Browse Prior Art Database

SENSITIZATION BY APPLIED VOLTAGE ELECTROPHOTOGRAPHY

IP.com Disclosure Number: IPCOM000024040D
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 385K

Publishing Venue

Xerox Disclosure Journal

Abstract

Except for induction systems using a charge storage layer, xerography has to date required insulating photoconductors capable of supporting charges for relatively long times compared with image exposure times. Initially, photoconductor plates in manually operated equipment had to retain surface charge for at least a full minute. In rotary machine, the photoreceptor had to retain substantially all of its charge for S seconds; and in later machines, the required retention time was down

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XEROX DISCLOSURE JOURNAL

SENSITIZATION BY APPLIED VOLTAGE ELECTROPF-IOTOGRAPHY
Robert W. Gundlach

Proposed Classification
U.S. CL 96/1 R Int. CL G03g

IO8TO o0 OHMS 'SQ.

SnO

Except for induction systems using a charge storage layer, xerography has to date required insulating photoconductors capable of supporting charges for relatively long times compared with image exposure times. Initially, photoconductor plates in manually operated equipment had to retain surface charge for at least a full minute. In rotary machine, the photoreceptor had to retain substantially all of its charge for S seconds; and in later machines, the required retention time was down

to about 1 1/2 seconds.

Two new technologies make possible an entirely new concept in electrophotography in which no latent image exists, The first is virtually instantaneous development and the second is exposure by point-by~pointscanning.

A special photoreceptor is used in which a photoconducting film is sandwiched between two electrodes. The supporting electrode must be a transparent conductor such as ~~ESAg~ss. The free~surfaceelectrode must have a surface resistivity of about 10 to 10 ohms per square.

With the conducting organic overcoating held at ground potential by the conducting rubber roller (and/or margin contacts, etc.), the NESA substrate is maintained at

about 500 to 1000 volts (positive or negative depending on the p/c characteristics). The donor (conducting) is also maintained at about 500 to 1000 volts (positive or

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