EP0286406A2
Expired / Lapsed
EP
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Optical recording medium
Assignee: Hitachi Ltd
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Filing: 1988-04-07
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Granted: —
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Expires: 2008-04-07
Abstract
Abstract An optical recording medium comprises a recording layer (1) capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy. The crystalline state of the recording layer is composed of a single phase of substantially a three-component compound or a higher multi-component compound. This medium can provide high speed recording and high speed erasing.
Inventors
- 👤 Yoshihito Maeda
- 👤 Toshiki Kaneko
- 👤 Masaichi Nagai
- 👤 Hisashi Andoh
- 👤 Yoshimi Katou
- 👤 Isao Ikuta
- 👤 Ryuji Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:53
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
53 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
Claim 2
Dependent Claim
53 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
Claim 3
Dependent Claim
55 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially either a three component compound or a four component compound.
Claim 4
Dependent Claim
55 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially either a three component compound or a four component compound.
Claim 5
Dependent Claim
52 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of either a three-component compound or a four-component compound.
Claim 6
Dependent Claim
52 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of either a three-component compound or a four-component compound.
Claim 7
Dependent Claim
55 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of containing 90% by atom or more of a three component compound.
Claim 8
Dependent Claim
55 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of containing 90% by atom or more of a three component compound.
Claim 9
Dependent Claim
61 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of In₃SbTe₂ and not more than 5% by weight of at least one of Ag, Sn and Cu.
Claim 10
Dependent Claim
61 words
An optical recording medium, which comprises a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of In₃SbTe₂ and not more than 5% by weight of at least one of Ag, Sn and Cu.
Claim 11
Dependent Claim
86 words
An optical recording medium, which comprises a substrate and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, and a surface protective layer composed of at least one of a inorganic oxide, an inorganic nitride and an inorganic fluoride and provided on the recording layer.
Claim 12
Dependent Claim
86 words
An optical recording medium, which comprises a substrate and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, and a surface protective layer composed of at least one of a inorganic oxide, an inorganic nitride and an inorganic fluoride and provided on the recording layer.
Claim 13
Dependent Claim
17 words
An optical recording medium according to Claim 6, wherein the surface protective layer is a glass plate.
Claim 14
Dependent Claim
74 words
An optical recording medium, which comprises an organic resin substrate and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, and a heat shielding layer provided between the recording layer and the substrate.
Claim 15
Dependent Claim
74 words
An optical recording medium, which comprises an organic resin substrate and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, and a heat shielding layer provided between the recording layer and the substrate.
Claim 16
Dependent Claim
89 words
An optical recording medium, which comprises a pair of glass substrates and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on each of the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, the recording layers on the pair of the glass substrate being made in contact to face each other through a heat shielding layer provided therebetween.
Claim 17
Dependent Claim
89 words
An optical recording medium, which comprises a pair of glass substrates and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on each of the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, the recording layers on the pair of the glass substrate being made in contact to face each other through a heat shielding layer provided therebetween.
Claim 18
Dependent Claim
81 words
An optical recording medium, which comprises a substrate and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, and a tightly enclosed recess filled with air being provided on the surface of the substrate in contact with the recording layer.
Claim 19
Dependent Claim
81 words
An optical recording medium, which comprises a substrate and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a four-component compound, and a tightly enclosed recess filled with air being provided on the surface of the substrate in contact with the recording layer.
Claim 20
Independent Claim
110 words
A method for optical recording and reproduction, which comprises: a step of providing a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound; a step of locally applying an electromagnetic energy to a desired part of the recording layer, thereby making the locally applied part undergo a phase change and recording information thereby; and a step of detecting the state at the phase-changed part, thereby reproducing the information recorded on the phase-changed part.
Claim 21
Independent Claim
110 words
A method for optical recording and reproduction, which comprises: a step of providing a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound; a step of locally applying an electromagnetic energy to a desired part of the recording layer, thereby making the locally applied part undergo a phase change and recording information thereby; and a step of detecting the state at the phase-changed part, thereby reproducing the information recorded on the phase-changed part.
