摘要
采用双电机联动控制变倍组与补偿组的变焦方案替代传统的曲线套筒,实现了采用全透射式结构型式,相对口径为1/4,焦距变化范围为342.76mm^13.15mm连续变焦光学镜头的机械补偿式变焦。将变倍组设计成步进模式,作匀速运动,补偿组设计成位置跟踪模式,按凸轮曲线作变速运动,采用双电机全数字伺服控制凸轮(CAM)算法,将光学设计计算的变倍镜和补偿镜位置对应关系转变为对应的脉冲数输入到CAM表中,从而确定2个不同运动速度轴之间的位置对应关系。试验结果表明:双电机控制的变倍组和补偿组位置分辨率达到0.18μm,光轴一致性水平方向达到1.9′,垂直方向达到1.3′。
A varifocal method by using double-motor to control the zooming lens and the com- pensating lens instead of cam-curve muff was described, and a mechanical compensated zoom lens with focal length range of 342.76 mm-13.15 mm and relative aperture of 1/4 was also presented. The zooming lens was moved step-by-step and the compensating lens was moved following the zooming lens by position tracking method （CAMIMG）, so that the lenses were positioned accurately in the whole zooming range. The pulse data corresponding to the posi- tions relationship of zooming lens and compensating lens was stored in the CAM table accord- ing to optical design cam datum by digital serve control cam arithmetic, therefore the relation- ship of the two different movement velocity axes in each position was determined. The results show that the image is clear and steady in the whole varifocal range, the position resolution of zooming lens and compensating lens is 0. 18 μm, the optical axis consistency is about 1.9＇ in horizontal direction and 1.3＇ in vertical direction.
出处
《应用光学》
CAS
CSCD
北大核心
2013年第5期754-757,共4页
Journal of Applied Optics
关键词
红外连续变焦
双电机控制
变倍组
补偿组
步进模式
位置跟踪模式
infrared zoom lens
double-motor control
zooming lens group
compensating lensgroup
stepping mode
position tracking model
