Optical scanning apparatus and image forming apparatus using...

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

Reexamination Certificate

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C347S134000

Reexamination Certificate

active

11056285

ABSTRACT:
An optical scanning apparatus can satisfactorily correct a field curvature caused by spherical aberration in an incidence optical system. A light beam emitted from a light source is guided to an optical deflector for deflecting the light beam through a first optical system having a collimating operation, and a second optical system including a surface having a beam expanding operation and an aspherical operation for compensating for aberration in order. When the light beam deflected by the optical deflector is guided to a surface to be scanned through a third optical system, the light beam emitted from the light source is converted into a nearly collimated light beam through the first and second optical systems within a main scanning cross-section and is made incident on a deflecting surface of the optical deflector to make its width wider than that of the deflecting surface thereof in a main scanning direction. Thus, a surface of the second optical system having an aspherical operation compensates for a spherical aberration generated in the first optical system.

REFERENCES:
patent: 5757535 (1998-05-01), Ichikawa
patent: 5940663 (1999-08-01), Mizunuma et al.
patent: 6268877 (2001-07-01), Sato et al.
patent: 6927883 (2005-08-01), Fujimoto
patent: 2004/0263979 (2004-12-01), Kimura
patent: 2001-59946 (2001-03-01), None
patent: 2002-267976 (2002-09-01), None

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