| 摘要 |
The invention relates to a system and method for generating ultrasonic waves, in particular for cosmetic and therapeutic treatment, comprising an electrically controlled ultrasonic head that generates the ultrasonic waves having at least two different frequencies f1, f2 . A control unit switches between the at least two predetermined frequency values f1, f2 permanently or at least during predetermined periods of time. The invention is characterised in that after switching to the frequency f1, ultrasonic waves having said frequency are generated for a period of time T1 and after switching to the frequency f2 ultrasonic waves having said frequency are generated for a period of time T2 that is different to T1. The period of time allocated to the higher frequency is longer than the period of time allocated to the lower frequency. |
