基于自由曲面的TIR型LED准直系统的研究

Research of TIR LED Collimator Based on Freeform

为了收集大角度的LED光线以获得小发散角的准直光束,设计并优化了高效、结构紧凑的TIR式LED准直系统。首先根据斯涅尔定律及等光程原理,计算准直系统的初始结构。利用Lighttools软件对初始结构优化设计,最终得到最佳结构的LED准直系统。TIR型准直系统的半口径为18mm、厚度为23mm、准直度(发散角)为1.5o,光能利用率高达89.5%,局部范围内光斑均匀性为92.34%。系统优化后光能利用率和目标面照度的均匀性均有所提高。基于TIR结构的LED准直系统具有光能收集效率高、准直度好、结构紧凑、体积小、便于应用等特点。

In order to collect a wide angle range light to receive the collimating beam of a small divergence angle, a highly efficient, compact, TIR collimating system has been designed and optimized. First, calculate the initial structure of the collimating system according to Snell＆#39;s law and equal focal length principle. Then optimize the initial structure using Lighttools optical design software. Finally, the best LED collimating system has been successfully designed. The TIR collimating system is 18mm, the diameter is 23mm. The collimating angle is 1.5＆#176; .The light energy utilization rate is 89.5%,the uniformity of spot in local range is 92.34%. The light energy utilization ratio and uniformity of illumina-tion in the target surface are improved. The TIR LED collimating system, which is small and easy to use, not only has a high light energy utilization ratio but also a compact structure.