Imaging lens system

Details Imaging lens system Imaging lens system

2007-01-16

2007-01-16

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S717000

Reexamination Certificate

active

11250999

ABSTRACT:
The imaging lens system includes, from the object side, a diaphragm, a first lens as a positive meniscus lens whose convex surface faces the object side, and a second lens as a positive lens whose convex surface faces the image surface side, wherein the following expressions are to be satisfied 1.25≧L/fl≧0.8, 0.55≧f1/f2s 0.2, 1.8≧f1/fl≧1, 4≧f2/fl≧1.5, 1≧d2/d1≧0.5, 0.27≧d1/fl≧0.1, 0.27≧d3/fl≧0.1 (where, L: entire length of the lens system, fl: focal distance of entire lens system, f1: focal distance of the first lens, f2: focal distance of the second lens, d1: center thickness of the first lens, d2: distance between the first lens and second lens on the optical axis, d3: center thickness of the second lens).

REFERENCES:
patent: 5978159 (1999-11-01), Kamo et al.
patent: 2004/0165278 (2004-08-01), Cahall
patent: 2005/0157408 (2005-07-01), Do et al.
patent: 2004-170460 (2004-06-01), None

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