US 12,487,514 B2
Light source device and projector
Koichi Akiyama, Azumino (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 24, 2023, as Appl. No. 18/189,257.
Claims priority of application No. 2022-047977 (JP), filed on Mar. 24, 2022.
Prior Publication US 2023/0305374 A1, Sep. 28, 2023
Int. Cl. G03B 21/20 (2006.01)
CPC G03B 21/204 (2013.01) [G03B 21/206 (2013.01); G03B 21/2066 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A light source device comprising:
a substrate having a supporting surface;
a first light source disposed at a supporting surface side of the substrate and configured to emit first light in a first wavelength range;
a first optical member having a first optical layer facing the supporting surface and reflecting the first light emitted from the first light source;
a first wavelength conversion layer having a light incident surface that the first light output from the first light source enters, and configured to convert the first light into second light in a second wavelength range different from the first wavelength range and emit the second light from the light incident surface;
a light emitting portion formed by at least the substrate and the first optical member; and
a second optical member disposed at the light emitting portion and having a second optical layer configured to reflect the first light and transmit the second light, wherein
the first optical layer is inclined with respect to the light incident surface and configured to reflect further the second light,
the first wavelength conversion layer is disposed on one of a surface at the substrate side of the first optical layer and the supporting surface of the substrate, and
the light emitting portion emits the second light.