WO2014046066A1 - Dispositif et procédé d'enregistrement/reproduction optique - Google Patents

Dispositif et procédé d'enregistrement/reproduction optique Download PDF

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Publication number
WO2014046066A1
WO2014046066A1 PCT/JP2013/074950 JP2013074950W WO2014046066A1 WO 2014046066 A1 WO2014046066 A1 WO 2014046066A1 JP 2013074950 W JP2013074950 W JP 2013074950W WO 2014046066 A1 WO2014046066 A1 WO 2014046066A1
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Prior art keywords
recording
data
track
recorded
timing signal
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PCT/JP2013/074950
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English (en)
Japanese (ja)
Inventor
隆 碓井
小川　昭人
渡部　一雄
岡野　英明
真拡 齊藤
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株式会社 東芝
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Publication of WO2014046066A1 publication Critical patent/WO2014046066A1/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
    • G11B7/006—Overwriting
    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24047—Substrates
    • G11B7/2405—Substrates being also used as track layers of pre-formatted layers

Definitions

  • Embodiments described herein relate generally to an optical recording / reproducing apparatus and method for recording / reproducing information on / from an optical recording medium.
  • Optical information recording media represented by CDs (Compact Discs), DVDs (Digital Versatile Discs), BDs (Blu-ray (registered trademark) Discs) and the like have been used to shorten the wavelength of laser light and the numerical aperture of objective lenses ( The recording density is increased by increasing NA). However, all of these are said to be approaching the limits due to technical reasons and the like, and an increase in recording density by other means and methods is desired.
  • a guide layer method in which a guide layer having tracking servo information (groove) is provided separately from a recording layer in an optical information recording medium (multilayer optical disc) having a multi-layered recording layer. Multi-layer optical discs have been proposed.
  • the structure of the recording layer to be laminated becomes simple, and the disc manufacturing cost can be suppressed.
  • the state of tilt of the disc there is a possibility that data may be overwritten on a track on which data has been previously recorded. In the worst case, data may be destroyed. Therefore, there is a technique for preventing overwriting by providing a certain unrecorded area from the final position of the recorded data and starting recording of data to be additionally recorded thereafter.
  • the present disclosure has been made in order to solve the above-described problems, and an object thereof is to provide an optical recording / reproducing apparatus and method that allow easy data access.
  • the optical recording / reproducing apparatus records data on a recording medium in which one or more recording layers on which data is recorded and a guide layer used for positioning are stacked apart from each other.
  • the terminal position detection unit, the additional recording start position setting unit, the angle information detection unit, the first timing generation unit, the first recording control unit, the second timing generation unit, and the second recording control unit are included.
  • the end position detection unit determines the end position of the recorded area when there is a recorded area related to the first data in the recording layer of the recording medium and when the second data is newly recorded on the recording layer. To detect.
  • the additional recording start position setting unit sets the recording start position of the second data to a position that overlaps the recorded area rather than the end position.
  • the angle information detection unit obtains angle information related to the rotation angle of the recording medium.
  • the first timing generation unit divides the track of the recording layer into an angular area along the circumferential direction by an even number of 2 or more, and the first recording in which ON and OFF are inverted in adjacent angular areas based on the angle information A timing signal is generated.
  • the first recording control unit based on the first recording timing signal, from the position of the track recorded back the first track number from the end position of the first data, A first recording pattern composed of marks and spaces having a length different from that of the first data is intermittently recorded in the circumferential direction by the number of the first tracks along the tracks of the recording layer.
  • the second timing generation unit generates a second recording timing signal in which at least a part of the period in which the first recording timing signal is off is on.
  • the second recording control unit extends along the tracks of the recording layer according to the second recording timing signal over the number of tracks equal to or greater than the second track number from the recording start position.
  • the second data is recorded after intermittently recording a second recording pattern composed of marks and spaces having different lengths from the two data in the circumferential direction.
  • FIG. 1 is a block diagram showing an optical recording / reproducing apparatus according to an embodiment.
  • 1 is a diagram showing an optical pickup head according to the present embodiment.
  • the block diagram which shows the detail of a postscript control part.
  • the block diagram which shows the postscript control part which concerns on the modification of this embodiment.
  • FIG. 3 is a schematic diagram of data in a buffer area of the entire optical recording medium divided in the circumferential direction.
  • the block diagram which shows the reproduction
  • the figure which shows the recording pattern of the data which concerns on 2nd Embodiment.
  • the figure which shows the analysis result of the tracking error signal in the recording pattern of the data which concerns on 2nd Embodiment.
  • the figure which shows the recording pattern of the data which concerns on a prior art example The figure which shows the analysis result of the tracking error signal obtained from the recording pattern of FIG.
  • An optical recording medium 100 used in the optical recording / reproducing apparatus according to the first embodiment is a guide layer type multilayer medium, and includes a guide layer 101 having a groove and applying tracking servo, and a recording layer 102 for recording data. It is provided separately.
  • one guide layer 101 and a recording layer 102 in which 10 layers from L0 to L9 are stacked are formed in an optical recording medium.
