Embedded information carrier for optical data

Details Embedded information carrier for optical data Embedded information carrier for optical data

2007-01-09

2007-01-09

Boutsikaris, Leondas (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

C359S015000, C430S010000, C428S029000, C428S916000, C356S071000, C283S086000

Reexamination Certificate

active

10822044

ABSTRACT:
In a system for authenticating information, a holographic element, including a first layer of optical information in a first coded pattern and a second layer of optical information in a second coded pattern is inserted into a reader. The reader includes an opening into which the holographic element may be positioned, a light source, a first detector positioned at a first predetermined distance from the location of the holographic element when the holographic element is positioned in the opening, and a second detector positioned at a second predetermined distance from the location of the holographic element when the holographic element is positioned in the opening.

REFERENCES:
patent: 4171864 (1979-10-01), Jung et al.
patent: 5825547 (1998-10-01), Lee
patent: 6271967 (2001-08-01), Stork
patent: 6280891 (2001-08-01), Daniel et al.
patent: 6369919 (2002-04-01), Drinkwater et al.
patent: 6697179 (2004-02-01), Hsiao
patent: 2004/0233485 (2004-11-01), Moon et al.

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