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:
Jan. 21, 2020
Filed:
May. 29, 2018
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Toshiaki Hashizume, Okaya, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/20 (2006.01); H01L 33/50 (2010.01); H04N 9/31 (2006.01); H01S 5/06 (2006.01); G02B 27/30 (2006.01); G02B 26/00 (2006.01); H04N 9/04 (2006.01); G03B 21/16 (2006.01);
U.S. Cl.
CPC ...
G03B 21/204 (2013.01); G02B 26/008 (2013.01); G02B 27/30 (2013.01); H01L 33/502 (2013.01); H01S 5/0609 (2013.01); H04N 9/04521 (2018.08); H04N 9/3158 (2013.01); G03B 21/16 (2013.01);
Abstract
A wavelength conversion element includes a wavelength conversion layer containing a plurality of phosphor particles and an inorganic binder that bonds the phosphor particles to each other and a substrate that holds the wavelength conversion layer and contains alumina and air cavities. The substrate has an apparent air cavity ratio that is greater than or equal to 10% and smaller than or equal to 30%. The substrate has a median diameter of particles of the alumina that is greater than or equal to 0.1 μm and smaller than or equal to 1.0 μm.