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:
May. 14, 2013
Filed:
Oct. 07, 2011
Takuya Anzawa, Kanagawa, JP;
Shinichi Arita, Tokyo, JP;
Takuya Anzawa, Kanagawa, JP;
Shinichi Arita, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A zoom lens includes a first lens group with positive refracting power and normally located at a fixed position, a second lens group with negative refracting power and movable in an optical axis direction for zooming, a third lens group with positive refracting power and normally located at a fixed position, a fourth lens group with positive refracting power and movable in the optical axis direction for correction of a focal position for zooming and focusing, and a fifth lens group. These lens groups are arranged in order from an object side to an image side. The zoom lens satisfies the conditional equations (1) 1.00<f3/f4<2.49 and (2) 1.00<|fw1˜2/f2|<1.50, where f2 to f4 are focal lengths of the second to fourth lens groups, and fw1˜2 is a synthetic focal length of the first and second lens groups at the wide-angle end.