Non-continuous holograms, methods of making them and articles in

Details Non-continuous holograms, methods of making them and articles in Non-continuous holograms, methods of making them and articles in

1990-06-25

1992-07-07

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Authentication

283 86, 283 93, 359572, G02B 518, B42D 1500

Patent

active

051287790

ABSTRACT:
Non-continuous reflective holograms or diffraction gratings are provided in various forms for authenticating documents and things, and for decorative and product packaging applications. In one specific authentication application, such a hologram or diffraction grating is firmly attached to a surface that contains visual information desired to be protected from alteration. Examples of such information include written personal data and photograph on a passport, driver's license, identity card and the like. The reflective discontinuous hologram is formed in a pattern that both permits viewing the protected information through it and the viewing of an authenticating image or other light pattern reconstructed from it in reflection. In another specific authentication application, a non-transparent structure of two side-by-side non-continuous holograms or diffraction patterns, each reconstructing a separate image or other light pattern, increases the difficulty of counterfeiting the structure.

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