Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-03-14
1982-01-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 67, 358267, H01J 314
Patent
active
043107575
ABSTRACT:
An electro-optical light scanning system using a modulated laser illumination source directed upon a multifaceted 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 inaccuracies 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 speed control as well as amplitude modulation for varying the intensity of the laser illumination in conjunction with the acousto-optical modulation for maintaining a constant level illumination and/or for varying the spot size.
REFERENCES:
patent: 4017146 (1977-04-01), Lichtman
patent: 4130838 (1978-12-01), St. John
patent: 4140903 (1979-02-01), Clark
Check, Jr. Frank T.
Sansone Ronald P.
Nelms David C.
Pitney Bowes Inc.
Scribner Albert W.
Soltow, Jr. William D.
Vrahotes Peter
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