WO2005008646A1 - Dispositif et procede permettant de d'enregistrer des donnees sur un disque optique enregistrable - Google Patents

Dispositif et procede permettant de d'enregistrer des donnees sur un disque optique enregistrable Download PDF

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Publication number
WO2005008646A1
WO2005008646A1 PCT/JP2004/009246 JP2004009246W WO2005008646A1 WO 2005008646 A1 WO2005008646 A1 WO 2005008646A1 JP 2004009246 W JP2004009246 W JP 2004009246W WO 2005008646 A1 WO2005008646 A1 WO 2005008646A1
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WIPO (PCT)
Prior art keywords
recording
pulse
data
optical disc
mark
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PCT/JP2004/009246
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English (en)
Japanese (ja)
Inventor
Shuichi Tasaka
Kenji Koishi
Masaharu Imura
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Matsushita Electric Industrial Co., Ltd.
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Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to JP2005511806A priority Critical patent/JPWO2005008646A1/ja
Publication of WO2005008646A1 publication Critical patent/WO2005008646A1/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
    • G11B7/00456—Recording strategies, e.g. pulse sequences

Definitions

  • the present invention relates to a technique for recording data on a recordable optical disc, and more particularly to a method for determining a recording strategy that is a condition required for a recording pulse based on a recording pattern.
  • optical information recording technology that is, data recording technology for recordable optical disks
  • various types of optical recording / reproducing devices that is, optical disk recording / reproducing devices
  • those applied as external recording devices for computers, such as DVD-RAM drives, for example have already begun to spread widely.
  • Recordable optical disks are classified into write-once optical disks and rewritable optical disks.
  • a write-once optical disc is an optical disc on which data can be recorded only once, and includes CDR (Recordable) and DVDR.
  • Creation of a recording mark on a write-once optical disc is performed as follows.
  • the recording layer of the write-once optical disc contains an organic dye, and the organic dye is decomposed when irradiated with a laser having a predetermined power. As a result, especially the optical reflectivity decreases. Thus, the portion of the recording layer that has been irradiated with the laser becomes a recording mark.
  • a rewritable optical disk refers to an optical disk on which data can be rewritten and recorded many times, and includes CD-RW (Rewrite Table), DVD-RAM, DVD-RW, DVD + RW, and the like.
  • the recording layer of a phase-change optical disc contains an alloy having two types of solid phases, a crystalline phase and an amorphous phase.
  • the optical reflectance of the recording layer is high in the crystalline phase and low in the amorphous phase. Therefore, the amorphous phase portion of the recording layer becomes a recording mark.
  • the creation of a recording mark that is, the transition from a crystalline phase to an amorphous phase, is realized as follows.
  • the recording layer is pulsed with a relatively high power laser.
  • a narrow area of the recording layer is instantaneously heated to a temperature above the melting point, and immediately thereafter, rapidly cooled to a temperature below the vitrification point. As a result, that narrow area of the recording layer is transformed into an amorphous phase.
  • the recording mark is the amorphous phase portion of the recording layer as described above. Therefore, in order to erase the recording mark, the transition from the amorphous phase to the crystalline phase may be performed within the range of the recording mark.
  • the transition from the amorphous phase to the crystalline phase is realized as follows.
  • a recording layer of a rotating rewritable optical disk is irradiated with a relatively low-power laser for a relatively long time. As a result, a wide area of the recording layer is heated to a temperature higher than the vitrification point and not exceeding the melting point. At that time, the area of the heated recording layer cools slowly after heating.
  • the existing recording marks can be erased on the rewritable optical disk.
  • the laser Irradiation is performed while switching between power and low power.
  • the recording mark can be erased and created at the same time, and the data can be overwritten on the optical disk.
  • FIG. 7 is a block diagram showing a configuration example of a conventional optical disk recording / reproducing apparatus.
  • the optical disk 30 is rotated around its central axis by a spindle motor 14.
  • the optical head that is, the pickup 1 irradiates a laser beam to the optical disk 30 and converts the reflected light into an analog signal in the following manner.
  • the semiconductor laser 1a outputs a laser having a predetermined power.
  • the power (reproduction power) at that time is small enough not to change the recording layer of the optical disc 30.
  • the laser R 1 output from the semiconductor laser 1 a focuses on the recording layer of the optical disk 30 through the condenser lens 1 b, the beam splitter 1 c, and the objective lens 1 d.
  • the laser R1 is reflected by the recording layer of the optical disc 30, and the reflected laser R2 passes through the objective lens 1d, is reflected by the beam splitter 1c, and passes through the detection lens 1e. Focus on the photodetector 1f.
  • the photodetector 1 detects the intensity of the reflected laser R2 and converts it into an analog signal d1. Then, the amplitude of the analog signal dl is substantially proportional to the intensity of the reflected laser R2.
  • the pickup 1 is moved in the radial direction of the optical disk 30 by a stepping motor (not shown). Thereby, the focus of the laser R1 output from the semiconductor laser la is moved in the radial direction of the optical disc 30.
  • the head amplifier 2 amplifies the analog signal d1 from the pickup 1 and outputs the analog signal d2 to the equalizer 3.
  • the equalizer 3 shapes the waveform of the analog signal d2 from the head amp 2.
