能源的使用帶來許多環境的問題，為了改善非再生能源產生溫室氣體造成全球暖化的問題，有研究提出自然光照明系統之設計，將陽光直接導入室內作為照明使用，使人類在室內也能得到陽光的照明減少人工照明的能源使用，自然光照明系統分為四大子系統：前集光、集光、傳光、放光。前集光子系統負責將陽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太陽光，並且通過傳光子系統將收集的光線傳送到室內，最後由放光子系統做室內照明。
由於太陽光經過集光子系統的折射與反射後收集的光線會發散，導致傳光子系統的效率降低，對自然光照明系統的效率將產生影響，因此本論文將針對自然光照明系統之集光元件光磚設計準直透鏡，使光磚出光口之光線能夠收斂為近平行光，提升傳光子系統的效率進而達到自然光照明系統整體的高效率。本論文採用自由曲面之設計，根據光磚之出光口的光線分佈，應用幾何光學分析，計算斜率將光線折射或反射至特定方向，自由曲面依照計算得出的斜率建構，再利用光學模擬軟體分析準直透鏡的效果。
通過光學模擬驗證，本論文設計方法可以在發散角±2°內的光通量達到95.3%，在使用準直透鏡的情況準直透鏡效率可以達到85%，光磚的出光口經過準直透鏡有效的提升自然光照明系統的效率。

Effects of non-renewable energy on the environment is serious. In order to reduce the level of global warming caused by greenhouse gas, some studies have proposed the design of daylighting system, which guide sunlight into a room for lighting so that humans can receive sunlight in the room and can save energy. Natural Light Illumination System(NLIS) is a daylighting system. NLIS divided into three main subsystems: collecting, transmitting and emitting. The collecting subsystem collects sunlight, and the sunlight is transmitted to the room through transmitting subsystem, finally emitting subsystem is used for indoor lighting. The sunlight will diverge through the collecting subsystem, so the efficiency of the NLIS is reduced.
The sunlight will diverge through the collecting subsystem, so the efficiency of the NLIS is reduced. This study focus on the collimator lens for the collecting component, which is called lightbrick. The collimator lens can converge light into near-parallel light, improve the efficiency of the light-transmitting subsystem and achieve the high efficiency of the NLIS. We use the design of freeform surface. According to the light distribution of the lightbrick, we can use geometric optical analysis to calculate the slope. Freeform surface is constructed with the calculated slope.
Verified by optical simulation, using the collimator lens can achieve 95.3% luminous flux within ±2°, and optical efficiency can achieve 85% in the collimator lens output. The collimator lens converges the light distribution of lightbrick and enhances the transmission efficiency of NLIS.

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