| 摘要 |
A light guide for performing a light distribution function is provided to perform the light distribution function by injecting air bubbles into an optical pipe or an insertion without using an additional light extractor. An optical pipe(120) includes a smooth outer side and an inner side. The inner side is extended in the same direction along a longitudinal direction. The inner side is formed with a linear structure including lines arranged in parallel to each other. One end of the optical pipe is opened along the longitudinal direction. A light output unit is formed along the open part of the optical pipe at the outside of the optical pipe in order to output the light from the inside of the optical pipe to the outside. A plurality of air bubbles(126) are distributed in the inside of the optical pipe.
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