
patent: 3792913 (1974-02-01), Simmons
patent: 3860338 (1975-01-01), Reehil
patent: 4105321 (1978-08-01), Urso

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