| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass breakage detector for detecting even the opening/closing of a window. SOLUTION: A glass breakage detecting part 1 is constituted of a vibration sensor part 11 which converts the vibration of a glass plate G into a voltage signal, an amplifying part 12 which amplifies the voltage signal, and a vibration analyzing part 13 which compares the amplitude of predetermined frequency components extracted from the amplified voltage signal with a threshold, and outputs a warning signal to a CPU 3 when detecting glass breakage. When the warning signal is inputted, a CPU 3 announces the warning of glass breakage by an output part 4. An opening/closing detecting part 2 is constituted of a magnet M mounted on a vertical frame member 100 of the opening frame of a window and a reed switch 21 which detects the opening/closing of the window by detecting the magnetism of the magnetic M. When the window is closed, the magnet M and the reed switch 21 are made to approach, and face to each other, and the reed switch 21 is turned on. On the contrary, when the window is opened, the reed switch 21 moves far from the magnet M, and the reed switch 21 is turned off. COPYRIGHT: (C)2005,JPO&NCIPI
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