| 摘要 |
<p>A portable electronic device includes a housing with a base. A touch-sensitive input assembly is spaced from and moveable relative to the base and a stopping arrangement limits movement of the touch-sensitive input assembly in the direction of the base. An actuating arrangement including a piezo disk actuator is disposed between the touch-sensitive input assembly and the base for selectively receiving an applied voltage to thereby apply a force to the touch-sensitive input assembly. An accelerometer and functional components are housed within the housing. The functional components include a memory and a processor operably connected to the memory, the touch-sensitive input assembly, the piezo disk actuator, and the accelerometer for executing a program stored in the memory for monitoring signals from the accelerometer and, if a fall is detected based on the signals from the accelerometer, applying a negative voltage to the piezo disk actuator causing reverse bending of the piezo disk actuator to permit the stopping arrangement to limit movement of the touch-sensitive input assembly and thereby limit force exerted on the piezo disk actuator between the touch-sensitive input assembly and the base.</p> |
