RELIEF MICROSTRUCTURES OF SURFACE WITH OPTICAL EFFECTS AND METHOD OF MAKING SAID MICROSTRUCTURES Russian patent published in 2011 - IPC G02B5/02 

FIELD: physics.

SUBSTANCE: relief microstructure of the surface has protrusions and depressions, where in the first cross direction of an area of the surface there is an average of at least one transition from a protrusion to a depression or vice versa in every 20 mcm, and in the second cross direction of a pattern which is perpendicular to the first direction, there is an average of at least one transition from a first zone to a second zone or vice versa in every 200 mcm. The microstructure is characterised by that in the first direction the lateral arrangement of transitions is non-periodic and that protrusions mainly lie in the same top relief plateau and the depressions mainly lie in the same bottom relief plateau. Due to scattering effects, the surface relief microstructures are suitable for displaying images with a sharp transition between negative and positive images.

EFFECT: well distinguished and saturated image colours and absence of rainbow colours.

18 cl, 39 dwg