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:
Mar. 02, 2021
Filed:
Feb. 14, 2018
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Hiroki Ebe, Saitama, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 27/01 (2006.01); G02B 3/08 (2006.01); G02B 25/00 (2006.01); G02B 5/18 (2006.01); G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
G02B 5/188 (2013.01); G02B 3/08 (2013.01); G02B 25/001 (2013.01); G02B 27/0101 (2013.01); G02B 27/0172 (2013.01); G02B 2027/014 (2013.01); G02F 1/133526 (2013.01);
Abstract
Provided is an observation optical system used for observing an image displayed on an image display surface. The observation optical system includes, in order from an observation surface side to the image display surface side, a first lens having a positive refractive power, and a second lens having a positive refractive power. The first lens is a Fresnel lens, and a focal length f1 of the first lens and a focal length f2 of the second lens are each appropriately set.