WO2002058057A1 - Support d'enregistrement optique, matrice de support d'enregistrement optique, appareil de fabrication de support d'enregistrement optique et appareil de reproduction/enregistrement optique - Google Patents
Support d'enregistrement optique, matrice de support d'enregistrement optique, appareil de fabrication de support d'enregistrement optique et appareil de reproduction/enregistrement optique Download PDFInfo
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- WO2002058057A1 WO2002058057A1 PCT/JP2002/000331 JP0200331W WO02058057A1 WO 2002058057 A1 WO2002058057 A1 WO 2002058057A1 JP 0200331 W JP0200331 W JP 0200331W WO 02058057 A1 WO02058057 A1 WO 02058057A1
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- Prior art keywords
- optical recording
- group
- recording medium
- amplitude
- groove
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
- G11B7/24082—Meandering
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
- G11B11/10578—Servo format, e.g. prepits, guide tracks, pilot signals
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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
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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
- G11B7/00718—Groove and land recording, i.e. user data recorded both in the grooves and on the lands
-
- 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
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming
Definitions
- Optical recording medium master for optical recording medium
- manufacturing device for optical recording medium master manufacturing device for optical recording medium master
- the present invention relates to an optical recording medium, an optical recording medium master, an optical recording medium master manufacturing apparatus, and an optical recording / reproducing apparatus.
- the optical recording medium is for recording various signalized information in an optically reproducible manner.
- compact discs, laser discs, etc. have an embossing head corresponding to data, which is pre-formed on a disc substrate, and are read-only optical discs, and mini discs (Mini Discs: MD), etc.
- Information (data) using the phase change of the recording layer such as a magneto-optical disk set to record or reproduce data using the effect, or a DVD (Digital Versatile Disk).
- phase change optical disk set to perform recording and reproduction of data.
- a continuous groove-shaped group is formed on a recording track instead of a discrete shape such as a pit. It is formed along.
- This group is a guide groove provided mainly for tracking support control. The area between the groups is called a land because it rises closer to the surface than the bottom of the group.
- tracking support control is performed using a push-pull signal.
- the push-pull signal irradiates the optical recording medium with a light beam, and detects the light reflected from the optical recording medium by two photodetectors symmetrically arranged with respect to the track center. It can be obtained based on the difference between the outputs from the photodetectors.
- the applicant's patent No. 2,960,018 discloses MD data recording.
- a method has been proposed in which a wobbling wide group, which is a part, is formed by a signal obtained by superposing 22.5 kHz and 5 MHz.
- the 22.5 kHz FM modulation signal is for recording address wobble information
- the 5 MHz signal is for expanding the group width depending on the amplitude. It is.
- the coupling wide dull valve is formed in a shape in which both side surfaces of the groove are warped (regularly meandering).
- the data recording section becomes a wide group (wide), which enables stable reproduction of the ADIP wobble signal and stable recording and reproduction of the M ⁇ signal. Can be realized.
- Patent No. 2 854 187 proposes a technology in which only one of the two side surfaces of the group is made to orbulate, and the other side is made straight (in an arc shape) without warping. Have been. According to this technology, it is possible to carry (include) the address information in the group's orbit.
- the wobble signal has a beep between adjacent warp rings, which makes it difficult to stably reproduce the wobble signal. There was a problem.
- the present invention has been made in view of such a problem, and has as its object the purpose of narrow track pitch. It is an object of the present invention to provide an optical recording medium capable of stably reproducing a table signal without generating a beat even if the recording density is increased by achieving a higher recording density. Also, an optical recording / reproducing apparatus used for recording / reproducing on / from the optical recording medium, an optical recording medium master used for duplicating the optical recording medium, and an apparatus for manufacturing the optical recording medium master are provided. It is in. Disclosure of the invention
- An optical recording medium or an optical recording medium master has an optical recording medium in which groups are formed on a surface of a substrate so as to form groove-shaped tracks, and information is set to be readable along the tracks of the groups.
- the above-mentioned group is a wobbling group provided so as to wobble both side surfaces of the groove with different amplitudes.
- a groove is formed on a surface of a substrate so as to form a groove-like track, and information is set to be readable along the track of the group.
- the above-mentioned group is a coupling group provided so that both sides of the groove are wobbled in the same phase with different amplitudes.
- An apparatus for manufacturing an optical recording medium master is an apparatus for manufacturing an optical recording medium master for patterning a groove forming a track on the surface of the master, and superimposing a low-frequency signal and a high-frequency signal.
