US 11,796,156 B2
Fluorescent plate, wavelength conversion member, and light source device
Shohei Takaku, Nagoya (JP); Hiroki Yamauchi, Nagoya (JP); Shinji Ban, Nagoya (JP); and Hiroki Takeuchi, Nagoya (JP)
Assigned to NITERRA CO., LTD., Nagoya (JP)
Appl. No. 18/864
Filed by NGK SPARK PLUG CO., LTD., Nagoya (JP)
PCT Filed Jun. 3, 2021, PCT No. PCT/JP2021/021144
§ 371(c)(1), (2) Date Dec. 6, 2022,
PCT Pub. No. WO2021/251251, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 2020-099394 (JP), filed on Jun. 8, 2020.
Prior Publication US 2023/0213172 A1, Jul. 6, 2023
Int. Cl. F21V 9/40 (2018.01); F21V 29/502 (2015.01); F21V 29/70 (2015.01); F21V 7/26 (2018.01)
CPC F21V 9/40 (2018.02) [F21V 7/26 (2018.02); F21V 29/502 (2015.01); F21V 29/70 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A fluorescent plate comprising:
a fluorescent phase which emits fluorescence by excitation light,
a light-transmitting phase which allows passage of the excitation light, and
a plurality of voids surrounded by the fluorescent phase and the light-transmitting phase,
wherein, in a cross section of the fluorescent plate including cross sections of the voids, an average ratio of a portion of the circumference of a void, which portion is in contact with the fluorescent phase to the entire circumference of the void, is higher than
a ratio of the area of the fluorescent phase present in the fluorescent plate to the total area of the fluorescent phase and the light-transmitting phase present in the fluorescent plate.