  • Binarization section 4 The obtained analog signal d3 is compared with a predetermined threshold value, and is binarized based on the threshold value. Thereby, the analog signal d3 is converted into a digital signal d4.
  • a phase locked loop (PLL) circuit 5 synchronizes the digital signal d4 with a predetermined clock signal, and data is demodulated from the digital signal d5 synchronized with the clock signal.
  • PLL phase locked loop
  • the recording pattern determination unit 8 determines a recording pattern according to data to be recorded on the optical disc 30.
  • the recording pattern refers to a rectangular pulse train having a constant height.
  • the pulse width of each recording pattern indicates the length of the recording mark (mark length), and the pulse interval indicates the length of the recording space (space length).
  • the recording pulse determining unit 9 determines the recording pulse d9 based on the recording pattern d8 determined by the recording pattern determining unit 8.
  • the recording pulse is a rectangular pulse substantially the same as the laser pulse output from the semiconductor laser 1a.
  • the waveform of the recording pulse d9 is different from the waveform of the recording pattern d8, as described later.
  • the recording pulse d9 is determined according to certain conditions based on the recording pattern d8.
  • the certain condition is called a write strategy, and also a write pulse condition or a write pulse structure. Details of the recording strategy will be described later.
  • the recording power determining unit 12 determines the laser power of the semiconductor laser 1a during data recording. The value of the power thus determined is called the recording power.
  • the determined recording power d 12 is output to the laser drive unit 13.
  • the laser drive unit 13 controls a drive current d13 to the semiconductor laser 1a. As a result, the drive current d 13 flows through the semiconductor laser la with a magnitude corresponding to the recording power d 12. As a result, the semiconductor laser 1a has a recording power d A laser R 1 having a power equivalent to 1 2 is output.
  • the shape of the recording mark formed by laser irradiation cannot be uniquely determined only by the recording pulse and recording power.
  • the cooling rate of the recording layer depends on the ambient temperature during recording.
  • the wavelength of the semiconductor laser fluctuates substantially in proportion to the temperature fluctuation of the semiconductor laser. For example, D V D—
  • the fluctuation of the laser wavelength fluctuates the absorption energy by the recording layer.
  • the laser wavelength of the semiconductor laser, the structure of the optical disk, and the like usually vary around the standard value for each product.
  • the shape of the recording mark fluctuates due to the above-mentioned fluctuation factors. Therefore, simply determining the recording pulse and the recording power according to the standard recording strategy and recording power conditions does not sufficiently increase the accuracy of the recording mark shaping, particularly the positioning accuracy of the edge. As a result, the error rate of the actually recorded data cannot be sufficiently reduced. Therefore, the recording strategy is corrected for each optical disk and optical disk recording / reproducing device, and the recording power is corrected. Thereby, the optimum recording pulse and recording power are determined.
  • a conventional optical disc recording / reproducing apparatus has, for example, the following configuration for the purpose of correcting a recording strategy and calibrating a recording strategy.
  • the / 3 value calculator 11 calculates the asymmetry (] 3) value of the analog signal d2 from the head amplifier 2.
  • the ternary value of the analog signal is defined by the following expression by the maximum value a and the minimum value b of the analog signal.
  • the value is the center value of the analog signal waveform in the vertical direction ((a + b) / This is equivalent to 2) normalized by amplitude (a-b), and represents the quality of the reproduced signal.
  • the three values of the analog signal are parameters for determining the recording power of the semiconductor laser la as follows.
  • the analog signal d 1 reproduced by the pickup 1 is binarized by a binarizing unit 4 at a predetermined threshold.
  • the reproduction accuracy of the original digital data decreases. That is, the error rate of digital data changes depending on the three values. Therefore, the three values of the analog signal d1 must be selected to be optimum values so that the error rate is equal to or less than a predetermined allowable value.
  • the value of the analog signal d 1 is substantially determined by the optical reflectivity and shape of the recording mark on the optical disk 30, it is determined by the recording power of the laser R 1 emitted from the semiconductor laser 1 a. Conversely, if the value of the analog signal d1 is determined, the corresponding recording power can be determined.
  • the correspondence between the / 3 value of the analog signal and the recording power is called the recording power condition.
  • the optical disc 30 records the history of the recording strategy and the recording power condition in the data recording performed in the past, together with the standard recording strategy and the standard recording power condition defined in the standard.
  • the recording strategy demodulation unit 6 demodulates the recording strategy d6 from the digital signal d5 output from the PLL circuit 5, and outputs the demodulation strategy d6 to the recording strategy correction unit 7.
  • the recording power condition demodulation unit 10 demodulates the recording power condition d 10 from the digital signal d 5 and outputs it to the recording power determination unit 12.
  • the jitter detector 15 receives the digital signal d 4 a from the binarizer 4 and the deviation of the digital signal d 4 from the clock signal from the PLL circuit 5, that is, the digital signal d 4 Detect the jitter d 15 a at the leading edge of the pulse and the jitter d 15 b at the trailing edge of the pulse, and record them. Output to the edge correction unit 7.
  • the recording strategy correction unit 7 stores the input recording strategy d6 in the internal memory, and when correcting the stored recording strategy, sets the digital signal d4 at the leading end of the pulse of the digital signal d4 and the pulse d15a after the pulse. The edge d 15 b at each end is compared to the respective limits.
