HOLOGRAM, GENERATING METHOD FOR ITS HOLOGRAM, AND METHOD AND DEVICE FOR CONFIRMATION USING SAME

PURPOSE:To increase the amount of information recorded in a hologram, and to enhance a forgery preventing effect by combining and forming integrally a reflection type hologram or a reflection type interference filter and a transmission type hologram. CONSTITUTION:As for a transmission type hologram...

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Bibliographic Details
Main Author KUWABARA YUKO
Format Patent
LanguageEnglish
Published 28.04.1994
Edition5
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHIC PROCESSES OR APPARATUS
HOLOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PURPOSE:To increase the amount of information recorded in a hologram, and to enhance a forgery preventing effect by combining and forming integrally a reflection type hologram or a reflection type interference filter and a transmission type hologram. CONSTITUTION:As for a transmission type hologram 1a, that of a relief type, or a transmission type volume phase hologram is used. Also, as for a reflection type phase hologram or a reflection type interference filter 1b, that of a lipman type is used, and they are combined and formed integrally. In such a state, for instance, when a reproducing light is radiated by a light source 2 from a reflection type hologram 1 side, a reflection diffracted light 3, and a transmission diffracted light 4 are diffracted by the reflection type hologram 1, and the transmission type hologram 1a, respectively, and by detecting them, the amount of information is increased, and a forgery preventing effect is enhanced. In this regard, when the intensity of the respective reproducing light of the reflection type hologram 1 and the transmission type hologram 1a is too different, reproduction of a distinct image is hindered, therefore, as for an intensity ratio of the reproducing light, it is set to 0.5-1.5.
Bibliography:Application Number: JP19920271631