Small sized wide angle lens

Details Small sized wide angle lens Small sized wide angle lens

2008-04-22

2008-04-22

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S716000, C359S784000, C359S785000

Reexamination Certificate

active

11198102

ABSTRACT:
A wide angle lens includes, in order from an object side, a first positive convex lens element, a second concavo-convex negative lens element, and a third lens element. The first lens element is made of an optical glass and defines a first convex aspheric surface on the object side and a second plane aspheric surface. The second lens element is made of an optical plastic and defines a third concave aspheric surface on the object side and a fourth convex aspheric surface. The third lens element is made of an optical plastic and defines a fifth high-aperture size convex aspheric surface on the object side and a sixth wave-shaped aspheric surface. Each of the lens elements is symmetrically disposed about an optical axis of the lens. The lens is compact and capable of covering total field angle of up to about 70 degrees.

REFERENCES:
patent: 4620775 (1986-11-01), Fujioka
patent: 6724547 (2004-04-01), Sato
patent: 6795253 (2004-09-01), Shinohara
patent: 2004/0150893 (2004-08-01), Shinohara
patent: 2004212467 (2004-07-01), None

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