WO2005081241A1 - Support d'enregistrement d'information optique et dispositif d'enregistrement/de reproduction optique - Google Patents

Support d'enregistrement d'information optique et dispositif d'enregistrement/de reproduction optique Download PDF

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Publication number
WO2005081241A1
WO2005081241A1 PCT/JP2005/002769 JP2005002769W WO2005081241A1 WO 2005081241 A1 WO2005081241 A1 WO 2005081241A1 JP 2005002769 W JP2005002769 W JP 2005002769W WO 2005081241 A1 WO2005081241 A1 WO 2005081241A1
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WO
WIPO (PCT)
Prior art keywords
information recording
base material
information
recording medium
material thickness
Prior art date
Application number
PCT/JP2005/002769
Other languages
English (en)
Japanese (ja)
Inventor
Shinya Abe
Shin-Ichi Tanaka
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2005081241A1 publication Critical patent/WO2005081241A1/fr

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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

Definitions

  • the present invention relates to an optical information recording medium including at least one information recording layer, and an information recording / reproducing apparatus for recording / reproducing information on / from the optical information recording medium.
  • the numerical aperture of a lens used for converging recording / reproducing light on an information recording layer of an optical information recording medium has been relatively small.
  • the numerical aperture of a lens used for an optical information recording medium such as a CD (Compact Disk) or a DVD (Digital Versatile Disk) is small. Even a DVD using a lens with a larger numerical aperture than a CD is 0.6.
  • the allowable error of the substrate thickness is determined by the optical design of the lens.
  • the base material thickness is specified to be 0.6 ⁇ 0.03 mm. If the thickness of the single-layer DVD substrate exceeds this range, the reproduction signal will deteriorate and the recording / reproducing accuracy will decrease.
  • an optical information recording medium capable of recording information at a higher density than a DVD has been developed.
  • a BD Blu-ray Disk
  • BD Blu-ray Disk
  • the thickness of the medium base material is designed to be thin in order to suppress the occurrence of aberration with respect to the tilt of the optical information recording medium.
  • the thickness of the base material is designed to be 0.1 mm in order to secure the margin for tilt as much as that of DVD.
  • the optical information recording medium is disk-shaped, it is not easy to dynamically follow the deviation of the substrate thickness within one rotation of the disk, but the average substrate thickness between different disks is not easy.
  • the deviation can be dealt with by correcting the spherical aberration at the beginning of the recording / reproducing operation.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2000-76705
  • the optical information recording medium of the present invention includes at least one information recording layer capable of reproducing information by irradiating light, and records substrate thickness information indicating substrate thickness information indicating the substrate thickness. It is characterized by further including a part.
  • the thickness of the substrate refers to a distance from the light incident surface of the optical information recording medium to the surface of the information recording layer.
  • the optical information recording medium of the present invention includes not only a read-only medium but also a recordable (write-once, rewritable) medium. When recording is possible, the information recording layer can record and reproduce information by irradiating light.
  • the substrate thickness information recording section is formed, for example, on the information recording layer.
  • An information recording / reproducing apparatus of the present invention is an information recording / reproducing apparatus used for the optical information recording medium of the present invention described above, wherein the base material thickness information recorded on the optical information recording medium is recorded.
  • a reproducing unit for reproducing a correction value storing unit in which a correction value of the spherical aberration set according to the substrate thickness is stored in advance, and the substrate thickness information obtained by the reproducing unit, Correction value determining means for determining a correction value of spherical aberration using the correction value storage means, and spherical aberration correcting means for correcting spherical aberration using the correction value determined by the correction value determining means.
  • FIG. 1 is a perspective view, including a cross section, showing an embodiment of the optical information recording medium of the present invention. is there.
  • FIG. 2 is a schematic diagram showing a BCA (Burst Cutting Area) mark.
  • FIG. 3A shows a sample (disc A) of an optical information recording medium having the configuration shown in FIG.
  • FIG. 7 is a waveform diagram of a reproduced signal obtained when reproducing the BCA.
  • FIG. 3B is a waveform diagram of a reproduced signal obtained when BCA is reproduced for a sample (disc B) of the optical information recording medium having the configuration shown in FIG.
  • FIG. 4 is a block diagram showing an embodiment of the information recording / reproducing apparatus of the present invention.
  • base material thickness information indicating the base material thickness is recorded. Therefore, when recording or reproducing information on or from the optical information recording medium of the present invention, first, the base material thickness information is read, and the spherical aberration of the device used for recording and reproduction is read in accordance with the read base material thickness information. It is possible to set a correction value. For example, the spherical aberration corrected by the correction value set in this way can be used as an initial value of learning for optimizing the spherical aberration.
  • the optical information recording medium of the present invention does not require such learning.
