WO2010090004A1 - 光学的情報記録媒体、記録方法、再生方法および記録再生装置 - Google Patents
光学的情報記録媒体、記録方法、再生方法および記録再生装置 Download PDFInfo
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- WO2010090004A1 WO2010090004A1 PCT/JP2010/000630 JP2010000630W WO2010090004A1 WO 2010090004 A1 WO2010090004 A1 WO 2010090004A1 JP 2010000630 W JP2010000630 W JP 2010000630W WO 2010090004 A1 WO2010090004 A1 WO 2010090004A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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Definitions
- the present invention relates to an optical information recording medium for recording / reproducing information by a light beam such as a laser beam, a recording method, a reproducing method, and a recording / reproducing apparatus for the optical information recording medium.
- optical information recording media capable of recording information by laser light irradiation have been widely researched, developed and commercialized.
- information can be recorded, a rewritable type that can erase or rewrite already recorded information, and information can be recorded, but the recorded information can be erased. Or write-once that cannot be rewritten with new information.
- the write-once optical information recording media for example, a material in which an oxide is used as a base material and a metal element is dispersed, more specifically, TeO x (0 ⁇ 0), which is a mixture of Te and TeO 2 is used.
- An optical information recording medium having an information recording film containing x ⁇ 2) in an information layer is known (for example, see Patent Document 1).
- the recording film containing TeO x is used in an amorphous phase after forming the recording film without performing an initialization process such as laser annealing. That is, after forming a recording film containing TeO x , information can be recorded in an amorphous phase without heat treatment. For this reason, there is an advantage that the optical information recording medium is easy to manufacture and can be manufactured at low cost.
- the recording film When such an optical information recording medium is irradiated with a laser beam having a predetermined intensity, the recording film is changed from an amorphous phase to a crystalline phase in a region irradiated with the laser, and a recording mark is formed.
- a combination of a space and a mark represented by a length based on a signal modulated by information to be recorded is formed on a track of the recording layer.
- the reflectance differs greatly between an amorphous phase and a crystalline phase in a recording film containing TeO x , if a track on which information is recorded is scanned with a laser beam having an intensity that does not cause a phase change in the recording film, Reflected light having an intensity change corresponding to the space and the mark can be obtained, and information recorded on the optical information recording medium can be reproduced. Since the change from the amorphous phase to the crystalline phase in the recording film containing TeO x is an irreversible process, it cannot be corrected or erased by overwriting information.
- an optical information recording medium having a larger recording capacity has been demanded.
- the laser light spot diameter is reduced by shortening the wavelength of the laser light or by increasing the numerical aperture of the objective lens for condensing the laser light, A method of improving the recording surface density is generally used.
- an optical information recording medium having a multilayer structure in which a plurality of information layers are laminated has been put into practical use in recent years.
- an optical information recording medium in which the composition of the recording material in which Pd, Au or the like is added to TeO x or the thickness of the recording film is adjusted has been proposed (for example, , See Patent Document 2). Further, when the recording density of the optical information recording medium is increased, the intensity of reflected light is reduced, and thermal interference between marks becomes a problem. In order to solve these problems, by providing a reflective film adjacent to the recording film, the optical absorptive effect is used to increase the light absorption rate of the recording film to improve the recording sensitivity, and also occurs in the recording film. It has been proposed to dissipate heat to the reflective film and suppress thermal interference between marks (see, for example, Patent Document 3).
- the recording film is easily damaged by a thermal load due to laser heating.
- the quality of the reproduction signal is deteriorated, for example, the reproduction signal contains a lot of noise.
- the thermal load received during recording does not immediately deteriorate the quality of the reproduced signal, the effect of the thermal load becomes obvious and the reproduced signal deteriorates by storing the optical information recording medium for a long time. Is also possible.
- An object of the present invention is to solve such problems, and to provide an optical information recording medium with high reproduction signal quality and high storage reliability in high density and high linear velocity recording.
- the optical information recording medium of the present invention comprises a substrate, a cover layer, and a first information layer sandwiched between the substrate and the cover layer, and by irradiating a light beam from the cover layer side, An optical information recording medium for recording information on a first information layer and reproducing information recorded on the first information layer, wherein the first information layer includes a recording film, the recording film, and the cover layer
- the distance between the cover layer and the recording film is 0.5 nm or more and 12 nm or less.
