G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/18 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01) G03H 1/04 (2006.01) G06K 19/06 (2006.01) G06K 19/16 (2006.01)
Patent
CA 2155382
A light diffracting structure in an authenticating pattern especially for an authentication label is used for authenticating and protecting against forgery various valuable objects. The light diffracting structure has unique parameters generating a uniquely coloured pattern. The unique parameters are randomly defined by anisotropic process steps during the manufacturing of the diffractingstructure and are not under full control of the producer. This prevents copying or creating an exact replica thereof. The authenticating pattern comprises an integrated structure of a substrate layer and a transparent overcoat layer and the viewable interface therebetween includes the light diffracting structure. The uniquely coloured authenticating pattern can be verified by simple observation with the naked eye which is a prerequisite for ubiquitous verification.
International Business Machines Corporation
Saunders Raymond H.
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