Compact lens system

Details Compact lens system Compact lens system

2007-06-26

2007-06-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S785000, C359S790000, C359S740000, C359S708000

Reexamination Certificate

active

11183790

ABSTRACT:
A compact lens system includes, in succession from an object side to an image side, an aspheric first lens element (1) having a positive power, an aperture stop (4), an aspheric second lens element (2) having a negative power, and a third lens element (3) having a positive power. Both the first and second lens elements are meniscus lenses made of plastic, and the third lens element is a biconvex lens or a plano-convex lens made of glass. The first lens element has a convex surface (10) facing the object side and an opposite concave surface (11) facing the aperture stop. The second lens element has a concave surface (21) facing the aperture stop and an opposite convex surface (20) curved toward the image side. The surface (30) of the third lens element facing toward the image side has a radius of curvature larger than that of the other surface (31) facing the second lens element.

REFERENCES:
patent: 4212517 (1980-07-01), Fujii
patent: 4364643 (1982-12-01), Momiyama
patent: 4390252 (1983-06-01), Mori
patent: 4396255 (1983-08-01), Imai
patent: 4426137 (1984-01-01), Mori
patent: 4443070 (1984-04-01), Fujioka
patent: 4448497 (1984-05-01), Wakamiya
patent: 6441971 (2002-08-01), Ning
patent: 6927925 (2005-08-01), Amanai
patent: 6992841 (2006-01-01), Saito et al.

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