Electrostatic tag for use in an EAS system

Details Electrostatic tag for use in an EAS system Electrostatic tag for use in an EAS system

1990-11-29

1992-03-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

G08B 1322

Patent

active

050992252

ABSTRACT:
An electrostatic tag formed from an antenna and a capacitor is disclosed. The capacitor has a charge which changes from a first charge value to a second charge value when the voltage across the capacitor reaches a first threshold value and from the second charge value to the first charge value when the voltage reaches a second threshold value. The capacitor has a dielectric which changes from a first to second dielectric value and from the second to first dielectric value at the first and second voltage thresholds. The capacitor plates also are extended beyond the dielectric to form the antenna of the tag. The tag is used in an electronic article surveillance system which generates an electrostatic field which causes one or the other of the threshold voltages to be exceeded when a tag is exposed to the field. This results in a charge change in the capacitor and a detectable electrostatic pulse is generated.

REFERENCES:
patent: 3754226 (1973-08-01), Fearon
patent: 4206453 (1980-06-01), Williamson
patent: 4212002 (1980-07-01), Williamson
patent: 4660025 (1987-04-01), Humphrey

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