Identity document difficult to falsify and a process for manufac

Details Identity document difficult to falsify and a process for manufac Identity document difficult to falsify and a process for manufac

1985-10-11

1988-12-13

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 93, 283904, 358298, B42D 1500

Patent

active

047905662

ABSTRACT:
An identity document has graphical information printed on a support and including uncoded alphanumerical information which is specific to a holder of the document or to the document. The surface of the support is broken down into a network of macropixels each having a predetermined average light absorption level. Each of the micropixels in turn consists of a dot pattern matrix of micropixels each having a light absorption level selected among at least two predetermined levels and distributed for the average absorption of each of the macropixels to be said predetermined average light absorption level and for constituting a screen which reproduces on a microscopic scale part at least of the uncoded specific information.

REFERENCES:
patent: 3977007 (1976-08-01), Berry et al.
patent: 4342051 (1982-07-01), Suzuki et al.
patent: 4365275 (1982-12-01), Berman et al.
patent: 4389712 (1983-06-01), Frattarola et al.
patent: 4491875 (1985-01-01), Kawamura
patent: 4525729 (1985-06-01), Agulnek et al.
patent: 4543613 (1985-09-01), Sakamoto
"New Gray Scale Printing Method Using a Thermal Printer"; Tokunaga, Y; Kubota, K; Ohya, J; IEEE Transactions on Electron Devices vol. Ed-30, No. 8, Aug. 1983, pp. 898-904.

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