US 12,393,111 B2
Light source device and projector
Junichi Suzuki, Matsumoto (JP); Hidefumi Sakata, Azumino (JP); Yuichiro Iwama, Azumino (JP); and Shingo Komiyama, Chino (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 18, 2022, as Appl. No. 17/989,774.
Claims priority of application No. 2021-188622 (JP), filed on Nov. 19, 2021.
Prior Publication US 2023/0161237 A1, May 25, 2023
Int. Cl. G03B 21/20 (2006.01)
CPC G03B 21/204 (2013.01) [G03B 21/2013 (2013.01); G03B 21/2066 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A light source device comprising:
a light emitting element which has a light emitting surface, and which is configured to emit first light having a first wavelength band from the light emitting surface;
a wavelength conversion member which includes a phosphor, and which is configured to convert the first light emitted from the light emitting element into second light having a second wavelength band different from the first wavelength band; and
a support member configured to support the wavelength conversion member, wherein
the wavelength conversion member has a first face and a second face which cross a longitudinal direction of the wavelength conversion member, and which are located at respective sides opposite to each other, a third face and a fourth face which cross the first face and the second face, and which are located at respective sides opposite to each other, and a fifth face and a sixth face which cross the first face and the second face, and which cross the third face and the fourth face, and which are located at respective sides opposite to each other, and emits the second light from the first face,
the light emitting surface is disposed so as to be opposed to the third face,
the support member has a support surface opposed to the fourth face, and a first wall surface which is opposed to the fifth face, and which is separated from the fifth face,
the first wall surface has a first portion located at the wavelength conversion member side, and a second portion located at the support surface side,
the first portion extends in a direction perpendicular to the support surface, and
the second portion is tilted so as to get away from the fifth face as proceeding toward the first portion from the support surface, and the second portion reflects at least a part of the first light.