Browse Prior Art Database

POLYGON MOTOR ANTIHUNTING CONTROL TECHNIQUE

IP.com Disclosure Number: IPCOM000024424D
Original Publication Date: 1980-Aug-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal

Abstract

Raster output scanning systems have a problem with pixel misregistration due to variations in the scanning velocity of the laser beam. A portion of the laser beam velocity variation is due to hunting of the polygon drive motor. Attempts to compensate for laser beam velocity variations including polygon motor hunting have employed the technique of controlling the rate at which digital data is transmitted to the optical modulator. In these systems, laser beam velocity variations are optically sensed by start-of-scan and end-of -scan photodetectors and compensated for by increasing or decreasing the data rate.