数字微镜元件式自适应前照灯光学设计

Optical design of adaptive front lighting system based on digital micro mirror device

路面照明状况直接影响到汽车夜间行驶安全,自适应前照灯能根据汽车周围环境自动地调整照明模式,提高驾驶安全性。针对现有自适应前照灯照明模式不够灵活、光能利用率低等问题,提出了一种基于数字微镜元件的自适应前照灯光学方案,该方案以数字微镜元件为核心,并创新性地提出了利用第二导光管收集未利用的光能,采用光学软件Tracepro进行整个系统的仿真。实验结果表明:该方案能够实现自适应前照灯的多种照明模式,且通过使用第二导光管提高了光能利用率。由于可实现的照明模式多且照明灵活,能量利用率高,所以该系统具有广泛的市场前景。

The road safety of vehicles in night depends on the street illumination directly. Adaptive Front lighting System （AFS） can automatically provide different illumination modes by adjusting the shape, distance and light distribution of illumination according to the surrounding environment to improve the driving security. Considering the problems that less light efficiency of present AFS, one solution of AFS using Digital Micro mirror Device （DMD） was presented. It consists of lamp, reflector, light pipe, DMD and lens. DMD is the core of this system. And the second light pipe was used to collect the unused light energy. The experimental results show that the light efficiency is improved largely by the using of the second light pipe. And it can achieve different beams easily by accuracy controlling the luminance of every pixel on the screen. Because of its flexibility and higher light efficiency, this scheme is expected to show on market.