Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-09-29
1999-06-01
Tong, Nina
Communications: electrical
Condition responsive indicating system
Specific condition
3405723, 3405726, G08B 1314
Patent
active
059091770
ABSTRACT:
The present invention is directed to a security element for electronic article surveillance in an electromagnetic surveillance system, comprising a soft magnetic, magnetostrictive strip and a premagnetization element fabricated from a semi-hard or hard magnetic material that is associated with the strip, and to a method of manufacturing such security elements.
With regard to the security element the premagnetization element is configured such that, by application of an essentially constant external field (H), it produces a stray field that optimizes the magneto-elastic properties of the stripe.
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Esselte Meto International GmbH
Tong Nina
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