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A GAS SOURCE FOR IMPROVING IONOGRAPHY OUTPUT

IP.com Disclosure Number: IPCOM000025943D
Original Publication Date: 1989-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the ionographic process, ions are produced in corona chambers into which air is supplied at atmospheric pressure. Ordinarily corona is positive as it utilizes nitrogen, abundant in the air, to produce positive ions. The corona chamber and the orifice for ion output are necessarily small to obtain sufficient resolution of the latent image that will be produced with the ions on a charge retentive surface, and the ion output per pulse is limited.

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XEROX DISCLOSURE JOURNAL

A GAS SOURCE FOR IMPROVING IONOGRAPHY OUTPUT U.S. C1.3461159 Koji Okumura

Proposed Classification

Int. C1. Gold 15/06

In the ionographic process, ions are produced in corona chambers into which air is supplied at atmospheric pressure. Ordinarily corona is positive as it utilizes nitrogen, abundant in the air, to produce positive ions. The corona chamber and the orifice for ion output are necessarily small to obtain sufficient resolution of the latent image that will be produced with the ions on a charge retentive surface, and the ion output per pulse is limited.

Not all nitrogen in the air is utilized by the corona ion source, however. This is partly because of the fact that nitrogen in plasma reacts easily with other species and forms oxides hydrides, etc. Also, because of its relatively high ionization potential, nitrogen ions tend to lose charge before reaching the charge retentive surface by various collision processes.

It is proposed that pure nitrogen gas be introduced into the corona chambers instead of air. In this way, positive ions are produced efficiently as the gas pressure can be controlled for optimum corona discharge. Further, the nitrogen ions will not react with other gases. This not only increases ion generation efficiency, but also prevents the clogging and eroding of the orifice due to nitrogen oxides and hydrides produced in chambers which use air.

A cylinder of compressed nitrogen gas may be used to supply nitrogen g...