US20080310280A1 - Information recording medium and disk apparatus using the medium - Google Patents

Information recording medium and disk apparatus using the medium Download PDF

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US20080310280A1
US20080310280A1 US12/140,549 US14054908A US2008310280A1 US 20080310280 A1 US20080310280 A1 US 20080310280A1 US 14054908 A US14054908 A US 14054908A US 2008310280 A1 US2008310280 A1 US 2008310280A1
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Prior art keywords
group
recording
information
light
ring
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Kazuyo Umezawa
Seiji Morita
Koji Takazawa
Naomasa Nakamura
Naoki Morishita
Shinichi Katsuda
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Toshiba Corp
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Assigned to KABUSHIKI KAISHA TOSHIBA reassignment KABUSHIKI KAISHA TOSHIBA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATSUDA, SHINICHI, MORISHITA, NAOKI, MORITA, SEIJI, NAKAMURA, NAOMASA, TAKAZAWA, KOJI, UMEZAWA, KAZUYO
Publication of US20080310280A1 publication Critical patent/US20080310280A1/en
Priority to US12/795,385 priority Critical patent/US8059523B2/en
Priority to US13/252,791 priority patent/US8437242B2/en
Priority to US13/252,806 priority patent/US8422353B2/en
Abandoned legal-status Critical Current

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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
    • G11B7/244—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 organic materials only
    • G11B7/246—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 organic materials only containing dyes
    • G11B7/2467—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 organic materials only containing dyes azo-dyes
    • 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
    • G11B7/244—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 organic materials only
    • G11B7/249—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 organic materials only containing organometallic compounds
    • G11B7/2492—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 organic materials only containing organometallic compounds neutral compounds
    • 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
    • G11B7/244—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 organic materials only
    • G11B7/249—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 organic materials only containing organometallic compounds
    • G11B7/2495—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 organic materials only containing organometallic compounds as anions

Definitions

  • One embodiment of the present invention relates to an information recording medium capable of recording and reproducing information by using a short-wavelength laser beam such as a blue laser beam and, more particularly, to a write-once information recording medium, an information recording medium capable of recording information in multiple layers, and a disk apparatus using the information recording medium.
  • Optical disks are roughly classified into three types of disks, i.e., a ROM disk for playback only, a write-once R disk, and a rewritable RW or RAM disk.
  • a ROM disk for playback only
  • a write-once R disk for playback only
  • a rewritable RW or RAM disk As the volume of information increases, optical disks are being required to have large capacities and high transfer rates.
  • a DVD-R disk having two recoding layers instead of a normal single recording layer is being developed in order to increase the capacity even when using a recording system using the same laser wavelength.
  • an optical disk called an HD DVD has been developed.
  • the data capacity of one side of an HD DVD-ROM or HD DVD-R is 15 GB that is three times or more the data capacity of the conventional DVD, i.e., 4.7 GB.
  • An organic dye material is used in a recording layer of this HD DVD-R as described in, e.g., Jpn. Pat. Appln. KOKAI Publication Nos. 2006-205683 and 2005-271587.
  • FIG. 2 is a view for explaining an example of the arrangement of an optical disk according to an embodiment of the present invention
  • FIG. 3 is a view showing examples of organic dye materials usable as an L-to-H organic dye layer
  • FIGS. 4A to 4C are graphs each showing the relationship between the laser beam wavelength and absorbance for a predetermined dye
  • FIGS. 5A and 5B are graphs each showing the relationship between the laser beam wavelength and absorbance for a predetermined dye
  • FIG. 6 is a timing chart showing a method of recording rewritable data on a write-once information storage medium according to the first embodiment.
  • FIG. 7 is a block diagram showing an outline of the arrangement of an optical disk apparatus for playing back an optical disk.
  • an information recording medium having a plurality of recording layers and capable of recording and reproducing information by emitting a semiconductor laser of 450 nm or less to the recording layer, and a disk apparatus using the information recording medium, wherein when reproducing recorded information by detecting light reflected by the recording layer by using a light-detecting mechanism, letting x be the frequency of repetitive recording of a shortest mark length and shortest space length of the information, the ratio of the value of a highest level to the value of a level at x/190 of a sum signal detected by the light-detecting mechanism is lower than 32 dB, or the ratio of the average value of the amplitudes of signals of repetitive recording of the shortest mark length and shortest space length to the value of the highest level of the sum signal of the detected signals is higher than 10 dB, within a frequency range represented by x/3240 to x/190.
