Structure arrangement, in particular for a security element
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Mar 26, 1997
filing date -
Oct 11, 1994
priority date (Note) -
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Abstract
A structural arrangement having optical diffraction qualities for use as a security element in a value bearing document, such structural arrangement having a plurality of surface regions having at least two subregions having identical relief structures which provide for an optical diffraction effect, the relief structures of adjacent subregions being displaced relative to each other by a fraction of the grating period.
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