Electronic anti-theft element

US6262663A · kind A · utility

Inventors

• Richard Altwasser · Hamm (Sieg), DE
• Peter Lendering · Doetinchem, NL

Key dates

• Filing date: Feb 8, 1999
• Grant date: Jul 17, 2001
• Expiry date: Feb 8, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G08B13/2437
• WIPO field: Control
• WIPO sector: Instruments

Abstract

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