Patent ID: 9144476
Filing Date: 2015-09-29
Classification: A46B,A61C,G06K

Abstract:
1. An electric toothbrush comprising: a brush; a motor having a rotational shaft; an eccentric shaft having a first end and a second end, the first end being fixed to the rotation shaft of the motor and the second end being connected to the brush, wherein said brush vibrates in accordance with a rotational speed of the motor; an orientation detector configured to detect an orientation of said brush; a section estimation device configured to estimate a section being brushed based on the detected orientation; and a controller configured to control the rotational speed of the motor such that a vibration frequency of the brush is changed based on a change of the estimated section being brushed, wherein said orientation detector includes an acceleration sensor configured to detect a three-dimensional orientation of said brush based on output of said acceleration sensor.