公开(公告)号：US3622850A

公开(公告)日：1971-11-23

申请号：US3622850D

申请日：1969-10-22

申请人： SHINJI NUNOKAWA ,  NORIO TABUCHI ,  TATSUO SHIMADA

发明人： NUNOKAWA SHINJI ,  TABUCHI NORIO ,  SHIMADA TATSUO

IPC分类号： G04C3/10 ,  H02K33/10

CPC分类号： G04C3/108

摘要： A constant frequency electromagnetic driving device, for example for a time piece, comprises an electromechanical transducer having a coil electromagnetically coupled to a movable mechanical element and serving both pickup and driving functions to convert mechanical movement of the movable element into an electrical signal and also to convert an electrical signal into mechanical movement of the moving element. An electric circuit shifts the phase of the electrical signal generated by movement of the moving element, amplifies the phase-shifted signal and feeds it back to the coil to drive the moving element.