以自由曲面透鏡為基礎具高明暗梯度之LED汽車前霧燈設計

車用照明系統中，透鏡的主要用途是將光線匯聚或者發散，絕大部分的透鏡都是球面透鏡，然而對於某些特殊目的，如無橢圓反射及遮光板的設計之下，要單靠透鏡就營造出高梯度的明暗截止線，球面透鏡並不適用。因此我們必須設計特定的透鏡來改變光線方向，而這些透鏡的鏡面往往屬於非球面或自由曲面，以往受限於電腦運算的能力及加工技術的限制，非球面與自由曲面透鏡的設計與製作是非常困難的，但是，隨者電腦運算能力與超精密加工技術的發展，非球面與自由曲面透鏡的設計與製造是可行且值得發展的。本研究提出以自由曲面的設計方法，設計自由曲面的透鏡包覆LED光源，收集LED光源各角度的光線，以達到高利用率的效果，並由實驗設計結果發現，使用一顆雙晶425lm的LED光源即可符合較嚴苛的ECE R19 F3法規，並且可以讓光形均勻分布，且在無遮光板遮蔽的情況下營造出高梯度的明暗截止線。本研究利用自由曲面的推導方法，並使用MATLAB計算出一自由曲面透鏡，再以光學模擬軟體執行模擬，並實作驗證，取消耗能較大的反射面及遮光板設計單純以透鏡包覆LED光源的設計，不僅能夠提高光源的利用率，減少LED使用數量更能縮小光學元件的體積，並且免除反射面加工的成本及製程。

關鍵字

LED ；前霧燈；明暗截止線；自由曲面；透鏡

並列摘要

Vehicle lighting systems, the lens's primary purpose is to light converge or diverge, the vast majority of lenses are spherical lenses, but for some special purpose, such as non-elliptical reflector and the design of the shading plate under the lens to be alone to create a high gradient cutoff line, a spherical lens does not apply. Therefore, we need to design a specific lens to change the direction of light, and these lenses are aspheric mirror often or free-form surfaces, previously limited computing capacity and processing technical limitations, aspheric and free form lens design and production is very difficult, however, with the computing power and by ultra-precision processing technology development, aspheric and free form lens design and manufacturing is feasible and worth developing. This research in a free surface design method of the lens surface coated free LED light source, LED light collection angle of light of each in order to achieve high utilization of the results, was found by the experimental design, the use a single twin 425lm LED light source can meet the more stringent ECE R19 F3 regulations, and allows a uniform distribution of light shape, and in no case visor shield to create a high gradient cutoff line. In this study, the derivation of free-form surfaces, and using MATLAB calculates a free form lens, optical simulation software and then to run the simulation, and implementation verification, cancellation larger reflective surface energy and shading plate coated with LED lens designed simply to light design, not only can improve the utilization of light, reducing the number of LED used to better reduce the size of the optical element, and the reflecting surface eliminating the cost of processing and manufacturing processes.

並列關鍵字

LED ； front fog lights ； cut-off line ； free-form surface lens

參考文獻

[21] 劉源昌，"聚焦非球面厚透鏡的光學設計"，光學工程，第79期

[9] 楊閔舜，2011，"自由曲面法應用於LED前霧燈設計"，國立虎尾科技

[20] Jin Jia Chen, Chin Tang Lin, "Freeform surface design

[1] L. Schwenkschuster, “Automotive LED-Applications Using

[2] LED Module for Headlamp, SAE Tech Paper Series 2003-01-

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以自由曲面透鏡為基礎具高明暗梯度之LED汽車前霧燈設計

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