Light-emitting device having scattering reflector with preset square average inclination
View Patent ↗A light emitting device 1 includes a light emitting diode, a phosphor layer containing phosphors that emit a visible light by being excited by a light emitted from the light emitting diode, and a reflector disposed to surround the light emitting diode. A portion of 50% or more in an area ratio of a reflecting surface of the reflector is formed as a scattering surface with a mean square inclination (Δq) (0.1 mm) in a range of not less than 0.003 nor more than 0.03.
1. A light emitting device, comprising: a light emitting diode; a phosphor layer containing phosphors that emit a visible light by being excited by a light emitted from the light emitting diode; and a reflector being disposed to surround the light emitting diode and having a reflecting surface, wherein at least 50% in an area ratio of the reflecting surface of the reflector is formed as a scattering surface with a mean square inclination (Δq) in a range of not less than 0.003 nor more than 0.03.
2. The light emitting device according to claim 1 , wherein at least 80% in the area ratio of the reflecting surface is formed as the scattering surface.
3. The light emitting device according to claim 1 , wherein the mean square inclination (Δq) in the scattering surface is in a range of not less than 0.008 nor more than 0.02.
4. The light emitting device according to claim 1 ,
wherein an inclination angle of the reflecting surface of the reflector is in a range of 0 to 40°.
5. The light emitting device according to claim 1 ,
wherein a shortest distance between the light emitting diode and the reflecting surface of the reflector is 0.2 mm or less.
6. The light emitting device according to claim 1 ,
wherein the light emitting diode has an emission peak wavelength of 420 nm or less.
7. The light emitting device according to claim 1 ,
wherein the phosphor layer emits a white light.
8. The light emitting device according to claim 1 ,
wherein the light emitting device is a package-shaped light emitting device having a surface-mount structure or a side-view structure.
9. The light emitting device according to claim 8 ,
wherein a length in a longitudinal direction of the package-shaped light emitting device is not less than 2 mm nor more than 3 mm.
10. A backlight, comprising the light emitting device according to claim 1 .
11. A liquid crystal display device, comprising the backlight according to claim 10 .
12. An illumination device, comprising the light emitting device according to claim 1 .