Imaging lens

Details Imaging lens Imaging lens

2008-03-11

2008-03-11

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S716000

Reexamination Certificate

active

07342729

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"?0.3<D2/f<0.5   (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0<|f2/f|<3.0   (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.2<f3/f<4.0   (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.

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