US 11,841,600 B2
Wavelength conversion element, light source device, projector, and method of manufacturing wavelength conversion element
Wataru Yasumatsu, Azumino (JP); and Soma Toda, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 11, 2021, as Appl. No. 17/198,830.
Claims priority of application No. 2020-043303 (JP), filed on Mar. 12, 2020.
Prior Publication US 2021/0286245 A1, Sep. 16, 2021
Int. Cl. G03B 21/20 (2006.01); G03B 33/12 (2006.01); B32B 3/12 (2006.01); B32B 9/00 (2006.01); B32B 9/04 (2006.01); B32B 15/20 (2006.01); B32B 7/12 (2006.01); B32B 37/12 (2006.01)
CPC G03B 21/204 (2013.01) [B32B 7/12 (2013.01); B32B 9/005 (2013.01); B32B 9/041 (2013.01); B32B 15/20 (2013.01); B32B 37/12 (2013.01); G03B 33/12 (2013.01); B32B 2457/00 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A wavelength conversion element comprising:
a wavelength conversion layer configured to convert light in a first wavelength band into light in a second wavelength band different from the first wavelength band;
a first substrate;
a second substrate;
a first intermediate layer provided between the wavelength conversion layer and the first substrate; and
a second intermediate layer provided between the second substrate and any one of the wavelength conversion layer and the first substrate, wherein
a linear expansion coefficient of the first substrate is smaller than a linear expansion coefficient of the wavelength conversion layer,
the linear expansion coefficient of the wavelength conversion layer is smaller than a linear expansion coefficient of the second substrate,
the linear expansion coefficient of the first substrate is smaller than the linear expansion coefficient of the second substrate,
a thermal conductivity of the first substrate is larger than a thermal conductivity of the wavelength conversion layer,
a thermal conductivity of the second substrate is larger than the thermal conductivity of the wavelength conversion layer,
a thickness of the first intermediate layer is smaller than a thickness of the wavelength conversion layer,
the thickness of the first intermediate layer is smaller than a thickness of the first substrate, and
the thickness of the first intermediate layer is smaller than a thickness of the second intermediate layer.