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DIRECT BINARY METHOD FOR DENSITY MODULATION FOR IONOGRAPHIC PRINTING

IP.com Disclosure Number: IPCOM000026114D
Original Publication Date: 1990-Jun-30
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal

Abstract

In ionographic printing devices, such as that shown, for example, in US-A 4,644,373 to Sheridan, wherein a latent image is formed by imagewise modulation of a stream of ions directed towards a charge retentive surface, the final image density can be controlled by varying the amount of charge deposited in the creation of the latent image. In principle, the use of N data bits to describe each pixel in the image would allow printing 2N distinct grey levels. For example, in a 2 bit per pixel system, each pixel could be one of four levels. It is also known that the size of the modulation or control nib area has a positive effect on the modulation of the ion throughput.