Coding security threads for bank notes and security papers

Details Coding security threads for bank notes and security papers Coding security threads for bank notes and security papers

B - Operations, Transporting

42

D

283/20, 283/30,

B42D 15/00 (2006.01) G06K 7/016 (2006.01) G07D 7/04 (2006.01) G07D 7/20 (2006.01)

Patent

CA 2025666

A security thread (1) for a bank note comprises a discontinuous magnetic thread (3) which has binary coding, the binary values being denoted by the presence or absence of bit lengths of thread. The coding employed is repetitive, comprising alternating termination segments (4) and word segments (5). The length of a termination segment in terms of bit lengths is less than the length of a word but is greater than the maximum length permitted within a word of bits which have the same binary value as the bits in a termination segment. The invention provides resistance to false readings and, by varying the parameters of bit length, word length, length of the termination segment and otherwise, a multiplicity of different codings having the same general format.

Fil de sécurité (1) pour un billet de banque comprenant un fil magnétique discontinu (3) à code binaire, les valeurs binaires étant indiquées par la présence ou l'absence de longueurs de bits du fil. Le code répétitif comporte des segments de terminaison (4) et de mots (5) alternatifs. La longueur d'un segment de terminaison exprimée en longueurs de bits est inférieure à la longueur d'un mot, mais est supérieure à la longueur maximale permise au sein d'un mot de bits qui ont la même valeur binaire que les bits d'un segment de terminaison. L'invention offre une résistance aux fausses lectures et crée, en variant les paramètres pour la longueur de bits, de mot, du segment de terminaison et d'autres éléments, une multitude de différents codes présentant le même format général.

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