Laser scanning optical system and image forming apparatus using

Details Laser scanning optical system and image forming apparatus using Laser scanning optical system and image forming apparatus using

1998-10-14

2000-08-15

Spyrou, Cassandra

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359206, 359207, 359217, 359711, G02B 2608, G02B 306

Patent

active

061045209

ABSTRACT:
A laser scanning optical system includes a light source, a polygonal mirror for deflecting a light beam emitted by the light source, and a scanning lens system for guiding the light beam deflectively reflected by the polygonal mirror to a surface to be scanned. The scanning lens system has a spherical lens, and a toric lens which is formed of a plastic material having a positive refractive power in both main scanning and sub-scanning directions. At least one surface of the toric lens has an aspherical shape which is substantially perpendicular to a light beam, which has been transmitted through the spherical lens, in a main scanning section.

REFERENCES:
patent: 5557449 (1996-09-01), Miyagawa et al.
patent: 5774250 (1998-06-01), Shimada et al.

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