Imaging lens

Details Imaging lens Imaging lens

2007-11-13

2007-11-13

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S753000, C359S785000, C359S784000

Reexamination Certificate

active

11727574

ABSTRACT:
An imaging lens comprises, in order from an object side:a first lens having a positive refractive power;a second lens having a negative refractive power whose concave surface faces to the object; anda third lens having a positive refractive power and having a meniscus form that has a convex surface, facing to the object, in a portion at and around an optical axis of the imaging lens;wherein the first, second and third lenses have at least one aspheric surface, andwherein the imaging lens satisfies conditional expressions given below:in-line-formulae description="In-line Formulae" end="lead"?0.7<f1/f<1.3  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.2<D2/f<0.6  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.3<|f2/f|<0.8  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5<f3/f<0.8  (4)in-line-formulae description="In-line Formulae" end="tail"?wheref: a focal length of an overall system,f1: a focal length of the first lens,f2: a focal length of the second lens,f3: a focal length of the third lens, andD2: a spacing, on the optical axis, between the first lens and the second lens.

REFERENCES:
patent: 6961191 (2005-11-01), Sato
patent: 6970306 (2005-11-01), Matsuo
patent: 6977779 (2005-12-01), Shinohara
patent: 7145736 (2006-12-01), Noda
patent: 2004-302058 (2004-10-01), None
patent: 2005-173319 (2005-06-01), None
patent: 2005-227755 (2005-08-01), None
patent: 2005-292235 (2005-10-01), None

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