Scanning optical system

Details Scanning optical system Scanning optical system

2005-10-25

2005-10-25

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S204200, C359S216100, C347S243000, C347S244000, C347S259000

Reexamination Certificate

active

06958839

ABSTRACT:
A scanning optical system is configured to include a light source, an anamorphic optical element, a polygonal mirror, and an imaging optical system. The imaging optical system has a scanning lens including a first lens provided on a polygonal mirror side and a second lens provided on a surface side, and a compensation lens provided on the surface side with respect to the scanning lens, the compensation lens compensating for curvature of field. The scanning lens includes at least one convex surface that has a toric surface having a stronger power in the auxiliary scanning direction than in the main scanning direction. One surface of the compensation lens has an anamorphic aspherical surface, which is a surface whose radius of curvature in the auxiliary scanning direction at a point spaced from the optical axis thereof is determined independently from a cross-sectional shape thereof along the main scanning direction.

REFERENCES:
patent: 5453870 (1995-09-01), Iima
patent: 5541760 (1996-07-01), Iizuka
patent: 7-120693 (1995-05-01), None
patent: 8-122673 (1996-05-01), None
patent: 11287966 (1999-10-01), None

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