| 摘要 |
<p>PURPOSE:To stop outputting an audible signal if a human body is detected again by the time when a predetermined period of time passes after the human body was detected and the audible signal was output so as to reduce electric power consumption, and to issue an audible signal immediately when a human body is detected only by setting a changeover switch, or to issue an audible signal only when the human body is again detected when a predetermined period of time passed after the human body was detected. CONSTITUTION:The heat wave detector is equipped with a retriggerable timer circuit 10, a detecting signal processing section 11 that receives a heat wave detecting signal and that outputs an audible signal in the duration when a timer signal is output, a holding circuit section 12 for receiving an audible discriminating signal and for outputting an audible holding signal, an audible circuit 105 for detecting the start time of outputting an audible holding signal and for outputting an audible signal, and a reset circuit section 13 for resetting the holding action of the holding circuit section 12 when the retriggerable timer circuit 10 times up.</p> |
