| 摘要 |
PURPOSE:To form the hologram image photographed by a Denisyuk method in such a manner that the interference fringes uncomfortable to eyes are invisible and to greatly improve image quality by reducing the interference fringes to be generated in the reconstructed image to such fineness at which said fringes are hardly visible. CONSTITUTION:The interference fringes to be generated in the reconstructed image of the hologram to be photographed by projecting the luminous flux 2 from a light source 1 as a reference luminous flux to a recording carrier 5 and using the luminous flux 12 transmitted through the recording carrier 5 as the illumination light of an object 6 to be photographed are reduced to the fineness at which the fringes are hardly visible. Namely, the visibility lowers with a decrease in the pitch of the interference fringes. There are substantially no harms for image observation if the fringes are about 2 pieces at 1mm, i.e., if the pitch decreases to <=0.5mm. The harmful interference fringes generated in the reconstructed image of the hologram photographed by the Denisyuk method are, therefore, removed by adequately selecting the thickness of a substrate and providing a suitable wedge angle thereto at the time of printing the hologram.
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