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:
Jun. 30, 2009
Filed:
Sep. 12, 2005
Noritoshi Eguchi, Saitama, JP;
Tamotsu Nakano, Kanagawa, JP;
Noritoshi Eguchi, Saitama, JP;
Tamotsu Nakano, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A variable power optical system composed of a first optical part (G) for refraction, a second optical part (G) for reflection or transmission, and a third optical part (G) for refraction, with the first optical part being movable with respect to the second and third optical parts to change the focal length of the entire system, wherein the second optical part or the third optical part has a guidewhich is in contact partly with the first optical part in such a way as to restrict its moving direction and the first optical part is movably held between the second optical part and the third optical part. This structure eliminates the necessity of separately forming the guide to move G. The guideis formed from a synthetic resin integrally with the stationary optical part (G).