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US 5,474,826 AGranted
Optical recording medium and optical recording/reproducing apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsYoshinori Honguh, Toyoki Taguchi, Hiroshi Hasegawa, Tadashi Kobayashi, Naoki Morishita, Naomasa Nakamura
Life of this patent
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Abstract
An optical recording medium comprises a transparent substrate, an inner protection layer, a recording material layer, an outer protection layer, and a reflection layer, which are laminated in this order. In an in-groove recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.52 and 0.95. In an on-land recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.32 and 0.6.
Claims19
An optical recording and reproducing apparatus, comprising:
- an optical recording medium having a plurality of guide grooves for tracking, at least some of said plurality of guide grooves having a plurality of recording marks which record information in an in-groove recording mode, said optical recording medium comprising a transparent substrate, an inner protection layer formed on the transparent substrate, a recording material layer formed on the inner projection layer, an outer protection layer formed on the recording material layer, and a reflection layer formed on the outer protection layer, wherein the ratio of the thickness of the recording material layer to the thickness of the outer protection layer in the in-groove recording mode is in a range between 0.52 and 0.95;
- a laser element for emitting a laser beam;
- an objective lens facing said optical recording medium, for converging the laser beam to the optical recording medium to record information thereon and reproduce recorded information therefrom;
- and
- a light detector for converting the laser beam reflected from said optical recording medium into an electric signal.
2 more elements
An optical recording and reproducing apparatus, comprising:
- an optical recording medium having a plurality of guide grooves for tracking, at least some of said plurality of guide grooves having a plurality of recording marks which record information in an in-grove recording mode, said optical recording medium comprising a transparent substrate, an inner protection layer formed on the transparent substrate, a recording material layer formed on the inner projection layer, an outer protection layer formed on the recording material layer, and a reflection layer formed on the outer protection layer, wherein the ratio of the thickness of the recording material layer to the thickness of the inner protection layer in the in-groove recording mode is in a range between 0.053 and 0.098;
- a laser element for emitting a laser beam;
- an objective lens facing said optical recording medium, for converging the laser beam to said optical recording medium to record information thereon and reproduce recorded information therefrom;
- and
- a light detector for converting the laser beam reflected from said optical recording medium into an electric signal.
2 more elements
An optical recording and reproducing apparatus, comprising:
- an optical recording medium having a plurality of guide grooves for tracking and a plurality of land portions each existing between adjacent two of said guide grooves, a plurality of recording marks being formed in at least some of said guide grooves to record information in an in-groove mode, and a plurality of recording marks being formed on at least some of said land portions to record information in an on-land recording mode, said optical recording medium comprising a transparent substrate, an inner protection layer formed on the transparent substrate, a recording material layer formed on the inner projection layer, an outer protection layer formed on the recording material layer, and a reflection layer formed on the outer protection layer, wherein the ratio of the thickness of the recording material layer to the thickness of the outer protection layer in the on-land recording mode and in-groove mode is in a range between 0.52 and 0.6;
- a laser element for emitting a laser beam;
- an objective lens facing said optical recording medium, for converging the laser beam to the optical recording medium to record information thereon and reproduce recorded information therefrom;
- and
- a light detector for converting the laser beam reflected from said optical recording medium into an electric signal.
2 more elements
An optical recording and reproducing apparatus, comprising:
- an optical recording medium having a plurality of guide grooves for tracking and a plurality of land portions each existing between adjacent two of said guide grooves, a plurality of recording marks being formed on at least some of said land portions to record information in an on-groove recording made, said optical recording medium comprising a transparent substrate, an inner protection layer formed on the transparent substrate, a recording material layer formed on the inner projection layer, an outer protection layer formed on the recording material layer, and a reflection layer formed on the outer protection layer, wherein the ratio of the thickness of the recording material layer to the thickness of the inner protection layer in the in-groove recording mode is in a range between 0.033 and 0.063;
- a laser element for emitting a laser beam;
- an objective lens facing said optical recording medium, for converging the laser beam to the optical recording medium to record information thereon and reproduce recorded information therefrom;
- and
- a light detector for converting the laser beam reflected from said optical recording medium into an electric signal.
2 more elements
An optical recording and reproducing apparatus, comprising:
- an optical recording medium having a plurality of guide grooves for tracking, at least some of said plurality of guide grooves having a plurality of recording marks which record information in an in-groove recording mode, said optical recording medium comprising a transparent substrate, an inner protection layer formed on the transparent substrate, a recording material layer formed on the inner projection layer, an outer protection layer formed on the recording material layer, and a reflection layer formed on the outer protection layer, wherein the ratio of the thickness of the recording material layer to the thickness of the outer protection layer in the in-groove recording mode is in a range between 0.6 and 0.8;
- a laser element for emitting a laser beam;
- an objective lens facing said optical recording medium, for converging the laser beam to the optical recording medium to record information thereon and reproduce recorded information therefrom;
- and
- a light detector for converting the laser beam reflected from slid optical recording medium into an electric signal.
2 more elements
Dependencies are inferred from the claim text.