F-theta lens and laser scanning unit including the same

Details F-theta lens and laser scanning unit including the same F-theta lens and laser scanning unit including the same

2006-02-07

2006-02-07

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

High distortion lens

C359S206100

Reexamination Certificate

active

06995919

ABSTRACT:
An f-theta lens and a laser scanning unit including the same are provided. The f-theta lens for a laser scanning unit includes a lens body that to focus incident light onto a scanning surface, and ribs formed on opposite sides of the lens body to protect the lens body, wherein the ribs have variable heights corresponding to a peak height of the lens body such that the ribs are higher than the peak of the lens body at a convex portion of the lens body and lower than the peak of the lens body at a concave portion of the lens body.

REFERENCES:
patent: 5751463 (1998-05-01), Inoue et al.
patent: 5808775 (1998-09-01), Inagaki et al.
patent: 6657761 (2003-12-01), Suzuki et al.
patent: 62-255915 (1987-11-01), None
patent: 5-11201 (1993-01-01), None
patent: 5-134197 (1993-05-01), None
patent: 05-188285 (1993-07-01), None
patent: 5-188285 (1993-07-01), None
patent: 05188285 (1993-07-01), None
patent: 94-19474 (1994-08-01), None
Office Action dated Jul 8, 2005 of the Chinese Patent Application No. 200410048463.1.

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