提出一种能实现准直光束照明的自由曲面透镜设计算法, 并基于此算法设计一种以单颗LED为光源的准直透镜。通过建立透镜后表面轮廓曲线上的点所满足的方程, 利用迭代方法并结合Matlab编程求出自由曲面轮廓曲线的离散数据点, 将数据点导入SolidWorks中进行曲线拟合并建模, 进而得到透镜的实体模型。在TracePro中对该透镜进行非序列光线追迹, 模拟结果表明: 该光学系统能够实现均匀照明, 并对最终光线可实现准直出射。

A design algorithm that can realize the collimating beam of light was proposed based on free-form surface lens,and an illumination optical system for a single LED source was designed based on the algorithm. The equations of the points on the profile curve about the back surface of the lens were established .By using the iterative method and Matlab programming, a number of discrete points of the free-form profile curve were calculated and fitted to optical entity with the SolidWorks software.Then the optical entity was imported into TracePro software for non-sequential ray tracing.The simulation results show that the optical system can achieve uniform illumination and collimate beam.