APPARATUS AND METHODS FOR MAKING TRANSMISSION HOLOGRAMS

摘要

Apparatus and methods are provided for mass production of transmission holograms onto a continuous web (30) of photosensitive material, one method involving the mounting of a master transmission hologram (34) onto the outside surface of a clear hollow drum (20), the clear hollow drum being rotatable and having means (24) for directing an irradiating wavefront propagated from a radiation source (70) through the master transmission hologram (34) onto a passing recording medium (30) in a predetermined direction, the directing means (24) configured so that said predetermined direction is fixedly maintainable independent of the rotation of the hollow drum (20) and the master transmission hologram (34) mounted thereon. The redirected irradiating wavefront transmitted through the master transmission hologram (34) generates an object beam and a "zero order" reference beam, said object beam and "zero order" reference beam combine to form an interference pattern, the interference pattern being recorded on the photosensitive recording medium (30).