One way holograms

Details One way holograms One way holograms

1994-08-31

1996-05-21

Lerner, Martin

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 13, 359 25, G03H 104, G03H 126

Patent

active

055195164

ABSTRACT:
A hologram structure including a hologram layer including a half-tone pattern of transparent areas and reflection hologram areas, and a non-hologram half-tone pattern of areas that are substantially opaque to the range of wavelengths that comprises the spectral bandwidth of the holograms areas located adjacent the hologram layer, wherein the hologram areas are superimposed with selected areas of the non-hologram half-tone pattern.

REFERENCES:
patent: 5196951 (1993-03-01), Wreede
patent: 5267060 (1993-11-01), Colton
patent: 5289298 (1994-02-01), Smith
patent: 5347435 (1995-09-01), Smith et al.
patent: 5453339 (1995-09-01), Frost et al.
patent: 5455692 (1995-10-01), Wreede

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