Optical: systems and elements – Holographic system or element – Hardware for producing a hologram
Reexamination Certificate
2008-01-15
2008-01-15
Boutsikaris, Leonidas (Department: 2872)
Optical: systems and elements
Holographic system or element
Hardware for producing a hologram
C430S001000, C385S037000
Reexamination Certificate
active
10550411
ABSTRACT:
An optical device generated by interferometric lithography, in the form of a surface relief pattern that diffracts light, to be used mainly in optical security, produced by optical systems compliant with the Schimpflug and hinge Rules containing: two identical lenses L1and L2, two physical object location B1e B2and one image plane A1≡A2. No physical mask is needed throughout the origination process, thus eliminating any kind of border effects. The device actually implements an in-plane focused hologram, with a complex surface pattern of valleys and ridges with a non-trivial generating function, which is, by itself, both an additional security feature of the device and its fingerprint. The time to generate the optical device is proportional to the number of colours specified for the reference geometry and not depend on the overall area of the optical device.
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Nunes Vicente Rebordao Jose Manuel
Pereira Cabral Alexandre
Boutsikaris Leonidas
Imprensa Nacional Casa Da
Pearl Cohen Zedek Latzer LLP
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