LED汽车前照灯高效抛物反射器的研究.pdf

第31 卷 第6 期 红 外 技 术 Vol.31 No.6 2009 年6 月 Infrared Technology June 2009 〈红外应用〉 LED 汽车前照灯高效抛物反射器的研究 余桂英，金 骥 （中国计量学院计量测试工程学院，浙江杭州 310018 ） 摘要：根据非成像光学和光度学理论，针对 LED 光源的发光特性和汽车造型设计要求，分析了影响 抛物反射器能量利用率的几何参数，导出了抛物反射器的光能利用率与反射器的口径、收光角及抛物 镜主轴相对 LED 光源的角度的解析关系式。分析结果表明，反射器单位口径的光能利用率随口径的 变化并非单调，而是存在着峰值，当收光角为70.53°时，单位口径收光效率最大值；对一定光学扩展 量的抛物反射器，通过旋转 LED 光源，可以进一步提高光能利用率；抛物反射器的收光角不同，最 佳的旋转角度也不同。TracePro 仿真模拟结果与理论分析结论基本一致，所得结果为抛物反射器的优 化设计提供了理论依据。 关键词：抛物反射器；LED；汽车前照灯；光能利用率 中图分类号：U463.65＋1 文献标识码：A 文章编号：1001-8891(2009)06-0367-04 The Research of High Efficiency Parabolic Reflector for LED Headlamp YU Gui-ying ，JIN Ji (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou Zhejiang 310018, China) Abstract ：In view of characteristics of LED and requirements of automotive styling design, the geometric parameters which influence the energy efficiency of parabolic reflector have been analyzed. Deriving the closed relationship among the energy efficiency、aperture of reflector and the gathering angle and the rotate angle of LED which relatives to the axis of reflector based on nonimaging optics and photometry. The results show that with the changes of aperture the energy efficiency is not monotonic. When the gathering angle reaches to 70.53°, the efficiency has the maximum value; rotating the LED source can increase the efficiency; the gathering angle has different value and the optimum rotate angle also has different value. Through the simulation of TracePro, the conclusions accord with the theoretical analysis. The obtained results provide the theory basis for r