We present a design for a cost-effective low-beam automotive headlamp with a single light-emitting diode (LED) light source. The proposed design consists of a white LED, an elliptical reflector, a parabolic reflector, a toric lens, a filter, and a prism array. The white LED had a luminous flux of 146 lm. Non-sequential rays were used to improve the efficiency and a toric lens was employed to optimize the light pattern on a 25 m screen which appeared as rectangular with a high degree of uniformity. In addition, the filter and the prism array were modified to correct the measured light pattern results to meet the requirements of ECE R112. We set the reflectivity of the elliptical and parabolic reflectors for the compound reflectors to be 95%. The transmittance of each surface of the toric lens is 98%. The total received lumens was 80.62 lm, and the overall efficiency was 55.22%.

中文翻译：

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具有白光 LED 的经济高效的近光灯的光学设计

我们展示了一种具有单个发光二极管 (LED) 光源的经济高效的近光汽车前照灯设计。提议的设计包括一个白色 LED、一个椭圆形反射器、一个抛物面反射器、一个复曲面透镜、一个过滤器和一个棱镜阵列。白色 LED 的光通量为 146 lm。使用非连续光线来提高效率，并采用复曲面透镜来优化 25 m 屏幕上的光图案，该屏幕呈现为具有高度均匀性的矩形。此外，对滤光片和棱镜阵列进行了修改，以校正测量的光图结果，以满足 ECE R112 的要求。我们将复合反射器的椭圆和抛物面反射器的反射率设置为 95%。复曲面镜片各面的透光率为98%。总接收流明为 80.62 lm，