| 摘要 |
PROBLEM TO BE SOLVED: To provide a fabrication process for a computer-generated hologram that is easy to view and excels in security, and to provide a computer-generated hologram fabricated by that process. SOLUTION: The fabrication process for a computer-generated hologram 1 in which amplitude information and phase information are recorded on a given recording surface by means of computation by a computer is characterized in that: the computer-generated hologram 1 includes a first direction X and a second direction Y orthogonal to the first direction X and a parallax in the first direction X alone; the hologram 1 includes unit areas B1, B2, B3, ..., Bm, ..., BM each one having a given width in the second direction Y; and in each unit area B1, B2, B3,..., Bm,..., BM, there is a diffraction pattern fabricated having a spatial frequency Cm1, Cm2, Cm3, ..., Cmt, ..., CmT that varies in the second direction. COPYRIGHT: (C)2009,JPO&INPIT |
