Holograms embossed into metal surfaces
First Claim
Patent Images
1. A method of forming a hologram in a surface of aluminum, comprising:
- forming a metal master hologram containing fine grooves corresponding to an interference pattern formed by intersecting two coherent beams with each other at a finite angle therebetween, one of said beams carrying information of an object.heating said aluminum surface, andimpressing the grooves of said metal master hologram against said aluminum surface while heated, thereby to form a hologram in said surface from which said object information may be viewed.
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Abstract
A process for embossing diffraction patterns and holograms directly onto surfaces of metal material, such as aluminum, and products made thereby. Temperature ranges for optimizing the embossing are disclosed, being related to the yield strength of the material being embossed. End products include household aluminum foil with embossed holograms, and aluminum beverage cans with an embossed hologram on its outside.
61 Citations
9 Claims
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1. A method of forming a hologram in a surface of aluminum, comprising:
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forming a metal master hologram containing fine grooves corresponding to an interference pattern formed by intersecting two coherent beams with each other at a finite angle therebetween, one of said beams carrying information of an object. heating said aluminum surface, and impressing the grooves of said metal master hologram against said aluminum surface while heated, thereby to form a hologram in said surface from which said object information may be viewed.
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2. A method of forming a diffraction grating in a surface, comprising:
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selecting a metal having a yield strength that rapidly decreases as a function of its temperature over a given small increasing temperature range while decreasing much more gradually over a higher adjacent temperature range, heating the selected metal to a temperature that is substantially at least that of a higher portion of said given range but significantly less than a temperature which causes the metal to become plastic, and embossing a two-dimensional diffractive pattern into a surface of said metal while being so heated. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification