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US 5,513,019 AGranted
Semi-transparent reflective layer for a phase hologram
AssigneeCrown Roll Leaf, Inc.
InventorPeter Cueli
Life of this patent
Estimating the term…
Abstract
A phase hologram is embossed in a mylar web having a reflective layer which is made from tin tungsten oxide, zinc sulfide, or a mixture thereof. The embossed microtexture produces a hologram that is semi-transparent, thereby allowing the visualization of indicia underlying the hologram.
Claims23
A phase hologram, comprising:
- (a) a substrate having a holographic microtexture embossed therein on at least a portion of a surface thereof;
- and
- (b) a reflective layer of a mixture of tin tungsten oxide and zinc sulfide deposited upon said embossed microtexture said reflective layer having a refractive index different from that of said substrate and being at least semi-transparent.
A method for producing holograms, comprising the steps of:
- (a) embossing a substrate with a holographic microtexture on at least a portion of a surface thereof;
- and
- (b) depositing a reflective layer of a mixture of tin tungsten oxide and zinc sulphide upon said embossed microtexture, said reflective layer having a refractive index different from that of said substrate and being at least semi-transparent.
An authenticated document, comprising:
- (a) a substrate bearing encoded data;
- and
- (b) a holographic overlay affixed to said substrate overlying at least a portion of said encoded data to prevent non-destructive separation of said overlay from said substrate, said overlay being at least semi-transparent to permit visualization of said encoded data through said overlay and comprising a reflective layer comprising tin tungsten oxide and zinc sulfide.
Dependencies are inferred from the claim text.