US 11,920,752 B2
Light source device, headlight, display apparatus, and illumination apparatus
Hisayoshi Motobayashi, Tokyo (JP); Satoshi Wada, Aichi (JP); Kento Hayashi, Ehime (JP); and Yuhki Kawamura, Aichi (JP)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Appl. No. 17/757,631
Filed by SONY GROUP CORPORATION, Tokyo (JP)
PCT Filed Dec. 16, 2020, PCT No. PCT/JP2020/046904
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/131946, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-234351 (JP), filed on Dec. 25, 2019.
Prior Publication US 2023/0014812 A1, Jan. 19, 2023
Int. Cl. F21S 41/176 (2018.01); F21S 41/16 (2018.01); F21S 41/32 (2018.01); G02B 5/26 (2006.01)
CPC F21S 41/176 (2018.01) [F21S 41/16 (2018.01); F21S 41/32 (2018.01); G02B 5/26 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A light source device, comprising:
a substrate;
a phosphor in contact with the substrate;
a light emitting element configured to emit excitation light to excite the phosphor; and
a wavelength-selective reflecting member configured to:
partially reflect the excitation light to be guided to the phosphor, and
transmit the excitation light reflected by the phosphor and fluorescence emitted from the phosphor based on the excitation by incidence of the excitation light on the phosphor.