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FIELD ENHANCEMENT OF PRETRANSFER DISCHARGE

IP.com Disclosure Number: IPCOM000022947D
Original Publication Date: 1976-May-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 226K

Publishing Venue

Xerox Disclosure Journal

Abstract

Pre~transfer exposure of a toner developed photoreceptor 1 to a high intensity pre~transfer lamp 2 allows much of the image charge 3 to leak through the photoreceptor 1 to the grounded photoreceptor substrate 4. However, some image charge is trapped in place by the charge on the developed toner 5. A field imposed across the photoreceptor during this pre~transferexposure would cause some or all of this trapped charge to also conduct through the illuminated photoreceptor to ground. Reducing the image charge before transfer would reduce the force holding the toner to the photoreceptor, thereby improving transfer. It is proposed that a transparent conductive electrode 6 be used between the pre-transfer lamp 2 and the photoreceptor just up- stream of the transfer field generator 7, with the lamp 2 shielded to confine its light output through only part of the electrode 6. The electrode 6 would be biased to impose a field across the photoreceptor 1 which would drive the image charge toward the grounded substrate 4, This field would be applied beyond the area of the photoreceptor which is illuminated by the lamp 2 so the charges would be trapped adjacent the substrate 4 surface prior to the transfer of the toner to the copy sheet 8,

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XEROX DISCLOSURE JOURNAL

FIELD ENHANCEMENT OF Proposed Classification
PRETRANSFER DISCHARGE U.S. Cl. 96/L4
R. F. Koehier mt. Cl. G03g 13/14
E. W, Connors

3

Pre~transfer exposure of a toner developed photoreceptor 1
to a high intensity pre~transfer lamp 2 allows much of the
image charge 3 to leak through the photoreceptor 1 to the
grounded photoreceptor substrate 4. However, some image
charge is trapped in place by the charge on the developed
toner 5. A field imposed across the photoreceptor during
this pre~transferexposure would cause some or all of this
trapped charge to also conduct through the illuminated
photoreceptor to ground. Reducing the image charge before
transfer would reduce the force holding the toner to the
photoreceptor, thereby improving transfer. It is proposed
that a transparent conductive electrode 6 be used between
the pre-transfer lamp 2 and the photoreceptor just up-
stream of the transfer field generator 7, with the lamp 2
shielded to confine its light output through only part of
the electrode 6. The electrode 6 would be biased to impose
a field across the photoreceptor 1 which would drive the
image charge toward the grounded substrate 4, This field
would be applied beyond the area of the photoreceptor which
is illuminated by the lamp 2 so the charges would be
trapped adjacent the substrate 4 surface prior to the
transfer of the toner to the copy sheet 8,

5

Volume 1 Number 5 May 1976 13

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