| 摘要 |
PROBLEM TO BE SOLVED: To increase the possibility of using a piezoactive device. SOLUTION: The piezoactive device (50) includes a piezoelectric element (18), and an elastically deformable shell (51) in which the piezoelectric element (18) is disposed. The use of the piezoactive device includes, for supplying power to an electric circuit connected to the piezoelectric element (18), the step of exerting on the piezoactive device (50) punctual mechanical action and then allowing the piezoactive device (50) to resonate freely. The device includes the piezoactive device (50), an electrical circuit connected to the piezoelectric element (18), and a means for exerting the punctual mechanical action. The system includes a device whose electrical circuit can emit electromagnetic waves, and a second device adapted to receive waves emitted by the first device. the system is used for controlling a spotlight, in particular. |