  • the recording strategy correction unit 7 stores the comparison result in association with the currently stored recording strategy. After that, the recording strategy correction unit 7 corrects the recording strategy by a predetermined correction value, and after the correction, stores the recording strategy d7 and outputs it to the recording pulse determination unit 9.
  • FIG. 8 shows the relationship between the recording pattern d8, recording pulse d9, laser pulse LP, and recording mask RM when recording is performed at the same speed using DVD-R as the optical disk 30.
  • the unit of each pulse width is represented by T.
  • the unit length T corresponds to one cycle (clock cycle) of the peak signal.
  • both the pulse width and the pulse interval of the recording pattern are set to substantially an integral multiple of the clock period T.
  • the heat generated by the laser diffuses from the irradiated portion to the surroundings. Heat particularly propagates back and forth along the DVD-R group. Furthermore, in DVD-R, both the mark length and the space length are short. Therefore, if the waveform of the laser pulse is made substantially the same as the recording pattern, the heat of the laser diffuses from the irradiated portion, and a recording mark is formed in a wider area than the irradiated portion. In addition, heat can easily travel through the recording space to the previous and next recording marks. As a result, the shape of the recording mark is distorted.
  • a recording pulse has been conventionally set as follows.
  • a recording pulse train composed of shorter pulses was made to correspond to one pulse of the recording pattern. This reduced the amount of heat applied to the DVD-R recording layer from the laser pulse when forming one recording mark.
  • the leading pulse of the recording pulse d 9, that is, the falling of the top pulse P 10 (pulse width T tl), Generally fixed at the position of the shortest pulse width 3 T1 from the front end of the pulse of the recording pattern d8.
  • a pulse of 1T1 cycle (logic "L” period is Sm, logic "H” period is Tm), that is, multi-pulse It consists of columns P 1 1.
  • the trailing end of the multi-pulse train P11 and the trailing end of the pulse P1 of the recording pattern d8 substantially coincide.
  • the trailing edge coincides with the falling edge of the top pulse P20.
  • the leading end of the top pulse P20 is set to be delayed by a predetermined length (hereinafter referred to as a leading end delay) F2 from the leading end of the pulse P2 of the recording pattern d8.
  • the top pulse P 20 is shorter than the shortest recording pattern length 3 T 1 of the recording pattern d 8. Note that the leading end delay of the top pulse P10 is F1.
  • a laser pulse LP from the semiconductor laser 1a is applied with substantially the same waveform as the recording pulse d9.
  • the waveform of the laser pulse LP at that time is, as shown in FIG. 8, the laser pulse 5 3
  • the laser pulse train 54 corresponds to the multi-pulse train
  • the laser pulse 55 corresponds to the top pulse P20.
  • the peak value L1 of the laser pulse LP indicates the recording power of the laser.
  • a row of recording marks M and recording spaces S as shown in FIG. 8 is formed on the recording layer of the optical disc 30 as a recording mark pattern RM.
  • the recording pattern d8 and the row of the recording marks M and the recording spaces S correspond well.
  • FIG. 9 shows the relationship between the recording pattern d8, recording pulse d9, laser pulse LP, and recording mark pattern RM when recording was also performed at 4 ⁇ speed using DVD-R as the optical disk 30.
  • the recording pattern length is 7 T 2 (5 T 2 or more), as in the case of the pulse ⁇ 1 of the recording pattern d 8 shown in FIG. 9, not only the same multi-pulse method as the 1 ⁇ speed recording pulse but also the recording pattern
  • the top pulse P10 (rising P10a, falling P10b, pulse width Ttop) and the last pulse P11 (rising P11a, falling P11) b, a pulse width T1ast) and a recording pulse d9 consisting of a DC pulse (P10b to PI1a) are also employed.
  • the recording pulse is only the top pulse 20 (rising P20a, falling P20b, and pulse width Tt2).
  • the pulse width becomes 1Z4 compared to the 1 ⁇ speed recording pulse, so that the rise and fall of the laser pulse LP affect the formation of the recording mark.
  • No pulse train is used.
  • the width of the multi-pulse train was controlled.
  • the level L m1 of DC power 64 with respect to the peak value Lo 1 of the laser pulse LP, Reduces the amount of heat applied to the DVD-R recording layer. As a result, formation of an excessively large recording mark and excessive transmission of heat to other recording marks can be prevented.
  • the last pulse of the laser pulse LP that is, the last pulse 65 is controlled by the same recording power L01 as the top pulse 63. ing.
  • the falling of the last pulse 65 substantially coincides with the falling position P 1b of the pulse P 1 of the recording pattern.
  • the pulse of the recording pattern d8 is the shortest pulse 3T2, as in P2 in FIG. 9, the pulse P2 of the recording pattern d8 falls at a single pulse as in the case of the normal speed.
  • the fall of the top pulse 66 of the laser pulse LP with respect to the position P 2 b is slightly delayed by about 0.2 T 2.
  • the front end delay F 2 of the top pulse P 20 is set to about 1 T 2.
  • the pulse width T t2 of the top pulse P 20 is shorter than the shortest pulse width 3 T 2 of the recording pattern d8.
  • the waveform of the laser pulse LP is as shown in FIG.
  • a row of recording marks M and recording spaces S as shown in FIG. 9 is formed on the recording layer of the optical disc 30 as a recording mark pattern RM.
