Scanning optical system

Details Scanning optical system Scanning optical system

2005-10-18

2005-10-18

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S216100, C359S206100, C347S259000

Reexamination Certificate

active

06956686

ABSTRACT:
A scanning optical system includes a light source, an anamorphic optical element, a polygonal mirror, and an imaging optical system that converges the beam(s) on a surface to be scanned. The imaging optical system has a scanning lens, and a compensation lens provided on the surface side for compensating for curvature of field. All the surfaces of the scanning lens are rotationally symmetrical, and the compensation lens has an aspherical surface. A cross section of the aspherical surface in the auxiliary scanning direction is asymmetrical with respect to the optical axis thereof, and a SAG amount defining the aspherical surface is expressed by a two-dimensional polynomial.

REFERENCES:
patent: 6437897 (2002-08-01), Inagaki
patent: 6466350 (2002-10-01), 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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