Transparent optical identification label with infrared directivity
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United States of America Patent
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Apr 5, 1994
Grant Date -
N/A
app pub date -
Jan 27, 1992
filing date -
Sep 11, 1991
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Abstract
An optical identification label consisting of an area of hologram or diffraction grating which is transparent to visible light but reflects incident light with a specific reflective directivity. By identifying the reflectivity directivity, it is possible to identify the authenticity of the label and, hence, the object to which the identification label is affixed. The fact that the identification label is transparent to human eyes offers a strong discouraging effect on potential forgers. Further, the pattern of the reflected light may be used as means for encoding data.
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