本論文主要針對多段面反射鏡鍍膜車頭燈雜散光分析，探討鋁製光杯與塑膠製鍍鋁光杯兩種材質在相同結構條件下之近光光學性能差異。自行車照明產品要量產必須同時滿足STVZO 及 K-mark 等國際法規，鋁製光杯具有高反射率及穩定光型特性，但在重量級成本上於量產上較於劣勢，相對地，塑膠鍍鋁光杯具有較輕且低成本之優勢，但其鍍膜之均勻性會影響光型，導致不合法規。 鋁製光杯之光型在Cut-off line銳利度、雜散光表現均較符合量產法規之要求，若需要使用塑膠製鍍鋁之光杯以降低成本，仍須要改善鍍膜製程導致間隙處沉積不均勻造成光型不合規的問題。遮擋能夠有效地改善雜散光的問題。此研究結果可作為未來自行車車燈光學設計與材料選用之參考，並建議後續可以結合鍍膜技術優化、熱變型模擬分析等以提升產品性能，使之更符合國際市場及量產需求 ;This thesis investigates stray light issues in multi-segment reflector headlamps by comparing the low beam optical performance of two materials: aluminum reflectors and plastic reflectors with aluminum coatings, both sharing the same geometry. To be suitable for mass production and international markets, bicycle lighting products must comply with standards such as StVZO and K-mark. Aluminum reflectors offer high reflectivity and stable beam patterns, which are advantageous for meeting regulatory requirements—but they tend to be heavier and more expensive to manufacture. In contrast, plastic reflectors with aluminum coatings are lighter and more cost-effective, but non-uniform coating can lead to poor beam quality and failure to meet regulations. Our findings show that aluminum reflectors perform better in terms of cut-off line sharpness and stray light suppression—both key factors for regulatory compliance. If plastic-coated reflectors are used to cut costs, the coating process must be improved, especially to fix uneven deposition around the segment gaps that causes beam distortion. Adding shielding structures helps reduce stray light, but this alone cannot resolve the core problem. The results of this study may serve as a reference for future optical design and material selection in bicycle headlamps. Further improvements, such as optimizing the coating process and conducting thermal deformation simulations, are recommended to enhance performance and ensure mass production readiness for the global market.
