WO2011118070A1 - Disque optique et dispositif à disque optique - Google Patents

Disque optique et dispositif à disque optique Download PDF

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Publication number
WO2011118070A1
WO2011118070A1 PCT/JP2010/068383 JP2010068383W WO2011118070A1 WO 2011118070 A1 WO2011118070 A1 WO 2011118070A1 JP 2010068383 W JP2010068383 W JP 2010068383W WO 2011118070 A1 WO2011118070 A1 WO 2011118070A1
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WO
WIPO (PCT)
Prior art keywords
reproduction
optical disc
area
data recording
disc
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Application number
PCT/JP2010/068383
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English (en)
Japanese (ja)
Inventor
育則 久保
Original Assignee
日立コンシューマエレクトロニクス株式会社
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Publication date
Application filed by 日立コンシューマエレクトロニクス株式会社 filed Critical 日立コンシューマエレクトロニクス株式会社
Publication of WO2011118070A1 publication Critical patent/WO2011118070A1/fr

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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
    • 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

Definitions

  • the present invention relates to an optical disc and an optical disc apparatus for recording and reproducing data.
  • Patent Document 1 describes that an optimum gain value of a limit equalizer obtained by analyzing an information carrier in advance is stored on the information carrier, and this value is set when the disk device reads and reproduces the value. Has been.
  • the conditions for reproducing data properly for optical disks are defined by the disk standards.
  • the disk standards stipulates that data is appropriately reproduced when the gain value of the equalizer that processes the read reproduction signal is 7 dB.
  • a disc manufacturer needs to produce a disc having characteristics that allow data to be properly reproduced under the reproduction conditions defined in the disc standard.
  • the optical disc apparatus can reproduce data properly by applying the reproduction conditions defined in the disc standard when reproducing the BD-R disc. Will be able to.
  • An object of the present invention is to provide an optical disc that solves the above-described problems, can reduce a load generated when a disc manufacturer manufactures a disc, and can read data recorded on the disc with high quality.
  • the disk manufacturer can relax the specifications of the disk by the present invention, and can easily manufacture a multilayer disk and a high-density disk. Further, the optical disk device can read out the data recorded on each recording layer with high quality by reading the optimum reproduction condition from the disk.
  • FIG. 1 shows an example of reproduction quality characteristics of an optical disc with respect to reproduction laser power.
  • the horizontal axis 101 represents the reproduction laser power set when reading data.
  • a vertical axis 102 represents a quality index value (for example, the number of reproduction errors) when the data recorded on the optical disk is reproduced, and indicates that the reproduction quality is good as it goes downward.
  • a straight line 103 represents a reference value of a reproduction quality index at which recorded data can be reproduced, and indicates that data can be read from the disc if this reference value is satisfied.
  • Curves 104 and 105 represent the reproduction quality characteristics of the optical disk.
  • the reproduction quality is the best at reproduction laser power P0 in characteristic 104 and reproduction laser power P1 in characteristic 105.
  • the reproduction laser power with the best reproduction quality such as P0 and P1 is referred to as the optimum power.
  • the optical disk of the present embodiment records the optimum power P0 on the disk if the characteristic of the optical disk has 104, for example, and records the optimum power P1 on the disk if the characteristic of the optical disk has 105, for example. It is a feature to keep.
  • the area where the optimum power is recorded is an area where reproduction is possible with a uniquely determined reproduction laser power.
  • the area for recording the optimum power is referred to as a power management area
  • the laser power for reproducing the uniquely determined area is referred to as management data power.
  • a disk manufacturer that manufactures the disk of the present invention analyzes the reproduction quality characteristics of the disk to determine the optimum power, and records the power in the power management area in advance.
  • the optical disc apparatus reads the optimum power information recorded in the power management area using the management data power, and reproduces the read optimum power in each area on the disc. Set to to play data.
  • the optical disk apparatus can read the optimum power from the disk by reproducing the area where the optimum power is recorded with the management data power so that the optimum power can be reliably read regardless of the characteristics of the disk. Problems that cannot be solved.
  • the tolerance to reproduction laser power (reproduction light resistance) varies depending on the disc manufacturer or the difference in the composition of the recording film for each layer of the multi-layer disc.
  • the reference value 103 in FIG. 1 may be a level at which an error can be sufficiently corrected by, for example, an error correction code recorded together with data.
  • an error rate, jitter, etc. of reproduction data generally used in the conventional optical disc apparatus may be measured.
  • the features of the optical disk of the present invention have been described by taking the reproduction laser power as an example.
  • an equalizer gain value used for reproduction signal processing may be used.
  • it may be a reference level value (for example, PR (1, 2, 2, 2, 1)) of a Viterbi decoder included in PRML (Partial-Response Maximum-Likelihood) which is a reproduction signal detection method obtained from a disc. Since PRML is a known technique, description thereof is omitted here.
  • optical disc of the present invention can be realized with the configuration of an optical disc as shown in FIG.
  • FIG. 2 is a diagram showing a configuration example of the optical disc of the present invention having three recording layers. Let each recording layer be L0, L1, L2 from the disk surface side.
  • the optical disc 201 has a BCA (Burst Cutting Area) area 202, a first management data area 203, a user data area 204, and a second management data area 205 from the inner periphery side.
  • BCA Band Cutting Area
  • the BCA area 202 is an area for recording data immediately after manufacture of the disk, and for example, identification data of the disk is recorded.
  • the user data area 204 is an area in which user data is written, and audio / video data and the like are recorded.
  • the management data areas 203 and 205 are areas in which data managed by the optical disc apparatus is written, and record data recording conditions, disc defect management information, and the like.
  • the BCA area 202 data is generally described by a barcode, and the recording density is independent of other areas. These are recorded by burning off the reflective film with a powerful infrared laser called YAG laser after manufacturing the disk.
