WO2004038706A1 - 光学情報記録媒体及びその製造方法 - Google Patents
光学情報記録媒体及びその製造方法 Download PDFInfo
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- WO2004038706A1 WO2004038706A1 PCT/JP2003/013600 JP0313600W WO2004038706A1 WO 2004038706 A1 WO2004038706 A1 WO 2004038706A1 JP 0313600 W JP0313600 W JP 0313600W WO 2004038706 A1 WO2004038706 A1 WO 2004038706A1
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Classifications
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- 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
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
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- 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
- G11B7/005—Reproducing
- G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
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- 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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
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- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Definitions
- the present invention relates to an optical information recording medium for recording and reproducing a large amount of information using a laser beam, and a method for manufacturing the same.
- phase-change optical disk As an optical information recording medium capable of recording and reproducing signals using laser light, there is a phase-change optical disk. Of these, in a phase change optical disk capable of repeatedly recording and erasing signals, chalcogenide is generally used as a recording layer material.
- a single-sided two-layered disc has been proposed (see, for example, 200 0—36 130 publication).
- a format for recording a signal on an optical disk there are a system using a sector-one structure having a sector-address portion and a continuous recording system.
- An optical disc having a sector structure has a structure in which an area for managing information signals to be recorded and a data area for recording information signals by a user are separated.
- the main object of the present invention is to solve the above-mentioned problems by providing an optical information recording medium having a single-sided multilayer structure, that is, an optical information recording medium capable of reproducing information in a sector-one address portion without being affected by an adjacent information layer, and It is to provide a manufacturing method.
- n (n ⁇ 2) information layers capable of recording and reproducing signals by laser light irradiated through the substrate are formed on the substrate, An optical separation layer is formed between the layers, and the n information layers have a sector-one structure having a sector-address part and a data part for recording information signals divided in a circumferential direction.
- An optical information recording medium having a single-sided multilayer structure having: a sector-address portion of each information layer does not overlap a sector address portion of at least an adjacent information layer in the lamination direction of the information layer.
- the “information layer” refers to a layer including at least a recording layer that forms a recording mark by irradiation with a laser beam.
- the optical separation layer means that when an information signal is recorded on one of the n information layers or when the recorded signal is reproduced, the focus of the laser beam is focused on the other information layers. Separate each information layer at a sufficient distance so that they do not Refers to a layer provided for That is, the optical separation layer is a layer provided so that a laser beam does not simultaneously record two or more information layers or simultaneously reproduce signals from two or more information layers when recording and reproducing each information layer.
- the sector-address portion does not overlap at least the sector-address portion of the adjacent information layer in the information layer stacking direction
- the sector address part of each information layer does not overlap with the sector-one address part of any other information layer in the stacking direction of the information layer. That is, it is preferable that, in a section cut in the information layer laminating direction along one certain sector address portion, no sector address portion of any other information layer besides the sector address portion is located.
- This configuration eliminates the influence of the sector address portion of the distant information layer as well as the adjacent information layer, thereby reducing the distortion of the reproduced signal of the sector address portion.
- the present invention also provides a method in which laser light is irradiated onto a substrate through the substrate.
- a method for manufacturing an optical information recording medium having n (n ⁇ 2) information layers capable of recording and reproducing signals comprising: a sector address portion divided in a circumferential direction and a data portion for recording an information signal.
- Forming each information layer having a sector-one structure including: an optical separation layer located between the information layers; and a sector address portion in each information layer in a stacking direction of the information layer.
- a manufacturing method including positioning at least not to overlap a sector address portion of an adjacent information layer.
- the optical information recording medium provided by this manufacturing method is the optical information recording medium of the present invention.
- the manufacturing method of the present invention an optical information recording medium capable of reducing the distortion of the reproduced signal in the sector address portion can be manufactured by a simpler method than the conventional manufacturing method.
