Giesecke & Devrient Gmbh

Beb Industrie-elektronik Ag

Armin Stockli

Elisabeth Paul

Checking of security elements for value documents, which have a plurality of magnetic regions, includes at least a high-coercivity magnetic region having a high-coercivity magnetic material, a low-coercivity magnetic region having a low-coercivity magnetic material, and, where applicable, a combined magnetic region containing both the high-coercivity and the low-coercivity magnetic material. After magnetization of all magnetic materials or the magnetic regions formed therefrom in one direction with a first magnetic field region, only the low-coercivity magnetic material is remagnetized in another direction in a subsequent second magnetic field region. Magnetic signals of the magnetic regions are captured while the security element is still subjected to the second magnetic field region. On the basis of the signals all three types of magnetic region can be reliably distinguished.

Check of a security element furnished with magnetic materials

A method is proposed for separating worn bank notes from a quantity of bank notes in bank note processing machines. A target rate cof bank notes to be separated is prescribed. The bank notes are assessed one after the other. In the process they are counted. Further, the value of at least one physical parameter of each bank note affected by wear is measured during the assessment. The measured value, or a value derived therefrom, of each bank note is compared with a threshold value during the assessment. If the threshold value is exceeded, the bank note in question is separated during the assessment. The separated bank notes are counted during the assessment. The threshold value is adapted after assessing each bank note or after a fixed prescribed number m&#x3e;&#x3e;n of bank notes by feedback control. The control parameter is the rate cof the bank notes separated up to said bank note, and the set parameter is the threshold value.

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Ittigen, Switzerland

Armin Stockli