本論文中，我們提出一個以LED當作光源的腔體式導光條之二階光學設計，並將其應用在表面均勻發光又具有立體感之線形車後燈，其中包含分析不同導光條結構對於光源直接漏光的影響，以及擴散片穿透率對均勻度之關係。此外，我們亦將此光學設計應用在實際的例子中，設計出一款自行車之車後燈，並且符合德國K-mark法規之規範。

關鍵字 : LEDs，二階光學設計，車後燈，導光條，擴散片。

In this thesis, we provide a secondary optical design of cavity light guide with LEDs, and apply to a line-structured vehicle tail lamp which is uniform on the light-emitting surface and stereoscopic. The analysis includes the light leakage issue with different light guide structures and the unifomity depending on the transmittance of the diffuser. Finally, this optical design is utilized in the tail lamp of bicycle to meet the K-mark regulation of Germany.

Keywords : LEDs, secondary optical design, tail lamp, light guide, diffuser

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