Patent ID: 6157487
Filing Date: 2000-12-05
Classification: B42D

Abstract:
An optically variable surface pattern, comprising:juxtaposed areas subdivided into reflective surface portions, each of the reflective surface portions comprising one of a diffracting grating structure, a matte structure and a non-inclined flat mirror surface;a laminate in which said reflective surface portions are embedded;representations of graphic configuration which include at least light and dark image regions, the reflective surface portions corresponding to the light image regions being comprised of the diffracting grating structure associated with a particular one of the representations such that the representations are visible at different viewing directions upon being illuminated by visible light; andthe light image regions of at least one representation comprised of the reflective surface portions having a first grating structure with a line number of between about 100 and 250 lines per millimeter and with a profile height such that upon being illuminated, the light image regions of said at least one representation appear achromatically bright within at least one first cone with a predetermined first solid angle and appear achromatically dim outside of the first cone.