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DOUBLE CHARGING TECHNIQUE TO REDUCE DARK DECAY AND CYCLE DOWN

IP.com Disclosure Number: IPCOM000025790D
Original Publication Date: 1988-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

In conventional xerography, latent image formation on a photoreceptor involves two steps, a first charging step, and a second imagewise exposure step. Between these two steps, the photoreceptor undergoes dark decay, As a result of the dark decay, the dark development potential (VDDP) of the photoreceptor is less than the potential on the photoreceptor immediately after charging. The time constant of the dark decay is determined by processes or characteristics of the photoreceptor.

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XEROX DISCLOSURE JOURNAL

DOUBLE CHARGING TECHNIQUE Proposed Classification TO REDUCE DARK DECAY AND
CYCLE DOWN
Damodar $1. Pai
Edward A. Domm

I

U.S. C1.35314CH Int. C1. G03g 15/00

In conventional xerography, latent image formation on a photoreceptor involves two steps, a first charging step, and a second imagewise exposure step. Between these two steps, the photoreceptor undergoes dark decay, As a result of the dark decay, the dark development potential (VDDP) of the photoreceptor is less than the potential on the photoreceptor immediately after charging. The time constant of the dark decay is determined by processes or characteristics of the photoreceptor.

In accordance with the proposal, after the photoreceptor has been charged. a second charging step, having the same polarity as the first charging step, may be provided just prior to the exposure step. In this scheme. the photoreceptor undergoes dark decay and depletes many carriers causing dark decay prior to the second charging step. Accordingly, the dark decay rate of the photoreceptor following the second charging step is considerably reduced. Cycle down, reduction in VDDP over a number of charging cycles, is also reduced.

A second charging step may be implemented by providing two spaced corotrons operating at the same polarity. The arrangement has the functional appearance of a wide scorotron charging device in a similar position.

Volume 13 Number 1 January/February 1988 29

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