| 摘要 |
<p>The present invention relates to an ultrasonic toothbrush using a piezoelectric ultrasonic vibrator. The ultrasonic toothbrush of the present invention comprises a toothbrush body with a predetermined space formed therein, a toothbrush head including one side mounted to an end of the toothbrush body and the other side provided with bristles, a piezoelectric member mounted in the toothbrush body for generating ultrasonic vibration, an ultrasonic vibrator for amplifying the ultrasonic vibration received from the piezoelectric member and transmitting the amplified ultrasonic vibration to the toothbrush head, a power driving unit for supplying electric power to the ultrasonic vibrator, and an acoustic impedance transmission member provided between the toothbrush head and an end of the ultrasonic vibrator brought into contact with the toothbrush head to amplify the ultrasonic vibration. Further, the ultrasonic vibrator of the present invention has a vibration mode depending on nC / (4 xFr(?/4)) = n?/4, where is a wavelength, Fr(?/4) is a resonant frequency, C is a sound speed in a metallic elastic member and n is an odd number. Furthermore, a cross section of a leading end of the ultrasonic vibrator is formed to be elongated in a direction and a cross section of a base end of the ultrasonic vibrator is formed to be elongated in a direction different from the elongation direction of the cross section of the leading end of the ultrasonic vibrator. According to the present invention, the bristles can be replaced more easily and ultrasonic waves generated from the ultrasonic vibrator can also be transmitted to the oral cavity to increase cavitation regions. Thus, there is an advantage in that the cleaning and treating effects for the teeth and gum can be enhanced.</p> |
