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. 07, 2017
Filed:
May. 17, 2012
Applicants:
Masayuki Uchiyama, Saitama, JP;
Michio Yanagi, Saitama, JP;
Inventors:
Masayuki Uchiyama, Saitama, JP;
Michio Yanagi, Saitama, JP;
Assignee:
Canon Denshi Kabushiki Kaisha, Chichibu-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/10 (2015.01); G02B 5/22 (2006.01); G02B 1/115 (2015.01); G02B 5/20 (2006.01); G02B 1/118 (2015.01); G02B 3/00 (2006.01);
U.S. Cl.
CPC ...
G02B 5/22 (2013.01); G02B 1/115 (2013.01); G02B 1/118 (2013.01); G02B 5/205 (2013.01); G02B 3/0087 (2013.01);
Abstract
There is provided an optical filter of the type having absorption and with low reflection, which includes a light-transmitting substrate; and a light-absorbing gradient refractive index thin film provided on the substrate and whose refractive index changes so as to be close to the refractive index of the substrate toward the substrate side in a film thickness direction. There is also provided an optical apparatus using the optical filter.