为保证焦面长度大于600 mm 的大视场空间光学遥感器在空间环境下的成像质量, 设计了一套在±2 mm调焦范围内焦面组件倾斜小于7″、定位精度优于0.01 mm的焦面调焦机构。针对系统对调焦精度、力学环境、真空环境的要求, 该调焦机构采用双凸轮驱动技术来满足调焦精度要求; 采用失电制动器自锁技术, 使相机经发射等力学环境冲击后像面位置仍保持稳定。此外, 采用高刚度导轨和轴承使调焦机构具有较高的动态刚度。设计分析及实验证明, 该套焦面调焦机构具有较高的调焦精度和可靠性, 能够在复杂的空间环境下完成调焦任务, 提高遥感器的成像质量。

A focusing mechanism with a tilt of focusing plane assembly less than 7 ", positioning accuracy better than 0.01 mm in the ±2 mm focusing range was designed to ensure the best image quality for a wide field space camera with a focal plane length more than 600 mm. To meet the requirements of the focusing mechanism for focusing accuracy, mechanical environments and the vacuum environments, the dual-cam drive technology was used to complete the accurate focusing, and the loss of power brake self-locking technology allowed the camera to be a stable image plane position under the impact of mechanical environments. Furthermore, the high stiffness rail and bearings were used in the focusing mechanism to obtain a high dynamic stiffness. The design analysis and experimental results show that the dual focal plane cam-driven focusing mechanism has high focusing precision and high reliability and is able to complete the focuing and improve the image quality of space cameras in the complex space environments.