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. 09, 2021
Filed:
Dec. 27, 2019
Seiko Epson Corporation, Tokyo, JP;
Toshiaki Hashizume, Okaya, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
A light source device includes a light source configured to emit excitation light, a wavelength conversion section configured to perform wavelength conversion on the excitation light to generate fluorescence having a wavelength longer than a wavelength of the excitation light, a substrate opposed to the wavelength conversion section, and an air gap disposed between the wavelength conversion section and the substrate, wherein the wavelength conversion section has a first surface opposed to the substrate, the substrate has a second surface opposed to the first surface, a thickness dimension of the air gap as a dimension in a direction from the first surface toward the second surface is defined by a sum of a roughness of the first surface and a roughness of the second surface, and the thickness dimension of the air gap is no smaller than a wavelength of the fluorescence.