| 摘要 |
<p>PURPOSE:To improve burglar preventive performance where alarm bells are sounded over based on the output from an impact sensor detecting vibration caused by destructive actions against an automobile by enabling sensitivity against impact detection to be changed in accordance with day-time, night-time, more crowded places, less crowded places and the like. CONSTITUTION:Where an alarm unit 37 is actuated upon detecting destructive (burglar) actions against an automobile by a microcomputer 34 based on the output from an impact sensor 10, a time setting device 26 which sets the time for either day or night, is provided. The output from said time setting device 26 is inputted into an operating section 25 for inputting the output on the time from the operating section 25 into a timer setting memory 22 whereby its output is compared with the output from the timer adder 20 by a comparator 36, thereby actuating a sensitivity setting memory 21. And an alarm output level setting memory 24 is provided for comparing its output with the output from the operating section 25 by a comparator 23 so as to control a switching circuit 35, thereby actuating the alarm unit 37.</p> |
