Optical information recording medium, method of manufacturing the same, and recording method on the same
AssigneeNEC Corporation
InventorShuichi Okubo
Life of this patent
Estimating the term…
Abstract
An optical information recording medium includes a substrate, and a record layer formed on the substrate. Information is recorded using a laser beam with a wavelength of 380 nm to 430 nm, and refraction index n and attenuation coefficient k of the record layer satisfy a relation of 3.9<n<5.6 and k>0.4 to the wavelength of 380 to 430 nm.
Claims26
An optical information recording medium comprising:
- a substrate;
- and
- a record layer formed on said substrate,
- wherein information is recorded using a laser beam with a wavelength of 380 nm to 430 nm, and
- refraction index n and attenuation coefficient k of said record layer satisfy a relation of 3.9<n<5.6 and k>0.4 to the wavelength of 380 to 430 nm.
An optical information recording medium comprising:
- a substrate;
- and
- a record layer formed on said substrate, and
- wherein information is recorded using a laser beam with a wavelength of 380 nm to 430 nm, and
- absorptivity of said record layer is equal to or more than 20% to said laser beam of said wavelength of 380 to 430 nm.
A method of recording information on an optical information recording medium, comprising the steps of:
- providing an optical information recording medium comprising:
- a substrate;
- and
- a record layer formed on said substrate, wherein said record layer has refraction index n and attenuation coefficient k of said record layer satisfying a relation of 3.9<n<5.6 and k>0.4 to a laser beam of a wavelength of 380 to 430 nm, or has absorptivity equal to or more than 20% to said laser beam of said wavelength of 380 to 430 nm;
- and
- recording information using a laser beam of a multi-pulse which satisfies a relation of 0<Pbw<0.5 mW and a relation of 0<Pb/Pw<0.33,
- where Pw is a peak power of said multi-pulse, Pbw is a bottom power of said multi-pulse, and Pb is a bias power between said record pulses.
A method of recording information on an optical information recording medium, comprising the steps of:
- providing an optical information recording medium comprising:
- a substrate;
- and
- a record layer formed on said substrate, wherein a record pulse of a laser beam with a wavelength of 380 to 430 nm is rectangular, said record layer has refraction index n and attenuation coefficient k of said record layer satisfying a relation of 3.9<n<5.6 and k>0.4 to a laser beam of a wavelength of 380 to 430 nm, or has absorptivity equal to or more than 20% to said laser beam of said wavelength of 380 to 430 nm, and
- recording information with said record pulse of said laser beam with said wavelength of 380 to 430 nm while said optical information recording medium is rotated in a line velocity equal to or more than 10 m/s.
A method of manufacturing an optical information recording medium, on which optical information is recorded using a laser beam with a wavelength of 380 nm to 430 nm, comprising the steps of:
- adjusting a gas pressure such that a thermal conductivity of a record layer has a desired value;
- and
- forming said record layer on a substrate in the adjusted gas pressure by a sputtering method using a target of Si or Ge.
An optical information recording medium comprising:
- a substrate;
- a record layer formed on said substrate;
- a light transmissive layer formed on said record layer;
- and
- a thermal transformation restraint layer provided between said record layer and said light transmissive layer, and
- information is recorded using a laser beam having a wavelength of 380 nm to 430 nm and irradiated to said record layer through said light transmissive layer.
A method of recording optical information on an optical information recording medium, comprising the steps of:
- providing an optical information recording medium comprising:
- a substrate having guide trenches formed on said substrate in a predetermined pitch,
- a record layer formed on said substrate,
- a light transmissive layer formed on said record layer, and
- a thermal transformation restraint layer provided between said record layer and said light transmissive layer,
- wherein information is recorded using a laser beam having a wavelength of 380 nm to 430 nm and irradiated to said record layer through said light transmissive layer;
- and
- recording information on inside of each of guide trenches formed on said substrate and a flat section between said guide trenches.
An optical information recording medium comprising:
- a substrate having guide trenches formed on said substrate in a predetermined pitch;
- and
- a record layer formed on said substrate,
- wherein information is recorded a flat section between said guide trenches using a laser beam having a wavelength of 380 nm to 430 nm.
An optical information recording medium comprising:
- a substrate having guide trenches formed on said substrate in a predetermined pitch;
- and
- a record layer formed on said substrate,
- wherein when information is recorded using a laser beam having a wavelength of 380 nm to 430 nm, a depth of said guide trench corresponding to a portion where said information is recorded is shallower after said record than the depth of said guide trench before said record.
An optical information recording medium comprising:
- a substrate;
- and
- a record layer formed on said substrate,
- wherein information is recorded by irradiating a laser beam with a wavelength of 380 nm to 430 nm to said record layer such that a gap is partially formed between said record layer and said substrate in a position where said laser beam is irradiated.
Dependencies are inferred from the claim text.