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AssigneeDenso Corporation
InventorsFuminori Nakashima, Naoyuki Kawazoe, Shoichiro Emmei, Yasuhiro Mizutani, Hidekazu Hattori, Satoru Kadowaki, Kazutaka Suzuki
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There is provided a hologram with excellent heat resistance. The hologram comprises a hologram film (10) in which a diffraction grating has been recorded, a substrate (11) situated on one side of the hologram film (10) via a bonding material (13), and a polymer film (12) situated on the other side of the hologram film (10) via a bonding material (13), wherein the thickness of the polymer film (12) is no greater than 100 .mu.m. Otherwise, the polymer film (12) is subjected to prior heat treatment. There is further provided a production process for holograms with minimal appearance defects. The process comprises preparing a photopolymer (210) coated onto a substrate (211) and affixing the photopolymer surface (301) onto a photographed object original (213), exposing it to laser light to converting it into a hologram (201), then releasing the hologram (201) from the photographed object original (213) to expose the hologram surface (302) and finally affixing a protective film (215) onto the hologram surface (302), such that the bonding strength A between the substrate (211) and the hologram (201) is greater than the bonding strength B between the hologram (201) and the protective film (215).
A hologram production process which is a continuous production process for holograms whereby there is prepared a photopolymer coated onto a substrate and the photopolymer surface of said photopolymer is affixed onto a photographed object original, after which it is exposed to laser light to copy the photographed object original onto said photopolymer to convert it into a hologram,
A hologram production process which is a continuous production process for holograms whereby there is prepared a photopolymer coated onto a substrate and the photopolymer surface of said photopolymer is affixed onto a photographed object original, after which it is exposed to laser light to copy the photographed object original onto said photopolymer to convert it into a hologram,
A hologram production process which is a continuous production process for holograms whereby there is prepared a photopolymer coated onto a substrate and the photopolymer surface of said photopolymer is affixed onto a photographed object original, after which it is exposed to laser light to copy the photographed object original onto said photopolymer to convert it into a hologram,
Dependencies are inferred from the claim text.