Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

1997-09-05

1999-11-09

Spyrou, Cassandra

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359868, G02B 2608, G02B 510

Patent

active

059825243

ABSTRACT:
The present invention is intended to reduce a f.theta. correction error by correcting an error of an object scanning speed which is produced because a reflecting point of a laser beam moves on a polygon mirror. In an inventive laser scanner, laser light emitted from a laser oscillator is condensed into a beam by a condenser lens at first. This laser beam is reflected by a polygon mirror rotated by a scanning section and is reflected again to a photoreceptor by a curved reflecting mirror. A curved profile of a reflecting plane of the curved reflecting mirror in the main scanning direction is formed so as to be asymmetrical on right and left bounding about a scanning center point. Thereby, variation of speed for scanning the curved reflecting mirror by the light reflected by the polygon mirror may be canceled by the curved reflecting mirror and a speed for scanning the object may be fixed almost at a predetermined speed.

REFERENCES:
patent: 4398787 (1983-08-01), Balasubramanian
patent: 5025268 (1991-06-01), Arimoto et al.
patent: 5353047 (1994-10-01), Nakamura et al.

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