连续变焦距镜头焦距实时输出问题研究

Active focal length output of zoom lens

用于精密跟踪测量的变焦距镜头为了满足精确测量的需求,需要实时输出准确的焦距值。本文在简单介绍连续变焦距光学系统的分类,以及基本结构形式和原理的基础上,着重分析了其在变倍过程中焦距值实时输出的理论基础,实现方法和存在的问题。

For the precision demand,the zoom lens used in capturing and tracing must output the focal-length accurately.In this paper,basic classes,structures and principle of zoom lens are briefly described.We analyses mainly active focal distance output of zoom lens,including basic theory,achieving ways and some problems.