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SURFACE DISCHARGE USING TANDEM SCOROTRONS

IP.com Disclosure Number: IPCOM000025598D
Original Publication Date: 1986-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 99K

Publishing Venue

Xerox Disclosure Journal

Abstract

In many situations insulating solids accumulate electrostatic surface charges on handling, often with undesirable or intolerable consequences For example, residual xerographic toner remaining on the photoreceptor after image transfer to paper is difficult to clean because of charges deposited during stripping of the paper from the photoreceptor Sometimes deleterious surface charges are the result of triboelectrification, such as with photographic film. There, the emulsion layer is sometimes "fogged" by spark discharge of electrostatic surface charges In other cases electrophotographic imaging films acquire charges by handling, and these must be removed before image charges are applied to insure background-free imagmg

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XEROX DISCLOSURE JOURNAL

SURFACE DISCHARGE USING TANDEM SCOROTRONS Robert W. Gundlach

Proposed Classification
U.S. C1 2501326 Int C1 HOIt 19/04

In many situations insulating solids accumulate electrostatic surface charges on handling, often with undesirable or intolerable consequences For example, residual xerographic toner remaining on the photoreceptor after image transfer to paper is difficult to clean because of charges deposited during stripping of the paper from the photoreceptor Sometimes deleterious surface charges are the result of triboelectrification, such as with photographic film. There, the emulsion layer is sometimes "fogged" by spark discharge of electrostatic surface charges In other cases electrophotographic imaging films acquire charges by handling, and these must be removed before image charges are applied to insure background-free imagmg

A commonly used technique for removing such unwanted charges involves the use of a c corona This is complicated somewhat by the need to bias the a c source or shield a few hundred volts positive because of an inherent excess of negative charging from an a c. corotron at zero bias Furthermore, the method tends to be rather slow unless very high levels of a c curonn are generated a rid this produces excess ozone and radio noise as well as requiring more costly power supplies

The development of the scorotron of the potential-well type with very precise control of the final surface potential makes possible the use of simple d c charging...