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US 5,815,292 AGranted
Low cost diffraction images for high security application
AssigneeAdvanced Deposition Technologies, Inc.
InventorGlenn J. Walters
Life of this patent
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Abstract
A security device includes two plastic layers and a metal layer. The plastic layers may be embossed or surface cast with contrasting surface relief diffraction patterns. A second metal layer may be provided including a pattern of voids through which the first metal layer may be seen by a human observer.
Claims21
A security device, comprising:
- a first plastic film having a surface relief diffraction pattern on a first surface thereof;
- a first metal layer disposed on the first plastic film;
- a second plastic film laminated to a structure including the first plastic film and the first metal layer;
- and
- a second metal layer which is reflective everywhere except where an aperture therethrough has an edge which defines an outline of an image seen as a reflection of the first metal layer, the second metal layer disposed on the second plastic film.
2 more elements
A security device, comprising:
- a first plastic film having a surface relief diffraction pattern on a first surface thereof;
- a first metal layer disposed on the first plastic film;
- a second metal layer which is reflective everywhere except where an aperture therethrough has an edge which defines an outline of an image seen as a reflection of the first metal layer, the second metal layer disposed on the first plastic film, the first and second metal layers disposed on the first and second surfaces of the first plastic film, respectively, and a second plastic film laminated to a structure including the first plastic film and the metal layers.
Dependencies are inferred from the claim text.