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为在平面上实现所需的照明,满足照明系统的要求,需要对光学系统进行二次设计。传统的设计方法往往用规则曲面指定透镜的一个表面,并以此为基础来设计另个一表面,这样会导致其表面形状复杂,不方便加工或装配。对此,提出了一种基于单曲面迭代计算的透镜曲面设计方法,即适当设计指定光线从透镜的一个表面到另一个表面的光路分布,再以此分别迭代计算透镜的各个表面。该设计方法采用两个自由曲面配合成曲面透镜,较以往的设计方法更加灵活、方便,设计得到的曲面镜头较以往更加简单光滑,便于加工和装配。结合一陈列灯镜头设计,给出了基于单曲面迭代计算的曲面透镜设计计算结果。
To achieve the desired illumination on a flat surface to meet the lighting system requirements, a secondary design of the optical system is required. Conventional design methods often use a regular surface to designate one surface of a lens and use this as a basis for designing another surface, which can result in complex surface shapes that are not easily machined or assembled. In this regard, a method of lens surface design based on single-surface iterative calculation is proposed, that is, the optical path distribution of the specified light from one surface of the lens to the other surface is properly designed, and each surface of the lens is iteratively calculated. The design method uses two freeform surfaces to form a curved lens, which is more flexible and convenient than the previous design methods. The designed curved lens is simpler and smoother than ever before, which is convenient for processing and assembly. Combined with the design of an exhibition lamp lens, the calculation results of the curved lens design based on the single surface iterative calculation are given.