- the information layer having the sector-one structure is such that a recording layer or the like constituting the information layer is formed along the surface of the substrate or the optical separation layer having the unevenness corresponding to the sector-one structure. It is formed by this.
- Positioning may be performed in advance based on the number of information layers and the structure of one sector. Alternatively, the positioning may be performed on the spot, for example, by rotating the information layers to be stacked while observing the position of the sector-one address portion when the information layers are sequentially overlapped. Alternatively, the preliminary positioning may be performed first, and the position of the information layer or the like may be finely adjusted on the spot to complete the positioning.
- FIG. 1 is a schematic diagram showing a structure of an embodiment of an optical information recording medium having a single-sided, two-layer structure of the present invention.
- FIG. 2 is a schematic view showing each step in one embodiment of a method for producing an optical information recording medium having a single-sided, two-layer structure.
- FIG. 3 is a schematic view showing each step in another embodiment of the method for manufacturing an optical information recording medium having a single-sided, two-layer structure.
- FIG. 4 is a schematic diagram more specifically showing the structures of the first information layer and the second information layer of the optical information recording medium shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a configuration of an optical information recording medium (optical disc) according to an embodiment of the present invention.
- FIG. 1A is a cross-sectional view showing a cross section cut along a radius.
- this optical information recording medium includes a first information layer 2, a second information layer 4, a first information layer 2 and a second information layer 4 on a substrate 1. It is composed of an optical separation layer 3 and a protective substrate 5 located between the two.
- the recording and reproduction of the information signal is performed using a laser beam 7 irradiated from the substrate 1 side and collected by the objective lens 6.
- Recording and reproduction of the first information layer 2 are performed using the laser light beam 7 that has passed through the substrate 1.
- Recording / reproducing to / from the second information layer 4 is performed using the laser light beam 7 further transmitted through the first information layer 2.
- FIGS. 1 (b) and 1 (c) show the sector structures of the first information layer 2 and the second information layer 4, respectively.
- the first information layer 2 includes a data portion 8 for recording and reproducing an information signal on the surface and a sector address portion 9 for managing a recording data position.
- the data section 8 has a guide-groove or sample pit for tracking in a spiral shape
- the sector-to-address section 9 has an address pit row composed of a pattern corresponding to address information.
- the guide groove and the address pit of the information layer are obtained as a result of forming the information layer along irregularities formed on the surface of the substrate 1 or the optical separation layer 3.
- the substrate 1 or the optical separation layer 3 on which the corresponding unevenness is formed is formed. It is necessary to form or select the first information layer on the surface having the irregularities.
- the second information layer 4 has a data part 10 and a sector-one address part 11, like the first information layer 2, and has a pattern (that is, a sector-one). The arrangement (one sector) is the same as the first information layer 2.
- Two information layers having the same pattern of the sector-one structure have the same surface shape (that is, (An uneven pattern formed by pits and guide grooves).
- the sector structure of the second information layer 4 is provided by the convexity of the surface of the protection substrate 5 or the optical separation layer 3.
- the first information layer 2 and the second information layer 4 are completely displaced relative to each other in the circumferential direction as shown in FIGS. 1 (b) and 1 (c). Therefore, the relative positions in the circumferential direction of the sector-one address portions 9 and 11 are arranged so that they do not coincide (do not overlap) in any portion.
- both sectors have one address. It is necessary to stack two information layers via the optical separation layer 3 after positioning so that they are completely shifted.
- FIG. 2 shows a method for manufacturing an optical information recording medium having a single-sided, two-layer structure.
- the first film forming step shown in FIG. 2 (a) on the substrate 1 having four convex portions corresponding to the guide grooves of the sector one structure having the sector one address part and the data part divided in the circumferential direction.
- the first information layer 2 is formed.
- the second information layer 4 is formed on the second substrate 5.
- the second substrate 5 has projections and depressions corresponding to the sector-structured guide groove having the sector address portion and the data portion divided in the circumferential direction.
- the second substrate 5 becomes the protection substrate 5 in the optical information recording medium finally obtained.
