Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-07-11
1999-12-14
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347248, 347259, 347261, 358483, H04N 1047
Patent
active
060024216
ABSTRACT:
A fast scan error measuring system of a raster output scanner (ROS) is provided in order to determine whether the laser beam position in the fast scan direction is within acceptable operational parameters. A detector, for example, a linescan or area array camera, is used to acquire multiple successive images from each facet of the ROS as the unit is operating. For each rotating facet the position of a beam spot (centroid) at the end of scan line is measured. A sufficient number of centroids are collected so that a Fourier transform of the centroids will produce an accurate spatial frequency spectrum measured in cycles per millimeter. This spectrum can be easily compared to the product's fast scan error specification limits.
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patent: 4978949 (1990-12-01), Goddard et al.
patent: 5359434 (1994-10-01), Nakao et al.
patent: 5363126 (1994-11-01), Andrews
Ossman Kenneth R.
Russell, Jr. Melvin J.
Cox Diana
Le N.
Pham Hai C.
Xerox Corporation
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