Browse Prior Art Database

MULTIPOINT DENSITOMETER DEVELOPABILITY CONTROL

IP.com Disclosure Number: IPCOM000024042D
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 313K

Publishing Venue

Xerox Disclosure Journal

Abstract

The ADC sensors often used in copiers employ a cascade of developer between two NESA glass plates. The amount of light transmitted through toner developed on the two NESA plates is measured and ultimately used to control solid area density levels. These ADC devices are not good analogs of their respective machine development systems since they suffer from noise due to the optical density of developer flowing between the plates and/or do not use a magnetic brush development system. Correlation between sensor output and the machin&s development system may not be close.

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XEROX DISCLOSURE JOURNAL

MULTIPOINT DENSITOMETER DEVELOPABILITY CONTROT

Thomas Camis Paul Spencer

Proposed Classification
U.S. CL 118/7 mt. CL B05c 11/00

The ADC sensors often used in copiers employ a cascade of developer between two NESA glass plates. The amount of light transmitted through toner developed on the two NESA plates is measured and ultimately used to control solid area density levels. These ADC devices are not good analogs of their respective machine development systems since they suffer from noise due to the optical density of developer flowing between the plates and/or do not use a magnetic brush development system. Correlation between sensor output and the machin&s development system may not be close.

Another type reflectance ADC directly measures the developed image on the photoreceptor. However, reflectivity variations due to the photoreceptor surface and the substrate cause measurement noise. This noise prevents measurement of very low toner mass per unit area depositions corresponding to background development.

The control shown in the figure is a miniature toner developing system with a reflection densitometer to measure the optical density of the developed toner. The

LIGHT SOURCE

ELEcTRoMETER

Pf-~OTORECEFTOR

Volume 4 Number 4 July/August 1979 1139

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MULTIPOINT DENSITOMETER DEVELOPABILITY CONTROL (Cont~d)

device consists of a plane chrome surfaced circular mirror on which toner is developed with...