WO2005029479A1 - 記録再生方法および記録再生装置 - Google Patents
記録再生方法および記録再生装置 Download PDFInfo
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- WO2005029479A1 WO2005029479A1 PCT/JP2004/014042 JP2004014042W WO2005029479A1 WO 2005029479 A1 WO2005029479 A1 WO 2005029479A1 JP 2004014042 W JP2004014042 W JP 2004014042W WO 2005029479 A1 WO2005029479 A1 WO 2005029479A1
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- recording
- reproducing
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0945—Methods for initialising servos, start-up sequences
-
- 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
- G11B7/005—Reproducing
-
- 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
Definitions
- An object of the present invention is to realize a stable recording / reproducing system in an optical disc system that irradiates a laser beam to record / reproduce information, taking into account variations in track circumference such as track width and reflectivity.
- the present invention relates to a method and an apparatus for optimizing recording and reproduction conditions.
- an optical disk drive that records and plays back optical disks (also in this case, optical heads such as the laser wavelength and the sensitivity of the light-receiving element that receives the reflected light from the disk, and other services such as focus control and tracking control)
- optical heads such as the laser wavelength and the sensitivity of the light-receiving element that receives the reflected light from the disk, and other services such as focus control and tracking control
- the control accuracy etc. That is, even if the recording state is set to the same value such as the recording power / support control, a situation may occur in which the recording sensitivity changes due to individual differences between the optical disk and the optical disk recording / reproducing device.
- Calibration is a method for ensuring the signal quality of user data, such as recording pulse or pulse shape. This is control for performing optimization.
- the general recording proofreading operation is performed by a test report provided on the inner periphery, such as a DVD-RAM. This is performed using the region to be monitored.
- An example of the recording power calibration operation of the optical disk will be described with reference to FIG.
- 101 is an optical disk
- 102 is a user data overnight area
- 103 is a PCA (Power Calibrati on Area) area
- 104 is a PIC (Peermanent Infomation and Control data). ) Area.
- the user data overnight area 102 is an area for recording data information.
- the PCA area 103 is provided as a test writing area on the inner periphery of the user data area 102, and the number of times of use and the recording start position are not limited.
- FIG. 1B shows a signal level indicating a signal change of the amount of reflected light of the optical disk 101 with respect to the recording power.
- the recording power described in the PIC area 104 is changed stepwise, the RF signal level for each recording power is detected, and the state is changed according to the state change such as the modulation index.
- the optimum power for recording in the user data area 102 is determined.
- Japanese Patent Application Laid-Open No. 2002-170236 is an example of a conventional technique utilizing the recording power calibration operation.
- the above prior art example is optimized by replacing a part of a recording pulse train with a detection pulse, recording the data in sector units, and calculating a modulation degree change of each pulse using each value obtained by sampling an RF signal by a sampling circuit. This is a technique for calculating the optimum recording power.
- a rewritable optical disc such as a DVD-RAM generally has a sector structure, and a recording operation is performed in sector units.
- the reflectivity may fluctuate around the track due to scratches on the track, dust on the surface of the optical disc, or variations in the thickness of the recording layer or reflective layer during manufacturing. That is, when the reflectance in all or some of the sectors for which the degree of modulation is detected has changed from a predetermined value, the amount of light reflected from the optical disk changes. Degree is not accurately detected. As a result, the recording power finally calculated by the modulation factor can be higher or lower than the desired optimum recording power. ⁇
- an index value of the reproduction signal quality including the modulation factor is detected on average, and a more stable recording power or other recording / reproduction conditions are calculated. It is an object of the present invention to provide a method and an apparatus for optimizing the recording and reproducing conditions of an optical disk with high reliability. Disclosure of the invention
- the recording / reproducing method of the present invention is a recording / reproducing method for recording information on an optical disk or reproducing information recorded on the optical disk, wherein the recording / reproducing conditions are stepwise and monotonically performed m times.
