Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-05-15
2000-06-20
Spyrou, Cassandra
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359216, G02B 2608
Patent
active
060784199
ABSTRACT:
An optical scanning apparatus includes a light source unit for emitting a light beam, an image-forming lens for imaging the light beam in a main-scanning direction, a beam deflector for reflecting and deflecting a line image produced by the image-forming lens, a reflective optical system including a plurality of reflecting mirrors for reflecting a deflected light beam incident on the reflective optical system a plurality of times, wherein reflecting surfaces of the plurality of reflecting mirrors are tilted with respect to a system axis of the optical scanning apparatus, the reflective optical system includes an image-forming mirror for converging the deflected light beam to form a beam spot for scanning a scanned surface at a constant velocity, and the image-forming mirror has an anamorphic configuration obtained by rotating a curve drawn with a first radius on a main-scanning plane, around an axis residing on the main-scanning plane and parallel with the main-scanning direction maintaining a second radius.
REFERENCES:
patent: 5751464 (1998-05-01), Yoshikawa et al.
patent: 5805323 (1998-09-01), Ichikawa
Cherry Euncha
Ricoh & Company, Ltd.
Spyrou Cassandra
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