Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-11-16
2009-08-11
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S665000, C359S694000, C359S696000, C359S703000
Reexamination Certificate
active
07573648
ABSTRACT:
In this invention, to provide a compact zoom lens having a small number of optical element groups to be driven and a simple moving mechanism, at least one of a plurality of optical element groups arranged in the lens system includes a refractive power variable element of a transmission type which has a compensation function to correct focus movement caused by zooming and a focus function to correct focus movement caused by a variation in inter-object distance. The refractive power variable element is a liquid optical element including a first liquid having a conductivity or a polarity and a second liquid which is not mixed with the first liquid, the first liquid and the second liquid being enclosed in a container fluid-tight so as to define an interface therebetween having a predetermined shape, the liquid optical element being arranged such that a refractive power thereof is adjusted by changing a curvature of the interface.
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Atarashi Yuuichi
Kogo Shoji
Sato Hiroshi
Sato Masae
Yamaguchi Susumu
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Konica Minolta Opto Inc.
Lester Evelyn A.
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