Imaging lens

Details Imaging lens Imaging lens

2008-05-13

2008-05-13

Mai, Huy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S717000

Reexamination Certificate

active

07372644

ABSTRACT:
An imaging lens including, in order from an object side towards an image surface side, a diaphragm, a first lens which is a meniscus lens having a positive power whose convex surface faces the object side, and a second lens which is a lens having a positive power whose convex surface faces the image surface side, wherein conditions expressed by each of following expressions (1)-(6) are to be satisfied; 1.25≧L/fl≧0.8, 1≧f1/f2≧0.2, 1.8≧f1/fl≧1, 0.5>d2/d1≧0.2, 0.35≧d1/fl≧0.1, and 0.27≧d3/fl≧0.1 (where, L: entire length of the lens system, fl: focal distance of the 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: space between the first lens and the second lens on the optical axis, and d3: center thickness of the second lens).

REFERENCES:
patent: 7164545 (2007-01-01), Saito
patent: 7180685 (2007-02-01), Wang et al.
patent: 8-334684 (1996-12-01), None
patent: 2004-163850 (2004-06-01), None
patent: 2004-170460 (2004-06-01), None

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