Retrofocus, wide-angle lens

Details Retrofocus, wide-angle lens Retrofocus, wide-angle lens

2005-05-17

2005-05-17

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S680000

Reexamination Certificate

active

06894847

ABSTRACT:
A retrofocus, wide-angle lens includes a first lens group of negative refractive power, a stop, and a second lens group of positive refractive power. The first lens group includes, in order from the object side, a meniscus lens elements having positive refractive power, two meniscus lens elements having negative refractive power, and a thick lens element. The second lens group includes a cemented lens component that includes a lens element having negative refractive power and a biconvex lens element that is on the object side of a meniscus lens element having negative refractive power with its concave surface on the object side. The second lens group may include a meniscus lens component having positive refractive power on the object side of the biconvex lens element and a meniscus lens component having positive refractive power on the image side of the meniscus lens element having negative refractive power.

REFERENCES:
patent: 3884556 (1975-05-01), Nakagawa
patent: 5159493 (1992-10-01), Tsutsumi
patent: 6621645 (2003-09-01), Sato
patent: S57-158609 (1982-09-01), None
patent: H7-261076 (1995-10-01), None
patent: 2002-214526 (2002-07-01), None

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