本論文研究彎曲式導光元件應用於LED 車前近光燈模組之設計，以LED 向上照射式彎曲導光柱為主要整光元件，光線經導光柱在出光口形成非均勻對稱分布，並透過短焦投影透鏡組，投射出符合聯合國歐洲經濟委員會的ECE-R112 法規之光型，且符合車廠路照標準之水平寬度。
本論文利用SOLIDWORKS 疊層拉伸形成導光柱，導入ZEMAX 光學模擬軟體中進行光線追跡分析並且優化，其功能將橢圓反射面和擋板的功能合併其中。第一步先證明方形彎曲式導光元件有能力提供非均勻光型，第二步將導光柱出光口放置在投影透鏡的焦點上，並投射到25 公尺遠處的屏幕上面，並針對偵測點量測光強度和光型修飾。在實驗的過程中，使用三片平凸透鏡縮短有效焦距，增加投影透鏡的放大率，卻導致25 公尺處中央熱點光強度下降，在中央導光柱嘗試使用7 種導光柱設計方式。最後採用中央放置窄出光面自由曲面導光柱和兩側放置次要的導光柱，以達成車廠路照標準，我們稱此為組合式導光柱近光燈系統。
在本研究中投影透鏡使用三片厚度約為12mm 的透鏡，比起常用厚度20mm 雙透鏡組，12mm 薄透鏡製程時間縮短更具優勢，且投影透鏡組工作總長度減少16mm。整個系統結合在一個投影透鏡組之下，降低近光燈系統組裝難度。組合式導光柱近光燈系統光學效率38%左右與過去橢圓反射面近光燈模組效率一致。

In this paper, we study the design of the bending light guide element applied to LED
low beam module. The LED upward irradiation bending light guide is the main optical
components. The light is asymmetrically distributed through the light guide at the light guide
outlet and through the short-throw projection lens set, the light pattern is projected in
accordance with The ECE-R112 regulation of the United Nations Economic Commission
for Europe. And following the regulation of the automobile factory standard horizontal width.
In this paper, the light guide is formed by the Lofted base of SOLIDWORKS, which is
imported into ZEMAX optical simulation software for ray tracing analysis and optimization.
The function of the light guide combines the functions of the elliptical reflector and baffle.
The first step is to prove that the square bending light guide element is capable of providing
a non-uniform light pattern. The second step is to place the outlet of the light guide on the
focus of the projection lens and project it to the screen 25 meters away, and to measure the
light intensity and light type modification according to the detection point quantity. During
the experiment, three plano-convex lenses were used to shorten the effective focal length
and increase the magnification of the projection lens, but the intensity of the central hot spot
at 25 meters decreased. Try to use 7 light guide design methods in the central light guide.
Finally, the free-form light guide with the narrow outlet is placed in the center and the
secondary light guide is placed on both sides to achieve the road lighting standard of the
automobile factory. We call it ” combined light guide low beam system”.
In this study, three lenses with a thickness of about 12mm were used for the projection
lens. Compared with the common dual-lens group with a thickness of 20mm. the
manufacturing time of the dominant lens was shortened, and the total working length of the
projection lens group is reduced by 16mm. The whole system is combined under a projection
lens group to reduce the difficulty of assembly of the low beam system. The optical
efficiency of the combined light guide low beam system is about 38%, which is consistent
with the efficiency of the elliptical reflector low beam module in the past.

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