Multi-layer thin-film EAS marker

Details Multi-layer thin-film EAS marker Multi-layer thin-film EAS marker

1990-06-01

1992-01-21

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, 365173, G08B 1314, G11C 1115

Patent

active

050831127

ABSTRACT:
A marker for use in magnetic-type electronic article surveillance systems, comprising a substrate on which are deposited a plurality of high permeability, low coercive force magnetic thin-films, each being separated from an adjacent magnetic thin-film by a non-magnetic thin-film. Each of the magnetic films have substantially the same permeability and coercive force, and the non-magnetic films are of a thickness to allow magnetostatic coupling while inhibiting exchange coupling. Accordingly, all of the magnetic thin-films reverse as a single entity and produce a sharp, readily distinguishable response.

REFERENCES:
patent: 3576552 (1971-04-01), Vinal
patent: 4012781 (1977-03-01), Lin
patent: 4112503 (1978-09-01), Lins
patent: 4356523 (1982-10-01), Yeh
patent: 4698711 (1987-10-01), Vinal
patent: 4825197 (1989-04-01), Church et al.
patent: 4960651 (1990-10-01), Pettigrew et al.

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