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Patent EP0428262A2 successfully refreshed from Google Patents.
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EP0428262A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Manufacture of electromagnetic articles, e.g. responder tags

Assignee: EMI Group Ltd
•
Filing: 1990-10-05
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Granted: —
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Expires: 2010-10-05
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Abstract

Abstract An electromagnetic article, such as a responder tag for detection by an electronic article surveillance (EAS) system, is fabricated by forming a deposit of a relatively low coercivity high permeability magnetic material on a substrate 22 under the influence of an applied magnetic field so as to provide the deposit with easy and hard axes of magnetisation. During deposition the substrate is subjected to a mechanical tension 32 so as to provide the deposit with an inherent benign strain substantially aligned with one of the axes of magnetisation. The inherent benign strain is arranged to dominate any detrimental strain to which the responder tag may be subjected during use, enabling detection by the EAS system to be maintained.

Inventors

  • 👤 Robert Alex Woolley

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 18:46
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G08B13/2411; G08B13/2428; G08B13/2437; G08B13/244; G08B13/2442; H; H01; H01F; H01F41/00; H01F41/14; H01F41/24; H01F41/26

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 69 words
A method of manufacturing an electromagnetic article, the method comprising subjecting a substrate to a mechanical strain and forming a deposit of a relatively low coercivity high permeability magnetic material on the substrate under the influence of an applied magnetic field thereby to provide the deposit with an easy and a hard axis of magnetisation and an inherent benign strain substantially aligned with one of the axes of magnetisation.
Claim 2
Independent Claim 69 words
A method of manufacturing an electromagnetic article, the method comprising subjecting a substrate to a mechanical strain and forming a deposit of a relatively low coercivity high permeability magnetic material on the substrate under the influence of an applied magnetic field thereby to provide the deposit with an easy and a hard axis of magnetisation and an inherent benign strain substantially aligned with one of the axes of magnetisation.
Claim 3
Dependent Claim 22 words
A method according to claim 1 wherein the benign strain comprises a tensile strain substantially aligned with the easy axis of magnetisation.
Claim 4
Dependent Claim 22 words
A method according to claim 1 wherein the benign strain comprises a compressive strain substantially aligned with the hard axis of magnetisation.
Claim 5
Independent Claim 19 words
A method according to any one of claims 1 to 3 wherein the deposit is formed by electrolytic deposition.
Claim 6
Independent Claim 41 words
A method according to any one of claims 1 to 4 wherein the substrate is subjected to the mechanical strain by bending the substrate about a curved surface curved about an axis substantially aligned with one of the axes of magnetisation.
Claim 7
Independent Claim 36 words
A method according to any one of claims 1 to 4 wherein the substrate is subjected to the mechanical strain by tensioning the substrate in a direction substantially aligned with one of the axes of magnetisation.
Claim 8
Independent Claim 24 words
A method according to any one of the preceding claims wherein the deposit of magnetic material comprises a plurality of layers of magnetic material.
Claim 9
Independent Claim 16 words
A method according to any one of the preceding claims wherein the substrate comprises polyester material.
Claim 10
Independent Claim 26 words
A method according to any one of the preceding claims wherein the magnetic material comprises a NiFe alloy having a nickel content between 30% and 80%.
Claim 11
Independent Claim 22 words
A method according to anyone of the preceding claims further comprising forming a layer of relatively high coercivity low permeability magnetic material.

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