  • Guide light 103 is focused on the guide layer 101
  • recording light 104 is focused on the recording layer 102.
  • Data recording and data reproduction are performed by focusing the recording light 104 along the position of the guide light 103.
  • FIG. 2 is a schematic diagram showing spot positions at the time of additional writing when the guide layer 101 and the recording layer 102 are separated.
  • the additional recording means that the first data is first recorded, the optical recording medium is removed from the optical recording / reproducing apparatus, and then the optical recording medium is inserted into the optical recording / reproducing apparatus again. The second data is recorded.
  • FIG. 2A shows a case where no tilt occurs in the optical recording medium, and the track position 201 on the guide layer 101 indicates the track position 202 of the recording layer 102 located vertically below.
  • data is recorded on the recording layer from the track on the left side of the guide layer to the Nth track, and a data string is formed on the recording layer as shown in FIG.
  • Fig. 2 (b) shows a case where data is added after Fig. 2 (a).
  • data it is completely unknown how the optical recording medium is tilted, and it is natural to think that a tilt state different from the previous recording occurs.
  • FIG. 2B it is a state when the tilt ⁇ occurs. Since it can be extracted from the management information that the previously recorded data has been recorded up to the Nth track, additional recording is started from the N + 1th track in the case of a normal optical recording medium.
  • the beam spot of the recording layer 102 is a track position 202 shifted by d ⁇ tan ⁇ in terms of the optical recording medium coordinates. As a result, it may interfere with the previously recorded track, and in the worst case, the data may be destroyed.
  • the intentional pause of recording due to, for example, buffer underrun or recording strategy / servo parameter adjustment such as resuming recording immediately without re-inserting the optical recording medium, causes extreme tilt and lens shift conditions. It is assumed that there is no tilt, that is, a tilt that causes a problem does not occur.
  • An optical recording / reproducing apparatus 300 includes a CPU 301, an interface unit 302, a RAM 303, an NV-RAM 304, a ROM 305, an error correction unit 306, an additional write control unit 307, a spindle motor control unit 308, a spindle motor 309, and a rotary encoder.
  • the CPU 301 receives an operation command from the host device 350 via the interface unit 302.
  • the CPU 301 generates a control signal in accordance with the operation command, and an error correction unit 306, a spindle motor control unit 308, a feed motor control unit 312, a PLL control unit 315, a laser modulation control unit 316, a collimator lens actuator control unit 318, a focus described later
  • the entire optical recording / reproducing apparatus 300 such as the control unit 319, the track control unit 320, and the data reproducing unit 321 is comprehensively controlled.
  • the CPU 301 uses the RAM 303 as a work area, appropriately refers to the parameters of each device recorded in the nonvolatile memory NV-RAM 304, and performs a predetermined operation according to the control program recorded in the ROM 305.
  • the error correction unit 306 corrects the reproduction data with errors.
  • the additional write control unit 307 receives data from a data reproduction unit 321 (to be described later) and address information from the address reproduction unit 322, and refers to the data and the address information as appropriate to perform additional data processing. Details of the write-once control unit 307 will be described later with reference to FIG.
  • the reproduction control unit 1200 receives a tracking error signal output from an RF amplifier 317, which will be described later, and address information from the address generation unit 322, and controls the track control unit 320 based on a command from the CPU 301. The operation of the reproduction control unit 1200 will be described later with reference to FIG.
  • the spindle motor control unit 308 receives a control signal from the CPU 301 via the signal bus 351 and generates a spindle motor drive signal.
  • the spindle motor 309 receives a spindle motor drive signal from the spindle motor control unit 308, and rotationally drives the optical recording medium 100 installed according to the spindle motor drive signal.
  • a rotation angle signal is provided from a rotary encoder 310 provided in the spindle motor 309.
  • the rotation angle signal for example, five pulses are generated when the spindle motor makes one rotation. From this rotation angle signal, the rotation angle and the number of rotations of the spindle motor can be determined.
  • the optical pickup head 311 generates a light reception signal by irradiating the optical recording medium 100 with a laser and receiving reflected light from the optical recording medium 100.
  • the optical pickup head is connected via a feed motor 313, a gear, and a screw shaft 314. The detailed structure of the optical pickup head 311 will be described later with reference to FIG.
  • the feed motor control unit 312 receives the control signal and generates a feed motor drive signal.
  • the feed motor 313 receives the feed motor drive signal from the feed motor control unit 312 and rotates in accordance with the feed motor drive signal, thereby moving the optical pickup head in the radial direction of the optical recording medium 100.
  • the PLL control unit 315 receives a control signal from the CPU 301 and performs phase synchronization to generate a recording clock signal for recording and a reproduction clock signal for reproduction.
  • the laser modulation control unit 316 records data to be recorded from the host device 350 via the interface unit 302 when recording data (mark formation), a recording clock signal from the PLL control unit 315, and the CPU 301 and additional recording control. A control signal is received from the unit 307.
  • the laser modulation control unit 316 generates a writing signal based on the recording data, the recording clock signal, and the control signal, and provides it to the optical pickup head 311. Further, the laser modulation control unit 316 provides a read signal smaller than the write signal to the optical pickup head 311 when reading data.
