Browse Prior Art Database

DUAL PHOTORECEPTOR LIQUID INK DEVELOPMENT

IP.com Disclosure Number: IPCOM000027363D
Original Publication Date: 1996-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 117K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is the use of two counter-rotating synchronous photoreceptors (PAX) followed by a metering roll to develop an image. The photoreceptors are charged and exposed so that, for example, a secondary P/R repels toner whereas a primary PAX attracts toner. Forming a development nip between two such photoreceptors can essentially double the electric fields available for moving the toner onto the image area and away fiom the nonimage areas on the primary P/R. This enables the use of higher Viscosity Carrier fluids and or large development gaps. The enhanced developability offered by this invention would also be useful for very high process speeds.

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XEROX DISCLOSURE JOURNAL

DUAL PHOTORECEPTOR LIQUID INK DEVELOPMENT U. S. C1.355/214 Gary A. Denton
John Knapp
Paul Morehouse

Proposed Classification

Int. C1. G03g 21/00

Proposed is the use of two counter-rotating synchronous photoreceptors (PAX) followed by a metering roll to develop an image. The photoreceptors are charged and exposed so
that, for example, a secondary P/R repels toner whereas a primary PAX attracts toner. Forming a development nip between two such photoreceptors can essentially double the electric fields available for moving the toner onto the image area and away fiom the nonimage areas on the primary P/R. This enables the use of higher Viscosity Carrier fluids and or large development gaps. The enhanced developability offered by this invention would also be useful for very high process speeds.

In liquid development the image is usually formed in a 50-100 micron gap between a P/R and a biased conductive roller. The carrier fluid is chosen to provide the minimum viscosity (maximum toner mobility) and the minimum vapor pressure at room temperature. Carrier fluids with acceptably low vapor pressures unfortunately possess higher viscosities, which reduce the toner mobility. This loss of toner mobility results in reduced latitude for image development and background suppression. The reduced toner mobility may be compensated to some extent by reducing the development gap and/or increasing the toner charge. This approach offers another means of increasing the toner mobility by doubling the strength of the electric fields available for the development process.

This approach may be accomplished by using two photoreceptors to form the development nip. The photoreceptors are charged and exposed in such a manner that the secondary P/R surface voltages mirror of the primary P/R surface voltages. This may be accomplished by two different ways. If both photoreceptors are charged the same polarity, then the secondary photoreceptor would be exposed in an opposit...