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PRINT COROTRON INDUCTOR IN AN ION PROJECTION PRINTING DEVICE

IP.com Disclosure Number: IPCOM000026233D
Original Publication Date: 1990-Dec-31
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal

Abstract

In an ion projection printing device such as that disclosed in U.S. Patent No. 4,463,363 to Gundlach et al., a corona generating wire spans the entire length of the printing head in close proximity to the walls of the printhead body. Any perturbations in the corona wire, or passing air may result in the generation of an electric arc between the positively charged wire and the surrounding walls of the printhead. Concurrently, the arc causes a large current surge through an external corona supply wire which, in turn, generates an electromagnetic field of sufficient strength to disrupt the logic circuitry used to control the ion modulation electrodes of the device. Generally, this disruption will cause defects in the latent ionographic image that become visible upon development of the image. It is, therefore, desirable to reduce the effects of electromagnetic interference caused by corona arcing in an ion projection printing device.