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. 19, 2013
Filed:
Sep. 12, 2011
Tsuneo Uchida, Chiba, JP;
Koji Hoshi, Kanagawa, JP;
Tsuneo Uchida, Chiba, JP;
Koji Hoshi, Kanagawa, JP;
Panasonic Corporation, Kadoma-shi, JP;
Abstract
A zoom lens system comprising a positive first lens unit, a positive second lens unit, and at least two subsequent lens units, wherein the first lens unit moves along an optical axis at the time of zooming, an interval between the second lens unit and one of the at least two subsequent lens units varies at the time of zooming or focusing, the first lens unit is composed of at least three lens elements, each of the first lens unit and the second lens unit includes at least one negative lens element, and the conditions: 0.008<(1/vd)−(1/vd)<0.028 and 0.1<|m|/(f−f)<0.4 (vdand vd: minimum value and maximum value among Abbe numbers to the d-line of each lens element constituting the first lens unit, m: maximum value among the amounts of movement of each subsequent lens unit at the time of zooming, fand f: focal lengths of the entire system at a telephoto limit and at a wide-angle limit) are satisfied; an interchangeable lens apparatus; and a camera system are provided.