WO2004036559A1 - 多層情報媒体、その再生方法及び再生装置 - Google Patents
多層情報媒体、その再生方法及び再生装置 Download PDFInfo
- Publication number
- WO2004036559A1 WO2004036559A1 PCT/JP2003/010613 JP0310613W WO2004036559A1 WO 2004036559 A1 WO2004036559 A1 WO 2004036559A1 JP 0310613 W JP0310613 W JP 0310613W WO 2004036559 A1 WO2004036559 A1 WO 2004036559A1
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- WO
- WIPO (PCT)
- Prior art keywords
- information
- layer
- signal
- crosstalk
- multilayer
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/005—Reproducing
-
- 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
- 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 reproduces information from a multi-layer information medium by irradiating a high-energy beam such as a laser beam onto a multi-layer information medium having a thin film including three or more recording layers on a substrate.
- a high-energy beam such as a laser beam
- an optical recording medium capable of reproducing high-density information and a reproducing apparatus for an optical recording medium that reproduces information from the optical recording medium have been commercialized. Further, research and development of a multilayer information medium having a plurality of information layers capable of reproducing a high-quality moving image for a long time and a reproducing apparatus for the same have been actively conducted.
- Multilayer information medium as shown in FIG. 4, a plurality of information layers (first information layer 2 a, the second information layer 2 b, the third information layer 2 c) the first intermediate layer 4 a and made of a resin It is provided separately from the second intermediate layer 4b.
- Information recorded on each of the information layers 2a to 2c of the multilayer information medium is read by converging a laser beam spot on each of the information layers 2a to 2c. Disclosure of the invention
- the laser beam L In order to read information recorded on the third information layer 2c located farthest from the laser beam L incident side, it is necessary to focus the laser beam L on the third information layer 2c. However, when the laser light L is focused on the third information layer 2c, the laser light is focused on the third information layer 2c. Focus on ⁇ 1 At the same time, a part of the laser light is reflected by the second information layer 2b, and the reflected light also forms a focal point f2 on the first information layer 2a on the laser light L incident side. Then, the reflected light from the focal point f2 is reflected again by the second recording layer 2b, so that the signal of the first information layer 2a leaks into the signal of the third information layer 2c.
- the signal obtained by the third information layer 2c which is originally desired, is applied, and the signal obtained by the first information layer 2a is also detected. There was a problem that the signal quality deteriorated.
- each intermediate layer is made different from each other, the manufacturing process must be changed for each intermediate layer, resulting in an increase in manufacturing cost.
- the present invention has been made to solve the above-described problems, and when reproducing information from a multi-phase information medium having a plurality of information layers, the original reproduction is performed without reading signals from layers other than the information layer to be originally reproduced. It is an object of the present invention to provide a reproducing apparatus, a reproducing method, and a multi-phase recording medium capable of reproducing only a signal from an information layer to be reproduced with high quality.
- the reproducing method is a method for reproducing a multilayer information medium having at least three or more information layers.
- the reproducing method focuses a laser beam from a light source on the target information layer, detects mainly reflected light from the target information layer, generates an information signal, and generates crosstalk from information layers other than the target information layer.
- a crosstalk signal is generated by detecting light, and a signal component corresponding to the crosstalk signal is removed from the information signal from the target information layer to generate a reproduction signal indicating information recorded on the target information layer. I do.
- the gain of the crosstalk signal may be adjusted based on predetermined information, and the crosstalk signal may be amplified based on the gain, and the amplified crosstalk signal may be used as a signal component corresponding to the crosstalk signal. Used.
- the predetermined information is a crosstalk that leaks from another information layer when reproducing the target information layer.
- This is information indicating the ratio of light, and may be stored in a multilayer information medium. In that case, the predetermined information may be read from the multilayer information medium.
- the predetermined information preferably includes information on the reflectance and the transmittance when the laser beam is irradiated from the surface of the other information layer opposite to the light source side.
- the predetermined information preferably includes the reflectance and the transmittance for the two information layers.
- a reproducing device is a device for reproducing a multilayer information medium having at least three or more information layers.
- the reproducing device includes a light source that irradiates a laser beam to one information layer to read information recorded on the multilayer information medium, and a first device that mainly detects light reflected from the one information layer to generate an information signal.
- a detector, a second detector that detects reflected light from another information layer other than the one information layer and generates a crosstalk signal, and an information signal from the first detector and a second detection Differential means for obtaining a difference from a signal generated in accordance with a crosstalk signal from the device and generating a reproduced signal indicating information recorded in one information layer.
