Design of A Headlamp with Freeform Reflectors   

Shi Weibin^1*,Xia Guanqun², Zhuang Meilin², Chen Xiangxi¹  Li Shuzhi², Su Shengjun¹

¹Schoolof Optical-Electrical and Computer Engineering, University of Shanghai forScience and Technology; Shanghai, P.R.China

²ShanghaiSemiconductor Lighting Engineering Technology Research Center; Shanghai,P.R.China

*Contact email address: shiweibin@usst.edu.cn

Abstract—Headlamps with freeform reflectors have simplermechanical structures and are easier to be fabricated compared to other typesheadlamps. In this paper, we presented a design of a kind of headlamps capableof providing both low beam and high beam lighting. Two arrays of LEDs were usedas light sources for low beam and high beam lighting respectively. A freeformreflector was designed to control light distribution. Switch of low beam orhigh beam lighting was implemented by turning on or off the two arrays of LEDs.Simulation results showed that the headlamp we designed satisfied allillumination requirements of low beam and high beam lighting defined by thenational standard. There were clear cut off lines on the test screen. We made aprototype and tested its performance in a laboratory with a standard testscreen. Preliminary test results indicated that the prototype, driven by about60% of the full power, met the requirements at most measuring points defendedby the standard.

Keywords-freeform reflector; headlamp;solid-state lighting