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:
Aug. 12, 2025
Filed:
Aug. 24, 2020
Nikon Corporation, Tokyo, JP;
Hiroshi Yamamoto, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A variable-power optical system (ZL) comprises a first lens group (G) having a negative refractive power and a succeeding lens group (GR), which are disposed on an optical axis in that order from the object side. When varying magnification from wide angle to telephoto, the space between the adjacent lens groups changes. The succeeding lens group (GR) comprises: a first focusing lens group (G) having a positive refractive power; and a second focusing lens group (G) having a positive refractive power. When focusing from infinity to a proximate distance, the first focusing lens group (G) moves toward the object side, and the second focusing lens group (G) moves toward the image side.