WO2014030545A1 - Dispositif d'enregistrement optique et procédé d'enregistrement optique - Google Patents

Dispositif d'enregistrement optique et procédé d'enregistrement optique Download PDF

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Publication number
WO2014030545A1
WO2014030545A1 PCT/JP2013/071448 JP2013071448W WO2014030545A1 WO 2014030545 A1 WO2014030545 A1 WO 2014030545A1 JP 2013071448 W JP2013071448 W JP 2013071448W WO 2014030545 A1 WO2014030545 A1 WO 2014030545A1
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WIPO (PCT)
Prior art keywords
recording
track
data
guide
guide track
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PCT/JP2013/071448
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English (en)
Japanese (ja)
Inventor
順二 尾下
翔 浅野
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太陽誘電株式会社
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Publication of WO2014030545A1 publication Critical patent/WO2014030545A1/fr

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
    • 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
    • G11B7/24047—Substrates
    • G11B7/2405—Substrates being also used as track layers of pre-formatted layers

Definitions

  • the present invention relates to an optical recording apparatus and an optical recording method for performing recording on a multilayer optical disc having a plurality of recording layers.
  • the recording layer is multi-layered.
  • track king control at the time of recording or reproducing data on a recording layer is performed using a guide track provided in a layer different from the recording layer.
  • tracking control is performed using light (guide light) having a wavelength (red) of 650 nm to 680 nm on a guide track layer provided with a guide track having a groove structure, and one of the plurality of recording layers is recorded.
  • optical disk drive that performs recording using light (recording / reproducing light) having a wavelength (blue) of 390 nm to 420 nm.
  • Multi-layer optical discs tend to have a higher possibility of recording on a recorded track when recording on a recording layer due to warpage due to secular change or the like as the disc thickness increases due to multilayering.
  • the following techniques are known for such problems. *
  • an object of the present invention is to provide an optical recording apparatus and an optical recording method that can perform additional recording while minimizing a reduction in recording capacity of an optical disc.
  • an optical recording apparatus includes a recording layer capable of recording data, a guide layer provided with a land guide track and a groove guide track for tracking as a double spiral track, An optical recording apparatus for recording on an optical disc having a first guide track, wherein one of the land guide track and the groove guide track is a first guide track and the other is a second guide track.
  • the data is recorded on the recording layer as a first data track by tracking control, and after the recording of the first data track for the entire length of the first guide track is completed, the second guide is recorded.
  • the first data track of the double spiral track is first recorded on the optical disk having the double spiral track, the first data track for the entire length is recorded, and then the second data is recorded. Record a track.
  • the first data track is additionally written, it is not necessary to shift the track, so that it is possible to suppress a reduction in recording capacity due to the additional writing.
  • the control unit When the control unit records the second data track on the recording layer by tracking control for the second guide track, the first data track is adjacent to each other in the radial direction of the optical disc.
  • the offset for tracking control may be set in accordance with the tilt amount of the optical disc so that the second data track is positioned and recorded in the middle of the recording medium.
  • the offset value corresponding to the tilt amount is given to the tracking control so that the recording is already performed.
  • the second data track can be additionally written in the middle of the portion adjacent to the disk radial direction of the first data track, and overwriting of the data track can be prevented.
  • the control unit may set the offset when the data is additionally recorded on the optical disc. *
  • the control unit When the controller additionally writes the data on the optical disk on which the first data track corresponding to a part of the length of the first guide track is recorded, the control unit performs the remaining length of the first guide track. After that, the data to be additionally recorded is recorded by tracking control for the first guide track, and after the recording of the first data track for the entire length of the first guide track is completed, the first data track is recorded. Switching to tracking control for two guide tracks, at least, except for the region between the portion before writing and the portion after writing that are adjacent to each other in the radial direction of the optical disc in the first data track, The recording layer may be controlled so as to record the data as a second data track. *
  • An optical recording method is to record on an optical disc having a recording layer capable of recording data and a guide layer provided with a land guide track and a groove guide track for tracking as a double spiral track.
  • An optical recording method to be performed in which one of the land guide track and the groove guide track is a first guide track and the other is a second guide track, and tracking control is performed on the first guide track.
  • the data is recorded on the recording layer as a first data track, and after the recording of the first data track for the entire length of the first guide track is completed, the tracking for the second guide track is targeted. Switching to control, the data is stored in the recording layer in a second data track. Recorded as, is that.
  • FIG. 1 is a diagram showing an optical recording system according to an embodiment of the present invention. It is a figure which shows the accommodation form of the disc cartridge in the optical recording system of FIG. 1, and the several multilayer optical disk in this. It is a figure which shows the structure of the disk cartridge in the optical recording system of FIG. 1, a multilayer optical disk, and a drive unit. It is sectional drawing which shows the structure of a multilayer optical disk.
