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:
Aug. 13, 2019
Filed:
Mar. 13, 2018
Seiko Epson Corporation, Tokyo, JP;
Ryuta Koizumi, Shiojiri, JP;
Toshiaki Hashizume, Okaya, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
A light source device includes a first light source configured to emit excitation light having a first wavelength band, a wavelength conversion member having a plurality of surfaces and configured to convert the excitation light made incident from the first light source into converted light having a second wavelength band different from the first wavelength band, and a first light transmissive member provided between the first light source and the wavelength conversion member and configured to transmit the excitation light. The wavelength conversion member includes a first surface on which the excitation light from the first light source is made incident. The first light transmissive member includes, on a surface opposed to the first surface of the wavelength conversion member, a first reflection layer that transmits the excitation light and reflects the converted light. A gap is provided between the first surface and the first reflection layer.