Optical information-recording media and optical information-recording/reproduction apparatus
AssigneeNEC Corporation
InventorShuichi Ohkubo
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Abstract
Optical information-recording media comprise a first transparent substrate through which a laser beam enters, a first information-recording layer deposited on the first transparent substrate, a first reflection film formed on the first information-recording layer, an intermediate layer deposited on the first reflection film, a second information-recording layer formed on the intermediate layer, a second reflection film deposited on the second information-recording layer, and a second substrate provided on the second reflection film. The recording film of each of the first and second information-recording layers has a main composition represented by (GeTe)xSb2−yInyTe3, and its composition ratio is within ranges of 0.04≦y<2 and 4≦x≦8.
Claims10
An optical information-recording medium, for which recording is performed by irradiating a recording film with a laser beam to change the reflectivity or the optical phase of the recording film, comprising:
- a first transparent substrate through which the laser beam enters;
- a first information-recording layer deposited on the first transparent substrate;
- a first reflection film formed on the first information-recording layer;
- an intermediate layer deposited on the first reflection film;
- a second information-recording layer formed on the intermediate layer;
- a second reflection film deposited on the second information-recording layer;
- and
- a second substrate provided on the second reflection film,
- wherein each of the first and the second information-recording layers is formed such that recording films are sandwiched between first and second dielectric layers, and
- wherein the recording film of each of the first and second information-recording layers has a main composition represented by (GeTe)xSb2−yInyTe3, and its composition ratio is within ranges of 0.04≦y<2 and 4≦x≦8.
An optical information-recording medium, for which recording is performed by irradiating a recording film with a laser beam to change the reflectivity or the optical phase of the recording film, comprising:
- a transparent substrate through which the laser beam enters;
- an information-recording layer, being formed on the transparent substrate and including a first dielectric film deposited on the transparent substrate, a recording film deposited on the first dielectric film, and a second dielectric film deposited on the recording film;
- and
- a reflection film formed on the second dielectric film,
- wherein the recording film has a main composition represented by (GeTe)xSb2−yInyTe3, and its composition ratio is within ranges of 0.04≦y<2 and 4≦x≦8.
An optical information-recording/reproduction apparatus comprising:
- an optical information-recording medium;
- an optical head for irradiating the optical information-recording medium with a laser beam;
- and
- a drive mechanism for driving the optical head to irradiate, with the laser beam, a desired position on the optical information-recording medium,
- wherein the optical information-recording medium comprises:
- a first transparent substrate through which the laser beam enters,
- a first information-recording layer deposited on the first transparent substrate,
- a first reflection film formed on the first information-recording layer,
- an intermediate layer deposited on the first reflection film,
- a second information-recording layer formed on the intermediate layer,
- a second reflection film deposited on the second information-recording layer, and
- a second substrate provided on the second reflection film,
- wherein each of the first and the second information-recording layers is formed such that recording films are sandwiched between first and second dielectric layers, and
- wherein the recording film of each of the first and second information-recording layers has a main composition represented by (GeTe)xSb2−yInyTe3, and its composition ratio is within ranges of 0.04≦y<2 and 4≦x≦8.
An optical information-recording/reproduction apparatus comprising:
- an optical information-recording medium;
- an optical head for irradiating the optical information-recording medium with a laser beam;
- and
- a drive mechanism for driving the optical head to irradiate, with the laser beam, a desired position on the optical information-recording medium,
- wherein the optical information-recording medium comprises:
- a transparent substrate through which the laser beam enters,
- an information-recording layer, being formed on the transparent substrate and including a first dielectric film deposited on the transparent substrate, a recording film deposited on the first dielectric film, and a second dielectric film deposited on the recording film, and
- a reflection film formed on the second dielectric film,
- wherein the recording film has a main composition represented by (GeTe)xSb2−yInyTe3, and its composition ratio is within ranges of 0.04≦y<2 and 4≦x≦8.
Dependencies are inferred from the claim text.