  • the laser modulation control unit 316 causes the optical pickup head 311 to emit light at the reproduction laser power, the recording laser power, and the erasing laser power set by the CPU 301 based on the light reception signal from the optical pickup head 311. Control the included laser diode.
  • the RF amplifier 317 receives a light reception signal from the optical pickup head 311.
  • the RF amplifier 317 generates a first focus error signal, a second focus error signal, a first tracking error signal, a second tracking error signal, and a reproduction signal based on the received light signal.
  • the first focus error signal is a signal indicating an error from the just focus of the guide layer.
  • the second focus error signal is a signal indicating an error from the just focus of the recording layer.
  • the first tracking error signal is a signal indicating an error between the center of the laser beam spot and the center of the guide track.
  • the second tracking error signal is a signal indicating an error between the laser beam spot center and the recorded track center.
  • the reproduction signal is a full addition signal of the received light signal.
  • the collimator lens actuator control unit 318 receives the first focus error signal from the RF amplifier 317 based on the command from the CPU 301, and generates a collimator lens focus drive signal according to the first focus error signal.
  • the collimator lens focus drive signal is supplied to the drive coil in the focus direction of the collimator lens lens actuator. Thus, focus servo is performed in which the red laser light is always just focused on the guide layer of the optical recording medium 100.
  • the focus control unit 319 receives the second focus error signal from the RF amplifier 317 based on the command from the CPU 301, and generates a focus drive signal according to the second focus error signal.
  • the focus drive signal is supplied to the drive coil in the focus direction of the objective lens actuator. As a result, focus servo is performed in which the blue laser light is always just focused on the recording layer of the optical recording medium 100.
  • the track control unit 320 receives the first tracking error signal and the second tracking error signal from the RF amplifier 317 based on a command from the CPU 301.
  • the track controller 320 generates a track driving signal according to the first tracking error signal and the second tracking error signal.
  • the track drive signal is supplied to a drive coil in the tracking direction of the objective lens actuator.
  • tracking servo is performed in which the laser beam always traces the track formed on the optical recording medium 100.
  • the feed motor control unit 312 controls the feed motor 313, that is, the optical pickup head 311 so that the objective lens is positioned near a predetermined position. The That is, tracking servo control is performed in a direction in which the amount of deviation of the optical recording medium 100 from the predetermined position of the objective lens in the radial direction (hereinafter referred to as lens shift amount) is reduced.
  • the optical recording medium 1 corresponds to the recording data in the full addition signal of the light reception signal from each photodetection cell of the photodetector described later included in the optical pickup head. Changes in the reflected light from the pits formed on the track are reflected, and this becomes a reproduction signal.
  • the data reproduction unit 321 receives a reproduction signal from the RF amplifier 317 and a reproduction clock signal from the PLL control unit 315, respectively. As for the reproduction signal, the data reproduction unit 321 reproduces the recording data based on the reproduction clock signal.
  • the address reproduction unit 322 receives a reproduction signal from the RF amplifier 317 and extracts address information from the reproduction signal.
  • the optical pickup head includes a blue laser diode 401, a polarizing beam splitter (PBS) 402 and a polarizing beam splitter 407, a quarter wave plate 403 and a quarter wave plate 408, a collimator lens 404 and a collimator lens 409, and a collimator lens actuator. 405 and a collimator lens actuator 410, a red laser diode 406, a dichroic prism 411, an objective lens 412, an objective lens actuator 413, and a photodetector IC (PDIC) 414 and a photodetector IC 415.
  • PBS polarizing beam splitter
  • PDIC photodetector IC
  • the blue laser diode 401 is a semiconductor laser having a wavelength of 405 nm, for example, and irradiates the recording layer of the optical recording medium 100 with a light beam for recording and reproduction.
  • the polarization beam splitter 402 transmits incident light from the blue laser diode 401, and reflects light reflected by the optical recording medium 100 and having a 90-degree polarization plane rotated from the incident light.
  • the quarter-wave plate 403 transmits incident light from the blue laser diode 401 and converts linearly polarized light into circularly polarized light. Further, the blue laser diode 401 transmits reflected light from the optical recording medium 100 and converts circularly polarized light into linearly polarized light. The linearly polarized light at this time is linearly polarized light having a 90-degree polarization plane different from that of the incident light.
  • the collimator lens 404 converts incident light from the blue laser diode 401 into substantially parallel light.
  • the collimator lens actuator 405 drives the collimator lens 404 so that the light beam of the blue laser beam that has passed through the objective lens 412 moves in the focus direction indicating the thickness direction of the optical recording medium 100. Specifically, the collimator lens 404 is driven so as to approach or move away from the facing surface of the quarter-wave plate 403.
  • the red laser diode 406 is a semiconductor laser having a wavelength of 655 nm, for example, and irradiates the guide layer of the optical recording medium 100 with a tracking servo beam.
  • the polarization beam splitter 407 transmits incident light from the red laser diode 406, and reflects light reflected by the optical recording medium 100 and having a 90-degree polarization plane rotated from the incident light.
