SECURITY DEVICE Russian patent published in 2018 - IPC B41M3/14 

FIELD: protective devices.

SUBSTANCE: security device comprising: an array of lines printed or otherwise provided on a substrate, the lines comprising materials which have the same appearance under visible light illumination, but which appear different from each other in the visible range under a combination of visible and non-visible, ultraviolet illumination. At least some of the lines in the array appear different from other lines under the combination of visible and non-visible, ultraviolet illumination. Second, surface relief array of lines is imposed on the first array. Orientation, line widths and spacings of the first and second arrays are selected such that the device exhibits a variable appearance as it is tilted while exposed to the combination of visible and non-visible illumination.

EFFECT: security device is disclosed.

34 cl, 16 dwg