- the first substrate 1 and the second substrate 5 are bonded so that the second information layer 4 and the first information layer 2 face each other. Therefore, as shown in FIG. 4, the concavities and convexities formed on the fifth substrate are complementary to the HQ protrusions formed on the first substrate 1. That is, in the optical information recording medium finally obtained, the concave portion forming the guide groove on the first substrate 1 has a relationship overlapping with the convex portion forming the guide groove on the second substrate 5, whereby Both the first information layer 2 and the second information layer 4 formed in the portion form a group plane G on the near side when viewed from the laser beam.
- the adhesive 101 is applied on the second information layer 4.
- a form using an ultraviolet-cured luster as an adhesive is shown.
- the application is performed by, for example, a spin coat method.
- the adhesive 101 is used to record the optical information In the recording medium, it becomes the optical separation layer 3.
- the first information layer 2 on the first substrate 1 and the second information layer 4 formed on the second protection substrate 5 are bonded with an adhesive 101 Facing each other, and overlapping.
- the superposition of the two information layers is determined in advance so that the sector address portion 9 of the first information layer 2 and the sector address portion 11 of the second information layer 4 do not overlap, and according to this positioning. carry out. More specifically, after the two information layers 1 and 4 face each other so as to satisfy the positional relationship where the sector-to-address portions 9 and 11 do not overlap, one of the two substrates 1 and 5 is horizontally placed. They may be overlaid by moving them.
- the superposition of the two information layers may be performed while checking the positions of the sector-one address portions 9 and 11 so that they do not overlap in the laminating direction. That is, the positioning of the sector-one address portions 9 and 11 may be performed on the spot when the two information layers 2 and 4 are overlapped. The positioning performed in that case is performed, for example, by rotating one or both of the first substrate 1 and the second substrate 5.
- the sector-to-address portions 9 and 11 may be configured to slightly rotate one or both of the first substrate 1 and the second substrate 5 from a state in which both are substantially aligned in the information layer laminating direction. As a result, they are completely displaced from each other.
- the fact that the sector-to-address portions 9 and 11 are shifted from each other means, for example, that the optical information recording medium is irradiated with a laser beam while the two information layers 2 and 4 are superimposed. It can be confirmed by observing the beam from the incident side. Since light is reflected differently between the data section and the sector address section, it is easy to visually observe the existence of the sector-address section.
- the sum of the number of sector address portions visually observed becomes the sum of the number of sector address portions formed on the two information layers 2 and 4. For example, it can be confirmed that the sector address portions 9 and 11 do not match in the stacking direction.
- rotation and Z or pressure are further performed as necessary so that the thickness of the adhesive 101 between the substrates becomes uniform.
- a hardening process shown in FIG. The curing process is used in the bonding process This is performed after the two information layers 2 and 4 are overlapped at a position where the position of the sector 1 address portion 9 of the substrate 1 and the position of the sector 1 address portion 11 of the substrate 2 are relatively completely shifted in the circumferential direction.
- the adhesive 101 is cured by irradiating light from an ultraviolet lamp from the first substrate 1 side.
- an optical information recording medium having a single-sided, two-layer structure in which a complete displacement of one sector in the circumferential direction occurs between two information layers.
- Another method of superposing the two information layers formed on the substrate is to use a resin circular sheet.
- This method is a method for producing an optical information recording medium having a single-sided, two-layer structure using a resin circular sheet to separate the first information layer and the second information layer.
- the two information layers are arranged on both sides of the resin sheet so that the sector address portions of the first information layer and the second information layer are completely displaced, and the substrate and the protection substrate are placed on the resin sheet. to paste together.
- the two substrates on which the information layer is formed and the resin sheet are bonded together using an adhesive or an ultraviolet curable resin. More specifically, after bonding one of the substrates to the resin sheet, and then positioning according to the result of the positioning performed in advance, and Z or in place, and bonding the other substrate to the resin sheet, Overlay the two information layers.
