CA2149380A1 - Magnetomechanical article surveillance marker with a tunable resonant frequency - Google Patents

Magnetomechanical article surveillance marker with a tunable resonant frequency

Info

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
Application number
CA 2149380
Other languages
French (fr)
Other versions
CA2149380C (en
Inventor
Ming-Ren Lian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sensormatic Electronics Corp
Original Assignee
Ming-Ren Lian
Sensormatic Electronics Corporation
Tyco Acquisition Corp. Xxiv
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/269,651 external-priority patent/US5469140A/en
Priority claimed from US08/288,556 external-priority patent/US5495230A/en
Application filed by Ming-Ren Lian, Sensormatic Electronics Corporation, Tyco Acquisition Corp. Xxiv filed Critical Ming-Ren Lian
Publication of CA2149380A1 publication Critical patent/CA2149380A1/en
Application granted granted Critical
Publication of CA2149380C publication Critical patent/CA2149380C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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.
CA 2149380 1994-06-30 1995-05-15 Magnetomechanical article surveillance marker with a tunable resonant frequency Expired - Fee Related CA2149380C (en)

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)

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