LED Direction Indicators Design with Asymmetric Fresnel Lens

摘要

The paper presents the LED direction indicators design with asymmetric Fresnel lens, which meets the ECE R6 criterion. The opto-mechanical design software, ASAP, is adopted for the analysis of light flux. The results show that Lambertian LED and the asymmetric Fresnel lens can produce an asymmetric lightspot which is about 20 degree in horizontal and 10 degree in vertical. Therefore, the minimum requirement of LED light flux is 38 -55 lm lower in the design; it is lower than that for thin flat-convex lens, and much lower than the traditional bulb P21W.