An electric toothbrush (26) includes a motor (30) and a mechanical oscillator (32) for driving a brush head assembly (24) at high frequencies. The brush head assembly (24) attaches to the mechanical oscillator (32). A motor (30) drives the brush head assembly (24). Control circuitry (34) senses the frequency of oscillation of the mechanical oscillator (32) and controls the frequency of the power applied to the motor (30) to maintain the mechanical oscillator (32) at resonance under a variety of loads imposed during use.
申请公布号
WO9533419(A1)
申请公布日期
1995.12.14
申请号
WO1995US06898
申请日期
1995.06.05
申请人
TELEDYNE WATER PIK DIVISION OF TELEDYNE INDUSTRIES