- the light beam or laser beam for exposure is made to advance at a predetermined period in a direction intersecting the traveling direction while traveling relatively to the surface of the optical recording medium master.
- the latent images are formed so that both sides of the group are wobbled with different amplitudes and wobbled in phase.
- An optical recording / reproducing apparatus has a wobbling group in which wobble amplitudes on both sides of a groove are set to be different, and information can be recorded in both the wobbling group and the land.
- An optical recording / reproducing apparatus for recording and / or reproducing information on / from a set optical recording medium comprising: means for following a light spot to a warping group; And a means for detecting a wobble signal while following the signal.
- Another optical recording / reproducing apparatus has a wobbling group in which wobble amplitudes on both sides of a groove are set to be different, and information can be recorded on either the wobbling group or the land.
- An optical recording / reproducing apparatus that records and / or reproduces information on / from an optical recording medium that is set to have a certain shape. And a means for detecting a wobble signal while following the signal.
- the group is provided with a wobbling ring so as to wobble both side surfaces of the groove with different amplitudes.
- both sides of the groove which are movable with different amplitudes, are moved in the same direction in the track direction.
- Such different amplitudes on both sides are more preferably set to 3.3 to 40%.
- FIG. 1 is a diagram showing a schematic configuration of a magneto-optical disk according to an embodiment of the present invention.
- FIG. 2 is an enlarged view of a recording area formed on the surface of the magneto-optical disk shown in FIG.
- FIG. 3 is a diagram showing a schematic configuration of a laser cutting device for manufacturing a master for a magneto-optical disk according to an embodiment of the present invention.
- FIG. 4 is a diagram schematically showing an outline of an exposure method for forming wobbles having different amplitudes in the same phase on both side surfaces of the warping group.
- FIG. 5 is a diagram schematically showing a schematic configuration of a warping group obtained by the exposure method shown in FIG.
- Fig. 6 shows the jitter measured as a representative value of the recording and reproduction characteristics of the evaluation magneto-optical disk. JP02 / 00331
- FIG. 5 is a diagram showing measurement results. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a schematic configuration of a magneto-optical disk according to an embodiment of the present invention.
- This magneto-optical disc is a disc-shaped optical recording medium set to record and reproduce data by a magneto-optical effect according to the so-called MD3 format standard.
- the recording unit 3 includes, for example, a first dielectric film made of SiN (silicon nitride), a perpendicular magnetic recording film made of a TeFeCo alloy, and a first magnetic film made of SiN.
- the second dielectric film, the reflective film made of an A1 alloy, and the like are sequentially laminated.
- the protective layer 4 is formed on the recording section 3 by, for example, spin-coating an ultraviolet curable resin.
- the material for forming the recording section 3 and the protective layer 4 is not limited to the above example.
- the recording section 3 may be made of any material that can effectively perform magneto-optical recording, and the protective layer 4 can protect the recording section 3 effectively. It may be something like
- FIG. 2 is an enlarged view of a recording area formed on the surface of the magneto-optical disk. It is set so that data by magneto-optical recording can be written in the wobbling group 71 and the land 72 between the adjacent wobbling groups 71.
- the amplitude of one side is 15 nm
- the amplitude of the other side is, for example, 0. 5 nm, ⁇ 1.5 nm, ⁇ 3.0 nm, ⁇ 6.0 nm, and in-phase with a substantially constant period in the longitudinal direction of the groove of the warping ring 71 It is formed to wobble.
- the track pitch is set to, for example, 1.2 zm
- the width of the substantial writable area of each of the warping group 71 and the land 72 is set to about 0.60 m.
- the distance between the wobble centers of adjacent tracks is called a track pitch.
- the tracking servo is used.
- the setting is such that a push-pull signal of a sufficient level for control is obtained.
- the push-pull signal is obtained by detecting light reflected by irradiating a light beam to the magneto-optical disk by two photodetectors (not shown) A and B arranged symmetrically with respect to the track center. Then, it can be obtained based on the difference between the outputs SA and SB from the two photodetectors A and B (SA-SB).
- the amount of reflected light at this time can be detected based on the sum (S A + S B) of the outputs S A and S B from the two photodetectors A and B.
- Information on the detected amount of reflected light indicates the number of tracks when the light beam spot moves across the warp ring dull 71 across its width. This signal is used to detect whether a signal has crossed a signal, and is generally called a cross-track signal.