- M is an integer of 2 or more
- n is an integer of 2 or more
- mX n reproduced from the optical disk.
- the recording / reproducing apparatus of the present invention is a recording / reproducing apparatus for recording information on an optical disk or reproducing information recorded on the optical disk, wherein the optical head irradiates the optical disk with laser light, A laser light controller for controlling light, a light head controller for controlling the light head, and stepwise and monotonically changing recording / reproducing conditions m times (m is an integer of 2 or more)
- the laser light control unit and the optical head control unit are configured to repeat one of the recording operation and the reproducing operation on the optical disk n times (n is an integer of 2 or more) while performing the operation.
- the optical disc controller determines an optimal recording / reproducing condition based on the m averaged index values, and performs at least one of a recording operation and a reproducing operation on the optical disc in accordance with the optimal recording / reproducing condition.
- the laser light control section and the optical head control section are controlled so as to perform an operation, whereby the object is achieved.
- FIG. 1 is a diagram illustrating an example of a recording calibration operation.
- FIG. 2 is a configuration diagram of the optical disc in the present embodiment.
- FIG. 3 is an explanatory diagram of a track shape in the present embodiment.
- FIG. 4 is an explanatory diagram of the recording pulse waveform and the recording power in the present embodiment.
- FIG. 5 is a schematic diagram of a recording track in the present embodiment. '
- FIG. 6 is a diagram showing a change in recording power and a reproduction signal from a recording track in the present embodiment.
- FIG. 7 is a diagram showing a relationship between the modulation factor characteristic and the target modulation factor with respect to the recording power in the present embodiment.
- FIG. 8 is a flowchart showing the recording power deriving operation based on the modulation factor in the present embodiment.
- FIG. 9 is a block diagram of the recording / reproducing apparatus according to the present embodiment.
- FIG. 10 is a block diagram illustrating use of a signal processing circuit in the recording / reproducing apparatus according to the present embodiment.
- FIG. 11 is a block diagram illustrating an example in which the signal processing circuit is not used in the recording / reproducing apparatus according to the present embodiment.
- FIG. 12 is a diagram illustrating asymmetry characteristics with respect to a recording sequence in the present embodiment.
- FIG. 13 shows an operation of deriving a recording pattern by asymmetry according to the present embodiment.
- FIG. 14 is a diagram illustrating jitter characteristics with respect to recording power in the present embodiment.
- FIG. 15 is a flowchart showing the recording power deriving operation based on jitter in the present embodiment.
- FIG. 16 is a diagram illustrating edge shift and pulse adjustment of a recording mark according to the present embodiment.
- FIG. 17 is a diagram illustrating a shift characteristic with respect to the correction amount of the recording pulse in the present embodiment.
- FIG. 18 is a flowchart showing a recording pulse condition deriving operation by shifting according to the present embodiment.
- FIG. 19 is a flowchart showing a tilt control operation at the time of reproduction due to a zip in the present embodiment.
- FIG. 20 is a flowchart showing a tilt control operation at the time of recording due to jitter in the present embodiment.
- FIG. 21 is a flowchart showing a tracking control operation at the time of reproduction according to the present embodiment in the present embodiment.
- FIG. 22 is a flowchart showing a tracking control operation at the time of recording due to jitter in the present embodiment.
- FIG. 23 is a flowchart showing a focus control operation at the time of reproduction according to the present embodiment in the present embodiment.
- FIG. 24 is a flowchart showing a focus control operation at the time of recording according to the embodiment of the present invention.
- FIG. 25 is a flowchart showing a spherical aberration correction control operation at the time of reproduction due to jitter in the present embodiment.
- FIG. 26 shows the spherical aberration correction control operation at the time of recording according to the present embodiment. It is a flowchart showing.
- FIG. 27 is a flowchart showing the operation of controlling the frequency characteristic of the waveform equalizer using jitter in the present embodiment.