  • the recording pattern d8 and the row of the recording mark M and the recording space S correspond well as in the case of the normal speed.
  • the condition for determining the waveform of the corresponding recording pulse, particularly the position of both ends of the pulse, based on the mark length and the space length of the recording pattern is referred to as a recording strategy.
  • a recording strategy for DVD-R and DVD-RW is a condition for determining the following (a), (b), and (c).
  • the recording strategy for the DVD-RAM includes the conditions for (b) above and (d) the last end of the multi-pulse train or the last end of the last pulse following the multi-pulse train, and the corresponding pulse of the recording pattern. Includes the condition for the amount to advance from the rear end (rear end advance). '
  • the recording strategy and the recording power condition to be set for each of the recording pulse determination unit 9 and the recording power determination unit 12 must be determined at the start of data recording. No.
  • a standard recording strategy and a standard recording power condition are recorded on the optical disc 30 in advance. Further, a history of recording strategy and recording power conditions at the time of recording performed in the past is recorded.
  • the conventional optical disk recording / reproducing apparatus at the start of data recording, first, one of each of the recording strategy and the recording power condition recorded on the optical disk 30 is selected, and the data is read from the optical disk 30 as an initial condition. . The reading is the same as the normal data reading.
  • the analog signal d 1 from the pickup 1 is converted into a digital signal d 5 through the head amplifier 2, the equalizer 3, the binarizing unit 4 and the PLL circuit 5.
  • the recording strategy demodulator 6 demodulates the recording strategy of the initial condition
  • the recording power condition demodulator 10 demodulates the recording power condition of the initial condition.
  • the demodulated recording strategy d6 is output to the recording strategy correction unit 7, where it is stored. Further, the demodulated recording strategy d 6 passes through the recording strategy correction unit 7. Then, it is input to the recording pulse determination unit 9.
  • the demodulated recording power condition dl O is input to the recording power determining unit 12.
  • FIG. 10 shows a recording pattern d8 and a recording pulse d9 when a DVD-R is used as the optical disk 30 and the recording strategy at 4 ⁇ speed shown in FIG. 9 is employed and recording is performed at 8 ⁇ speed.
  • FIG. 5 is a diagram showing a relationship between a laser pulse LP and a recording mark pattern RM.
  • the recording pattern d8 and the recording pulse d9 are substantially the same.
  • substantially the same shape means that the pulse width and pulse interval of the recording pattern d8 and the recording pulse d9 have the same numerical value when expressed in clock cycle units.
  • the recording patterns d8 and the recording pulses d9 are substantially the same, respectively, in FIG. 10, the portions corresponding to FIG. ing.
  • the unit length T3 of the pulse width in FIG. 10, that is, one cycle of the clock signal is equivalent to 1Z2 times the clock cycle in FIG. Therefore, the actual length of the recording pattern d8 and the recording pulse d9 is 1Z2 in FIG. 9 in FIG.
  • the rotation speed of the optical disk is twice that of Fig. 9 in Fig. 10.
  • the shape of the recording mark does not depend on the recording speed, only the recording phase is changed between Fig. 9 showing the case of 4x speed and Fig. 10 showing the case of 8x speed. You should get a record mark of the same shape.
  • the recording mark M1 shown in FIG. 10 is formed to extend in the radial direction of the optical disc 30. In other words, the required recording power increases in proportion to the linear velocity, but the recording mark Ml also spreads in the radial direction due to an increase in the irradiation power with respect to the recording track of the optical disk 30. Occurs.
  • the size of the laser beam spot is almost the same irrespective of the recording speed and recording power, but because the thermal energy increases, the recording mark M1 becomes larger around the surface, and the amount of reflected light also decreases.
  • the track groove shape undergoes plastic deformation (58 in Fig. 10) due to the heat of the laser, and the groove signal is diffracted.
  • the S / N of the wobble signal generated by light and the land pre-pit (hereinafter referred to as LPP) signal formed in the land part deteriorates, and the standard value cannot be satisfied.
  • the S / N is reduced by forming a recording mark after recording compared to the unrecorded state. It tends to decrease. The higher the power, the stronger the tendency.
  • ECC Error Correction Code
  • the magnitude of this waveform distortion is expressed as (B / A), where B is the amount of distortion with respect to amplitude A.
  • BZA the amount of distortion with respect to amplitude A.
  • the longer the recording mark the more the waveform distortion is likely to occur.
  • the recording power ratio L o 3 ZL m 3 is fixed regardless of the recording mark length, so even if the recording mark length is optimal at 6T3, the longer the recording mark length is 11T3 or more, the more the center Tend to lack heat.
  • L m 3 is increased and L 03 / L m 3 is decreased only for a long recording mark of 11 T 3 or more, the recording mark only spreads in the radial direction. This will worsen the error-wobble jitter. Disclosure of the invention
  • the present invention has been made in view of the above problems, and has as its object to reduce the waveform distortion of a recording mark that is difficult to spread in the radial direction and that is long in the circumferential direction even when performing high-speed data recording.
  • a short-term recording device and data recording on a recordable optical disc that can record data with high quality by determining a few optimal recording strategies and recording power conditions and securing a sufficient recording power margin. It is to provide a method.
