Browse Prior Art Database

CORONA CHARGING ELEMENT

IP.com Disclosure Number: IPCOM000023976D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to corona discharge members used for depositing a charge on an adjacent surface and to a method of making corona discharge electrodes. One type of improved corona charging device is disclosed in United States Patent 4,086,650, wherein the corona discharge member comprises a thin wire coated (at least in the discharge area) with a dielectric material. In a preferred embodiment, this corona discharge member is positioned above a charge collecting surface carried on a conductive substrate held at a reference potential, and it is provided with means for coupling a corona generating voltage intermediate the conductive substrate and the wire of the corona discharge member A conductive shield adjacent the wire and a first biasing means for holding the shield at a potential different from the reference potential is also provided in the preferred embodiment Many of the prior art problems conventionally associated with charging devices have been overcome by the dielectric-coated thin wire of U S Patent 4,086,650 However, improved uniformity in currents and increased life of the dielectric-coated wire are desirable