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Browse Prior Art Database

IMAGE DATA STORAGE FOR ASYNCHRONOUS ION PROJECTION PRINTER

IP.com Disclosure Number: IPCOM000025405D
Original Publication Date: 1985-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 77K

Publishing Venue

Xerox Disclosure Journal

Abstract

When printing by means of ions deposited upon plain paper in image configuration, care must be taken to develop and fuse the image before the charges decay. In an asynchronous machine i.e., one which does not receive data at a uniform and constant rate, the paper motion will be interrupted while waiting for data.

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XEROX DISCLOSURE JOURNAL

IMAGE DATA STORAGE FOR ASYN- CHRONOUS ION PROJECTION PRINTER U.S. CI. 346/149 Brian John Dahlquist

Proposed Classification

Int. CI. Gold 9/00

When printing by means of ions deposited upon plain paper in image configuration, care must be taken to develop and fuse the image before the charges decay. In an asynchronous machine i.e., one which does not receive data at a uniform and constant rate, the paper motion will be interrupted while waiting for data.

Plain paper will not normally retain charge long enough to store a charged and undeveloped image while the data to the printer has been interrupted. For example, the charge decay rate is dependent upon the moisture content of the paper and can be expected to vary from about 1 second to about 5 minutes. Untreated, ordinary, natural paper having an expected moisture content of about
5.5% would hold a charge for about 10 to 20 milliseconds whereas heating it to reduce the moisture content to about 2.5% would enable it to hold a charge for about 10 seconds, and reducing the moisture content to about 1.7% would enable it to hold a charge for about 4 to 5 minutes. In most cases the moisture content will be reduced to about 2.5%.

During the sequential printing process, the following steps take place: (1) the paper is heated; (2) the paper is moved in contact with a conductive back electrode; (3) an imagewise charge is placed on the paper by the ion projection head; (4) the paper is moved along the conductive surface to a developing station where the image is made visible...