| 摘要 |
PROBLEM TO BE SOLVED: To provide a security system, which can be easily attached to a lock installed part such as inside knob of a door. SOLUTION: A probe 20 is hooked on a doorknob provided with a lock from the inside of room and a casing 2 is hung on the inside doorknob. An antenna 22 is located while being insulated. When a person approaches the door outside the door, an approach sensing signal is outputted by an oscillation circuit 10. When the person touches the doorknob, a touch sensing signal is outputted by a touch sensor detecting circuit 4 and a control circuit 8 recognizes the approach of the person and the touch to the doorknob. When the person touches the doorknob, the control circuit outputs a low-volume alarm tone signal to a sounding part 16 and when the approach of the person to the door and the touch of the person to the doorknob are recognized, an internal timer circuit measures time. After the lapse of set time, the control circuit outputs a high-volume alarm tone signal after the continued output of the touch sensing signal from the touch sensor detecting circuit 4 is confirmed.
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