  • recording and reproduction can be well performed from the inner circumference to the outer circumference of an information recording medium having multiple recording layers in which recording and reproduction are performed by using a wavelength of 450 nm or less.
  • the present inventors made extensive studies to solve the problem of signal characteristic deterioration in the prior art described above, and have found that low-frequency noise has a large influence on the recording characteristics particular in the outer circumference.
  • the double of the shortest mark length is the length of one cycle of a repetitive recording pattern of the shortest mark and shortest space.
  • the frequency is 5 to 85 kHz.
  • the reflected light of a reproducing laser beam is measured using a spectrum analyzer.
  • the spectrum analyzer was set such that the RBW (Resolution Band Width) was 1 kHz, and the VBW (Video Band Width) was 1 kHz, waveforms were input 64 times and averaged.
  • the conditions were that a value at 85 kHz was the noise level, a peak value between 5 kHz and 85 kHz was the carrier level, and the C/N was (carrier level—noise level).
  • a carrier level Cst of the pattern of the shortest mark length and shortest space length indicates the average value of the amplitudes of reproduction signals of repetitive recording of the shortest mark length and shortest space length
  • the Cst/C is the ratio of the Cst to a peak value C between 5 kHz and 85 kHz.
  • the other embodiment can make the Cst/C higher than 10 dB. If the Cst/C is equal to or lower than 10 dB, the error rate characteristic of a recording signal often deteriorates.
  • the L1 recording layer is the second recording layer from the laser beam incident side.
  • FIG. 2 is a view for explaining an example of the arrangement of a write-once, single-sided, double-layered optical disk 100 as an example of the optical disk according to an embodiment of the present invention.
  • the optical disk 100 has a disk-like transparent resin substrate 101 made of a synthetic resin material such as polycarbonate (PC).
  • the transparent resin substrate 101 has concentric grooves or a spiral groove.
  • the transparent resin substrate 101 can be manufactured by injection molding by using a stamper.
  • a 0.59-mm thick transparent resin substrate (or dummy substrate) 102 is laminated on the substrate on which the L0 and L1 recording layers are stacked, with an UV-curing resin (adhesive layer) 103 interposed between the two substrates.
  • the organic dye recording layers 105 and 107 form a two-layered structure in which the semi-transmitting reflecting layer 106 and interlayer 104 are sandwiched.
  • the total thickness of the laminated optical disk thus obtained is about 1.2 mm.
  • a spiral groove having, e.g., a track pitch of 0.4 ⁇ m and a depth of 60 nm is formed (in each of the L0 and L1 layers) on the transparent resin substrate 101 or photopolymer 104 .
  • This groove wobbles, and address information is recorded on the wobble.
  • the recording layers 105 and 107 containing an organic dye are formed on the transparent resin substrate 101 or photopolymer 104 so as to fill the groove.
  • the organic dye forming the recording layers 105 and 107 it is possible to use an organic dye having a maximum absorption wavelength region shifted to wavelengths longer than the recording wavelength (e.g., 405 nm). Also, the organic dye is designed so as not to extinguish absorption in the recording wavelength region but to have a considerable light absorption in the long-wavelength region (e.g., 450 to 600 nm).
  • the above-mentioned organic dye (practical examples will be described later) can be easily applied in the form of a liquid onto the surface of the transparent resin substrate by spin coating.
  • the film thickness can be accurately controlled by controlling the ratio of dilution by the solvent and the rotational speed of spin coating.
  • the light reflectance is low when focusing or tracking is performed on tracks by a recording laser beam before information is recorded. After that, the light reflectance of a recording mark portion rises because the laser beam causes a decomposition reaction of the dye and the light absorbance decreases. This achieves a so-called, Low-to-High (or L-to-H) characteristic by which the light reflectance of a recording mark portion formed by emitting the laser beam is higher than that before the laser beam is emitted.