- both sides of the warping group 71 are provided so as to be capable of being in-phase with different amplitudes, and the address information is carried in the warping group 71 (added or added). Incorporation into the wobbling loop 71 increases the amount of the signal transmitted by 3.3% to 40% as compared with the case where only one side surface of the wobbling loop 71 is warped.
- the wobbles on both sides have the same phase, the amplitude of one is set to ⁇ 15 nm, and the amplitude of the other is set to an amplitude different from the maximum soil of 6.0 nm. 7 Even if both sides of 1 are made to warp, a sufficient signal amount can be obtained, and the beat generated in the wobbling signal when recording or reproducing information can be reduced or eliminated. It is possible to perform stable recording and reproduction.
- the master (a master for manufacturing an optical recording medium) is used.
- the master is manufactured by laser cutting as shown in FIG. Done by the device.
- This laser cutting apparatus exposes a photoresist 12 applied on a glass substrate 11 to form a latent image having a planar pattern such as a warping group 71.
- a glass substrate 11 coated with a photoresist 12 is placed on a turntable 17 of a rotary drive (not shown).
- the glass substrate 11 coated with the photoresist 12 is driven to rotate by the turntable 17 as shown by the arrow M in the figure, and the movable optical table 18 is parallel.
- the relative rotation speed (linear velocity) of the master using the turntable 17 with respect to the laser beam 30 at the time of this exposure is set to, for example, 0.91 mZs, and for each rotation, for example, A distance equivalent to the track pitch, such as 1. 20 zm, may be set so that the moving optical table 18 moves in parallel.
- a distance equivalent to the track pitch such as 1. 20 zm
- the absolute values of the rotation speed and the track pitch are not limited to these.
- a laser light source 13 for emitting laser light
- an E ⁇ M Electro Optical Modulator; electro-optic modulator for adjusting the intensity of the laser light emitted from the laser light source 13.
- the BS Beam Splitter
- the detector 15 placed in the detector, the PD (Photo Detector) 19 that receives the laser beam that has passed through the analyzer 15, and a signal electric field applied to the E 14M 14 EO
- An APC Auto Power Controller
- the laser light source 13 is desirably a material capable of emitting short-wavelength laser light, such as a Kr (cribton) laser having a wavelength ⁇ of 3551 nm.
- a Kr (cribton) laser having a wavelength ⁇ of 3551 nm.
- the present invention is not limited to this.
- the laser light emitted from the laser light source 13 is adjusted to a predetermined light intensity by the EOM 14 controlled and driven by the APC 20 and then enters the analyzer 15.
- the analyzer 15 is the S-polarized analyzer 15
- the laser light transmitted through the analyzer 15 becomes S-polarized light.
- the laser light emitted from the laser light source 13 and passing through the BS 16 and the analyzer 15 via the EOM 14 and traveling straight is received by the PD 19, and the light intensity is detected by the PD 19 .
- a signal carrying the light intensity information is transmitted from PD 19 to APC 20.
- the APC 20 Upon receiving the signal, the APC 20 inputs a control signal to the EOM 14 so that the intensity of the laser beam received by the PD 19 becomes constant, and adjusts the signal electric field. In this manner, the automatic light intensity control of the laser light source system can be performed so that the intensity of the laser light emitted from the EQM 14 becomes constant.
- the laser beam reflected by the BS 16 remains a parallel beam, and is further reflected by the reflection mirror 21 to change its direction.
- the moving optical table 18 includes an AOD 48, a drive circuit 50, a reflection mirror 22, a beam magnifying lens 55, and an objective lens 54.
- the AOD 48 includes one acoustic optical element 46 and edge prisms 47, 49 arranged before and after the acoustic optical element 46, and these are the grating surface of the acoustic optical element 46 and the edge prisms 47, 49 and 49. Are arranged so as to satisfy the Bragg diffraction condition and not to change the horizontal height of the optical axis.
- the acousto-optic device 46 can be preferably used tellurium oxide (Te_ ⁇ 2).
- the AOD 48 is controlled based on the DC signal supplied from the drive circuit 50, and is set to perform intensity modulation of the laser light.
- the driving circuit 50 is supplied with a high-frequency signal by the voltage frequency controller 51.
- a control signal is externally supplied to the voltage frequency controller 51.
- the control signal has, for example, a waveform in which a 5 MHz sine wave signal is superimposed on a 84.672 kHz frequency sine wave signal.
