Secured document, system for manufacturing same and system...

Details Secured document, system for manufacturing same and system... Secured document, system for manufacturing same and system...

2005-03-29

2005-03-29

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

C283S086000

Reexamination Certificate

active

06873443

ABSTRACT:
A document includes at least one drawing or data produced, for example, by printing. In addition, this document includes a hologram representing part of the document. The hologram of this document is recorded using a system including a prerecorded or electrically controllable optical modulator in which the image of at least part of the document is recorded. This modulator is designed to be combined with a layer of photosensitive material. A first reference wave illuminates the layer of photosensitive material. A second wave incident on the modulator and giving rise to a third object wave is also transmitted to the layer of photosensitive material in order to interfere with the reference wave in this layer.

REFERENCES:
patent: 3894756 (1975-07-01), Ward
patent: 4171864 (1979-10-01), Frank et al.
patent: 5483363 (1996-01-01), Holmes et al.
patent: 0 283 233 (1988-09-01), None
patent: 2196443 (1988-04-01), None
patent: 2 254 166 (1992-09-01), None

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