LIGHTING DESIGN OF HEADLAMP FOR ADAPTIVE FRONT-LIGHTING SYSTEM

摘要

This work develops a projector headlamp optical design to satisfy the regulations of AFS (adaptive front-lighting system) light patterns including Basic, Town, Motorway, and Wet road modes. An adopted aspherical model with 4th order cross-section equation designs a thick projection lens for good focusing results. A proposed polyellipsoid reflector equation with variable axis makes possible a more simple and efficient reflector design. Two plat screen angle design applications, corresponding to two types of AFS light pattern cut-off lines, minimize manufacturing difficulties. Light distribution, qualitatively and quantitatively, meets AFS draft requirements in two passing beam concrete design examples using the H1 and HID bulb, the new proposed asymmetric reflector surface, and two screens.