臺灣因核能發電機老舊需要除役，除役後的電力缺口目前還無完善的補救辦法，會有缺電的危機，因此節能是個很重要的課題，在照明上有研究提出自然光照明系統，將陽光直接導入室內作為照明使用，簡少白天在室內使用人工光源以達到節能的效果。自然光照明系統分為四大子系統：前集光、集光、傳光、放光。前集光子系統能將不同太陽仰角的光反射至集光子系統提升集光效率，集光子系統的功能是收集壓縮太陽光，在借由傳光子系統將光線傳送到室內，最後由放光子系統進行放光動作。
光線經過集光子系統後，因集光器結構複雜在出口產生發散光源，但太陽會隨著時間改變仰角，當角度改變集光器出口的光源分布也會跟著改變。
本文針對圓盤集光器出光口設計一多角度準直透鏡。透過模擬分析得知不同仰角入射光在經過圓盤集光器後會產生-30˚~30˚之間的不同能量角度光線。透過橢圓曲面和折射面法建立出多角度準直透鏡。加了多角度準直透鏡的圓盤集光器能準直-30˚~30˚之間的光線，延長了照明時間，且效率比未加準直透鏡的圓盤集光器效率高了8倍，準直後的光能長距離直線傳輸，並能省去光纖過光管等光傳輸原件，也不會有在傳輸時造成的損耗。

In Taiwan, nuclear power generators need to be decommissioned. There is no perfect remedy for the power shortage after decommissioning. There will be a crisis of power shortage. Therefore, energy conservation is an important issue. In lighting, research has proposed a natural light illumination system. The sunlight is directly introduced into the room for use as lighting, and the artificial light source is used indoors during the day to achieve energy saving. The natural light illumination system is divided into four subsystems: Before collecting light, collecting light, transmitting light, and concentrating, the light collecting subsystem can reflect the light of different solar elevation angles to the light collecting subsystem to enhance the light collecting efficiency. The function of the light collecting subsystem is to collect compressed sunlight, by means of the light transmitting subsystem. The light is transmitted to the room, and finally the light-emitting subsystem performs the light-emitting action.
After the light passes through the light collection components, the divergent light source is generated at the exit due to the complicated structure of the light collection components, but the sun changes the elevation angle with time, and the distribution of the light source at the exit of the concentrator changes when the angle changes.
In the paper, a multi-angle collimating lens is designed for the light exit of the disc concentrator. Through simulation analysis, it is known that incident light of different elevation angles will produce different energy angles between -30 ̊ to 30 ̊ after passing through the disk concentrator. A multi-angle collimating lens is created by an elliptical surface and a refractive surface method. A disc concentrator with a multi-angle collimator lens can collimate light between -30 ̊ to 30 ̊, prolonging the illumination time and is more efficient than a disc concentrator without a collimating lens. Times, the collimated light energy can be transmitted in a straight line over a long distance, and the optical transmission original such as the optical fiber light pipe can be omitted, and there is no loss caused during transmission.

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