Electronic timepiece
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United States of America Patent
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Mar 30, 1999
Grant Date -
N/A
app pub date -
Dec 5, 1995
filing date -
Apr 6, 1994
priority date (Note) -
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Abstract
In an electronic timepiece using power supply means consisting of a solar cell and an electric double layer capacitor, whose output voltage varies, as a power supply, a plurality of driving pulse preparation means for preparing driving pulses for driving a stepping motor are arranged. Each driving pulse preparation means prepares a driving pulse group having a combination of pulse widths, which combination is different from that of remaining ones of the driving pulse preparation means. A varying output voltage of the power supply means is detected, and one of the plurality of driving pulse preparation means is selected in accordance with the detected output voltage. A driving pulse for minimizing the current consumption is selected and supplied to the drive circuit of the stepping motor. With this arrangement, the stepping motor can always be driven at a minimum current consumption, and the driving time can be prolonged.
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