在車頭燈的光學設計中，對於光型皆有一定規範，為避免雜散光影響到其他用路人，光型具備明顯截止線，具有高對比度的要求極其重要。常用的法規有K-mark和E-mark，為了達到法規的要求，檢測面上之光型的最亮點位置須盡可能貼近截止線，使之更容易地通過法規。 傳統中，若要達到最亮點位於截止線上，會使用遮擋方式，將一個圓形光型遮擋掉一半，即可達成目的。然而，這種方式會降低光學使用效率，並且使得產品也不美觀。 因此，本論文提出一種光學設計，只使用反射杯而不需要進行遮擋，同時能使最亮點位置盡量接近截止線，並且通過K-mark和E-mark法規。 最後，為使光型能更加柔和，研究中將同時使用柱狀透鏡陣列，使光型能橫向展開，更適於實際產品的應用。;In automotive headlamp optical design， the light distribution pattern is subject to specific regulatory requirements. To prevent stray light from causing discomfort or glare to other road users， the light distribution pattern must exhibit a distinct cutoff line， making high contrast an important design consideration. Common regulations include the K-mark and E-mark standards. To satisfy these regulatory requirements， the brightest point of the light distribution pattern on the test screen should be positioned as close to the cutoff line as possible， thereby facilitating compliance with the regulations. Conventionally， a masking method is employed to position the brightest point on the cutoff line. In this approach， approximately half of a circular light distribution pattern is blocked to achieve the desired light pattern. However， this method reduces the optical efficiency of the system and may also compromise the aesthetic appearance of the headlamp. Therefore， this thesis proposes an optical design that utilizes only a reflector without additional masking， while positioning the brightest point as close to the cutoff line as possible and satisfying both K-mark and E-mark regulatory requirements. Finally， to obtain a smoother and more uniform light distribution pattern， a cylindrical lens array is incorporated to spread the light distribution laterally， making the proposed optical design more suitable for practical automotive headlamp applications.