- the plane pattern of the warping group 71 is meandered by a sine wave of 2 kHz, and the groove width of the plane pattern of the warping group 71 is modulated by the amplitude of the sine wave of 5 MHz. spread.
- the AOD 48 is controlled by the control signal, the Bragg diffraction angle in the acousto-optic element 46 in the AOD 48 changes, and the laser beam 30 generates a warp ring that carries the address information. At this time, the laser beam 30 is focused on the master while controlling the spot to be constant.
- FIG. 4 schematically shows an outline of an exposure method for forming wobbles having different amplitudes in the same phase on both side surfaces of the wobbling group 71 as described above.
- FIG. 5 schematically shows a schematic configuration of the warping group 71 obtained thereby.
- the ratio of the amplitude of the envelope waveform between the positive side and the negative side of the high-frequency signal waveform is 2: 1. .
- the ratio of the amplitude of the envelope waveform is not limited to 2: 1 as described above.
- the modulation degree of the envelope waveform can be changed by variously changing the ratio of the two level data given to the D / A converter.
- one level data correspond to a negative voltage
- the negative phase is inverted with respect to the positive phase
- the wobbles on both sides of the coupling group 71 are made to have opposite phases. It is also possible to do. It is also possible to change the amplitude of the high-frequency signal by changing the DC offset voltage provided as an external reference voltage.
- the control signal formed as described above is input from the voltage frequency controller 51 to the drive circuit 50 as a signal corresponding to the exposure pattern when the photoresist 12 is exposed.
- the drive circuit 50 drives the AOD 48 to apply optical polarization to the laser beam 30 for exposing the photoresist 12, and the two sides as described above have different amplitudes.
- the planar pattern of the wobbling group 71 1 wobbled in phase can be exposed on the photoresist 12 of the master.
- the center frequency is 2 2 4
- a control signal obtained by superimposing a low-frequency signal FM-modulated to 84.672 kHz using a high-frequency signal of 5 MHz and a high-frequency signal of 5 MHz is applied to a voltage-frequency controller 5 1
- the drive circuit 50 Based on the input signal, the drive circuit 50 changes the black angle of the acousto-optic element 46 of the AOD 48 so that the laser beam 30 is acousto-optically polarized, and It is possible to expose patterns that are wobbled in phase with different amplitudes.
- the laser beam 30 acousto-optically polarized by the AOD 48 in this manner is adjusted to a predetermined beam spot diameter by the beam magnifying lens 55,
- the light is reflected by 22 and guided to the objective lens 54, and the objective lens 54 transfers the groove of the warping ring 71 onto the photoresist 12 on the master as schematically shown in FIG. Irradiation while shaking in a direction crossing the direction.
- a latent image is formed on the photoresist 12 on the master disc, which includes a pattern in which the amount of amplitude is different on both sides of one warping group 71 and which is wobbled in the same phase.
- one beam spot is periodically swung with different amplitudes based on a control signal obtained by superimposing a low-frequency signal and a high-frequency signal, so that wobbling with different amplitudes on both sides. Since the planar pattern of the group 7 1 is exposed, the wobble on both sides is the same as when exposing the tables on both sides of one coupling group 71 1 using separate beam spots. The wobbles on both sides can be reliably exposed to the same phase without any phase shift (or synchronization shift).
- the objective lens 54 preferably has a large NA (numerical aperture) so that a finer loop pattern can be formed with high precision. Specifically, an objective lens 54 having NA of 0.9 or more is preferable.
- the master is subsequently subjected to a development process to dissolve the exposed portion of the photoresist 12 and develop the photoresist.
- a development process to dissolve the exposed portion of the photoresist 12 and develop the photoresist.
- an undeveloped master is placed on a turntable of a developing machine (not shown), and the developing solution is dripped onto the surface of the master while rotating the turntable to develop the photoresist 12. Can be.
- a conductor film made of a nickel (Ni) thin film is formed on the concave / convex pattern of the photoresist 12 of the master using, for example, a non-electric field plating apparatus (not shown).
- a nickel plating layer of, for example, about 300 ⁇ 5 m is formed on the conductor film by an electric plating method.
- the nickel plating layer is peeled off from the master using a cutter or a peeling squeegee, and the photoresist 12 remaining on the surface on which the nickel plating layer has been formed is washed with a solvent such as acetone.
- a stamper (not shown) to be incorporated in an injection molding die or the like.
- minute irregularities such as a wobbling groove 71 formed on the surface of the master are transferred onto the surface of the base plate 1 by a photopolymer method (so-called 2P method).
