Asymmetric Double Freeform Surface Lens for Integrated LED Automobile Headlamp

Abstract

We propose a design method of asymmetric double freeform surface lens for an integrated LED automobile headlamp and develop an integrated LED automobile optical system. A single asymmetric double freeform surface lens is designed to redistribute rays emitting from the light source for realizing both low and high beams. Moreover, a freeform surface reflector is used to improve the energy efficiency of high beams. The prism placed in the optical path can suppress chromatic dispersion on the edge of the target plane. Simulation and experimental results show that the illumination values and color temperature of the key points can fully meet the requirements of United Nations Economic Commission for Europe vehicle regulations (ECE) R112, 48, and 128. The volume of the whole optical system comprised of freeform surface elements is smaller than that of the low beam system of a traditional headlamp, resulting in saved space, in which other electronic devices can be installed for the safety of the driver, which indicates that the proposed method is practical in the field of automobile lighting.

Development of Radiator with Thermoplastic Polymer and Insert-Molded Aluminum Alloy Parts for Light-Emitting Diode Headlights

“…LED headlights are expected to completely replace energy-intensive car lights over time. With the evolution of automotive technology, the application of high-power, high-brightness LEDs in the vehicle headlight market has attracted considerable attention, especially in the electric vehicle market; however, battery life remains a major limiting factor [1][2][3][4][5]. At a given current, the luminous intensity of white light is approximately 180 lm/W, which is considerably higher than that of traditional light sources.…”