  • L-to-H Low-to-High
  • an example of a physical format applied to the L0 and L1 layers existing on the transparent resin substrate 101 and photopolymer (2P resin) 104 is as follows. That is, general parameters of the write-once, single-sided, double-layered disk are almost the same as those of a single-layered disk, except that the recording capacity usable by a user is 30 GB, the inner diameter of a data area is 24.6 mm in layer 0 (the L0 layer) and 24.7 mm in layer 1 (the L1 layer), and the outer diameter of the data area is 58.1 mm (in both layers 0 and 1).
  • a system lead-in area SLA includes a control data section as indicated by (c) in FIG. 2 .
  • This control data section includes parameters concerning recording, such as the recording power (peak power) and bias power, as a part of physical format information and the like, for each of L0 and L1.
  • mark/space recording is performed on tracks in a data area DA of the optical disk 100 by a laser having a predetermined recording power (peak power) and bias power.
  • this mark/space recording records object data (e.g., VOB) of a high-resolution TV broadcasting problem or the like and management information (VMG) of the object data on the tracks (of L0 and/or L1) in the data area DA.
  • object data e.g., VOB
  • VMG management information
  • the Low-to-High (or L-to-H) organic dye usable in the embodiment of the present invention it is possible to use an organic dye including a dye portion and counterion (anion) portion, or an organic metal complex.
  • the dye portion it is possible to use, e.g., a cyanine dye, styryl dye, porphyrin dye, or azo dye.
  • a cyanine dye, styryl dye, and azo dye are particularly suitable because the absorptance to the recording wavelength is readily controllable.
  • the maximum absorption and the absorbance in the recording wavelength region (400 to 405 nm) can be easily adjusted to nearly 0.3 to 0.5, preferably, nearly 0.4. This makes it possible to improve the recording/reproduction characteristics, and well design both the light reflectance and recording sensitivity.
  • the anion portion of the organic dye is preferably an organic metal complex from the viewpoint of the optical stability as well.
  • An organic metal complex containing cobalt or nickel as its central metal particularly has a high optical stability.
  • An azo metal complex or the like can be used as the organic metal complex.
  • the azo metal complex has a high solubility when 2,2,3,3-tetrafluoro-1-propanol (TFP) is used as a solvent. This facilitates the preparation of a solution for spin coating. In addition, since the solution can be recycled after spin coating, the manufacturing cost of the information recording medium can be reduced.
  • ligands surrounding the central metal can be used as ligands surrounding the central metal.
  • examples are dyes represented by formulas (D1) to (D6) below. It is also possible to form another structure by combining these ligands.
  • FIG. 3 shows four examples of dyes A to D as organic dye materials usable as the L-to-H organic dye layer usable in the present invention.
  • the dye A has a styryl dye as a dye portion (cation portion) and azo metal complex 1 as an anion portion.
  • the dye C has a styryl dye as a dye portion (cation portion) and azo metal complex 2 as an anion portion.
  • the dye D has a monomethinecyanine dye as a dye portion (cation portion) and azo metal complex 1 as an anion portion. Note that an organic metal complex can also be used singly.
  • the dye B is a nickel complex dye.
  • Formula (E1) below indicates the formula of the styryl dye as the dye portions of the dyes A and C.
  • Formula (E2) below indicates the formula of the azo metal complex as the anion portions of the dyes A and C.
  • Formula (E3) below indicates the formula of the monomethinecyanine dye as the dye portion of the dye D.
  • Formula (E4) below indicates the formula of the azo metal complex as the anion portion of the dye D.
  • Z 3 represents an aromatic ring, and this aromatic ring may have a substituent group.
  • Y 31 represents a carbon atom or hetero atom.
  • R 31 , R 32 , and R 33 represent the same aliphatic hydrocarbon group or different aliphatic hydrocarbon groups, and these aliphatic hydrocarbon groups may have a substituent group.
  • R 34 and R 35 each independently represent a hydrogen atom or appropriate substituent group. When Y 31 is a hetero atom, one or both of R 34 and R 35 do not exist.
  • Z 1 and Z 2 represent the same aromatic ring or different aromatic rings, and these aromatic rings may have a substituent group.
  • Y 11 and Y 12 each independently represent a carbon atom or hetero atom.
  • R 11 and R 12 represent aliphatic hydrocarbon groups, and these aliphatic hydrocarbon groups may have a substituent group.