- the recording film When the distance between the cover layer and the recording film is 0.5 nm or more and 12 nm or less, the recording film can be protected from thermal damage, and peeling of the protective film can be suppressed. It is possible to realize an optical information recording medium with good reproduction signal quality in speed recording and high storage reliability.
- the optical information recording medium further includes a second information layer provided between the substrate and the first information layer.
- an optical information recording medium having a large recording capacity in which information layers are stacked can realize an optical information recording medium with high reproduction signal quality and high storage reliability in high density and high linear velocity recording. be able to.
- the recording film contains a write-once recording material.
- the write-once recording material is selected from the group consisting of Cr—O, Zn—O, Ga—O, In—O, Sn—O, Sb—O, Bi—O, and Te—O. Including at least one of the following.
- the first information layer further includes a reflective film provided between the recording film and the substrate.
- the first information layer has an intermediate film provided between the recording film and the reflective film.
- the protective film includes at least one selected from the group consisting of Zn—O, Te—O, and Sn—O, and in the protective film, Zn, Te, and Sn for all atoms other than oxygen.
- the total ratio is 50 at% or more.
- the protective film includes at least one selected from the group consisting of Zn—O, Te—O, and Sn—O, Cr—O, Sb—O, Bi—O, In—O, and Ga—.
- the total ratio of Zn, Te and Sn to all atoms other than oxygen is 33 at% or more and 96 at% or less, and all atoms other than oxygen
- the total ratio of Cr, Sb, Bi, In, and Ga is 4 at% or more and 67 at% or less.
- the groove pitch of the first information layer is 1 ⁇ m or less.
- information is recorded on the optical information recording medium described above with a light beam having a wavelength of 450 nm or less.
- the method for reproducing an optical information recording medium of the present invention reproduces information recorded on any one of the above optical information recording media with a light beam having a wavelength of 450 nm or less.
- the recording / reproducing apparatus of the present invention records information on the optical information recording medium described above with a light beam having a wavelength of 450 nm or less, and information recorded on the optical information recording medium has a wavelength of 450 nm or less. At least one of reproduction with the light beam.
- the recording film when the distance between the cover layer and the recording film is 0.5 nm or more and 12 nm or less, the recording film can be protected from thermal damage, and peeling of the protective film can be suppressed.
- FIG. 1 is a schematic partial sectional view showing an embodiment of an optical information recording medium according to the present invention. It is a typical fragmentary sectional view which shows other embodiment of the optical information recording medium by this invention. It is a typical fragmentary sectional view which shows other embodiment of the optical information recording medium by this invention. It is the schematic which shows the principal part in one Embodiment of the recording / reproducing apparatus by this invention.
- FIG. 1 is a schematic partial sectional view showing an embodiment of an optical information recording medium according to the present invention.
- the optical information recording medium shown in FIG. 1 includes a substrate 1, a cover layer 5, and a first information layer 2 sandwiched between the substrate 1 and the cover layer 5.
- the first information layer 2 includes at least a recording film 3 and a protective film 4.
- the protective film 4 is disposed between the recording film 3 and the cover layer 5.
- the first information is obtained by condensing a light beam 6 such as a laser beam with an objective lens 7 and irradiating the collected light beam 6 on the first information layer 2 from the cover layer 5 side.
- Information is recorded on the layer 2 or information recorded on the first information layer 2 is reproduced.
- the first information layer 2 may further include a reflective film 8 provided between the recording film 3 and the substrate 1. Further, an intermediate film 9 provided between the recording film 3 and the reflective film 8 may be provided.
- the optical information recording medium may include two or more information layers. Specifically, as shown in FIG. 3, the optical information recording medium may further include a second information layer 11 provided between the substrate 1 and the first information layer 2. In this case, it is preferable that the separation layer 10 is provided between the first information layer 2 and the second information layer 11. Further, the optical information recording medium may include three or more information recording layers. When the optical information recording medium includes a plurality of information layers, the plurality of information layers may be called L0 layer, L1 layer,.
- the substrate 1 supports the first information layer 2 and the second information layer 11.
- the material of the substrate polycarbonate resin, polymethyl methacrylate resin, polyolefin resin, norbornene resin, ultraviolet curable resin, or a combination of these may be used.
- the thickness of the substrate 1 is not particularly limited, but a substrate having a thickness of about 0.01 to 3.0 mm can be used.
- a spiral groove is formed on the surface of the substrate 1 in contact with the first information layer 2 or the second information layer 11.
- the pitch of the grooves is preferably 1 ⁇ m or less in order to increase the recording density. This groove corresponds to a groove formed in the first information layer 2 or the second information layer 11.
