Imaging lens

Details Imaging lens Imaging lens

2007-09-28

2009-12-22

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

Reexamination Certificate

active

07636206

ABSTRACT:
An imaging lens including, in order from an object side to an image surface side on an optical axis, a first lens that is a meniscus lens having a positive power whose convex surface faces the object side, a diaphragm, a second lens that is a meniscus lens having a positive power whose convex surface faces the image surface side, and a third lens that is a biconcave lens having a negative power, wherein conditions expressed by 0.023≦d4/fl≦0.11 and 0.068<f1/f2≦0.8 (where, d4: distance between the second lens and the third lens on the optical axis, f1: focal distance of the entire lens system, f1: focal distance of the first lens, and f2: focal distance of the second lens) are to be satisfied.

REFERENCES:
patent: 7006305 (2006-02-01), Amanai
patent: 2005/0030645 (2005-02-01), Do
patent: 2007/0109668 (2007-05-01), Isono
patent: 2003-322792 (2003-11-01), None
patent: 2004-163786 (2004-06-01), None
patent: 2005-091513 (2005-04-01), None
patent: 2005-173298 (2005-06-01), None

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