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A DEVELOPMENT SENSOR

IP.com Disclosure Number: IPCOM000022848D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 332K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the process of developing electrostatographic latent images with 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 high quality development, efficient techniques for measuring development are required.

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XEROX DISCLOSURE JOURNAL

A DEVELOPMENT SENSOR Proposed Classification
L, B, Schein U.S. Cl. 118/9
mt. Cl, B05c 11/00

In the process of developing electrostatographic latent
images with 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 high quality development, efficient
techniques for measuring development are required.

Development may be measured by using a shielded wire which
is capacitively coupled to the photoconductor. The voltage
induced across the shielded wire is a direct measurement of
the developed image charge~ This voltage can be measured
or used in signaling toner replenishment when the volta~e
rises above a predetermined level,

Developed toner present on an electrostatic latent image
decreases the potential above the photoconductor because
the toner is a charged material resting on the dielectric
photoconductive surface bearing the image. The effect of
the toner is to reduce the photoconductor potential, When
toner concentration is diminished through non-replenishment
from the toner housing, the amount of toner available to
develop or cover the electrostatic latent image is reduced..
With less toner available to develop the electrostatic latent
image, the potential above such developed images rises which
when capacitively coupl...