Browse Prior Art Database

AUTOMATIC DEVELOPABILITY CONTROL

IP.com Disclosure Number: IPCOM000024171D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 49K

Publishing Venue

Xerox Disclosure Journal

Abstract

In electrophotographic printing machines, an electrometer may be employed to measure the potential on the photoconductive member. The output from the electrometer is then set to a pulsed power supply which biases a magnetic brush developer roller to a potential such that the toner particles are attracted to the photoconductive member. The pulse duration is determined by the size of the test image and the photoconductive member's speed. In this manner, a test patch is developed on the photoconductive member. The test patch may have light rays directed thereto. The light reflected from the test patch is detected by a photosensor and provides an indication of the density of the toner particles adhering to the photoconductive member. This, in turn, provides a measurement of the concentration of toner particles within the developer mixture. The signal may be employed to actuate a toner dispenser for furnishing additional toner particles to the developer mixture so as to maintain the concentration at a desired level.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

KEROX DISCLOSURE JOURNAL

AUTOMATIC DEVELOPABILITY CONTROL Proposed Classification
A. Liebman U.S. C1. 118/646 Int. C1. G03g 15/08

In electrophotographic printing machines, an electrometer may be employed to measure the potential on the photoconductive member. The output from the electrometer is then set to a pulsed power supply which biases a magnetic brush developer roller to a potential such that the toner particles are attracted to the photoconductive member. The pulse duration is determined by the size of the test image and the photoconductive member's speed. In this manner, a test patch is developed on the photoconductive member. The test patch may have light rays directed thereto. The light reflected from the test patch is detected by a photosensor and provides an indication of the density of the toner particles adhering to the photoconductive member. This, in turn, provides a measurement of the concentration of toner particles within the developer mixture. The signal may be employed to actuate a toner dispenser for furnishing additional toner particles to the developer mixture so as to maintain the concentration at a desired level.

Volume 4 Number 6 November/December 1979 713

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

Page 2 of 2

November/December 6 Number 4 Volume XEROX 714 DISCLOSURE JOURNAL 1979

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