| 摘要 |
<p>PURPOSE: To attain inexpensive and highly accurate measurement, to make it possible to install an earthquake alarm device regardless of a power supply condition and to minimize the earthquake damages by arranging an oscillation sensor on the center part of a housing and arranging a battery and a sound outputting means around the oscillation sensor. CONSTITUTION: A speaker 35 to be the sound outputting means is loaded on a speaker storing part formed on the upper part of a housing. A constant voltage power supply circuit for converting the voltage of a dry battery 43 into fixed voltage, an electrostatic capacity type acceleration sensor 38 to be an oscillation sensor for detecting horizontal oscillation, an oscillation circuit for extracting an output from the sensor 38 as a change in oscillation frequency, a sound synthesizing circuit for synthesizing a sound to be outputted at the occurance of earthquake or the like, and an emergency lamp 44 to be an emergency lighting means are mounted on a board 36. Consequently a compact earthequake alarm device can be obtained.</p> |
