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. 30, 2014
Filed:
Feb. 08, 2013
Sony Corporation, Tokyo, JP;
Takeshi Hatakeyama, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
A zoom lens includes a fixed first lens group having a positive refracting power, a second lens group having a negative refracting power and movable along an optical axis, a fixed third lens group having a positive refracting power, a fourth lens group having a negative refracting power and movable along the optical axis, and a fixed fifth lens group, disposed in order from the object side to the image side. The following expressions are satisfied:0.5<f1/(fw·ft)<1.8−0.4<f3/f5<0.4where f, fw, ft, fand fare focal lengths of the first lens group, the entire lens system in a wide angle end state, the entire lens system in a telephoto end state, the third lens group and the fifth lens group, respectively.