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AssigneeTDK Corporation
InventorsTetsuro Mizushima, Jiro Yoshinari, Isamu Kuribayashi, Masaki Aoshima, Koji Mishima
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A high-speed, write-once type optical recording medium, which utilizes laser light that is either blue or an even shorter wavelength, as well as an optical recording method and an optical recording apparatus for recording onto this optical recording medium. A high-speed, write-once type optical recording medium 10 having a recording layer 18 and a light transmission layer 22 formed sequentially on top of a support substrate 12, wherein the recording layer 18 is formed by laminating first and second vice-recording layers 18A, 18B which include Al and Sb respectively as primary components, and irradiation of a laser light of blue wavelength from a laser light source 24, through the light transmission layer 22 and onto the recording layer 18, causes diffusion and mixing of the Al and Sb contained within the first and second vice-recording layers 18A, 18B, and this mixing enables the formation of a recording mark based on an irreversible change in reflectance. The thickness of the recording layer 18 is set to enable recording at a recording transfer rate of at least 35 Mbps.
A high-speed, write-once type optical recording medium comprising at least a recording layer and a light transmission layer formed sequentially on top of a support substrate, wherein that said recording layer is formed by laminating at least two vice-recording layers, each of which comprises one type of metal as a primary component, and irradiation of a laser light that is either blue or an even shorter wavelength, from a side of said light transmission layer, causes diffusion and mixing of primary component metals contained within each of said vice-recording layers, this mixing enables formation of a recording mark based on an irreversible change in reflectance, and recording can be conducted at a recording transfer rate of at least 35 Mbps by using a system in which a thickness of said recording layer is from 3 to 50 nm, a wavelength of said laser light is from 200 to 450 nm, and which utilizes a lens system having an objective lens used for irradiation of said laser light, a numerical aperture of the objective lens being at least 0.8.
An optical recording method in which a recording layer of an optical recording medium formed by providing at least said recording layer and a light transmission layer sequentially on top of a support substrate is irradiated with laser light from a side of said light transmission layer to form a recording mark, wherein said laser light is either blue or an even shorter wavelength, said recording layer is formed by laminating at least two vice-recording layers, each of which comprises one type of metal as a primary component, irradiation of said laser light causes diffusion and mixing of primary component metals contained within each of said vice-recording layers, this mixing forms a recording mark based on an irreversible change in reflectance, and recording is conducted at a recording transfer rate of at least 35 Mbps.
A high-speed, write-once type optical recording apparatus comprising a laser light source for emitting a laser light that is either blue or an even shorter wavelength, a recording optical system for guiding laser light from said laser light source onto a recording layer of an optical recording medium formed by providing at least said recording layer and a light transmission layer sequentially on top of a support substrate, and for converging light from a side of said light transmission layer onto said recording layer, and an optical recording medium drive device for supporting said optical recording medium and moving said optical recording medium relative to a position of convergence of said laser light, wherein that said recording layer is formed by laminating at least two vice-recording layers, each of which comprises one type of metal as a primary component, and irradiation of said laser light causes diffusion and mixing of primary component metals contained within each of said vice-recording layers, this mixing enables formation of a recording mark based on an irreversible change in reflectance, and an irradiation energy of said laser light, a relative speed of movement of said optical recording medium and a thickness of said recording layer enable recording by said laser light to be conducted at a recording transfer rate of at least 35 Mbps.
Dependencies are inferred from the claim text.