INFORMATION CARRIER WITH DIFFRACTION STRUCTURES

摘要

An information carrier has at least one diffraction pattern which is formed from microscopically fine relief structures and which upon being illuminated with coherent light produces in two spatially separate directions a first and a second image of an object. The images can be rendered visible on a screen or analysed by means of photodetectors. The two images have strong-light and/or comparatively weak-light picture elements and include a symmetry insofar as a weak-light picture element of the second image can be associated with a strong-light picture element of the first image and vice-versa. Such information carriers are suitable as security elements for documents of all kinds such as for example banknotes, passes, identity cards, credit cards etc., wherein at least a part of the security information is not visible under incoherent illumination conditions.