- the cover layer 5 prevents the information layer 2 from being scratched or scratched, and prevents the information layer 2 from being exposed to the atmosphere and being oxidized. In the optical information medium, the distance from the surface of the cover layer 5 on which the light beam is incident to the first information layer 2 is adjusted.
- a polycarbonate resin, a polymethyl methacrylate resin, a polyolefin resin, a norbornene resin, an ultraviolet curable resin, glass, or a combination of these may be used.
- the thickness of the cover layer 5 is not particularly limited, but is preferably about 0.01 to 1.5 mm.
- the thickness of the cover layer 5 is preferably about 0.03 to 0.3 mm.
- the cover layer 5 is thin, for example, when the thickness of the cover layer 5 is 0.3 mm or less, a sheet formed of the above-described material is pasted on the information layer 2 or an ultraviolet curable resin is used. Is applied by spin coating and cured by ultraviolet irradiation to form the cover layer 5.
- the separation layer 10 is provided between the two information layers.
- the separation layer 10 adjusts the distance between the two information layers.
- a spiral groove may be formed on the surface of the separation layer 10 on the first information layer 2 side.
- an ultraviolet curable resin or the like can be used as a material of the separation layer 10.
- the separation layer 10 has a thickness of at least the numerical aperture NA of the objective lens 7 so that crosstalk from other layers is reduced when reproducing one of the first information layer 2 and the second information layer 11.
- the depth of focus is preferably equal to or greater than the depth of focus determined by the wavelength ⁇ of the laser light 6.
- the position of each information layer is preferably adjusted by the separation layer 10 so that the objective lens 7 can focus the light beam 6 on all the information layers.
- the thickness of the separation layer 10 may be made thinner than 5 ⁇ m.
- the first information layer 2 includes at least the recording film 3 and the protective film 4.
- the recording film 3 includes a write-once recording material that undergoes a phase change from an amorphous phase to a crystalline phase upon irradiation with a light beam.
- the write-once recording material is at least selected from the group consisting of Cr—O, Zn—O, Ga—O, In—O, Sn—O, Sb—O, Bi—O, and Te—O.
- Cr—O, Zn—O and the like mean chromium oxide (CrO x ) and zinc oxide (ZnO x ), respectively.
- the recording film 3 includes, as an additive, Te, Sb, Bi, Ge, Sn, Ga, In, Pd, and the like, for the purpose of causing an optical change by crystallization at a high temperature by heating. At least one selected from the group consisting of Au, Pt, Ni, Ag and Cu may be added to the write-once recording material.
- Te—O is used as a base material of a write-once recording material
- Te, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge are used as additives.
- At least one element selected from the group consisting of Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au, and Bi is added. It can be added to the recording material of the mold.
- the recording film 3 preferably contains 80 at% or more, more preferably 90 at% or more of the main component containing the above-mentioned base material and additives. Further, in addition to the main components described above, the recording film 3 may have other oxides, nitrides and fluorides for the purpose of adjusting the crystallization speed, thermal conductivity, optical constants, etc., or improving heat resistance or moisture resistance. , Carbide, sulfide, boride, at least one selected from the group consisting of non-metallic elements such as O, N, F, C, S, and B is preferably within 10 at% of the entire recording film 2 as necessary. May be included within a range of 5 at% or less.
- the film thickness of the recording film 3 is preferably 2 nm or more and 70 nm or less, and more preferably 4 nm or more and 40 nm or less.
- the recording film 3 is thinner than 2 nm, sufficient reflectivity and reflectivity change cannot be obtained, and the C / N ratio (carrier-to-noise ratio) of the reproduction signal becomes small.
- the thickness is larger than 70 nm, the thermal diffusion in the thin film surface of the recording film 3 becomes relatively large, so that the outline of the recording mark becomes unclear and the C / N ratio of the reproduction signal becomes small in high-density recording.
- spiral grooves corresponding to the grooves formed in the substrate 1 are formed.
- a spiral convex portion is formed between the grooves.
- the pitch of the grooves formed in the recording film 3 is also preferably 1 ⁇ m or less.
- Grooves and protrusions are called grooves and lands, respectively.
- grooves or / and lands are used as tracks for recording information.
- the protective film 4 mainly protects the recording film 3 from moisture and protects the recording film 3 from thermal damage when the recording film is heated by the light beam. Suppresses deformation. For this reason, it is preferable that the protective film 4 is made of a material having high heat resistance.
