Electronic anti-theft element

Details Electronic anti-theft element Electronic anti-theft element

G - Physics

08

B

G08B 13/24 (2006.01)

Patent

CA 2262573

An electronic anti-theft element consists of at least one spiral printed circuit (2; 3), a capacitor and a dielectric layer (4) arranged therebetween, or of two spiral printed circuits (2, 3) which are arranged on both sides of a dielectric layer (4) in an at least partially overlapping manner (forming resonant circuit (6)). The object of the invention is to provide a resonant circuit (6) which is less liable to be reactivated. For that purpose, in at least one selected area (8) (a rated break point) of the dielectric layer a short-circuit is created between the opposite capacitor plates or spiral printed circuits (2, 3) when a sufficiently high energy is supplied by a magnetic alternating field. The selected area (8) is locally reinforced, preventing the suppression of the short-circuit by mechanical stress and the reactivation of the anti-theft element (6).

Un élément antivol électronique comporte au moins un circuit imprimé en spirale (2; 3), un condensateur et une couche diélectrique (4) intercalée entre les deux, ou bien deux circuits imprimés en spirale (2, 3) qui sont disposés des deux côtés d'une couche diélectrique (4) au moins partiellement à recouvrement (formant le circuit à résonance (6)). L'invention a pour objet de créer un circuit à résonance (6) à probabilité de réactivation réduite. A cet effet, dans au moins une région choisie (8) (un point destiné à la rupture) de la couche diélectrique, un court-circuit est créé entre les plaques de condensateur opposées ou les circuits imprimés en spirale (2, 3) lorsqu'une énergie suffisamment élevée est fournie par un champ alternatif magnétique. La région choisie (8) est localement renforcée, empêchant la suppression du court-circuit par sollicitation mécanique et ainsi la réactivation de l'élément antivol (6).

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