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. 07, 2018
Filed:
Apr. 01, 2015
Applicant:
Nikon Corporation, Chiyoda-ku, Tokyo, JP;
Inventors:
Taku Matsuo, Kawasaki, JP;
Motohisa Mouri, Kawasaki, JP;
Yukio Kubota, Tsurugashima, JP;
Takuya Sato, Tokyo, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 25/00 (2006.01); G02B 15/14 (2006.01); G02B 3/02 (2006.01); G02B 17/00 (2006.01); G02B 9/12 (2006.01); G02B 9/00 (2006.01); G02B 13/18 (2006.01);
U.S. Cl.
CPC ...
G02B 25/001 (2013.01); G02B 13/18 (2013.01);
Abstract
Provided is an eyepiece optical system including at least three lenses disposed in order from an observation object (Ob) along an optical axis. A final lens disposed closest to an eye point (EP) (corresponds to the third lens (L) in FIG.) is fixed when adjusting the diopter, and the following conditional expressions (1) and (2) are satisfied:2.2<||<6.0  (1)0.5<|2/|<5.0  (2)