Optical: systems and elements – Holographic system or element – Authentication
Patent
1994-06-23
1997-06-17
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Authentication
359 10, 359 11, 359 32, G03H 100
Patent
active
056402554
ABSTRACT:
A method is disclosed to holographically mark an object in a way that the mark cannot be removed, reproduced, or transferred covertly. The mark can be read from a distance so that the part can be verified as the one and only original. The mark is applied to an undulating or rough surface of the object. The method requires that a reference wave be reflected from the surface and holographically recorded. This wave is then regenerated so that it travels in the opposite direction. This regenerated wave is itself reflected from the surface to form a collimated reference wave which, together with an object wave, is used to form the holographic mark. The recorded image cannot be observed without the presence of the surface itself.
REFERENCES:
patent: 3639029 (1972-02-01), Haines
patent: 4432597 (1984-02-01), Bjorklund et al.
patent: 4486070 (1984-12-01), Benton
patent: 4725111 (1988-02-01), Weitzen et al.
patent: 5155604 (1992-10-01), Miekka et al.
patent: 5260149 (1993-11-01), Monroe et al.
Dzierzynski Paul M.
Schuberg Darren E.
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