| 摘要 |
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 piezoelectric 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 piezoelectric actuator, and the accelerometer to execute a program stored in the memory to monitor signals from the accelerometer and, if a fall is detected based on the signals from the accelerometer, apply a negative voltage to the piezoelectric actuator causing reverse bending of the piezoelectric actuator to permit the stopping arrangement to limit movement of the touch-sensitive input assembly and thereby limit force exerted on the piezoelectric actuator between the touch-sensitive input assembly and the base.
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