Label for receiving indicia having variable spectral emissivity values
First Claim
1. A label, said label comprising:
- a substrate having a first side and a second side;
an indicium located on said substrate;
said indicium comprising at least two different emissivity values that are configured to encode said indicium with information;
a thermally conductive layer located on said first side of said substrate, wherein said thermally conductive layer ensures that a detected difference in surface temperature corresponds with a difference in said emissivity values; and
a background layer located on said first side of said substrate.
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Abstract
Labels that are conducive to the detection of bar-codes and other indicia having varying spectral emissivity values are provided. The labels include a substrate, a background layer, a thermally conductive layer and an adhesive layer. The background layer is preferably similar in visual appearance to the indicium that the label is to receive. Meanwhile, the thermally conductive layer is made from a material with high thermal conductivity that is used to substantially equalize the temperature across the label surface, thereby enabling a faster and cheaper detection of transitions of differential emissivity on the indicium surface. The adhesive layer is used for attaching the label to a document or other product.
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Citations
31 Claims
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1. A label, said label comprising:
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a substrate having a first side and a second side; an indicium located on said substrate; said indicium comprising at least two different emissivity values that are configured to encode said indicium with information; a thermally conductive layer located on said first side of said substrate, wherein said thermally conductive layer ensures that a detected difference in surface temperature corresponds with a difference in said emissivity values; and a background layer located on said first side of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A label comprising:
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a substrate having a first side and a second side; a thermally conductive layer located on said first side of said substrate, wherein said thermally conductive layer ensures that a detected difference in surface temperature corresponds with a difference in said emissivity values; a background layer located on said first side of said substrate; a first pattern having a first emissivity value at a given range of wavelengths; and a second pattern having a second emissivity value at said given range of wavelengths, said first and second patterns that combine to form a sequence of differential emissivity values at said given range of wavelengths.
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23. A label comprising:
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a substrate having a first side and a second side; an indicium, located on said substrate, comprising at least two different emissivity values that are configured to encode said indicium with information; and a thermally conductive layer located on said first side of said substrate, wherein said thermally conductive layer ensures that a detected difference in surface temperature corresponds with a difference in said emissivity values, and wherein said indicium is not distinguishable by the naked eye from the remainder of said label. - View Dependent Claims (24, 25)
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26. A label for use with a product, said label comprising:
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a substrate having a first side and a second side, said substrate is part of said product; an indicium, located on said substrate, comprising at least two different emissivity values that are configured to encode said indicium with information; a thermally conductive layer that is applied to said first side of said substrate, wherein said thermally conductive layer ensures that a detected difference in surface temperature corresponds with a difference in said emissivity values; and a background layer that is applied to said first side of said substrate.
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27. A method for producing a label, said method comprising:
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providing a substrate having a first side and a second side; locating an indicium on said substrate, said indicium comprising at least two different emissivity values that are configured to encode said indicium with information; applying a thermally conductive layer to said first side of said substrate to ensure that a detected difference in surface temperature corresponds with a difference in said emissivity values; and applying a background layer to said first side of said substrate. - View Dependent Claims (28, 29, 30, 31)
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Specification