投射式車燈主要由光源、反射鏡面、遮光罩與透鏡等四個元件所組成。在傳統燈泡的設計上，先是以光軸旋轉對稱且光軸截面曲線為4次方程式的非球面方式來設計厚投射透鏡；再以垂直截面與水平截面不同狀外形的變焦多橢圓方式來設計反射鏡面，其曲面方程式仍保持橢圓形式，惟其軸長與焦距會隨光軸截面上之角度而漸變；遮光罩部份則以平面形狀來設計，其左半邊為水平而右半邊為一斜角。配合H1燈泡與上述三元件應用至近光燈的ASAP光學模擬中，產生之總光域為寬廣但不高的光型、明暗截止線清晰又平坦，在定性及定量上皆可符合歐洲法規之驗證規範。 隨著高亮度發光二級體的快速發展，其已逐漸成為車燈的光源之一。不同於傳統燈泡的使用，當以發光二極體作為車前燈的光源時必需考慮其它因素。在本文中，對主要相關因素提出討論並以一顆100流明且為特定光幅射分佈的白光發光二極體作為投射式車燈的光源，重新探討投射透鏡、多橢圓反射面、遮光罩的設計與各個參數的變化。 Projection Lamp is composed by four major parts : light source, reflector, shield and lens. In the design of traditional lamp, a aspherical model with 4th order equation in the cross-section is adopted to design aspherical lens. A polyellipsoid reflector surface with different vertical and horizontal cross-sections is used to keep the reflector in ellipsoid form but its axial length varies with the rotating angle. This reflector with variable axis can create very flexible light pattern. A flat shape of screen with horizontal in left hand side and declined down angle in right hand side is applied. The former designed 3 parts accompany with a H1 lamp can pass ECE regulation in ASAP simulation. With the rapid development of high power LED, it is gradually used as an light source of headlamp. Different with traditional lamp, there are a lot of factors have to be considered when LED used as a light source of front headlamp. In this paper, these major considerations are discussed. A 100lm with specific radiation pattern, white light LED is applied to redesign projection lens, polyellipsoid reflector and shield by changing related design parameters.
