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:
Feb. 16, 2021
Filed:
Nov. 06, 2018
Applicant:
Nikon Corporation, Tokyo, JP;
Inventors:
Assignee:
NIKON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/18 (2006.01); G02B 27/00 (2006.01); G02B 3/08 (2006.01); G02B 27/01 (2006.01); G02B 27/42 (2006.01); G02B 25/00 (2006.01); G02B 30/36 (2020.01);
U.S. Cl.
CPC ...
G02B 27/0037 (2013.01); G02B 3/08 (2013.01); G02B 27/0081 (2013.01); G02B 27/0172 (2013.01); G02B 27/4211 (2013.01); G02B 27/4216 (2013.01); G02B 5/1814 (2013.01); G02B 25/00 (2013.01); G02B 30/36 (2020.01); G02B 2027/011 (2013.01); G02B 2027/0116 (2013.01);
Abstract
An ocular optical system (EL) comprises, in order from an eye point (EP), a first lens group (G) having a positive refractive power and a second lens group (G) having a positive refractive power. The second lens group (G) includes a cemented lens having two optical members cemented together. A cemented surface of the cemented lens is a diffraction optical surface configuring a diffraction grating. A lens surface on one side in a lens constituting the first lens group (G) is a first Fresnel surface (FSa), and a lens surface on one side in the cemented lens of the second lens group (G) is a second Fresnel surface (FSb).