Security Holograms
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United States of America Patent
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N/A
Issued Date -
Jun 12, 2008
app pub date -
Jan 23, 2006
filing date -
Jan 21, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
This invention relates to improved holograms, in particular suitable for security applications, and to methods and apparatus for their fabrication. A hologram storing a pair of images, the hologram comprising: a first stored image configured to replay at a first wavelength; and a second stored image configured to replay at a second wavelength different to said first wavelength; and wherein said first and second stored images are spatially complementary such that when replayed they appear together, substantially in register, and give the appearance of a single, substantially uninterrupted image.
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