Patent
Identification article with pattern-form fresnel hologram, fabrication thereof, and verification thereof
TLDR
In this article, a pattern-form Fresnel hologram is formed by exposing a photosensitive resin layer to an interference light obtained from interference between an object light beam and a reference light beam both obtained by dividing a single coherent light.Abstract:
An identification article comprise a substrate and a pattern-form Fresnel hologram provided as an identification information providing layer on the surface or in the interior of the substrate structure. The pattern-form Fresnel hologram is formed by (a) forming a Fresnel hologram by exposing a photosensitive resin layer to an interference light obtained from interference between an object light beam and a reference light beam both obtained by dividing a single coherent light, (b) exposing the Fresnel hologram to light transmitted through a mask pattern, (c) fabricating a pattern-form Fresnel hologram by developing the Fresnel hologram, and (d) reconstructing the pattern-form Fresnel hologram thus obtained. The identification article is verified by projecting a monochromatic light onto the hologram to reproduce an image and projecting this image on a screen or detecting it with a light detector.read more
Citations
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Non-continuous holograms, methods of making them and articles incorporating them
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TL;DR: A wallet card adapted for use in reading externally stored information includes a transparent, substantially non-foldable semi-rigid base comprising a magnifying lens as mentioned in this paper, which is formed by heating a lens forming die to a temperature sufficient to soften the base material and then cooling the die prior to withdrawing the die from the base materials.
References
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Patent
Identification card having a reference beam coded hologram
TL;DR: In this article, a beam scrambler is used to introduce random path distances in either the reference or object beam during the formation of the hologram, which can be used for identifying persons, articles, documents and the like using a coded hologram.
Patent
Method for producing a surface relief pattern
TL;DR: In this paper, surface relief patterns of predetermined configuration are fabricated by a process which involves exposing a photosensitive material at a first position to a laser interference pattern, rotating said material about an axis perpendicular to its surface to a second position, wherein at least one and preferably both of said exposures is individually below the effective threshold for linear response of said material, the points of intersection of the two fringe patterns being exposed above said threshold as a result of the combined exposures, and developing said material.
Patent
Identification card having a hologram superimposed on printed data
TL;DR: A falsification-proof identity card comprises a first transparent layer on the underneath side of which conventional data is applied by printing technology as discussed by the authors, which can be read out by light transmission or by light reflection, depending on the transparency of the layer, and which contains at least the visible data printed on the first layer in a direct recording.
Patent
Identification document and display unit therefor
Claus Jung,Klaus Frank +1 more
TL;DR: In this article, the authors present an identification document that contains idential data both in visual and holographic form, and demonstrate that simultaneous display of the visual data and the holographic data in closely adjacent relationship permits ready detection of counterfeiting, alteration and misuse.
Patent
Identification card with a hologram and a process for the production thereof
TL;DR: In this paper, an identification card is produced by first recording the visible information on a layer and then recording a hologram in a portion of the layer, where the signals which correspond to the machine-readable coded information are separated from the other signals and processed separately.