  • R 13 , R 14 , R 15 , and R 16 each independently represent a hydrogen atom or appropriate substituent group. When Y 11 and Y 12 are hetero atoms, some or all of R 13 , R 14 , R 15 , and R 16 do not exist.
  • Examples of the cyclic nuclei are an imidazoline ring, imidazole ring, benzoimidazole ring, ⁇ -naphthoimidazole ring, ⁇ -naphthoimidazole ring, indole ring, isoindole ring, indolenine ring, isoindolenine ring, benzoindolenine ring, pyridinoindolenine ring, oxazoline ring, oxazole ring, isoxazole ring, benzoxazole ring, pyridinoxazole ring, ⁇ -naphthoxazole ring, ⁇ -naphthoxazole ring, selenazoline ring, selenazole ring, benzoselenazole ring, ⁇ -naphthoselenazole ring, ⁇ -naphthoselenazo
  • Z 1 to Z 3 represent aromatic rings such as a benzene ring, naphthalene ring, pyridine ring, quinoline ring, and quinoxaline ring, and these aromatic rings may have one or a plurality of substituent groups.
  • substituent groups are aliphatic hydrocarbon groups such as a methyl group, trifluoromethyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, isopentyl group, neopentyl group, tert-pentyl group, 1-methylpentyl group, 2-methylpentyl group, hexyl group, isohexyl group, 5-methylhexyl group, heptyl group, and octyl group; alicyclic hydrocarbon groups such as a cyclopropyl group, cyclobutyl group, cyclopentyl group, and cyclohexyl group; aromatic hydrocarbon groups such as a phenyl group, biphenylyl group, o-tolyl group, m-tolyl group, p-tolyl group, x
  • R 13 to R 16 , R 34 , and R 35 in the formulas of the monomethinecyanine dye and styryl dye each independently represent a hydrogen atom or appropriate substituent group in the individual formulas.
  • substituent group are aliphatic hydrocarbon groups such as a methyl group, trifluoromethyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, isopentyl group, neopentyl group, tert-pentyl group, 1-methylpentyl group, 2-methylpentyl group, hexyl group, isohexyl group, 5-methylhexyl group, heptyl group, and octyl group; ether groups such as a methoxy group, trifluoromethoxy group, ethoxy group, propoxy group, butoxy group, tert-but
  • an azo compound forming the azo-based organic metal complex represented by the formula can be obtained in accordance with the conventional method by reacting diazonium salt having R 21 and R 22 or R 23 and R 24 corresponding to the formula with a heterocyclic compound having an active methylene group adjacent to a carbonyl group in a molecule.
  • the heterocyclic compound are an isooxazolone compound, oxazolone compound, thionaphthen compound, pyrazolone compound, barbituric acid compound, hydantoin compound, and rhodamine compound.
  • Y 21 and Y 22 represent hetero atoms which are the same or different and selected from group-XVI elements in the periodic table, e.g., an oxygen atom, sulfur atom, selenium atom, and tellurium atom.
  • FIG. 5A shows the change in absorbance of the dye D to the wavelength of an emitted laser beam.
  • FIG. 5B shows the change in absorbance of the anion portion of the dye D to the wavelength of an emitted laser beam.
  • the contrast and resolution of a recording mark can be kept high even against heat. This facilitates recording sensitivity design.
  • the light-reflecting layer was coated with a UV-curing resin by spin coating, and a transparent resin substrate 102 having a thickness of 0.60 mm was laminated on the UV-curing resin, thereby obtaining a single-sided, double-layered, write-once information recording medium.
  • the apparatus used for evaluation is optical disc evaluation apparatus ODU-1000 manufactured by Pulstec Industrial Co., Ltd. This apparatus has a laser wavelength of 405 nm and NA of 0.65. The linear velocity in recording and reproduction is selected to be 6.61 m/s.
  • a recording signal is 8-12 modulated random data, and information is recorded by using a laser waveform containing a given recording power and two bias powers 1 and 2 as shown in FIG. 6 .
  • the recording conditions applied to the evaluation are as follows.
  • the exposure levels at the time of recording have four levels of recording power (peak power), bias power 1 , bias power 2 , and bias power 3 .
