System for concealed serialization utilizing a soft magnetic ant

Details System for concealed serialization utilizing a soft magnetic ant System for concealed serialization utilizing a soft magnetic ant

1996-06-07

1998-04-07

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 13187

Patent

active

057369291

ABSTRACT:
The invention relates to a special type of magnetic tag that serves both as an identifier of the article to which it is attached and as an antitheft device. Identification comes about through the use of an array of individual magnetic elements that are closely spaced, preferably along and perpendicular to an amorphous wire or strip. The wire or strip forms an integral part of the identification array and can be used as an anti-theft device to trigger an alarm when activated by an external field from a magnetic gate. The array may be personalized (coded) by leaving out elements of the array or by driving selected elements to saturation while others remain demagnetized. The elements can also be in the form of a double array to constitute `l`s and `0`s to form a code. Reading of the elements (code) is accomplished with a special reading head consisting of one or more small magnetic circuits coupled to one or more pickup loops utilizing, in some cases, the Matteucci effect.

REFERENCES:
patent: 4935724 (1990-06-01), Smith
patent: 4940966 (1990-07-01), Pettigrew et al.
patent: 5187354 (1993-02-01), Bengtsson
patent: 5420569 (1995-05-01), Dames et al.
patent: 5576693 (1996-11-01), Tyren et al.
K. Kawashima, et al "Mechanism of Matteucci Effect Using Amorphous Magnetic Wires", IEEE Translation Journal on Magnetics in Japan, vol. 8, No. 5, May 1993, pp. 318-325.

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