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:
Jun. 22, 2021
Filed:
Jan. 03, 2017
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventors:
Katsuji Arakawa, Chino, JP;
Susumu Shinto, Shiojiri, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/14 (2015.01); G02B 5/28 (2006.01); G02B 26/00 (2006.01);
U.S. Cl.
CPC ...
G02B 26/001 (2013.01); G02B 1/14 (2015.01); G02B 5/288 (2013.01);
Abstract
A wavelength variable interference filter includes a fixed substrate, a movable substrate that faces the first substrate, a fixed reflective film that is disposed between the fixed substrate and the movable substrate, and a movable reflective film that is disposed between the fixed reflective film and the movable substrate, in which the fixed substrate transmits light, the fixed reflective film includes silver, and a concentration of a hydroxyl group that the fixed substrate includes is 500 ppm or less or 1000 ppm or more.