  • a data recording apparatus for recording on a recordable optical disc comprises: a semiconductor laser for irradiating a laser on a recordable optical disc laser with a predetermined recording power; and a laser beam emitted from the semiconductor laser.
  • a laser driver for controlling the recording power and recording pulse width of the laser, and the recording power and recording pulse width of the recording pulse train required to form the recording mark according to the recordable optical disk, recording speed and recording mark length ,
  • a recording strategy setting unit for adding an assisting pulse at a position substantially equidistant from the front end pulse and the rear end pulse of an arbitrary recording pulse train.
  • a method of recording data on a recordable optical disc comprises the steps of: setting a recording speed as set recording speed information; and recording data according to the recording speed information and the recordable optical disc.
  • test recording is performed using a recording pulse train in which an auxiliary pulse is added between a top pulse and a last pulse, and the value and the modulation factor are set to an allowable value from the reproduction signal.
  • the value and the modulation factor are set to an allowable value from the reproduction signal.
  • FIG. 1 is a diagram showing data on a recordable optical disc according to Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram illustrating a configuration example of a DVD-R recorder as an example of an evening recording device.
  • FIG. 2 shows a recording pattern d8, a recording pulse d9, a laser pulse LP, a recording mark pattern RM, and a recording pattern when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the first embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a relationship between a reproduced signal RF and a pattern RM.
  • FIG. 3 is a flowchart showing a recording learning method according to the first embodiment of the present invention.
  • FIG. 4 shows a recording pattern d8, a recording pulse d9, a laser pulse LP, a recording mark pattern RM, and a recording mark when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the second embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a relationship between a reproduction signal RF and a pattern RM.
  • FIG. 5 shows a recording pattern d 8, a recording pulse d 9, a laser pulse LP, a recording mark pattern RM, and a recording mark when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the third embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a relationship between a reproduction signal RF and a pattern RM.
  • FIG. 6 shows a recording pattern d8, a recording pulse d9, a laser pulse LP, a recording mark pattern RM, and a recording mark when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the fourth embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a relationship between a reproduction signal RF and a pattern RM.
  • FIG. 7 is a block diagram showing a configuration example of a conventional optical disc recording / reproducing apparatus.
  • Fig. 8 is a diagram showing the relationship between the recording pattern d8, the recording pulse d9, the laser pulse LP, and the recording mark pattern RM when recording is performed at the same speed using a conventional optical disk recording / reproducing apparatus. is there.
  • Fig. 9 shows recording at 4x speed using a conventional optical disc recording / reproducing device.
  • Pi which indicates the relationship between the recording pattern d8, the recording pulse d9, the laser pulse LP, and the recording mark pattern RM when the recording is performed.
  • FIG. 10 shows the recording pattern d8, recording pulse d9, and recording pulse 8x when recording was performed at 8x speed using the conventional 4x recording strategy shown in Fig. 9 using a conventional optical disc recording and reproducing device.
  • FIG. 4 is a diagram showing a relationship between a laser pulse LP and a recording mark pattern RM.
  • FIG. 11 shows a case where a conventional optical disk recording / reproducing device is used to record at a recording mark longer than that shown in Fig. 10 at 8x speed by using the recording strategy at 4x speed shown in Fig. 9.
  • FIG. 9 is a diagram illustrating a relationship between a reproduction signal RF for a pattern d8, a recording pulse d9, a laser pulse LP, a recording mark pattern RM, and a recording mark pattern RM.
  • FIG. 1 is a block diagram showing a configuration example of a DVD-R recorder as an example of a data recording apparatus for recording on a recordable optical disc according to Embodiment 1 of the present invention.
  • FIG. 1 portions having the same configurations and functions as those in FIG. 7 referred to in the description of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.
  • the configuration mainly different from the conventional example will be described.
  • the DVD-R 30 is rotated about its central axis by spindle motor 14. At that time, the rotation speed of the spindle motor 14 is controlled so that the linear velocity of the DVD-R 30 is substantially always constant at the focal position of the laser R 1 from the pickup 1.
  • the linear velocity value is set to an integral multiple of the standard velocity of 3.49 mZs.
  • the recording strategy correction unit 7 corrects the recording strategy by a predetermined correction value according to the recording speed d 17 set by the recording speed setting unit 17.
  • the recording pattern determination unit 8 determines a recording pattern according to data to be recorded on the DVD-R 30.
  • the recording pattern is determined according to the mark edge recording method. That is, both ends of the pulse of the recording pattern correspond to both edges of the recording mark.
  • the recording pattern determination unit 8 modulates the data into a recording pattern by 8-to-16 conversion modulation. After the modulation, 1-bit data is allocated to one period (clock period) 1 T of the clock signal from the PLL circuit 5. As a result, the pulse width and pulse interval of the recording pattern are 3 to 11 and 14 respectively. Here, the pulse width and pulse interval of length 3T to 111 are used as data, and the pulse width and pulse interval of length 14 ⁇ are used as a synchronization signal. Further, the recording pattern determination unit 8 stores a test recording pattern at the time of recording strategy correction and at the time of recording power learning called OPC (Optimum Power Control) in an internal memory.
  • OPC Optimum Power Control
  • the recording pulse determining unit 9 determines the recording pulse d9 based on the recording pattern d8 determined by the recording pattern determining unit 8, according to a recording strategy.
