EP0347801A2
Expired / Lapsed
EP
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Optical recording media and information recording and reproducing units
Assignee: Hitachi Ltd
•
Filing: 1989-06-19
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Granted: —
•
Expires: 2009-06-19
Abstract
Abstract The present invention provides an optical recording medium using an amorphous-crystalline phase-change for recording and erasing, wherein reflectivity of an optical recording medium-constituting recording film in an amorphous state is larger than that of the optical recording medium-constituting recording film in a crystalline state, or wherein absorptivity of an optical recording medium-constituting recording film in an amorphous state is smaller than that of the optical recording medium-constituting recording film in a crystalline state.
Inventors
- 👤 Yoshihito Maeda
- 👤 Isao Ikuta
- 👤 Hisashi Andoh
- 👤 Masaichi Nagai
- 👤 Yoshimi Katoh
- 👤 Yoshio Sato
- 👤 Nobuyoshi Tsuboi
- 👤 Hiroyuki Minemura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 07:25
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/242; G11B7/004; G11B7/0045; G11B7/0055; G11B7/00557; G11B7/243; G11B7/258; G11B2007/24302; G11B2007/24304; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/00454; G11B7/005; G11B7/0052; G11B7/253; G11B7/2531; G11B7/2585; G11B7/2595; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
40 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, wherein reflectivity of an optical recording medium-constituting recording film in an amorphous state is larger than that of the optical recording medium-constituting recording film in a crystalline state.
Claim 2
Dependent Claim
40 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, wherein reflectivity of an optical recording medium-constituting recording film in an amorphous state is larger than that of the optical recording medium-constituting recording film in a crystalline state.
Claim 3
Dependent Claim
48 words
An optical recording medium according to claim 1, wherein the optical recording medium-constituting recording film has a portion having a lower reflectivity formed by partial irradiation of the recording film in an as-deposited state with a laser, said portion being adjacent to a portion having a higher reflectivity.
Claim 4
Dependent Claim
62 words
An optical recording medium according to claim 1 which satisfies α = 7 to 8 in a relation of PA/100 = α wherein absorptivity in the as-deposited state is A (%), a laser power to irradiate is P (mW), and characteristic coefficient determinable on the basis of melting point, specific heat and thermal conductivity of the optical recording medium-constituting film is α.
Claim 5
Dependent Claim
54 words
An optical recording medium according to claim 1 in which the recording film is formed directly or indirectly on a supporting property-possessing light-transmissible substrate or plasticizable sheet or tape and which has a structure to exhibit an optical interference effect or protective effect by using at least one of dielectric and metal reflection films.
Claim 6
Dependent Claim
127 words
An optical recording medium according to claim 1 which has one of the following structures wherein the light-transmissible substrate, sheet or tape is abbreviated as S, S/recording film/dielectric film, S/recording film/metal reflection film, S/recording film/metal reflection film/dielectric film, S/recording film/dielectric film/metal reflection film, S/recording film/dielectric film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film, S/dielectric film/recording film/metal reflection film, S/dielectric film/recording film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film/metal reflection film, S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film, S/recording film/S, S/recording film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/dielectric film/S, S/dielectric film/recording film/S, S/dielectric film/recording film/dielectric film/S, S/dielectric film/recording film/metal reflection film/S, S/dielectric film/recording film/metal reflection film dielectric film/S, S/dielectric film/recording film/dielectric film/metal reflection film/S, and S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film/S.
Claim 7
Dependent Claim
43 words
An optical recording medium according to claim 1 wherein the optical recording medium-constituting film comprises a binary compound composed of at least one selected from the group consisting of antimony, zinc, tin, lead, copper, silver, gold, indium and germanium, and a chalcogen element.
Claim 8
Dependent Claim
63 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, which satisfies Ras-depo. > Ra > Rx wherein Ras-depo. represents reflectivity of a recording film, in an as-deposited state, which constitutes the above recording medium, Rx represents reflectivity of the recording medium-constituting recording film in crystalline state and Ra represents reflectivity of the recording medium constituting recording film in amorphous state.
