基于近焦点非球面透镜的LED均匀照明设计

Design of high power LED uniform illumination system based on near-focus aspheric lens

摘要: 依据几何光学和非成像光学理论，提出了一种基于大尺寸近焦点非球面透镜的大功率LED均匀光源设计方法。在该方法中，首先根据选定参数的LED通过几何光学理论初步设计非球面透镜参数，然后在ZEMAX软件中对非球面透镜参数进行基于评价函数的优化，得到焦距76.79 mm、直径为200 mm的非球面透镜。将非球面透镜导入TRACEPRO软件建模并进行光线追迹仿真，根据仿真结果获得最优透镜参数进行加工和下一步实验。实验结果表明：均匀照明系统可以在60 cm处实现发散角±8.53°的均匀照明，光斑均匀性达到95.82%。

Abstract: A high-power LED uniform light source with one large-size near-focus aspherical lens is designed based on the principles of geometric optics and non-imaging optics. First of all, the parameters of the aspherical lens are obtained according to the geometric optics theory. Then, the aspherical lens is optimized in ZEMAX according to the evaluation function to focal length of 76.79 mm and diameter of 200 mm. The aspherical lens is further imported into the software TracePro for ray tracing simulation. According to the simulated results, the aspherical lens is machined for the next experiment. The experimental results indicate that the uniform light source can reach the target with a divergence angle of ±8.53° at 60 cm and uniformity of 95.82%.