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. 18, 2025
Filed:
Aug. 31, 2023
Applicant:
Nikon Corporation, Tokyo, JP;
Inventors:
Katsuya Watanabe, Yokohama, JP;
Azuna Nonaka, Yokohama, JP;
Assignee:
NIKON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 21/02 (2006.01); G02B 9/14 (2006.01); G02B 21/33 (2006.01);
U.S. Cl.
CPC ...
G02B 21/02 (2013.01); G02B 9/14 (2013.01); G02B 21/33 (2013.01);
Abstract
An objective lens (OL) comprises, disposed in order from an object: a positive lens (L); a negative meniscus lens (L) cemented to the positive lens (L) and having a concave surface facing the object; and a positive meniscus lens (L) having a concave surface facing the object; wherein the objective lens satisfies following conditional expressions 2.03≤n1m≤2.30 and 20≤ν1m, where, n1m: a refractive index of the negative meniscus lens (L) with respect to a d-line, and ν1m: an Abbe number of the negative meniscus lens (L).