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:
Mar. 31, 2020
Filed:
Jan. 29, 2016
Nikon Corporation, Minato-ku, Tokyo, JP;
Atsushi Shibayama, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A variable magnification optical system includes, in order from an object: a first lens group (G) having a negative refractive power; a second lens group (G) having a positive refractive power; a third lens group (G) having a negative refractive power; and a fourth lens group (G) having a positive refractive power. The system performs varying magnification by changing the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the distance between the third lens group and the fourth lens group. The third lens group includes a 32nd lens group (G) configured to be movable so as to have a component in a direction orthogonal to an optical axis in order to correct image blur as a vibration-reduction lens group (VR) and a 31st lens group (G) disposed at an object-side of the 32nd lens group. The 32nd lens group has negative refractive power, and the system satisfies Conditional Expression (1) below.0.200<1/3<0.900  (1)