- the playback device may further include an amplifying unit that adjusts a gain of the crosstalk signal based on the predetermined information and amplifies the crosstalk signal based on the gain.
- the differential means takes the difference between the information signal from the first detector and the crosstalk signal amplified by the amplifying means.
- the predetermined information may be crosstalk information indicating a ratio of crosstalk light leaking from another information layer on the light source side when reproducing one information layer.
- the multilayer information medium may include a management area for storing the predetermined information.
- the reproducing apparatus may further include crosstalk information detecting means for reading predetermined information from the management area of the multilayer information medium.
- a multilayer information medium is an information medium that includes at least three or more information layers and that reproduces information with a laser beam emitted from a light source, and includes a management area that stores crosstalk information.
- the crosstalk information indicates the ratio of the crosstalk light leaking from another information layer on the light source side to the reflected light from the specific information layer when the specific information layer is reproduced.
- the thicknesses of the plurality of intermediate layers separating the plurality of information layers are substantially equal.
- the crosstalk information includes reflectance information when a laser beam is emitted from a surface of the other information layer opposite to the light source on the incident side.
- a management area is provided in one information layer, and information is not recorded in an area facing the management area on another information layer.
- K is provided in the information layer closest to the light source.
- crosstalk signal By removing (crosstalk signal), the quality of the reproduction signal of the target information layer can be improved. Further, according to the present invention, a crosstalk signal generated by an intermediate layer having the same thickness in a multilayer information medium can be removed. This has the excellent effect of simplifying the manufacturing process.
- FIG. 1 is a block diagram showing a configuration of a reproducing apparatus according to the present invention.
- FIG. 2 is a diagram showing a path of a laser beam emitted from the optical pickup and a reflected light thereof, and a schematic configuration of the optical pickup of the reproducing apparatus.
- FIG. 3A is a diagram showing a waveform of the output signal RF1 of the first detector 23a.
- FIG. 3B is a diagram showing a waveform of the output signal RF2 of the second detector 23b.
- FIG. 3C is a diagram showing a waveform of an output signal R F 2b of the variable gain amplifier 14.
- FIG. 3D is a diagram showing a waveform of the output signal RF3 of the differential amplifier 15.
- FIG. 4 is a cross-sectional view of a multilayer information medium for explaining a conventional problem.
- FIG. 1 is a block diagram showing a schematic configuration of an information medium reproducing apparatus according to the present invention.
- the reproducing device is a device that reproduces information recorded on the multilayer information medium 1.
- the reproducing apparatus includes a spindle motor 9 for rotating and driving the multilayer information medium 1, an optical pickup 10 for irradiating the multilayer information medium 1 with laser light, receiving a reflected light thereof and outputting a signal, and a multilayer information medium.
- a crosstalk information detection circuit 13 that reads the crosstalk information recorded in advance in 1, a gain variable amplifier 14 that amplifies the signal detected by the optical pickup 10, and a crosstalk information that is detected by the optical pickup 10. It comprises a differential amplifier 15 for taking the difference between the two signals, a controller 16 for adjusting the gain of the variable gain amplifier 14, and a reproduction signal processing circuit 17.
- the playback device having the above configuration generally performs the following operation.
- the optical pickup 10 irradiates the information layer to be read of the multilayer information medium 1 with a laser beam, and detects the signal recorded on the target information layer from the reflected light.
- the detected signal passes through a variable gain amplifier 14 and a differential amplifier 15 to remove a crosstalk signal, and then is input to a reproduction signal processing circuit 17 where predetermined signal processing is performed and a host computer It is output to an external device such as 30.
- the multilayer information medium 1 from which information is read by the reproducing apparatus has a multilayer structure including three information layers of a first information layer 2a, a second information layer 2b, and a third information layer 2c. Having.
- the first information layer 2a is the layer closest to the light source, and the third information layer 2c is the layer farthest from the light source.
- Each of the information layers 2a to 2c is separated by a first intermediate layer 4a and a second intermediate layer 4b having substantially the same thickness.
- each of the information layers 2a to 2c there are provided tracks in which uneven grooves used for a recordable information medium are provided in a spiral manner, and uneven pits which are used exclusively for reproduction and are arranged in the track direction.
- the formed information area is formed.
- the information area stores video data and computer data.
- address information for managing a recording position of information is formed in advance. For example, in the case of a read-only type multilayer information medium, address information is provided in an uneven pit together with an information signal.
- the multilayer information medium 1 has a management area 7 in a specific area, for example, on an information layer or a cartridge.
