Optical scanning system with reduced spherical aberration...

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Reexamination Certificate

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Details

C359S197100, C359S215100, C359S216100, C347S259000

Reexamination Certificate

active

07550712

ABSTRACT:
An optical scanning system and an image forming apparatus having the same. The optical scanning system includes a light source, a deflector, an input optical system for directing a light beam from the light source to the deflector, and an imaging optical system for directing the light beam deflected by the deflector onto a surface to be scanned. The input optical system includes a first optical element having a power both in a main-scan sectional plane and in a sub-scan sectional plane, and a second optical element having a power in the sub-scan sectional plane. At least one surface of the first optical element has a shape being rotationally asymmetrical and, in the sub-scan sectional plane, being non-arcuate.

REFERENCES:
patent: 6833940 (2004-12-01), Suzuki et al.
patent: 7050210 (2006-05-01), Atsuumi
patent: 7142339 (2006-11-01), Tomioka
patent: 7336406 (2008-02-01), Kato
patent: 7362486 (2008-04-01), Hayashi et al.
patent: 2003/0128440 (2003-07-01), Kimura
patent: 2004/0001241 (2004-01-01), Hayashi et al.
patent: 2004/0156084 (2004-08-01), Takayama
patent: 2005/0094233 (2005-05-01), Tomioka
patent: 2005/0225819 (2005-10-01), Atsuumi et al.
patent: 2007/0081152 (2007-04-01), Amada
patent: 11-6954 (1999-01-01), None

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