WO2003088233A1 - Support d'enregistrement optique - Google Patents
Support d'enregistrement optique Download PDFInfo
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- WO2003088233A1 WO2003088233A1 PCT/JP2003/004354 JP0304354W WO03088233A1 WO 2003088233 A1 WO2003088233 A1 WO 2003088233A1 JP 0304354 W JP0304354 W JP 0304354W WO 03088233 A1 WO03088233 A1 WO 03088233A1
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- Prior art keywords
- recording
- layer
- recording layer
- recording medium
- optical
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 60
- 238000002834 transmittance Methods 0.000 claims abstract description 37
- 230000001965 increasing effect Effects 0.000 claims abstract description 15
- 239000007769 metal material Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 11
- 239000000758 substrate Substances 0.000 description 7
- 239000000956 alloy Substances 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910005900 GeTe Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 150000001786 chalcogen compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
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
-
- 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
- G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
-
- 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
- G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording 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
- G11B2007/24306—Metals or metalloids transition metal elements of groups 3-10
-
- 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
- G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25706—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
-
- 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
- G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25715—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing oxygen
-
- 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
Definitions
- the present invention relates to an optical recording medium having two or more recording layers.
- an optical recording medium having a plurality of recording layers and recording and / or reproducing information on each of the plurality of recording layers has been known.
- an optical recording medium 101 having such a structure includes a first recording layer 103 and an intermediate layer 104 on one main surface of a substrate 102.
- the second recording layer 105 and the power layer 106 are laminated in this order.
- recording and / or reproduction is performed by, for example, laser light being incident as recording light or reproduction light from the opposite side of the substrate 102, that is, from the cover layer 106 side. .
- the optical recording medium 101 shown in FIG. 10 is a phase-change type optical recording medium
- the first recording layer 103 and the second recording layer 105 become crystalline due to the recording light.
- an amorphous state are reversibly changed, and a phase-change recording film capable of detecting these two states based on a difference in reflectance of reproduction light.
- a metal material film made of an A1-based alloy material or an Ag-based alloy material is formed adjacent to the phase-change recording film. I have.
- This metal material film has the function of enhancing the signal recorded on the phase change recording film during reproduction, and ⁇ ⁇ It has a heat sink function to rapidly cool the phase change recording film during recording.
- the second recording layer 105 arranged on the side where the laser light is incident has sufficient absorption or absorption during recording and reproduction of the second recording layer 105.
- phase change recording film and the metal material film made of an A 1 -based alloy or an Ag-based alloy as described above absorb laser light, the transmittance of the second recording layer 105 is particularly high. Has become an important issue.
- One of the techniques for increasing the transmittance of the second recording layer 105 is to reduce the thickness of the metal material film forming the second recording layer 105.
- the thickness of the metal material film is smaller than the current thickness, the reflectivity of the second recording layer 105 may decrease, or the heat capacity as a heat sink may decrease. Therefore, it is difficult to adopt a method of reducing the thickness of the metal material film.
- Another method for increasing the transmittance of the second recording layer 105 is to reduce the thickness of a recording film such as a phase-change recording film constituting the second recording layer 105.
- reducing the thickness of the recording film decreases the number of crystal nuclei in the recording film, which may cause a decrease in the transfer rate during recording.
- An object of the present invention is to provide an optical recording medium capable of transmitting recording light or reproduction light for performing recording / reproduction of a first recording layer at a high transmittance without reducing the film thickness. Disclosure of the invention
- an optical recording medium is an optical recording medium having two or more recording layers, and a first recording layer and a first recording layer via an intermediate layer.
- a second recording layer disposed on a side where recording light or reproduction light is incident rather than a layer, and an incident angle of light between the intermediate layer and the second recording layer increases.
- a dielectric layer for increasing the transmittance of light transmitted through the second recording layer.
- the second recording layer is arranged between the second recording layer and the intermediate layer disposed on the side where recording light or reproduction light is incident, as the incident angle of light increases. Since it has a dielectric layer that increases the transmittance of light transmitted through the layer, it has a relatively large incident angle with respect to the second recording layer while maintaining the transmittance of light incident at an incident angle of 0 °.