  • FIG. 5 is a diagram illustrating a structure of a double spiral track of a guide layer in the multilayer optical disc of FIG. 4.
  • FIG. 5 is a diagram illustrating a configuration of a region divided by radial positions of a guide layer and a recording layer in the multilayer optical disc of FIG.
  • FIG. 8 is a diagram for explaining a recording order of data tracks by the disk drive of FIG. 7. It is a figure which shows the example of the recording order of a data track, and the additional recording of the data with respect to the multilayer optical disk without a tilt. It is a figure which similarly shows the recording order of a data track
  • FIG. 6 is a diagram for explaining the reason for skipping recording of the groove data track between the last land data track portion recorded last time and the first land data track added this time. It is a figure for demonstrating the modification of 1st Embodiment.
  • FIG. 1 is a diagram showing an optical recording system according to an embodiment of the present invention. *
  • FIG. 1 is a diagram showing the overall configuration of an optical recording system.
  • the optical recording system 1 includes a storage unit 10, a disk transport mechanism 20, a drive unit 30, a RAID controller 40, and a host device 50. Details of each will be described below. *
  • the disc cartridge 10 is a unit in which a plurality of multilayer optical discs 11 which are multilayer optical recording media are individually detachably accommodated. *
  • FIG. 2 is a view showing a storage form of the disk cartridge 10 and a plurality of multilayer optical disks 11 therein.
  • the accommodation form of the plurality of multilayer optical discs 11 in the disc cartridge 10 flat stacking, vertical alignment, and the like are assumed. In any case, it is preferable that a certain gap is provided between adjacent multilayer optical discs 11 so that the multilayer optical disc 11 can be smoothly inserted into and removed from the disc cartridge 10.
  • the shape of the disk cartridge 10 is assumed to be, for example, a rectangular parallelepiped shape or a cylindrical shape from the viewpoint of handling by the user and the storage efficiency of the multilayer optical disk 11.
  • a rectangular parallelepiped disk cartridge 10 in which a plurality of multilayer optical disks 11 are accommodated in a flat stack is used. *
  • FIG. 3 is a diagram showing the configuration of the disk cartridge 10, the multilayer optical disk 11, and the drive unit 30.
  • At least one side surface of the disk cartridge 10 is provided with an opening 101 for loading and unloading the multilayer optical disk 11 and a door (not shown) for opening and closing the opening 101.
  • the door is opened and closed in conjunction with the operation of loading / unloading the multilayer optical disk 11 from / to the disk cartridge 10 by the disk transport mechanism 20, and is closed at other times.
  • the plurality of multilayer optical disks 11 accommodated in the disk cartridge 10 are taken out by the disk transport mechanism 20 and selectively transported (loaded) to the plurality of disk drives 31 in the drive unit 30. *
  • the configuration of the disk cartridge 10 is not limited to that shown in FIG.
  • Various modifications such as the shape of the disk cartridge 10, the number and position of the openings, the presence / absence of a door, and the accommodation form of a plurality of multilayer optical disks 11 are possible.
  • the multilayer optical disc 11 accommodated in the disc cartridge 10 is assumed to be a so-called guide layer separation type multilayer optical disc in which the guide layer and the recording layer are separated into separate layers. . *
  • FIG. 4 is a cross-sectional view showing a configuration of a multilayer optical disc 11 that is a guide layer separation type multilayer optical disc.
  • the multilayer optical disc 11 has a guide layer 112 and a plurality of recording layers 113.
  • the number of recording layers 113 is “4”.
  • An intermediate layer 114 having optical transparency is interposed between the guide layer 112 and the recording layer 113 closest to the guide layer 112 and between the adjacent recording layers 113.
  • These layers are the protective layer 115, the recording layer 113, the intermediate layer 114, the recording layer 113, the intermediate layer 114, the recording layer 113, the intermediate layer 114, the recording layer 113, the intermediate layer from the side on which the recording / reproducing light R1 and the guide light R2 from the optical pickup 32 are incident.
  • the layer 114, the recording layer 113, the intermediate layer 114, and the guide layer 112 are stacked in this order. *
  • a guide track 121 having a land / groove structure is spirally provided on the surface of the guide layer 112 facing the recording layer 113.
  • the guide track 121 constitutes a so-called “double spiral track” composed of a land guide track 121R and a groove guide track 121G.
  • the guide track 121 physical address information is formed by wobbling or pit rows on the side wall surface.
  • the guide track 121 is formed with a track pitch (0.64 ⁇ m) corresponding to, for example, red laser light used for recording / reproduction of a DVD (Digital Versatile Disk).
