Sonic vibration toothbrush

1. A sonic vibration toothbrush, that uses vibration by a sonic wave, comprising:

a head extending in an axial direction and having a plurality of bristles implanted at an outer circumference thereof in a direction perpendicular to the axial direction;

a head arm having an inner space to transmit the sonic wave to the head and having a truncated cone shape so that the inner space is narrowed from a bottom to a top, wherein a top portion of the head arm where the inner space is narrowed is coupled to the head;

an accommodating portion having a motor therein and coupled to the bottom of the head arm to transmit a sonic wave generated by a rotating force of the motor to the head arm;

a handle formed in a streamlined shape and having a space for accommodating a battery;

an input unit provided at the accommodating portion in a button form;

a display unit provided at the handle and having at least two lamps; and

a control circuit configured to control the motor according to input information provided from the input unit,

wherein the head includes a head body extending in the axial direction and a plurality of washer rings provided around the head body and head body is inserted into the plurality of washer rings,

wherein the head is partially inserted into the head arm and coupled to the head arm, a portion of the head inserted into the head arm has a greater diameter than a portion of the head not inserted into the head arm, and the portion of the head inserted into the head arm and the portion of the head not inserted into the head arm are connected with a slope,

wherein the plurality of washer rings include at least one washer ring at which the plurality of bristles are implanted and at least one washer ring at which no bristle is implanted,

wherein the input unit includes a first input button, and second and third input buttons located at upper and lower sides based on the first input button, wherein the input unit includes fourth and fifth input buttons located at left and right sides based on the first input button, wherein in the user setting mode, when the fourth input button located at the left side of the first input button or the fifth input button located at the right side of the first input button is operated, the rotating speed of the motor is increased or decreased as much as a second unit rotating speed which is different from the first unit rotating speed,

wherein when the first input button is operated, the sonic vibration toothbrush is powered on so that the motor rotates at a predetermined rotating speed, or an operation mode of the sonic vibration toothbrush is shifted to a user setting mode in which a rotating speed of the motor is set, or the sonic vibration toothbrush is powered off,

wherein in the user setting mode, when the second input button located at the upper side of the first input button is operated, the rotating speed of the motor is increased as much as a first unit rotating speed and set to an increased rotating speed, and when the third input button located at the lower side of the first input button is operated, the rotating speed of the motor is decreased as much as the first unit rotating speed and set to a decreased rotating speed,

wherein, when the sonic vibration toothbrush is powered on and after the rotating speed of the motor is set in the user setting mode, the motor rotates at the set rotating speed, and

wherein the bristles implanted at the head have lengths which are longer as being farther from the head arm and shorter as being closer to the head arm.

2. The sonic vibration toothbrush according to claim 1 ,

wherein at least one input button among the second to fifth input buttons includes a piezoelectric sensor which gives different values depending on a magnitude of pressure, and the rotating speed of the motor is adjusted according to the magnitude of input pressure.

3. The sonic vibration toothbrush according to claim 1 ,

wherein when a difference between a current rotating speed of the motor and a rotating speed according to the input information is equal to or greater than a predetermined reference value, the control circuit changes the rotating speed of the motor to a predetermined rotating speed between the current rotating speed and the rotating speed of the input information, keeps the predetermined rotating speed for a predetermined time, and then changes the predetermined rotating speed to the rotating speed of the input information.

4. The sonic vibration toothbrush according to claim 1 ,

wherein the head is made of a transparent material and is surface-coated so that light irradiated from the head arm is transmitted toward a terminal end of the head.

5. The sonic vibration toothbrush according to claim 1 ,

wherein the at least one washer ring at which the plurality of bristles are implanted and the at least one washer ring at which no bristle is implanted are alternately provided around the head body.