Optical films for creating unique optical effects
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United States of America Patent
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Nov 20, 2007
Grant Date -
Oct 7, 2004
app pub date -
Mar 22, 2004
filing date -
Mar 24, 2003
priority date (Note) -
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Abstract
An optical layer comprises a sheet of material having a surface. The surface comprises a plurality of optical elements. The optical elements are comprised of microscopic patterns in the surface that cooperate to produce an image. Each of the elements has a focal length. At least some of the focal lengths are significantly different from other focal lengths, such that some portions of the surface appear to be closer to a viewer than other portions of the surface.
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