- a photopolymer is applied flatly on the surface of the master on which the concavo-convex pattern is formed to form a photopolymer layer 7.
- a glass base plate 1 having a refractive index of 1.52 or less and a thickness of 1.2 mm, for example, is adhered onto the photopolymer layer 7 while preventing bubbles and dust from being mixed therein.
- the photopolymer layer 7 is cured by irradiating ultraviolet rays, and the photopolymer layer 7 is peeled off from the master together with the base plate 1, whereby minute irregularities on the surface of the master are transferred to the photopolymer layer 7. Can be formed.
- a recording unit 3 is formed on the recording surface of the disk substrate 2 as shown in the cross-sectional view of FIG. 1 on a recording surface of a silicon nitride (Si 3 N 4 ).
- Domain wall displacement detection film DWDD: Domain Wall Displacement Detection film
- TbFeCo alloy TbFeCo alloy
- DyFeCo alloy DyFeCo alloy
- GdFe alloy etc.
- a 2P resin is applied smoothly by, for example, a spin coating method or the like, and is cured by irradiation with a UV lamp to form a protective layer 4.
- a 2P resin is applied smoothly by, for example, a spin coating method or the like, and is cured by irradiation with a UV lamp to form a protective layer 4.
- the photopolymer method is used as a method for more accurately transferring the uneven pattern such as the warping group 71 formed on the master to the disk substrate 2 has been described.
- injection molding of a transparent resin such as polymethyl methacrylate-polycarbonate can also be used to form a disk with a surface with a concavo-convex pattern such as a warping group 71. It goes without saying that the substrate 2 can be manufactured.
- the material for forming various parts such as the base plate 1, the recording part 3, and the protective layer 4 of the magneto-optical disk is not limited to the above, and various other materials may be used. It can be used.
- a plurality of evaluation magneto-optical disks having various amounts of warping amplitude and the like were manufactured by the manufacturing method using the master as described above, and the recording / reproducing function of each was evaluated.
- the power of the exposure laser beam 30 was changed in various ways, and it was confirmed how the group width changed for each power. More specifically, the power of the exposure laser beam 30 is set to 0.9, 1.1, 1.45, and in each case, the groove of the warp ring group 71 of the formed master is set. The width was measured using an electron microscope. As a result, the groove width was 562 nm, 622 nm, and 682 nm, respectively, corresponding to the above power.
- the amplitude on one side was ⁇ 15 nm for all disks, and the amplitude on the other side was ⁇ 0.5 nm, ⁇ 1.5 nm, ⁇ 3.0 nm, ⁇ 6.0 nm And, it was made different for each disk.
- a disk substrate 2 is formed by the photopolymer method as described above, and a recording portion 3 and a protective layer 4 are formed on the surface of the disk substrate 2.
- a magnetic disk was manufactured.
- the wobbling group 71 is an evaluation magneto-optical disk having an amplitude of one side of 15 nm on one side and an amplitude of ⁇ 6.0 nm on the other side.
- the jitter was measured as a representative value (parameter) of, the results shown in Fig. 6 were obtained. That is, if the group width is 562 nm, The jitter in the land 72 was 10.5%, and that in the wobbling group 71 was 9.5%. Also, when the dull width was 62 2 nm, the jitter in the land 72 was 9.5%, and that in the warping group 71 was 8.5%.
- the jitter in the land 72 was 10.0%, and that in the warping group 71 was 8.5%.
- the recording and reproducing characteristics were sufficiently stable. If the amplitude on the other side is less than ⁇ 6.0 nm, it is expected that more stable recording / reproducing characteristics will be obtained theoretically, but actually the jitter is measured as a representative value. It was confirmed that the obtained recording / reproducing characteristics became more stable. According to this experimental result, while the amplitude of one side of the warping group 71 is a constant ⁇ 15 nm, the amplitude of the other side is minimum 0.5 nm to maximum 6.0 O.
- the technique of the present invention can be widely applied to an optical recording medium that can be formed so that the wobble amplitude is different on both side surfaces of the groove, its master, a method of manufacturing the same, and an optical recording apparatus.
- a rewritable optical recording medium that is set so that data can be rewritten many times
- a write-once optical recording medium that is set so that additional recording is possible but erasing is not possible
- the present invention is applicable to a read-only optical recording medium in which data is written in a non-rewritable manner.
