Multi-layer body with volume hologram

A composite comprising:

• a master for the production of a volume hologram having at least two different items of image information in the optical contact process, wherein, shaped in a master layer of the master, are interlaced regions having at least two different image information surface structures which respectively contain the at least two different items of image information, wherein at least one of the image information surface structures has an asymmetrical relief structure or a kinoform structure, and wherein the master layer of the master further has background surface structures which do not contain any image information, said background surface structures being in the form of a motheye structure and/or in the form of a mirror and/or in the form of a matt structure and/or in the form of a scatter grating;
• and
• a single photosensitive layer without a supporting substrate is in contact directly or with the interposition of a transparent optical medium with the master, wherein the single photosensitive layer is at least partially hardened, and the hardened photosensitive layer and the master are exposed with a coherent light beam prior to the application of a carrier substrate for the photosensitive layer, whereby the light beam is deflected by the at least two different image information surface structures of the master to cause local polymerization of the single photosensitive layer, whereby at least two position-dependent three-dimensional refractive index patterns are stored in the single photosensitive layer in the form of a volume hologram having at least two different items of image information, and the volume hologram introduced into the single photosensitive layer in that way is fixed.

A process for the production of a multi-layer body having a volume hologram with at least two different items of image information, the process comprising the steps of:

• providing a replication cylinder having a master arranged on a peripheral surface thereof, the master having shaped interlaced regions with at least two different image information surface structures which respectively contain the at least two different items of image information, wherein at least one of the image information surface structures has an asymmetrical relief structure or a kinoform structure, and wherein the master further has background surface structures which do not contain any image information, said background surface structures being in the form of a motheye structure and/or in the form of a mirror and/or in the form of a matt structure and/or in the form of a scatter grating;
• passing a single photosensitive layer over the master of the replication cylinder using a roll-to-roll process whereby the single photosensitive layer is brought into contact directly or with the interposition of a transparent optical medium with the master;
• exposing the single photosensitive layer and the master with a coherent light beam provided by an exposure light source disposed adjacent the replication cylinder, wherein the light beam is deflected by the at least two different surface structures of the master to cause local polymerization of the single photosensitive layer while in contact with the master of the replication cylinder, whereby at least two position-dependent three-dimensional refractive index patterns are stored in the single photosensitive layer in the form of a volume hologram having at least two different items of image information;
• hardening the single photosensitive layer with a hardening light source disposed adjacent the replication cylinder, the hardening light source providing energy for hardening the photosensitive layer while in contact with the master of the replication cylinder to fix the volume hologram introduced therein;
• and
• laminating the single photosensitive layer with a substrate to form a multi-layer body.