- the transmittance of incident light can be increased. That is, it is not necessary to reduce the thickness of the second recording layer in order to increase the transmittance of recording light or reproduction light for performing recording or reproduction on the first recording layer in the second recording layer.
- FIG. 1 is a cross-sectional view of a main part when a light-collecting spot is located on a first recording layer or a second recording layer in an optical recording medium to which the present invention is applied.
- FIG. 2 is a characteristic diagram showing the dependence of transmittance on incident angle (numerical aperture) when the second recording layer of the embodiment is in an amorphous state.
- FIG. 3 is a characteristic diagram showing the dependence of transmittance on the incident angle (numerical aperture) when the second recording layer of the example is in a crystalline state.
- FIG. 4 is a characteristic diagram showing the dependence of the transmittance on the incident angle (numerical aperture) when the second recording layer of the comparative example is in an amorphous state.
- FIG. 5 is a characteristic diagram showing the dependence of transmittance on the incident angle (numerical aperture) when the second recording layer of the comparative example is in a crystalline state.
- FIG. 6 is a characteristic diagram showing a simulation result of a frequency characteristic of a reproduced signal for the second recording layer of the example.
- FIG. 7 is a characteristic diagram showing a simulation result of a frequency characteristic of a reproduction signal for the first recording layer of the example.
- FIG. 8 is a characteristic diagram showing a simulation result of a frequency characteristic of a reproduction signal for the second recording layer of the comparative example.
- FIG. 9 is a characteristic diagram showing a simulation result of a frequency characteristic of a reproduced signal for the first recording layer of the comparative example.
- FIG. 10 is a sectional view of a main part of a conventional optical recording medium. BEST MODE FOR CARRYING OUT THE INVENTION
- an optical recording medium 1 to which the present invention is applied includes a substrate
- a first recording layer 3 On one main surface of 2, a first recording layer 3, an intermediate layer 4, and a second recording layer
- this optical recording medium 1 recording is performed by, for example, laser light being incident as recording light or reproduction light from the opposite side of the substrate 2, that is, the cover layer 6. And / or playback is performed.
- the substrate 2 conventionally known materials used for ordinary optical recording media can be used, and for example, plastics such as polycarbonate and acrylic, glass and the like are preferable.
- the first recording layer 3 and the second recording layer 5 are formed of a metal material film in order from the substrate 2 side. , A dielectric film, a phase change recording film as a recording film, and a dielectric film in this order.
- phase-change recording film contains a phase-change recording material in which the crystalline state and the amorphous state are reversibly changed by the recording light, and these two states can be detected by the difference in the reflectance of the reproduction light.
- Specific phase change recording materials include, in addition to the chalcogen compound G e S b T e,
- the metal material film is made of a metal material such as an A1-based alloy material or an Ag-based alloy material, and has the function of enhancing signals recorded on the phase change recording film during reproduction, and the function of recording phase change during recording. It has a heat sink function to rapidly cool the film.
- a pair of dielectric film having the first recording layer 3 and the second recording layer 5 each are made of, for example, Z n S- S i ⁇ 2 such as a transparent dielectric material such.
- Intermediate layer 4 is preferably, for example, N b 2 ⁇ 5 like that consists of a material having a high refractive Oriritsu than the lens numerical aperture NA of the recording and reproducing optical system.
- the dielectric layer 7 is composed of a first dielectric layer 8 having a refractive index nl lower than the refractive index ni of the intermediate layer 4 and a first dielectric layer 8. It has a laminated structure with a second dielectric layer 9 having a refractive index n 2 higher than the refractive index n 1, of which the second dielectric layer 9 is disposed on the second recording layer 5 side .
- the laser beam A focused on the second recording layer 5 forms a focal point at the focused spot, so that there is almost no incident angle within the focal depth. I'm sorry. That is, when the focus position of the laser beam A is on the second recording layer 5, most of the laser beam A near the second recording layer 5 is incident at an angle perpendicular to the second recording layer 5. Consists of components. On the other hand, when the first recording layer 3 has the focal position of the laser beam B, the laser beam B having a large incident angle component with respect to the second recording layer 5 exists.
- the laser light that is perpendicularly incident on the second recording layer 5 near the laser light incident surface is provided.
- the transmittance of the laser beam incident at a relatively large incident angle is increased with little effect on the transmittance of the laser beam.
