Optical recording medium and apparatus of judging fake thereof
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United States of America Patent
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Jun 26, 2001
Grant Date -
N/A
app pub date -
Nov 4, 1999
filing date -
Nov 6, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A phase watermark hologram 'W' is composed of a blaze having binary phase difference of 2.pi..times.n, where 'n' is a natural number of more than 1. An watermark appears in response to phase difference, which changes by a faked blaze. A phase watermark hologram 'W' and a phase hologram 'D' indicating data are formed on a same surface of a substrate mixed in arbitrary locations and arbitrary ratio of both holograms.
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