Patent ID: 8187771

Claim:
A process for the production of a multi-layer body having a volume hologram with at least two different items of image information, wherein a single photosensitive layer of the multi-layer body is brought into contact directly or with the interposition of a transparent optical medium with the front side of a master provided on the peripheral surface of a replication cylinder, 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 front side 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; the single photosensitive layer and the master are exposed with a coherent light beam, wherein 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 by hardening of the single photosensitive layer, and wherein the multi-layer body is produced in a roll-to-roll process by a procedure whereby the single photosensitive layer is passed over the replication cylinder, the single photosensitive layer being exposed with the coherent light beam, and wherein an exposure light source and a hardening light source are both provided adjacent the replication cylinder, the exposure light source providing the coherent light beam for exposing the photosensitive layer while in contact with the master of the replication cylinder and the hardening light source providing energy for hardening the photosensitive layer while in contact with the master of the replication cylinder.