Claim 9
Dependent Claim
63 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, which satisfies Ras-depo. > Ra > Rx wherein Ras-depo. represents reflectivity of a recording film, in an as-deposited state, which constitutes the above recording medium, Rx represents reflectivity of the recording medium-constituting recording film in crystalline state and Ra represents reflectivity of the recording medium constituting recording film in amorphous state.
Claim 10
Dependent Claim
48 words
An optical recording medium according to claim 7 wherein the optical recording medium-constituting recording film has a portion having a lower reflectivity formed by partial irradiation of the recording film in the as-deposited state with a laser, said portion being adjacent to a portion having a higher reflectivity.
Claim 11
Dependent Claim
63 words
An optical recording medium according to claim 7 which satisfies α = 7 to 8 in a relation of PA/100 = α wherein absorptivity in the as-deposited state is A (%), a laser power to irradiate is P (mW), and characteristic coefficient determinable on the basis of a melting point, specific heat and thermal conductivity of the optical recording medium-constituting film is α.
Claim 12
Dependent Claim
54 words
An optical recording medium according to claim 7 in which the recording film is formed directly or indirectly on a supporting property-possessing light-transmissible substrate or plasticizable sheet or tape and which has a structure to exhibit an optical interference effect or protective effect by using at least one of dielectric and metal reflection films.
Claim 13
Dependent Claim
127 words
An optical recording medium according to claim 7 which has one of the following structures wherein the light-transmissible substrate, sheet or tape is abbreviated as S, S/recording film/dielectric film, S/recording film/metal reflection film, S/recording film/metal reflection film/dielectric film, S/recording film/dielectric film/metal reflection film, S/recording film/dielectric film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film, S/dielectric film/recording film/metal reflection film, S/dielectric film/recording film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film/metal reflection film, S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film, S/recording film/S, S/recording film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/dielectric film/S, S/dielectric film/recording film/S, S/dielectric film/recording film/dielectric film/S, S/dielectric film/recording film/metal reflection film/S, S/dielectric film/recording film/metal reflection film/dielectric film S, S/dielectric film/recording film/dielectric film/metal reflection film/S, and S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film/S.
Claim 14
Dependent Claim
51 words
An optical recording medium according to claim 7 wherein the optical recording medium-constituting to claim 7 wherein the optical recording medium-constituting film comprises a binary compound composed of at least one selected from the group consisting of antimony, zinc, tin, lead, copper, silver, gold, indium and germanium, and a chalcogen element.
Claim 15
Dependent Claim
40 words
An optical recording medium using an amorphous-crystalline phase-change of recording and erasing, wherein absorptivity of an optical recording medium-constituting recording film in an amorphous state is smaller than that of the optical recording medium-constituting recording film in a crystalline state.
Claim 16
Dependent Claim
40 words
An optical recording medium using an amorphous-crystalline phase-change of recording and erasing, wherein absorptivity of an optical recording medium-constituting recording film in an amorphous state is smaller than that of the optical recording medium-constituting recording film in a crystalline state.
Claim 17
Dependent Claim
47 words
An optical recording medium according to claim 13 wherein the optical recording medium-constituting recording film has a portion having lower reflectivity formed by partial irradiation of the recording film in the as-deposited state with a laser, said portion being adjacent to a portion having a higher reflectivity.
Claim 18
Dependent Claim
63 words
An optical recording medium according to claim 13 which satisfies α = 7 to 8 in a relation of PA/100 = α wherein absorptivity in the as-deposited state is A (%), a laser power to irradiate is P (mW), and characteristic coefficient determinable on the basis of a melting point, specific heat and thermal conductivity of the optical recording medium-constituting film is α.
Claim 19
Dependent Claim
54 words
An optical recording medium according to claim 13 in which the recording film is formed directly or indirectly on a supporting property-possessing light-transmissible substrate or plasticizable sheet or tape and which has a structure to exhibit an optical interference effect or protective effect by using at least one of dielectric and metal reflection films.
