US 12,282,199 B2
Light emitting device, manufacturing method therefor, and waveguide structure
Takehiro Asahi, Osaka (JP); Naoya Ryoki, Osaka (JP); Yukio Nishikawa, Osaka (JP); and Yoshio Okayama, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jun. 21, 2022, as Appl. No. 17/807,889.
Claims priority of application No. 2021-114488 (JP), filed on Jul. 9, 2021.
Prior Publication US 2023/0021122 A1, Jan. 19, 2023
Int. Cl. F21V 8/00 (2006.01); G02B 6/32 (2006.01); G02B 6/42 (2006.01); G02F 1/377 (2006.01)
CPC G02B 6/4207 (2013.01) [G02B 6/0088 (2013.01); G02B 6/009 (2013.01); G02B 6/0091 (2013.01); G02F 1/377 (2013.01); G02B 6/327 (2013.01); G02B 6/4203 (2013.01); G02B 6/4206 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a light source configured to emit light having a directionality; and
a waveguide structure including:
an optical waveguide that has an incident end surface and an emission end surface, the waveguide being configured to convert a wavelength of the light incident from the incident end surface and emit the light from the emission end surface, and
an exterior part that is optically transparent and covers the entire circumference of the optical waveguide in a length direction, the incident end surface and the emission end surface being exposed from the exterior part,
a converging optical system that is disposed on the optical axis of the light and configured to converge the light on the incident end surface, and
a base having a flat disposition surface on which the light source, the converging optical system, and the waveguide structure are disposed,
wherein
the optical waveguide is elongated in the length direction,
the exterior part is made of a material having a smaller refractive index than the optical waveguide,
the length direction of the optical waveguide is inclined at a predetermined angle with respect to an optical axis of the light in a predetermined plane including the length direction of the optical waveguide and the optical axis of the light,
the predetermined angle is set to allow the light to propagate in the optical waveguide with total internal reflection at a boundary surface between the optical waveguide and the exterior part,
a flat mounting member made of a material having high thermal conductivity is disposed on the flat disposition surface of the base,
the waveguide structure having a flat bottom surface is disposed on the flat mounting member,
the flat disposition surface of the base and the flat bottom surface of the waveguide structure face each other via the flat mounting member, and
heat of the waveguide structure is transmitted to the base via the flat mounting member and dissipated.