Patent ID: 7940340
Filing Date: 2011-05-10
Classification: B42D,G02F,G03H

Abstract:
1. A multilayer body comprising: an optically variable device (OVD) active first layer system having at least a diffractive optical effect; and an electrically controllable second layer system for influencing the optical effect of the first layer system and arranged above the first layer system, the first layer system including a metallic reflective layer forming a lower electrode layer of the second layer system and exhibiting said at least diffractive optical effect; wherein the first layer system comprises a relief structure and a metallic reflective lower electrode layer on the relief structure, which relief structure and lower electrode layer extend generally in a given direction, the relief structure comprising projections extending normal to the given direction and which projections alternate with diffraction gratings forming the diffractive optical effect in the given direction.