- the optical information recording medium having a single-sided, two-layer structure created as described above is said to eliminate or reduce the distortion of the reproduced signal due to the influence of the sector address portion of the adjacent information layer when reproducing the sector address portion 9. This has the advantage that the signal recorded on this medium has good reproduction characteristics, with no or reduced detection errors.
- the sector-one structure of the second information layer is formed by providing irregularities with a stamper on the surface of the optical separation layer, and forming the second information layer on the surface provided with the irregularities.
- FIG. 3 shows a method for manufacturing an optical information recording medium having a single-sided, two-layer structure, including a step of forming an optical separation layer by a 2P method.
- a first information layer 2 is formed on a substrate 1 having a guide groove having a sector-one structure including a sector-address part and a data part.
- This step is the same as the step shown in FIG.
- the step shown in FIG. 3 (b) is a step of applying a transparent resin 112 serving as an optical separation layer 3 on a stamper 111 having an uneven surface.
- the depressions and projections on the surface of the stamper 111 are formed according to the structure of the sector to be formed on the second information layer.
- the transparent resin layer 112 is, for example, an ultraviolet curable resin.
- the first substrate 1 on which the first information layer 2 is formed is bonded to the resin layer 112 with the first information layer 2 facing the stamper 111. It is a process. This step may be determined in advance so that the sector address portions of the two information layers do not overlap, and may be performed according to this positioning. In this method, the position of the sector address portion of the second information layer is determined based on the position of the ⁇ convex of the stamper. More specifically, the bonding process is performed after the stamper 11 and the first substrate 1 on which the first information layer 2 is formed face each other so as to satisfy a positional relationship where the sector address portions do not overlap. You may implement by moving one force horizontally.
- the positioning may be performed on the spot by rotating the stampers 111 and Z or the first substrate 1. Further, in this step, force application and / or rotation are performed as necessary so that the distance between the first substrate 1 and the stamper 11 1 is constant. Next, ultraviolet rays are irradiated from the side of the first substrate 1 to harden the resin layer 112.
- the step shown in FIG. 3D is a step of separating the first substrate 1 from the stamper 111 at the boundary between the stamper 111 and the resin layer 112. In this way, the optical separation layer 3 having irregularities on the surface is formed on the surface of the first information layer 2.
- the step shown in FIG. 3E is a step of forming the second information layer 4 on the surface of the optical separation layer 3.
- the protection substrate 5 is laminated on the second information layer 4.
- a second information layer 4 is first formed on a second substrate 5 to be a protection substrate 5, and an optical separation layer 3 is formed on the second information layer 4.
- the first substrate 1 can be formed as a thin film on the first information layer 2 by, for example, a spin coating method.
- the optical information recording medium in which the thickness of the first substrate 1 is reduced is suitable, for example, for recording and reproducing information with a short-wavelength laser light beam.
- each information layer has a focused laser beam.
- the optical property changes by absorbing the beam
- the recording layer includes a thin film whose force-changed state can be identified by the laser beam 7.
- the information signal recorded on the recording layer of each information layer is reproduced by irradiating the first information layer 2 and the second information layer 4 with the laser beam light 7 and detecting a change in the intensity of the reflected light.
- the first information layer 2 has a transmittance of 30 to 80% with respect to the wavelength of the laser beam light 7 used for recording so that light of sufficient intensity reaches the second information layer 4. It is desirable to have
- the recording of information on the second information layer 4 and the reproduction of the recorded information are performed by the laser beam 7 transmitted through the first information layer 2. Therefore, the recording layer constituting the second information layer 4 has a high light absorption for the wavelength of the laser beam used for recording and has a reflectance for the wavelength of the laser beam 7 used for reproduction. High is desirable.
- FIG. 4 shows the structures of the first information layer 2 and the second information layer 4 of the optical information recording medium of the present invention in more detail.
- the first information layer 2 includes a first recording layer 23 and two protective layers 21 and 25 for protecting both sides thereof.