  • the average pitch between the land and the groove is 0.32 ⁇ m.
  • the laser beam of the red laser beam is referred to as “guide light”.
  • a push-pull method (PP: Push-Pull)
  • DPP Differential-Push-Pull
  • 3 beams in each of the land and groove of the guide track 121 Tracking control is performed by law. By performing tracking control in each of the land and groove of the guide track 121, information can be recorded on the recording layer 113 at a track pitch of 0.32 ⁇ m.
  • the recording layer 113 is a layer on which information is recorded at a track pitch (0.32 ⁇ m) corresponding to blue laser light used for recording / reproducing of a Blu-ray Disc (registered trademark), for example.
  • this blue laser light is referred to as “recording / reproducing light” or “recording light”.
  • the recording layer 113 is composed of, for example, a light absorption layer and a reflection layer.
  • the light absorption layer organic dyes such as cyanine dyes and azo dyes, and inorganic materials such as Si, Cu, Sb, Te, and Ge are used.
  • the target recording layer 113 in the multilayer optical disc 11 When the target recording layer 113 in the multilayer optical disc 11 is irradiated with the recording light, the reflectance of the area irradiated with the recording light is changed, and the area where the reflectance is changed is formed as a recording mark. Information is recorded in layer 113.
  • the tracking control and the acquisition of the physical address and the reference clock at the time of recording information on the recording layer 113 are performed by using the guide track 121 of the guide layer 112. Therefore, the recording layer 113 has a land / groove structure guide track. 121 is not necessary. Therefore, the surface of the recording layer 113 may be flat.
  • FIG. 6 is a diagram showing a configuration of regions divided by radial positions of the guide layer 112 and the recording layer 113 in the multilayer optical disc 11.
  • the guide layer 112 and the recording layer 113 are divided into the lead-in area, the data area, and the lead-out area in common from the inner circumference side depending on the position in the radial direction.
  • management information unique to the multilayer optical disk 11 is recorded in advance by wobbling of guide tracks or pit rows provided in lands and grooves.
  • the management information unique to the multilayer optical disc 11 includes, for example, recommended information such as the number of recording layers, recording method, recording linear velocity, laser power and laser drive pulse waveform during recording / reproduction, position information of the data area, position of the OPC area Contains information.
  • the OPC area is provided, for example, on the inner peripheral side of the lead-in area. *
  • the same information as the information recorded in the lead-in area may be recorded in advance by wobbling of the guide track 121 or a prepit row provided in the land and groove. Good. *
  • the lead-in area of the recording layer 113 (hereinafter referred to as “recording layer lead-in area”) is an area where management information used for recording / reproduction of the recording layer 113 is recorded by a recording mark.
  • Management information used for recording / reproduction of the recording layer 113 includes layer information such as a layer number assigned to the recording layer 113, replacement management information regarding replacement processing of a defective area, and recording time determined by OPC processing (calibration processing). Recording condition data such as the optimum laser power, address information of the recorded area, and the like.
  • at least the layer information is, for example, information recorded with a recording mark on each recording layer 113 before the multilayer optical disc 11 is actually used for data recording by the user. *
  • the disc conveying mechanism 20 takes out the target multilayer optical disk 11 from the disk cartridge 10 and loads it into the disk drive 31 in the drive unit 30, or conversely discharges the multilayer optical disk 11 ejected from the disk drive 31 into a disk This is a mechanism for returning to the cartridge 10.
  • the disk transport mechanism 20 operates independently so that, for example, a plurality of multilayer optical disks 11 can be taken out simultaneously or sequentially from the disk cartridge 10 and can be separately loaded into the plurality of disk drives 31 in the drive unit 30.
  • a plurality of possible transport mechanisms may be provided.
  • a plurality of disk drives 31 are mounted in the drive unit 30. In the example of FIG. 5, five disk drives 31 are mounted. In the example of FIG. 5, five disk drives 31 are mounted. The number of multilayer optical disks 11 accommodated in the disk cartridge 10 and the number of disk drives 31 mounted in the drive unit 30 are not necessarily the same. *
  • FIG. 7 is a diagram showing a configuration of the disk drive 31 that is an optical recording device.
  • the disk drive 31 includes an optical pickup 32.
  • the optical pickup 32 includes a recording / reproducing optical system corresponding to the recording / reproducing light and a guide optical system corresponding to the guide light.
  • the recording / reproducing optical system includes a first light source 33, a first collimator lens 34, a first polarizing beam splitter 35, a first relay lens 36, a second collimator lens 37, a combining prism 38, and a quarter wavelength plate. 39, an objective lens 60, a first light receiving lens 61, a first light receiving portion 62, and the like.
