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:
Oct. 16, 2018
Filed:
Aug. 03, 2017
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventors:
Toshiaki Hashizume, Okaya, JP;
Kunihiko Takagi, Okaya, JP;
Tetsuo Shimizu, Matsumoto, JP;
Osamu Arakawa, Shiojiri, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 21/20 (2006.01); G03B 21/00 (2006.01); G03B 21/16 (2006.01);
U.S. Cl.
CPC ...
G03B 21/204 (2013.01); G03B 21/006 (2013.01); G03B 21/16 (2013.01); G03B 21/2013 (2013.01); G03B 21/2066 (2013.01);
Abstract
A wavelength conversion element includes a base material and a phosphor layer that contains a phosphor emitting fluorescence upon incidence of excitation light and is provided on the base material, in which the phosphor layer includes a first surface on which excitation light (blue light) is incident and a second surface facing the base material, and a plurality of regions with different absorption coefficients of the excitation light between the first surface and the second surface.