Imaging lens

Details Imaging lens Imaging lens

2007-03-27

2010-11-09

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S791000, C359S716000

Reexamination Certificate

active

07830622

ABSTRACT:
An imaging lens comprises, in order from an object side: an aperture stop; a first lens having a positive refractive power in a meniscus form having a convex surface facing toward the object; a second lens having a positive or negative refractive power in a meniscus form having a concave surface facing toward the object; and a third lens having a positive or negative refractive power in an aspheric form at both surfaces, wherein conditional expressions given below are satisfied:in-line-formulae description="In-line Formulae" end="lead"?νd1>50  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?νd3>50  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.7<f1/f<1.0  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.9<f2/{f3·(45−νd2)}<0.4  (4)in-line-formulae description="In-line Formulae" end="tail"?whereνd1: Abbe number of the first lens,νd2: Abbe number of the second lens,νd3: Abbe number of the third lens,f: Focal length of an overall system,f1: focal length of the first lens,f2: focal length of the second lens, andf3: focal length of the third lens.

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European Patent Office Communication pursuant to Article 94(3), dated Aug. 7, 2009.

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