本論文成功提出使用雙晶封裝之白光 LED 光源用於德國 StVZO 22a 法規自行車前燈之新設計方法。在商業考量下，此光學設計具有低成本與節能之優點。研究過程分為六大部分，分別為低成本光源分析、光源模型建立、下打式多重反射面光學設計、模型製作並實驗驗證，光形黃暈分析與黃暈解決技術。 在論文中，我們藉由權重因子來建立雙晶白光 LED 的光源模型，二階光學設計使用下打式多重式反射面，並實際製作樣品來驗證模擬，其實驗結果均通過德國 StVZO 22a 法規，其光形具備高對比度之明暗截止線與廣泛路照。接著討論光形截止線附近的黃暈現象，我們藉由輻射藍光及轉換黃光強度分布之權重因子優化原始的白光 LED 光源模型，其用來解釋光形截止線附近的黃暈，並且提出一解決方案以塑造更高對比度的明暗截止線以及減少黃暈現象。 ;In this thesis, we successfully propose a novel method to design a bicycle head lamp using a LED with separate dies, which meets the German StVZO 22a regulation. Under commercial consideration, the optical design is low-cost and energy-saving. The research is divided into six parts. The first is the analysis of low-cost LED. The second is optical modeling of the light source. The third is the optical design of a downward multi-segment reflector. The fourth is the experimental verification of the designed reflector. The fifth is to analyze the yellowish problem. The final is to propose a way to eliminate the yellowish pattern. We use the weighting factor to build the optical model of the white LED with separate dies. The downward multi-segment reflectors are designed and fabricated to verify the simulation results. The experimental results have all passed the German StVZO 22a regulation. Moreover, the light pattern has a high-contrast cutoff line and broad illumination on the roadway. Then, we describe the yellowish outer pattern with a modified two-color optical model. We propose a solution to design a high-contrast light pattern and reduce the yellowish effect.
