摄像机变焦距物镜的焦距输出及精度分析

用于测量电视系统的摄像机上的物镜不同于普通的变焦距镜头,它要求带有焦距实时输出装置。本文简述了变焦距镜头的基本结构和焦距输出电路原理,着重分析了焦距输出与测量精度的关系,得出改变变焦距镜头的凸轮曲线可以改变测量精度在不同焦距值下的分布。

Focal Distance Output of Camera Zoom Lens and Accuracy Analysis

Zoom lens for measument televesion system is different from the ordinary. It is needed for a real-time output equipment of focal distance. In this paper, basic construction of zoom lens and principle of the focal distance output circuit are briefly described. We analyses mainly relations between the focal distance output and the measument accuracy, finding that the measument error distrabution at different focal distance varies with the convex wheel curve of zoom lens.