  • the quarter-wave plate 408 is similar to the quarter-wave plate 403, transmits incident light from the red laser diode 406, and converts linearly polarized light into circularly polarized light. Further, the reflected light from the optical recording medium 100 of the red laser diode 406 is transmitted, and circularly polarized light is converted into linearly polarized light.
  • the collimator lens 409 converts incident light from the red laser diode 406 into substantially parallel light.
  • the collimator lens actuator 410 is the same as the collimator lens actuator 405, and drives the collimator lens 409 so that the red laser beam that has passed through the objective lens 412 moves in the focus direction indicating the thickness direction of the optical recording medium 100. .
  • the collimator lens 409 is driven so as to approach or move away from the facing surface of the quarter-wave plate 408.
  • the dichroic prism 411 transmits the incident light from the blue laser diode 401 and reflects the incident light from the red laser diode 406.
  • the objective lens 412 focuses the light beam emitted from the blue laser diode 401 on the recording layer of the optical recording medium 100. Further, the light beam emitted from the red laser diode 406 is condensed on the guide layer of the optical recording medium 100.
  • the objective lens actuator 413 drives the objective lens 412 in the focus direction so that each light beam that has passed through the objective lens 412 moves in the focus direction on the optical recording medium 100. Further, the objective lens 412 is driven so that the light beam that has passed through the objective lens 412 moves in the radial direction on the optical recording medium 100.
  • the photodetector IC 414 is composed of, for example, a quadrant photodetection cell, and the reflected light reflected by the polarization beam splitter 402 is detected by these photodetection cells to obtain a light reception signal.
  • the generated light reception signal is output to the RF amplifier 317.
  • the photodetector IC 415 includes, for example, a quadrant photodetection cell, and the reflected light reflected by the polarization beam splitter 407 is detected by these photodetection cells to obtain a light reception signal.
  • the generated light reception signal is output to the RF amplifier 317.
  • a blue front monitor PD included in the optical pickup head 311 and configured by a photodiode branches a part of the laser beam generated from the laser diode 401 by a fixed ratio by a half mirror (not shown), that is, the amount of light. A light reception signal proportional to the irradiation power is detected.
  • the blue front monitor PD supplies the light reception signal to the laser modulation control unit 316.
  • a red front monitor PD (not shown) that is included in the optical pickup head 311 and is configured by a photodiode branches a part of laser light generated from the laser diode 406 by a certain ratio by a half mirror (not shown) to divide the light amount, that is, irradiation A light reception signal proportional to the power is detected.
  • the front monitor PD for red supplies a red laser modulation control unit (not shown).
  • the additional write control unit 307 includes an end position detection unit 501 and an additional write start position setting unit 502.
  • the end position detection unit 501 determines the end position of the first data when there is a recorded area related to the first data in the recording layer of the optical recording medium and new second data is recorded on the same recording layer. To detect.
  • the additional recording start position setting unit 502 receives the end position from the end position detection unit 501, sets the recording start position of the second data to a position that overlaps the recorded area beyond the end position, and based on the information about the recording start position.
  • the track controller 320 and the feed motor controller 312 are controlled.
  • the first data 601 starts to be recorded on the optical recording medium according to a normal recording procedure. That is, the servo light spot is subjected to tracking servo so as to follow the guide groove of the guide layer, and the recording spot having a different focal point on the same axis as the servo light is focused on the recording layer, and recording is performed on the recording layer.
  • the spiral data generally following the guide track is recorded.
  • first buffer track an area where data from the end of the first data 601 up to a predetermined number of tracks is written.
  • the second data 602 is appended after the first data 601 after an arbitrary time has elapsed, the data from the start of the second data 602 to the data of a predetermined number of tracks is called a second buffer track.
  • the first buffer track and the second buffer track are collectively defined as a buffer region 603.
  • the first buffer track and the second buffer track are overlapped in the radial direction of the optical recording medium by at least one track pitch, so that no matter how the tilt and lens shift change, there is always a boundary between data. A reproduced signal is present.
  • tracking can be performed during continuous playback.
  • the data pattern recorded on the first buffer track and the second buffer track defined here may be a single pattern or a dummy mark that does not depend on a predetermined modulation method.
  • the data can be a part of the first data 601 and the second data 602, or can be arbitrary data representing management information other than user data. That is, any data pattern may be used.
  • the additional recording start position setting unit 502 uses, as the start position of the second data 602, a track represented by the following formula from the address indicating the end of the first data 601 obtained by the end position detection unit 501.
  • the address shifted to the recorded area (first data) by the number X as the additional recording start position, even if a tilt or lens shift different from the previous recording occurs during additional recording, the overlap is reliably realized. be able to.
  • the number of tracks X for realizing the overlap is the maximum possible tilt amount ⁇ max , the lens shift amount Ls max , the distance d between the guide layer and the recording layer, the refractive index n of the medium, the lens shift amount and the maximum Assuming that the coefficient S and the track pitch Tp indicate the relationship with the amount of spot position deviation, the equation (1) can be obtained.
  • X is a positive integer.
