Patent ID: 7921496

Claim:
An electric toothbrush comprising: a motor having a rotating shaft; a case in which the motor is located; at least two toothbrush handles located in the case for rotating and having brushes at tips of the at least two toothbrush handles; a power transmitter located in the case between the motor and the at least two toothbrush handles and rotating the at least two toothbrush handles; and a vibration generator located in the case, between the motor and the at least two toothbrush handles, and reciprocating the at least two toothbrush handles, wherein the vibration generator includes an eccentric cam power transmitter which comprises first and second eccentric cam housings supporting the tips of the at least two toothbrush handles, first and second eccentric cams coupled to the first and second eccentric cam housings and located on a driven shaft, an eccentric cam driven gear located on the driven shaft between the first and second eccentric cam housings and having a tooth portion at a side surface, and an eccentric cam drive gear located on the rotating shaft of the motor.