可變焦LED照明系統之光學元件設計

Abstract

LED 具有高效率、壽命長、反應速度快、體積小等的優點。而其能源節省、環境保護之特點，是永續發展的關鍵。因此，由LED取代傳統光源的時代即將來臨。而藉由良好的光學系統更能發揮LED的功能，達到照明光均勻及高效率的效果。 本研究提出一種光學設計，利用兩個非球面反光杯產生高品質的照明效果，並藉由反光杯與LED光源間相對的運動，使得照明光束可產生由聚集到發散的變焦功能。研究中利用光學軟體進行模擬，並以泛光的均勻性以及聚光效率為目標進行最佳化，改良反光杯的曲面參數。接著進行實驗以驗證設計的正確性，結果符合模擬之照明變焦效果。

LED has advantages of high efficiency, long life, fast response, small volume and so on. Power saving and environmental protection are also the key points of LED for sustainable development, so the epoch of using LED to replace conventional light source is coming. Through well designed optical system, engineers can produce LED light of better performance, and result in more uniform illumination and high energy efficiency. In this research, an optical design is brought up, which can achieve high illumination quality by using two aspheric reflectors. Through the relative movements of the reflectors and the light source, zoom function that can change illumination beam from convergence to divergence is obtained. Optical software is applied to system simulation, and optimization is performed to choose the parameters of reflectors with the objects of the uniformity of floodlight and the efficiency of spotlight. After that, experiments are carried out to verify the validity of the design, and the result corresponds to the simulation of zoom illumination.