无遮光板高亮度LED汽车头灯之设计分析.doc

無遮光板高亮度LED汽車頭燈之設計分析 Design and Analysis of High Brightness LED Automotive Headlamp without Using Shield 研究生：廖峻偉 Liao , Chun-Wei 指導教授：陳永昌 Chen , Young-Chang 【摘要】 本論文採用光學模擬軟體進行投射式LED汽車頭燈之開發研究，以縮短車燈設計流程，主要設計概念包含繞射光學元件 DOE 之應用與非對稱LED底座設計，其中LED封裝表面採用繞射光學元件，可利用其高聚焦特性，以提升車燈系統照度值；而放置LED之底座採用非對稱設計，則可省略遮光板元件，除了簡化設計外並可減少能量損失。本研究首先進行單顆LED車燈各設計元件之最佳化參數分析，然後完成多顆LED投射式車燈獨立模組之設計。由於車燈模組數量增多，將增加車燈結構的複雜度與組裝上的困難度，為了簡化整體車燈排列模組設計，因此進一步改良車燈模組，採用單一反射罩、單一透鏡與單一非對稱底座之設計。最後製作單顆LED投射式車燈的實體模型，並與模擬結果比較，藉以驗證模擬數據的準確性，完成LED投射式車燈的設計流程。本研究所開發之投射式LED汽車頭燈，提供簡化設計結構、較高效率與減少LED使用顆數之優點。 關鍵字：LED投射式車燈、繞射光學元件、遮光板、光學模擬 【Abstract】 In this thesis, a projection LED automotive headlamp system has been developed by using optical simulation software. Two critical design concepts are proposed, one is the application of diffraction optical elements on the encapsulation surface of LED, and the other is the focusing performance and improves the illumination. The latter, a redesign of asymmetric LED base, can ignore the need of optical shield, and simplify the design and reduce energy loss. In this simulation, the optimization of the design for single LED is first investigated. The arrangement of optical devices in the individual module of single LED is then established. Furthermore, single reflector, lens and LED base are employed to overcome the complexity of assembly for the integrated module array. Finally, a real model of single LED module is fabricated to verify the simulation results. The projection LED automotive headlamp system designed in this study provides a simplified structure, higher efficiency and less LED requirement. Keywords：LED projection headlamp, diffraction optical elements, optical shield, optical simulation