Solar-powered electronic timepiece
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United States of America Patent
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Apr 28, 2015
Grant Date -
Jun 6, 2013
app pub date -
Nov 29, 2012
filing date -
Dec 5, 2011
priority date (Note) -
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Abstract
The solar battery includes a plurality of cells having a same electromotive force with each other. The display device further includes a display means to display time, and a control means to control operation of the display means. The electromotive force of the solar battery is lower than a deterioration-start voltage of the rechargeable battery. The electromotive force of the cells is higher than a lower-limit driving voltage of the display device, in which a number of such cells equals a total number of cells include in the solar battery minus one. A driving voltage of the display means is lower than the aforementioned lower-limit driving voltage, and an operational voltage of the control means is lower than the aforementioned lower-limit driving voltage.
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