| 摘要 |
PROBLEM TO BE SOLVED: To provide a solid state lighting device which is small and lightweight with low heat generation and enhanced reliability.SOLUTION: A solid state lighting device includes a light source part, a light guide part, and a light-emitting part. The light source part has a semiconductor laser, and emits a plurality of laser beams at a wavelength range of a bluish purple color to a blue color. The light guide part has a plurality of waveguide paths for respectively guiding the plurality of laser beams. The light-emitting part has a heat conduction part having a first surface, a wavelength conversion layer arranged on a central part of the first surface, and an optical part having an upper surface, side surfaces, and a lower surface and making at least a part of the lower surface in contact with the first surface. One end each of the plurality of waveguide paths is arranged on the outside of a central part viewed from an upper part, and the plurality of laser beams respectively being incident to the optical part through one end irradiate the wavelength conversion layer. Wavelength-converted light emitted from the wavelength conversion layer absorbing the plurality of laser beams and scattered light generated by converting the plurality of laser beams in the light-emitting part are emitted from an upper surface of the optical part. |