- the signal strength of the first recording layer 3 can be increased without reducing the signal strength during recording or reproduction of the second recording layer 5. Therefore, without reducing the thickness of the recording material layer, metal material layer, etc. in the second recording layer 5, the second recording layer 5 is exposed to the laser beam during recording and reproduction of the first recording layer 3.
- the transmittance the amount of laser light reaching the first recording layer 3 can be increased.
- the recording power of the laser light during the recording of the first recording layer 3 can be reduced as compared with the related art. it can.
- each of the first dielectric layer 8 and the second dielectric layer 9 constituting the above-described dielectric layer 7 may be at least such that a continuous film can be formed.
- the thickness of each of the first dielectric layer 8 and the second dielectric layer 9 should be 1 in order to suppress interference by these dielectric layers and not to affect the distribution of the amount of light transmitted through the dielectric layers. It is preferably at most 0 O nm.
- the method for forming these dielectric layers 7 is not particularly limited, and for example, a sputtering method or the like is used.
- the present invention is not limited to the above description, and can be appropriately modified without departing from the gist of the present invention.
- the first dielectric layer and the second dielectric layer are disposed as a dielectric layer disposed between the recording layer and the intermediate layer disposed on the surface on which the laser beam is incident.
- a first dielectric layer having a refractive index n 1 lower than the refractive index ni of the intermediate layer as described above is provided between the recording layer and the intermediate layer disposed on the surface side on which the laser beam is incident.
- a second dielectric layer having a refractive index n 2 higher than the refractive index n 1 and the second dielectric layer is disposed on the second recording layer side.
- Other layers may be included as well.
- the optical recording medium to which the present invention is applied is not limited to the example having the two recording layers described above, and may have three or more recording layers.
- the optical recording medium has three or more recording layers, it is sufficient that the above-described dielectric layer is provided between at least one recording layer and the intermediate layer.
- the present invention is not limited to this, and a rewritable optical recording medium such as a magneto-optical recording medium, Or a read-only optical recording medium.
- the first recording layer and the second recording layer include the above-described reflective film, a dielectric layer made of, for example, SiN formed thereon, a first magnetic layer and for example T b F e C o layer due to the signal recording layer made of the second magnetic layer by e C o layer, for example, S i O 2 layer and S i N layer formed thereon And a structure having a light-transmitting dielectric layer.
- the shape of the optical recording medium it is needless to say that various known shapes such as a disk shape and a tape shape can be adopted.
- a phase-change optical recording medium having a structure shown in Table 1 below was manufactured.
- a phase-change optical recording medium having the structure shown in Table 2 below was manufactured.
- the optical recording medium of the comparative example was a dielectric layer between the intermediate layer and the second recording layer. This is different from the optical recording medium of the embodiment in that no is formed.
- Each layer constituting the examples and the comparative examples was formed by a sputtering method.
- the thickness of the air layer between the objective lens and the optical recording medium at the time of recording and reproduction on these optical recording media is set to 50 nm.
- the objective lens of the recording / reproducing optical system has an index of refraction of 1.83. A lens was used.
- the phase change recording material in the phase change recording film is abbreviated as PC (Phase Change).
- the phase change recording material used here is a Ge 2 Sb 2 Te 5 system phase change material. table 1
- the second embodiment The results of the dependence of the transmittance of the recording layer on the incident angle (numerical aperture) are shown in FIGS. 2 and 3. 4 and 5 show the results of the dependency of the transmittance of the second recording layer of the comparative example on the incident angle (the number of apertures).
- the transmittance of P-polarized light is represented by ⁇
- the transmittance of S-polarized light is represented by X. 2 to 5
- the vertical axis represents the transmittance of the second recording layer
- the horizontal axis represents the lens numerical aperture NA.
- FIG. 2 is a graph showing the dependence of transmittance on the incident angle (numerical aperture) when the second recording layer of the embodiment is in an amorphous state.
- FIG. 3 is a diagram showing the dependence of the transmittance on the incident angle (numerical aperture) when the second recording layer of the example is in a crystalline state.
- FIG. 4 is a diagram showing the dependence of the transmittance on the incident angle (numerical aperture) when the second recording layer of the comparative example is in an amorphous state.