- the protective film 4 is preferably made of an inorganic material, and more preferably made of an inorganic dielectric material. More specifically, the protective film 4 includes at least one selected from the group consisting of Zn—O, Te—O, and Sn—O.
- the total ratio of Zn, Te, and Sn to all atoms other than oxygen is preferably 50 at% or more.
- the protective film 4 is made of at least one selected from the group consisting of Zn—O, Te—O and Sn—O, and Cr—O, Sb—O, Bi—O, In—O and Ga—O. Each includes at least one selected from the group.
- the total ratio of Zn, Te, and Sn to all atoms other than oxygen is 33 at% or more and 96 at% or less, and Cr, Sb, Bi, In, and Ga with respect to all atoms other than oxygen. Is preferably 4 at% or more and 67 at% or less.
- material components other than those described above can be added as long as they are within a range of 10 at% that does not impair the original function.
- the protective film 4 may be configured by oxidizing the surface of the recording film 3.
- the thickness of the protective film 4 is preferably 0.5 nm or more and 12 nm or less, and more preferably 1 nm or more and 5 nm or less.
- the protective film 4 mainly fulfills the functions of moisture-proofing the recording film 3, protecting the recording film 3 from thermal damage, and suppressing deformation of the cover layer 5.
- the protective film should be thicker in the optical information recording medium.
- the protective film is generally 100 nm or more, and in the conventional BD, the thickness of the protective film is 20 nm.
- the above-described function is sufficiently performed even when the thickness of the protective film is 0.5 nm to 12 nm which is much thinner than the conventional film.
- the thickness of the protective film 4 is several tens of nanometers or more as in the prior art, when the optical information recording medium is stored for a long period of time or when it is stored at high temperature and high humidity, the film stress is applied to the protective film 4. Is generated, and peeling occurs between the recording film 3 and the protective film 4, and the boundary of the mark becomes unclear at the peeled portion, or the protective film is uneven, and the quality of the reproduction signal is considered to deteriorate. I understood that.
- the distance between the cover layer 5 and the recording film 3. Is preferably 0.5 nm or more and 12 nm or less, and more preferably 1 nm or more and 5 nm or less.
- the protective film 4 Since the protective film 4 is made of the above-described material and has the above-described thickness, the protective film 4 (1) protects the recording film 3 from thermal damage, and (2) the recording film 3 or the like. Good adhesion to adjacent materials, no peeling, corrosion or diffusion even under high temperature and high humidity conditions, (3) High transparency and appropriate refractive index, and optical change of recording film 3 (4) It is thermally stable itself, and it can satisfy the conditions that the particle size and composition distribution do not fluctuate even at high temperature and high humidity.
- the optical information recording medium of the present embodiment has high storage reliability even in high density and high linear velocity recording.
- a conventional optical information recording medium when information is recorded at a linear velocity of, for example, about 4 m / s, information is deteriorated by storage under a high temperature and high humidity condition (for example, a temperature of 85 ° C. and a relative humidity of 85%). Even when no recording occurs, when recording is performed at a linear velocity that is twice or more, deterioration of information may be observed. In order to increase the linear velocity, it is necessary to record information using a light beam having a stronger power, and the thermal load on the recording film becomes larger, so that information is considered to deteriorate.
- the optical information recording medium of the present embodiment keeps the distance between the cover layer 5 and the recording film 3 within a certain range as described above, so that information can be recorded even in severer high linear velocity recording. Can be prevented.
- the optical information recording medium having a plurality of information layers as shown in FIG. The light beam for performing needs to be transmitted through the first information layer. For this reason, it is necessary to reduce the film thickness of the recording film 3 and the reflective film 8 of the first information layer 2. In this case, deterioration of information is likely to proceed when stored under high temperature and / or high humidity conditions.
- the optical information recording medium of this embodiment can exhibit particularly high storage reliability when it includes a plurality of information layers.
- the reflective film 8 has a function of reflecting the light beam 6.
- a metal such as Ag, Au, Al, Cu or an alloy containing these metals can be used.
- the sales company film 8 is made of an Ag alloy having a high reflectance. Thereby, better reproduction signal quality can be obtained in high density and high linear velocity recording.
- the additive element to Ag is not particularly limited. For example, Pd, Pt, Ni, Ru, Au, Cu, Zn, Al, Ga, In, Si, which have a high effect of preventing aggregation and refining the particle size in a small amount.
