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:
Dec. 07, 2010
Filed:
Feb. 20, 2009
Hiroki Yamano, Kanagawa, JP;
SO Miyasaka, Tokyo, JP;
Kazuya Watanabe, Saitama, JP;
Sony Corporation, Tokyo, JP;
Tamron Co., Ltd., Saitama-shi, JP;
Abstract
A retractable zoom lens includes sequentially from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. The third lens group includes sequentially from the object side, a first lens that is a positive lens, a second lens that is a positive lens, and a third lens that is a negative lens. The retractable zoom lens performs variable magnification by independently moving the respective lens groups along the optical axis. Further, the retractable zoom lens satisfies given conditions and maintains high optical performance while enabling a wider angle and a reduction of overall length.