- FIG. 5 is a diagram showing the dependence of the transmittance on the incident angle (numerical aperture) when the second recording layer of the comparative example is in a crystalline state.
- the transmittance of the second recording layer in the embodiment and the comparative example for the laser beam having an incident angle of 0 °, that is, the incident angle perpendicular to the substrate, is does not change.
- the transmittance of the second recording layer of the example shows a higher result than the transmittance of the second recording layer of the comparative example. Similar results were obtained in either the amorphous state or the crystalline state, and in both the S-polarized light and the P-polarized light.
- FIGS. 6 to 9 show the simulation results of the frequency characteristics (MTF) of the reproduced signal for the above-described embodiment and the comparative example.
- FIG. 6 shows the result of the second recording layer of the example.
- FIG. 7 shows the result of the first recording layer of the example.
- FIG. 8 shows the result of the second recording layer of the comparative example.
- FIG. 9 shows the result of the first recording layer of the comparative example. 6 to 9, the vertical axis represents the degree of modulation, and the horizontal axis represents the reciprocal of the mark length. In Figs. 6 to 9, gap is the thickness of the air layer.
- the refractive index n 1 is lower than the refractive index ni of the intermediate layer between the intermediate layer and the second recording layer located on the laser light incident surface side.
- a dielectric layer having a laminated structure of a first dielectric layer and a second dielectric layer having a refractive index n 2 higher than the refractive index n 1 of the first dielectric layer is provided. It was found that by optimizing the thickness and the refractive index of the first recording layer, the recording / reproducing characteristics of the first recording layer could be improved without substantially affecting the recording / reproducing characteristics of the second recording layer.
- the present invention is not limited to the embodiments described above. That is, in the above-described embodiment, an optical recording medium having a configuration in which the transmittance of laser light that is perpendicularly incident on the second recording layer is not changed at all is taken as an example.
- the present invention is not limited to this.
- the present invention adjusts the signal intensity of the second recording layer by adjusting the transmittance of laser light perpendicularly incident on the second recording layer by adding a dielectric layer.
- the signal intensity of the first recording layer can also be increased by increasing the transmittance of laser light incident on the second recording layer at a large incident angle.
- the refractive index ni of the intermediate layer is equal to the refractive index n 2 of the second dielectric layer
- the present invention is not limited to this.
- the refractive index ni of the intermediate layer, the refractive index nl of the first dielectric layer, and the refractive index n2 of the second dielectric layer are ni> nl, and are represented by n2> nl. If the relationship is satisfied, the effects of the present invention can be obtained.
- the optical recording medium of the present invention is applied to so-called two-field recording in which the lens numerical aperture NA of the recording / reproducing optical system is 1 or more is exemplified.
- the optical recording medium of the present invention can of course be used in combination with a normal recording / reproducing optical system in which the lens numerical aperture N A of the recording / reproducing optical system is less than 1.
- the optical recording medium according to the present invention does not reduce the thickness of the second recording layer, but does not reduce the thickness of the second recording layer. Since the light is transmitted through the second recording layer with a high transmittance, it is possible to increase the amount of recording light or reproduction light for performing recording or reproduction on the first recording layer. Therefore, according to the present invention, it is possible to provide an optical recording medium in which the recording and reproducing characteristics of the first recording layer are improved without impairing the recording and reproducing characteristics of the second recording layer. .
