公开(公告)号：EP3203329A1

公开(公告)日：2017-08-09

申请号：EP15847697.8

申请日：2015-09-29

申请人： Citizen Holdings Co., Ltd.

发明人： IRI, Daisuke ,  TAKYOH, Yu

IPC分类号： G04C3/14 ,  H02P8/02

CPC分类号： G04C3/14 ,  G04C3/143 ,  H02P8/02

摘要： Anelectronicwatch (1) includes: a step motor (30) ; a driving pulse generator circuit (5) configured to output a driving pulse (SP) for driving the step motor; a detection pulse generator circuit (10) configured to output a detection pulse for detecting rotation of the step motor; a correction pulse generator circuit (6) configured to output a correction pulse (FP) ; a pulse selection circuit (7) configured to select and output the driving pulse, the detection pulse, and the correction pulse (FP); a driver circuit (20) configured to supply to the step motor the outputs from the pulse selection circuit (7); and a rotation detection circuit (40) configured to receive a detection signal generated by the detection pulse (CP) to judge rotation of the step motor. The electronic watch (1) further includes a driving interval switch circuit (4) configured to switch a driving interval of the driving pulse (SP) between a normal driving interval and a high-speed driving interval. The rotation detection circuit (40) is capable of changing a detection condition by the driving interval switch circuit (4).