Imaging lens, camera module, and portable terminal apparatus

Details Imaging lens, camera module, and portable terminal apparatus Imaging lens, camera module, and portable terminal apparatus

2008-02-15

2010-02-09

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000

Reexamination Certificate

active

07660050

ABSTRACT:
An imaging lens comprises, in order from an object side: a first lens having a positive refractive power and a meniscus shape and having a convex surface directed to the object side; a second lens having a negative refractive power in the vicinity of an optical axis of the imaging lens; and a third lens having a positive refractive power in the vicinity of the optical axis, wherein at least one surface of each of the second lens and the third lens is an aspheric surface; and the imaging lens satisfies the following conditional expression expressions: 0.7 <If1/fl <0.8 . . . (1) 0.3<1f2/fl <0.8 . . . (2) 7.5 <vd1<96 . . .(3) TL/2Y <0.9 . . . (4) where f: focal length of the imaging lens; f1: focal length of the first lens; f2: focal length of the second lens; vd1: Abbe number of the first lens for the d-line; TL: length between the object-side surface of the first lens to an image forming position of the imaging lens; and Y: maximum image height.

REFERENCES:
patent: 6961191 (2005-11-01), Sato et al.
patent: 2005/0275950 (2005-12-01), Kubota et al.
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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