Electronic article surveillance system incorporating an auxiliar

Details Electronic article surveillance system incorporating an auxiliar Electronic article surveillance system incorporating an auxiliar

1989-12-27

1991-07-09

Swann III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340522, 340541, G08B 1314

Patent

active

050309412

ABSTRACT:
To reduce the occurrence of false alarms, the disclosed system incorporates an auxiliary sensor for detecting the presence of a shopper passing through the electronic article surveillance device, such that the device is operated continuously, and the auxiliary sensor is used to enable external alarms of the device only upon detecting the shopper's presence. Thus, while the device continuously monitors field-induced signals which are received, activation of the external alarm is permitted only when a shopper passes through the security device and is detected by the auxiliary sensor. Sounding of the alarm is then based upon an analysis of the data received at and just prior to the detected approach of the shopper to be monitored, eliminating phantom alarms while significantly reducing false alarms and merchandise-activated alarms.

REFERENCES:
patent: 4682155 (1987-07-01), Shirley
patent: 4684933 (1987-08-01), Dill
patent: 4818973 (1989-04-01), Yamakawa et al.
patent: 4831363 (1989-05-01), Wolf
patent: 4881061 (1989-11-01), Chambers

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