  • This area has a low data recording density and a format that can be easily reproduced by the optical disc apparatus.
  • the optical disk apparatus performs focusing servo to the recording layer at the BCA radial position, the reflected light level from the optical disk becomes bar code data that repeats strength.
  • This bar code data is a BCA code.
  • the BCA area 202 has playback conditions independent of other areas, and it can be said that the playback conditions are uniquely determined regardless of the characteristics of the disc. Therefore, in the optical disc of the present invention, for example, the BCA area 202 is used as a power management area, and the optimum powers of L0, L1, and L2 are recorded in this area.
  • the optimum power recorded on the disc includes all optimum powers corresponding to the respective recording areas of all the recording layers.
  • the power management area may be provided in each of a plurality of layers. Further, it may be provided anywhere from the inner periphery to the outer periphery of the disk.
  • FIG. 3 shows an example of the power management area in the optical disc of this embodiment.
  • BCA area an area where disc identification data and the like are recorded with a barcode as described above.
  • PIC area is a management data area in the BD-R, and is formed of, for example, a high-frequency groove (a rectangular wave groove). This area is formed in the same manner as the wobbled groove in the data area by a stamper or the like at the time of manufacturing the disk, and recording conditions and the like determined in advance at the time of manufacturing the disk are recorded.
  • the power management area be an area where the recording density is lower than other areas and reproduction is easy.
  • a data density may be made lower than that of the other region by providing a region formed by a groove having a lower wobble frequency than the other region.
  • the density may be an area having a higher reflectance than the other areas. If the area as shown in (d) is used as the power management area, a good S / N ratio can be obtained even when the optical disc apparatus reads out the optimum power when reproducing a multi-layer disc having 10 or more recording layers, for example. Can do.
  • 401 is an optical disk
  • 402 is an optical pickup
  • 403 is a laser control unit
  • 404 is a reproduction signal processing unit
  • 405 is a spindle control unit
  • 406 is a servo control unit
  • 407 is a system control unit
  • 408 is a storage unit.
  • An optical disc 401 represents an optical disc according to the present invention
  • reference numeral 409 shown in the optical disc 401 represents a power management area in which the optimum power of the optical disc 401 is recorded in advance.
  • a memory is used for example.
  • the system control unit 407 controls the spindle control unit 405 and the servo control unit 406 to rotate the optical disc 401 and position the optical pickup 402 at the reproduction start position, and then the optical pickup 402.
  • the laser controller 403 is controlled so that the laser on the optical head above emits light with a desired reproduction power.
  • the laser control unit 403 emits a laser beam that emits light with a desired reproduction power.
  • the light spot of the irradiated laser beam is focused on the position where data is to be reproduced from the optical disc 401.
  • the reflected light of the laser beam irradiated on the optical disc 401 is converted into an electric signal by the light receiving element of the optical pickup 402 or the like.
  • the electrical signal output from the optical pickup 402 is sent to the reproduction signal processing unit 404, subjected to analog signal processing such as signal amplitude adjustment, digital signal processing such as binarization processing, and the like. It is converted into digital data that is a bit string. In this way, data reproduction processing is performed.
  • the optimum power is read from the power management area on the disk using the management data power during the setup process for the inserted disk, and the read optimum power is applied when reproducing each area. Good reproduction quality can be obtained.
  • FIG. 5 is a flowchart showing a part of the flow of the setup process in the present embodiment.
  • the system control unit 407 first sets the management data power for reproducing the power management area 409 by controlling the laser control unit 403 (S501). Then, the area 409 is reproduced by the reproduction process described above (S502). The data read from the area 409 includes the optimum power for reproducing the optical disc 401, and the system control unit 407 stores the acquired data in the storage unit 408 (S503).
  • FIG. 6 is a flowchart showing the flow of the reproduction process in this embodiment.
  • the system control unit 407 first reads the optimum power of the reproduction target area stored in the storage unit 408, for example, and controls the laser control unit 403 to obtain the read optimum power. Setting is made (S601). Then, the data recorded in the reproduction target area is reproduced under the optimum power (S602).
  • S601 the data recorded in the reproduction target area is reproduced under the optimum power
  • good reproduction performance can be obtained by setting the optimum power in each recording area in the reproduction operation. And since this optimal power is acquired from the data read at the time of setup, it is not necessary to perform a useless process and is efficient.
  • FIG. 4 shows only parts necessary for explaining the present embodiment. Further, each part shown in FIG. 4 is a part provided in a normal optical disc apparatus. Therefore, the storage unit 408 in FIG. 4 does not need to be individual, and may actually be allocated to a partial area of the rewritable nonvolatile memory used by the system control unit 407, for example.
  • the optical disc apparatus can execute an appropriate reproduction process.
  • the above description has been made with reference to the physical structure of a general optical disc.
  • the format of the disc does not have to be a conventional method, and the structure itself does not have to be a structure like an optical disc. .
  • the reproduction process on the optical disk is taken as an example.
  • the reproduction condition is recorded on the data recording medium and the condition is read and set, the recorded data can be read out.
  • the present invention records not only the optical disc but also other data recording media, by recording the reproduction conditions of each recording area on the medium, and manufacturing a data recording medium having a recording area that can be reproduced under those conditions. It can also be implemented in a hologram memory or the like.
  • this invention is not limited to the above-mentioned Example, Various modifications are included.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
  • each of the above-described configurations may be configured such that a part or all of the configuration is configured by hardware, or is realized by executing a program by a processor.
  • control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