- the content of the additive element is 0.01 at% or more and 10 at% or less with respect to the entire reflective film 5.
- it is 0.05 at% or more and 5 at% or less.
- the intermediate film 9 functions to alleviate and adjust the heat dissipation rate from the recording film 3 to the reflection film 8 and further adjust the optical characteristics of the entire information layer by the optical interference effect.
- the material of the intermediate film 9 include oxides such as Y, Ce, Ti, Zr, Nb, Ta, Co, Zn, Al, Si, Ge, Sn, Pb, Sb, Bi, Te, Ti, Zr, Nb, Ta, Cr, Mo, W, B, Al, Ga, In, Si, Ge, Sn, Pb and other nitrides, Ti, Zr, Nb, Ta, Cr, carbides such as Mo, W and Si, Zn , Sulfides such as Cd, selenides or tellurides, fluorides such as rare earth such as Mg, Ca and La, simple substances such as C, Si and Ge, or a mixture thereof.
- the reflective film 8 contains Ag or an Ag alloy
- the sulfide is used as the material of the intermediate film 9
- the reflective film 8 may be corroded.
- the intermediate film 9 is preferably made of a material that does not contain sulfide. Further, the intermediate film 9 may be made of the same material as the protective film 4.
- the film thickness of the intermediate film 9 is preferably 2 nm or more and 40 nm or less, and more preferably 5 nm or more and 20 nm or less.
- the first information layer 2, or the first information layer 2, the separation layer 10, and the second information layer 11 are sequentially formed on the cover layer 5, and then the information layer and the separation layer are formed.
- the first information layer 2 or the second information layer 11, the separation layer 10, and the first information layer 2 are sequentially formed on the substrate 1, and the cover layer 5 is formed or bonded.
- a typical information recording medium may be manufactured.
- the latter is suitable when the numerical aperture NA of the objective lens 7 is as large as 0.8 or more and the thickness of the substrate 1 is 0.3 mm or less.
- the concave / convex patterns such as grooves and address signals that are guide grooves for the laser beam 6 are formed on the surfaces of the substrate 1 and the separation layer 10, that is, a desired concave / convex pattern such as a stamper is formed in advance. It needs to be transcribed. At that time, in particular, when the layer thickness is thin as in the case of the separation layer 10 and the usual injection method is difficult, the 2P method (photo-polymerization method) can be used.
- Each thin film of the first information layer 2 and the second information layer 11 is formed by vapor-phase thin film deposition such as vacuum evaporation, sputtering, ion plating, CVD (Chemical Vapor Deposition), MBE (Molecular Beam Epitaxy), etc. It can be formed by the method.
- a target or an evaporation source having the same composition as that of the thin film to be formed may be used in order to form a thin film having a desired composition.
- the target material composition of each film and the composition of the actually formed thin film were substantially equivalent.
- the target material composition may differ from the actually formed thin film composition.
- the thickness of each thin film can be controlled by adjusting the film formation time and the film growth rate.
- each thin film that is, constituent elements and composition ratio thereof are determined by methods such as Auger electron spectroscopy, X-ray photoelectron spectroscopy, or secondary ion mass spectrometry (for example, Society of Applied Physics / Thin Film / Surface Physics Society). Chapter “Thin Film Production Handbook” Kyoritsu Publishing Co., Ltd., 1991).
- FIG. 4 shows a minimum recording / reproducing apparatus that records at least one of recording information on the optical information recording medium of the present invention and reproducing information recorded on the optical information recording medium.
- An example of composition is shown roughly.
- the light source 12 preferably emits a light beam 6 having a short wavelength, and preferably emits a light beam having a wavelength of 450 nm or less.
- the light beam 6 emitted from the laser diode as the light source 12 passes through the half mirror 6 and enters the objective lens 7.
- the objective lens 7 condenses the light beam 6 and applies a beam spot of a predetermined size to the recording film 3 (FIG. 1) of the first information layer 2 of the optical information recording medium 15 placed on the turntable of the motor 14. ) Form on top.
- the optical information recording medium 15 the optical information recording medium of the above-described embodiment is used.
- the light source 6 is driven by a signal modulated by the information to be recorded, so that the modulated light beam 6 irradiates the recording film 3 of the optical information recording medium 15.
- the optical information recording medium 15 is rotated by the motor 14, the light beam 6 scans the track of the optical information recording medium 15 to form a recording mark.
