Optical security marking component, method of manufacturing such a component, system comprising such a component, and reader for checking such a component
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United States of America Patent
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Jul 16, 2013
Grant Date -
Jul 30, 2009
app pub date -
May 2, 2007
filing date -
May 2, 2006
priority date (Note) -
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Abstract
The present invention relates to an optical security marking component producing a first visible configuration when observed through a polarizer oriented in a first orientation, and a second configuration, separate from the first, visible when observed through the polarizer oriented in a second orientation, the optical component comprising a stamped film for forming at least two diffraction gratings having different orientations, characterized in that each of said gratings has a period of less than 550 nm and a modulation between 0.25 and 0.5 relative to a reference plane.
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