发明名称 |
Deactivatable radio frequency security label |
摘要 |
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.
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申请公布号 |
US2004046665(A1) |
申请公布日期 |
2004.03.11 |
申请号 |
US20020236809 |
申请日期 |
2002.09.06 |
申请人 |
NARLOW DOUGLAS;PATTERSON HUBERT A. |
发明人 |
NARLOW DOUGLAS;PATTERSON HUBERT A. |
分类号 |
G08B13/24;(IPC1-7):G08B13/14 |
主分类号 |
G08B13/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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