WO2005044577A1 - 相変化型光記録媒体 - Google Patents
相変化型光記録媒体 Download PDFInfo
- Publication number
- WO2005044577A1 WO2005044577A1 PCT/JP2004/016347 JP2004016347W WO2005044577A1 WO 2005044577 A1 WO2005044577 A1 WO 2005044577A1 JP 2004016347 W JP2004016347 W JP 2004016347W WO 2005044577 A1 WO2005044577 A1 WO 2005044577A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording
- layer
- phase
- recording medium
- optical recording
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/2431—Metals or metalloids group 13 elements (B, Al, Ga, In)
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00454—Recording involving phase-change effects
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/259—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on silver
Definitions
- the present invention relates to a rewritable phase-change optical recording medium that records and reproduces information by irradiating a laser beam to cause an optical change in a recording layer material, and is capable of rewriting. is there.
- phase-change recording material used for DVD + RW is an improvement over the AglnSbTe-based high-speed recording material used for CD-RW, which enables recording and erasing at high linear velocities.
- this material system in order to correspond to the recording speed in the high linear velocity recording area, a material having a higher Sb content than that of a CD-RW compliant recording material is used. Although the speed increases, there is a problem that the crystallization temperature decreases.
- the present inventors have focused on a GaSb material system as a next-generation high-speed recording material replacing the AglnSbTe system.
- the crystallization rate is high due to the large amount of Sb, and the bonding force between Ga and Sb is large.
- the stability of the amorphous mark is also excellent.
- Non-Patent Document 1 For practical use, various solutions such as initialization characteristics and storage characteristics must be solved. There is no problem.
- Patent Document 1 discloses using a recording material obtained by adding a metal or chalcogenide element M to an alloy having a composition ratio of GaSb of about 50:50.
- alloys near the Ga Sb (atomic%) composition have a melting point of 710 ° C and are crystallized.
- Patent Document 2 discloses a phase-change optical recording medium using an alloy containing GaSb as a main component as a recording material.
- This optical recording medium uses a phase change between crystals to store information.
- the phase change mode is different from that of the present invention, and the modulation factor is 29% at best.
- the phase change between crystals utilizes the difference in reflectivity due to the difference in crystal grain size, and is not suitable for high-density information recording that requires the recording of minute marks. It is difficult to record information at the same density as DVD-ROM.
- Patent Document 1 US Pat. No. 4,818,666
- Patent Document 2 JP-A-61-168145
- Patent Document 3 JP-A-09-286174
- Patent Document 4 JP-A-09-286175
- Non-Patent Document 1 Proceedings of the 14th Symposium on Phase Change Recording, pi Chamcteriza tion of Lra3 ⁇ 4b Phase—change Material oi High—Speed ReWritaole Media ”
- the present invention it is possible to perform overwrite recording at a recording linear velocity of 10 ⁇ (35 mZs) with a uniform reflectivity distribution around the circumference after the initial crystallization and the same capacity as DVD-ROM. It is an object of the present invention to provide a phase-change optical recording medium having a high degree of modulation.
- the crystallization rate can be increased by increasing the amount of Sb from the GaSb eutectic thread, but when the amount of Sb is too large, explosive crystallization peculiar to Sb occurs and grows largely in one direction. It was found that the reflected crystal appeared in a part, and the reflectivity distribution in the circumference became large, resulting in noise.
- Ga, Sn, and In are materials that can perform high-density recording with the same capacity or more as DVD-ROM, can record at a higher linear velocity, and are easier to crystallize and have a higher degree of modulation than GaSb-based materials. We found that recording materials containing Sb were good.
- a phase change type optical recording medium characterized in that recording and erasing can be performed by utilizing a reversible phase change between an amorphous phase and a crystalline phase of a recording layer.
- phase-change optical recording medium according to 1) above, wherein 5 ⁇ a ⁇ 15, 5 ⁇ j8 ⁇ 15, 5 ⁇ 15, and 55 ⁇ 75.
- phase-change optical recording medium according to 1) or 2) above, wherein the reflective layer is made of Ag or an alloy containing at least 80 atomic% of Ag.
- FIG. 1 is a diagram showing a basic layer configuration of an optical recording medium of the present invention.
- FIG. 2 is a view showing an X-ray diffraction spectrum of the recording material of Example 1.
- FIG. 3 is a diagram showing a change in modulation factor in Example 8.
- FIG. 4 is a graph showing the repetition characteristics of Example 4 and Comparative Example 10 at a recording linear velocity of 35 mZs.
- an alloy composed of Ga, Sn, In, and Sb is used as a recording material that can easily perform initial crystallization and achieve high linear velocity recording at 10 ⁇ DVD speed.
