Process for realization of an optically variable image
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United States of America Patent
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Sep 15, 1998
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N/A
app pub date -
Feb 15, 1996
filing date -
Mar 3, 1994
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Abstract
Method for the production of an optically variable image including an animated element used as the model for the reproduction of a security element, by insolation of a light-sensitive material through two coherent light beams. The image is broken down into a plurality of elementary images, each corresponding to an optical effect defined by a color, the time when the image elements appear and their duration. A plurality of masks is provided, each including a number of windows defining an elementary image. Two light beams are used to light the entire substrate surface and the substrate is isolated by successively placing each mask on the substrate and in the path of the light beams. The first light beam is stationary while the second light beam is emitted from an illumination surface with adjustable dimensions and position, so as to produce a given optical effect for each elementary image.
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