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XEROGRAPHIC IMAGING METHOD

IP.com Disclosure Number: IPCOM000023620D
Original Publication Date: 1978-Jun-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 291K

Publishing Venue

Xerox Disclosure Journal

Abstract

There is described a xerographic imaging method wherein there is utilized a photoreceptor comprising a substrate, a photo-conductive insulating layer, a first electrically insulating layer and a second electrically insulating layer. The second, or outer, electrically insulating layer must be at least an order or magnitude more conductive than the first, or in-terior, electrically insulating layer. Also, the second electrically insulating layer should have a relaxation time constant which is substantially less than the time between charging of the photoreceptor and development of the image whereas the first electrically insulating layer should have a relaxation time constant which is substantially longer than the time between charging and development.

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XEROX DISCLOSURE JOURNAL

XEROGRAPHIC IMAGING METHOD Proposed Classification
John H. Faro U.S. Cl. 96/1.5
mt. Cl. G03g 5/04

There is described a xerographic imaging method wherein there
is utilized a photoreceptor comprising a substrate, a photo-
conductive insulating layer, a first electrically insulating
layer and a second electrically insulating layer. The second,
or outer, electrically insulating layer must be at least an
order or magnitude more conductive than the first, or in-
terior, electrically insulating layer. Also, the second
electrically insulating layer should have a relaxation time
constant which is substantially less than the time between
charging of the photoreceptor and development of the image
whereas the first electrically insulating layer should have a
relaxation time constant which is substantially longer than
the time between charging and development.

In operation, the photoreceptor is uniformly charged with an
appropriate contact charging means such as a biased roller.
To ensure uniform charging of the photoreceptor, the average
distance between the points of contact of the charging means
and the photoreceptor surface (the distance between actual
physical contacts between the charging means and the over-
coating layer) should be less than about three times the
thickness of the overcoating layer. To ensure that this
condition is met, the charging means preferably comprises a
resilient material in order to better conform to the irreg-
ularities in the surface charac...