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AN OVERCOATED PHOTOCONDUCTIVE MEMBER FOR LOW DENSITY LINE DEVELOPMENT

IP.com Disclosure Number: IPCOM000024783D
Original Publication Date: 1982-Feb-28
Included in the Prior Art Database: 2004-Apr-03
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, the photoconductive member includes an insulating layer overcoating a photoconductive layer The photoconductive member is charged and imagewise exposed so that low density information is recorded on the photoconductive layer. The photoconductive member is then recharged generating a charge pattern on the surface of the insulating layer corresponding to low density information. The recharging step also resensitizes the photoconductive layer. The photoconductive member is then exposed imagewise such that the low density information is eliminated with only the medium and high density information being recorded. Thereafter, photoconductive member is exposed to an optical screen pattern to create a solid area gradient field. This process may be accomplished in a reproducing machine with scanning optics by simultaneously charging and exposing to record the low density information on the insulating layer during the first portion of the exposure zone followed by exposure alone during the last portion of the exposure zone to record the medium and high density information on the photoconductive layer. The latent image produced by this process generates copies having sharply defined lines and solid areas.

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XEROX DISCLOSURE JOURNAL

AN OVERCOATED PHOTOCONDUCTIVE Proposed Classification MEMBER FOR LOW DENSITY LINE
DEVELOPMENT Int. Cl. G03g 15/00 Lloyd F. Bean

U.S. Cl. 355/3

In an electrophotographic printing machine, the photoconductive member includes an insulating layer overcoating a photoconductive layer The photoconductive member is charged and imagewise exposed so that low density information is recorded on the photoconductive layer. The photoconductive member is then recharged generating a charge pattern on the surface of the insulating layer corresponding to low density information. The recharging step also resensitizes the photoconductive layer. The photoconductive member is then exposed imagewise such that the low density information is eliminated with only the medium and high density information being recorded. Thereafter, photoconductive member is exposed to an optical screen pattern to create a solid area gradient field. This process may be accomplished in a reproducing machine with scanning optics by simultaneously charging and exposing to record the low density information on the insulating layer during the first portion of the exposure zone followed by exposure alone during the last portion of the exposure zone to record the medium and high density information on the photoconductive layer. The latent image produced by this process generates copies having sharply defined lines and solid areas.

Volume 7 Number 1 January/February 1982 29

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