Optical recording medium having intermediate layer of prescribed thickness and thickness range for use with 405nm laser
AssigneeKabushiki Kaisha Toshiba
InventorsKoji Takazawa, Seiji Morita, Kazuyo Umezawa, Naoki Morishita, Yasuaki Ootera, Hideo Ando, Naomasa Nakamura
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Abstract
According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, in this optical recording medium, an intermediate layer whose thickness variation is managed to be equal to or less than a predetermined value is provided between a first recording part and a second recording part.
Claims3
A multi-layer optical disc comprising:
- first and second layers;
- a burst cutting area on which particular information is recorded;
- and
- a system lead-in area, wherein the second layer is disposed at a greater distance from a light incident side than the first layer,
- the first layer is capable of recording or reproducing by light with a wavelength of 405 nm,
- the second layer is capable of recording or reproducing by light with a wavelength of 405 nm or 650 nm or more, and
- the particular information includes version information,
- the system lead-in area includes information corresponding to the version information, and
- the optical disc is configured to store
- first power-related information relating to a first peak power level and a first level subsequent to the first peak power level for the first layer, and
- second power-related information relating to a second peak power level and a second level subsequent to the second peak power level for the second layer.
A method of recording information on a multi-layer optical disc comprising first and second layers, a burst cutting area on which particular information is recorded, and system lead-in area, wherein the second layer is disposed at a greater distance from a light incident side than the first layer, the first layer is capable of recording or reproducing by light with a wavelength of 405 nm, the second layer is capable of recording or reproducing by light with a wavelength of 405 nm or 650 nm or more, and the particular information includes version information, the system lead-in area includes information corresponding to the version information, and the optical disc is configured to store first power-related information relating to a first peak power level and a first level subsequent to the first peak power level for the first layer and second power-related information relating to a second peak power level and a second level subsequent to the second peak power level for the second layer,
- the method comprising:
- recording data on the first layer or the second layer.
A method of reproducing information from a multi-layer optical disc comprising first and second layers, a burst cutting area on which particular information is recorded, and a system lead-in area, wherein the second layer is disposed at a greater distance from a light incident side than the first layer, the first layer is capable of recording or reproducing by light with a wavelength of 405 nm, the second layer is capable of recording or reproducing by light with a wavelength of 405 nm or 650 nm or more, and the particular information includes version information, the system lead-in area includes information corresponding to the version information, and the optical disc is configured to store first power-related information relating to a first peak power level and a first level subsequent to the first peak power level for the first layer and second power-related information relating to a second peak power level and a second level subsequent to the second peak power level for the second layer,
- the method comprising:
- reproducing data from the first layer or the second layer.
Dependencies are inferred from the claim text.