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  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Head (AREA)

Abstract

Pour la fabrication de disques optiques multicouches et de disques optiques à haute densité, on estime que la réflectance et l'épaisseur de la plaque, notamment, devront être gérées de manière plus rigoureuse que naguère, avec pour corollaire une charge excessive imposée aux fabricants de disques. De plus, et même si les conditions de reproduction sont enregistrées sur le disque, un dispositif à disque optique ne peut pas effectuer une reproduction dans des conditions appropriées au point de lecture de ces conditions, et des préoccupations se font jour quant à la capacité de ces disques de lire les conditions de reproduction enregistrées. Dans un souci de résoudre les problèmes susmentionnés, on enregistre dans le disque optique de l'invention des conditions de reproduction optimum (par exemple en recourant à la puissance laser de reproduction) dans une région du disque où la reproduction est possible dans les conditions de reproduction clairement spécifiées. Un dispositif à disque optique lit les conditions de reproduction clairement spécifiées et la reproduction devient possible conformément au temps de reproduction de données.
PCT/JP2010/068383 2010-03-24 2010-10-19 Disque optique et dispositif à disque optique WO2011118070A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-067203 2010-03-24
JP2010067203A JP2011198444A (ja) 2010-03-24 2010-03-24 光ディスク及び光ディスク装置

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WO2011118070A1 true WO2011118070A1 (fr) 2011-09-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2487115A (en) * 2010-12-29 2012-07-11 Gen Electric Read power control for multilayer micro hologram disc

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101002216B1 (ko) 2008-10-21 2010-12-20 경상대학교산학협력단 배플을 이용한 교반용기 및 이를 포함하는 교반능력이 향상된 교반기

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0773506A (ja) * 1993-08-31 1995-03-17 Victor Co Of Japan Ltd 光記録媒体及びその再生装置
JPH09320094A (ja) * 1996-05-27 1997-12-12 Nikon Corp 光ディスクの再生方法及び光ディスク
JP2006344322A (ja) * 2005-06-10 2006-12-21 Hitachi Ltd 光ディスク記録方法、光ディスク記録装置、光ディスク再生方法、光ディスク再生装置、および、光ディスク
JP2006351123A (ja) * 2005-06-16 2006-12-28 Sanyo Electric Co Ltd 光ディスクおよび光ディスク装置
JP2007317313A (ja) * 2006-05-26 2007-12-06 Tdk Corp 光ディスク、光ディスクの再生方法及びシステム
JP2008521155A (ja) * 2004-11-18 2008-06-19 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 情報担体からの情報再生

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0773506A (ja) * 1993-08-31 1995-03-17 Victor Co Of Japan Ltd 光記録媒体及びその再生装置
JPH09320094A (ja) * 1996-05-27 1997-12-12 Nikon Corp 光ディスクの再生方法及び光ディスク
JP2008521155A (ja) * 2004-11-18 2008-06-19 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 情報担体からの情報再生
JP2006344322A (ja) * 2005-06-10 2006-12-21 Hitachi Ltd 光ディスク記録方法、光ディスク記録装置、光ディスク再生方法、光ディスク再生装置、および、光ディスク
JP2006351123A (ja) * 2005-06-16 2006-12-28 Sanyo Electric Co Ltd 光ディスクおよび光ディスク装置
JP2007317313A (ja) * 2006-05-26 2007-12-06 Tdk Corp 光ディスク、光ディスクの再生方法及びシステム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2487115A (en) * 2010-12-29 2012-07-11 Gen Electric Read power control for multilayer micro hologram disc

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