| 摘要 |
PURPOSE:To decide being in a room from the outside of a door by taking a logical sum of output when an indoor side detecting means operates after an outdoor side detecting means detecting the human body passing with the door between operates and output of an infrared rays detecting means provided indoors. CONSTITUTION:Detecting means 6 and 7 which turn on and off when a person passes with the door 5 between are buried in the floor. The infrared ray detecting means 1 which detects the infrared rays 4 radiated from the human body 2 is provided indoors. When the person enters the room, the switches are made on and off in the order from 7 to 6, and when the person goes out, the switches are made on and off in the order from 6 to 7 to output a pulse train of (a),(b). A flip-flop circuit 8 is triggered to output a pulse (c) and further, a flip-flop circuit 9 outputs a pulse (d). On the other hand, the infrared rays detecting means 1 outputs for the time T2 when it detects the infrared rays. A signal processing circuit 10 calculates the logical sum of times T1 and T2 to inform about being in the room. |
