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US 7,125,594 B2Granted
Write-once optical recording medium
AssigneeKabushiki Kaisha Toshiba
InventorsSeiji Morita, Masatoshi Sakurai, Katsuyuki Naito
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Abstract
A write-once optical recording medium has a transparent resin substrate having a concentric groove or a spiral groove and having recessed cells defining recording regions that are arranged in the groove, a recording film comprising an organic dye formed to fill the cells, and a metal reflection film formed on the recording film.
Claims10
A write-once optical recording medium, comprising:
- a transparent resin substrate having a concentric groove or a spiral groove and having recessed cells defining recording regions that are arranged in the groove;
- a recording film comprising an organic dye formed to fill the cells;
- and
- a metal reflection film formed on the recording film,
- wherein a deformation amount D of the substrate within a cell caused upon recording satisfies the following formula:
- DA=λ/[k×Ndy]
- where λ is a wavelength of a laser beam used for recording, Ndy is a refractive index of the organic dye, and k is a number in a range between 4.8 and 5.7.
4 more elements
An optical recording medium, comprising:
- a substrate made of transparent resin, having a groove and recessed cells in the groove;
- a recording film comprising an organic dye formed to fill the cells on the substrate;
- and
- a metal film formed on the recording film,
- wherein a deformation amount D of the substrate within a cell caused upon recording satisfies the following formula:
- D=λ/[k×Ndy]
- where λ is a wavelength of a laser beam used for recording, Ndy is a refractive index of the organic dye, and k is a number in a range between 4.8 and 5.7.
4 more elements
Dependencies are inferred from the claim text.