Electric toothbrush and design method thereof

Abstract

An electric toothbrush comprises a support frame, a drive frame, and a motor. The support frame is provided with a hollow part. The drive frame is elastically connected to the support frame through an elastic arm. The drive frame is positioned in the hollow part. The drive frame is spaced apart from the support frame. An upper end of the drive frame has a drive shaft connector configured to be connected to a toothbrush head. The motor is arranged in the drive frame. An output shaft of the motor is connected with a vibrating hammer. The motor is rotatable to drive the drive frame to swing or vibrate relative to the support frame so that the drive shaft connector can drive the toothbrush head to swing or vibrate. The elastic arm has an effective length calculated by: L s = √ 3 E ⁢ b ⁢ h 3 2 ⁢ k , where E denotes a flexural modulus of the elastic arm, b denotes a width of a cross section of the elastic arm, h denotes a height of the cross section of the elastic arm, and k denotes a total stiffness coefficient of the elastic arm.

Dependencies are inferred from the claim text.