- the data recording method is a read-only method, a magneto-optical method that records and reproduces data using a magneto-optical effect, or a data recording and reproducing method using a phase change of a recording layer. Any recording method, such as the phase change method that performs the recording, can be applied.
- an optical recording medium in which the data recording area is set only to the land an optical recording medium set only to the group, or an optical recording medium set to be recordable to both the land and the group.
- the present invention is applied It is possible.
- the present invention can also be applied to a case where an emboss pit and a warping group are provided in one disk.
- the group has different amplitudes on both sides of the groove. It is a warp ring groove provided to wobble. Furthermore, since both sides of the groove that wobble with different amplitudes are wobbled in the same direction in the track direction, beats are generated even if the track density is improved by narrowing the track pitch. This makes it possible to stably reproduce the wobble signal without causing an effect.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP02710313A EP1357547A4 (en) | 2001-01-18 | 2002-01-18 | "OPTICAL RECORDING MEDIUM, MATRIX OF AN OPTICAL RECORDING MEDIUM, DEVICE FOR PRODUCING AN OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING / REPLAYING DEVICE" |
US10/250,684 US6975578B2 (en) | 2001-01-18 | 2002-01-18 | Optical recording medium with grooves, optical recording medium master with grooves, apparatus for manufacturing optical recording medium master with grooves, and optical recording/reproducing apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2001009841A JP2002216395A (ja) | 2001-01-18 | 2001-01-18 | 光記録媒体、光記録媒体用原盤、光記録媒体原盤の製造装置、光記録再生装置 |
JP2001-9841 | 2001-01-18 |
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WO2002058057A1 true WO2002058057A1 (fr) | 2002-07-25 |
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PCT/JP2002/000331 WO2002058057A1 (fr) | 2001-01-18 | 2002-01-18 | Support d'enregistrement optique, matrice de support d'enregistrement optique, appareil de fabrication de support d'enregistrement optique et appareil de reproduction/enregistrement optique |
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US (1) | US6975578B2 (ja) |
EP (1) | EP1357547A4 (ja) |
JP (1) | JP2002216395A (ja) |
WO (1) | WO2002058057A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1441333A2 (en) * | 2003-01-23 | 2004-07-28 | Kabushiki Kaisha Toshiba | Information recording medium, information recording/reproducing method, and information recording/reproducing device |
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US20050122890A1 (en) * | 2002-03-15 | 2005-06-09 | Kabushiki Kaisha Toshiba | Information recording medium and information recording/ reproducing device and method |
KR20050047502A (ko) * | 2002-10-15 | 2005-05-20 | 소니 가부시끼 가이샤 | 광 기록 매체 원반 노광 장치 및 광 기록 매체 원반의노광 방법 |
DE602004014217D1 (de) * | 2003-06-10 | 2008-07-17 | Thomson Licensing | Verfahren für die Wiedergewinnung von Land Vorvertiefung |
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JP2007141344A (ja) * | 2005-11-17 | 2007-06-07 | Fujifilm Corp | 光情報記録媒体、光情報記録媒体用の基板、スタンパ、光情報記録媒体の製造方法及びスタンパの製造方法 |
JP6205736B2 (ja) * | 2013-02-06 | 2017-10-04 | デクセリアルズ株式会社 | ナノ構造体 |
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- 2002-01-18 EP EP02710313A patent/EP1357547A4/en not_active Withdrawn
- 2002-01-18 WO PCT/JP2002/000331 patent/WO2002058057A1/ja not_active Application Discontinuation
- 2002-01-18 US US10/250,684 patent/US6975578B2/en not_active Expired - Fee Related
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EP0838808A2 (en) * | 1996-10-22 | 1998-04-29 | Hitachi, Ltd. | Information recording medium which indicates information according to the wobbling of a track and information recording and reproducing apparatus |
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EP1441333A2 (en) * | 2003-01-23 | 2004-07-28 | Kabushiki Kaisha Toshiba | Information recording medium, information recording/reproducing method, and information recording/reproducing device |
EP1441333A3 (en) * | 2003-01-23 | 2007-04-18 | Kabushiki Kaisha Toshiba | Information recording medium, information recording/reproducing method, and information recording/reproducing device |
Also Published As
Publication number | Publication date |
---|---|
EP1357547A4 (en) | 2007-02-21 |
US20040114487A1 (en) | 2004-06-17 |
JP2002216395A (ja) | 2002-08-02 |
EP1357547A1 (en) | 2003-10-29 |
US6975578B2 (en) | 2005-12-13 |
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