- GaSb has a high melting point and good storage stability, but when the crystallization rate is increased by increasing the amount of Sb, crystals with different grain sizes tend to grow, and the reflectance distribution after initialization becomes large, causing noise. .
- the variation in grain size is reduced by reducing the total amount of Sb, and noise is reduced by performing uniform initial crystallization in the circumference.
- the crystallization rate was slowed by reducing the amount of Sb.
- the repetitive recording characteristics deteriorate. If the Sb force is less than 0%, it is difficult to form an amorphous state, and if the Sb content exceeds 80%, the uniformity in the circumference after initialization deteriorates.
- a desired crystallization rate can be obtained by adjusting the amounts of Ga, Sn, and In.
- the composition range should be 5 ⁇ a ⁇ 15, 5 ⁇ j8 ⁇ 15, 5 ⁇ 15, 55 ⁇ 75 ⁇ Preferred! / ,.
- the thickness of the recording layer is usually about 10 to 20 nm.
- FIG. 1 shows a basic layer configuration of the optical recording medium of the present invention.
- a first intermediate layer 2 a phase change recording layer 3, a second intermediate layer 4, and a reflective layer 5 are formed on a substrate 1 by sputtering.
- the protective layer 6 made of a UV curable resin is laminated by a spin coating method. Further, another substrate may be bonded thereon to reinforce or protect the medium.
- the substrate material In general, glass, ceramics, or resin is used as the substrate material, but a resin substrate is preferable in terms of moldability and cost.
- the resin include polycarbonate resin, acryl resin, epoxy resin, polystyrene resin, polyethylene resin, polypropylene resin, silicone resin, and fluorine resin. Polycarbonate resin is preferred from the viewpoint of properties and the like.
- the shape of the substrate may be any of a disk shape, a card shape, a sheet shape and the like. Any thickness such as 1.2 mm, 0.6 mm, and 0.1 mm can be used for the substrate.
- Materials used for the first intermediate layer and the second intermediate layer include SiO, TiO, ZnO, and ZrO.
- Oxides such as 222; nitrides such as A1N, SiN, and TiN; sulfides such as ZnS, InS, and TaS; SiC,
- Carbides such as TiC and ZrC; or mixtures thereof.
- the first intermediate layer serves to protect the recording layer so that impurities such as moisture do not enter the recording layer from the substrate, to prevent thermal damage to the substrate, and to adjust optical characteristics. Therefore, it is preferable to use a material that has a small refractive index n and a small absorption coefficient k that has low heat resistance, which is difficult to transmit moisture, and that has low refractive index.
- the recording layer also serves as a light interference layer that enables effective light absorption of the recording layer, it is desirable that the recording layer have optical characteristics suitable for repeated recording at a high linear velocity.
- Preferred materials include (ZnS) (SiO 2).
- the thickness of the first intermediate layer is set to about 40 to 300 nm, preferably about 60 to 150 nm.
- the second intermediate layer plays a role in adjusting the thermal characteristics of the recording layer. When the thickness of the second intermediate layer is reduced, the heat is easily released, and when the thickness is increased, the heat is hardly released. Further, good adhesion to the recording layer and the reflective layer, high heat resistance, and the like are required. Further, since the recording layer also serves as a light interference layer that enables effective light absorption of the recording layer, it is desirable that the recording layer has optical characteristics suitable for repeated recording at a high linear velocity. Preferred materials are (ZnS) (SiO
- the thickness of the second intermediate layer is 5 to 50 nm, preferably about 5 to 20 nm.
- the reflective layer has high thermal conductivity! Ag or an alloy containing Ag such as Ag-Cu, Ag-Pd, Ag-Ti, etc. It is preferable that The alloy containing Ag preferably contains 80 atomic% or more of Ag.
- the thickness of the reflective layer is preferably from 60 to 300 nm. If the thickness is less than 60 nm, the heat radiation effect cannot be obtained, and it is difficult to form an amorphous phase. If the thickness exceeds 300 nm, interface peeling tends to occur. In particular, in order to obtain a sufficient degree of modulation, the thickness is preferably set to 120 to 250 nm. Pure Ag has the highest heat dissipation effect, but when S is contained in the second intermediate layer, S diffuses to form Ag S and deteriorates.
- Preferred materials include SiC, Si, SiO and the like. Number of layers to improve productivity
- the first aspect of the present invention it is possible to perform overwrite recording at a recording linear velocity of 10 ⁇ DVD speed (35 mZs) with a uniform reflectivity distribution in the circumference after the initial crystallization and the same capacity as the DVD-ROM.
- a phase change optical recording medium can be provided.