- the management area 7 stores the type of the multilayer information medium 1, reproduction conditions, or management information such as file information and directory information of recorded information.
- a value indicating the ratio of the amount of leakage of reflected light (crosstalk light) from other information layers to the amount of reflected light in each of the information layers 2a to 2c. Is stored.
- the crosstalk information includes, for information layers other than the intended information layer, the reflectance information and the transmittance information of the surface on the side opposite to the light incident side (light source side), and the reflection of the light incident side surface. Rate information and transmittance information are included. Further, as the crosstalk information, the gain of the amplifier 14 calculated based on the reflectance and transmittance of each information layer may be used.
- the crosstalk information is recorded in the management area 7 in the form of concave and convex pits at the manufacturing stage, or as a recording mark in the case of a writable medium.
- the information layers from the third information layer 2c located farthest from the light source to the information layer (that is, the first information layer) 2a at least two layers closer to the light source are For the reflectance information and transmittance information on the surface opposite to the light incident side, and the second information layer 2b! ), Reflectance information of the light incident side surface. Reflectance of the first information layer 2 a opposite to the surface and the light incident side, the transmittance and r 1, when the reflectance of the second information layer 2 b of the incident side of light, of the amplifier 1 4 gain g is determined as X ⁇ X r 2.
- the management area 7 in which the management information is stored is preferably provided only in the first information layer 2a closest to the light source. This is because, when the management area 7 is provided on the first information layer 2a, when the original focus of the beam spot (hereinafter referred to as “first focus”) f1 is formed on the first information layer 2a. Since another focus (hereinafter referred to as “second focus”) f 2 is not formed on the other information layers 2 b to 2 c, the influence of the second focus f 2 is removed and stored in the management area 7. This is because the management information is read with high quality.
- the management area 7 on the third information layer 2c far from the light source side on the areas facing the management area 7 on the other information layers 2a and 2b, Prefer not to record information No. This means that even if the beam spot focuses the first focus f1 on the third information layer 2c and the second focus f2 on the first information layer 2a, the signal from the first information layer 2a is This is because leakage can be eliminated.
- FIG. 2 is a diagram illustrating a reproduction optical system of the optical pickup 10 and a path of irradiation light from the optical pickup 10 and reflected light thereof.
- the optical pickup 10 has an objective lens 21 and a detection lens 22.
- the detection element 23 includes two detectors, a first detector 23a and a second detector 23b.
- the second detector 23 b serves as a light-receiving area outside the first detector 23 a, and after the incident beam is reflected by the second information layer 2 b and collected at the second focal point f 2, The light that has passed through the information layer 2a and returned into the optical pickup 10 is received.
- the reflected light from the first focal point f1 and the second focal point f2 becomes parallel light by the objective lens 21 and is condensed by the detection lens 22. Therefore, the reflected light falls within the first detector 23a.
- the light passing through the second focal point f 2 on the first information layer 2 a becomes light diffused through the objective lens 21, including the first detector 23 a through the detection lens 22, And it is incident on a wide range of the second detector 23 b. If the first detector 23a is designed to be sufficiently smaller than the second detector 23b, the second detector 23b can detect a sufficient amount of crosstalk light.
- the second detector 23b converts the received light into an electric signal. That is, the signal of the first information layer 2a is output as the electric signal RF2.
- the output signal R F 2 is input to the variable gain amplifier 14.
- the playback device of the present embodiment reads out crosstalk information for the multilayer information medium 1 from the management area 7 of the multilayer information medium 1 when the multilayer information medium 1 is mounted.
- the reproducing apparatus adjusts the gain of the variable gain amplifier 14 based on the read crosstalk information during the subsequent reproducing operation, and cancels the crosstalk signal component included in the reproduced signal.
- the spindle motor 9 rotates, and the multilayer information medium 1 rotates at CAV (constant rotation speed) or CLV (constant linear velocity).
- the optical pickup 10 illuminates the beam spot on the management area 7 on the multilayer information medium 1.
- the reflected light is received by the first detector 23a.
- the reflected light is modulated according to the information recorded in the management area 7 (for example, according to a concave / convex pit or a change in reflectance of the information layer).
- the first detector 23a outputs the modulated reflected light amount as an electric signal RF1.
- the crosstalk information detection circuit 13 inputs and demodulates the RF1 signal from the control area 7 detected by the first detector 23a, and reads the crosstalk information of each information layer of the multilayer information medium 1. Output to controller 16.
- the controller 16 adjusts the amplification value (gain) of the variable gain amplifier 14 based on the read crosstalk information.
