Imaging lens

Details Imaging lens Imaging lens

2009-10-21

2011-12-13

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S793000

Reexamination Certificate

active

08077402

ABSTRACT:
It is to provide an imaging lens that can improve optical performance while reducing size and weight.An imaging lens includes, in order from an object side to an image surface side, a diaphragm, a first lens that is a biconvex lens, and a second lens that is a lens having a negative power whose concave surface faces the object side, wherein conditions expressed by the following expressions are to be satisfied: −0.3≦r1/r2<−0.1 and 0.8≦f1/FL≦0.98 (where, r1: center radius curvature of the object side face of the first lens, r2: center radius curvature of the image surface side face of the first lens, f1: focal distance of the first lens, and FL: focal distance of the entire lens system).

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patent: 6813100 (2004-11-01), Yamaguchi et al.
patent: 7035024 (2006-04-01), Nagai et al.
patent: 2004-170883 (2004-06-01), None
patent: 2006-119331 (2006-05-01), None

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