Variable power optical system, image pickup lens device, and...

Details Variable power optical system, image pickup lens device, and... Variable power optical system, image pickup lens device, and...

2007-02-06

2007-02-06

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

11130495

ABSTRACT:
Three or more lens groups including a negative first lens group and a positive second lens group in this order from an object side are provided. The first lens group is composed of two or more lenses. At least three lens groups are composed of single lens elements, namely, only a single lens, a cemented lens, or a lens in which adjacent lenses are integrated with each other in a fixed manner. This variable power optical system has a power ratio of about two to three, and is compact and high-definition.

REFERENCES:
patent: 5009491 (1991-04-01), Hata
patent: 5798871 (1998-08-01), Shibayama et al.
patent: 6349002 (2002-02-01), Shibayama et al.
patent: 6816320 (2004-11-01), Wada
patent: 2002/0027721 (2002-03-01), Mihara
patent: 07-306362 (1995-11-01), None

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