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:
Feb. 01, 2011
Filed:
Mar. 04, 2010
Takumi Matsui, Tokyo, JP;
Makoto Kanai, Tokyo, JP;
Daisuke Kuroda, Kanagawa, JP;
Hiroki Yamano, Tokyo, JP;
Takumi Matsui, Tokyo, JP;
Makoto Kanai, Tokyo, JP;
Daisuke Kuroda, Kanagawa, JP;
Hiroki Yamano, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A zoom lens includes a negative first lens group, a positive second lens group, and a positive third lens group; wherein, when changing power from a wide-angle end state to a tele end state, the first lens group moves such that air space between the first lens group and the second lens group decreases, and air space between the second lens group and the third lens group increases, and the second lens group moves toward the object side; and wherein the first lens group includes a negative lens with both faces formed aspherically and the concave face facing the image side, and a positive meniscus lens with at least one face formed aspherically and the convex face facing the object side, satisfying2.8<|f1/fw|<3.3where frepresents the focal length of the first lens group, and fw represents the entire focal length in the wide-angle end state.