  • peak power When long (4 T or more) recording mark 9 is formed, modulation is carried out in the form of multi-pulses between recording power (peak power) and bias power 3 .
  • a minimum mark length relevant to channel bit length T is obtained as 2 T. In the case where the minimum mark of 2 T is recorded, one write pulse of the recording power (peak power) level after bias power 1 is used as shown in FIG.
  • bias power 2 is temporarily obtained immediately after the write pulse.
  • bias power 2 is temporarily used after exposing two write pulses, a first pulse and a last pulse of recording power (peak power) level that follows bias power 1 .
  • bias power 2 is used after the exposure is made with multi-pulse and write pulse.
  • the vertical dashed line in FIG. 6 shows a channel clock cycle.
  • the laser power is raised at a position delayed by TSFP from the clock edge, and fallen at a position delayed by TELP from the one-clock passing portion.
  • the just-subsequent cycle during which the laser power is set at bias power 2 is defined as TLC.
  • Values of TSFP, TELP, and TLC are recorded in physical format information PFI contained in control data zone CDZ in the case of the H format.
  • the laser power is risen at a position delayed by TSFP from the clock edge, and lastly, ended with a last pulse. Immediately after the last pulse, the laser power is kept at bias power 2 during the period of TLC. Shift times from the clock edge to the rise/fall timing of the last pulse are defined as TSLP, TELP. In addition, a shift time from the clock edge to the fall timing of the last pulse is defined as TEFP, and further, an interval of a single pulse of the multi-pulse is defined as TMP.
  • Each of intervals TELP-TSFP, TMP, TELP-TSLP, and TLC is defined as a half-value wide relevant to the maximum value.
  • the above parameter setting ranges are defined as follows:
  • the values of the above described parameters can be changed or modified according to the recording mark length (Mark Length) and the immediately preceding/immediately succeeding space length (Leading/Trailing space length).
  • the shortest mark length is 0.204 ⁇ m
  • the disk rotational linear velocity is 6.61 m/s. Therefore, the frequency of the repetitive pattern of the shortest mark and shortest space is 16.2 MHz. When this frequency is substituted into x of
  • the range to be measured by a spectrum analyzer is 5 to 85 kHz.
  • the N level was ⁇ 89.8 dBrm at 85 kHz, and the highest level (C level) was ⁇ 66.7 dBm.
  • the PRSNR was 18.7 in the inner circumference of L0, 17.6 in the outer circumference of L0, 23.1 in the inner circumference of L1, and 17.0 in the outer circumference of L1. That is, it was possible to obtain favorable recording characteristics from the inner circumference to the outer circumference.
  • the carrier level (Cst) measured by the spectrum analyzer was ⁇ 43.5 dB.
  • the Cst/C was 23.2 dB.
  • the carrier level (Cst) indicates the average value of the amplitudes of reproduction signals obtained when 2 T was repetitively recorded with the optimum recording power and then reproduced.
  • An information recording medium was manufactured following the same procedures as in the example, and information was recorded. Within the range of 5 to 85 kHz, the N level was ⁇ 89.0 dBm at 85 kHz, and the C level was ⁇ 49.7 dBm. From the results, the C/N was 39.3 dB.
  • the PRSNR was 20.9 in the inner circumference of L0, 19.8 in the outer circumference of L0, 21.2 in the inner circumference of L1, and 11.4 in the outer circumference of L1. That is, it was possible to obtain favorable recording characteristics in the inner circumferences of L0 and L1, but the characteristics deteriorated in the outer circumferences.
  • the present invention can simply evaluate a medium in which the characteristics deteriorate by the method as described above, and can select only a medium by which good signal characteristics can be obtained from the inner circumference to the outer circumference.
  • the present invention is not limited to the above example and, when carried out at present or in the future, can be variously modified without departing from the spirit and scope of the invention on the basis of techniques usable at that time.
  • the present invention can also be carried out not only on a double-layered disk but also on an optical disk having three or more recording layers that will be put into practical use in the future.
  • optical disk apparatus for reproducing information recorded on the above-mentioned optical disk will be explained below.
  • FIG. 7 is a block diagram showing an outline of the arrangement of the optical disk apparatus for playing back an optical disk.
  • an optical disk is, e.g., the single-sided, double-layered optical disk shown in FIG. 2 .
