Diffraction element

Abstract

Abstract A deflecting element (2) on a carrier (5) is a proof of genuineness of a document (1) connected to the carrier (5) and is divided up into sub-surfaces (3, 3<'>). At least a first sub-surface (3) and a second sub- surface (3<'>) have microscopic, asymmetrical relief structures (4) which differ only in an azimuth angle ( PHI ,  PHI <'>). The difference of the azimuth angles ( PHI ,  PHI <'>) is 180 DEG . If the sub-surfaces (3, 3<'>) have a common edge (10) they form a mirror-symmetrical pair (9). Such mirror- symmetrical pairs (9) form visual markings (13) with an outline (14). The markings (13) can be detected by a machine using an optical reader. <IMAGE>

Inventors

• 👤 Gregor Antes

Bibliographic Details