IMITATION RESISTANCE HOLOGRAM AND PRODUCTION OF THE IMITATION RESISTANT HOLOGRAM AND ITS APPARATUS

摘要

PURPOSE: To make formation of a hologram by imitating a subject difficult, to facilitate discrimination o an imitation and to improve imitation resistance. ;CONSTITUTION: The hologram is produced by branching a laser beam to three directions by an optical system 2 for branching light, irradiating a dry plate 8 for hologram with one of the branched beams as a reference beam, irradiating master holograms 13, 16 for a main image and a sub-image with the other branched beams, generating the object beam of the main image, irradiating the dry plate 8 for hologram with this object beam and irradiating the dry plate 8 for hologram with the object beam of the sub-image from a direction symmetrical with the object beam of the main image with the reference beam as a center. The main image and the pseudoscopic sub-image are observed as reconstructed images when this hologram is reconstructed.;COPYRIGHT: (C)1995,JPO