| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ultrasonic device with a single vibration transmission plate, which has modes of two or more ultrasonic waves, and can give vibration in a different frequency. <P>SOLUTION: The ultrasonic device includes: one or more ultrasonic vibration transmission plates, each of which having a backside and a smooth surface for contacting human skin; and at least two different ultrasonic vibration transducers 22, 25 coupled to a backside of each of the ultrasonic vibration plates. Each of the ultrasonic vibration transducers generates an ultrasonic wave with a unique frequency between 20 kHz to 25 MHz. Each of the ultrasonic vibration transducers has a bottom surface paralleling to the smooth surface. A distance between the bottom surface of any of the ultrasonic vibration transducers to the smooth surface is approximately an integer times of the half wavelength of the ultrasonic wave generated by the ultrasonic vibration transducer. <P>COPYRIGHT: (C)2012,JPO&INPIT |
