| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a fall alarm device, to reduce the weight thereof by using a piezoelectric speaker, and to improve the convenience by restricting the power consumption. SOLUTION: In this fall alarm device 10, when the piezoelectric speaker 1 is mechanically deflected by the impact when a key is dropped, this deflection is converted to the electric signal by a piezoelectric element to generate the trigger pulse. A power source switching circuit 3 is turned on, and voltage of a battery 5 is impressed to an alarm circuit 4 and a switching circuit 2, and the piezoelectric speaker 1 converts the electric signal input from the alarm circuit 4 to the sound, and outputs it.
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