Hologram recording medium and hologram recording/reproduction device
OwnerTetsuro Mizushima, Kenichi Kasazumi +3inventors
InventorsTetsuro Mizushima, Kenichi Kasazumi, Tomoya Sugita, Kazuhisa Yamamoto, Shinichi Kadowaki
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Abstract
A hologram recording medium has a substrate and a hologram recording layer into or from which information is recorded or reproduced by a hologram, and a concavo-convex pattern having a reflection layer that transmits hologram recording/reproducing light and reflects light having a longer wavelength than the hologram recording/reproducing light is formed inside the hologram recording medium.
Claims19
A hologram recording medium having a substrate and a hologram recording layer into or from which information is recorded or reproduced by a hologram, characterized in that:
- a concavo-convex pattern is formed inside the hologram recording medium;
- and
- the concavo-convex pattern has a reflection layer that transmits hologram recording/reproducing light and reflects light having a longer wavelength than the hologram recording/reproducing light.
A hologram recording medium having a substrate and a hologram recording layer into or from which information is recorded or reproduced by a hologram, characterized in that:
- a concavo-convex pattern detected by light having a longer wavelength than hologram recording/reproducing light is formed on a surface and/or in an inside of the hologram recording medium;
- and
- a pitch of the concavo-convex pattern is smaller than a distance over which the hologram recording medium and/or an optical system is moved to an adjacent hologram information page on a medium surface of the hologram recording medium during recording or reproduction of the hologram.
A hologram recording medium having a substrate and a hologram recording layer into or from which information is recorded or reproduced by a hologram, characterized in that:
- the hologram recording layer has a hologram fixing portion in an inside thereof that transmits hologram recording/reproducing light and suppresses a change in shape of the hologram recording layer.
A hologram recording medium having a substrate and a hologram recording layer into or from which information is recorded or reproduced by a hologram, characterized in that:
- a concavo-convex pattern detected by light having a longer wavelength than hologram recording/reproducing light is formed inside the hologram recording medium;
- and
- position information and contents information are recorded in the concavo-convex pattern.
A hologram recording/reproduction device that records or reproduces information by a hologram into or from a hologram recording medium having a concavo-convex pattern in an inside thereof, characterized by comprising:
- a first light source that emits hologram recording/reproducing light;
- a second light source that emits position detecting light having a longer wavelength than the hologram recording/reproducing light;
- and
- a detection portion that reproduces position information and contents information recorded in the concavo-convex pattern by detecting reflected light of the position detecting light emitted from the second light source and collected on the concavo-convex pattern.
Dependencies are inferred from the claim text.