Claim 20
Dependent Claim
127 words
An optical recording medium according to claim 13 which has one of the following structures wherein the light-transmissible substrate, sheet or tape is abbreviated as S, S/recording film/dielectric film, S/recording film/metal reflection film, S/recording film/metal reflection film/dielectric film, S/recording film/dielectric film/metal reflection film, S/recording film/dielectric film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film, S/dielectric film/recording film/metal reflection film, S/dielectric film/recording film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film/metal reflection film, S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film, S/recording film/S, S/recording film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/dielectric film/S, S/dielectric film/recording film/S, S/dielectric film/recording film/dielectric film/S, S/dielectric film/recording film/metal reflection film/S, S/dielectric film/recording film/metal reflection film/dielectric film S, S/dielectric film/recording film/dielectric film/metal reflection film/S, and S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film/S.
Claim 21
Dependent Claim
43 words
An optical recording medium according to claim 13 wherein the optical recording medium-constituting film comprises a binary compound composed of at least one selected from the group consisting of antimony, zinc, tin, lead, copper, silver, gold, indium and germanium, and a chalcogen element.
Claim 22
Dependent Claim
65 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, which satisfies Aas-depo. < Aa < Ax wherein Aas-depo. represents absorptivity of a recording film, in an as-deposited state, which constitutes the above recording medium, Ax represents absorptivity of the recording medium-constituting recording film in a crystalline state and Aa represents reflectivity of the recording medium constituting- recording film in an amorphous state.
Claim 23
Dependent Claim
65 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, which satisfies Aas-depo. < Aa < Ax wherein Aas-depo. represents absorptivity of a recording film, in an as-deposited state, which constitutes the above recording medium, Ax represents absorptivity of the recording medium-constituting recording film in a crystalline state and Aa represents reflectivity of the recording medium constituting- recording film in an amorphous state.
Claim 24
Dependent Claim
47 words
An optical recording medium according to claim 19 wherein the optical recording medium-constituting recording film has a portion having lower reflectivity formed by partial irradiation of the recording film in the as-deposited state with a laser, said portion being adjacent to a portion having a higher reflectivity.
Claim 25
Dependent Claim
63 words
An optical recording medium according to claim 19 which satisfies α = 7 to 8 in a relation of PA/100 = α wherein absorptivity in the as-deposited state is A (%), a laser power to irradiate is P (mW), and characteristic coefficient determinable on the basis of a melting point, specific heat and thermal conductivity of the optical recording medium-constituting film is α.
Claim 26
Dependent Claim
54 words
An optical recording medium according to claim 19 in which the recording film is formed directly or indirectly on a supporting property-possessing light-transmissible substrate or plasticizable sheet or tape and which has a structure to exhibit an optical interference effect or protective effect by using at least one of dielectric and metal reflection films.
Claim 27
Dependent Claim
128 words
An optical recording medium according to claim 19 which has one of the following structures wherein the light-transmissible substrate, sheet or tape is abbreviated as S, S/recording film/dielectric film, S/recording film/metal reflection film, S/recording film/metal reflection film/ dielectric film, S/recording film/dielectric film/metal reflection film, S/recording film/dielectric film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film, S/dielectric film/recording film/metal reflection film, S/dielectric film/recording film/metal reflection film/dielectric film, S/dielectric film/recording film/dielectric film/metal reflection film, S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film, S/recording film/S, S/recording film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/S, S/recording film/dielectric film/metal reflection film/dielectric film/S, S/dielectric film/recording film/S, S/dielectric film/recording film/dielectric film/S, S/dielectric film/recording film/metal reflection film/S, S/dielectric film/recording film/metal reflection film/dielectric film S, S/dielectric film/recording film/dielectric film/metal reflection film/S, and S/dielectric film/recording film/dielectric film/metal reflection film/dielectric film/S.
Claim 28
Dependent Claim
43 words
An optical recording medium according to claim 19 wherein the optical recording medium-constituting film comprises a binary compound composed of at least one selected from the group consisting of antimony, zinc, tin, lead, copper, silver, gold, indium and germanium, and a chalcogen element.