  • the recording power determination unit 12 executes OPC based on the recording power condition at the start of title recording, calibrates the recording power based on the value d 11 from the / 3 value calculation unit 11, and performs reference recording. Determine the peak value of power P o 3 and DC level P m 3. Specifically, the recording power determination unit 12 executes OPC until the value becomes 0 to + 5%.
  • the waveform distortion detection unit 20 mainly detects the distortion of a long recording mark of 9 to 14 T in the analog signal d2 from the head amplifier 2. Specifically, a maximum value d20a of the amplitude of the analog signal d2 and a decrease d20b of the amplitude due to the distortion are detected and supplied to the distortion amount calculating unit 21. Calculation of distortion The output unit 21 calculates d 20 bZd 20 a as the amount of distortion from the maximum value d 20 a of the amplitude and the amount of decrease d 20 of the amplitude, determines the magnitude of the amount of distortion, and outputs the determination result d 21. I do.
  • the recording strategy setting unit 22 adds a middle pulse as an auxiliary pulse between the top pulse and the last pulse based on the determination result d21 from the distortion amount calculation unit 21, and, if added, the pulse width of the middle pulse. Is determined, and the information d 22 is sent to the recording power determining unit 12.
  • the recording power d12 determined by the recording power determination unit 12 is output to the laser driving unit 13.
  • the laser drive unit 13 controls a drive current d13 to the semiconductor laser 1a according to the recording power d12.
  • the semiconductor laser la emits a laser R1 having a power equivalent to the recording power d12 with substantially the same waveform as the recording pulse d9.
  • a row of recording marks and recording spaces substantially corresponding to the recording pattern d8 is formed on the recording layer of the DVD-R30.
  • FIG. 2 shows a recording pattern d8, a recording pulse d9, a laser pulse LP, a recording mark pattern RM, and a recording mark pattern RM when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the present embodiment.
  • FIG. 6 is a diagram showing a relationship of a reproduction signal RF to the reproduction signal RF.
  • the DVD-R recorder employs a recording strategy in which an auxiliary pulse is added as follows in accordance with the set recording speed.
  • the semiconductor laser la irradiates the DVD-R 30 with a laser pulse LP having a waveform based on the recording pulse d9.
  • the laser pulse LP at that time has a waveform as shown in FIG.
  • the peak value Lo 3 of the laser pulse LP and the DC power level Lm 3 represent the recording power of the laser, and the irradiation of the laser pulse LP produces a recording mark pattern RM as shown in FIG.
  • a row of marks M3 and recording spaces S3 is formed on the recording layer of DVD-R30.
  • FIG. 2 it is clear from comparison of the recording pattern d8 and the recording mark pattern RM that both ends of the recording pattern d8 and both edges of the recording mark M3 correspond well.
  • a middle pulse P82 having the same recording power Po3 as the top pulse P80 and the last pulse P81 of the recording pulse d9 is used.
  • the pulse width Tmid of the middle pulse P82 is set to a short time of about 1 T3 to 2 T3.
  • the recording mark M3 obtained by the recording strategy at 8 ⁇ speed approaches the recording mark M (FIG. 8) obtained by the recording strategy at 1 ⁇ speed. Therefore, as shown by M a3, the radial distortion of the recording mark M3 can be reduced. Further, the waveform distortion of the reproduction signal RF with respect to the recording mark M3 can be improved from the broken line to the solid line in FIG.
  • DVD-R30 is mounted on the DVD-R recorder (step S1). After detecting the mounting of DVD-R30, if the DVD-R30 is rotated by spindle mode 14, the pickup 1 refers to the LPP information and RMA (Recording Management Area) of DVD-R30, and the RMD Read (Recording Management Data) (Step S 2).
  • the user of the DVD-R recorder sets the recording speed using the recording speed setting section 17 (step S3). Specifically, a positive integer indicating the magnification of the set recording speed with respect to the standard recording speed of 3.49 m / s is input as the set recording speed information.
  • Step S4 is performed as follows.
  • OPC is executed based on the recording power conditions based on the recommended recording strategy read from LPP and RMA according to the set recording speed.
  • the recording pattern determination unit 8 outputs a test recording pattern d8 different from the above.
  • the recording pulse determination unit 9 determines a test recording pulse d9 from the test recording pattern d8.
  • the recording power determination unit 12 sets the recording power corresponding to the test recording pulse d9 to a predetermined initial value. At that time, the initial value is determined as follows. First, the recording power corresponding to the target three values is selected from the recording power conditions. For example, suppose that the peak value P 03 of the recording power is 16. OmW.
  • the initial value of the recording power is set to a value smaller by a predetermined value than the recording power corresponding to the target ⁇ value.
  • the predetermined value is 2. OmW
  • the initial value will be 14. OmW.
  • the target j3 value is set in advance for each type of DVD-R 30 for a DVD-R recorder, for example. By the setting, the error rate of the reproduced digital signal is suppressed to a predetermined allowable value or less.
  • the target j3 value may be recorded in the RMA of DVD-R30.
  • the value of the DC level Pm3 of the recording power exists as the recommended recording strategy information read from the LPP and RMA, so that the recording power ratio Po3ZPm3 is determined here.
