【摘要】 提高立体测绘相机地面像元分辨率和地面目标的定位精度,相机需设计调焦环节用以补偿CCD靶面的离焦量。本文根据立体测绘相机光学结构的特点以及相机的焦深,设计了一种基于凸轮导向的调焦机构。在设计中采用了可靠性设计和消空回措施,以保证结构的强度和刚度以及调焦精度。对传动误差的分析及精度验证试验表明:该调焦机构的传动误差为±1.71μm;CCD靶面的直线性精度在X方向为11.2″、Y方向为11.8″;在调焦行程内CCD靶面绕光轴旋转4.7″,满足用户提出的精度要求。更多还原

【Abstract】 In order to improve the ground pixel resolution and positioning accuracy of ground targets,the focusing control systems should be designed to compensate the defocusing of the CCD plane in a tridimentional mapping camera.According to the optical structure and focal depth of the camera,a focusing mechanism based on a cam is designed,and focusing schemes and focusing quantity are confirmed.Moreover,the reliability design and a removing return stroke error method is used to guarantee the strength and rigidity of the mechemism and to improve the focusing accuracy.Analysis of transmission error and validated tests indicate that the error of this focusing mechanism is ±1.71 μm;linearity of CCD plane is 11.2″ in the X direction and 11.8″ in the Y direction;and the circumaxis angle of CCD plane is 4.7″.The result of precision analysis shows that the focusing mechanism can meet the requirements of the users.更多还原