Invention Grant
- Patent Title: Wavelength conversion element, light source device, projector, and method of manufacturing wavelength conversion element
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Application No.: US16821236Application Date: 2020-03-17
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Publication No.: US11572502B2Publication Date: 2023-02-07
- Inventor: Toshiaki Hashizume
- Applicant: SEIKO EPSON CORPORATION
- Applicant Address: JP Tokyo
- Assignee: SEIKO EPSON CORPORATION
- Current Assignee: SEIKO EPSON CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Dority & Manning, P.A.
- Priority: JPJP2019-050089 20190318
- Main IPC: C09K11/02
- IPC: C09K11/02 ; G03B21/20 ; C09K11/08

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
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