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Browse Prior Art Database

IMPROVED SHIELD FOR CORONA GENERATING DEVICE

IP.com Disclosure Number: IPCOM000024124D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 291K

Publishing Venue

Xerox Disclosure Journal

Abstract

The problems addressed by this disclosure are the generation of ozone and noise by corona generators of the type described in U.S. Patents 2,836,725 and 3,983,393 wherein a conductive corona electrode in the form of an elongated wire is

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XEROX DISCLOSURE JOURNAL

IMPROVED SHIELD FOR CORONA Proposed Classification

GENERATING DEVICE U.S. Cl. 250/326 Jean Laing I. Cl. HOlt 19/04

The problems addressed by this disclosure are the generation of ozone and noise by corona generators of the type described in U.S. Patents 2,836,725 and 3,983,393 wherein a conductive corona electrode in the form of an elongated wire is

connected to a corona generating voltage. The wire is partially surrounded by a conductive shield having a cross-section in the shape of a flat-bottom U which is usually electrically grounded. The surface to be charged is spaced from the wire on

the side opposite the shield and is mounted on a grounded substrate. Various biasing means and configurations are also well known in the prior art and an

alternative corona generating device is described in U.S. Patent 2,879,395.

Ozone generation by corona generators is undesirable because of the adverse

effects upon humans exposed to high concentrations for prolonged periods and because of the chemical activity of the gas upon sensitive metal components, rubbers, polymer elements and toner used in copying devices, In U.S. Patent

3,983,393, ozone reduction is accomplished by placing ozone-reducing members intermediate the corona electrode, which is in the form of a thin wire, and the corotron shield. The ozone-reducing members are coated with a catalytic material which reacts with the ozone in an area as close as possible to the area in which it is generated, preferably in the corona glow region.

In accordance with the present disclosure, the corona shie...