Patent ID: 9441155
Filing Date: 2016-09-13
CPC Classification: C03C,C09K,F21S,F21V,F21Y,G02B

Claim Text:
1. A light-emitting device comprising: an excitation light source for emitting excitation light; a wavelength converting member containing a fluorescent substance that emits light in response to the excitation light emitted by the excitation light source, the wavelength converting member having an incident surface on which the excitation light is incident; and a thermally conductive member that is thermally connected to the wavelength converting member so as to receive heat from the wavelength converting member, a difference between a thermal expansion coefficient of the wavelength converting member containing the fluorescent substance and a thermal expansion coefficient of the thermally conductive member being 0.1×10 the thermally conductive member being transparent and of a plate-like shape, the plate like shape being with or without a bend and with or without a curved portion, the thermally conductive member being between the excitation light source and the incident surface of the wavelength converting member.