Machine-readable optical security device
AssigneeCrane Co.
InventorsNancy J. Gettens, Nicholas G. Pearson, Eric M. Ziegler
Life of this patent
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Abstract
An IR and/or UV machine-readable optical security device (e.g., micro-optic security thread) that is made up of at least one IR-absorbing component with a characteristic IR signature detectable at two or more IR-wavelengths, at least one UV-absorbing component with a characteristic UV signature detectable at two or more UV-wavelengths, at least one IR-absorbing component that absorbs IR light and emits light at a different invisible wavelength, at least one UV-absorbing component that absorbs UV light and emits light at a different invisible wavelength, or a combination thereof, is provided. The IR and UV machine-readable features do not interfere with the optical effects projected by the optical material.
Claims13
A machine-readable optical security device (MrOSD) comprising:
- a multi-layer optical security device (OSD) comprising:
- a spacer layer comprising a first side and a second side;
- a layer of focusing elements disposed on the first side of the spacer layer;
- an array of image elements disposed on the second side of the spacer layer, wherein a synthetic image is projected by the array of image elements when viewed through the layer of focusing elements;
- and
- a machine-readable component (Mr-component) coupled to the spacer layer on the second side of the spacer layer at a density between 0.5 grams per square meter (“g/sm”) to 5 gsm,
- wherein the array of image elements comprises a cured radiation curable polymer mixture,
- wherein the Mr-component comprises at least one of a machine readable phthalocyanine taggant added to the cured radiation curable polymer mixture prior to curing, wherein the machine readable phthalocyanine taggant comprises 30-70% by weight of an ink vehicle added to the radiation curable polymer mixture,
- wherein the Mr-component does not interfere with the synthetic image, and
- wherein the Mr-component absorbs light at a first wavelength in a non-visible spectrum, and emits light at a second wavelength in the non-visible spectrum.
Dependencies are inferred from the claim text.