Optical: systems and elements – Holographic system or element – Authentication
Reexamination Certificate
2005-08-09
2005-08-09
Boutsikaris, Leonidas (Department: 2872)
Optical: systems and elements
Holographic system or element
Authentication
C359S567000, C283S086000, C430S010000
Reexamination Certificate
active
06927885
ABSTRACT:
A label (1) made from a layer composite (15) includes at least one machine-readable diffractive bar code (3) consisting of narrow rectangular fields (4) occupied by the optically active structures and intermediate surfaces (5). The optically active structures which are covered by a reflection layer are embedded between layers of the layer composite (15). The diffractive relief structure used in the diffractive bar code (3) for the fields (4) diffracts and polarizes incident light and scatters the diffracted light into a half-space above the diffractive relief structure. A second diffractive relief structure differs at least in respect of the polarization of the polarizedly backscattered light with respect to the first diffractive relief structure. The second diffractive relief structure can be used for example for field surfaces of a second bar code in the bar code field (9) on the label (1) or for the intermediate surfaces (5). The light which is polarizedly backscattered at the diffractive bar code (3) can be detected by means of one of the known commercially available reading apparatuses for bar codes produced by printing. The bar code produced by printing can be used for individualizing the labels (1).
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Gehr Peter
Schilling Andreas
Staub Rene
Tompkin Wayne Robert
Boutsikaris Leonidas
Hoffmann & Baron , LLP
OVD Kinegram AG
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