Optically effective surface relief microstructures and method of making them
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United States of America Patent
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Sep 23, 2014
Grant Date -
Jul 16, 2009
app pub date -
May 7, 2007
filing date -
May 7, 2007
priority date (Note) -
Withdrawn
status (Latency Note)
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Abstract
The present invention relates to an element comprising a surface area with a specific, optically effective surface relief microstructure (12). The surface relief microstructure has a surface modulation of top regions (13) and bottom regions (14), wherein in a first lateral direction of the surface area there is in average at least one transition from a top to a bottom region or vice versa within every 20 micrometer, and in a second lateral direction of the mask, which is perpendicular to the first direction, there is in average at least one transition from a first to a second zone or vice versa within every 200 micrometer. In the microstructure, (i) in the first direction the lateral arrangement of the transitions is non-periodic, and (ii) the top regions substantially lie in the same top relief plateau (15) and the bottom regions substantially lie in the same bottom relief plateau (16).
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