Browse Prior Art Database

MAGNETIC SPECTROGRAPH FOR MAGNETIC TONER STUDY

IP.com Disclosure Number: IPCOM000025892D
Original Publication Date: 1988-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 90K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an apparatus for evaluating the magnetic properties of magnetic electrophotographic toners. The apparatus measures the uniformity of the magnetic pigment distribution in single component magnetic brush toners, enabling measurement of variations in the amount of magnetic pigment present in each particle by dispersing the particles according to size and magnetic pigment content.

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(EROX DISCLOSURE JOURNAL

MAGNETIC SPECTROGRAPH FOR MAGNETIC TONER STUDY John G. Ruhland
Bernard Grushkin

 MAGNET ASSEMBLY

Proposed Classification
U.S. C1.364/555 Int. C1. GOln 15/00

TUBE

LL

/s=mOGwH

g1

n

/

 MAGNET ASSE M BLY

FIG. 1

MAGNET

TUBE

MAGNET

Volume 13 Number 5 September/October 1988 281

[This page contains 1 picture or other non-text object]

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MAGNETIC SPECTROGRAPH FOR MAGNETIC TONER STUDY

(Cont'd)

Disclosed is an apparatus for evaluating the magnetic properties of magnetic electrophotographic toners. The apparatus measures the uniformity of the magnetic pigment distribution in single component magnetic brush toners, enabling measurement of variations in the amount of magnetic pigment present in each particle by dispersing the particles according to size and magnetic pigment content.

The apparatus resembles the charge spectrograph apparatus disclosed in U.S. Patent 4,375,673, and com rises a vertical tube, through which a uniform air

approximately 100 degrees with respect to each other, as shown in Figure 1, a partially schematic side view of the apparatus, and Figure 2, a partially schematic top view of the apparatus. Particles to be evaluated are introduced into the center of the moving air column through an inlet tube. As these particles pass a region with a converging magnetic field approximately at a right angle to the direction of air flow, the particles become magnetized and are drawn by dipole forces in the direction of greatest field inc...