Method and element for holographic replication
AssigneeE. I. Du Pont de Nemours and Company
InventorsArthur John Taggi, Mark Leaman Armstrong
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Abstract
A method is disclosed for replicating (copying) a master hologram into a photosensitive layer to produce a copy of the hologram in a manner such that the copy of the hologram is an accurate and true replication of the master hologram with minimum interface-related defects. A holographic element containing a master hologram for use in contact copying is also disclosed.
Claims15
A method for copying a hologram comprising:
- (a) placing a photosensitive element in contact with an outer surface of a holographic element containing a master hologram;
- the photosensitive element comprising a photosensitive layer disposed adjacent a cover sheet, wherein placing step is performed by placing the outer surface of the holographic element in contact with the surface of the cover sheet opposite the photosensitive layer;
- and
- (b) exposing the photosensitive element and the holographic element to a coherent light beam whereby a replicate of the hologram is formed in the photosensitive element;
- characterized in that the placing step is performed with the outer surface of the holographic element having a matte surface with a surface roughness measured by profilometry in the range from 5 to 200 nanometers and has a specular reflectance of at least five percent.
A holographic element containing a master hologram for use in contact copying to produce a replicate of the hologram wherein an outer surface of the element has a matte surface with a surface roughness measured by profilometry in the range from 5 to 200 nanometers, the element comprising an optically transparent layer disposed directly adjacent the master hologram wherein the surface of the optically transparent layer opposite the master hologram comprises the outer surface of the element and has a specular refelectance of at least five percent.
Dependencies are inferred from the claim text.