- phase-change type optical recording medium having a higher modulation degree at a DVD 10 ⁇ speed (35 mZs).
- Each optical recording medium of the example and the comparative example was produced as follows.
- a first intermediate layer, a phase-change recording layer, and a second intermediate layer are formed on a polycarbonate substrate having a track pitch of 0.74 m and a groove depth of 400 A and having a diameter of 12 cm and a thickness of 0.6 mm by a sputtering method. , An anti-sulfuration layer and a reflective layer were formed in this order.
- the first intermediate layer uses (ZnS) (SiO 2) as a target and has a thickness of 70 nm, and the recording layer is [Table 1].
- the alloy target of the recording layer is weighed in advance, heated and melted in a glass ampule, taken out, crushed by a crusher, and heated and sintered to obtain a disc-shaped target. Shaped.
- the composition ratio of the recording layer after film formation was determined by inductively coupled plasma (ic
- composition ratio was the same as the target charge amount.
- Sequential ICP emission spectrometer SPS4000 manufactured by Seiko Instruments Inc. was used for ICP emission spectroscopy. In Examples and Comparative Examples described later,
- the alloy composition of the recording layer is the same as the alloy composition of the sputtering target.
- an acrylic-based cured resin was applied on the reflective layer by spin coating to a thickness of 5 to 10 m, and then cured by ultraviolet rays to form a protective layer.
- a polycarbonate substrate having a diameter of 12 cm and a thickness of 0.6 mm was further adhered thereon by ultraviolet curing resin to produce optical recording media of Examples and Comparative Examples.
- Initial crystallization was performed by using an initialization device POP120-7AH manufactured by Hitachi Computer Equipment, rotating each of the above optical recording media at a constant linear velocity of 12 mZs, and sending a laser beam with a power density of 20 mWZ wm 2 in the radial direction to 36 ⁇ m. Recording and reproduction were performed on each of these optical recording media by irradiating while moving with mZr using a pickup with a wavelength of 660 nm and NAO.65.
- Jitter is a value obtained by normalizing data to clock jitter ⁇ with the detection window width Tw.
- the evaluation criteria for each evaluation item are as follows.
- Comparative Example 8 O The optical recording medium of Examples 17 to 17 had good uniformity of distribution in the circumference after initialization, and had good jitter after initial recording at 10 ⁇ DVD speed and after recording 100 times. Further, regarding the degree of modulation, in the case of the composition range of Examples 14 to 14, the degree of modulation was 65% or more, at which a stable system was obtained. Regarding storage stability, it was found that the amorphous mark showed good stability with little change in jitter.
- Comparative Example 1 the modulation degree and the recording jitter at 10 ⁇ 10 ⁇ speed recording were bad.
- Comparative Example 2 was particularly poor in repetitive recording characteristics at 10 ⁇ 10 ⁇ speed and in-circumferential uniformity after initial crystallization.
- Comparative Example 3 the uniformity of the distribution in the circumference after the initial crystallization was poor!
- Comparative Example 4 the crystallization speed was too high to make it amorphous, and it was not possible to record at 10 ⁇ 10 ⁇ speed.
- Comparative Example 5 the distribution uniformity in the circumference after the initial crystallization was good, but the degree of modulation at 10 ⁇ 10 ⁇ speed recording was small, and the recording jitter was bad.
- An optical recording medium was prepared in the same manner as in Example 2 except that the thickness of the reflective layer was changed to 40 nm, 60 nm, 120 nm, 140 nm, 200 nm, 250 nm, and 300 nm, and the degree of modulation at a recording linear velocity of 35 mZs was obtained. Was examined. The results are shown in Figure 3.
- the modulation is 60% or more, and especially when the thickness is between 120 and 250 ⁇ m, the modulation is 65% or more, which is sufficient for obtaining a stable system.
- the modulation is 60% or more, and especially when the thickness is between 120 and 250 ⁇ m, the modulation is 65% or more, which is sufficient for obtaining a stable system.
- An optical recording medium was prepared in the same manner as in Example 4 except that the reflective layer material was changed to AlTi (Til wt%), and the degree of modulation at a recording linear velocity of 35 mZs was examined. It was small.
- FIG. 4 shows the repetition characteristics at a recording linear velocity of 35 mZs of Example 4 and Comparative Example 10 Reference Example.
