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MAGNETIC IMAGE DEVELOPMENT SYSTEM

IP.com Disclosure Number: IPCOM000023641D
Original Publication Date: 1978-Aug-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 194K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, magnetic toner touchdown development provides a compact and effective means to transport magnetic toner particles for development of an electrostatic latent image. However, in a magnetic imaging process, interaction between the development system magnetic field and the latent magnetic image may cause copy quality degradation. This may be due to partial or total erasure of the magnetic image. In order to eliminate the foregoing problem, magnetic toner may first be deposited electro-statically on an endless dielectric belt electrically biased to a suitable potential. The belt is entrained about a pair of spaced rollers and advanced to a roller having a magnetic latent image recorded thereon. The magnetic latent image attracts the toner particles from the dielectric belt thereto forming a powder image. Process control may be facilitated by regulating the magnitude of the bias and the electrostatic toner force relaxation time.

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XEROX DISCLOSURE JOURNAL

MAGNETIC IMAGE DEVELOPMENT Proposed Classification
SYSTEM U.S. Cl. 118/657
C. Snelling tnt. Cl. G03g 15/09

In an electrophotographic printing machine, magnetic toner
touchdown development provides a compact and effective means
to transport magnetic toner particles for development of an
electrostatic latent image. However, in a magnetic imaging
process, interaction between the development system magnetic
field and the latent magnetic image may cause copy quality
degradation. This may be due to partial or total erasure of
the magnetic image. In order to eliminate the foregoing
problem, magnetic toner may first be deposited electro-
statically on an endless dielectric belt electrically biased
to a suitable potential. The belt is entrained about a pair of
spaced rollers and advanced to a roller having a magnetic
latent image recorded thereon. The magnetic latent image
attracts the toner particles from the dielectric belt thereto
forming a powder image. Process control may be facilitated by
regulating the magnitude of the bias and the electrostatic
toner force relaxation time.

Volume 3 Number 4 July/August 1978 239

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