  • the time required for correcting spherical aberration can be reduced as compared with the case of. As a result, the time from when the optical information recording medium is set in the apparatus to when it is started can be reduced.
  • the base material thickness information is recorded at a lower recording density and a lower recording density than other information recorded on the information recording layer.
  • the mark length of the recording mark used for recording the base material thickness information is set to be different from the recording mark used for recording other information recorded on the information recording layer. I'll make it longer.
  • the configuration of the optical information recording medium of the present invention provides information capable of reproducing information by irradiating light.
  • the present invention is also applicable to a medium having a multilayer structure in which a plurality of information recording layers are provided.
  • the information recording layer may include a plurality of information recording layers in which the substrate thickness information of the information recording layer is recorded. It is preferable that the substrate thickness information is recorded on the information recording layer located on the side of incident light.
  • the substrate thickness information recorded in this case may be information indicating the light incident surface power of the optical information recording medium and the distance to the surface of the information recording layer on which the substrate thickness information is recorded. desirable.
  • the recorded base material thickness information is the information located closest to the light incident side from the light incident surface of the medium. This is the distance to the surface of the recording layer.
  • the information recording layer located closest (to the light incident side) from the light incident surface of the medium and the information recording layer located furthest (to the anti-light incident side) from the light incident surface of the medium first This is because the focus servo is used.
  • the base material thickness information may be recorded by a barcode mark.
  • the barcode-shaped mark means, for example, when the optical information recording medium of the present invention has a disk shape, has a shape that is long in the radial direction of the medium and is arranged in a plurality in the circumferential direction. That is.
  • the optical information recording medium of the present invention is also applicable to high-density recording using short-wavelength light for recording and reproduction and using a lens with a large aperture.
  • the thickness of the base material is preferably 0.1 mm or less. Further, information may be reproduced by irradiation with light passing through a lens having a numerical aperture of 0.8 or more. If the optical information recording medium is a recordable medium, light that has passed through a lens having a numerical aperture of 0.8 or more can be used for recording.
  • the information recording / reproducing apparatus of the present invention since the correction value of the spherical aberration can be determined using the base material thickness information recorded on the optical information recording medium, the time required for correcting the spherical aberration can be reduced. Can be shortened. Further, the information recording / reproducing apparatus of the present invention reproduces information recorded on an optical information recording medium with the spherical aberration corrected using the correction value determined by the correction value determining means as an initial value. Learning to optimize spherical aberration may be performed using the signal obtained by the above. This allows for more accurate spherical aberration correction.
  • FIG. 1 is a perspective view including a cross section schematically showing the optical information recording medium of the present embodiment.
  • the optical information recording medium of the present embodiment is a read-only disk, and a reflective film (information recording layer) 102 and a cover layer 103 are laminated on a substrate 101.
  • a substrate 101 for example, a polycarbonate substrate is used, and information is recorded by pits on the surface on the reflection film 102 side.
  • the reflection film 102 is formed of, for example, an A1 alloy. Since the reproduction light enters from the cover layer 103 side, the cover layer 103 is formed of a transparent material.
  • An inner side of the optical information recording medium according to the present embodiment is provided with a BCA (Burst Cutting Area) in which identification information unique to the medium such as a serial number can be recorded.
  • Information is recorded on the BCA as a barcode mark (hereinafter referred to as a BCA mark).
  • This BCA mark can be formed overlapping the pit.
  • a BCA is used as a base material thickness information recording unit, and in this area, a barcode shape having a long shape in the radial direction of the medium and a plurality of barcodes arranged in the circumferential direction is used.
  • the base material thickness information is recorded by the mark 104.
  • the substrate thickness in this embodiment corresponds to the distance from the light incident surface of the medium to the surface of the reflective film 102, that is, the thickness of the cover layer 103.
  • the BCA mark 104 can be formed after laminating the reflective film 102 and the cover layer 103 on the substrate 101.
  • a rectangular YAG laser (the wavelength of the emitted light is 1064 nm, for example) can be used.
  • the reflection film 102 at the portion irradiated with the pulse is removed, and the BCA mark 104 whose interval is modulated by the signal to be recorded is formed.
  • the BCA mark 104 can be reproduced while focusing on the reflection film 102 using an optical head.
  • FIG. 2 is a schematic diagram showing the BCA mark 104.
  • the mark length of the BCA mark 104 corresponds to the width W of the BCA mark 104.
  • width W of BCA mark 104 is approximately 8 ⁇ .
  • the interval between adjacent BCA marks 104 is set to 1, 2, 3 or 4 times the basic interval of 28.6 / im. By changing the mark interval in this manner, the base material thickness information is recorded.
