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针对目前LED准直透镜全反射部分多采用旋转抛物线或自由曲面从而增加加工难度的问题设计出一种结构简单、加工容易、准直效果好的LED准直透镜,该透镜由自由曲面折射面、全反射面和出光平面组成。采用自由曲面和全反射面相结合的方法,根据几何光学原理来构造自由曲面,利用Matlab编程计算出自由曲面面型数据并导入Solidworks建立透镜的实体模型。用Light Tools软件分析透镜的可行性。结果表明,在1500mm的探测面上可接收90.56%的能量,发光半角约为3°。为探讨LED尺寸对照明效果的影响,对透镜进行非序列光追迹。结果显示,当光源尺寸不大于1.4mm时,光能利用率达到50%时的照明距离超过7m。
Aiming at the problem that the total reflection part of the LED collimating lens mostly adopts the rotating parabola or the freeform surface to increase the processing difficulty, an LED collimating lens with simple structure, easy processing and good collimation effect is designed. The lens is composed of a free-form surface, Total reflection surface and the light plane composition. Freeform surface and total reflection surface are combined to construct free-form surface based on geometrical optics principle. Free-form surface data are calculated by Matlab and imported into Solidworks to build the solid model of lens. Light Tools software analysis of the feasibility of the lens. The result shows that 90.56% of the energy can be received on the detection surface of 1500mm and the half angle of light emission is about 3 °. To investigate the effect of LED size on the lighting effect, non-sequential light tracing of the lens was performed. The results show that when the light source size is not larger than 1.4mm, the illumination distance when the light energy utilization rate reaches 50% exceeds 7m.