  • the combining prism 38, the quarter wavelength plate 39, and the objective lens 60 belong to both the recording / reproducing optical system and a guide optical system described later.
  • the first light source 33 includes a laser diode that emits blue laser light as recording / reproducing light R1.
  • the recording / reproducing light R 1 emitted from the first light source 33 is converted into parallel light by the first collimator lens 34, and passes through the first polarization beam splitter 35, the first relay lens 36 and the second collimator lens 37.
  • the light enters the combining prism 38.
  • the synthesizing prism 38 makes the optical axes of the recording / reproducing light R1 incident from the second collimator lens 37 and the guide light R2 incident from a third collimator lens belonging to a guide optical system, which will be described later, coincide with each other.
  • And is incident on the objective lens 60 through the quarter-wave plate 39.
  • the incident recording / reproducing light is collected by the objective lens 60 so as to be focused on the target recording layer 113 of the multilayer optical disc 11.
  • the recording / reproducing light (returned light) reflected by the recording layer 113 is incident on the combining prism 38 via the objective lens 60 and the quarter wavelength plate 39, and is transmitted through the combining prism 38 in the incident direction.
  • the first polarization beam splitter 35 reflects the return light of the first wavelength from the first relay lens 36 at an angle of about 90 degrees and passes through the first light receiving lens 61 to the first light receiving unit 62. Make it incident.
  • the first light receiving unit 62 includes a light receiving element whose light receiving surface is divided into four in the disk radial direction and the tangential direction, and outputs a voltage signal of a level corresponding to the light receiving intensity for each divided light receiving surface. To do. *
  • the guide optical system includes a second light source 63, a third collimator lens 64, a second polarizing beam splitter 65, a second relay lens 66, a fourth collimator lens 67, a combining prism 38, and a quarter wavelength plate 39.
  • the second light source 63 emits guide light R2 that is red laser light.
  • the guide light R2 emitted from the second light source 63 is converted into parallel light by the third collimator lens 64, and is combined through the second polarization beam splitter 65, the second relay lens 66, and the fourth collimator lens 67.
  • the light enters the prism 38.
  • the guide light R2 incident on the combining prism 38 is combined by the combining prism 38 so that the optical axis coincides with the recording / reproducing light R1 incident from the second collimator lens 37 of the recording / reproducing optical system.
  • the light enters the objective lens 60 through the quarter-wave plate 39.
  • the incident guide light R ⁇ b> 2 is collected by the objective lens 60 so as to be focused on the guide layer 112 of the multilayer optical disk 11. *
  • the guide light R2 (return light) reflected by the guide layer 112 enters the synthesis prism 38 through the objective lens 60 and the quarter wavelength plate 39, and is reflected by the synthesis prism 38 at an angle of about 90 degrees.
  • the second polarization beam splitter 65 reflects the return light of the guide light R2 from the second relay lens 66 at an angle of about 90 degrees, and passes through the second light receiving lens 68 to the second light receiving unit 69. Make it incident. *
  • the second light receiving unit 69 is constituted by, for example, a light receiving element whose light receiving surface is divided into four in the disk radial direction and the tangential direction.
  • the second light receiving unit 69 outputs a voltage signal corresponding to the amount of received light for each divided light receiving surface.
  • the optical pickup 32 is provided with a tracking actuator 70 and a focusing actuator 79.
  • the tracking actuator 70 moves the objective lens 60 in the disk radial direction that is perpendicular to the optical axis under the control of the tracking control unit 71.
  • the focusing actuator 79 moves the objective lens 60 in the optical axis direction under the control of the focus control unit 77. *
  • the optical pickup 32 guides the guide light R2 and the first relay lens actuator 80 that moves the first relay lens 36 in the optical axis direction in order to switch the recording layer 113 irradiated with the recording / reproducing light.
  • a second relay lens actuator 81 that moves the second relay lens 66 in the optical axis direction is provided.
  • the optical pickup 32 is also provided with a tilt actuator that adjusts the inclination of the objective lens 60 in the radial direction and the tangential direction with respect to the recording surface of the multilayer optical disc 11. The above is the description of the optical pickup 32. *
  • the disk drive 31 includes a tracking control unit 71, a data modulation unit 72, a first light source drive unit 73, a second light source drive unit 74, an equalizer 75, a data reproduction unit 76, a focus A control unit 77, a tracking error generation unit 82, a controller 83, a first relay control unit 84, a second relay control unit 85, and a focus error generation unit 86 are provided.
  • the disk drive 31 includes a disk motor drive unit that drives the disk motor 87, a feed mechanism that sends the optical pickup 32 in the radial direction of the multilayer optical disk 11, and a pickup vertical feed mechanism that sends the optical pickup 32 in the optical axis direction of the objective lens 60. Etc. These illustrations are omitted. *
  • the data modulator 72 modulates the recording data supplied from the controller 83 and supplies the modulated signal to the first light source driver 73.
