CA2149380A1 - Magnetomechanical article surveillance marker with a tunable resonant frequency - Google Patents
Magnetomechanical article surveillance marker with a tunable resonant frequencyInfo
- Publication number
- CA2149380A1 CA2149380A1 CA 2149380 CA2149380A CA2149380A1 CA 2149380 A1 CA2149380 A1 CA 2149380A1 CA 2149380 CA2149380 CA 2149380 CA 2149380 A CA2149380 A CA 2149380A CA 2149380 A1 CA2149380 A1 CA 2149380A1
- Authority
- CA
- Canada
- Prior art keywords
- resonant frequency
- article surveillance
- marker
- tunable resonant
- surveillance marker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
A marker for use in a magnetomechanical electronic article surveillance (EAS) system is made by mounting a magnetostrictive element in a housing adjacent to a biasing element that is magnetized to a degree of magnetization that is less than saturation. The resonant frequency of the marker is detected. If the detected resonant frequency does not match a predetermined operating frequency of the EAS system, the degree of magnetization of the biasing element is adjusted so as to tune the resonant frequency of the marker to the predetermined operating frequency.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/269,651 US5469140A (en) | 1994-06-30 | 1994-06-30 | Transverse magnetic field annealed amorphous magnetomechanical elements for use in electronic article surveillance system and method of making same |
US08/269,651 | 1994-06-30 | ||
US08/288,556 | 1994-08-10 | ||
US08/288,556 US5495230A (en) | 1994-06-30 | 1994-08-10 | Magnetomechanical article surveillance marker with a tunable resonant frequency |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2149380A1 true CA2149380A1 (en) | 1995-12-31 |
CA2149380C CA2149380C (en) | 2005-03-29 |
Family
ID=26953818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2149380 Expired - Fee Related CA2149380C (en) | 1994-06-30 | 1995-05-15 | Magnetomechanical article surveillance marker with a tunable resonant frequency |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2149380C (en) |
-
1995
- 1995-05-15 CA CA 2149380 patent/CA2149380C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2149380C (en) | 2005-03-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |