| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an antitheft tag which performs detection without receiving a bad effect from a recording medium and reduces a part that covers a storage case inside as soon as possible. SOLUTION: In an antitheft system which detects the existence of radio wave absorption when a resonant circuit 5 that is attached to a storage case 1 that stores a recording medium such as a CD or to a protective case 2 that covers the case 1 passes through between one gate which includes a sending antenna and the other gate which includes a receiving antenna, an antitheft tag consists of a detection circuit 4 which is located at an outer circumferential edge on at least one side of both sides in the thick direction of the recording medium of the case 1 and detects radio waves and the circuit 5 which is located at a specific one side that crosses one side of the case 1 and also is located close to the circuit 4 or is connected to the circuit 4.</p> |
