长焦距空间相机调焦机构设计

长焦距空间相机容易因环境变化产生离焦现象,引起相机成像质量下降。根据空间相机不同的结构特点和工作环境,需要设计相应的调焦机构。从保证相机成像质量和结构空间要求的角度出发,阐述了调焦机构的工作原理和组成,进行了调焦机构的方案选择,分析了调焦机构误差分布,提出了一种由精密滚珠丝杠和直线轴承实现导向和运动方向转换的调焦机构。对调焦机构进行了力学试验和分析。试验结果表明,调焦机构较强的结构刚度和稳定性能够满足空间相机在复杂环境条件下精确可靠调节调平面位置的要求。

Focusing Mechanism Design for Long Focal Length Space Camera

The focal plane of long focal length space camera is easily changed by changes of environment.An accuracy focusing system for adjusting the offset of the focal plane is provided in this paper.The makeup of focusing system is described,the scheme of focusing system is selected,and the precision distribution of focusing system is analyzed in order to assuring the image quality and meeting the requirements of structure.It is confirmed that the focusing system is mainly made of precision screw ball and linear bearing,which achieves guidance and conversion of movement.The structure stability is tested through mechanical tests.The results show that the focusing system can meet the requirements of space camera,which refer to adjusting the position of the focal plane accurately.