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    • 9. 发明授权
    • Electronic watch
    • 电子手表
    • US08841875B2
    • 2014-09-23
    • US13500829
    • 2010-10-06
    • Yu TakyoToshiaki FukushimaAkira ShiotaToshinari MaedaNobuaki Suzuki
    • Yu TakyoToshiaki FukushimaAkira ShiotaToshinari MaedaNobuaki Suzuki
    • H02P8/00G04C3/14H02P8/02
    • G04C3/143H02P8/02
    • Provided is an electronic watch capable of, even if an indicating hand having a large moment of inertia is used, accurately determining success and failure of rotation. The electronic watch detects rotation by using a first detection mode determination circuit (12) and a second detection mode determination circuit (13). In the electronic watch, a timing counter (14) for measuring a time after an output of a normal drive pulse is followed by a detection pulse selection circuit (151) provided as changing means for changing a width or a frequency of a detection pulse in accordance with an output time of the detection pulse. The detection pulse detects the rotation and simultaneously serves as an electromagnetic brake for a rotor (10). The electromagnetic brake for the rotor (10) is controlled by changing the width or the frequency of the detection pulse in a predetermined period, thereby achieving an accurate rotation detection. Alternatively, the setting of the width or the frequency of the detection pulse may be changed in accordance with a determination result in a first detection mode, an output voltage of a power supply, and a driving power of the normal drive pulse, instead of the output timing of the detection pulse.
    • 提供一种能够即使具有大惯性矩的指示手也能够精确地确定旋转成功和失败的电子手表。 电子表通过使用第一检测模式确定电路(12)和第二检测模式确定电路(13)检测旋转。 在电子表中,用于测量正常驱动脉冲输出之后的时间的定时计数器(14)后面是检测脉冲选择电路(151),该检测脉冲选择电路(151)被设置为改变装置,用于改变检测脉冲的宽度或频率 根据检测脉冲的输出时间。 检测脉冲检测旋转,同时用作转子(10)的电磁制动器。 用于转子(10)的电磁制动器通过在预定时间段内改变检测脉冲的宽度或频率来控制,从而实现精确的旋转检测。 或者,可以根据第一检测模式,电源的输出电压和正常驱动脉冲的驱动功率的确定结果来改变检测脉冲的宽度或频率的设置,而不是 检测脉冲的输出定时。