초록 ▼

A deactivation and coding system for a contactless antitheft or identification label, uses a pyrotechnic material to burn away a track portion, whereby an electrical connection is severed. The labels in the system according to the invention consist of tuned circuits in the form of one or more coil/c

A deactivation and coding system for a contactless antitheft or identification label, uses a pyrotechnic material to burn away a track portion, whereby an electrical connection is severed. The labels in the system according to the invention consist of tuned circuits in the form of one or more coil/capacitor combinations. Deactivation can be effected by severing the connection between a coil and the associated capacitor. Coding can be effected by severing the connection with one of several parallel-connected coils or capacitors. Coding can also be effected by removing an initial short-circuit of one of several series-connected capacitors. The pyrotechnic material may consist of one or a combination of the mixtures Pb3O4, Si, Ti and Fe2O3; PbCrO4, and Zr; Pb3O4, Si and KNO2; and Pb3O4 and Si or a mixture having comparable properties. The heat released during the combustion reaction can be used in combination with a thermosensitive paper for the purpose of causing readable information to appear on the label upon deactivation or coding. The use of protective foils can prevent damage to the goods on which the labels are provided.

대표청구항 ▼

A contactless label for antitheft or identification purposes, comprising an electric circuit, wherein the label comprises a pyrotechnic mixture which is provided adjacent at least one electroconductive connection of the electric circuit, in such a manner that the pyrotechnic mixture upon being ignit

A contactless label for antitheft or identification purposes, comprising an electric circuit, wherein the label comprises a pyrotechnic mixture which is provided adjacent at least one electroconductive connection of the electric circuit, in such a manner that the pyrotechnic mixture upon being ignited severs the electroconductive connection by combustion, with the electrical properties of the electric circuit altering as a result of the severance of the electroconductive connection.