Claim 22
Independent Claim
116 words
A method for optical recording and reproduction which comprises: a step of providing a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound; a step of locally applying an electromagnetic energy to a desired part of the recording layer, thereby making the locally applied part phases change from a crystalline state into an amorphous state and recording information thereby; and a step of detecting the state at the phase-changed part, thereby reproducing the information recorded on the phase-changed part.
Claim 23
Independent Claim
116 words
A method for optical recording and reproduction which comprises: a step of providing a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound; a step of locally applying an electromagnetic energy to a desired part of the recording layer, thereby making the locally applied part phases change from a crystalline state into an amorphous state and recording information thereby; and a step of detecting the state at the phase-changed part, thereby reproducing the information recorded on the phase-changed part.
Claim 24
Dependent Claim
27 words
A method according to Claim 12, wherein the detection is carried out for the state at the phase changed part as a difference in the optical property.
Claim 25
Dependent Claim
24 words
A method according to Claim 13, wherein any one of reflectivity, transmissivity, absorbance, emissivity and magnetic Kerr effect is detected as the optical property.
Claim 26
Independent Claim
147 words
A method for optical recording, reproduction and erasing, which comprises: a step of providing a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound; a step of locally applying an electromagnetic energy to a desired part of the recording layer, thereby making the locally applied part undergo a phase change and recording information thereby; a step of detecting the state at the phase-changed part, thereby reproducing the information recorded on the phase-changed part; and a step of applying at least an electromagnetic energy to at least a portion of the phase-changed part, thereby making the energy-applied portion undergo a phase change to the original state, thereby erasing the recorded information.
Claim 27
Independent Claim
147 words
A method for optical recording, reproduction and erasing, which comprises: a step of providing a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound; a step of locally applying an electromagnetic energy to a desired part of the recording layer, thereby making the locally applied part undergo a phase change and recording information thereby; a step of detecting the state at the phase-changed part, thereby reproducing the information recorded on the phase-changed part; and a step of applying at least an electromagnetic energy to at least a portion of the phase-changed part, thereby making the energy-applied portion undergo a phase change to the original state, thereby erasing the recorded information.
Claim 28
Dependent Claim
69 words
An optical card, which comprises a substrate having tracking grooves on the surface, a recording layer capable of reversibly udnergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the tracking grooves-provided surface of the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
Claim 29
Dependent Claim
69 words
An optical card, which comprises a substrate having tracking grooves on the surface, a recording layer capable of reversibly udnergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the tracking grooves-provided surface of the substrate, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
Claim 30
Dependent Claim
89 words
An optical card which comprises a substrate having tracking grooves on the surface, a heat shielding layer provided on the tracking groove-provided surface of the substrate, a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the heat shielding layer, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound, and a surface protective layer provided on the recording layer.
Claim 31
Dependent Claim
89 words
An optical card which comprises a substrate having tracking grooves on the surface, a heat shielding layer provided on the tracking groove-provided surface of the substrate, a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the heat shielding layer, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound, and a surface protective layer provided on the recording layer.
Claim 32
Dependent Claim
70 words
An audiodigital tape which comprises a flexible tape having tracking grooves on the surface and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of electromagnetic energy, provided on the tracking grooves-provided surface of the tape, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
Claim 33
Dependent Claim
70 words
An audiodigital tape which comprises a flexible tape having tracking grooves on the surface and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of electromagnetic energy, provided on the tracking grooves-provided surface of the tape, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
Claim 34
Dependent Claim
67 words
An optical head which comprises a disk having tracking grooves, and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the tracking grooves-provided surface of the disk, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
Claim 35
Dependent Claim
67 words
An optical head which comprises a disk having tracking grooves, and a recording layer capable of reversibly undergoing a phase change between a crystalline state and an amorphous state by irradiation of an electromagnetic energy, provided on the tracking grooves-provided surface of the disk, the crystalline state of the recording layer being composed of a single phase of substantially a three-component compound or a higher multi-component compound.
References Cited (Backward Citations)
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