Invisible information recording medium
First Claim
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1. An invisible information recording medium comprising:
- (a) an underlying layer;
(b) an invisible information recording layer which is provided above said underlying layer, is invisible under visible light, and generates fluorescent light upon being contacted with light having a particular wavelength, except for visible light, thus becoming visible; and
(c) an optical modulation layer provided between said underlying layer and said invisible information recording layer, and optically modulating the fluorescent light which is generated in said invisible information recording layer and is emitted on said optical modulation layer.
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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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12 Claims
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1. An invisible information recording medium comprising:
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(a) an underlying layer; (b) an invisible information recording layer which is provided above said underlying layer, is invisible under visible light, and generates fluorescent light upon being contacted with light having a particular wavelength, except for visible light, thus becoming visible; and (c) an optical modulation layer provided between said underlying layer and said invisible information recording layer, and optically modulating the fluorescent light which is generated in said invisible information recording layer and is emitted on said optical modulation layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification