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:
Nov. 05, 2019
Filed:
Sep. 06, 2016
Nikon Corporation, Minato-ku, Tokyo, JP;
Tomoki Ito, Kawasaki, JP;
Hiroshi Yamamoto, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A zoom optical system includes, disposed in order from an object, a first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, and a third lens group (G) having positive refractive power, wherein at least a part of the second lens group (G) or at least a part of the third lens group (G) is configured to be movable, as a vibration-proofing lens group for correcting an image blur, so as to have a movement component in a direction perpendicular to an optical axis, and the following conditional expression is satisfied:4.40<1/(−2)<8.00where f1 denotes a focal length of the first lens group (G), and f2 denotes a focal length of the second lens group (G).