FIELD: optics.
SUBSTANCE: device has first and second arrays of lens elements, positioned on first and second surfaces of device. First and second arrays are positioned in such a way, that can be seen when looking at second array through first array. One of arrays includes at least one predetermined and variable jump-like change, while said change occurs in characteristic of at least one of elements of array relatively to analogical characteristic of close element of array. One of elements can include profiled area, providing a cross-section for at least one of elements, which is parallel to surface, on which it is formed, which is of unordered shape in comparison to parallel cross-section of element, which does not include said profiled area. At least one of said arrays can be encoded by at least one predetermined and variable defect, non-detectable for observer.
EFFECT: lens device with variable properties to make it harder to copy.
5 cl, 12 dwg
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