| 摘要 |
A system for preventing shoplifting of articles through a first exit area having an article removal detector positioned therein. A small capsule bearing the designation DON'T REMOVE ELECTRONIC ALARM is attached to an article to be protected, such as a dress, by means of a safety pin. The capsule includes a wristwatch battery which powers a single-stage, solid state oscillator which generates an RF signal having a frequency F1 when the safety pin is closed. A shoplifter who passes through the exit area with the dress having the capsule fastened thereto will actuate an article removal detector which will in turn actuate a pair of flash cameras which are positioned to effectively photograph the entire exit area. If the shoplifter unfastens the safety pin in the process of discarding the radiating capsule within the store in an attempt to thwart the system, a capsule removal detector will immediately actuate a flash camera or annunciator to indicate unauthorized removal of the capsule. Upon payment of the dress, the cashier removes the capsule and very briefly causes an inhibit signal to be transmitted to the capsule removal detector to prevent activation of the capsule removal alarm devices during authorized removal of the capsule. Another detector may be utilized at the cashier's counter to detect secreted items bearing the capsule.
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