Rectangular illumination has found extensive application in the field of LED lighting. In this paper, a design method for a combined lens has used the two characteristics of refraction and diffuse reflection for rectangular illumination. The combined lens is composed of a cutting lens and a pedestal. We determined the cutting lens through the shape of the target plane and then applied diffuse reflection material to the partial surface of the pedestal. The diffuse reflection material is used to improve the lighting efficiency of the target plane. The surface of the pedestal is obtained by lofting from the contour of the cutting lens to the contour of plane where the light source is placed. Based on this method, the combined lens is designed for rectangular illumination. The result shows that the performance of the target plane meets the requirements of rectangular lighting. The uniformity is about 88% and the lighting efficiency is improved to 75%.

中文翻译：

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矩形照明组合透镜的设计

矩形照明在LED照明领域得到了广泛的应用。在本文中，组合透镜的设计方法利用了矩形照明的折射和漫反射两个特性。组合镜片由切割镜片和底座组成。我们通过目标平面的形状确定切割透镜，然后将漫反射材料应用于基座的部分表面。漫反射材料用于提高目标平面的照明效率。底座的表面是通过从切割透镜的轮廓到放置光源的平面的轮廓放样获得的。基于这种方法，组合透镜被设计用于矩形照明。结果表明，目标平面的性能满足矩形照明的要求。均匀度约88%，光效提升至75%。