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APPLICATION OF FLOATING BIAS DEVELOPMENT TO COUNTERACT RADIANT FUSER INTERACTIONS WITH SELENIUM TELLURIUM PHOTORECEPTORS

IP.com Disclosure Number: IPCOM000025692D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 186K

Publishing Venue

Xerox Disclosure Journal

Abstract

Seleniumrtellurium photoreceptors have been shown to provide greatly improved blue copyability and suppress goldenrod background effects over selenium photoreceptors. However, for some systems, the increased spectral response of the selenium-tellurium photoreceptors gives rise to interactions with incident light emitted from machines utilizing radiant fusers. For example, one xerographic design employing a radiant fuser with a tungsten quartz lamp requires fuser warm-up times of several minutes. The tungsten quartz lamp is illuminated for several minutes and exposes a segment of the photoreceptor located in the toner image transfer station. Interaction of this exposure with a selenium-tellurium photoreceptor causes enhanced charge trapping in the exposed areas which in turn cause correspondingly high background on copies. Similarly, long copy runs can lead to an overall increase in background voltage. The situation is aggravated in some devices by the close proximity of the fuser to the photoreceptor. One solution has been to place an optical filter over the fuser lamp but this involves substantial cost and, to a slight extent, adversely affects fusing. Thus, where photoreceptor voltage variations occur due to the presence of incident light from a radiant

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XEROX DISCLOSURE JOURNAL

APPLICATION OF FLOATING BIAS DEVELOPMENTTO COUNTERACT U.S. C1.430/103 RADIANT FUSER INTERACTIONS

RECEPTORS

Edward C. Savage James M. Markovics Geoffrey M. T. Foley

Proposed Classification

Int. C1. G03g 13/06

WITH SELENIUM TELLURIUM PHOTO-

Seleniumrtellurium photoreceptors have been shown to provide greatly improved blue copyability and suppress goldenrod background effects over selenium photoreceptors. However, for some systems, the increased spectral response of the selenium-tellurium photoreceptors gives rise to interactions with incident light emitted from machines utilizing radiant fusers. For example, one xerographic design employing a radiant fuser with a tungsten quartz lamp requires fuser warm-up times of several minutes. The tungsten quartz lamp is illuminated for several minutes and exposes a segment of the photoreceptor located in the toner image transfer station. Interaction of this exposure with a selenium- tellurium photoreceptor causes enhanced charge trapping in the exposed areas which in turn cause correspondingly high background on copies. Similarly, long copy runs can lead to an overall increase in background voltage. The situation is aggravated in some devices by the close proximity of the fuser to the photoreceptor. One solution has been to place an optical filter over the fuser lamp but this involves substantial cost and, to a slight extent, adversely affects fusing. Thus, where photoreceptor voltage variations occur due to the presence of incident light from a radiant

Volume 12 Number 2 March/April 1987 105

[This page contains 1 picture or other non-text object]

Page 2 of 4

APPLICATION OF FLOATING BIAS DEVELOPMENT TO COUNTERACT RADIANT FUSER INTERACTIONS WITH SELENIUM TELLURIUM PHOTORECEPTORS (Cont'd)

fuser or other tungsten lamp source, a new approach is desirable to enable the use of selenium-tellurium or other red-sensitive photoreceptors. It has been found that the use of floating bias eliminates the need for a fuser filter by enhancing system latitude in a simple, cost effective manner. The only prerequisites for this system are an alloy photoreceptor and conductive magnetic brush development.

As illustrated in the attached diagram, two Zener diodes 10 and 12, a resistor (not shown), or any suitable combination thereof in series with a developer ap licator roll source voltage 14 allows the bias on developer applicator roll 16 to f; oat within a specified range. The floating range would be large enough to encompass expected photoreceptor voltage variations. In turn, these voltage variations would no longer be perceptible in copy quality since the floating bias tends to maintain the same. incremental cleaning field above the background voltage. More specifically, two identical 30 volt 1/4 watt glass encased Zener diodes 10 and 12 arranged back to back were positioned in a circuit between a source voltage 14 and a developer applicator roll 16. The values of the Zener diodes allow t...