采用小功率LED的汽车前照灯光学设计

为克服普通灯泡汽车前照灯耗能高、寿命短和现有LED(发光二级管,Light-Emitting Diodes)前照灯成本高的缺点,提出了一套采用小功率LED的汽车前照灯光学设计方案。采用48颗小功率LED,使得每颗LED照亮配光屏上的一块矩形区域。对单颗LED设计自由曲面透镜,光线经透镜出射形成一个矩形光斑。点亮不同的LED以及调整车灯的照射方向可以满足照明要求。模拟结果符合国家标准要求。采用小功率LED比普通灯泡寿命长,比大功率LED前照灯成本低,可靠性强,并且还能部分实现自适应前照灯的功能。

Optical design of low-power LED automotive headlamps

In order to overcome the shortcoming of high energy consumption,short life of ordinary light bulb automotive headlamps and high cost of current LED(Light-Emitting Diodes) headlamps,an optical design scheme of low-power LED headlamps is introduced.48 pieces of low-power LEDs are used,so that each LED can illuminate one rectangular area on the measuring screen.A free-form lens is designed for one single LED;the lights will generate a rectangular beam region after passing through the lens.Lighting up different LEDs and regulating the irradiation direction of the lamp can satisfy the lighting demands.Ray tracing simulation results comply with the Chinese Regulation.The life of low-power LEDs is longer than ordinary bulb.This lamp is lower cost and higher reliability compared with high-power LED headlamp.Some functions of AFS(Adaptive Front-Lighting System) can also be achieved.