  • the first light source drive unit 73 generates a drive pulse for driving the first light source 33 based on the modulation signal from the data modulation unit 72.
  • the equalizer 75 performs an equalization process such as PRML (Partial Response Maximum Likelihood) on the reproduction RF signal from the first light receiving unit 62 to generate a binary signal.
  • PRML Partial Response Maximum Likelihood
  • the data reproduction unit 76 demodulates data from the binary signal output from the equalizer 75, performs decoding processing such as error correction from the demodulated data, generates reproduction data, and supplies the reproduction data to the controller 83.
  • the tracking error generation unit 82 generates a tracking error signal by, for example, a push-pull method, a differential push-pull method, a three-beam method, or the like based on the output of the second light receiving unit 69 when recording data.
  • the tracking error generation unit 82 generates a tracking error signal by, for example, push-pull method, differential push-pull method, three-beam method, etc. based on the output of the first light receiving unit 62 at the time of data reproduction, for example. To do. *
  • the tracking controller 71 performs tracking control by controlling the tracking actuator 70 based on the tracking error signal to move the objective lens 60 in a direction perpendicular to the optical axis.
  • the focus error generation unit 86 generates a focus error signal based on, for example, the astigmatism method based on the output of the first light receiving unit 62.
  • the focus control unit 77 performs focus control by controlling the focus actuator 79 and moving the objective lens 60 in the optical axis direction based on the focus error signal.
  • the first relay control unit 84 controls the first relay lens actuator 80 so as to switch the recording layer to be recorded.
  • the second relay control unit 85 controls the second relay lens actuator 81 so that the guide light R2 is focused on the guide layer 112.
  • the controller 83 includes a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and the like.
  • the controller 83 controls the entire disk drive 31 based on a program loaded in the main memory area allocated to the RAM (corresponding to a “control unit” in the claims). *
  • a plurality of the disk drives 31 described above are mounted on the drive unit 30 and can be controlled independently, and information can be recorded and reproduced on the loaded multilayer optical disk 11 simultaneously.
  • RAID Controller 40 A RAID (Redundant Arrays of Inexpensive Disks) controller 40 records data in multiple on one or more disk drives 31 in the drive unit 30 in response to a recording command from the host device 50, or performs striping. RAID control to record in a distributed manner is performed.
  • the controller 83 of each disk drive 31 to which a recording or reproduction instruction is given from the RAID controller 40 performs control for recording or reproducing data on the multilayer optical disk 11.
  • the host device 50 is the highest-level device that controls the optical recording system 1.
  • the host device 50 may be a personal computer.
  • the host device 50 creates or prepares data for recording, and supplies a recording command for the data for recording to the RAID controller 40. Further, the host device 50 supplies a read command including a file name designated by a user or the like to the RAID controller 40, and acquires data of the corresponding file name from the RAID controller 40 as a response.
  • the host device 50 includes a CPU 51, a memory 52, a drive I / F 53, a disk transport mechanism I / F 54, and a system bus 56. *
  • the CPU 51 performs arithmetic processing for executing a program stored in the memory 52 and controls exchange of information with each unit through the system bus 56.
  • the memory 52 is a main memory that stores programs to be executed by the CPU 51, operation results, and the like.
  • the drive I / F 53 is an interface for communicating with the plurality of disk drives 31 through the RAID controller 40. *
  • the disk transport mechanism I / F 54 is an interface for communicating with the disk transport mechanism 20. *
  • the multi-layer optical disk 11 tends to increase as the disk thickness increases due to multi-layering due to warpage due to secular change or the like, and the possibility of recording on the recorded track when recording on the recording layer is increased.
  • recording and additional recording are performed on the multilayer optical disc 11 by the following method for such a problem.
  • this operation will be described as 1. Recording on a multi-layer optical disc 2. Data track recording order 3. Addition to the multilayer optical disk 4. The description will be made in the order of additional writing to the multilayer optical disc in which the tilt has occurred.
  • a data recording command is given from the host device 50 to the controller 83 of one or more disk drives 31 in the drive unit 30 through the RAID controller 40. Since the operation of each disk drive 31 when receiving a recording command is the same, the operation of one disk drive 31 will be described. *
  • the controller 83 of the disk drive 31 controls a feed mechanism (not shown) so as to move the optical pickup 32 to a position corresponding to the innermost circumference of the area where data is not recorded in the recording area of the recording layer 113 of the optical disk 11. Then, the disk motor drive unit (not shown) is controlled to rotate the disk 11 at an appropriate speed in the CLV method or the CAV method. *
  • the controller 83 positions the first relay lens 36 of the optical pickup 32 in the optical axis direction so that the recording light from the objective lens 60 of the optical pickup 32 is focused on the target recording layer 113 of the multilayer optical disc 11. And the position of the second relay lens 66 of the optical pickup 32 in the optical axis direction is controlled so that the guide light from the objective lens 60 of the optical pickup 32 is focused on the guide layer 112 of the optical disc 11.
