| 摘要 |
PROBLEM TO BE SOLVED: To provide an anti-theft tag which receives a radio wave from an anti-theft gate and has low directivity. SOLUTION: The anti-theft tag outputs an alarm when a reception circuit including a coil L1 receives a prescribed radio wave, and it detects the attached state to and the detached state from an anti-theft object and outputs an alarm when detecting the detached state. It is provided with a magnetic body 12, which is provided in the vicinity of the winding aperture of the coil L1 in order to cause discontinuous magnetization due to the prescribed radio wave, and a circuit which outputs an alarm on the basis of voltage induced in the coil L1 by discontinuous magnetization of the magnetic body 12.
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