PERFECTED MICRO OPTICAL PROTECTIVE DEVICE Russian patent published in 2013 - IPC B44F1/12 

FIELD: process engineering.

SUBSTANCE: invention relates to micro optical protective device. Protective device comprises substrate, matrix of miniature sewn symbols on or inside said substrate. Note here that every said symbol comprises fragments of two or more patterns of symbols. Note here that sewn symbols are arranged in multiple mutually perpendicular columns and lines. Note also that patterns of symbols or of their part realised in said fragments that compose every sewn symbol shift either downward in every column or along every line. Besides it comprises appropriate matrix of micro lenses arranged, in fact, parallel with sewn symbols matrix with focal points of at least some micro lenses aligned with fragments in sewn symbols. Note here that spacing between matrices is sufficient for micro lenses to form artificially enlarged images of transitions patterns of symbols. Note also that said artificially enlarged images smoothly changes from one image into another and, then, on selection, back into initial image as the device inclines along its horizontal axis or vertical axis.

EFFECT: better protection against counterfeit.

32 cl, 16 dwg