Optical recording media having optically-variable security prope

Details Optical recording media having optically-variable security prope Optical recording media having optically-variable security prope

1993-04-29

1996-08-27

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

420 642, 420 643, 420 644, 420 645, 420 648, 420913, 420916, 4302701, 43027011, 43027012, 43027013, 43027014, 430475, 430945, 369283, 369288, B32B 300

Patent

active

055499538

ABSTRACT:
The prevention of counterfeiting of currencies, passports, cheques, bank cards, credit cards, optical disks and the like is addressed by introducing thin film structures having both optically-variable security properties and encoded optical data decodable by optical means. The thin film structures comprise a substrate and a multilayer interference coating carried by the substrate, producing an inherent color shift with a change of viewing angle. The multilayer interference coating has a dielectric material which is transparent and the recording layer made of a light absorbing material, a crystalline-structural changing material or a magneto-optic material. The encoded data is in the form of bar codes or digital data. The information is encoded by photolithographic means or by optical recording means. The encoded data is retrieved by an optical recording system having a light source and an optical guiding system and a light detector.

REFERENCES:
patent: 5147701 (1992-09-01), Furukawa
patent: 5154957 (1992-10-01), Yamada et al.
patent: 5196250 (1993-03-01), Abe et al.

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