  • a short-wavelength semiconductor laser source 120 is used as the light source.
  • the wavelength of the exit beam is in, e.g., a violet wavelength band of 400 to 410 nm.
  • An exit beam 110 from the semiconductor laser source 120 is collimated into a parallel beam by a collimating lens 121 , and enters an objective lens 124 through a polarizing beam splitter 122 and ⁇ /4 plate 123 . After that, the beam 110 is focused on each information recording layer through the substrate of the optical disk D.
  • Reflected light 111 from the information recording layer of the optical disk D is transmitted through the substrate of the optical disk D again, and reflected by the polarizing beam splitter 122 through the objective lens 124 and ⁇ /4 plate 123 . After that, the reflected light 111 enters a light-detecting mechanism through a condenser lens 125 .
  • the light-detecting mechanism includes a photodetector 127 and an I/V amplifier (current-to-voltage converter) that is not shown.
  • a light-receiving portion of the photodetector 127 is normally divided into a plurality of portions, and each light-receiving portion outputs an electric current corresponding to the light intensity.
  • the I/V amplifier (current-to-voltage converter) converts the output electric current into a voltage, and applies the voltage to an arithmetic circuit 140 .
  • the arithmetic circuit 140 calculates, e.g., a tilt error signal, HF signal, focusing error signal, and tracking error signal from the input voltage signal.
  • the tilt error signal is used to perform tilt control.
  • the HF signal is used to reproduce information recorded on the optical disk D.
  • a sum signal used in the present invention is this HF signal.
  • the focusing error signal is used to perform focusing control.
  • the tracking error signal is used to perform tracking control.
  • An actuator 128 can drive the objective lens 124 in the vertical direction, disk radial direction, and tilt direction (the radial direction or/and tangential direction).
  • a servo driver 150 controls the actuator 128 so that the objective lens 124 follows information tracks on the optical disk D.
  • tilt directions there are two different tilt directions. One is “a radial tilt” that occurs when the disk surface inclines toward the center of an optical disk. The other is “a tangential tilt” that occurs in the tangential direction of a track. A tilt that generally occurs owing to the warpage of a disk is the radial tilt. It is necessary to take account of not only a tilt that occurs during the manufacture of a disk but also a tilt that occurs owing to a change with time or a rapid change in use environment.
  • the optical disk of the present invention can be played back by using the optical disk apparatus like this.
  • the individual embodiments may also be appropriately combined as much as possible when practiced. In this case, the combined effects can be obtained.
  • these embodiments include inventions in various stages, so various inventions can be extracted by properly combining a plurality of disclosed constituent elements. For example, even when some of all the constituent elements disclosed in the embodiments are deleted, an arrangement from which these constituent elements are deleted can be extracted as an invention.

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  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
US12/140,549 2007-06-18 2008-06-17 Information recording medium and disk apparatus using the medium Abandoned US20080310280A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US12/795,385 US8059523B2 (en) 2007-06-18 2010-06-07 Optical recording medium for writing data using multiple pulses
US13/252,791 US8437242B2 (en) 2007-06-18 2011-10-04 Optical recording medium for writing data using multiple pulses
US13/252,806 US8422353B2 (en) 2007-06-18 2011-10-04 Optical recording medium for writing data using multiple pulses

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JP2007160307A JP2008310922A (ja) 2007-06-18 2007-06-18 情報記録媒体及びこの媒体を用いたディスク装置
JP2007-160307 2007-06-18

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US13/252,791 Active US8437242B2 (en) 2007-06-18 2011-10-04 Optical recording medium for writing data using multiple pulses
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US13/252,806 Active US8422353B2 (en) 2007-06-18 2011-10-04 Optical recording medium for writing data using multiple pulses

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CN101930769B (zh) 2014-06-18
US8059523B2 (en) 2011-11-15
US20120026851A1 (en) 2012-02-02
US8422353B2 (en) 2013-04-16
US20100246366A1 (en) 2010-09-30
CN101329882A (zh) 2008-12-24
US8437242B2 (en) 2013-05-07
JP2008310922A (ja) 2008-12-25
CN101930769A (zh) 2010-12-29
US20120026854A1 (en) 2012-02-02

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