- the graph connecting the black diamond points shows the result of Example 4
- the graph connecting the black triangle points shows the result of the reference example.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04799504A EP1690692A4 (en) | 2003-11-05 | 2004-11-04 | OPTICAL RECORDING MEDIUM WITH PHASE CHANGE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003375817A JP3885051B2 (ja) | 2003-11-05 | 2003-11-05 | 相変化型光記録媒体 |
JP2003-375817 | 2003-11-05 |
Publications (1)
Publication Number | Publication Date |
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WO2005044577A1 true WO2005044577A1 (ja) | 2005-05-19 |
Family
ID=34567090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016347 WO2005044577A1 (ja) | 2003-11-05 | 2004-11-04 | 相変化型光記録媒体 |
Country Status (3)
Country | Link |
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EP (1) | EP1690692A4 (ja) |
JP (1) | JP3885051B2 (ja) |
WO (1) | WO2005044577A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPWO2015068738A1 (ja) * | 2013-11-05 | 2017-03-09 | コニカミノルタ株式会社 | 透明導電体 |
WO2015125677A1 (ja) * | 2014-02-19 | 2015-08-27 | コニカミノルタ株式会社 | 透明導電体 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63201927A (ja) * | 1987-02-13 | 1988-08-22 | イーストマン コダック カンパニー | 1回書込非晶質薄フィルム光学記録層を含む記録要素 |
JPS63298726A (ja) * | 1987-02-13 | 1988-12-06 | イーストマン コダック カンパニー | 1回書込非晶質薄フィルム光学記録層を含む記録要素 |
JPH04501742A (ja) * | 1988-11-21 | 1992-03-26 | イーストマン コダック カンパニー | 光学記録に用いるための合金 |
JPH09286174A (ja) * | 1996-04-23 | 1997-11-04 | Mitsubishi Chem Corp | 光記録媒体 |
JPH09286175A (ja) * | 1996-04-23 | 1997-11-04 | Mitsubishi Chem Corp | 光記録媒体 |
JPH11286177A (ja) * | 1998-01-26 | 1999-10-19 | Eastman Kodak Co | 超高感度のマ―ク可能な相変化層を含む記録素子 |
JP2002011958A (ja) * | 2000-04-28 | 2002-01-15 | Mitsubishi Chemicals Corp | 光記録媒体及び光記録再生方法 |
JP2004152464A (ja) * | 2002-09-04 | 2004-05-27 | Ricoh Co Ltd | 光記録媒体 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4960680A (en) * | 1987-02-13 | 1990-10-02 | Eastman Kodak Company | Recording elements comprising write-once thin film alloy layers |
US5077181A (en) * | 1988-08-09 | 1991-12-31 | Eastman Kodak Company | Optical recording materials comprising antimony-tin alloys including a third element |
US5196294A (en) * | 1990-09-17 | 1993-03-23 | Eastman Kodak Company | Erasable optical recording materials and methods based on tellurium alloys |
CA2416149A1 (en) * | 2001-04-12 | 2002-10-24 | Koninklijke Philips Electronics N.V. | Rewritable optical data storage medium and use of such a medium |
JP3977740B2 (ja) * | 2002-12-27 | 2007-09-19 | 株式会社リコー | 相変化型光記録媒体とその記録方法 |
-
2003
- 2003-11-05 JP JP2003375817A patent/JP3885051B2/ja not_active Expired - Fee Related
-
2004
- 2004-11-04 WO PCT/JP2004/016347 patent/WO2005044577A1/ja active Application Filing
- 2004-11-04 EP EP04799504A patent/EP1690692A4/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63201927A (ja) * | 1987-02-13 | 1988-08-22 | イーストマン コダック カンパニー | 1回書込非晶質薄フィルム光学記録層を含む記録要素 |
JPS63298726A (ja) * | 1987-02-13 | 1988-12-06 | イーストマン コダック カンパニー | 1回書込非晶質薄フィルム光学記録層を含む記録要素 |
JPH04501742A (ja) * | 1988-11-21 | 1992-03-26 | イーストマン コダック カンパニー | 光学記録に用いるための合金 |
JPH09286174A (ja) * | 1996-04-23 | 1997-11-04 | Mitsubishi Chem Corp | 光記録媒体 |
JPH09286175A (ja) * | 1996-04-23 | 1997-11-04 | Mitsubishi Chem Corp | 光記録媒体 |
JPH11286177A (ja) * | 1998-01-26 | 1999-10-19 | Eastman Kodak Co | 超高感度のマ―ク可能な相変化層を含む記録素子 |
JP2002011958A (ja) * | 2000-04-28 | 2002-01-15 | Mitsubishi Chemicals Corp | 光記録媒体及び光記録再生方法 |
JP2004152464A (ja) * | 2002-09-04 | 2004-05-27 | Ricoh Co Ltd | 光記録媒体 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1690692A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP2005138363A (ja) | 2005-06-02 |
EP1690692A4 (en) | 2008-11-26 |
JP3885051B2 (ja) | 2007-02-21 |
EP1690692A1 (en) | 2006-08-16 |
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