Light pipe and illuminating device having the same
A light pipe and an illuminating device having the light pipe are provided. The light pipe includes an optical film including a plurality of prisms and being rolled to have a cavity extending along a longitudinal direction of the prisms; and a supporter surrounding the optical film having the cavity, wherein a side surface of one of the prisms has the maximum surface roughness of about 600 nm to about 1.5 □. Accordingly, it is possible to emit a light toward a distant area through the diffraction of light and thus to provide uniform luminance.
1. A light pipe, comprising:
an optical film including a plurality of prisms, the optical film rolled to form a cavity extending along a longitudinal direction of the plurality of prisms; and
a supporter surrounding the rolled optical film having the cavity,
wherein a side surface of one of the plurality of prisms has a predetermined surface roughness, and
wherein the supporter includes a plurality of protrusions and/or indentations on a surface of the supporter which are formed as one integral body with the supporter.
2. The light pipe of claim 1 , wherein the predetermined surface roughness is a maximum surface roughness, and
wherein the maximum surface roughness is about 600 nm to about 1.5 μm.
3. The light pipe of claim 1 , wherein the predetermined surface roughness is a root mean square (RMS) surface roughness, and
wherein the RMS surface roughness is about 33 nm to about 200 nm.
4. The light pipe of claim 1 , wherein the side surface includes an approximate sinusoid shape having a wavelength (λ), and
wherein a length (L) of the side surface is about 0.5λ to about 2.0λ.
5. The light pipe of claim 1 , wherein apexes of the plurality of prisms face the supporter.
6. The light pipe of claim 1 , wherein apexes of the plurality of prisms face the cavity.
7. The light pipe of claim 1 , wherein the supporter includes a plurality of protrusions and indentations on a surface of the supporter, and
wherein the protrusions and the indentations are formed as one integral body with the supporter.
8. The light pipe of claim 1 , further comprising:
a diffusion layer including a light-transmitting material and a plurality of diffusion particles and disposed on at least one of an inner surface and an outer surface of the supporter.
9. The light pipe of claim 1 , further comprising:
at least one of a reflector and an extractor formed on the supporter.
10. An illuminating device, comprising:
a light source configured to emit a light; and
a light pipe configured to transmit and distribute the light emitted from the light source,
wherein the light pipe comprises,
an optical film including a plurality of prisms, the optical film rolled to have a cavity extending along a longitudinal direction of the plurality of prisms; and
a supporter surrounding the optical film having the cavity,
wherein a side surface of one of the plurality of prisms has a predetermined surface roughness, and
wherein the supporter includes a plurality of protrusions and/or indentations on a surface of the supporter which are formed as one integral body with the supporter.
11. The illuminating device of claim 10 , wherein the predetermined surface roughness is a maximum roughness, and
wherein the maximum surface roughness is about 600 nm to about 1.5 μm.
12. The illuminating device of claim 10 , wherein the predetermined surface roughness is a root mean square (RMS) surface roughness, and
wherein the RMS surface roughness is about 33 nm to about 200 nm.
13. The illuminating device of claim 10 , wherein the side surface includes an approximate sinusoid shape having a wavelength (λ), and
wherein a length (L) of the side surface is approximately 0.5λ to 2.0λ.
14. The illuminating device of claim 10 , wherein apexes of the plurality of prisms face the supporter.
15. The illuminating device of claim 10 , wherein apexes of the plurality of prisms face the cavity.
16. The illuminating device of claim 10 , wherein the supporter includes a plurality of protrusions and indentations on a surface of the supporter, and
wherein the protrusions and the indentations are formed as one integral body with the supporter.
17. The illuminating device of claim 10 , further comprising:
a diffusion layer including a light-transmitting material and a plurality of diffusion particles and disposed on at least one of an inner surface and an outer surface of the supporter.
18. The illuminating device of claim 10 , further comprising:
at least one of a reflector and an extractor formed on the supporter.