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AssigneeDai Nippon Printing Co., Ltd.
InventorsTsuyoshi YAMAUCHI, Masachika WATANABE, Tomoko KUMASAWA, Makio KURASHIGE, Akiko KITAMURA, Mitsuru KITAMURA, Kenji UEDA
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The invention relates to a process by which a multi-image type hologram wherein one 3D image changes over to another depending on a viewing direction can be fabricated in simple construction and a multi-image type hologram fabricated by that process. According to the process for the fabrication of a multi-image type hologram wherein one image changes over to another depending on a viewing direction, the area of a hologram recording material is divided into a plurality of sub-areas 111, 112 and 113. Objects to be displayed on different images are holo-graphically recorded in the respective sub-areas, using reference light having the same angle of incidence, thereby recording the first-stage hologram 11. Object images O1′, O2′ and O3′ recorded in the respective sub-areas 111, 112 and 113 are simultaneously reconstructed from the recorded first-stage hologram 11, so that a second-stage hologram recording material 21 is located near the reconstructed object images O1′, O2′ and O3′ for recording them as a reflection or transmission type volume hologram.
A method for fabricating a multi-image type hologram wherein one image changes over to another depending on a viewing direction, characterized in that a hologram recording material is divided into a plurality of sub-areas so that objects to be displayed on different images are holographically recorded in the respective sub-areas, using reference light having an identical angle of incidence, thereby making a first-stage hologram, and images of said objects recorded in the sub-areas are simultaneously reconstructed from the recorded first-stage hologram, so that a material for recording the second-stage hologram is located near the reconstructed object images to make a reflection or transmission type volume hologram.
A method for fabricating a full-color multi-image type hologram wherein one image changes over to another depending a viewing direction, characterized in that a plurality of hologram recording materials for different colors are each divided into a plurality of subareas in such a way as to correspond to one another so that objects to be displayed on different images are holographically recorded in the respective sub-areas at different color wavelengths for each recording material for hologram using reference light having an identical angle of incidence, thereby making a plurality of first-stage holograms, and images of the objects recorded in the respective sub-areas and having corresponding color components are simultaneously reconstructed from each of the recorded first-stage holograms, so that a material for recording the second-stage hologram is located near the reconstructed object images to make a reflection or transmission type volume hologram.
A method for fabricating a multi-image type hologram wherein one image changes over to another depending on a viewing direction, characterized in that objects to be displayed on different images are holo-graphically recorded in a plurality of the recording materials for the elemental hologram using reference light having an identical angle of incidence so that said plurality of elemental holograms are imposed side by side into a first-stage hologram, and images of the objects recorded in the respective elemental holograms are simultaneously reconstructed from said first-stage hologram so that a second-stage hologram recording material is located near the thus reconstructed object images to make a reflection or transmission type volume hologram.
A method for fabricating a full-color multi-image hologram wherein one image changes over to another depending on a viewing direction, characterized in that a plurality of materials for recording elemental hologram are provided for different colors;
A multi-image type hologram, characterized by comprising a volume hologram, wherein said volume hologram is recorded such that when irradiated with predetermined reconstructing light, there are a plurality of object images reconstructed near a surface of the hologram and there is a window reconstructed at a position spaced a predetermined distance from the surface of the hologram, and diffracted light for reconstructing each of said plurality of object images enters a different area of said window.
Dependencies are inferred from the claim text.