Method for using a deep image hologram as a security device...

Details Method for using a deep image hologram as a security device... Method for using a deep image hologram as a security device...

2004-08-27

2009-08-18

Lavarias, Arnel C (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

C430S010000, C283S086000

Reexamination Certificate

active

07576898

ABSTRACT:
A holographic optical element (HOE) that includes a deep image hologram and a method for using this HOE as a security device are described. The deep image hologram is viewable with a collimated or at least partially collimated light source having a center wavelength in the visible region of the electromagnetic spectrum and a spectral bandwidth, wherein the spectral bandwidth of the collimated or at least partially collimated light source at least partially overlaps the spectral bandwidth of the deep image hologram. The deep image hologram is not viewable (i.e., appears essentially unrecognizable to the human eye) with a diffuse lighting source, such as ordinary room lighting.

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