Browse Prior Art Database

PHOTOEMISSION ELECTROGRAPHY

IP.com Disclosure Number: IPCOM000022880D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 279K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a method for forming an electrostatic latent image by exploiting the phenomenon of interal photo- emission, In one embodiment of this method, a metal (or other suitable photoemitting surface) is placed in contact with a transparent dielectric layer which in turn is backed by a transparent electrode (such as a piece of NES.~glass) The metal is illuminated through the trans- parent dielectric layer in imagewise configuration simultaneous with application of a voltage between the metal surface and the transparent electrode, ~s a result of coincidence of imagewise illumination and application of an electric field, electron hole pairs are photoexcited in the metal layer at or near the interface of the metal and the dielectric layer resulting in the transfer of one species of photoexcited charge carrier to the dielectric layer. Upon separation of the metal layer and the dielectric, charge remains trapped at the surface of the dielectric and thereby forms a latent electrostatic image. This latent image is capable of development in the presence of light and may be used in the reproduction of more than one copy.

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XEROX DISCLOSURE JOURNAL

PHOTOEMISSION ELECTROGR~PHY Proposed Classification
G, Hartmann U.S. Cl. 96/1
D, Hays mt. CL G03g

Disclosed is a method for forming an electrostatic latent image by exploiting the phenomenon of interal photo-
emission, In one embodiment of this method, a metal (or
other suitable photoemitting surface) is placed in contact
with a transparent dielectric layer which in turn is
backed by a transparent electrode (such as a piece of NES.~glass) The metal is illuminated through the trans-
parent dielectric layer in imagewise configuration
simultaneous with application of a voltage between the
metal surface and the transparent electrode, ~s a result
of coincidence of imagewise illumination and application
of an electric field, electron hole pairs are photoexcited
in the metal layer at or near the interface of the metal
and the dielectric layer resulting in the transfer of one
species of photoexcited charge carrier to the dielectric layer. Upon separation of the metal layer and the
dielectric, charge remains trapped at the surface of the
dielectric and thereby forms a latent electrostatic image.
This latent image is capable of development in the
presence of light and may be used in the reproduction of more than one copy.

alternative embodiments of the above method include modi-
fication of the imaging member so as to provide a charge
carrier transport layer intermediate between the photo-
emitting metal layer and the dielectric layer. The wavelengtri of light used in...