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:
Oct. 21, 2025
Filed:
Dec. 02, 2020
Applicant:
Nikon Corporation, Tokyo, JP;
Inventor:
Mami Muratani, Tokyo, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 15/20 (2006.01); G02B 27/00 (2006.01);
U.S. Cl.
CPC ...
G02B 15/1461 (2019.08); G02B 15/20 (2013.01); G02B 27/0025 (2013.01);
Abstract
A variable magnification optical system (ZL) comprises a front group (GA) and a rear group (GB). The rear group (GB) has a first focusing lens group (GF1) and a second focusing lens group (GF2). From focusing on an object at infinity to focusing on a short-distance object, the front group (GA) is fixed with respect to an image surface, and the first focusing lens group (GF1) and the second focusing lens group (GF2) move on different trajectories along an optical axis. The variable magnification system satisfies the following conditional expressions.0.25<β11<2.000.25<β22<2.00