EAS marker with flux concentrators having magnetic anisotropy oriented transversely to length of active element
US6023226A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1998 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Jan 29, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12465
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A harmonic-type electronic article surveillance marker includes a thin, elongated active element and flux concentrators provided at the ends of the active element. The flux concentrators have magnetic anisotropies that are oriented perpendicular to the length of the active element. The orientation of the magnetic anisotropies and the anisotropy field of the flux concentrators stabilize the switching threshold of the marker. The switching threshold level can be controlled by varying parameters such as the angle of the magnetic anisotropies relative to the length of the active element, the strength of the anisotropy field of the magnetic anisotropies, and the geometry of the active element and the flux concentrators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.