H - Electricity – 01 – J
Patent
H - Electricity
01
J
350/19, 345/55,
H01J 3/14 (2006.01) G02B 26/12 (2006.01) G02B 27/00 (2006.01) H04N 1/047 (2006.01) H04N 1/113 (2006.01) H04N 1/12 (2006.01)
Patent
CA 1145170
APPARATUS AND METHOD FOR CORRECTING IMPERFECTION IN A POLYGON USED FOR LASER SCANNING Abstract of the Disclosure An electro-optical light scanning system using a modulated laser illumination source directed upon a multifacated rotating polygonal mirror or polygon. The mirrored facets reflect the impinging light toward a moving photoreceptor and forms a raster of scan lines as the photoreceptor moves. The system incorporates sensing optics and closed loop electronics for correcting inac- curacies in the position of the reflected light resulting from defects in the angular relationship between the plane of the facets and that of the rotating axis of the polygon as well as those errors due to inherent angular misalignment between each of the facets of the rotating polygon. The invention also encompasses amplitude modulation for varying the intensity of the laser il- lumination in conjunction with the acousto-optical modulation for maintaining a constant level illumination and/or for varying the spot size.
330099
Check Frank T.
Sansone Ronald P.
Macrae & Co.
Pitney-Bowes Inc.
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