Optical structure, in particular for a security document and/or a document of value
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United States of America Patent
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May 14, 2013
Grant Date -
May 14, 2009
app pub date -
Nov 16, 2006
filing date -
Nov 16, 2005
priority date (Note) -
Expired
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Abstract
An optical structure comprising first and second opposite outside faces, at least a first interface comprising a first screen of microreliefs and arranged in such a manner that travel through the first interface from the first outside face towards the second outside face, passes from a first medium having a first refractive index to a second medium having a second refractive index that is greater than the first, and at least one second interface comprising a second screen of microreliefs and arranged in such a manner that travel through the second interface from the first outside face towards the second outside face, passes from a third medium having a third refractive index to a fourth medium having a fourth refractive index less than the third.
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