两档变焦距电视用摆动式镜组切换机构设计  

Design of swing type switching mechanism for focusing lens group in visible light television system with double focal lengths

作　　者：徐新行[1,2] 张飞 夏文波[4] Xu Xinhang;Zhang Fei;Xia Wenbo(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;University of Chinese Academy of Sciences ,Beijing 100049, China;Xuchang College of Vocational Technology, Xuehang 461000, China;GE （China） Research and Development Center Co. ,Ltd. ,Shanghai 201203, China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院大学,北京100049 [3]许昌职业技术学院,许昌461000 [4]通用电气(中国)研究开发中心有限公司,上海201203

出　　处：《仪器仪表学报》2018年第1期84-91,共8页Chinese Journal of Scientific Instrument

基　　金：中国科学院前沿科学重点研究计划(QYZDB-SSW-SLH014)项目资助

摘　　要：为了实现可见光电视的两档变焦,设计了一款高重复精度、小体积的镜组切换机构。首先根据可见光电视的光学设计结果和功能需求,提出了摆动式镜组切换机构的主要技术指标;然后,根据此指标开展了镜组支撑板、步进电机和伺服控制系统的详细设计或选择;在完成镜组切换机构和可见光电视的精密加工、装调后,对切换机构的切换时间、重复精度及可见光电视在两种焦距状态下的成像效果进行了实验检测与验证。结果表明,采用步进电机驱动、齿轮传动增扭、光电开关反馈、机械停挡精确定位、弹簧拉力保持等手段研制的镜组切换机构,不仅外形尺寸小（128 mm×140 mm×135 mm）、切换时间短（0.9 s）、重复精度高（方位、俯仰均不超过20″）,而且在可见光电视系统中的应用效果良好,为高性能、低成本变焦距电视的研制提供了一种新选择。To realize the focusing of visible light television system with double focal lengths,a swing type switching mechanism for focusing lens group with high repeatability precision and small volume is designed.Firstly,the main specifications of the switching mechanism for focusing lens group are put forward on the basis of optical system design result and function requirements of visible light television.Then,according to the specifications,the support plate for the focusing lens groups,step motor and servo control system are designed or chosen in detail.After completing the fine manufacturing,assembling and adjusting of the switching mechanism for focusing lens group and visible light television system,the switching time,repeatability precision of the switching mechanism and the imaging effect of the visible light television in two focal lengths are tested and verified,respectively.The results show that the switching mechanism for focusing lens group developed by adopting step motor driven,gear transmission torque increasing,photoelectric switch feedback,mechanical stopping precise positioning,spring tension maintaining and etc.has the advantages of small outline dimension（128 mm × 140 mm × 135 mm）,short switching time（0.9 s）,high repeatability precision（azimuth and pitch angles less than 20″）.The switching mechanism for focusing lens group has excellent application effect in visible light television system,which provides a new choice for the switching lens group in the development of high performance,low cost visible light television system with variable focal length.

关 键 词：可见光电视 调焦 摆动式 切换机构 重复精度 

分 类 号：TH703[机械工程—仪器科学与技术] TG502.33[机械工程—精密仪器及机械]