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Density Control for Electrophotographic Developer

IP.com Disclosure Number: IPCOM000052680D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Huston, RL: AUTHOR

Abstract

In the figure, xerographic photoconductor drum 10 is subjected to the conventional charging and illumination steps, so as to present a latent electrostatic image to magnetic brush developer 11.

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Density Control for Electrophotographic Developer

In the figure, xerographic photoconductor drum 10 is subjected to the conventional charging and illumination steps, so as to present a latent electrostatic image to magnetic brush developer 11.

Developer 11 is a monocomponent system; i.e., material 12 comprises only magnetic toner. This toner possesses an electrical resistance/ capacitance characteristic which causes the toner to inductively charge to a polarity opposite the photoconductor's latent image, as the toner is transported to developing nip
13.

The magnitude of the toner's inductive charge, and thus the density of the toner which is deposited on the photoconductor's latent image, is controlled by adjustable resistor 14 which connects the magnetic brush roller to ground potential. As a result, toners of widely varying resistance/capacitance characteristics can be used in the copier, and by adjusting resistor 14, consistently uniform copy quality can be obtained with these toners.

An adjustable capacitor 15 may also be used in conjunction with resistor 14.

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