近年來太陽光成為替代能源中熱門議題之一，太陽光擁有足夠的能量並取之無窮，在綠色照明的概念佔有重要的地位，因此許多相關產業及學者紛紛投入其中。目前本實驗室研發了自然光照明系統，系統可分成三個部分: 集光、傳光以及放光。每個系統環環相扣缺一不可，其中因為集光系統的稜鏡單元會造成光磚出口有光線發散的現象，導致只有部分光線可以進入傳光系統，整體光模組效率因此不佳，對自然光照明系統最終端之成效影響甚距。
在此本論文提出一個具有無焦系統與全反射透鏡的光準直器，透過全反射透鏡來收斂發散的光束，並使用無焦系統來壓縮光束面積比例，解決光線無法進入傳光系統造成能量的損失。加裝上第二代光準直器後，光束可被收斂至± 5度之內，同時將傳輸距離從0m提升至0.8m，在這段傳輸距離中整體平均效率可提升10%。初代與第二代相較之下，從模擬結果可得知，第二代光準直器在各方面的數據比較幾乎皆優於初代光準直器。

Recently, sun light had become top issue of alternative energy. The sun light played an important role in concept of “green light”, because the sun light had sufficient energy and never run out. Then, many scholar and industry had participated in this issue. Therefore, we developed the Natural Light Illumination System (NLIS). The core of NLIS is to improve the sunlight utilization that directly using sunlight, and avoiding loss of energy transformation. This paper presents an innovative freeform lens used in NLIS. NLIS is used to guide the natural light indoors for illumination, which system is implemented in energy saving smart buildings to reduce energy consumption. In developing a daylighting system, the overall system efficiency is crucial. In the NLIS, whether the light propagates parallel strongly affects the efficiency.
This research presents a novel design which use TIR lens, convex lens and concave lens in the NLIS(Natural Light Illumination System). The TIR lens are used to collimate the light, then convex lens and concave lens are used to compression the area of exiting light. The light ray had converged within ± 5 degree after collimator fix on. Simultaneously, transmission distance had increased 0.8m from 0m and increased overall average efficiency 10%. t. Results also had shown that the efficiency in terms of achieving collimated light and collimation using collimator at the output of light collection system, is better than the systems without collimator and previous collimator.

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