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Proceedings Paper

Polygon Signature And Motor Hunt Correction
Author(s): Douglas N. Curry
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Paper Abstract

Scan velocity variation in a flying spot laser scanner is a major contributor to pixel placement errors. Two sources of scan velocity variation are Motor Hunt and Polygon Signature. Since the incremental change in frequency needed to correct scan velocity variation may be very small, a highly accurate method is required to both measure the facet-dependent velocity differences and correct them.' An all-digital system which has the required high accuracy has been successfully demonstrated for the correction of these effects. The system employs a crystal time base and adjusts the frequency of a bit clock by fractional control of its phase. The accuracy of the measurements of the polygon characteristics is augmented by averaging many measurements.

Paper Details

Date Published: 27 November 1984
PDF: 4 pages
Proc. SPIE 0498, Laser Scanning and Recording, (27 November 1984); doi: 10.1117/12.944519
Show Author Affiliations
Douglas N. Curry, Xerox Corporation- Palo Alto Research Center (United States)

Published in SPIE Proceedings Vol. 0498:
Laser Scanning and Recording
Leo Beiser, Editor(s)

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