System for authenticating printed documents

Details System for authenticating printed documents System for authenticating printed documents

1998-02-13

1999-11-02

Brock, Michael

Measuring and testing

Vibration

By mechanical waves

73159, 734321, 209534, 209590, 194206, G01B 1708

Patent

active

059748834

ABSTRACT:
A system for authenticating bank notes by checking for raised print (37) produced by an intaglio printing process which only occurs on genuine bank notes. Each note (36) is individually transported past a pair of brushes (38) whose bristles are in contact with the two faces of the note. Microphones (28) are placed in close proximity to the brush means to sense the noise from the brush means which increases when there is raised print. Output from the microphones are digitized and applied to a data processing means (22) which determines whether the note contains raised printing, and hence whether the note is genuine or not, by generating a value based on the digitized outputs of the microphones (28) and comparing this value with stored values.

REFERENCES:
patent: 3583237 (1971-06-01), Bayha
patent: 3683681 (1972-08-01), Taylor
patent: 4463607 (1984-08-01), Hilton
patent: 4869101 (1989-09-01), Dvorsky
patent: 4938071 (1990-07-01), Kobayashi et al.
patent: 5014547 (1991-05-01), Holroyd

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