Photographing lens

Details Photographing lens Photographing lens

2006-01-31

2006-01-31

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000

Reexamination Certificate

active

06992840

ABSTRACT:
A photographing lens includes an aperture stop having a predetermined aperture, a first lens having a positive refractive power and a convex surface facing the object side, a second lens having a positive refractive power and aspherical surfaces on both sides, the object-side aspherical surface being concave, and a third lens having a negative refractive power and aspherical surfaces on both sides, the object side surface being convex. The aperture stop and the first, second, and third lenses are arranged in order from the object side toward the image-plane side. With such a three-unit, three element lens configuration, a proper back focus is ensured, aberrations are properly corrected, and the total lens length and thickness of the photographing lens are reduced. The photographing lens can be suitably applied to high-resolution image pickup devices with a million pixels or more.

REFERENCES:
patent: 6476982 (2002-11-01), Kawakami
patent: 05-040220 (1993-02-01), None
patent: 05-157962 (1993-06-01), None
patent: 5-188284 (1993-07-01), 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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