Scanning lens unit and optical scanning apparatus including...

Details Scanning lens unit and optical scanning apparatus including... Scanning lens unit and optical scanning apparatus including...

2006-07-11

2006-07-11

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S205100, C347S244000

Reexamination Certificate

active

07075689

ABSTRACT:
The scanning lens unit includes lenses located between a optical deflector and a lens having a k-th lens surface Skfrom a first lens surface S1closest to the deflector are disposed such that a height of a lens having the lens surface Skdenoted by πksatisfies the predetermined expression. each of lenses located between the first lens surface S1and the k-th lens surface Skis a cylindrical lens having power only in the determined deflection direction. Therefore, the lenses can individually have minimum thicknesses, as a result, the cost reduction of the scanning lens unit is realized. The optical scanning apparatus includes the scanning lens and hence can achieve cost reduction.

REFERENCES:
patent: 6696681 (2004-02-01), Kodama
patent: 2002/0030158 (2002-03-01), Kodama
patent: 2002-107647 (2002-04-01), None

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