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US 9,594,345 B2Granted
Hybrid reflection hologram
AssigneeDiARTs AG S.A.
InventorKen R. Harris
Life of this patent
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AssigneeDiARTs AG S.A.
InventorKen R. Harris
Estimating the term…
Hybrid white-light viewable holograms and methods for making them. The holograms are hybrid reflection holograms made using the diffractive structures or gratings of a holographic object such as a transmission hologram or holographic optical element (HOE). The wavefronts of the diffractive structures are converted into a reflection hologram by scanning them with a coherent light source having a profiled narrow beam. The hybrid reflection hologram can exhibit display parameters including the multiple colors, solidity, and color stability of white light reflection holograms, the diffractive color shifting of a white light transmission hologram, three dimensional imaging and a wide variety of dynamic changes. Different areas or images with each of these effects can be combined in a single hologram. These hybrid reflection holograms are ideal for security and forgery prevention applications.
A reflection hologram comprising one or more hologram areas which exhibit controlled color changes that shift or change to a different color as a viewing angle is changed when viewed in white light comprising a plurality of wavelengths, at least one non-stereogram hologram area that does not exhibit color shifting as a viewing angle is changed when viewed in light comprising a range of wavelengths, and information stored throughout an emulsion layer, and wherein said reflection hologram does not comprise a reflective backing.
A reflection hologram comprising at least one area exhibiting color stability or limited color shifting, including one or more non-stereogram first areas comprising one or more single, nonshifting colors and one or more second areas that exhibit controlled color changes that shift or change to a different color when a viewing angle is varied when viewed in white light comprising a plurality of wavelengths, and additionally comprising information stored throughout an emulsion layer, and wherein said reflection hologram does not comprise a reflective backing.
Dependencies are inferred from the claim text.