VERFAHREN UND VORRICHTUNG ZUR ECHTHEITSPRUEFUNG VON AUFZEICHNUNGSTRAEGERN, DIE GEGEN FAELSCHUNG ZU SICHERN SIND

A process for authenticating recording media which are to be safeguarded against falsification and which possess discrete regions of an exchange-anisotropic magnetic material, by comparison of the polarity of a residual magnetization which is left over, because of the exchange anisotropy of the magn...

Full description

Saved in:
Bibliographic Details
Main Authors STEUERWALD,MANFRED, HACK,JOACHIM, KOESTER,.,DR.,EBERHARD
Format Patent
LanguageGerman
Published 19.06.1981
Subjects
CALCULATING
CHECKING-DEVICES
COMPUTING
COUNTING
HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING
HANDLING RECORD CARRIERS
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
Online AccessGet full text

Cover

More Information
Summary:A process for authenticating recording media which are to be safeguarded against falsification and which possess discrete regions of an exchange-anisotropic magnetic material, by comparison of the polarity of a residual magnetization which is left over, because of the exchange anisotropy of the magnetic material, from a predetermined initial magnetization after exposure of the material to a specific temperature cycle and, subsequently, to a magnetic AC field which decreases to zero, with the polarity of a residual magnetization formed in the same way from an opposite initial magnetization, and an apparatus for carrying out the said process.
Bibliography:Application Number: DE19792950174