| 摘要 |
<p>PROBLEM TO BE SOLVED: To extend the life of a stepping motor that scans a warning zone, with respect to a thermal sensor for static detection which can scan a warning zone. SOLUTION: The alarming zone of a static detection sensor 11 is not scanned at all times but is scanned only when it is necessary. For instance, when it is in a warning state and also when only an accident warning audible signal is outputted from a movable detection sensor 10 or a sensor head 12 of the sensor 11, is the scan started. After scan has started, it is stopped when the accident warning audible signal disappears from the sensor 10 or from the head 12 of the sensor 11.</p> |
