Invisible information recording medium
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United States of America Patent
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-
Jul 2, 1996
Grant Date -
N/A
app pub date -
Aug 17, 1994
filing date -
Aug 19, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An invisible (stealth) information recording medium includes an underlying layer, an invisible information recording layer provided above the underlying layer, being invisible under visible light, and generates light upon being contacted with light having a particular wavelength except for visible light, thus becoming visible, and an optical modulation layer provided between the underlying layer and the recording layer, and optically modulating the fluorescent light which is generated in said invisible information recording layer and is emitted on the optical modulation layer.
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