Device for sensing magnetically marked paper and marked paper readable by said device
First Claim
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1. Marked paper document characterised in that it comprises a polymer layer containing glass-covered amorphous ferromagnetic filaments (F) incorporated and dispersed by mixing in the polymer layer.
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Abstract
The invention relates to a marked paper document and a marked paper document detection device. The device comprises excitation means (A1, A2, A3) for varying the magnetization of glass-covered amorphous ferromagnetic filaments contained in the marked paper document with time, and means for detecting a variation in the magnetization of the ferromagnetic filaments.
The invention is applicable to checking reproduction of documents and authentication of documents.
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Citations
22 Claims
- 1. Marked paper document characterised in that it comprises a polymer layer containing glass-covered amorphous ferromagnetic filaments (F) incorporated and dispersed by mixing in the polymer layer.
- 7. Process for making a paper document, characterised in that it comprises a step during which glass-covered amorphous ferromagnetic filaments (f) are incorporated and dispersed by mixing into a polymer layer.
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