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:
Feb. 07, 2023
Filed:
Mar. 17, 2020
Seiko Epson Corporation, Tokyo, JP;
Toshiaki Hashizume, Okaya, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A wavelength conversion element includes a phosphor layer having phosphor particles and a binder, and a holding member including alumina, configured to hold the layer. The binder includes glass and is configured to bind a part the adjacent particles. The holding member has a pore, defining an apparent porosity thereof as X, bending strength A of the holding member fulfills A=−7.11X+316.52, an elastic modulus B of the holding member fulfills B=−6.26X+288.43, and defining an elastic modulus of the glass as C, 1/B+1/C=D, and a product of a difference between a linear expansion coefficient of the holding member and a linear expansion coefficient of the glass and a transition point of the glass as Y, Y<(A)(D)(0.001) when the linear expansion coefficient of the glass is smaller than the linear expansion coefficient of the holding member in a temperature range from the transition point of the glass to a room temperature.