发明授权
- 专利标题: Electronic watch
- 专利标题(中): 电子手表
-
申请号: US919611申请日: 1978-06-27
-
公开(公告)号: US4274150A公开(公告)日: 1981-06-16
- 发明人: Masataka Ikenishi , Joichi Miyazaki , Shozo Kushida , Hiromasa Nakanishi , Makoto Ueda , Masaharu Shida
- 申请人: Masataka Ikenishi , Joichi Miyazaki , Shozo Kushida , Hiromasa Nakanishi , Makoto Ueda , Masaharu Shida
- 申请人地址: JPX Tokyo
- 专利权人: Kabushiki Kaisha Daini Seikosha
- 当前专利权人: Kabushiki Kaisha Daini Seikosha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX52/77314 19770628
- 主分类号: G04C3/14
- IPC分类号: G04C3/14 ; G04C9/00 ; G04C9/04 ; G04C9/08 ; H02P8/02 ; G04B17/12
摘要:
An electronic timepiece having a stepping motor and a drive circuit responsive to a control signal for applying electrical drive pulses having polarities determined by the control signal for rotating the rotor of the stepping motor. The control circuit normally operates in a mode for applying a control signal to the drive circuit effective to control the drive circuit to apply alternate polarity electrical drive pulses to rotate the stepping motor rotor in a normal direction. Resetting circuitry is operable for correcting the time kept by the timepiece. A detecting circuit detects whether the stepping motor rotor is in a position to be rotated by a forthcoming drive pulse after resetting. If the stepping motor rotor is not in a position for rotation a detection circuit signal is applied to the control circuit so that the control signal controls the drive circuit to apply an electrical pulse effective to rotate the stepping motor rotor after resetting. Consequently, after resetting the immediately forthcoming drive pulse will have a polarity effective to rotate the stepping motor rotor and no time will be lost.
公开/授权文献
信息查询