DEVICE FOR PRODUCTING INDIVIDUAL HOLOGRAM FOR KEEPING DOCUMENT SECRECY

摘要

PROBLEM TO BE SOLVED: To produce a device for producing holograms from a master hologram of a frosted glass screen where one or more than two wavelengths and one or more than two reference angles are recorded. SOLUTION: If the master hologram is used, three-dimensional individual color hologram is produced by a contact printing method. The device has a master H2 and the radiation source which is used to irradiate a film 7 with laser radiation beams 6 and 8. In order to produce the holograms having mutually different information employing a simple method, the modulation device, which conducts the modulation of the coherent beams 6 and 8, especially an LCD is used.