Articles

Video/optical requirements for a highlight color laser scanner

[+] Author Affiliations
Ronald E. Jodoin

Rochester Institute of Technology, Physics Department, Rochester, New York?14623

Robert P. Loce, Michael Cianciosi, Martin Banton

Xerox Corporation, Corporate Research and Technology, Webster, New York?14580 ?

J. Electron. Imaging. 7(4), 816-824 (Oct 01, 1998). doi:10.1117/1.482667
History: Received Oct. 6, 1997; Revised March 4, 1998; Accepted June 24, 1998
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Abstract

The desire to print high quality, highlight color documents at production rates has generated the need for a single-pass highlight color laser scanner. We examine a pulsed-imaging, pulse-width-modulated polygon laser scanner that enables multilevel exposure and subsequent development of black and highlight color toner. As currently used in the Xerox 4850 and 4890 digital printers, this laser scanner writes three different exposure levels; zero-level exposure, mid-level exposure and high exposure for black, white, and highlight color, respectively. In this paper we review the functioning of a pulsed-imaging laser scanner and then examine how it is used in a pulse-width-modulated trilevel mode. A first-order linear-systems model is used to examine the specialized video required for achieving uniform line appearance for both black and highlight color. This model further describes how resolution enhancement may be enabled. A complete laser/xerographic model is used to generate simulated output. The electronics that provide the pulse width and position modulated video signals are described, and photomicrographs of sample prints from the Xerox 4850 are shown. © 1998 SPIE and IS&T.

© 1998 SPIE and IS&T

Citation

Ronald E. Jodoin ; Robert P. Loce ; Michael Cianciosi and Martin Banton
"Video/optical requirements for a highlight color laser scanner", J. Electron. Imaging. 7(4), 816-824 (Oct 01, 1998). ; http://dx.doi.org/10.1117/1.482667


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