  • the coefficient S indicating the relationship between the lens shift and the spot position deviation amount can be derived analytically from the optical design value, or can be obtained in advance from the actual measurement value.
  • the number of margin tracks which is the number of tracks that can be overlapped, may be determined for the first buffer track number A and the second buffer track number B, instead of simply overlapping.
  • the number of overlapping margin tracks is Y, it is determined so as to satisfy the following expressions (2) and (3).
  • X and Y are positive integers
  • FIG. 7A and 7B show (a) when the tilt and lens shift states are not changed (Normal) and (b) when tilt and lens shift occur in the direction in which the tracks are farthest from each other (Far). ) And (c) (Near) are shown when the tracks occur in the closest direction.
  • the overlap margin track Y 10.
  • the start of additional data in the buffer region 603 is possible regardless of any tilt and lens shift.
  • the position is settled. Therefore, overwriting to data tracks other than the buffer area can be completely suppressed, and necessary data can be protected.
  • data may be recorded intermittently by dividing the first buffer track and the second buffer track in the circumferential direction of the optical recording medium. By doing so, destruction of data in the buffer track can be prevented, and readable data can be recorded in the buffer track.
  • the additional write control unit according to this modification will be described with reference to the block diagram of FIG.
  • the write-once control unit 800 according to this modification includes an angle information detection unit 801, a first timing generation unit 802, a first recording control unit 804, a second timing generation unit 803, and a second recording control unit 805.
  • the angle information detection unit 801 obtains angle information related to the rotation angle of the optical recording medium.
  • the angle information may be obtained from address information obtained from the guide layer of the optical recording medium, for example.
  • the rotation speed control method of the optical recording medium is a ZCAV (Zoned Constant Angular Velocity) method in which the rotation speed (angular velocity) is constant within a predetermined zone, angle information can be obtained simultaneously with address information.
  • a spindle motor encoder or a rotary encoder pattern formed on the inner circumference / outer circumference of the optical recording medium may be used.
  • the first timing generation unit 802 receives angle information from the angle information detection unit 801.
  • the first timing generation unit 802 turns on the adjacent angle region based on the angle information for the angle region obtained by dividing the track of the angle information recording layer into N pieces (N ⁇ 2 even number) along the circumferential direction. And a first recording timing signal in which OFF is inverted is generated.
  • the second timing generation unit 803 receives the first recording timing signal from the first timing generation unit 802 and outputs a second recording timing signal in which at least a part of the first recording timing signal is on during the off period. Generate.
  • the first recording control unit 804 receives the first recording timing signal from the first timing generation unit 802.
  • the first recording control unit 804 goes back by the number of the first buffer tracks from the end position of the first data based on the difference between the total capacity of the first data to be recorded and the recorded data capacity already recorded.
  • the track position is detected, and the first data is intermittently recorded in the circumferential direction along the track in accordance with the first recording timing signal.
  • the same effect can be obtained by recording arbitrary data intermittently in the circumferential direction along the track in accordance with the first recording timing signal after the first data recording is completed, in accordance with the first recording timing signal. can get.
  • the second recording control unit 805 receives the recording start position from the additional recording start position setting unit 502 and the second recording timing signal from the second timing generation unit 803, respectively.
  • the second recording control unit 805 intermittently distributes the second data in the circumferential direction along the track in accordance with the second recording timing signal from the recording start position of the second data over the number of the second buffer tracks or more. Record.
  • FIG. 9 shows an example in which one round of the optical recording medium is divided into a angular regions.
  • the second timing generation unit 803 outputs a signal obtained by inverting the first recording timing signal as the second recording timing signal.
  • the second recording timing signal may be the recording on timing
  • the second recording timing signal may be the recording off timing.
  • the first recording timing signal and the second recording timing signal may overlap the recording off timing to some extent as long as the angular area of the medium indicated by the recording on timing does not overlap. That is, it is not necessary that the ratio between the recording on time and the off time is 1: 1.
  • FIG. 10 shows a case where the second data 1002 is recorded after the first data 1001 is recorded, and the end portion of the first data is placed on the first buffer track 1004 in the buffer area 1003 by the recording method according to the modification.
  • the start portion of the second data is recorded in the second buffer track 1005.
  • the first data 1001 and the first buffer track 1004 are represented by thin lines, and the second data 1002 and the second buffer track 1005 are represented by thick lines.
  • the first recording control unit 804 records data according to the above-described first recording timing signal, for example, when the first recording timing signal is “H”, and stops recording when the first recording timing signal is “L”. To do. As a result, as shown in the first buffer track 704, the first data is intermittently recorded by being divided in the circumferential direction of the optical recording medium. At the time of additional recording, the second recording control unit 805 records the second buffer track 1005 so as to overlap the first buffer track 1004. At this time, for example, the second recording timing signal is “H” according to the second recording timing signal. Data is sometimes recorded, and recording is stopped when the second recording timing signal is “L”.
  • the second buffer track 1005 is intermittently recorded in an angular area where the first buffer track 1004 is not recorded.
