Imaging lens

Details Imaging lens Imaging lens

2007-03-20

2007-03-20

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000, C359S740000

Reexamination Certificate

active

11071417

ABSTRACT:
An imaging lens includes, in sequence from the object side to the image plane side: a first lens with a convex object side surface and having a positive overall index of refraction; an aperture stop having a predetermined diameter; a second lens with a convex object side surface and having an overall positive index of refraction; and a third lens with a concave object side surface and an overall negative index of refraction. At least one surface of the first lens is formed as an aspherical surface. Both surfaces of the third lens are formed as aspherical surfaces, with the image side surface having an inflection point at which the curvature of the surface changes within the effective diameter range. The imaging lens provides superior optical characteristics and is compact and suited for use in mobile cameras installed in portable telephones, PDAs, and the like.

REFERENCES:
patent: 4548480 (1985-10-01), Yamamoto et al.
patent: 4810075 (1989-03-01), Fukuda
patent: 2004/0196575 (2004-10-01), Nozawa
patent: 2005/0030645 (2005-02-01), Do
patent: 07-168095 (1995-07-01), None
patent: 11-052227 (1999-02-01), None
patent: 2001-133684 (2001-05-01), None
patent: 2002-098888 (2002-04-01), None
Patent Abstracts of Japan for JP2002-098888 published Apr. 5, 2002.
Patent Abstracts of Japan for JP2001-133684 published May 18, 2001.
Patent Abstracts of Japan for JP11-052227 published Feb. 26, 1999.
Patent Abstracts of Japan for JP07-168095 published Jul. 4, 1995.

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