Electronic article-surveillance apparatus and method of operatin

Details Electronic article-surveillance apparatus and method of operatin Electronic article-surveillance apparatus and method of operatin

1996-08-22

1998-03-17

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340551, 340552, G08B 1314

Patent

active

057292027

ABSTRACT:
In order to detect the presence of a marker, an electronic article-surveillance apparatus includes a transmitting circuit coupled to a transmit antenna, a receiving antenna juxtaposed with respect to the transmit antenna, such that an electromagnetic signal is generated within a controlled area, the signal being received by the receiving antenna, such that when the marker is located within the controlled area, a disturbance is created in said electromagnetic signal and is picked up by the receiving antenna. The disturbance is the marker signal. An electronics module receives the electromagnetic signal picked up by the receiving antenna, and a feedback conduit, linking the electronics module with the transmitting circuit, can provide to the electronics module an input to the transmitting circuit which controls the amplitude of the electromagnetic signal so as to maintain the marker signal at a substantially constant amplitude and shape. A detection module receives the marker signal and can analyze the marker signal in accordance with predetermined criteria. An alarm circuit is actuated by the detection module when the latter confirms the presence of the marker signal in accordance with the predetermined criteria.

REFERENCES:
patent: 3810147 (1974-05-01), Lichtblau
patent: 3838409 (1974-09-01), Minasy et al.
patent: 4139844 (1979-02-01), Reeder
patent: 4274089 (1981-06-01), Giles
patent: 4309697 (1982-01-01), Weaver
patent: 4531117 (1985-07-01), Nourse et al.
patent: 4622542 (1986-11-01), Weaver
patent: 4622543 (1986-11-01), Anderson
patent: 5353010 (1994-10-01), Sanetra

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