Importance

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Abstract

A power-driven toothbrush comprising a brush head 1 mounted on a brush handle 2 for vibratory movement relative thereto, a vibration transmitting arm 33 extending between said handle 2 and said head 1 and a vibration actuator 3 located within the handle 2, said vibration transmitting arm 33 including a magnet 34 located within said handle 2 and the actuator 2 including a solenoid 32 adjacent said magnet 34 and means for supplying AC current to the solenoid 32 a frequency which is the same as the resonant frequency of the vibration transmitting arm 33. The means for supplying AC current to said solenoid includes a printed circuit board 31. The frequency of the AC current delivered to the solenoid and the natural frequency of the vibration transmitting arm are in the range of 100-300 Hz.

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First Claim