  • the controller 83 of the disk drive 31 supplies the recording data transferred from the host device 50 through the RAID controller 40 to the data modulator 72.
  • the data modulation unit 72 generates a recording signal by performing modulation of recording data, adding an error correction code, and the like, and supplies the recording signal to the first light source driving unit 73.
  • the first light source driving unit 73 generates a driving pulse for the first light source 33 based on the recording signal and supplies it to the first light source 33.
  • the controller 83 outputs a control signal to the second light source driving unit 74 so as to drive the second light source 63.
  • recording of data on the recording layer 113 by the recording light from the optical pickup 32 is started. That is, data recording by the CLV method or the CAV method is started from the inner periphery to the outer periphery with respect to the target recording layer 113 of the optical disc 11. *
  • the tracking error generation unit 82 generates a tracking error signal based on the output of the second light receiving unit 69 by, for example, a PP (push-pull) method, a DPP (differential push-pull) method, or a three-beam method.
  • the tracking control unit 71 inputs a tracking error signal, supplies a tracking drive signal to the tracking actuator 70 so that the value approaches 0, and moves the objective lens 60 in a direction perpendicular to the optical axis (disk radial direction). Move to perform tracking control.
  • Tracking control at the time of recording is performed by using one guide track 121 first among the guide track 121R by the land and the guide track 121G by the groove constituting the guide track 121 provided on the guide layer 112 of the multilayer optical disc 11.
  • tracking control at the time of data reproduction is performed using a data track constituted by a row of recording marks recorded on the recording layer 113 of the multilayer optical disc 11.
  • FIG. 8, FIG. 9 and FIG. 10 are diagrams showing the recording order of data tracks by the disk drive 31 of this embodiment.
  • recording is first performed by tracking control for the land guide track 121R (see FIGS. 8 and 9), and tracking control for all the land guide tracks 121R is performed.
  • the recording is switched to the recording by tracking control for the guide track 121G of the groove (see FIG. 10). The details will be described below. *
  • FIG. 8 using a land guide track 121R, recording is performed in the order of R1, R2, and R3 from the inner circumference side to the outer circumference side of the multilayer optical disc 11 with respect to an arbitrary recording layer Lx of the multilayer optical disc 11.
  • the upper half of the figure shows the multilayer optical disk 11 viewed from a direction orthogonal to the optical axis direction of the objective lens 60, and the lower half shows an arbitrary recording layer Lx of the multilayer optical disk 11 in the optical axis direction of the objective lens 60.
  • R0 to R4 are land guide tracks 121R, and are hereinafter referred to as “land guide tracks”.
  • G0 to G4 are groove guide tracks 121G, and are hereinafter referred to as “groove guide tracks”. Note that the land guide track is actually one continuous track, and the groove guide track is the same, but for the sake of explanation, the guide track portions having different positions on the disk radius are, for example, “land guide track (R0)”. ",” Groove guide track (G0) ". *
  • the data track is recorded on the arbitrary recording layer Lx of the multilayer optical disk 11 at a pitch of 0.64 ⁇ m by performing the recording by the tracking control on the land guide track 121R first.
  • a data track recorded by tracking control for the guide track 121R in this way is referred to as a “land data track”.
  • a data track recorded by tracking control for the groove guide track 121G is referred to as a “groove data track”.
  • the physical address information is assigned to the land guide track and the groove guide track as one continuous guide track, and the physical address information is recorded by, for example, wobbling.
  • the physical address information is recorded by, for example, wobbling.
  • a series of physical address information is recorded in the order of a land guide track and then a groove guide track.
  • the address information address information of the recorded area
  • the controller 83 Prior to the additional recording of data, the controller 83 reads the address information of the last recorded data track from the lead-in area, and determines whether the data track where the additional recording is started is a land data track or a groove data track. judge. That is, in the present embodiment, the land data track is assumed as the “first data track”.
  • the controller 83 When the data track to be added is a land data track, the controller 83 performs control so that data is added as it is (without setting tracking control off-track described later).
  • FIG. 9 is a diagram showing an example of additional writing to the multilayer optical disc 11 (without tilt) in which the land data tracks RD0 to RD2 are recorded on the recording layer Lx. *
  • the controller 83 performs control so that land data tracks (RD3, RD4, RD5,...) Are recorded after the land data track (RD2) recorded immediately before additional recording.
