Title:
DEACTIVATABLE RADIO FREQUENCY SECURITY LABEL
Document Type and Number:
WIPO Patent Application WO2004023416
Kind Code:
A3
Abstract:
A deactivation apparatus for an electronic article surveillance tag having a plurality of layers and an equivalent resonant circuit containing an inductor and a capacitor is provided. The apparatus includes: a capacitor formed by a pair of conductive capacitor plates separated apart by a dielectric layer; an inductor connected to each of the pair of capacitor plates where an electromagnetic field of a preselected frequency at a first magnitude impinging upon the tag causes the equivalent resonant circuit to resonate and produce a detectable response from the tag; and, an electrically weakened area in the dielectric layer between the pair of conductive capacitor plates where the electromagnetic field at a second magnitude higher than the first magnitude impinging upon the tag causes a conductive path through the weakened area electrically connecting the pair of capacitor plates together and deactivating the tag.
Inventors:
NARLOW DOUGLAS A
PATTERSON HUBERT A
PATTERSON HUBERT A
Application Number:
PCT/US2003/027865
Publication Date:
November 25, 2004
Filing Date:
September 05, 2003
Export Citation:
Assignee:
SENSORMATIC ELECTRONICS CORP (US)
International Classes:
G08B13/24; (IPC1-7): G08B13/14
Foreign References:
| US4567473A | 1986-01-28 | |||
| US4682154A | 1987-07-21 | |||
| US6091607A | 2000-07-18 | |||
| US6480110B2 | 2002-11-12 |
Other References:
See also references of EP 1540614A4
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