- the controller 16 identifies to which information layer the beam spot is focused on the first focal point f1 by the address, which is the positional information of the multilayer information medium 1, and according to the identification result, the variable gain amplifier 1 Variable control of the amplification value of 4.
- the controller 16 amplifies the variable gain amplifier 14 based on the read crosstalk information so that the crosstalk signal component is sufficiently canceled. Is determined and output.
- the controller 16 sets the output amplification to zero because no crosstalk from other information layers occurs.
- Crosstalk information is obtained as described above.
- FIGS. 3A to 3D are diagrams showing output signal waveforms of each section of the reproducing apparatus during the reproducing operation.
- Figure 3A shows the waveform of the output signal RF1 of the first detector 23a
- Figure 3B shows the waveform of the output signal RF2 of the second detector 23b
- Figure 3C shows the output signal of the variable gain amplifier 14.
- the waveform of RF 2 and FIG. 3D shows the waveform of the output signal RF 3 of the differential amplifier 15.
- the optical pickup 1 0 a beam spot on the third information layer 2 c is the focus jump, the first focus f 1 of the third information layer 2 c Collect light.
- the reflected light from the third information layer 2c is received by the first detector 23a in the optical pickup 10, and is converted into an electric signal as a reproduction signal of the third information layer 2c.
- a part of Hikaribi over beam L is reflected by the second information layer 2 b, the reflected light is in the first information layer 2 a
- the light is focused on two focal points f2.
- the reflected light of the light beam converged on the second focal point f2 of the first information layer 2a is reflected again by the second information layer 2b and received by the first detector 23a.
- both the reflected light from the third information layer 2c and the reflected light from the first information layer 2a enter the first detector 23a, and the third information layer 2c and the The signal of 1 information layer 2a is converted into an electric signal RF1 and output (see Fig. 3A).
- the output RF 1 signal is input to the differential amplifier 15.
- the second detector 23 b reflects reflected light that has been reflected by the second information layer 2 b and condensed at the second focal point f 2, and then transmitted through the first information layer 2 a and returned to the optical pickup 10. And converts it into an electrical signal RF2 and outputs it (see Fig. 3B).
- the electric signal RF2 includes a crosstalk signal.
- the signal (crosstalk signal) generated by the reflected light received by the second detector 23 b has an intensity about 1/20 that of the reflected light received by the first detector 23 a. It becomes a weak signal. Therefore, the signal generated by the second detector 23 b is converted by the variable gain amplifier 14 to sufficiently cancel the crosstalk signal component included in the information signal detected by the first detector 23 a.
- the signal is amplified to an appropriate level (for example, 20 times) and output as the signal RF2b (see Fig. 3C).
- the gain of the variable gain amplifier 14 is controlled by the controller 16 based on the crosstalk information read by the crosstalk information detection circuit 13 as described above.
- the differential amplifier 15 calculates the difference between the signal RF1 from the first detector 23a and the signal RF2b amplified by the variable gain amplifier 14. That is, from the signal RF1 including the signal component of the third information layer 2c and the signal component of the first information layer 2a, only the signal component of the first information layer 2a is included, and an appropriate level is obtained.
- the amplified signal RF2b is synchronized with the signal RF1 and canceled.
- the differential amplifier 15 outputs a signal RF3 including only the signal component of the third information layer 2c to the reproduction signal processing circuit 17 (see FIG. 3D).
- the signal R F3 obtained in this manner is a signal containing only the signal component of the information originally desired, with the crosstalk signal component canceled.
- the reproduction signal processing circuit 17 demodulates and decodes the signal RF3 and outputs it to an external device (for example, a host computer 30) as moving image data or computer data, or to a display unit (not shown).
- an external device for example, a host computer 30
- the signal from the third information layer 2c force and the leakage signal from the first information layer 2a force The output signal of the first detector 23a receiving the combined signal and the output signal of the second detector 23b receiving the leakage signal from the first information layer 2a are detected.
- the crosstalk information is detected from the management area 7 when the multilayer information medium 1 is inserted into the playback device, but the detection timing of the crosstalk information is not limited to this. For example, during operation, crosstalk information may be periodically detected.
- the second detector 23 b that detects the leakage signal from another layer from the output signal of the first detector 23 a that is the main detector.
- the reproducing method and the reproducing apparatus according to the present invention eliminate the influence of a crosstalk signal from an information layer other than the target information layer, and can generate a high-quality reproduced signal.
