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介绍了渐变镜片的基本结构及工作原理,给出其基于狄利克雷条件的软设计方法。根据曲面的微分几何理论,对渐变镜片性能进行分析评价。举例设计了光焦度增量为2 50m-1的几种渐变镜片。通过对其球面度和柱面度的数值分析,指出镜片子午线光焦度渐增方式的选取明显地影响镜片球面度和柱面度的大小和分布,由此,可设计满足不同使用要求的渐变镜片。
The basic structure and working principle of progressive lens are introduced, and the soft design method based on Dirichlet condition is given. According to the differential geometry theory of curved surface, the performance of progressive lens is analyzed and evaluated. For example, several gradient lenses with an optical power increment of 250m-1 were designed. Through the numerical analysis of its spherical and cylindrical degrees, it is pointed out that the selection of the gradual increase of the lens radial power obviously affects the size and distribution of the spherical degree of the lens and the degree of the cylindrical degree. Thereby, a gradual change can be designed to meet different requirements lens.