隨著人類文明的發展，能源的消耗量也與日俱增，有鑑於能源危機、地球暖化，太陽能源的發展已經成為綠能產業中主要趨勢，越來越多學者投入自然光照明的領域，因而設計出將太陽光直接傳遞至內部照明的採光系統，稱為自然光照明系統。自然光照明系統分為三個子系統:集光、傳光以及放光，整個系統的效率為三個子系統效率的相互疊加。其中，集光系統出光口的光線角度分佈雜亂，角度偏折的光線會在傳光系統中發散，無法傳遞至放光子系統，造成整體效率下降。
因此，本論文提出了一個自由曲面微透鏡準直器，透過虛擬面的設置，了解光磚出口光線的角度與分布，針對非準直的光線來設計微透鏡，透過不同曲率的透鏡將不同角度的光線折射成近平行光，最後將許多微透鏡組合成一自由曲面微透鏡準直器，應用在光磚出口，來提高光線在集光子系統內傳輸的效率，讓傳光模組能傳遞足夠的流明數至室內進行室內照明。通過這樣的準直器設計後，成功的將光線收斂至±2°，出光口的耦合效率為82%。

Due to the energy crisis, each country takes environmental issues seriously. Renewable energy has become the most popular research topics. Among renewable energy sources, the sunlight is the most abundant and distributed widely, many researches have developed daylighting systems to save electricity consumption. Natural Light Illumination System (NLIS) is one of the daylighting systems that transform the natural light for interior illumination. The NLIS system is composed of three sub-systems, light collection, light transmission, and light emission. The overall efficiency of the NLIS is the sum of the three subsystems. Due to the refraction of light in different mediums of NLIS, the angle of the light is changed, this change resulted in reduction of transmission to the interior.
This paper presents an innovative freeform lens used in NLIS, which combines free-form lens to produce parallel beam and increases the natural light efficiency for interior illumination. We establish a surface to analysis the light distribution, such as the location, angle, and energy. When the collimator is manufactured, the positions of lens are adjusted so that parallel beams can be obtained, and the collimator is able to gather more energy from the collection system and insert into the transmitter system.
These results lead to a desirable performance for the collimator, the rays converge to ± 2 °and bring the efficiency up to 82%.

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