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利用圆环形LED光源阵列结构,结合反射杯与自由曲面透镜的混合型配光,设计了可以实现对汽车前照灯远光和近光同时配光的光学系统。对经反射器聚光后的光线及配光屏幕进行了适当的网格划分,根据能量守恒定律,建立了出光角、自由曲面透镜与配光屏幕之间的坐标关系。结合折射定律,通过迭代计算得到自由曲面透镜上的点坐标,并使用三维建模软件得到透镜模型。利用Tracepro软件对光学系统模型进行了光线追迹。结果表明,所设计的光学系统可以同时满足GB 25991-2010《LED前照灯标准》对LED前照灯远光和近光的配光要求,与传统的LED前照灯相比,能耗可降低至原来的75%。
The annular LED light source array structure is used in combination with the mixed light distribution of the reflective cup and the free-form surface lens to design an optical system which can simultaneously illuminate the high beam and low beam of the automobile headlamp. Based on the law of conservation of energy, the coordinates of the light exit angle, the free-form surface lens and the light distribution screen are established. Combined with the law of refraction, the coordinates of the points on the lens of freeform surface are obtained by iterative calculation, and the lens model is obtained by using the three-dimensional modeling software. The optical system model was traced by using Tracepro software. The results show that the designed optical system can meet the requirements of GB 25991-2010 “LED headlamp standard” for the distribution of high beam and low beam of LED headlamp. Compared with the traditional LED headlamp, the energy consumption can be Reduce to 75% of the original.