Horology: time measuring systems or devices – Power supply details – Electrical
Patent
1980-07-10
1984-03-20
Reynolds, B. A.
Horology: time measuring systems or devices
Power supply details
Electrical
368157, 368217, 368 66, 340636, 318696, 323299, G04C 300
Patent
active
044377690
ABSTRACT:
An electronic timepiece having a stepping motor includes a power source, an oscillating circuit, a dividing circuit connected to the oscillating circuit, and a wave shaping circuit receptive of a plurality of output signals produced from the dividing circuit to produce a plurality of controlling signals. A controlling circuit receives the controlling signals and controls a driving circuit. The power source is connected to a detecting voltage circuit by which the variation of the supply voltage of the power source is detected, and a normal waveform or an intermittent waveform is selectively applied to the stepping motor according to the variation of the supply voltage. As a result, the power consumption of the steppng motor is controlled at a constant level, even if the supply voltage of the power source is higher than the optimum voltage of the stepping motor and even if the supply voltage varies.
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Mandai Masaaki
Otawa Shuji
Sato Katsuhiko
Shida Masaharu
Ueda Makoto
Adams Bruce L.
Burns Robert E.
Leung Philip H.
Lobato Emmanuel J.
Reynolds B. A.
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