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:
Apr. 12, 2011
Filed:
Dec. 29, 2009
Motoyuki Ohtake, Saitama, JP;
Masayuki Murata, Tokyo, JP;
Hiroshi Omichi, Tokyo, JP;
Hiroki Hagiwara, Tokyo, JP;
Motoyuki Ohtake, Saitama, JP;
Masayuki Murata, Tokyo, JP;
Hiroshi Omichi, Tokyo, JP;
Hiroki Hagiwara, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A variable focal length lens system includes first to fourth lens groups which have positive, negative, positive, and positive refractive powers, respectively, and are arranged in this order from an object side to an image side. An aperture diaphragm is arranged in the vicinity of the third lens group. The variable focal length lens system satisfies the following Conditional expressions 1 and 2:−0.04<23<0.18, and  [Conditional expression 1]0.48<24<0.72  [Conditional expression 2]