Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2007-12-04

2007-12-04

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S753000

Reexamination Certificate

active

11337706

ABSTRACT:
A wide-angle lens system includes: from the object side, (1) a first lens element formed of glass having both surfaces thereof so formed as to be spherical, having a meniscus shape convex to the object side, and having a negative optical power; (2) a second lens element formed of plastic having a meniscus shape convex to the image side and having a positive optical power; (3) an aperture stop; and (4) a third lens element formed of plastic having a meniscus shape convex to the image side and having a positive optical power, and the wide-angle lens system includes three lens elements in total. This permits providing a low-cost, compact super-wide-angle lens system having a favorable optical performance.

REFERENCES:
patent: 5675440 (1997-10-01), Kanamori
patent: 2004/0021958 (2004-02-01), Mizuguchi
patent: 2005/0024737 (2005-02-01), Takeuchi
patent: 2006/0227434 (2006-10-01), Hirose et al.
patent: 2109580 (1992-07-01), None
patent: 6-34879 (1994-02-01), None
patent: 2001-337268 (2001-12-01), None
patent: 2004-102162 (2004-04-01), None
Chinese “The Second Office Action”, dated Jul. 27, 2007, for counterpart Chinese Patent Application No. 200610004669.3, along with and English-translation thereof.

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