Patent ID: 8599458

Claim:
Method for producing volume transmission and/or reflection holograms on a photosensitive film having a backing foil, a holographic layer and a protective film, wherein the film is guided over a drum, brought in contact with a master hologram on the drum and moved through an exposure zone together with the master hologram, in which zone the film and the master hologram are irradiated with a linearly expanding exposure laser beam for reproducing the master hologram in the photopolymer layer, wherein there is only one drum and both reflection and transmission volume holograms are produced simultaneously or individually in the photopolymer layer of the film guided over the drum dependent upon two master holograms that are present either simultaneously or individually at least at the exposure zone of the drum, wherein the master holograms are moved synchronously with the drum and with the film overlying the drum and the first master hologram is located radially on the outside surface of the film and the second master hologram is applied on the drum radially on the inside surface of the film; wherein the laser beam traverses at least one of the master holograms twice before irradiating the film.