Invisible information recording medium

Details Invisible information recording medium Invisible information recording medium

1994-08-17

1996-07-02

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Luminescent imaging

235491, 430962, G06K 1902

Patent

active

055321046

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.

REFERENCES:
patent: 5210411 (1993-05-01), Oshima et al.
patent: 5331140 (1994-07-01), Stephany
Abstract of JP 6-143746, Ono et al. (May 1994).
Abstract of JP 3-214280, Anjo et al. (Sep. 1991).

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