Holograms and Hologram Fabrication Methods and Apparatus
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Abstract
This invention relates to improved methods of fabricating hologram systems, in particular holograms on a substrate such as a security document or bank note, to hologram systems fabricated by the described methods, and to starting materials for the methods.
A method of preparing a hologram on a substrate, the method comprising: providing a hologram recording medium, the material comprising a carrier bearing a photosensitive hologram recording layer; recording a hologram in said photosensitive hologram recording layer; applying an adhesive to said hologram recording layer; attaching said carrier bearing said hologram recording layer to a substrate using said adhesive; and removing said carrier to leave said hologram recording layer attached to said substrate by said adhesive.
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Citations
38 Claims
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1-19. -19. (canceled)
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20. A method of preparing a hologram on a substrate, the method comprising:
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providing a hologram recording medium, the material comprising a carrier bearing a photosensitive hologram recording layer; recording a hologram in said photosensitive hologram recording layer; applying art adhesive to said hologram recording layer; attaching said carrier bearing said hologram recording layer to a substrate using said adhesive; and removing said carrier to leave said hologram recording layer attached to said substrate by said adhesive. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A holographic recording medium for recording a volume reflection hologram, the recording medium comprising:
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a carrier; a photosensitive hologram recording layer carried by said carrier; wherein mutual attachment of said photosensitive layer and said carrier is enhanced by a surface treatment of said carrier, and wherein said surface treatment is only partially applied to a surface of a said carrier bearing said photosensitive hologram recording layer.
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34. A mounted security hologram system comprising:
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a substrate; a holographic recording layer in which a hologram has been recorded; an adhesive layer attaching said layer to said substrate; wherein said hologram comprises a volume reflection hologram; and wherein said substrate is substantially non-transparent at a wavelength of operation of said holographic recording layer. - View Dependent Claims (36, 37)
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35. A mounted security hologram system comprising:
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a substrate; a holographic recording layer in which a volume reflection hologram has been recorded; an adhesive layer attaching said layer to said substrate; and wherein an image reconstructed by said volume reflection hologram comprises a pseudoscopic image. - View Dependent Claims (38)
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Specification