- the track of the optical information recording medium 15 is scanned with the light beam 6 having a lower power than at the time of recording, and the reflected light is detected by the half mirror 13 with the detector 16. Reflect to.
- the detector 16 converts the reflected light into an electrical signal, and processes the electrical signal, whereby information recorded on the optical information recording medium 15 can be obtained as a reproduction signal.
- the recording / reproducing apparatus of the present embodiment is preferably used particularly when information is recorded on the optical information recording medium 15 at a high linear recording speed (high speed) and a high recording density.
- optical information recording media including protective films of various materials and thicknesses were prepared and the optical information recording media were evaluated.
- the following examples do not limit the invention.
- Example 1 Disks 1 to 22 were produced as optical information recording media including one information layer.
- a substrate made of polycarbonate resin having a diameter of about 12 cm, a thickness of about 1.1 mm, a groove pitch of 0.32 ⁇ m, and a groove depth of about 20 nm was previously formed.
- a reflective film having a thickness of 60 nm made of Ag 99 Bi 1 and an intermediate film having a thickness of 20 nm made of (ZnO) 90 (Cr 2 O 3 ) 10 are formed.
- a recording film made of Te 36 O 54 Pd 10 having a thickness of 25 nm, various materials, and protective films having various thicknesses were formed in this order by sputtering.
- a cover layer having a thickness of 100 ⁇ m was formed on the surface of the first information layer using an ultraviolet curable resin.
- the materials and film thicknesses shown in Table 1 were used, and disks 1 to 22 were obtained.
- the optical system having a wavelength of 405 nm and a lens numerical aperture of 0.85 is used for the groove of each disk, that is, the convex portion of the spiral groove as viewed from the laser light incident side, and the linear velocity is 4.9 m.
- Laser light was irradiated while rotating at / s and 9.8 m / s, and single signals with frequencies of 16.5 MHz and 33.0 MHz were recorded, respectively.
- the C / N ratio after acceleration was large at any linear velocity, and the storage reliability was insufficient. Further, in the disks 8, 9, 20 and 21 in which the thickness of the protective film is 15 nm and 20 nm, the C / N ratio is greatly reduced after acceleration at a high linear velocity (9.8 m / s), so that the storage reliability is improved. Sex was insufficient. On the other hand, the discs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, 15, 16, 17, 18, 19 and 22 have the C after acceleration in any linear velocity recording. The decrease in the / N ratio was small, and good storage reliability was shown. From the above, it was found that when the distance between the cover layer and the recording film is 0.5 nm to 12 nm, good storage reliability can be ensured.
- Disks 23 to 44 were produced as optical information recording media including two information layers.
- a substrate made of polycarbonate resin having a diameter of about 12 cm, a thickness of about 1.1 mm, a groove pitch of 0.32 ⁇ m, and a groove depth of about 20 nm was previously formed.
- a reflective film having a thickness of 60 nm made of Ag 99 Bi 1 and an intermediate film having a thickness of 20 nm made of (ZnO) 90 (Cr 2 O 3 ) 10 are formed.
- a recording film made of Te 36 O 54 Pd 10 having a thickness of 25 nm and a protective film made of (ZnO) 90 (Cr 2 O 3 ) 10 having a thickness of 3 nm were laminated in this order by sputtering.
- a groove pattern similar to that of the protective substrate was transferred using an ultraviolet curable resin by the 2P method to form a separation layer having a thickness of about 25 ⁇ m.
- a protective film made of 54 Pd 10 having a film thickness of 15 nm, various materials, and protective films having various thicknesses was formed by sputtering.
- a cover layer having a thickness of 75 ⁇ m was formed on the surface of the first information layer using an ultraviolet curable resin.
- the materials and film thicknesses shown in Table 2 were used, and the disks 23 to 44 were used.
- the groove of the first information layer and the second information layer of each disk that is, the wavelength of 405 nm with respect to the portion of the spiral groove that is convex toward the front when viewed from the laser light incident side
- a single signal with a frequency of 16.5 MHz and 33.0 MHz is recorded by irradiating with laser light while rotating at linear speeds of 4.9 m / s and 9.8 m / s. did.
- the C / N ratio after acceleration was large at any linear velocity, and the storage reliability was insufficient.
- the C / N ratio greatly decreases after acceleration at a high linear velocity (9.8 m / s). Storage reliability was insufficient.
- the discs 24, 25, 26, 27, 28, 29, 32, 33, 34, 36, 37, 38, 39, 40, 41, and 44 have the C after acceleration in any linear velocity recording. The decrease in the / N ratio was small, and good storage reliability was shown.
