微光多谱段成像仪调焦及像移补偿机构设计与性能分析

根据某型号微光多谱段成像仪的整机结构特性和工作条件，设计了一种调焦及像移补偿一体化的设备，达到节约空间、保证成像质量以及实现低照度环境下成像的目的。其中调焦功能由丝杠螺母配合楔形滑块实现，像移补偿功能由音圈电机实现，且配合有动、静态两级锁紧装置，使机构的可靠性、抗冲击性显著提高。结构外形尺寸为349 mm×192 mm×174 mm，调焦范围为±2 mm，像移补偿量为3 mm，调焦分辨率为0.05 μm，实测的定位精度为±5.7 μm。扫频振动试验得出其一阶模态为225 Hz，与有限元仿真分析结果基本一致，正弦振动试验和随机振动试验结果良好，均在技术指标要求范围内，说明具有良好的动态刚度，可以有效地避免共振现象的发生。综上所述，该调焦及像移补偿机构具有体积小，结构强度高的特点，可以很好地满足微光相机的工作条件。

Design and Performance Analysis of Focusing and Image Motion Compensation Mechanism for Low Light Level Multispectral Imager

According to the structural characteristics and working conditions of a low light level multispectral imager, an integrated device of focusing and image motion compensation is designed to be smaller, better imaging quality and low illumination imaging. The focusing function is realized by the screw nut and the wedge slider. The realization of the motion compensation function depends on the voice coil motor, and with the dynamic and static two-stage locking device. The reliability and impact resistance of the mechanism are significantly improved. The overall dimension of the structure is 349 mm×192 mm×174 mm, the focusing range is ±2 mm, the image motion compensation is 3 mm, the focusing resolution is 0.05 μm, and the actual positioning accuracy is ±5.7 μm. The first order mode is 225 Hz, which is consistent with the result of finite element simulation. The results of the sine vibration test and random vibration test meet the requirements of the technical indicators. It shows that it has good dynamic stiffness and can effectively avoid the resonance phenomenon. The focusing and image motion compensation mechanism has small size and high structural strength, which meet the working conditions of low light level cameras.