FAST SCAN JITTER MEASURING SYSTEM FOR RASTER SCANNERS
Original Publication Date: 1985-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Pixel registration errors in raster output scanners or ROS's as they are sometimes called, require detection and quantification during manufacturing of the scanner and later when the scanner is in service. Such errors when in the fast scan direction are usually indicative of an underlying fault or marginal failure in the scanner with the result that copy quality degrades. The usual scanner failures which are evidenced by fast scan jitter are velocity variations in the scanner scanning element, scratched or dirty optical elements, misalignment of optical components, scan detection failures, and pixel clock circuit failures. If fast scan jitter could be readily detected and quantified, such scanner failures could be more readily detected, identified, and corrected; both while the scanner is being manufactured and later in the field when the scanner is in service.