Optical: systems and elements – Holographic system or element – Authentication
Patent
1991-04-01
1992-08-25
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Authentication
283 86, 283 91, 356 71, 359572, G02B 518, G03H 102, B44F 112, B42D 1500
Patent
active
051423839
ABSTRACT:
Non-continuous reflective hologram or diffraction grating devices are provided in various forms for authenticating documents and things, such as those that contain visual information desired to be protected from alteration. Examples of such information include written personal data and photograph on a passport, driver's license, identity card, transportation pass, and the like. The reflective discontinuous hologram or diffraction device is formed in a pattern that both permits viewing the protected information through it and the viewing of an authenticating image or other light pattern reconstructed from it in reflection. The same master hologram or diffraction grating is made into distinct authenticaton devices by forming replicas thereof that have different patterns of reflective material which form distinct indicia, such as a different alpha-numeric character.
REFERENCES:
patent: 4034211 (1977-07-01), Horst et al.
patent: 4568141 (1986-02-01), Antes
patent: 4576439 (1986-03-01), Gale et al.
patent: 4662653 (1987-05-01), Greenaway
patent: 4685138 (1987-08-01), Antes et al.
patent: 4892385 (1990-01-01), Webster, Jr. et al.
American BankNote Holographics, Inc.
Arnold Bruce Y.
Lerner Martin
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