高功率發光二極體導光元件設計

本文針對發光二極體(Light emitting diode, LED)於晶片封裝後進行光學透鏡(Optical lens)設計，研究中利用光學原理與模擬軟體建立LED等效光學模型，並以蒙地卡羅光線追跡法(Monte Carlo ray tracing method)分析LED光源穿過透鏡後之光強度與光照度特性分佈。為改善LED光源之指向性，其首要目標為設計出可用於直接照明系統之光強度分佈曲線，並將其特性改變為均勻擴散光源，以提高在各種照明應用之自由度。此外，再藉由桌上型三軸CNC(Computer Numerical Control)工具機進行透鏡模具製作，以實現LED一次透鏡封裝體，並在相同條件下進行實驗量測驗證其光學模型準確度，最後結合CAD/CAM/CAE建立出一套非球面鏡設計與製造流程，結果顯示本研究方法不但可縮短光學元件設計與打樣時程，若與射出成型加工方式相較之下並能有效降低製作成本。

關鍵字

LED ； Optical lens ； Monte Carlo ray tracing method ； Batwing ； Computer Numerical Control

並列摘要

In this paper, we design an optical lens for LED after chip package. We used principles of optics and simulation software to build equivalent model for LED during the research process. By using the model, the performance of light intensity and illuminance are simulated by Monte Carlo ray tracing method when optical line of LED across lens. For improve the directional of LED light, the primary goal in this research is that the curve of light distribution can be used in direct illumination system, and changes from directional to diffused-type of light source for increase the degrees of freedom in various lighting applications. Moreover, we were fabricating molds of lens by Computer Numerical Control to carry out first lens package of LED and verification the accuracy of optical model by experimental measurements in the same condition. Finally, we combined that CAD/CAM/CAE to build a process for design and fabricate of aspheric lens. The results show that the research approach in this paper could be decrease the time of designing and fabricating. If we compare the approach with mold injection, we find that this approach has low cost and more convenient.