Photographing lens

Details Photographing lens Photographing lens

2006-01-10

2006-01-10

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S792000, C359S753000

Reexamination Certificate

active

06985306

ABSTRACT:
The photographing lens of the present invention includes, starting from the object side: an aperture stop having a predetermined aperture; a first lens group having a positive overall refractive power; a second lens group having a positive overall refractive power; and a third lens group having a positive overall refractive power. The first lens group is a cemented lens with, from the object side, a first lens with a positive refractive power and a second lens with a negative refractive power. The second lens group includes a third lens with a positive refractive power and at least one aspherical surface. The third lens group includes a fourth lens with a positive refractive power and at least one aspherical surface. The present invention provides a thin photographing lens for mobile devices with cameras, which has a short total length and an exit angle up to around 20° and corrects various aberrations.

REFERENCES:
patent: 4060306 (1977-11-01), Swaminathan
patent: 5701475 (1997-12-01), Sugawara
patent: 6728047 (2004-04-01), Sato et al.
patent: 05-040220 (1993-02-01), None
patent: 05-157962 (1993-06-01), None
patent: 2000-171697 (2000-06-01), None
patent: 2001-133684 (2001-05-01), None
patent: 2002-098888 (2002-04-01), None
patent: 2002-162561 (2002-06-01), None
Patent Abstracts of Japan for JP2002-162561 published on Jun. 7, 2002.
Patent Abstracts of Japan for JP2002-098888 published on Apr. 5, 2002.
Patent Abstracts of Japan for JP2001-133684 published on May 18, 2001.
Patent Abstracts of Japan for JP2000-171697 published on Jun. 23, 2000.
Patent Abstracts of Japan for JP05-157962 published on Jun. 25, 1993.
Patent Abstracts of Japan for JP05-040220 published on Feb. 19, 1993.

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