- the second information layer includes a second recording layer 43, two protective layers 41 and 45 for protecting both surfaces thereof, and a reflective layer 47.
- the two information layers 2 and 4 are separated by an optical separation layer 3.
- both of the information layers have guide grooves having a land group structure.
- the surface closer to the laser beam 7 is indicated by “G” as a group surface.
- the substrate 1 is made of a material that is transparent to the wavelength of the laser light to be irradiated. Such materials are resins such as polycarbonate and PMMA, and glass materials.
- address pits constituting the sector 1 address portion 9 are formed, and irregularities corresponding to the guide grooves as shown are formed as necessary.
- the guide groove is a continuous groove for guiding the laser light beam 7, and is also called a track. Substrates with irregularities on the surface are, for example, compact discs (CD) and It is formed by applying the mastering process used for digital versatile discs (DVD).
- the thickness of the substrate 1 is usually about 0.5 to 0.7 mm.
- the substrate 1 is a thin substrate formed by a spin coating method or the like. It may be hot.
- the protective substrate 5 is preferably formed of the same material as the substrate 1 and preferably has the same thickness as the substrate 1 in order to suppress the warpage of the entire optical information recording medium. However, the substrate 5 does not necessarily need to be transparent to the wavelength of the laser light to be irradiated.
- the substrate 5 is also formed by applying a mastering step similarly to the substrate 1, and may be formed by a spin coating method when the optical separation layer is formed by the 2P method.
- the material constituting the protective layers 21, 25, 41 and 45 is physically and chemically stable, that is, the material constituting the first recording layer 23 and the second recording layer 43. It is preferable that the material has a melting point and a softening temperature higher than the melting point of the recording material and does not form a solid solution with the recording layer material. Further, the protective layer is preferably transparent to the wavelength of the laser light.
- the material constituting the protective layer for example, A1 2 0 3, S ⁇ O x, Ta 2 0 Mo0 3, W0 3, Z R_ ⁇ 2, Z n S, A1N X , BN, S i N x, T i N, ZrN, a P b F 2, and the material is selected from dielectric MgF 2 or the like or a combination seen these appropriate set.
- the protective layer is formed of a dielectric
- the protective layer is also called a dielectric layer.
- the protective layer does not necessarily need to be a dielectric material or a transparent material, and may be formed of, for example, ZnTe, which has a light absorbing property with respect to visible light and infrared light.
- At least one of the four protective layers 21, 25, 41, and 45 shown in the figure may be formed of a different material from the other protective layers.
- all four protective layers may be formed of different materials. It may be formed. In that case, there is an advantage that the degree of freedom in thermal and optical disk design is increased.
- all four protective layers may be formed of the same material.
- the protective layer is formed by an electron beam evaporation method, a sputtering method, an ion plating method, a CVD method, a laser sputtering method, or the like.
- each protective layer is appropriately selected according to the wavelength of laser light used for recording and reproduction. Usually, the thickness of each protective layer is in the range of 20 to 200 nm.
- the protective layers above and below one recording layer do not need to be the same thickness; one is a thin layer and the other is a thin layer. It may be a thick layer.
- the first recording layer 23 and the second recording layer 43 are layers in which a recording mark is formed by causing a phase change by irradiation with a laser beam. If the phase change is reversible, erasing and rewriting can be performed. Phase change generally occurs between a crystalline phase and an amorphous phase. Phase changes can occur between crystalline phases.
- the phase change material constituting the recording layer is, for example, a material mainly containing Te, In, Se, or the like.
- phase change materials Te-Sb-Ge, Te-Ge, Te-Ge-Sn, Te_Ge-Sn-Au, Sb-Se, Sb-Te, Sb-Se -Te, In-Te, In-Se, InSeTl, InSb, In_Sb-Se, and In-Se-Te.
- a material having a good recording / erasing repetition characteristic and a material of the material were examined by an experiment. As a result, it was found that a structure mainly composed of a three-element system of Ge, Sb, and Te was preferable.
