Alarm-equipped electronic article surveillance system

Details Alarm-equipped electronic article surveillance system Alarm-equipped electronic article surveillance system

1996-04-04

1998-09-15

Lefkowitz, Edward

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1314

Patent

active

058085483

ABSTRACT:
An alarm-equipped electronic article surveillance system which is easy to handle, which provides against the triggering of false alarm, and which reliably surveys articles of interest against theft. The system comprises a signal transmitter device located close to the gates of access to an area of interest, and a plurality of tags each attached to an article of merchandise under surveillance. The signal transmitter device includes a signal generator for generating a modulated signal by modulating a carrier frequency signal with a modulation signal, a signal transmitter for transmitting the modulated signal, and a transmitting antenna. The plurality of tags each include a receiving antenna, a signal receiver for selectively receiving the modulated signal, a frequency selector for selecting the modulation signal out of the modulated signal, an alarm generator operable for generating an output indicative of an alarm condition, and an alarm negator for negating the operation of the alarm generator.

REFERENCES:
patent: 4573042 (1986-02-01), Boyd et al.
patent: 5187354 (1993-02-01), Bengtsson
patent: 5245317 (1993-09-01), Chidley et al.
patent: 5589819 (1996-12-01), Takeda

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