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:
Sep. 22, 2026
Filed:
Nov. 17, 2023
Seiko Epson Corporation, Tokyo, JP;
Kengo Kano, Matsumoto, JP;
Koya Shiratori, Matsumoto, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
A wavelength converter includes a wavelength conversion layer including a first recess on a first surface thereof and configured to convert blue excitation light into yellow fluorescent light, a first matching layer provided on the light incident surface of the wavelength conversion layer, and a first flat layer provided on a second surface on the opposite side of a surface of the first matching layer facing the wavelength conversion layer, the first flat layer entering the first recess of the light incident surface. A light refractive index of the first matching layer is an intermediate light refractive index between a light refractive index of the wavelength conversion layer and a light refractive index of the first flat layer.