| 摘要 |
PROBLEM TO BE SOLVED: To provide an anti-theft device small in size, low in cost and capable of generating an alarm at the time of being applied with a strong impact, in the anti-theft device to be used for an anti-theft support system for preventing shoplifting of commodities, etc. SOLUTION: In this anti-theft device 11, a piezoelectric buzzer 37 is used as an alarming means 15 and a receiving coil 31 is connected in series to the piezoelectric buzzer 37. Thus, an electric signal induced by an impact to the piezoelectric buzzer 37 is inputted to a detecting means 13 via a receiving means 12, the impact from the outside is detected and the alarm is generated from the piezoelectric buzzer 37 via an alarm driving means 14. |
