Patent ID: 7724408
Filing Date: 2010-05-25
Classification: B42D,G07D

Abstract:
1. Security system for a security document, said security system comprising; a flat security element in a carrier plane that under incident light holographically reconstructs outside the carrier plane a pattern in which concealed information is stored, and with a flat at least partly transparent verification element which on flat contact with the security element makes the information stored therein readable, wherein the security element comprises a first hologram carrier which under incident light reconstructs outside the carrier plane an amplitude-modulated pattern which carries a recognizable first part of the previously concealed information, and the verification element comprises a second hologram carrier which under incident light reconstructs outside the carrier plane an amplitude-modulated pattern carrying the recognizable remainder of the previously concealed information such that when light is incident simultaneously on both hologram carriers in the superposed state, both patterns are reconstructed and combine to give recognizable information.