  • the mark length of the BCA mark 104 formed as described above is longer than the mark length of other recorded information (here, the length of the pit formed on the substrate 101). Hiro, Therefore, the recording density of the BCA mark 104 is lower than the recording density of pits, which are other information recorded. Thus, even if the spherical aberration does not match the thickness of the base material, the optical head can be used to reproduce the BCA mark 104 and detect the recorded base material thickness information.
  • the BCA mark 104 is reproduced.
  • the optical information recording medium of the present embodiment two types of samplers were prepared.
  • One is a 22-nm-thick reflective film 102 made of A1 alloy and an ultraviolet-curing resin (UV resin) formed on a 1.1-mm-thick polycarbonate substrate 101 on which information is recorded by pits.
  • a disk A in which a cover layer 103 having a thickness of 100 / im is laminated, and the other is a disk B similar to the disk A except that the thickness of the cover layer 103 is 75 / im.
  • the width W of the BCA mark 104 recorded on the discs A and B was about 8 ⁇ m, and the mark interval was set to 1, 2, 3, or 4 times as long as the basic interval was 28.6 ⁇ . .
  • the random data force S having the shortest pit length of 0.149 ⁇ and the track pitch of 0.35 ⁇ are recorded on the base of the BCA mark 104 (the surface of the substrate 101).
  • BCA was reproduced from the above discs A and B using an optical head including a light source that emits laser light having a wavelength of 405 nm and an objective lens having a numerical aperture of 0.85.
  • This optical head has a built-in beam expander that is placed between the light source and the objective lens. By changing the distance between the two lenses that make up this beam expander, spherical aberration is reduced. Will be corrected.
  • the optical head is set so that focus servo is performed on the reflective film 102 in a state where the thickness of the cover layer 103 is 100 xm, that is, when the base material thickness is 100 ⁇ m.
  • FIG. 3A is a waveform diagram of a reproduced signal obtained when the BCA of the disk A is reproduced
  • FIG. 3B is a waveform diagram of a reproduced signal obtained when the BCA of the disk B is reproduced. Since the spherical aberration of the optical head used for reproduction is set to be optimal at a substrate thickness of 100 / im, when the disk A is reproduced, the light is focused on the reflective film 102 to the minimum. It was.
  • the amount of reflected light was modulated by the pits recorded on the base of the BCA mark 104, and the pit information was reproduced as a large signal modulation in portions other than the BCA mark 104. Also, since the BC A mark 104 is recorded with a long mark length having a lower recording density than the pits, it is reproduced as a long low reflectance portion. For this reason, it was sufficiently detectable.
  • the base material of the disc B has a thickness of 70 ⁇ m, light cannot be narrowed down on the reflective film 102 due to spherical aberration, and the light is blurred on the reflective film 102 to increase the spot size. Become. As a result, the pits recorded on the base of the BCA mark 104 appear relatively small with respect to the spot size on the reflective film 102, and the number of pits entering the spot increases. The signal modulation degree of the pit became small.
  • the BC A mark 104 is recorded with a sufficiently long mark length, which has a lower recording density than the pit, so that even if the light is blurred, it is sufficient as a long low reflectance portion. It was detectable.
  • the BCA mark 104 can be detected even when the spherical aberration is not optimally corrected. For this reason, by recording the base material thickness information on the medium as the BCA mark 104, it is possible to detect the base material thickness information from the BCA mark 104 and set a spherical aberration correction value suitable for the medium. it can.
  • an operation for optimizing conditions such as spherical aberration, focus, and tilt is performed to optimize the reproduction quality of the recorded signal.
  • the time required to optimize spherical aberration is reduced by performing learning to optimize spherical aberration using the spherical aberration corrected using the corrected spherical aberration (corrected spherical aberration) as the initial value. it can
  • the BCA mark 104 can be recorded after forming the cover layer 103, the thickness of the cover layer 103 can be measured and the thickness can be processed into a BCA. Therefore, highly reliable substrate thickness information can be recorded. [0029] In the example shown above, but a thinner substrate thickness up to 75 beta m, it is possible to detect the BCA marks 104 even when the thinner. The BCA mark 104 can be detected even in a state where the cover layer 103 is not provided.
  • the thickness of the base material in the medium is controlled in order to suppress the occurrence of aberration with respect to the tilt of the optical information recording medium. Is designed to be thin.
  • the thickness of the base material is reduced in this manner, a problem occurs in that the influence of the spherical aberration generated by the change in the thickness of the base material increases, and thus it is necessary to correct the spherical aberration. Therefore, applying the configuration of the present invention to a system such as a BD in which the numerical aperture of the lens is 0.85 and the thickness (base material thickness) of the force bar layer is S100 ⁇ m is particularly important. It is valid.
  • the present invention is not limited to this, and is applicable to a recordable write-once or rewritable optical information recording medium.
  • the same effect can be obtained by recording the substrate thickness information on the information recording layer using a means such as a BCA mark.
  • the base material thickness information is recorded as a barcode mark in the BCA, but is not limited to this, and may be recorded in another area of the information recording layer.
