Browse Prior Art Database

TWO-COLOR ELECTROSTATIC PRINTING USING A THERMAL IMAGING PROCESS

IP.com Disclosure Number: IPCOM000027836D
Original Publication Date: 2000-Feb-29
Included in the Prior Art Database: 2004-Apr-09
Document File: 2 page(s) / 61K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an implementation of tri-level pyrography. Advantages include low Unit Manufacturing Cost (UMC) and high stability. The pyrographic image receptor is addressed by a high-resolution thermal print head to produce two different electrostatic potentials separated by a background level.

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XEROX DISCLOSURE JOURNAL

TWO-COLOR ELECTROSTATIC PRINTING Proposed Classification USING A THERMAL IMAGING PROCESS
Christopher Snelling
Robert W. Gundlach

U. S. C1. 3991130 Int. C1. GO3g 15/22

Disclosed is an implementation of tri-level pyrography. Advantages include low Unit Manufacturing Cost (UMC) and high stability. The pyrographic image receptor is addressed by a high-resolution thermal print head to produce two different electrostatic potentials separated by a background level.

REFERENCE

U.S. Patent No. 4,078,929 to Gundlach discloses an electronic printing process known as tri-level xerography. Tri-level Xerography provides two-color printing with inherently perfect registration. Perfect registration results from the single image creation pass that simultaneously generates latent electrostatic images corresponding to both of the desired color image patterns. In the tri-level process, laser exposure of the photoreceptor to two different energies, along with the dark development (no-exposure) potential Vddp, provide the three potentials required to generate two color images. Thus, relative to the photoreceptor potential resulting from a partial discharge exposure, Vddp areas develop as Charge And Develop (CAD) images while totally discharge areas develop as Discharge And Develop (DAD) images.

U.S. Patent No. 5,185,619 to Snelling discloses an electrostatic imaging method and apparatus for providing an alternative and desirable means to achieve two-color print...