The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2008
Filed:
Mar. 11, 2005
Shoji Kogo, Tokyo, JP;
Masae Sato, Tokyo, JP;
Susumu Yamaguchi, Tokyo, JP;
Hiroshi Sato, Tokyo, JP;
Yuuichi Atarashi, Tokyo, JP;
Shoji Kogo, Tokyo, JP;
Masae Sato, Tokyo, JP;
Susumu Yamaguchi, Tokyo, JP;
Hiroshi Sato, Tokyo, JP;
Yuuichi Atarashi, Tokyo, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
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.