减小球差的环带透镜设计

Annular lens design for reducing spherical aberration

根据光线经过折射面后像距和折射面参数之间的关系,将折射面划分为若干同心圆环,各圆环之间沿光轴有一定的轴向间隔。一束平行于光轴的光线入射后,经过不同部分光线的像点相互重叠从而使球差减小。根据上述思想用单透镜构造一个透镜称为环带透镜,然后以环数为2的透镜为例用CODE V进行像差分析。和双胶合透镜比较得出:环带透镜的球差、波像差以及轴上点的弥散斑优于胶合透镜,同时光学传递函数指标提高,接近衍射极限。

According to the relationship between the image distance and parameter of refraction surface,the refraction surface is divided into several concentric annulus between which exist certain distance along the optical axis.As a ray of parallel light incident,the different annulus of refraction surface making image position of incident ray overlap to reduce spherical aberration.According to the content mentioned above a lens with two annulus designed and then the aberration analyzed by CODEV.In compared with doublet lens:The spherical aberration、wave front aberration and the spot diagram of the lens are declined Further more MTF become better which are close to diffraction limit.