Patent ID: 8418302

Claim:
A motorized toothbrush comprising: a shaft; a tooth brush mounted to a distal end of the shaft; a coil mounted to and surrounding the shaft; a first magnet adjacent to a periphery of the coil; and a second magnet adjacent to the periphery of the coil and on an opposite side of the coil with respect to the first magnet; wherein passing a current through the coil causes the shaft and the coil mounted thereto to rotate alternately clockwise and counterclockwise around the axis of the shaft; wherein the first magnet adjacent to the periphery of the coil is configured to at least partially rotate alternately clockwise and counterclockwise without being coupled to the coil rotation; wherein the second magnet adjacent the periphery of the coil is configured to at least partially rotate alternately clockwise and counterclockwise without being coupled to the coil rotation; the first magnet comprises a first N-S portion nearer the coil and a first S-N portion further away from the coil; the second magnet comprises a second N-S portion nearer the coil and a second S-N portion further away from the coil; wherein the first N-S portion is opposite the second N-S portion; and wherein the first S-N portion is opposite the second S-N portion.