Magnetic recording device for providing security related information
AssigneeSociete Pyral
InventorRoland Peronnet
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Abstract
A magnetic recording device for providing security related information includes a magnetic base carrier having substantially uniform thickness and zone of increased or decreased thickness on the base carrier forming thickness increments. The thickness increments impart different magnetic characteristics to the recording device to amplitude modulate a magnetic signal recorded thereon and thereby provide security related information. Processes for the preparation and application of such a device are also disclosed.
Claims13
A magnetic recording device for providing security related information in a manner which inhibits forgery of the information;
- comprising:
- a magnetic recording base carrier in the form of a tape having substantially uniform thickness;
- and
- a plurality of thickness increments, each having the same coercivity as said magnetic recording base carrier, forming zones on the magnetic recording carrier in which the thickness of the recording device differs from the average uniform thickness of the base carrier by an amount greater than 40% of the average uniform thickness of the base carrier, to thereby impart different magnetic properties to the recording device in the areas of said zones.
Dependencies are inferred from the claim text.