Miniature magnetomechanical marker for electronic article surveillance system
US7075440B2 · kind B2 · utility
21Cited by
17References
24Claims
0Family size
Inventors
Key dates
| Filing date | Feb 26, 2004 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Feb 26, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2408
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A miniature magnetic article surveillance system marker is adapted, when armed, to resonate at a frequency provided by an incident magnetic field applied within an interrogation zone. The marker comprises a magnetomechanical element having at least one elongated ductile strip of magnetostrictive ferromagnetic material disposed adjacent to a ferromagnetic element which, upon being magnetized, magnetically biases the strip and arms it to resonate at said frequency. A substantial change in effective magnetic permeability of the marker at the resonant frequency provides the marker with signal identity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.