基于非球面透镜激光车灯的设计与加工

Design and fabrication of a aspheric lens for laser lamps

激光车灯对比于LED车灯,具有能耗小、体积小、亮度高等优点,是汽车车灯发展的新方向。基于此提出了一种低功耗、高亮度的激光车灯的光学系统结构。通过搭建光学测试平台研究激光二极管经过荧光片变为白光光源的特征参数,如光源的尺寸、光通量等,从而建立光源模型。由点光源和接收面能量的映射关系,求解激光车灯透镜的初始面型。根据所建立的光源模型对透镜初始面型进行优化设计,得到最终结果。所设计的非球面透镜利用超精密加工实现,并对激光车灯进行了组装和测试,12.16W电功率驱动下,25m处的照度约为106lux。

Compared with LED lamp, laser lamp has the advantages of small energy consumption, small volume and high brightness. It is a new direction of automobile lamp development. An optical system structure of low power and high brightness laser lamp is proposed. By building an optical test platform, the characteristic parameters of laser-driven white source are studied, which include the shape and size of the light spot and luminous flux. The light source model is established. The mapping relationship between the energy of point source and receiving surface is solved, and the initial surface shape of lens is solved. According to the source model studied, the initial lens is optimized, and the final design meets the requirements well. The designed aspheric lens is realized by ultra-precision machining, and the laser lamp is assembled and tested. The illumination at 25 m is about 106 lux driven by 12.16 W electric power.