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A MAGNETIC BRUSH DEVELOPER ROLL EMPLOYING A SINUSOIDAL MAGNETIC FIELD

IP.com Disclosure Number: IPCOM000022799D
Original Publication Date: 1976-Feb-29
Included in the Prior Art Database: 2004-Mar-26
Document File: 2 page(s) / 242K

Publishing Venue

Xerox Disclosure Journal

Abstract

A magnetic brush developer roll in which the magnet utilized therein generates a sinusoidal field. The developer roll deposits magnetic toner particles on a latent image recorded on a photoconductive member. The sinusoidal field applies a magnetic force on the toner particles which may be made spatially constant preventing density fluxuations in the developed image. Lateral forces, which may reduce image quality by sidewise spreading of the toner during the transfer of the toner from the photoconductive surface to the copy sheet,

This text was extracted from a PDF file.
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XEROX DISCLOSURE JOURNAL

A MAGNETIC BRUSH DEVELOPER ROLL Proposed Classification
EMPLOYING A SINUSOIDAL MAGNETIC U,S~ Cl. 118/637
FIELD mt. Cl. B05b 5/02

G, L. Whittaker

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A magnetic brush developer roll in which the magnet utilized
therein generates a sinusoidal field. The developer roll

deposits magnetic toner particles on a latent image recorded
on a photoconductive member. The sinusoidal field applies a
magnetic force on the toner particles which may be made
spatially constant preventing density fluxuations in the
developed image. Lateral forces, which may reduce image
quality by sidewise spreading of the toner during the transfer
of the toner from the photoconductive surface to the copy sheet,

are not present.

Two alternative embodiments for achieving a periodic field pattern
are illustrated. In the first embodiment, toner particles 10
are attracted to support 12 by magnets 14 spaced therefrom.

As support 12 is spaced from magnets 14 an appropriate distance,
the higher frequency harmonic components on the field diminish
faster than the fundamental frequency. In this manner, the
field pattern approaches a sinusoidal form. As shown in the
second embodiment, the strength of the magnetic field may be
increased if toner particles 10 were brought closer to magnet

14 with magnet 14 being configured as shown.

Volume 1 Number 2 February 1976 39

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40 XEROX DISCLOSURE JOURNAL
volume 1 Nu...