Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-06-22
1983-05-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
346108, 358298, H01J 314
Patent
active
043862721
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 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: 4214157 (1980-07-01), Check et al.
"Technology of Asynchronous Ink Jet Printing" by Koebiltz, Soc. Phat. Sci. & Eng., 1974, pp. 179-181.
Check, Jr. Frank T.
Sansone Ronald P.
Nelms David C.
Pitney Bowes Inc.
Scolnick Melvin J.
Scribner Albert W.
Vrahotes Peter
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