Optical recording medium
AssigneePioneer Corporation
InventorsTetsuya Iida, Takamasa Yoshikawa, Katsuhiro Koike
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Abstract
Provided is an optical recording medium whose surface is not easily injured, particularly an optical recording medium which is not required to be put into a cartridge. The optical recording medium comprises a recording layer, a covering layer comprising a polymer material, and a protective layer which are successively deposited, recording or reproducing wavelength for the medium being 420 nm or less, the numerical aperture of an optical system for the medium being 0.74 or more, and light being radiated to the side of the protective layer to read out data in the recording layer. In the medium, the protective layer has a hardness of 1000 kg/mm2 or more and a thickness of 4.66 μm or less.
Claims14
An optical recording medium comprising a recording layer, a covering layer comprising a polymer material, and a protective layer which are successively deposited, recording or reproducing wavelength for the medium being 420 nm or less, the numerical aperture of an optical system for the medium being 0.74 or more, and light being radiated to the side of the protective layer to read out data in the recording layer,
- wherein the protective layer has a hardness of 1000 kg/mm2 or more and a thickness of 4.66 μm or less.
An optical recording medium comprising a recording layer, a covering layer comprising a polymer material, and a protective layer which are successively deposited, recording or reproducing wavelength for the medium being 420 nm or less, the numerical aperture of an optical system for the medium being 0.74 or more, and light being radiated to the side of the protective layer to read out data in the recording layer,
- wherein the protective layer has a hardness of 1000 kg/mm2 or more and a thickness of 4.66 μm or less,
- wherein the protective layer comprises diamond-like carbon.
A method for producing an optical recording medium comprising a recording layer, a covering layer comprising a polymer material, and a protective layer comprising diamond-like carbon which are successively deposited, data in the recording layer being read out from the side of the protective layer, comprising:
- the process of forming the covering layer on a surface of the recording layer, and
- the process of forming the protective layer on the surface of the formed covering layer by or deposition.
Dependencies are inferred from the claim text.