摘要 |
PROBLEM TO BE SOLVED: To provide a security door device capable of changing capacitance when one comes close to or is in contact with a security door, and issuing an alarm when the capacitance reaches more than a predetermined capacitance value. SOLUTION: The security door device 1 includes the security door 6 having conductive layers 4 on both surfaces of a resin layer 3 having an electric insulating property, and a cover material 5 having the electric insulating property laminated and fixed so as to be in contact with each of the conductive layers 4, a terminal 8 which is linked to each of the conductive layers 4 of the security door and is connected to a capacitance detector 7. The capacitance is changed when the one comes close to or is in contact with the security door 6, and an alarm signal is transmitted when the capacitance reaches more than the predetermined capacitance value. Thereby an intruder is prevented.
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