- each disk of Example 2 has a C / N ratio before acceleration that is approximately 2 dB lower than that of the disk of Example 1. For this reason, if the margin of the C / N ratio is small and the C / N ratio is lowered by the acceleration test, the quality of the reproduced signal is not sufficient. Expected to increase. In such a case, according to the present invention, since the storage reliability is high, it is possible to suppress a decrease in the C / N ratio due to acceleration. Therefore, the present invention can be suitably used for an optical information recording medium having two or more recording layers.
- Example 1 and Example 2 show that the present invention can be suitably used for an optical information recording medium having one information layer and two or more information layers for an optical information recording medium. .
- the optical information recording medium of the present invention can be suitably used as a high recording density, high speed optical information recording medium for storing data that can be digitized such as video, music, and information.
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Abstract
Description
情報層を1つ含む光学的情報記録媒体としてディスク1から22を作製した。基板として、ポリカーボネイト樹脂からなり、直径約12cm、厚さ約1.1mmで、溝ピッチ0.32μm、溝深さ約20nmのスパイラル状の溝があらかじめ形成されたものを用いた。この基板の溝が形成された表面上に、第1情報層として、Ag99Bi1からなる膜厚60nmの反射膜、(ZnO)90(Cr2O3)10からなる膜厚20nmの中間膜、Te36O54Pd10からなる膜厚25nmの記録膜、種々の材料および種々の厚さの保護膜をそれぞれスパッタリング法により、この順で形成した。この第1情報層の表面上に、紫外線硬化樹脂を用いて厚さ100μmのカバー層を形成した。
情報層を2つ含む光学的情報記録媒体としてディスク23から44を作製した。基板として、ポリカーボネイト樹脂からなり、直径約12cm、厚さ約1.1mmで、溝ピッチ0.32μm、溝深さ約20nmのスパイラル状の溝があらかじめ形成されたものを用いた。この基板の溝が形成された表面上に、第2情報層として、Ag99Bi1からなる膜厚60nmの反射膜、(ZnO)90(Cr2O3)10からなる膜厚20nmの中間膜、Te36O54Pd10からなる膜厚25nmの記録膜、(ZnO)90(Cr2O3)10からなる膜厚3nmの保護膜の各膜をスパッタリング法によりこの順に積層した。この第2情報層の表面上に、紫外線硬化性樹脂を用いて2P法により保護基板と同様の溝パターンを転写し、厚さ約25μmの分離層を形成した。この分離層の表面上に、第1情報層として、Ag99Bi1からなる膜厚15nmの反射膜、(ZnO)90(Cr2O3)10からなる膜厚20nmの中間膜、Te36O54Pd10からなる膜厚15nmの記録膜、種々の材料および種々の厚さの保護膜の保護膜をそれぞれスパッタリング法により、こので形成した。この第1情報層の表面上に、紫外線硬化樹脂を用いて厚さ75μmのカバー層を形成した。
2 第1情報層
3 記録膜
4 保護膜
5 カバー層
6 レーザー光
7 対物レンズ
8 反射膜
9 中間膜
10 分離層
11 第2情報層
12 レーザーダイオード
13 ハーフミラー
14 モーター
15 光学的情報記録媒体
16 フォトディテクター
Claims (12)
- 基板と、
カバー層と、
前記基板および前記カバー層に挟まれた第1情報層と
を備え、前記カバー層の側から光ビームを照射することによって、前記第1情報層に情報を記録し、前記第1情報層に記録された情報を再生する光学的情報記録媒体であって、
前記第1情報層は、記録膜と、前記記録膜と前記カバー層との間に配置された保護膜とを含み、
前記カバー層と前記記録膜との間の距離が0.5nm以上12nm以下である光学的情報記録媒体。 - 前記基板と前記第1情報層との間に設けられた第2情報層をさらに備える請求項1に記載の光学的情報記録媒体。
- 前記記録膜は、追記型の記録材料を含む請求項2に記載の光学的情報記録媒体。
- 前記追記型の記録材料は、Cr-O、Zn-O、Ga-O、In-O、Sn-O、Sb-O、Bi-OおよびTe-Oからなる群から選ばれる少なくとも1つを含む請求項3に記載の光学的情報記録媒体。
- 前記第1情報層は前記記録膜と前記基板との間に設けられた反射膜をさらに有する請求項4に記載の光学的情報記録媒体。
- 前記第1情報層は、前記記録膜と前記反射膜との間に設けられた中間膜を有する請求項5に記載の光学的情報記録媒体。
- 前記保護膜は、Zn-O、Te-OおよびSn-Oからなる群から選ばれる少なくとも1つを含み、
