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US 2009/0022931 A1Published application
Information recording medium
AssigneeKabushiki Kaisha Toshiba
InventorsSeiji MORITA, Koji TAKAZAWA, Kazuyo UMEZAWA, Naoki MORISHITA, Naomasa NAKAMURA
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Abstract
According to one embodiment, an information recording medium including a recording film using an organic recording material recorded by recording light having a wavelength of 405 nm and an organic recording material whose light reflection quantity varies by reproducing light having a wavelength of 650 nm for a recording layer and an optical reflection layer and a land sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove is provided on an interface between the recording layer and the optical reflection layer.
Claims7
An information recording medium comprising:
- a recording film comprising a recording layer and an optical reflection layer;
- and
- a land which is sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove and formed on a substrate,
- wherein
- the recording film has a light reflectivity that enables reproduction with a light with a wavelength of 650±5 nm,
- the recording layer has a recording sensitivity with respect to a light having a wavelength shorter than 650±5 nm,
- a recording mark of the recording layer is configured to be formed on the pre-groove with the light having a wavelength shorter than 650±5 nm, and
- the light reflectivity is not smaller than 45%, and a push-pull signal value after recording is not greater than 0.17.
5 more elements
An information recording medium comprising:
- a recording film comprising a recording layer and an optical reflection layer;
- and
- a land which is sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove and formed on a substrate,
- wherein
- the recording film has a light reflectivity that enables reproduction with a light with a wavelength of 650±5 nm,
- the recording layer has a recording sensitivity with respect to a light having a wavelength equal to or shorter than 650±5 nm,
- the recording layer is configured to have a recording mark formed on the pre-groove with a light having a shorter wavelength than 650±5 nm, and
- the light reflectivity is not smaller than 45%, a degree of signal modulation is not smaller than 0.45, and a push-pull signal value after recording is not greater than 0.17.
5 more elements
An information recording medium comprising:
- a recording film comprising a recording layer and an optical reflection layer;
- and
- a land which is sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove and formed on a substrate,
- wherein
- the recording film has a light reflectivity that enables reproduction with a light with a wavelength of 650±5 nm,
- the recording layer has a recording sensitivity with respect to a light having a wavelength equal to or shorter than 650±5 nm,
- a recording mark of the recording layer is configured to be formed with the light having a wavelength equal to or smaller than 650±5 nm, and
- a groove is configured to have a width within a range from 170 nm to 470 nm and a depth within a range from 20 nm to 36 nm.
5 more elements
An information recording medium comprising:
- a recording film comprising a recording layer and an optical reflection layer;
- and
- a land which is sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove and formed on a substrate,
- wherein
- the recording film has a light reflectivity that enables reproduction with a light with a wavelength of 650±5 nm,
- the recording layer has a recording reflectivity with respect to a light having a wavelength equal to or shorter than 650±5 nm,
- a recording mark of the recording layer is configured to be formed with the light having a wavelength equal to or shorter than 650±5 nm, and
- a signal polarity is low-to-high when recording and reproduction are executed with a light having a short wavelength, and a signal polarity is low-to-high when reproduction is performed with the light with a wavelength of 650±5 nm.
5 more elements
An information recording medium comprising:
- a recording film comprising a recording layer and an optical reflection layer;
- and
- a land which is sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove and formed on a substrate,
- wherein
- the recording film has a light reflectivity that enables reproduction with light with a wavelength of 650±5 nm,
- the recording layer has a recording sensitivity with respect to light having a wavelength equal to or shorter than 650±5 nm,
- a recording mark of the recording layer is configured to be formed with the light having a wavelength equal to or shorter than 650±5 nm, and
- a signal polarity is low-to-high when recording and reproduction are executed with light having a short wavelength, and a signal polarity is high-to-low when reproduction is performed with light with a wavelength of 650±5 nm.
5 more elements
An information recording medium comprising:
- a recording film comprising a recording layer and an optical reflection layer;
- and
- a land which is sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove and formed on a substrate,
- wherein
- the recording film has a light reflectivity that enables reproduction with light with a wavelength of 650±5 nm,
- the recording layer has a recording sensitivity with respect to light having a wavelength equal to or shorter than 650±5 nm,
- a recording mark of the recording layer is configured to be formed with light having a wavelength equal to or shorter than 650±5 nm, and at least two local maximal absorption wavelengths in an absorption spectrum fall within a range from 380 to 480 nm and a range from 680 to 750 nm.
4 more elements
An information recording medium comprising:
- a recording film comprising a recording layer and an optical reflection layer;
- and
- a land which is sandwiched between a pre-groove having an irregular shape and an adjoining pre-groove and formed on a substrate,
- wherein
- the recording film has a light reflectivity that enables reproduction with light with a wavelength of 650±5 nm,
- the recording layer has a recording sensitivity with respect to light having a wavelength equal to or shorter than 650±5 nm,
- a recording mark of the recording layer is configured to be formed with the light having a wavelength equal to or shorter than 650±5 nm, and
- at least two local maximal absorption wavelengths in an absorption spectrum fall within a range from 380 to 480 nm and a range from 550 to 610 nm.
5 more elements
Dependencies are inferred from the claim text.