Imaging lens

Details Imaging lens Imaging lens

2007-11-13

2007-11-13

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S739000

Reexamination Certificate

active

11580422

ABSTRACT:
It is to provide an imaging lens that maintains optical performance and achieves reduction in size and weight. The imaging lens comprises, in order from an object side towards an image surface side, a first lens which is a meniscus lens having a positive power whose convex surface faces the object side, a diaphragm, a second lens which is a meniscus lens having a positive power whose convex surface faces the image surface side, and a third lens which is a biconcave lens having a negative power, wherein the following conditions are to be satisfied; 1.3≧L/fl≧1, 0.8≧f1/fl≧0.6, 0.12≧f1/f2>0, −0.1≧f1/f3≧−0.25 (where, L: entire length of the lens system [distance from the surface of the object side of the first lens to the image taking surface [air reduced length]], fl: focal distance of the entire lens system, f1: focal distance of the first lens, f2: focal distance of the second lens, and f3: focal distance of the third lens).

REFERENCES:
patent: 6222682 (2001-04-01), Saito et al.
patent: 6560043 (2003-05-01), Saito et al.
patent: 2003-322792 (2003-11-01), None
patent: 2004-163786 (2004-06-01), None
patent: 2005-91513 (2005-04-01), None
patent: 2005-173298 (2005-06-01), None

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