- each recording layer is, for example, about 10 to 15 nm.
- the recording layer is formed by an electron beam evaporation method, a sputtering method, an ion plating method, a CVD method, a laser sputtering method, or the like.
- the first recording layer 23 and the second recording layer 43 may be formed of the same material or may be formed of different materials. Further, the two recording layers may have different thicknesses from each other. In any case, the material and / or thickness of the first recording layer 23 is appropriately selected so that the entire first information layer 2 has the above-described transmittance.
- a recording layer made of a material that changes phase between a crystalline phase and an amorphous phase is usually formed in an amorphous state, and is subjected to an initialization step as necessary.
- the initialization step is a step of heating the amorphous recording layer to a temperature higher than the crystallization temperature to crystallize the recording layer.
- the optical separation layer 3 is an intermediate layer disposed between the first information layer 2 and the second information layer 4.
- the function of the optical separation layer is as described above.
- the thickness of the optical separation layer 3 is usually 10 ⁇ m or more and 100 ⁇ m or less, and preferably 30 ⁇ m or more and 60 ⁇ m or less.
- the optical separation layer 3 records a signal on the second information layer 4 and is formed of a material that is transparent to the wavelength of a laser beam irradiated when reproducing the recorded signal. Second information layer 4 This is to secure a sufficient amount of light.
- the optical separation layer 3 is formed of, for example, an epoxy-based ultraviolet curing resin. When the optical separation layer 3 is formed by bonding a resin sheet, a double-sided tape for bonding an optical disk (for example, an adhesive sheet DA-8320 from Nitto Denko Corporation) or the like can be used as the resin sheet. .
- the reflection layer 47 is made of a metal element selected from Au, Al, Ni, Fe, Cr and the like, or an alloy thereof.
- the reflection layer 47 is preferably provided because it functions to enhance the light absorption efficiency of the second recording layer 43.
- the thickness of the reflective layer 47 is usually 50 to 180 nm.
- the reflection layer 47 is formed by an electron beam evaporation method, a sputtering method, an ion plating method, a CVD method, a laser sputtering method, or the like.
- the reflective layer 47 is formed on the surface of the substrate serving as the protective substrate 5 when an optical information recording medium is manufactured by a method of bonding two information layers formed on the substrate. In that case, a protective layer 45, a recording layer 43, and a protective layer 41 constituting the second information layer are formed in this order on the surface of the reflective layer. As shown in FIG. 3, when the optical separation layer 3 is formed by the 2P method, the reflection layer 47 is formed on the protection layer 45.
- the optical information recording medium may further include another layer as necessary.
- an interface layer may be formed between each recording layer and each protective layer.
- the interface layer is provided to prevent mutual diffusion of elements between the protective layer and the recording layer.
- the interface layer is, for example, a nitride or a carbide, for example, a material represented by the general formula X-N or X-O-N, wherein X is preferably Ge, Cr, Si, Al And at least one element selected from Te.
- a reflective layer may be provided in the first information layer.
- the reflective layer is formed by appropriately selecting a material and a thickness so that the entire first information layer has the above-described transmittance.
- the optical information recording medium of the present invention having three or more information layers is manufactured, for example, by repeating the step of forming an optical separation layer using the above-described 2P method and the step of forming an information layer on the surface thereof. Is done.
- the substrate on which the information layer is formed and the Z or stamper are appropriately arranged so that the sector address portion of each information layer does not overlap with the sector one address portion of the adjacent information layer, and each optical separation layer is formed. It must be formed on the surface of the information layer.
