| 摘要 |
PROBLEM TO BE SOLVED: To prevent an accident caused by unexpectedly opening a fire door without noticing the existence of another person when a person exists at both sides of the fire door. SOLUTION: A first sensor 10a and a second sensor 10b for detecting the existence of the person facing the door are disposed in a first space 3a, namely the side to which the fire door turns to open, and a second space 3b, namely the other side of the first space 3a. When the first sensor 10a detects a person 4a facing the door 2 in the first space 3a, the alarm 20a disposed in the second space 3b issues an alarm to notify the other person 4b in the second space 3b of the existence of the person 4a. The contrary is possible. Thus, the accident caused by unexpectedly opening the door 2 without noticing the existence of the person on the other side of the door 2 can be prevented.
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