  • the mark shape is not limited to this, and may be another shape. At this time, it is preferable to record the base material thickness information using a mark shape that is lower than the recording density of other information recorded on the optical information recording medium.
  • the area for recording the base material thickness information is not limited to the information recording layer.
  • the place is not limited. Not limited.
  • an optical information recording medium having a single-layer structure provided with only one information recording layer has been described.
  • an optical information recording medium having a multilayer structure provided with a plurality of information recording layers has been described. It may be your body.
  • the thickness of the base material information is recorded in the information recording layer located closest to the light incident side or the information recording layer located closest to the opposite light incident side. It is preferably recorded. Further, the substrate thickness information recorded at this time is recorded from the light incident surface of the medium. Desirably, the distance to the surface of the information recording layer.
  • FIG. 4 is a block diagram showing a main configuration of the information recording / reproducing apparatus of the present embodiment.
  • the optical information recording medium 201 set in the information recording / reproducing apparatus shown in FIG. 4 has the same configuration as the optical information recording medium described in the first embodiment.
  • the information recording / reproducing apparatus includes a spin-doner motor 202 for rotating a set optical information recording medium 201, and a semiconductor laser.
  • An optical head (reproducing means) 203 for recording information by condensing the information on the layer and obtaining a reproduction signal from the reflected light; a moving mechanism 204 for moving the optical head 203 in the radial direction of the optical information recording medium 201;
  • a focus control circuit 205 for controlling the optical head 203 based on a focus error signal generated from the reproduction signal, and a tracking control circuit for controlling the optical head 203 based on a tracking error signal generated from the reproduction signal 206, a reproduction signal processing unit 207 for processing an information reproduction signal included in the reproduction signal, and a correction value storage unit (correction value storage means) 208 for storing a spherical aberration correction value set according to the thickness of the base material.
  • a system control unit (correction value determination unit) 209 that determines a correction value of spherical aberration using a correction value storage unit 208 from base material thickness information obtained when the BCA of the optical information recording medium 201 is reproduced;
  • a spherical aberration control circuit (spherical aberration correcting means) 210 for correcting the spherical aberration of the optical head 203 based on the correction value determined by the control unit 209.
  • the spherical aberration control circuit 210 also controls the spherical aberration of the optical head 203 at the time of learning to optimize the spherical aberration using the spherical aberration corrected based on the base material thickness information as an initial value.
  • the system control unit 209 has a function as a correction value determining unit for determining correction of spherical aberration, and further includes an entire system including an optical head 203, a focus control circuit 205, a tracking control circuit 206, and a spherical aberration control circuit 210. Is controlling.
  • the optical information recording medium 201 is irradiated with a laser beam for information reproduction by the optical head 203.
  • the BCA of the optical information recording medium 201 is focused and irradiated with a laser beam to read out the substrate thickness information.
  • the reading of the base material thickness information is performed by processing the information reproduction signal obtained from the reflected light from the optical information recording medium 201 by the optical head 203 in the reproduction signal processing unit 207, and converting the obtained base material thickness information signal into a system. This is performed by taking it into the control unit 209.
  • a correction value of the spherical aberration according to the thickness of the base material is determined.
  • the system control unit 209 determines the correction value of the spherical aberration based on the obtained base material thickness information using the correction value storage unit 208 in which the relationship between the base material thickness and the correction value of the spherical aberration is stored. Information on the determined correction value is taken into the spherical aberration control circuit 210.
  • the spherical aberration control circuit 210 corrects the spherical aberration of the optical head 203 based on the determined spherical aberration correction value.
  • learning for optimizing the spherical aberration is performed using the corrected spherical aberration as an initial value.
  • the learning is performed, for example, as follows.
  • the correction value of the spherical aberration is changed based on the information reproduction signal obtained from the reflected light from the optical information recording medium 201, A correction value that maximizes the information reproduction signal amplitude is searched for. Further, the jitter (fluctuation) of the information reproduction signal is detected, and the correction value is finely adjusted so as to minimize the jitter.
  • a tracking signal may be used instead of the information reproduction signal.
  • the time required for correcting spherical aberration can be reduced.
  • the optical information recording medium and the information recording / reproducing apparatus provide a high-density recording such as a BD in which recording / reproducing is performed using a lens having a thin base material and a high numerical aperture.
  • the present invention can be effectively applied to a medium or an information recording / reproducing apparatus for recording / reproducing information on / from such a high-density recording medium.

