一种大口径连续变焦距系统的结构设计

摘要

A continuous zoom optical system with an aperture of 1m and the focus range of 2000-6000mm is designed, which is based on the technical requirements of a kind of large-aperture optical equipment. An appropriate cam mechanism is selected and is designed specifically by comparing the advantages of the former structure of continuous zoom optical system. The static and dynamical analysis of the cam's structure is presented by using FEM software, which is the key element of the structural system. The precision of this continuous zoom optical system is 3.3μm, which meets the measure requirements.%针对某大口径光电探测设备技术指标设计了一种口径为1 m级,焦距变化范围为2000~6000 mm的大口径、长焦距可见光连续变焦系统.比较了以往的连续变焦结构优缺点,选取了合适的凸轮机构并进行了详细地结构设计.利用有限元软件对连续变焦距系统中的关键结构件凸轮进行了静力学和动力学分析.计算了该种凸轮结构下的连续变焦距系统的精度为3.3μm,满足系统的测量要求.