  • the first buffer track 1004 and the second buffer track 1005 overlap in the radial direction of the optical recording medium, but the data itself forming each buffer track is accurately separated and recorded when viewed two-dimensionally. . Therefore, the data recorded in the buffer area 1003 can be recorded without being destroyed.
  • FIG. 11 shows a schematic diagram of data divided in the circumferential direction in the buffer region of the entire optical recording medium.
  • the thin line in the figure is the first buffer track 1101, and the thick line in the figure is the second buffer track 1102.
  • the sampling frequency in order to avoid the influence of the servo phase delay, it is necessary to sample the signal at a sampling frequency of 10 times or more of the servo band. That is, when the division number is a, the sampling number per rotation of the optical recording medium (a / 2), the rotational frequency R (Hz) of the optical recording medium, and the cutoff frequency F (Hz) of the tracking servo, a> 2 ⁇ 10 ⁇ F / R (4) It is understood that it is necessary to.
  • the signal band of the tracking error signal is K (Hz)
  • the time required to pass through one divided angular region is equal to or more than the time constant 1 / (2 ⁇ K) until the output is stabilized.
  • the reproduction control unit 1200 includes a timing signal generation unit 1201, a sampling unit 1202, and a switching unit 1203.
  • the timing signal generation unit 1201 receives the first recording timing signal from the first timing generation unit 802 and the second recording timing signal from the second timing generation unit 803, respectively.
  • the timing signal generation unit 1201 generates a first sample timing signal for determining the first sample timing and a second sample timing signal for determining the second sample timing based on the first recording timing signal and the second recording timing signal. Generate.
  • the sampling unit 1202 generates the first sample timing signal and the second sample timing signal from the timing signal generation unit 1201 and the tracking error signal generation unit (not shown) included in the RF amplifier 317 generates the first sample timing signal and the second sample timing signal. 2 tracking error signals are received respectively.
  • the sampling unit 1202 samples and holds the second tracking error signal based on the first sample timing signal and the second sample timing signal. As a result, a first sampled tracking error signal at the first sample timing is obtained, and a second sampled tracking error signal at the second sample timing is obtained.
  • the switching unit 1203 receives the first sampled tracking error signal and the second sampled tracking error signal from the sampling unit 1202.
  • the switching unit 1203 controls the track control unit 320 by switching and outputting the first sampled tracking error signal and the second sampled tracking error signal according to the address information.
  • the tracking error signal generation unit is described as being included in the RF amplifier 317. However, the tracking error signal generation unit may be provided in the reproduction control unit 1200.
  • FIG. 21 shows a first modification of the reproduction control unit 1200 when the tracking error signal generation unit is included in the reproduction control unit.
  • the reproduction control unit 1200 includes a timing signal generation unit 1201, a sampling unit 1202, a switching unit 1203, and a tracking error signal generation unit 2101.
  • the tracking error signal generation unit 2101 generates a tracking error signal based on the light reception signal output from the photo detector IC 414 or the photo detector IC 415 in the optical pickup head 311.
  • the reproduction control unit 1200 includes a timing signal generation unit 1201, a sampling unit 1202, a switching unit 1203, and a tracking error signal generation unit 2101.
  • the sampling unit 1202 includes a single-pole double-throw (SPDT) type switch 2201 that is switched based on the timing signal output from the timing signal generation unit 1201, and two low-pass filters formed by a resistor and a capacitor connected to the switch 2201. A combination of 2202 and an amplifier 2203 that enhances output can be used.
  • the switching unit 1203 can be a 2-to-1 multiplexer 2204. Accordingly, the low-pass filter and the sampling unit can be shared, and the circuit of this embodiment can be configured with a small number of elements.
  • the reproduction control unit 1200 includes a timing signal generation unit 1201, a sampling unit 1202, a switching unit 1203, and a tracking error signal generation unit 2301.
  • the tracking error signal generation unit 2301 is based on the DPD method, and a phase advance pulse indicating that the beam spot is shifted in a predetermined direction with respect to a predetermined track (for the sake of explanation, a positive direction) It can be configured to output a phase lag pulse indicating that it is shifted in the opposite direction (minus direction).
  • a tracking error signal can be generated by taking a difference between a value obtained by integrating the phase advance pulse through a low-pass filter and a value obtained by integrating the phase delay pulse through a low-pass filter.
  • the sampling unit 1202 includes a double pole double throw (DPDT) type switch 2302 that is switched based on the timing signal output from the timing signal generation unit 1201.
  • DPDT double pole double throw
  • One of the two poles of the switch 2302 distributes the phase advance pulse to the two low-pass filters 2303-1 according to the timing signal to obtain two phase advance signals.
  • Another one of the two poles of the switch 2302 distributes the phase lag pulse to the two low-pass filters 2302-2 according to the timing signal to obtain two phase lag signals.
  • two sampled tracking error signals are obtained by two differential amplifiers 2304 that calculate the difference between the phase advance signal and the phase lag signal.
  • the switching unit 1203 can be a 2-to-1 multiplexer 2205.
  • a deviation amount from the recorded data string in the buffer area can be obtained as a tracking error signal.
  • the sampling unit 1202 may alternately sample and hold in synchronization with the recording timing signal.
