实现LED准直照明的优化设计

Automated Optimization of Free-form Surface Lens for LED Collimation

为了有效地利用光源能量,满足LED远场照明系统要求,提出了一种实现LED大视场角准直照明的自由曲面透镜设计方法.运用ZEMAX软件序列模式下的多重组态建立透镜结构,在ZEMAX的二次开发环境下,采用宏语言编写自定义优化函数,实现对光学系统的自动优化.通过得到的自由曲面面型数据,借助光学仿真软件进行模拟,模拟光源采用圆面发光的LED朗伯体,视角为180°,透镜材料为PMMA,点光源模拟得到的发散半角在±0.1°以内,能量利用率在87%以上,实现了较高的能量利用率.

In order to achieve full light utilization and satisfy the demand for far-field illuminance of LED, automated optimization method in sequential mode of ZEMAX was proposed in the design of collimator with far field illuminance for LED source. The system was established in ZEMAX＇ s multiple configurations, and the user defined merit function was written out using ZEMAX Programming Language （ZPL） macros language. In the simulation, the material of lens is PMMA and the source is Lambertiantype LED light source, of which divergence angle is 180°. Optimum parameters of collimator were obtained via running an optimization. The optical simulation results show that an efficiency of 87% is achieved under a view angle of ±0.1° and for a point LED source.