High zoom ratio zoom lens, optical apparatus using the same,...

Details High zoom ratio zoom lens, optical apparatus using the same,... High zoom ratio zoom lens, optical apparatus using the same,...

2007-07-20

2009-02-17

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S715000, C359S740000, C359S774000, C359S557000

Reexamination Certificate

active

07492526

ABSTRACT:
A high-zoom-ratio zoom lens having superb optical performance despite compactness and a high zoom ratio. The lens includes, in order from an object, a first group having positive power; a second group having negative power; a third group having positive power; and a fourth group having positive power. The third group includes, in order from the object, a first positive lens having a convex surface facing the object, a second positive lens having a convex surface facing the object, a double concave negative lens having a radius of curvature of the image side surface smaller than that of the object side surface, and a third positive lens having a double convex shape. Any of lens surfaces composing the third group is an aspherical surface. Upon zooming from a wide-angle end to a telephoto end, all groups moving along the optical axis. Given condition is satisfied.

REFERENCES:
patent: 6441968 (2002-08-01), Okayama et al.
patent: 6650475 (2003-11-01), Hamano
patent: 7139131 (2006-11-01), Nanba et al.
patent: 7253964 (2007-08-01), Muratani
patent: 7253965 (2007-08-01), Shibayama et al.
patent: 2006/0056053 (2006-03-01), Muratani
patent: 2007/0070524 (2007-03-01), Sato
patent: 2005-257868 (2005-09-01), None

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