Claim 29
Dependent Claim
48 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, wherein a recording film constituting the recording medium has a larger refractive index in an amorphous state than in a crystalline state and a smaller extinction coefficient in the amorphous state than in the crystalline state.
Claim 30
Dependent Claim
48 words
An optical recording medium using an amorphous-crystalline phase-change for recording and erasing, wherein a recording film constituting the recording medium has a larger refractive index in an amorphous state than in a crystalline state and a smaller extinction coefficient in the amorphous state than in the crystalline state.
Claim 31
Dependent Claim
30 words
An optical recording medium according to claim 25 wherein the recording film constituting the recording medium comprises at least one simple substance of element and at least one chalcogenide compound.
Claim 32
Dependent Claim
44 words
An optical recording medium according to claim 25 wherein the recording film constituting the optical recording medium comprises at least one element selected from the group consisting of antimony, zinc, tin, lead, copper, silver, gold, indium and germanium, and at least one chalcogenide compound.
Claim 33
Dependent Claim
38 words
An optical recording medium according to claim 25 wherein the recording film constituting the optical recording medium comprises a compound formed from indium and tellurium, a compound formed from antimony and tellurium, and a simple substance of antimony.
Claim 34
Dependent Claim
46 words
An optical recording medium according to claim 25 wherein the recording film constituting the optical recording medium comprises 15 at % to 35 at % of indium, 25 at % to 50 at % of tellurium and 25 at % to 50 at % of antimony.
Claim 35
Dependent Claim
51 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same.
Claim 36
Dependent Claim
74 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same and the attainable temperature of a recorded part obtained by the laser irradiation is higher than the attainable temperature of an erased part.
Claim 37
Dependent Claim
77 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same and the attainable temperature of a existing recorded part to be erased by the laser irradiation is lower than the attainable temperature of an unrecorded part.
Claim 38
Dependent Claim
77 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same and the power of the laser in the irradiation for the recording is larger than the power of the laser in the irradiation for the erasing.
Claim 39
Dependent Claim
77 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same and the pulse width of the laser in irradiation for the recording is smaller than the pulse width of the laser in irradiation for the erasing.
Claim 40
Dependent Claim
96 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same and the powers of the laser for the recording and erasing are the same, the recording being carried out by irradiating a laser pulse having a pulse width equivalent to a recording frequency, the erasing being carried out by irradiating a direct current laser beam.
Claim 41
Dependent Claim
52 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein a portion of an optical recording medium-constituting recording film in the as-deposited state is irradiated with a laser to change the reflectivity, and an information signal is recorded on the portion of which the reflectivity is changed.
Claim 42
Dependent Claim
52 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein a portion of an optical recording medium-constituting recording film in the as-deposited state is irradiated with a laser to decrease the reflectivity, and an information signal is recorded on the portion of which the reflectivity is decreased.
Claim 43
Dependent Claim
36 words
A process using the optical recording medium of claim 1 for recording and erasing, wherein the recording and erasing are carried out by using a laser diode having a oscillation wavelenght of 600 to 860 nm.
Claim 44
Dependent Claim
51 words
A process using the optical recording medium of claim 7 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same.
Claim 45
Dependent Claim
51 words
A process using the optical recording medium of claim 13 for recording and erasing, wherein the recording and erasing is carried out by irradiating a recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same.
Claim 46
Dependent Claim
50 words
A process using the optical recording medium of claim 19 for recording and erasing, wherein the recording and erasing is carried out by irradiating recording film constituting the optical recording medium with a laser beam to elevate the temperature thereof to more than the melting point thereof and melt same.
Claim 47
Dependent Claim
70 words
An information recording and reproducing unit with an optical recording medium (19) according to one of the claims 1, 7, 13 or 19 comprising a laser beam source, a laser actuating circuit (21) to actuate the laser beam source, an optical system (13, 14) to focus a laser beam on an optical recording medium (19) and a detection circuit (15) to detect an optical change on the optical recording medium.
Claim 48
Dependent Claim
24 words
An information recording and reproducing unit according to claim 42 wherein the laser beam source has an oscillation wavelength of 600 to 860 nm.
References Cited (Backward Citations)
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