- the present invention can be applied to a device for reproducing information by irradiating a multilayer information medium containing a laser beam with a laser beam. Further, the information medium of the present invention can be used for such a reproducing apparatus.
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- Optical Recording Or Reproduction (AREA)
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Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03808862A EP1555659A4 (en) | 2002-10-15 | 2003-08-22 | MULTILAYER INFORMATION MEDIUM, PLAYING METHOD AND REPRODUCTION DEVICE THEREFOR |
US10/531,387 US20060139803A1 (en) | 2002-10-15 | 2003-08-22 | Multilayer information medium, reproduction method and reproduction device thereof |
JP2004544732A JPWO2004036559A1 (ja) | 2002-10-15 | 2003-08-22 | 多層情報媒体、その再生方法及び再生装置 |
AU2003254960A AU2003254960A1 (en) | 2002-10-15 | 2003-08-22 | Multi-layer information medium, reproduction method and reproduction device thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002300107 | 2002-10-15 | ||
JP2002/300107 | 2002-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004036559A1 true WO2004036559A1 (ja) | 2004-04-29 |
Family
ID=32104974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010613 WO2004036559A1 (ja) | 2002-10-15 | 2003-08-22 | 多層情報媒体、その再生方法及び再生装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060139803A1 (ja) |
EP (1) | EP1555659A4 (ja) |
JP (1) | JPWO2004036559A1 (ja) |
CN (1) | CN1689080A (ja) |
AU (1) | AU2003254960A1 (ja) |
WO (1) | WO2004036559A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7639593B2 (en) | 2004-10-28 | 2009-12-29 | Tdk Corporation | Multi-layer optical recording medium and method for evaluating optical recording system |
JP2010129111A (ja) * | 2008-11-26 | 2010-06-10 | Hitachi Ltd | 光ディスク、光ディスク記録方法、光ディスク再生方法、および光ディスク装置 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4972560B2 (ja) * | 2005-12-15 | 2012-07-11 | パナソニック株式会社 | 光ディスク装置、クロストーク補正方法および集積回路 |
JP2007265514A (ja) * | 2006-03-28 | 2007-10-11 | Hitachi Maxell Ltd | 光ディスクマガジンシステム及び光ディスク記録・再生システム |
DE102006015604A1 (de) * | 2006-04-04 | 2007-10-11 | Tesa Scribos Gmbh | Speichermedium, vorzugsweise für einen Träger, sowie Lesevorrichtung und Verfahren zum Lesen eines solchen Speichermediums |
WO2008110960A1 (en) * | 2007-03-12 | 2008-09-18 | Koninklijke Philips Electronics N.V. | A method of writing data to an optical record carrier and an optical recording device for writing data to an optical record carrier |
JP2009043320A (ja) | 2007-08-08 | 2009-02-26 | Hitachi Ltd | 光記録媒体の再生信号の測定方法、信号再生装置及び光記録媒体 |
JP2009181614A (ja) * | 2008-01-29 | 2009-08-13 | Sanyo Electric Co Ltd | 光ディスクおよび光ディスク装置 |
CN115828058B (zh) * | 2022-10-31 | 2023-10-13 | 芯思杰技术(深圳)股份有限公司 | 消除串扰信号的方法及其装置、电子设备 |
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2003
- 2003-08-22 WO PCT/JP2003/010613 patent/WO2004036559A1/ja active Application Filing
- 2003-08-22 AU AU2003254960A patent/AU2003254960A1/en not_active Abandoned
- 2003-08-22 JP JP2004544732A patent/JPWO2004036559A1/ja not_active Withdrawn
- 2003-08-22 US US10/531,387 patent/US20060139803A1/en not_active Abandoned
- 2003-08-22 EP EP03808862A patent/EP1555659A4/en not_active Withdrawn
- 2003-08-22 CN CNA038242982A patent/CN1689080A/zh active Pending
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7639593B2 (en) | 2004-10-28 | 2009-12-29 | Tdk Corporation | Multi-layer optical recording medium and method for evaluating optical recording system |
JP2010129111A (ja) * | 2008-11-26 | 2010-06-10 | Hitachi Ltd | 光ディスク、光ディスク記録方法、光ディスク再生方法、および光ディスク装置 |
Also Published As
Publication number | Publication date |
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JPWO2004036559A1 (ja) | 2006-02-16 |
EP1555659A1 (en) | 2005-07-20 |
EP1555659A4 (en) | 2008-03-26 |
CN1689080A (zh) | 2005-10-26 |
AU2003254960A1 (en) | 2004-05-04 |
US20060139803A1 (en) | 2006-06-29 |
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