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. 26, 2025
Filed:
Apr. 12, 2021
Applicant:
Nikon Corporation, Tokyo, JP;
Inventors:
Masashi Yamashita, Tokyo, JP;
Akino Kondo, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 15/20 (2006.01); G02B 15/14 (2006.01);
U.S. Cl.
CPC ...
G02B 15/1441 (2019.08); G02B 15/20 (2013.01);
Abstract
This optical system (OL) has a first lens group (G) having positive refractory power, a second lens group (G), a third lens group (G), and a fourth lens group (G) which are aligned in order from an object side along an optical axis, wherein when focused from an infinity object to a short-distance object, the second lens group (G) and the third lens group (G) move in mutually different trajectories along the optical axis, and the second lens group (G) and the third lens group (G) are composed of three or less lenses in total.