摘要
针对投射式汽车前照灯光源利用率不高的缺点及近光光型水平方向约±20°的照射范围要求,提出以变椭圆轮廓的方法设计投射式前照灯的反射器曲面,分析了椭圆轮廓曲线对投射式前照灯配光的影响,给出了椭圆曲线的轴长变化规律,通过计算拟合得到了光滑的变椭圆反射面。在光学软件Lucidshape中对该变椭圆反射面构成的投射式前照灯光学系统的模拟结果表明,采用该变椭圆反射面比复合椭球面的光源利用率提高了10%左右,光型水平方向照射范围在±20°以上,能满足近光光型"宽而不高"的特点。
Since the efficiency of projector type headlamp is low, and its low beam has the requirement of extending about ±20° in horizontal direction, we present variable ellipse profile to design the surface of projector type headlamp, and analyze the effect of ellipses on headlamp＇ s light distribution, give the rule of ellipses, then fit the calculated profile and get smooth reflector surface. In Lucidshape software, the simulation of a projector type headlamp system which is composed of the said reflector demonstrates, compared with the traditional compound ellipsoid, the beam pattern in horizontal and vertical direction can match the low beam regulation and the system energy efficiency increases approximately 10% , and meet the feature of low beam pattern, which is ‘wide and not high’.
出处
《中国照明电器》
2011年第1期15-19,30,共6页
China Light & Lighting
关键词
投射式前照灯
变椭圆
近光
光型
projector type headlamp
variable ellipse
low beam
beam pattern
