近來，為了提供室內一個健康以及舒適的照明環境，因此將太陽光收集後，並引導至室內作為照明光源成為一種新的趨勢。而能夠將太陽光收集後並引導至室內的系統我們稱為日照系統。在眾多的日照系統中，有一項新穎的設計，稱為自然光照明系統(Natural Light Illumination System)，在系統的最前端，用來收集太陽光的元件為集光器，由於此系統為靜態式的，因此並無搭配追蹤馬達，以進行太陽光的最大效率追蹤。現今自然光照明系統所使用的集光器，其設計由稜鏡單元所組成，然而這樣的設計，使光線在結構內傳遞的過程中，會因為稜鏡的界面過多，造成能量損失非常大，接著由於集光器在設計上，只針對太陽光的正向入射作設計，因此集光器的容忍角非常低。而本論文對自然光照明系統，提出一項新式的集光器設計，此新式集光器整體為一個平板的形式，並且為一個雙層結構，上層為微稜鏡陣列與平面間隔排列，下層為導光層。在設計上，集光器的每個部分，都針對不同範圍的太陽光入射角度作設計，以提高整體集光器的容忍角，而在集光器的下層，我們使用導光層來將光線傳遞至出光口，並減少光線在傳遞過程中所遇到的界面數量，以降低能量損耗，利用這樣的構造設計出的新式平板集光器，其效率在正向入射時，效率為30%，而容忍角為20˚。

Recently, in order to provide a healthy and comfortable indoor illumination environment, the sunlight becomes an innovative and alternative light source. If a system can collect sunlight and transmit sunlight to the indoor for illumination, we call daylight system. Among various daylight systems, the innovative system is Natural Light Illumination System. The system is a static type, therefore, it doesn’t collocate with the sun tracking motor to track the sun orbit which has maximum power. Nowadays, in Natural Light Illumination System, the concentrator consists of prism units. This design occurs more energy loss, when the light transmits to the exit surface. Then, because the design of concentrator is just based on normal incidence of sunlight, it cause that the concentrator is just low acceptance angle. Therefore, this paper presents an innovative concentrator for Natural Light Illumination System. The concentrator is a planar form, and it is a two layers structure. Top layer consists of plane and micro prism arrays, the bottom layer is a lightguide. In design procedure, each part of structure is based on different incident situation of sunlight, then, the acceptance angle of concentrator can be increased. Finally, we use lightguide to transmit the sunlight. Because we decrease the amount of the interface in the lightguide, it can decrease the energy, when the light transmits to the exit surface of concentrator.

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