Browse Prior Art Database

MEASURING TONER CONCENTRATION

IP.com Disclosure Number: IPCOM000022867D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 350K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the process of developing electrostatographic latent images with colored toner particles and carrier particles, only the toner particles are consumed, Consequently, it is necessary to replenish the developer mix with additional toner particles periodically or continuously to maintain adequate concentration of toner particles in the developer mix, To effectively maintain the developer mix required, efficient techniques for measurement of toner concentration are required.

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XEROX DISCLOSURE JOURNAL

NEASURING TONER CONCENTRATION Proposed Classification
J, Bares U.S. CL 324/109
mt. Cl. GOlr 29/22

In the process of developing electrostatographic latent
images with colored toner particles and carrier particles,
only the toner particles are consumed, Consequently, it is
necessary to replenish the developer mix with additional
toner particles periodically or continuously to maintain
adequate concentration of toner particles in the developer
mix, To effectively maintain the developer mix required,
efficient techniques for measurement of toner concentration
are required.

Toner concentration of an electrostatic developer may be
measured by disposing the developer mix between two electrodes,
agitating the developer to produce electronic noise as a
result of triboelectrification, and measuring and determining
from the generated noise the concentration of the developer.

Electronic noise is generated when a developer comprising
a toner and a carrier particle is agitated between spaced
electrodes, The intensity of this electronic noise decreases
with increased toner concentration and increases with the
specific charge of the toner, Toner which adheres to the
carrier reduces the surface available for triboelectrifica-
tion and consequently the electronic noise,

The noise produced can generally be detected in a wide band
starting from above power line frequency or above the
frenquency of any other disturbing signal or copier vibration,
Specifically, it can be detected in...