Sensormatic Electronics Corporation

Tyco Fire + Security Gmbh

Vacuumschmelze Gmbh

Other

Nen-Chin Liu

Ming-Ren Lian

Wing Kei Ho

Robert C O'Handley

Giselher Herzer

Richard Loyd Copeland

Gopal Chandramowle

Randy J Zirk

Larry Speciale

Hubert A Patterson

Kevin Robert Coffey

Jimmy Cantey

Systems () and methods () for making a marker. The methods comprise: obtaining a resonator material which has been annealed under a tensile force selected to provide a maximum resonant amplitude at a bias field; providing by a bias material of the marker an operating bias field with a value less than a value of the bias field; forming a first housing portion from a flexible material so as to have a planar shape; and forming a second housing portion from the flexible material so as to comprise a cavity in which the resonator and bias materials can be housed when the second housing portion is coupled to the first housing portion. The cavity is defined by two opposing short sidewalls, two opposing elongate sidewalls (OESW) and a bottom sidewall. Each of OESW is stiffened by forming a plurality of first stiffener edge features along an exterior surface thereof.

Enhanced signal amplitude in acoustic-magnetomechanical EAS marker

Systems () and methods () for making a marker. The methods comprise: obtaining a resonator material which has been annealed under a tensile force selected to provide a maximum resonant amplitude at a bias field Hin the marker; and providing with the bias material of the marker an operating bias field Hwith a value less than a value of said bias field H. The value of His reduced by performing at least one of the following operations: selectively modifying a geometry of a bias material which is to be disposed in a housing of the marker; selectively modifying a spacing between the resonator material and the bias material arranged in a stacked configuration; and partially de-gaussing the bias material subsequent to being fully saturated.

A magnetomechanical tag for use in an electronic article surveillance (EAS) system and a method of manufacturing the magnetomechanical tag may be provided. The EAS may include at least one resonator, a housing configured to allow vibration therein of the at least one resonator and a cover heat sealed to the housing at a heat sealing temperature. The EAS tag further may include a powder lubricant within the housing. The powder lubricant may have a melting temperature less the heat sealing temperature.

Magnetomechanical tag used in electronic article surveillance and method of manufacturing a magnetomechanical tag

A ferromagnetic resonator for use in a marker in a magnetomechanical electronic article surveillance system is manufactured at reduced cost by being continuously annealed with a tensile stress applied along the ribbon axis and by providing an amorphous magnetic alloy containing iron, cobalt and nickel and in which the portion of cobalt is less than about 4 at %.

Amorphous alloys for magneto-acoustic markers in electronic article surveillance having reduced, low or zero co-content and method of annealing the same

Amorphous alloys for magneto-acoustic markers having reduced, low or zero cobalt content, and associated article surveillance system

A method and apparatus to enhance magnetoimpedance effect using magnetomechanical resonance are described.

Enhancing magneto-impedance modulation using magnetomechanical resonance

A magnetostrictive element for use in a magneto-mechanical marker has a resonant frequency characteristic that is at a minimum at a bias field level corresponding to the operating point of the magnetomechanical marker. The magnetostrictive element has a magnetomechanical coupling factor k in the range 0.28 to 0.4 at the operating point. The magnetostrictive element is formed by applying cross-field annealing to an iron-rich amorphous metal alloy ribbon (45 to 82 percent iron) which includes a total of from 2 to 17 percent of one or more of Mn, Mo, Nb, Cr, Hf, Zr, Ta, V. Cobalt, nickel, boron, silicon and/or carbon may also be included. The metal alloy may include one early transition element selected from the group consisting of Zr, Hf and Ta, and also a second early transition element selected from the group consisting of Mn, Mo, Nb, Cr, and V.

Iron-rich magnetostrictive element having optimized bias-field-dependent

A magnetostrictive element for use in a magnetomechanical marker has a resonant frequency characteristic that is at a minimum at a bias field level corresponding to the operating point of the magnetomechanical marker. The magnetostrictive element has a magnetomechanical coupling factor k in the range 0.28 to 0.4 at the operating point. The magnetostrictive element is formed by applying current-annealing to an iron-nickel-cobalt based amorphous metal ribbon, or by cross-field annealing an iron-nickel-cobalt alloy that includes a few percent chromium and/or niobium.

Magnetostrictive element having optimized bias-field-dependent resonant

A magnetostrictive element for use in a magnetomechanical article surveillance marker formed by first annealing an amorphous metal alloy, such alloy comprising iron and cobalt with the proportion of cobalt being in the range of about 5 to about 45 atomic percent, in the presence of a saturating magnetic field and then second annealing the alloy in the absence of the saturating magnetic field.

Magnetostrictive element for use in a magnetomechanical surveillance

A longitudinal curvature in an amorphous metal alloy ribbon is reduced by heat-treatment. While the heat-treatment occurs, the alloy ribbon is bent 'backwards' against the longitudinal curvature, to reduce the amount of heat-treatment required. The process is carried out continuously by transporting the alloy ribbon from reel to reel, while wrapping the ribbon around a heated roller. Using a discrete strip cut from the alloy ribbon subjected to the curvature-reducing process, a magnetomechanical EAS marker is constructed that has a relatively low profile, while retaining desired magnetic properties.

Curvature-reduction annealing of amorphous metal alloy ribbon

A magnetostrictive element for use in a magnetomechanical electronic article surveillance marker is formed by annealing a continuous ribbon of an amorphous metal alloy. The alloy ribbon is transported from reel to reel through an oven in which a transverse saturating magnetic field is applied to the ribbon. The annealed ribbon is cut into discrete strips which are suitable for use as magnetostrictive elements.

Continuous process and reel-to-reel transport apparatus for transverse

A two-step continuous annealing process is applied to an amorphous metal alloy ribbon. During the first annealing step, a saturating transverse magnetic field is applied, and the field is omitted during the second annealing step. After the two annealing steps, the material is cut into discrete strips suitable for use as active elements in pulsed-field magnetomechanical EAS markers. The resulting markers exhibit satisfactory total frequency shift and ring-down signal amplitude characteristics, without excessive sensitivity to bias field variations.

Two-stage annealing process for amorphous ribbon used in an EAS marker

A self-biasing magnetostrictive element for a magnetomechanical EAS marker is formed by first annealing a ribbon of ferromagnetic material in the presence of a magnetic field applied in a transverse direction relative to the ribbon's longitudinal axis, and then annealing the ribbon a second time in the presence of a magnetic field applied in the direction of the longitudinal axis. The twice-annealed ribbon exhibits remanent magnetization along the longitudinal axis and has plural magnetic domains situated along the longitudinal axis. The orientation of magnetization in each domain is canted by .+-..theta..degree.&lt;90.degree. from the ribbon axis with the direction of canting alternating from domain to domain.

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Parkland, FL, United States of America

Nen-Chin Liu