  • the laser driving unit 13 drives the semiconductor laser 1a, and the semiconductor laser 1a emits a laser R1 having a power corresponding to the recording power d12. in addition As a result, a test recording mark is formed in the PCA (Power Calibration Area) of DVD-R30.
  • PCA Power Calibration Area
  • the pickup 1 irradiates a laser of reproducing power to the test recording mark of the PCA and detects the reflected light.
  • the detected reflected light is converted into an analog signal d 1 and further shaped through a head amplifier 2 and an equalizer 3.
  • the ⁇ value calculator 11 calculates a / 3 value d 11 based on the analog signal d 2 from the head amplifier 2 (step S5).
  • three values d 11 are stored in the recording strategy setting unit 22. Thereafter, the recording power is changed from the initial value by a predetermined step, and the above process is repeated. For example, if the initial value is 14. OmW and the step is 0.5 mW, the recording power set next to the initial value is 14.5 mW.
  • the three values of the analog signal reproduced from the test recording mark are calculated and stored.
  • a correspondence table between the number of recording power changes (the number of steps) and the calculated three values, that is, a new recording power condition is obtained.
  • the correspondence table shows that the initial values are 14.OmW (step number 0), 14.5 mW (step number 1), 15.0 mW (step number 2), ..., 18.8 OmW (step number) (Corresponding to each of the recording powers different by 0.5 mW, as in Expression 8))
  • the three values are stored in association with the step numbers 0 to 8.
  • a reference recording power P o3 corresponding to the target (three) values is selected (step S6).
  • the waveform distortion detector 20 reads the waveform distortion amount 7? Of the reproduction signal RF for the test recording mark formed at the selected recording power (step S7).
  • the distortion detecting section 20 detects distortion of a reproduced signal mainly for a long recording mark of 9T3 to 14T3 in the analog signal d2 from the head amplifier 2. Put out.
  • the fixed value of the auxiliary pulse is added as an initial value (step S9).
  • a pulse P82 having a peak value of recording power Po3 and a pulse width of a fixed width of Tmid is added.
  • an auxiliary pulse having a pulse width Tmid 1 T3 is added.
  • the pulse width here may be a value that is considered to be optimal based on experiments, stored in advance in the memory of the recording device, and may be called from the memory for each media ID.
  • step S8 if the waveform distortion amount 7? Is 10% or less, it is determined that the auxiliary pulse is unnecessary (step S10), and the recording learning ends. Therefore, title recording starts without the auxiliary pulse.
  • Step S11 Read the amount of waveform distortion?
  • step S8 the distortion amount calculator 21 calculates the waveform distortion amount 77 Small is determined (step S12), and if the waveform distortion amount 77 is 10% or less (YES), the recording learning is terminated. Therefore, an auxiliary pulse of the initial set value (initial pulse width) is added, and title recording starts.
  • step S12 determines whether the waveform distortion amount 77 is still larger than 10% (NO)
  • the set value (pulse width Tm id) of the auxiliary pulse is changed again to set the specified value 10 0 Steps S11 to S13 are repeated until% is satisfied. Similarly, after completing the record study, the title record starts.
  • a recording mark with less distortion can be formed by adding an auxiliary pulse even during high-speed recording. As a result, the error rate of data recorded at a high recording speed can be reduced.
  • the DVD-R recorder employs, as in the first embodiment, a recording strategy in which an auxiliary pulse is added as follows in accordance with the set recording speed, and the block configuration shown in FIG. Take.
  • FIG. 4 shows a recording pattern d8, a recording pulse d9, a laser pulse LP, a recording mark pattern RM, and a recording mark when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the second embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a relationship between a reproduction signal RF and a pattern RM.
  • T 3 is equivalent to 1Z8 of the clock period T at the 1 ⁇ speed (TS TZS
  • the auxiliary pulse is a single pulse, but in the present embodiment, For example, as shown in Fig.
  • an auxiliary pulse P30 composed of a two-pulse train is added.
  • the waveform distortion amount 7 of the reproduction signal RF is changed by changing the pulse width Tmid of the auxiliary pulse.
  • the number of auxiliary pulses is increased, and the number of auxiliary pulses is increased or decreased, so that the waveform distortion amount 7 can be controlled.
  • the pulse width of the auxiliary pulse is changed in step S13 of the flowchart in FIG. 3, but in the present embodiment, by increasing the number of pulses of the auxiliary pulse, the reproduction signal RF is increased. It differs in controlling the amount of waveform distortion 7 ?.
  • the DVD-R recorder employs a recording strategy in which an auxiliary pulse is added as described below in accordance with the set recording speed, as in the first embodiment, and the block configuration shown in FIG. Take.
  • FIG. 5 shows a recording pattern d 8, a recording pulse d 9, a laser pulse LP, a recording mark pattern RM, and a recording mark when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the third embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a relationship between a reproduction signal RF and a pattern RM.
  • the auxiliary pulse ⁇ 82 is the top pulse ⁇ 80
  • the last pulse was formed in the middle part of ⁇ 81.
  • the amount of heat of the auxiliary pulse may affect the recording mark length. That is, the leading edge (or trailing edge) may be long, and it is necessary to change the rising position (or falling position) of the auxiliary pulse depending on the optical disc.