  • the first sampled tracking error signal obtained from the data string forming the first buffer track in the buffer area and the second sampled tracking error signal obtained from the data string forming the second buffer track are made independent. Can get to. By obtaining the first sampled tracking error signal and the second sampled tracking error signal independently, each track can be selectively traced.
  • the track section 1301 data is obtained using the tracking error signal obtained from the first data from the inner periphery to the outer periphery. Play.
  • switching to the first sampled tracking error signal is performed from the time when the data recorded in the buffer area is reproduced.
  • switching to the second sampled tracking error signal is performed when it is determined that the first buffer track and the second buffer track overlap in the radial direction.
  • there is a possibility that a several track jump may occur due to the influence of the switching operation of the servo signal.
  • by providing the above-described overlap margin track Y it is possible to find the switched destination track.
  • the track section 1304 when it is determined that the second buffer track is completed, the track section 1304 is switched to a tracking error signal obtained from the second data.
  • the buffer area is formed by overlapping the end of the first data and the start of the second data as additional recording data by several tracks in the radial direction of the optical recording medium.
  • tracking servo can be continuously applied at the time of reproduction even in a tilt state different from the time when the previous data was recorded at the time of additional writing. Therefore, data access can be easily performed during reproduction.
  • the buffer track forming the buffer area is divided into a plurality of areas along the circumferential direction, and the first data and the second data as additional data are alternately recorded in the circumferential direction, so that the existing data The desired data can be recorded even in the buffer area without being overwritten, and the data can be easily accessed during reproduction.
  • the data pattern recorded on the first buffer track and the second buffer track is assumed to be a random pattern or an arbitrary fixed pattern.
  • the first buffer track is used.
  • the data pattern recorded on the second buffer track is recorded as a data pattern different from the user data area. By doing so, it is possible to easily determine the buffer region without performing advanced processing, and it is possible to obtain a more stable tracking error signal.
  • the configuration of the optical recording / reproducing apparatus according to the second embodiment is the same as that of the optical recording / reproducing apparatus according to the first embodiment shown in FIGS.
  • FIG. 14 is a diagram for explaining the phase relationship with adjacent tracks.
  • the first recording control unit 804 or the second recording control unit 805 prepares two different repetitive patterns whose cycles do not have a multiple relationship, and alternately arranges them every other track.
  • a mark 1401 is an area where data is recorded.
  • a space 1402 is a blank area where no data is recorded.
  • Each of the two repeating patterns includes a fixed pattern A 1403 whose minimum repeating unit is an N [T] mark-N [T] space, and a fixed pattern B 1404 whose minimum repeating unit is an M [T] mark-M [T] space (however, N and M are assumed to be positive integers and N> M).
  • [T] is a unit representing the 1 / channel clock frequency. At this time, N and M are
  • FIG. 14A shows an example in which the fixed pattern A 1403 is a 6 [T] mark-6 [T] space, and the fixed pattern B 1404 is a 4 [T] mark-4 [T] space.
  • FIG. 14B is an example in which the fixed pattern of the track is reversed from FIG.
  • N and M are preferably selected from mark lengths used for modulation of the data area.
  • 1-7PP modulation is used in the data area
  • N and M are close values. Specifically,
  • the tracking error signal sensitivity fluctuation for each track can be suppressed to a level that does not cause a problem in practice.
  • a fixed pattern B1404 minimum repetition period 8T which is a repeated pattern of the fixed pattern 4 [T] mark-4 [T] space is recorded.
  • a trigger signal indicating the next rotation of the disk is input, a fixed pattern A1403 is recorded, and this is repeated until the predetermined number of tracks is reached.
  • FIG. 15 shows an example of reading the track data of the fixed pattern B in the case where recording is performed with the pattern as shown in FIG. 14A by the DPD method generally used in the optical disc.
  • the vertical axis is the value of the tracking error signal
  • the horizontal axis is the distance indicating how much the beam spot is displaced in the radial direction of the disk from the track to be read.
  • a graph 1501 is a tracking error signal when the fixed pattern of the adjacent track is random.
  • graphs 1502 to 1505 the start of the mark of the track to be read and the start of the mark of the adjacent track are shown. This is a tracking error signal when it is deviated by one track pitch in the track direction. As shown in FIG. 15, it can be seen that there is no significant change in the tracking error signal obtained even if the position with the adjacent track is changed.
  • FIG. 16 shows the displacement of the tracking error signal when the fixed pattern of the second embodiment is used.
  • the upper row is an RF signal 1601
  • the lower row is a case where a repeating pattern of 4 [T] mark-4 [T] space and a repeating pattern of 6 [T] mark-6 [T] space are arranged every other track.
  • This is a tracking error signal 1602 when the beam spot is moved in the radial direction of the disk.
  • the tracking error signal has an ideal sawtooth waveform, and it can be seen that a tracking error signal with small amplitude fluctuation is obtained.
  • FIG. 17 shows the phase relationship with the adjacent track in the fixed pattern
  • FIG. 17A shows the case where the phase with the adjacent pattern is aligned
  • FIG. 17B shows the phase with the adjacent pattern inverted. Indicates the case.
