离轴三反测绘相机调焦机构的设计  

Design of focusing mechanism for off-axis TMA mapping cameras

作　　者：邵明东[1] 郭疆[1] 孙继明[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《中国光学》2012年第4期373-379,共7页Chinese Optics

基　　金：国家自然科学基金资助项目(No.60507003)

摘　　要：针对测绘相机对相机成像质量和内方位元素稳定性的要求,在分析3种调焦方式特点的基础上,确定了符合离轴三反测绘相机需要的调焦方式。设计了滚珠丝杠驱动的直线导轨式调焦机构,计算得到调焦机构的灵敏度为0.2μm。对该调焦机构进行了精度检测和试验验证,结果显示其指向精度<2″,定位精度<3μm。得到的结果表明:该空间调焦机构具有结构紧凑、刚度高、位移精度好等特点,能够满足离轴三反测绘相机的调焦要求。Based on the requirements of mapping cameras for imaging quality and the stability of inner orientation elements,the characteristics of three focusing strategies are analyzed in detail,and the strategy which is most suitable for the mapping cameras is confirmed.A ball screw driving linear-guide-type focusing mechanism is designed,and its focusing sensitivity is calculated to be 0.2 μm.Precision testing and test validation are performed,which shows that the pointing accuracy of the focusing mechanism is superior to 2″ and the positioning accuracy of the focusing mechanism is better than 3 μm.Test results demonstrate that the designed focusing mechanism has the characteristics of compact structure,high stiffness and high displacement precision and it can meet the focusing requirements of off-axis TMA mapping cameras.

关 键 词：离轴三反测绘相机 调焦机构 调焦精度 光学设计 

分 类 号：V245.6[航空宇航科学与技术—飞行器设计] TH703[机械工程—仪器科学与技术]