前記保護膜において、酸素以外の全原子に対するZn、TeおよびSnの合計の割合が50at%以上である請求項6に記載の光学的情報記録媒体。 - 前記保護膜は、Zn-O、Te-OおよびSn-Oからなる群から選ばれる少なくとも1つと、Cr-O、Sb-O、Bi-O、In-OおよびGa-Oからなる群から選ばれる少なくとも1つをそれぞれ含み、
前記保護膜において、酸素以外の全原子に対する、Zn、TeおよびSnの合計の割合が33at%以上96at%以下であり、酸素以外の全原子に対する、Cr、Sb、Bi、InおよびGaの合計の割合が4at%以上67at%以下である請求項7に記載の光学的情報記録媒体。 - 前記第1情報層の溝のピッチが1μm以下である請求項8に記載の光学的情報記録媒体。
- 請求項1から9のいずれかに記載の光学的情報記録媒体に、波長450nm以下の光ビームで情報を記録する光学的情報記録媒体の記録方法。
- 請求項1から9のいずれかに記載の光学的情報記録媒体に記録された情報を波長450nm以下の光ビームで再生する光学的情報記録媒体の再生方法。
- 請求項1から9のいずれかに記載の光学的情報記録媒体に、波長450nm以下の光ビームで情報を記録すること、および、光学的情報記録媒体に録された情報を波長450nm以下の光ビームで再生を行うことの少なくとも一方を行う記録再生装置。
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CN201080004775.6A CN102282614B (zh) | 2009-02-04 | 2010-02-03 | 光学信息记录介质、记录方法、再生方法以及记录再生装置 |
US13/131,819 US20110242957A1 (en) | 2009-02-04 | 2010-02-03 | Optical information recording medium, recording method, reproduction method, and recording/reproduction device |
JP2010549395A JP5450458B2 (ja) | 2009-02-04 | 2010-02-03 | 光学的情報記録媒体、記録方法、再生方法および記録再生装置 |
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- 2010-02-03 EP EP10738345.7A patent/EP2363856A4/en not_active Withdrawn
- 2010-02-03 WO PCT/JP2010/000630 patent/WO2010090004A1/ja active Application Filing
- 2010-02-03 US US13/131,819 patent/US20110242957A1/en not_active Abandoned
- 2010-02-03 JP JP2010549395A patent/JP5450458B2/ja active Active
- 2010-02-03 CN CN201080004775.6A patent/CN102282614B/zh active Active
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JPS5046317A (ja) | 1973-08-29 | 1975-04-25 | ||
WO1998009823A1 (fr) | 1996-09-09 | 1998-03-12 | Matsushita Electric Industrial Co., Ltd. | Support d'enregistrement d'informations optiques, procede de fabrication correspondant, et procede et dispositif d'enregistrement et de lecture d'informations optiques |
WO2007088682A1 (ja) * | 2006-01-31 | 2007-08-09 | Matsushita Electric Industrial Co., Ltd. | 情報記録媒体およびその製造方法、並びにその製造装置 |
JP2009020919A (ja) * | 2006-08-01 | 2009-01-29 | Ricoh Co Ltd | 追記型光記録媒体及びその記録方法 |
WO2008129826A1 (ja) * | 2007-03-30 | 2008-10-30 | Panasonic Corporation | 情報記録媒体及びその製造方法 |
JP2008305529A (ja) * | 2007-05-09 | 2008-12-18 | Victor Co Of Japan Ltd | 光情報記録媒体及び光情報記録媒体の製造方法 |
WO2009014064A1 (ja) * | 2007-07-24 | 2009-01-29 | Tdk Corporation | 光情報媒体 |
Non-Patent Citations (1)
Title |
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See also references of EP2363856A4 |
Also Published As
Publication number | Publication date |
---|---|
JP5450458B2 (ja) | 2014-03-26 |
EP2363856A4 (en) | 2014-11-26 |
CN102282614A (zh) | 2011-12-14 |
JPWO2010090004A1 (ja) | 2012-08-09 |
CN102282614B (zh) | 2015-08-12 |
EP2363856A1 (en) | 2011-09-07 |
US20110242957A1 (en) | 2011-10-06 |
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