| 摘要 |
PURPOSE: A liner light source having a light guide with tapered saw tooth structure is provided to achieve the concise efficiency by identifying the used amount of a light emitting diode. CONSTITUTION: A linear light source(1) comprises a light guide(10), a reflection cartridge(18), and a light emitting diode(11b). The light guide comprises an entrance surface(15), a reflecting surface(13), a refraction surface(17), and an exit surface(12). The light emitting diode is arranged on the entrance surface of the light guide.
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