发明授权
- 专利标题: Electronic timepiece
- 专利标题(中): 电子钟表
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申请号: US760890申请日: 1977-01-21
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公开(公告)号: US4150536A公开(公告)日: 1979-04-24
- 发明人: Fumio Nakajima , Kenji Yamada , Takayasu Machida , Yasushi Nomura , Minoru Watanabe
- 申请人: Fumio Nakajima , Kenji Yamada , Takayasu Machida , Yasushi Nomura , Minoru Watanabe
- 申请人地址: JPX Tokyo
- 专利权人: Citizen Watch Company Limited
- 当前专利权人: Citizen Watch Company Limited
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX51-8097 19760128; JPX51-36883 19760402
- 主分类号: G04C3/14
- IPC分类号: G04C3/14 ; G04C9/00
摘要:
An electronic timepiece includes a reversible stepping motor to drive rotatable hands to provide a time display. In a first preferred embodiment, the electronic timepiece includes a circuit means to generate alternating current pulses having an increased pulse width or an increased amplitude to drive the stepping motor with an increased driving current during high speed time correction when a manually operable external control member is actuated during time correction. In a second preferred embodiment, the electronic timepiece comprises a clockwise correction switch, a counter-clockwise correction switch and circuit means for generating first and second alternating current pulses of first and second pulse widths at a predetermined frequency higher than normal driving pulses to drive a stepping motor in clockwise and counter-clockwise directions, respectively, to perform clockwise and counter-clockwise corrections when the clockwise and counter-clockwise correction switches are actuated during time corrections, respectively. The pulse width of the second alternating current pulses is selected to be smaller than that of the normal driving pulses.
公开/授权文献
- US6013835A Method and apparatus for preparing purified terephthalic acid 公开/授权日:2000-01-11
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