Browse Prior Art Database

DOUBLE DEVELOPMENT SYSTEM FOR IMPROVED IMAGE QUALITY

IP.com Disclosure Number: IPCOM000023420D
Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 323K

Publishing Venue

Xerox Disclosure Journal

Abstract

A double development system is proposed to implement the development of electrostatic latent images with toner par-ticles having a bi-modal size distribution, that is a toner comprising particles of two different size ranges.

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XEROX DISCLOSURE JOURNAL

DOUBLE DEVELOPMENT SYSTEM FOR Proposed Classification

IMPROVED IMAGE QUALITY U.S. Cl. 96/1
Narendra S. God mt. Cl. G03g
David W. Meltzer

A double development system is proposed to implement the
development of electrostatic latent images with toner par-
ticles having a bi-modal size distribution, that is a toner
comprising particles of two different size ranges.

The double development system uses two developer mixtures. A
first developer mixture comprises small particles (not neces-
sarily toner) with an appropriate carrier, and a second
developer mixture comprises larger toner particles with an
appropriate carrier, the two carriers being different.

In this double development system, an image is first developed
by the first developer mixture to cover the image with a
monolayer of the small particles and by the second developer
mixture to develop completely the image which was only
partially developed by the first developer mixture. By this
double development system, microfields in the background area
are developed by the fine (small) particles of the first
developer mixture, and these fine particles do not transfer.

The double development system using a first developer mixture
of fine, non-toner particles and a carrier therefor con-
tributes to the elimination of hollow character generation
when the non-toner particles are very hard. When the fine,
non-toner particles are hard, the monolayer of fine, non-toner
particles is not compacted on the photoreceptor wh...