- the optical information recording medium of the present invention can be formed, for example, by appropriately selecting the configuration of each information layer, the thickness of the optical separation layer, the thickness of the substrate, etc. It is configured as a medium for recording and reproducing with a beam. Alternatively, the optical information recording medium of the present invention can be configured as a medium for recording and reproducing with a laser light beam in a blue-violet region having a wavelength of about 405 nm. It should be noted that the present invention is not limited by the wavelength of the laser light beam used for recording / reproducing, and can be applied to any single-sided multilayered optical information recording medium having a sector-one structure. Industrial potential
- an optical information recording medium having a single-sided multilayer structure capable of stably reproducing a signal in a sector-address portion can be obtained. Therefore, the present invention provides a large-capacity optical disc for recording moving images and audio for a long time. It is preferably applied to
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US10/532,061 US20060062131A1 (en) | 2002-10-28 | 2003-10-24 | Optical information recording medium and production method of the same |
JP2004546471A JPWO2004038706A1 (ja) | 2002-10-28 | 2003-10-24 | 光学情報記録媒体及びその製造方法 |
AU2003275641A AU2003275641A1 (en) | 2002-10-28 | 2003-10-24 | Optical information recording medium and its producing process |
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JP (1) | JPWO2004038706A1 (ja) |
CN (1) | CN1319054C (ja) |
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US8675464B2 (en) * | 2005-11-03 | 2014-03-18 | Cinram Group, Inc. | Dual sided optical storage media and method for making same |
US7684309B2 (en) | 2005-11-03 | 2010-03-23 | Cinram International Inc. | Multi-purpose high-density optical disc |
US8739299B1 (en) | 2009-12-24 | 2014-05-27 | Cinram Group, Inc. | Content unlocking |
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JPH0258732A (ja) * | 1988-08-24 | 1990-02-27 | Nec Corp | 記録再生方式 |
JPH03219440A (ja) * | 1989-10-30 | 1991-09-26 | Matsushita Electric Ind Co Ltd | 多層記録光ディスク |
JPH09270149A (ja) * | 1996-04-01 | 1997-10-14 | Funai Denki Kenkyusho:Kk | 2層式光ディスクおよび2層式光ディスクの製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MY139798A (en) * | 1991-06-04 | 2009-10-30 | Mitsubishi Electric Corp | Multiple data surface data storage system and method |
KR0165297B1 (ko) * | 1994-11-09 | 1999-03-20 | 김광호 | 다층 정보디스크 및 그 제조방법 |
EP1345215A3 (en) * | 1996-07-10 | 2004-09-15 | Hitachi, Ltd. | Optical disc apparatus accessing method and system therefor |
JP3552143B2 (ja) * | 1997-07-15 | 2004-08-11 | パイオニア株式会社 | 多層ディスク用キャリッジ制御装置 |
TW554341B (en) * | 2000-12-15 | 2003-09-21 | Koninkl Philips Electronics Nv | Optical information medium and its use |
-
2003
- 2003-10-24 AU AU2003275641A patent/AU2003275641A1/en not_active Abandoned
- 2003-10-24 US US10/532,061 patent/US20060062131A1/en not_active Abandoned
- 2003-10-24 CN CNB2003801023161A patent/CN1319054C/zh not_active Expired - Fee Related
- 2003-10-24 JP JP2004546471A patent/JPWO2004038706A1/ja active Pending
- 2003-10-24 WO PCT/JP2003/013600 patent/WO2004038706A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0258732A (ja) * | 1988-08-24 | 1990-02-27 | Nec Corp | 記録再生方式 |
JPH03219440A (ja) * | 1989-10-30 | 1991-09-26 | Matsushita Electric Ind Co Ltd | 多層記録光ディスク |
JPH09270149A (ja) * | 1996-04-01 | 1997-10-14 | Funai Denki Kenkyusho:Kk | 2層式光ディスクおよび2層式光ディスクの製造方法 |
Also Published As
Publication number | Publication date |
---|---|
AU2003275641A1 (en) | 2004-05-13 |
CN1319054C (zh) | 2007-05-30 |
CN1708792A (zh) | 2005-12-14 |
US20060062131A1 (en) | 2006-03-23 |
JPWO2004038706A1 (ja) | 2006-02-23 |
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