本論文旨在研究導光柱式LED車前近燈模組設計，其光學系統架構以現今投射式車燈為基礎，係由高亮度白光LED、非對稱導光柱以及投射透鏡組成，無須檔板，即可提供ECE R112法規具截止線之非均勻光型。
本論文共提出三種非對稱導光柱的形式，並進行最佳化設計。分別為同軸式導光柱、彎曲式導光柱及組合式導光柱。同軸式導光柱，證明可以提供符合法規的非均勻車前近燈光型，並經優化後可提升非均勻光型之光線集中熱點光強度達2.7倍；彎曲式導光柱，進一步在有限的空間內，增加系統模組光學利用率，並同時提升熱點光強度高達7.3倍；組合式導光柱，藉由五個短小導光柱組成，同時將熱點光強度提升4倍，並提供更寬廣的道路照明需求。由本論文所提出之光學模組可使效率達60%以上，並可使模組尺寸限縮在長60mm、寬52mm、高32mm的範圍內，相當於減少以反射罩為基礎的投射式車前燈80%的體積。

The purpose of this thesis is to focus on the design of the optical module of LED headlight with light-guide. Based on the current projection headlight, our proposed optical system is composed of high-brightness white LED, asymmetric light-guide, and projection lens, without a shield. The light pattern is designed to meet the ECE R112 regulation for the automotive low beam.
In this thesis, we propose three asymmetric light-guide structure and optimize them, including coaxial, curved and combined light-guide. First, coaxial light-guide can provide perfect nonuniform lighting beam pattern in compliance with regulations, and enhance the intensity 2.7 times at hotspot after optimization; second, curved light-guide can promote more optical utilization in limited space, and enhance the intensity up to 7.3 times at hotspot at the same time; third, combined light-guide, which is composed of five short light-guides, can enhance the intensity 2.7 times at hotspot, besides, provide wider road lighting. In general, the optical efficiency of these headlight modules all are more than 60%, and the size can be limited to 60mm in length, 52mm in width and 32mm in height so that indicates that we can reduce the size up to 80% of the existing reflector-based projection headlight.

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