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

Abstract

La présente invention a trait à un support d'enregistrement d'information optique caractérisé en ce que le support comporte une couche d'enregistrement d'information apte à la reproduction d'information par l'irradiation lumineuse et une unité d'enregistrement d'information d'épaisseur de substrat contenant une information d'épaisseur de substrat. L'information d'épaisseur de substrat est une distance depuis la surface incidente de la lumière du support jusqu'à la surface de la couche d'enregistrement d'information. Lorsque, par exemple, le support d'enregistrement d'information optique est un disque spécialisé pour la reproduction, une couche mince de réflexion (102) est disposée sous la forme d'une couche d'enregistrement d'information. L'épaisseur de substrat est une distance depuis la couche de revêtement (103) en tant que surface incidente de lumière jusqu'à la surface du film mince de réflexion (102) en tant que couche d'enregistrement d'information. Une zone d'inscription de code (BCA) disposée dans la circonférence intérieure du support d'enregistrement d'information optique est utilisée en tant qu'une information d'épaisseur de substrat où l'information d'épaisseur de substrat est enregistrée au moyen de la marque de zone d'inscription de code (104) qui est inscrite sous la forme d'une marque de code à barres. Une telle information d'épaisseur de substrat est enregistrée avec une densité d'enregistrement inférieure à l'autre information.
PCT/JP2005/002769 2004-02-23 2005-02-22 Support d'enregistrement d'information optique et dispositif d'enregistrement/de reproduction optique WO2005081241A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004045878A JP2007213624A (ja) 2004-02-23 2004-02-23 光情報記録媒体と情報記録再生装置
JP2004-045878 2004-02-23

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WO2005081241A1 true WO2005081241A1 (fr) 2005-09-01

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TW (1) TW200529210A (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068750A1 (fr) * 2006-12-04 2008-06-12 Mempile Inc. Protection de données dans un support de données optique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05151644A (ja) * 1991-06-04 1993-06-18 Internatl Business Mach Corp <Ibm> 光学的データ記憶媒体
JPH08321065A (ja) * 1995-05-23 1996-12-03 Hitachi Ltd 光ディスク装置
JP2002157750A (ja) * 2000-09-06 2002-05-31 Matsushita Electric Ind Co Ltd 光ディスク装置及び情報の記録再生方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05151644A (ja) * 1991-06-04 1993-06-18 Internatl Business Mach Corp <Ibm> 光学的データ記憶媒体
JPH08321065A (ja) * 1995-05-23 1996-12-03 Hitachi Ltd 光ディスク装置
JP2002157750A (ja) * 2000-09-06 2002-05-31 Matsushita Electric Ind Co Ltd 光ディスク装置及び情報の記録再生方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068750A1 (fr) * 2006-12-04 2008-06-12 Mempile Inc. Protection de données dans un support de données optique

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JP2007213624A (ja) 2007-08-23

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