Patent ID: 8840146
Filing Date: 2014-09-23
Classification: B29D,B42D,G02B

Abstract:
1. Element having at least one surface area with an optically effective surface relief microstructure, which surface relief microstructure has a surface modulation of transitions from top regions to bottom regions and from bottom regions to top regions, wherein at least in one lateral direction of the surface area there is at least one transition from a top region to a bottom region or vice versa within every 20 micrometers, characterized in that (i) the lateral arrangement of the transitions is non-periodic, and (ii) the top regions substantially lie in a top relief plateau and the bottom regions substantially lie in a bottom relief plateau, such that a relief modulation depth is substantially equal over the surface area, characterized in that at least in one lateral direction of the surface area the average lateral distance between adjacent transitions from a top region to a bottom region or vice versa lies in the range from 0.2 micrometer to 10 micrometers, and the surface relief microstructure is anisotropic.