  • the controller 83 calculates an offset for tracking control corresponding to the tilt amount of the multilayer optical disc 11, and sets the tracking control.
  • the controller 83 uses a sensor (not shown) for tilt detection to determine whether or not the multilayer optical disc 11 is tilted.
  • the offset setting process may be omitted.
  • the controller 83 switches the tracking target from the land data track 121R to the groove guide track 121G, and performs control to start recording the groove data track from GD0.
  • R0 is the innermost land guide track of the multilayer optical disc 11
  • G0 is the innermost groove guide track of the disc.
  • FIG. 6 is a diagram showing a state in which data is additionally recorded on the multilayer optical disc 11 that has been recorded.
  • the distance from the original position is shifted by a distance d determined by the tilt angle of the multilayer optical disc 11 and the recording layer Lx to be recorded.
  • the land data track and the groove data track are alternately recorded until the land data track portion of RD2 recorded last before the additional recording. Since a large margin is ensured, the possibility that the recording mark of the land data track portion of RD3 is recorded on the recording mark of the land data track portion of RD2 is low.
  • when a land data track is additionally recorded it is not necessary to shift the track, so that a reduction in recording capacity due to the additional recording can be suppressed.
  • the controller 83 calculates an offset for tracking control according to the tilt amount of the multilayer optical disc 11.
  • the multilayer optical disc 11 is tilted, there is a possibility that the recording mark of the groove data track is recorded on the recorded land guide track depending on the degree of the tilt. Therefore, when the multilayer optical disc 11 is tilted, a significant value other than “0” is set as the offset for tracking control.
  • the controller 83 switches the tracking target from the land data track 121R to the groove guide track 121G, and performs control to start recording the groove data track from GD0.
  • FIG. 13 and FIG. 14 are diagrams for explaining an example of an offset setting method for tracking control. *
  • the controller 83 irradiates the recording layer Lx to be recorded with a reproduction light beam R under the tracking control for the land guide track 121 ⁇ / b> R, and the first light receiving unit 62.
  • the level of the sum signal (hereinafter referred to as “first sum signal”) of each divided region is obtained.
  • the level of the first sum signal tends to decrease as the tilt angle generated increases.
  • the controller 83 then irradiates the recording layer Lx to be recorded with the reproducing light beam R under the tracking control with respect to the groove data track GD0, and thereby the first light receiving unit 62.
  • the level of the sum signal (hereinafter referred to as “second sum signal”) of the output of each divided region is obtained.
  • the tilt amount of the multilayer optical disc 11 is quantified as, for example, a ratio or difference between the level of the first sum signal and the level of the second sum signal.
  • the non-volatile storage element of the controller 83 stores a table indicating the correlation between the tilt quantitative value and the offset value.
  • the offset value is a value added to the tracking error signal so that the recording light beam is positioned in the middle of the portion adjacent to the disc radial direction in the land data track recorded before additional recording.
  • offset_a is obtained by replacing the offset value with a distance in the disk radial direction.
  • the controller 83 when the controller 83 obtains the quantitative value of tilt, the controller 83 obtains a corresponding offset value from the table and sets the offset value in the tracking error generation unit 82.
  • the tracking error generation unit 82 supplies the tracking control unit 71 with a result obtained by adding the set offset value to the tracking error signal generated based on the output of the second light receiving unit 69.
  • the groove data track can be additionally recorded in the middle of the adjacent portion in the disk radial direction, and the overwriting of the data track can be prevented.
  • the sign of the offset value is determined by the tilt direction of the multilayer optical disc 11.
  • the tilt direction of the multilayer optical disc 11 is determined when the recording layer Lx to be recorded is irradiated with the reproducing light beam R under the tracking control for the land guide track 121R. The determination can be made based on the magnitude relationship of the level of the output signal for each region divided in the tangential direction in the first light receiving unit 62.
  • FIG. 12 is a diagram showing a state in which the groove data track is recorded up to the position on the outer periphery side of the disc with respect to the additionally written first land data track (RD3). *
  • the tracking control offset value set as described above is reflected in the tracking control for the groove guide track portions of G0 and G1, so that the groove data track portions of GD0 and GD1 are in the land guide track. It is recorded by being positioned in the middle of adjacent portions in the disk radial direction.
  • the controller 83 resets the offset value to “0”.
  • controller 83 controls to skip recording of the groove data track between the last land data track portion (RD2) recorded last time and the first land data track (RD3) added this time. Do. This is due to the following reason. *
  • controller 83 records the groove data track between the land data track (RD2) recorded last in the previous recording and the land data track (RD3) recorded first in the current additional recording. Control to skip. This avoids overwriting of recording marks on the data track.
