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为了使以发光二极管为代表的光源在照射目标平面上获得高分辨率的并具有复杂预定形状的远场照度分布,提出了从照射目标平面向光源映射、基于微带表面构型的分离变量三维自由曲面非成像光学系统设计方法。首先,计算依赖于映射关系的表面法向矢量;其次,逐步计算网格格点和表面微带的边缘曲线形状;最后,将所有表面微带联结在一起构成光学系统的表面。该设计方法具有无需误差校正过程,可以高效设计具有复杂照度分布形状的光学系统等独特优势。高分辨率光线追踪模拟结果表明,对于照射目标平面上的棋盘状和条状等多种预定照度分布形状,应用该方法均可高效地获得精准的非成像光学系统。
In order to obtain a high-resolution and far-field illuminance distribution with a complex predetermined shape on the irradiation target plane, a light source represented by a light-emitting diode is proposed. The mapping from the irradiation target plane to the light source is performed. The separation variables based on the microstrip surface configuration are three- Design Method of Free - form Non - imaging Optical System. First, the surface normal vector that depends on the mapping relationship is calculated. Secondly, the shape of the edge curve of the mesh grid and the surface microstrip is calculated step by step. Finally, all the surface microstrips are combined to form the surface of the optical system. This design method has the unique advantage of being able to efficiently design an optical system having a complicated shape of illumination distribution without error correction. The results of high-resolution ray tracing simulation show that this method can obtain accurate non-imaging optical system efficiently for a variety of pre-determined illumination distribution shapes such as checkerboard and strip on the target plane.