Security hologram with covert messaging

Details Security hologram with covert messaging Security hologram with covert messaging

1996-04-23

1998-04-21

Henry, Jon W.

Optical: systems and elements

Holographic system or element

Authentication

283 91, 283 94, 283902, G03H 100, B42D 1510

Patent

active

057424110

ABSTRACT:
A security device includes a holographic image observable in ambient light and through which a covert image is observable in a focussed beam of bright light, such as a flash light. The holographic image is coated with a metal layer of low optical density, while the covert image is produced by a metal layer of high optical density disposed away from an observer relative to the holographic image. The covert image may itself be amplified by positioning the high optical density layer on a layer of micro prisms.

REFERENCES:
patent: 5080463 (1992-01-01), Faykish et al.
patent: 5145212 (1992-09-01), Mallik
patent: 5510171 (1996-04-01), Faykish
patent: 5513019 (1996-04-01), Cueli
patent: 5591527 (1997-01-01), Lu
"Label gives boot to bootlegged disks in Asia", Packaging Digest, Mar. 1996 .

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