US 12,339,573 B2
Light source device and projector
Takuo Yoneyama, Azumino (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Dec. 12, 2022, as Appl. No. 18/079,521.
Claims priority of application No. 2021-201470 (JP), filed on Dec. 13, 2021.
Prior Publication US 2023/0185175 A1, Jun. 15, 2023
Int. Cl. G03B 21/20 (2006.01); H04N 9/31 (2006.01)
CPC G03B 21/204 (2013.01) [G03B 21/2013 (2013.01); G03B 21/2066 (2013.01); H04N 9/3161 (2013.01); H04N 9/3164 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A light source device comprising:
a first light source configured to emit first light having a first wavelength;
a second light source configured to emit second light;
a wavelength conversion element having a first surface which the second light emitted from the second light source enters and a second surface located at an opposite side to the first surface, the wavelength conversion element being configured to convert the second light into third light having a second wavelength different from the first wavelength;
an optical member configured to combine the first light and the third light with each other to emit combined light; and
a reflecting member configured to reflect, toward the optical member, the first light which is a part of the first light emitted from the first light source and which is emitted from the optical member, wherein
the first light reflected by the reflecting member enters the second surface of the wavelength conversion element via the optical member, and is converted into the third light, and
the optical member is configured to transmit a part of the first light entering the optical member, and reflect at least a part of the third light entering the optical member to generate the combined light, and reflect another part of the first light entering the optical member to the reflecting member.