本研究主要是使用印刷塗佈製程方式，在電路板表面上塗佈高反 射率防焊油墨製作階梯式的一次光學反射面取代二次光學元件，提升 光利用率，讓原本為發散光的裸晶LED(如覆晶)達到聚光效果。本研 究先以光學模擬軟體 TracePro 進行模擬、設計以及分析，並利用田 口實驗計畫法，設定各項參數，優化其結果，最後實品製作呈現。本 研究選擇四個不同的控制因子來進行優化，分別為印刷層厚、層間幅 寬、印刷層數與封裝膠折射率。研究結果顯示，在相同曲率下，若使 用完美曲面只可使原本的發散光源聚光到133 度，但若利用階梯光學 設計與優化，可使發散光源達到聚光效果97.56 度。;The study uses the method of printing coating process to produce echeloning first optical reflective surface to replace secondary optical components by coating high reflective resist ink on the surface of circuit board. This new method can improve light efficiency, and achieve concentrating effect of the nude crystal LED (such as Flip-chip). In this study, we use the optical software – TracePro, to simulate and analyze the model, and to optimize the result by Taguchi method. In the end of this research, we realize the idea by a prototype. We choose four different factors to optimize including printing thickness、width between layers、 printing layers number and the refractive index of silicone. Under a fixed curvature, compare to the conventional simulation using a perfect surface on the top of the nude crystal LED (diverging angle 180∘) which can only concentrate the light becoming to 133∘,our new method using echelon optics can narrow the diverging angle down to 97.56∘.