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- Inorganic Chemistry (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/480,368 US7420908B2 (en) | 2002-04-16 | 2003-04-04 | Optical recording medium |
EP03746428A EP1496508A4 (en) | 2002-04-16 | 2003-04-04 | OPTICAL RECORDING MEDIUM |
KR10-2003-7016412A KR20040095607A (ko) | 2002-04-16 | 2003-04-04 | 광 기록 매체 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002112884A JP2003317314A (ja) | 2002-04-16 | 2002-04-16 | 光記録媒体 |
JP2002-112884 | 2002-04-16 |
Publications (1)
Publication Number | Publication Date |
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WO2003088233A1 true WO2003088233A1 (fr) | 2003-10-23 |
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PCT/JP2003/004354 WO2003088233A1 (fr) | 2002-04-16 | 2003-04-04 | Support d'enregistrement optique |
Country Status (6)
Country | Link |
---|---|
US (1) | US7420908B2 (ja) |
EP (1) | EP1496508A4 (ja) |
JP (1) | JP2003317314A (ja) |
KR (1) | KR20040095607A (ja) |
TW (1) | TW200405319A (ja) |
WO (1) | WO2003088233A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7645499B2 (en) * | 2002-10-10 | 2010-01-12 | Panasonic Corporation | Optical information recording medium and manufacturing method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007020541A2 (en) * | 2005-08-12 | 2007-02-22 | Koninklijke Philips Electronics N.V. | Optical recording medium |
JP4415271B2 (ja) | 2005-08-30 | 2010-02-17 | 日本電気株式会社 | 光記録媒体 |
WO2009150855A1 (ja) * | 2008-06-13 | 2009-12-17 | パナソニック株式会社 | 情報記録媒体とそれを用いた記録再生方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11500253A (ja) * | 1995-10-13 | 1999-01-06 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | 二重情報層を有する光記録媒体 |
EP1052631A2 (en) | 1999-05-12 | 2000-11-15 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, method for producing the same, and method and apparatus for recording/reproducing information thereon |
JP2001028148A (ja) * | 1999-05-12 | 2001-01-30 | Matsushita Electric Ind Co Ltd | 光学的情報記録媒体とその製造方法、記録再生方法及び記録再生装置 |
JP2002260275A (ja) * | 2001-03-02 | 2002-09-13 | Sharp Corp | 光情報記録媒体 |
JP2003173573A (ja) * | 2001-12-07 | 2003-06-20 | Toshiba Corp | 光学情報記録媒体及び光ディスクドライブ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US5424106A (en) * | 1992-04-17 | 1995-06-13 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium and method of designing its structure |
JP3039487B2 (ja) * | 1997-11-20 | 2000-05-08 | 日本電気株式会社 | 情報記録媒体 |
TW583660B (en) * | 2001-01-25 | 2004-04-11 | Koninkl Philips Electronics Nv | Optical information medium and a method of manufacturing the medium |
US6764736B2 (en) * | 2001-07-12 | 2004-07-20 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium and recording method using the same |
US6858278B2 (en) * | 2001-12-18 | 2005-02-22 | Matsushita Electric Industrial Co., Ltd. | Information recording medium and method for producing the same |
-
2002
- 2002-04-16 JP JP2002112884A patent/JP2003317314A/ja active Pending
-
2003
- 2003-04-04 US US10/480,368 patent/US7420908B2/en not_active Expired - Fee Related
- 2003-04-04 KR KR10-2003-7016412A patent/KR20040095607A/ko active Search and Examination
- 2003-04-04 EP EP03746428A patent/EP1496508A4/en not_active Withdrawn
- 2003-04-04 WO PCT/JP2003/004354 patent/WO2003088233A1/ja active Application Filing
- 2003-04-15 TW TW092108671A patent/TW200405319A/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11500253A (ja) * | 1995-10-13 | 1999-01-06 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | 二重情報層を有する光記録媒体 |
EP1052631A2 (en) | 1999-05-12 | 2000-11-15 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, method for producing the same, and method and apparatus for recording/reproducing information thereon |
JP2001028148A (ja) * | 1999-05-12 | 2001-01-30 | Matsushita Electric Ind Co Ltd | 光学的情報記録媒体とその製造方法、記録再生方法及び記録再生装置 |
JP2002260275A (ja) * | 2001-03-02 | 2002-09-13 | Sharp Corp | 光情報記録媒体 |
JP2003173573A (ja) * | 2001-12-07 | 2003-06-20 | Toshiba Corp | 光学情報記録媒体及び光ディスクドライブ |
Non-Patent Citations (1)
Title |
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See also references of EP1496508A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7645499B2 (en) * | 2002-10-10 | 2010-01-12 | Panasonic Corporation | Optical information recording medium and manufacturing method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP1496508A4 (en) | 2008-03-19 |
TW200405319A (en) | 2004-04-01 |
US20040246868A1 (en) | 2004-12-09 |
JP2003317314A (ja) | 2003-11-07 |
US7420908B2 (en) | 2008-09-02 |
EP1496508A1 (en) | 2005-01-12 |
TWI298160B (ja) | 2008-06-21 |
KR20040095607A (ko) | 2004-11-15 |
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