Giesecke & Devrient Gmbh

Giesecke+devrient Currency Technology Gmbh

Elisabeth Paul

Jurgen Schutzmann

Wolfgang Rauscher

Jürgen Schützmann

Christoph Mengel

Armin Stockli

Armin Stöckli

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 testing configuration for testing a security document includes a security element, having a high-coercivity magnetic material and a low-coercivity magnetic material, a device comprising such a test configuration and to a relevant test method. The high- and low- coercivity magnetic materials of the security element are magnetized in a first direction by the interaction of first and second magnet pair units, and subsequently the low-coercivity magnetic material is remagnetized in a second magnetization direction by means of the second magnet pair unit. The magnet pair units are arranged with respect to one another in such a closely adjacent manner along the transport path of the security document that the first magnet field strength is greater than the magnet field strength provided by the first magnet pair unit alone and is greater than the magnet field strength provided by the second magnet pair unit alone.

Checking arrangement for value-document check

A method of checking value documents having a security element with a plurality of magnetic areas, including a high-coercivity magnetic area, a low-coercivity magnetic area and a combined magnetic area, which contains both the high-coercivity and the low-coercivity magnetic material. When all magnetic areas have been magnetized in a first direction, second magnetization is performed, which involves only the low-coercivity magnetic material being remagnetized parallel to the first magnetization in the opposite direction, but the high-coercivity magnetic material remaining oriented in the first direction of magnetization. Next, first magnetic signals from the security element are detected using a first magnetic detector, and second magnetic signals are detected using a second magnetic detector. The magnetic signals are used to identify each magnetic area of the security element as a high-coercivity, a low-coercivity or a combined magnetic area.

Method and apparatus for checking value documents

The invention relates to a method and an apparatus for checking documents of value which have a security element with several magnetic areas, including at least one high-coercive magnetic area, at least one low-coercive magnetic area and at least one combined magnetic area which contains both the high-coercive and the low-coercive magnetic material. After the magnetization of all magnetic areas in a first direction, first magnetic signals of the security element are detected with a first magnetic detector. After a subsequent second magnetizing, which is effected antiparallel to the first magnetizing and magnetically reverses only the low-coercive magnetic material, second magnetic signals of the security element are detected. For identifying the magnetic areas, the second magnetic signals or a signal derived therefrom are compared with two thresholds.

Method and device for testing value documents

The invention relates to a magnetic sensor for checking documents of value and an apparatus and a method, wherein there are used a magnetization device for magnetizing a document of value and the magnetic sensor for detecting magnetic signals of the document of value. The magnetic sensor has two sensor lines which have several magneto-sensitive elements with different main sensitivity directions which are oriented in particular perpendicular to each other. The first sensor line selectively detects first magnetic areas of the document of value of a first coercive field strength and the second sensor line selectively detects second magnetic areas of the document of value of a second coercive field strength. Since the differently coercive magnetic areas of the document of value are detected independently of each other, there can be ascertained reliably and independently of each other two magnetic codings from differently coercive magnetic areas, which are arranged on the same document of value.

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Raubling, Germany

Elisabeth Paul