Crane Payment Innovations Gmbh

National Rejectors, Inc. Gmbh

Crane Payment Solutions Gmbh

Mint of Finland Ltd.

Staatliche Munzen Baden-wurttemberg

Saxonia Eurocoin Gmbh

Bayerisches Hauptmunzamt

Staatliche Münzen Baden-württemberg Münzstätte Stuttgart Und Münzstätte Karlsruhe

Spaleck Oberflächentechnik Gmbh & Co. Kg

Coinstitute Gmbh

Klaus Meyer-Steffens

Wilfried Meyer

Peter Huber

Hans-Ulrich Cohrs

Manfred Gro/ Hlich

Boris Golkov

Christoph Frenz

Ingmar GRÜNDEL

Oleksandr Derkach

Konstantin Li

Günther Waadt

Anatolii Akulinin

Jörg MÜLLER

Stephan Siegel

Thomas Bilas

Gunther Waadt

A coin comprises a core made of a first metal, an outer ring surrounding the core concentrically and made of a further metal, and a central ring between the core and outer ring fixedly connected thereto. The central ring consists of an electrically insulating material. Further, the central ring is transparent to electromagnetic waves of a first wavelength range and is less transparent or not transparent to a second wavelength range. Methods for testing the coin are also described.

Coin and method for testing the coin

A method for calibrating a coin checking device includes inserting a calibrating module into a coin passage. The coin passage contains at least one coin sensor for determining a coin's physical features. The calibrating module generates measuring signals which simulate an acceptable coin's presence. The measuring signals are received by the at least one coin sensor which in turn outputs sensor signals. The measuring signals and the sensor signals are used to calculate a calibration factor for the coin checking device.

Method and apparatus for calibrating a coin checking device

Growing community of inventors

Deinste, Germany

Klaus Meyer-Steffens