  • FIG. 18 shows the analysis result when the tracking error signal is obtained by the DPD method generally used in the optical disc in the data pattern arranged as described above.
  • a graph 1801 is a case where the pattern of adjacent tracks is random, like the graph 1501 shown in FIG. 15.
  • a graph group 1802 shows a case where adjacent tracks have the same phase, and a graph group 1803 shows that the adjacent tracks are reversed. The case of phase is shown.
  • the graph group 1802 when the adjacent tracks have the same phase, the amplitude of the tracking error signal is remarkably reduced.
  • the amplitude increases in the case of the reverse phase.
  • FIG. 19 shows an example in which the adjacent phase for each track is calculated.
  • 1 [T] 1 / CCLK
  • CCLK 66 [MHz]
  • T p 0.32 [ ⁇ m]
  • r 0 30 [mm].
  • FIG. 19 is a graph when the adjacent phase is calculated, and it can be seen that the phase relationship with the adjacent track repeats the same phase and the opposite phase as shown in FIG. 19 and changes for each track. Considering the analysis results of FIG. 18 and FIG. 19 together, this means that the amplitude of the tracking error signal changes for each track.
  • FIG. 20 shows the displacement of the tracking error signal when the fixed pattern is used. As shown in FIG. 20, the portion where the tracking error signal is not output and the portion where the tracking error signal is output are not equal. On the other hand, according to the recording pattern according to the second embodiment, an ideal tracking error signal can be obtained.
  • optical recording medium can be applied to the rewritable phase change type recording method according to the present embodiment, and the write-once type medium is more necessary for additional writing.
  • the recording method according to the present embodiment is particularly effective.
  • PLL control section 316... Laser modulation control section, 317.
  • Collimator lens actuator control unit 319... Focus control unit, 320... Track control unit, 321... Data reproduction unit, 322... Address reproduction unit, 350.
  • second data 603 ... buffer region, 704 ... first buffer track, 705 ... second buffer track, 801 ... angle information Detection unit, 802 ... 1st timing generation unit, 803 ... 2nd timing generation unit, 804 ... 1st recording control unit, 805 ... 2nd recording control unit, 1001 ... 1st recording Data, 1002 ... Second recording data, 1003 ... Buffer area, 1004, 1101 ... First buffer track, 1005, 1102 ... Second buffer track, 1200 ... Playback control unit, 1201 ..Timing signal generator 1202 Sampling unit 1203 Switching unit 1301 1302 1303 1304 Track section 1401 Mark 1402 Scan Pace, 1403 ... Fixed pattern A, 1404 ...
  • Fixed pattern B 1501-1505, 1801 ... Graph, 1601 ... RF signal, 1602 ... Tracking error signal, 1802, 1803 ... Graph Group, 2101, 2302 ... tracking error signal generator, 2201, 2302 ... switch, 2202, 2303 ... low pass filter, 2203 ... amplifier, 2204 ... multiplexer, 2304 ... differential amplifier .

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  • Optical Recording Or Reproduction (AREA)

Abstract

Conformément à un mode de réalisation de l'invention, ce dispositif d'enregistrement/reproduction optique est pourvu d'une unité de détection de position finale, d'une unité de configuration de position de lancement de Postscript, d'une unité de détection d'informations d'angle, d'une première unité de génération de synchronisation, d'une première unité de commande d'enregistrement, d'une seconde unité de génération de synchronisation, et d'une seconde unité de commande d'enregistrement. Lors de l'enregistrement de premières données, la première unité de commande d'enregistrement démarre à partir de la position d'une piste qui est enregistrée une piste avant la position finale des premières données et enregistre un premier motif d'enregistrement comprenant des marques et des espaces de longueurs qui diffèrent de ceux des premières données le long de la piste d'une couche d'enregistrement d'après un premier signal de temporisation d'enregistrement, ledit premier motif d'enregistrement étant enregistré de façon intermittente dans le sens circonférentiel uniquement dans la piste précitée. Lors de l'enregistrement de secondes données, le second dispositif de commande d'enregistrement enregistre les secondes données après l'enregistrement d'un second motif d'enregistrement comprenant des marques et des espaces de longueurs qui diffèrent de ceux des secondes données le long de la piste de la couche d'enregistrement à partir d'une position initiale d'enregistrement sur un certain nombre de pistes égal ou supérieur à deux pistes conformément à un second signal de temporisation d'enregistrement, ledit second motif d'enregistrement étant enregistré de façon intermittente dans le sens circonférentiel.
PCT/JP2013/074950 2012-09-21 2013-09-13 Dispositif et procédé d'enregistrement/reproduction optique WO2014046066A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO2012063326A1 (fr) * 2010-11-09 2012-05-18 株式会社 東芝 Support d'enregistrement d'informations, dispositif de reproduction d'informations et dispositif d'enregistrement d'informations

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO2012063326A1 (fr) * 2010-11-09 2012-05-18 株式会社 東芝 Support d'enregistrement d'informations, dispositif de reproduction d'informations et dispositif d'enregistrement d'informations

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