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Deactivateable resonant circuit

A tuning circuit and resonance technology, applied in the direction of circuit, electrical components assembly printed circuit, electrical components, etc., can solve problems such as difficult to form fuses

Inactive Publication Date: 2004-08-04
CHECKPOINT SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this method works quite well, it requires the use of relatively high currents to melt the fuse
Additionally, it is often difficult to consistently and repeatably form such fuses using standard macroetching techniques commonly used to make labels

Method used

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  • Deactivateable resonant circuit
  • Deactivateable resonant circuit
  • Deactivateable resonant circuit

Examples

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Embodiment Construction

[0031]Some technical terms used in the following description are only for convenience of description, rather than a rigid regulation. In these figures, the words "upper", "bottom", "lower", and "upper" refer to the direction of reference. When used with reference to an article or product having a label embedded therein, the terms "use" or "normal use" refer to the use of the article or product during its lifetime, i.e. from the time the product is manufactured until the All care and use of the product during the period it was abandoned. Terminology includes the above mentioned, derivatives and synonyms. The same reference numerals represent the same elements in the drawings.

[0032] This invention relates to resonant circuits for use with electronic article surveillance systems (EAS). The system is designed to sense and detect resonant conditions in the circuit. That is, the circuit is capable of resonating at a frequency within a predetermined frequency range when expose...

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PUM

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Abstract

A resonant tag used with an electronic article surveillance system for detecting the presence of the tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range includes a resonant circuit capable of resonating at a frequency within the predetermined detection frequency range. The resonant circuit includes an inductor formed at least in part on a surface of a dielectric substrate of the tag. The inductor is formed with a discontinuity or gap, causing an electrical open circuit. The open circuit is closed with a fuse secured proximate to the gap and wirebonded to the portions of the inductor proximate to the gap. The fuse is melted by a current greater than a predetermined level flowing therethrough. Such a high current may be induced in the inductor by an external electromagnetic field. Melting of the fuse causes an open circuit condition, which alters the frequency at which the tag resonates.

Description

field of invention [0001] The present invention relates to a tuned circuit and, more particularly, to a tuned security tag whose function can be disarmed. These tuned security tags can be used in conjunction with electronic security and other systems to detect whether items are in unauthorized case of movement. Background technique [0002] Electronic Article Surveillance (EAS) systems for detecting and preventing merchandise or items from retail stores and / or other establishments (such as libraries) being removed from the store or corresponding premises by thieves or unauthorized persons are well known and widely used. use. Typically, these security systems employ a tag or label that is affixed, bonded or otherwise secured to the protected and packaged item or exhibit. Security tags can come in different sizes, shapes, and forms, depending on the particular type of security system being used, the type and size of the item, and the like. In general, such security systems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077G06K19/07G08B13/24H01Q7/00
CPCG08B13/242G08B13/2431G08B13/2442Y10T29/49002Y10T29/49149Y10T29/49107G08B13/187
Inventor 埃里克·艾伦·埃克斯坦劳伦斯·阿帕卢茨加里·托马斯·马祖奇
Owner CHECKPOINT SYST INC