Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1999-07-22
2000-11-07
Spyrou, Cassandra
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359205, 359206, 359216, G02B 2608
Patent
active
061444774
ABSTRACT:
In a scanning optical system where a bundle of rays scans a surface to be scanned through an optical deflector and an image forming optical system, the image forming optical system includes a positive front lens group having two lens elements and a rear lens group constituted by an elongated single anamorphic lens element having a strong positive refractive power in the sub scanning direction. All the lens elements in the image forming optical system are made of a resin material, and the scanning optical system satisfies the conditions: (1)d.sub.0 /f<0.23 (2) 0.70<f /f.sub.1 <1.30 (3)d.sub.fB /f<0.50 wherein f designates the focal length of the image forming optical system in the main scanning direction; f.sub.1 designates the focal length of the first lens element of the front lens group; d.sub.0 designates the distance from the intersecting point of the optical axis of the bundle of rays being emitted from the light source and incident on the optical deflector and the optical axis of the image forming optical system to the first lens surface, on the side of the optical deflector, of the image forming optical system; and d.sub.fB designates the distance between the surface to be scanned and the last lens surface of the rear lens group closest to the surface to be scanned.
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Asahi Kogaku Kogyo Kabushiki Kaisha
Boutsikaris Leo
Spyrou Cassandra
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