Wavelength converter, light source device, and projector
AssigneeSeiko Epson Corporation
InventorsKengo Kano, Koya Shiratori
Life of this patent
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Abstract
A wavelength converter includes a wavelength conversion layer including a first recess on a first surface thereof and configured to convert blue excitation light into yellow fluorescent light, a first matching layer provided on the light incident surface of the wavelength conversion layer, and a first flat layer provided on a second surface on the opposite side of a surface of the first matching layer facing the wavelength conversion layer, the first flat layer entering the first recess of the light incident surface. A light refractive index of the first matching layer is an intermediate light refractive index between a light refractive index of the wavelength conversion layer and a light refractive index of the first flat layer.
Claims10
A wavelength converter comprising:
- a wavelength conversion layer including a first recess on a first surface thereof and configured to convert first light having a first wavelength into second light having a second wavelength different from the first wavelength;
- a first layer provided on the first surface of the wavelength conversion layer;
- and
- a first flat layer provided on a second surface on an opposite side of a surface of the first layer facing the wavelength conversion layer, the first flat layer entering the first recess of the first surface, wherein
- a light refractive index of the first layer is an intermediate light refractive index between a light refractive index of the wavelength conversion layer and a light refractive index of the first flat layer, and
- √{square root over (n1·n2)}−0.1<n<√{square root over (n1·n2)}+0.1, n is the light refractive index of the first layer, n1 is the light refractive index of the wavelength conversion layer, and n2 is the light refractive index of the first flat layer.
A wavelength converter comprising:
- a wavelength conversion layer including a first recess on a first surface thereof and configured to convert first light having a first wavelength into second light having a second wavelength different from the first wavelength;
- a first layer provided on the first surface of the wavelength conversion layer;
- a first flat layer provided on a second surface on an opposite side of a surface of the first layer facing the wavelength conversion layer, the first flat layer entering the first recess of the first surface;
- and
- a reflection layer provided on a surface on an opposite side of a surface of the first flat layer facing the first layer and configured to transmit the first light and reflect the second light emitted from the wavelength conversion layer, wherein
- a light refractive index of the first layer is an intermediate light refractive index between a light refractive index of the wavelength conversion layer and a light refractive index of the first flat layer,
- an average reflectance of the reflection layer for the first light is 4% or lower, and
- a difference between a maximum reflectance and a minimum reflectance of the reflection layer for the first light is 2% or smaller.
Dependencies are inferred from the claim text.