  • the controller 83 performs the recording by the tracking control for the groove guide track 121G with the offset value set to “0”. Control may be performed.
  • the controller 83 calculates an offset corresponding to the tilt amount of the multilayer optical disc 11 and sets the tracking control. Subsequently, the controller 83 switches the target to be tracked from the land data track 121R to the groove guide track 121G, and performs control to record the additional recorded groove data track after the already recorded groove data track.
  • the disk drive 31 of this embodiment records land data tracks on the multilayer optical disk 11 having double spiral tracks, records land data tracks for the entire length, and then records groove data tracks. As a result, when the land data track is additionally recorded, it is not necessary to shift the track, so that the reduction of the recording capacity due to the additional recording can be suppressed. 2.
  • the disk drive 31 is already recorded by giving an offset value corresponding to the tilt amount to the tracking control. It is possible to add a groove data track by positioning the land data track in the middle of a portion adjacent to the radial direction of the disk, and to prevent overwriting of the data track.
  • the controller 83 determines the tilt direction, and based on the tilt direction, determines whether the additionally recorded land data track is recorded with a deviation from the original position on the inner circumference side of the disk or on the outer circumference side. To do. When the controller 83 determines that the recorded land data track (RD3, RD4,%) Is recorded with a deviation of d from the original position on the inner circumference side of the disc as shown in FIG. Control is performed so as to skip recording of the groove data track between the track portion (RD2) and the land data track portion (RD3). *
  • the recording area of the recording layer of the multilayer optical disc 11 may be divided into a plurality of areas according to the radial position, and an offset value for tracking control may be set for each of the divided areas. As a result, overwriting of the data track by additional writing can be avoided even for the multilayer optical disc 11 whose tilt amount differs depending on the radial position.
  • the land data track is recorded first, and after all the land data tracks are recorded, the groove data track is recorded. Conversely, the groove data track is first recorded. After recording and recording all the groove data tracks, the land data tracks may be recorded.
  • ⁇ Modification 4> The above embodiment assumes a disk drive that performs recording on a multi-layer optical disk 11 with a guide layer having a plurality of recording layers. However, recording is performed on an optical disk with a guide layer that has only one recording layer. The present invention can also be applied to a disk drive to be performed. *

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  • Optical Recording Or Reproduction (AREA)

Abstract

Le problème décrit par l'invention est de permettre un ajout favorable tout en réduisant à un minimum une diminution de capacité d'enregistrement d'un disque optique. La solution de l'invention porte sur un procédé d'enregistrement optique qui effectue un enregistrement sur un disque optique comprenant : une couche d'enregistrement qui peut enregistrer des données ; et une couche de guidage telle qu'une piste de guidage en sillon et une piste de guidage en méplat pour suivi de piste sont produites sous la forme d'une piste en spirale double. En utilisant l'une de la piste de guidage en méplat et de la piste de guidage en sillon comme première piste de guidage et l'autre comme seconde piste de guidage, des données sont enregistrées d'une manière continue sous la forme d'une première piste de données dans la couche d'enregistrement au moyen d'une commande de suivi de piste avec la première piste de guidage comme sujet, et après achèvement d'enregistrement de la première piste de données pour la longueur entière de la première piste de guidage, un basculement est effectué vers une commande de suivi de piste ayant la seconde piste de guidage comme sujet et des données sont enregistrées sous la forme d'une seconde piste de données dans la couche d'enregistrement.
PCT/JP2013/071448 2012-08-23 2013-08-08 Dispositif d'enregistrement optique et procédé d'enregistrement optique WO2014030545A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10124877A (ja) * 1996-10-21 1998-05-15 Sony Corp 光再生装置、記録媒体およびトラッキング方法
JP2001167453A (ja) * 1999-12-03 2001-06-22 Olympus Optical Co Ltd 多層記録／再生ディスク装置
JP2009140552A (ja) * 2007-12-05 2009-06-25 Sony Corp 光ディスク装置及び光情報記録方法
WO2012070125A1 (fr) * 2010-11-24 2012-05-31 株式会社 東芝 Dispositif d'enregistrement et de reproduction d'informations

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10124877A (ja) * 1996-10-21 1998-05-15 Sony Corp 光再生装置、記録媒体およびトラッキング方法
JP2001167453A (ja) * 1999-12-03 2001-06-22 Olympus Optical Co Ltd 多層記録／再生ディスク装置
JP2009140552A (ja) * 2007-12-05 2009-06-25 Sony Corp 光ディスク装置及び光情報記録方法
WO2012070125A1 (fr) * 2010-11-24 2012-05-31 株式会社 東芝 Dispositif d'enregistrement et de reproduction d'informations

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