FIELD: physics, computer engineering.
SUBSTANCE: disclosed protective device with indication of unauthorised tempering is based on the principle of creating one or more synthetic images. The device is an optical film material which consists of at least one layer containing focusing elements, at least one layer containing image elements and at least one optical splitter or a layer of splitters located between at least one layer of focusing elements and at least one layer of image elements. The focusing elements form one or more synthetic images of at least part of the image elements. The image elements are microstructures in the form of voids or depressions in a polymer substrate, or in the form of protruding portions or moulded columns. The device splits up or delaminates upon an attempt at separating the device from the main material, making the device partially or completely non-operable.
EFFECT: disclosed group of inventions provide protection from unauthorised tempering.
43 cl, 17 dwg
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