LED光源均勻發光之車用後霧燈設計

近年來，由於LED(Light Emitting Diode)科技發展迅速，因其具備反應速度快、生命週期長、耗電量低、體積小、指向性高等優點，故被廣泛應用於車輛之行車照明及方向指示、警示燈等功能。大部分的車燈大多採直接光源或透鏡方式設計，而應用光導引方式設計之燈種，則受限於亮度與勻光效果無法同時兼顧，故僅應用於行車燈設計上。　　ECE(歐洲經濟執委會Economic Commission for Europe)規範煞車燈亮度下限為60cd、高位煞車燈(即俗稱第三煞車燈)為25cd、後轉向燈為 50cd，而行車燈則僅為4cd，故以光導引方式要達到行車燈亮度較易，要達到煞車燈以上的亮度是有困難的，除了需使用高功率LED外，還需有良好的設計才能達到規範標準。　　光導引設計旨在將光線平均分配於該燈具發光面積內，以達到均勻面發光之視覺效果，但也往往因此犧牲光能量的應用效率，使其亮度僅能達到行車燈所需亮度，而無法應用於其他功能上。本研究主要在研究如何應用高功率LED作為光源，透過耦合結構收集光線集中應用，再利用幾何光學之內反射原理規劃、切割光路，並以光學模擬軟體進行光形、光強度及視覺效果等模擬，使其既能符合所頒布的後霧燈法規(Regulation No. 38)規範之光強度，在視覺效果上，又能達到人眼可接受之勻光效果，最後再製作成實體模型，進行實體配光驗證。

關鍵字

LED車燈；勻光；光導引；後霧燈

並列摘要

In recent years, the rapid development of LED technology , because it has a fast response, long life cycle , low power consumption , small size, directional advantages, it is widely used in lighting and direction of the vehicle driving instructions , warning lights and other functions . Most of the lights are mostly taken direct light or lens mode design, and design application of light guiding the way light species, is limited by the brightness and uniform light effect can not be taking into account , it only applies to running lights design. 　　ECE (Economic Commission for Europe) specifications brake light brightness limit is 60cd, high brake lights is 25cd, the turn signal is 50cd, and running lights are only 4cd, so the way to the light guide to achieve brightness easier running lights , brake lights to achieve the brightness of the above it is difficult , in addition to the need to use high power LED , the need to achieve a good design specification standards. 　　The light guide is designed to evenly light the lamps emitting area in order to achieve uniform light-emitting surface of the visual effects, but it is often thus sacrificing the efficiency of light energy applied to the luminance only reach the desired brightness running lights , can not be applied to other functions . 　　This study focuses on how the application of high-power LED as the light source, the coupling structure to collect light centralized application through, and then use the geometrical optics reflection principle planning, cutting the optical path, and optical simulation software optical shape, light intensity and visual effects simulation to both comply with regulations promulgated by the rear fog lamp (Regulation No. 38) regulate the light intensity on the visual effects, while maintaining acceptable dodging eye effect, and finally made into a physical model for the physical distribution light verified.

並列關鍵字

LED Light ； Dodging ； Light Guide ； rear fog Lamps

參考文獻

[11]楊敏舜，2012，"自由曲面法運用於LED前霧燈設計"，國立虎尾

[5] David Jenkins; Robert Pagano; Kevin Garcia; Robert Passera; Joseph A. Griffin;Gerhard F. Hirmer，US Pattern NO.US6398988 “THIN LIGHT MANAGING SYSTEM FOR DIRECTING AND

[1]http://commons.wikimedia.org/wiki/File:BMW_E60_M5_2.JPG