OPTICALLY VARIABLE DEVICE EXHIBITING NON-DIFFRACTIVE THREE-DIMENSIONAL OPTICAL EFFECT
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United States of America Patent
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Mar 13, 2014
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Mar 15, 2013
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Abstract
An optically variable device includes a substrate and a plurality of optical elements formed in or on the substrate and being structured to provide a three-dimensional optical effect for a viewer when light is incident on the optical elements. The plurality of optical elements are arranged as a plurality of stereo pairs structured to reflect or refract light to corresponding focal points in three-dimensional space apart from the optically variable device to form the three-dimensional optical effect. The optical elements include one or more optical elements that are curved structures having a curvature that is either less than or greater than a semi-circle.
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