| 摘要 |
An electronic timepiece having a liquid crystal display device and a buzzer comprised of a piezoelectric element. A voltage booster circuit comprised of a capacitor and a semiconductor switching element boosts the voltage of the voltage supply, and the boosted voltage is applied to drive the liquid crystal display device. A buzzer driving circuit inverts the booster voltage and simultaneously applies the booster voltage and the inverted booster voltage to drive the piezoelectric buzzer element. The operating frequency of the voltage booster is increased when the buzzer is operated and when the booster voltage and inverted booster voltage are applied to energize the piezoelectric buzzer element.
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