  • the rising position of auxiliary pulse ⁇ 82 By changing the position P82a (or the fall position P82b) and forming the auxiliary pulse P82 at a position where the recording mark length does not easily change, the waveform distortion of the reproduced signal RF is maintained while the jitter is good. Can be reduced.
  • the pulse width of the auxiliary pulse is changed in step S13 of the flowchart of FIG. 3, but in the present embodiment, the rising edge P82a (or the falling edge) of the auxiliary pulse P82a is changed.
  • the difference is that the amount of waveform distortion of the reproduced signal RF is controlled by changing the time up to P82 b).
  • FIG. 6 shows a recording pattern d8, a recording pulse d9, a laser pulse LP, a recording mark pattern RM, and a recording mark when recording is performed at 8 ⁇ speed using the DVD-R recorder according to the fourth embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a relationship between a reproduction signal RF and a pattern RM.
  • the recording power L ⁇ 3 of the auxiliary pulse ⁇ 82 is set to the same recording power L ⁇ 3 as the top pulse ⁇ 80 and the last pulse ⁇ 81. The power may increase and the laser pulse LP waveform may not reach the level of Lo 3.
  • the auxiliary pulse P 8 By setting the recording power P o 4 of 2, stable recording characteristics can be ensured even when performing higher-speed recording.
  • the recording power Po4 of the auxiliary pulse P82 higher than the recording power Po3 of the top pulse P80 and the last pulse P81.
  • the pulse width of the auxiliary pulse is changed in step S13 of the flowchart of FIG. 3, but in the present embodiment, by changing the recording power Po4 of the auxiliary pulse P82, It differs in controlling waveform distortion.
  • the heat energy per unit time at the center of a recording mark can be increased by adding an auxiliary pulse when recording data at a high speed on an optical disc.
  • the recording mark in the radial direction of the optical disc is reduced due to lack of heat, and the waveform distortion of the reproduced signal due to the recording mark shape can be reduced. Deterioration can be controlled.

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  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un dispositif d'enregistrement de données permettant de d'enregistrer des données sur un disque optique enregistrable dans lequel la marque d'enregistrement possède moins de distorsion de forme et la distorsion de l'onde de forme du signal de reproduction est réduite. Une section de détermination de la stratégie d'enregistrement (22) détermine, dans une section de décision de puissance d'enregistrement (12), une stratégie d'enregistrement permettant d'ajouter une impulsion auxiliaire entre l'impulsion supérieure et la dernière impulsion de l'impulsion d'enregistrement conformément au taux de distorsion de l'onde de forme du signal de reproduction lorsqu'une vitesse d'enregistrement élevée telle qu'une vitesse multipliée par 8 est déterminée par un utilisateur. Par conséquent, il est possible d'augmenter l'énergie thermique par unité de temps dans la partie centrale de la marque d'enregistrement et de supprimer la distorsion de l'onde de forme de reproduction causée par la réduction de la marque d'enregistrement dans la direction radiale du disque optique en raison du déficit thermique et de la déformation de la marque d'enregistrement en une forme de tambour manuel.
PCT/JP2004/009246 2003-06-25 2004-06-23 Dispositif et procede permettant de d'enregistrer des donnees sur un disque optique enregistrable WO2005008646A1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006286174A (ja) * 2005-03-10 2006-10-19 Ricoh Co Ltd 色素系追記型ｄｖｄ媒体の記録再生方法及びその記録再生装置
WO2008053544A1 (fr) * 2006-10-31 2008-05-08 Pioneer Corporation Procédé, dispositif et programme informatique d'enregistrement d'informations
WO2008053540A1 (fr) * 2006-10-31 2008-05-08 Pioneer Corporation Dispositif d'enregistrement de données, procédé et programme d'ordinateur
JP2009245592A (ja) * 2009-07-31 2009-10-22 Taiyo Yuden Co Ltd 光ディスク記録方法、光ディスク記録再生装置及び光ディスク

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI395210B (zh) * 2005-09-23 2013-05-01 Marvell World Trade Ltd 寫入策略校準系統以及包括該系統之光學媒體重播裝置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001184651A (ja) * 1999-12-27 2001-07-06 Ricoh Co Ltd 相変化型情報記録媒体およびその記録方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001184651A (ja) * 1999-12-27 2001-07-06 Ricoh Co Ltd 相変化型情報記録媒体およびその記録方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006286174A (ja) * 2005-03-10 2006-10-19 Ricoh Co Ltd 色素系追記型ｄｖｄ媒体の記録再生方法及びその記録再生装置
JP4481943B2 (ja) * 2005-03-10 2010-06-16 株式会社リコー 色素系追記型ｄｖｄ媒体の記録再生方法及びその記録再生装置
WO2008053544A1 (fr) * 2006-10-31 2008-05-08 Pioneer Corporation Procédé, dispositif et programme informatique d'enregistrement d'informations
WO2008053540A1 (fr) * 2006-10-31 2008-05-08 Pioneer Corporation Dispositif d'enregistrement de données, procédé et programme d'ordinateur
US7974164B2 (en) 2006-10-31 2011-07-05 Pioneer Corporation Information recording apparatus and method, and computer program
JP2009245592A (ja) * 2009-07-31 2009-10-22 Taiyo Yuden Co Ltd 光ディスク記録方法、光ディスク記録再生装置及び光ディスク

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