Large aperture wide-angle lens and camera including large...

Details Large aperture wide-angle lens and camera including large... Large aperture wide-angle lens and camera including large...

2007-06-05

2007-06-05

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S749000

Reexamination Certificate

active

11152061

ABSTRACT:
A large aperture wide-angle lens includes first and second lens groups separated by a stop. The first lens group includes more than one lens element and the second lens group includes, in order from the object side, a first lens component having at least one aspheric surface, having negative refractive power, and having increasingly negative refractive power toward the periphery, a second lens component having a convex surface on the image side, and a third lens component having at least one aspheric surface and having decreasingly positive refractive power or increasingly negative refractive power toward the periphery. The large aperture wide-angle lens includes six or seven lens components and seven lens elements, and preferably satisfies specified conditions related to f-number and focal length of the wide-angle lens, the maximum image height at the image surface, and the index of refraction of the object-side lens element of the second lens group.

REFERENCES:
patent: 5579172 (1996-11-01), Aoki et al.
patent: 5760973 (1998-06-01), Kawamura
patent: 5946144 (1999-08-01), Yamamoto
patent: 6940662 (2005-09-01), Sekita
patent: 9-236746 (1997-09-01), None
patent: 11-326756 (1999-11-01), None
patent: 2000-321490 (2000-11-01), None
patent: 2001-124985 (2001-05-01), None

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