| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic electric toothbrush capable of obtaining at least prescribed output voltage even if the input voltage is low, and stably supplying such output voltage. SOLUTION: The ultrasonic electric toothbrush comprises a power supply, an ultrasonic vibration generating part with a voltage boosting circuit to boost the input voltage from the power supply to a voltage larger than the input voltage and a stabilization circuit for stabilizing the voltage boosted by the voltage boosting circuit, and a low-frequency vibration generating part. COPYRIGHT: (C)2006,JPO&NCIPI
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