- FIG. 28 is a diagram showing a change in recording power in the present embodiment.
- FIG. 29 is a diagram showing a change in recording power in the present embodiment.
- FIG. 30 is a diagram showing a change in recording power and a reproduced signal from a recording track in the present embodiment.
- FIG. 31 is a diagram showing a change in recording power in the present embodiment.
- FIG. 32 is a diagram showing a change in recording power and a method for deriving an optimum recording power in the present embodiment.
- FIG. 33 is a diagram showing the relationship between the position in the circumference of the track and the optimum recording power.
- FIG. 2 shows a configuration diagram of the optical disc in the embodiment of the present invention.
- the optical disc 200 includes a first substrate 201, a first protective layer 202, a recording layer 203, a second protective layer 204, and a reflective layer 200. 5 and a second substrate 206.
- the optical disc 200 has a clamp hole 207 formed therein.
- the first substrate 201 and the second substrate 206 are made of a poly-polycarbonate resin or the like, and the first protective layer 202 and the second protective layer 204 constitute the recording layer 203. Protect and use multiple reflections to improve the quality of the reproduced signal.
- the clamp hole 207 is provided for transmitting the rotation of the spindle motor by a shaft rod and rotating the optical disk.
- the recording layer 203 has a plurality of spiral tracks (not shown).
- the track has a land group structure (not shown), and in the present embodiment, information recorded by a predetermined modulation rule, for example, a (1, 7) modulation code is recorded as a recording mark in the group portion. Therefore, the description of the tracks in the drawings in the present embodiment mainly refers to the group portion, and the land portion is omitted.
- the formation of the recording mark is performed by changing the material of the recording layer into optical characteristics by a laser beam recording pulse. Laser light is emitted from the first substrate 201 side.
- the material of the recording layer is a phase change material, but may be an organic dye film.
- the track includes address information by forming the track into a meandering wobble shape.
- Fig. 3 shows an explanatory diagram of the track shape.
- FIG. 3 (a) shows a wobble shape 301 in the present embodiment, and it is assumed that address information (digital signal) is determined based on the tilt angle and direction of the wobble waveform.
- the address information may be formed by a method other than the wobble shape 301.
- a track is composed of a plurality of sectors, and in each sector, address information is formed by uneven pits 302. Since the uneven pits 302 change the amount of reflected laser light, the signals “0” and “1” of the address information can be determined.
- the address information may be formed by a method other than the wobble shape.
- FIG. 4 is an explanatory diagram of a recording pulse waveform and a recording power according to the embodiment of the present invention.
- FIG. 4 (a) shows that the period Tw of the channel clock as a reference signal at the time of recording data creation is 66 MHz, and the recording signal N RZ I (N on Return to Z) shown in FIG. ero Inv erti ng) The time interval between marks and spaces is determined.
- FIG. 4C shows a multi-pulse train of laser light for forming a recording mark.
- the recording power Pw of the multi-pulse train is set to one of the heating Pp power 401, the cooling Pb power 403, and the erasing Pe power 402.
- the heating Pp power 401 and the cooling Pb power 403 are the power required to form a recording mark. It is.
- the erase Pe power 402 is the power required to erase an existing recording mark to form a space.
- the Pp power 410, the Pe power 402, and the Pb power 403 are set based on the extinction level 404 detected when the laser light is quenched.
- the top pulse width T top of the multi-pulse train is set for a length of 2 T, 3 ° or 4 ° or more.
- the laser emission conditions at the time of recording such as each value of the recording power and the pulse width of the multi-pulse train, are described in the PIC area 104.
- the pulse width is constant regardless of the change in the recording power. Therefore, if the recording power and pulse width of the multi-pulse train described in the PIC area 104 can be reproduced and the recording film can be irradiated with laser light, a recording mark as shown in Fig. 4 (d) is formed. be able to. .
- a single signal having the longest mark of the modulation code is used as the recording signal for calculating the modulation factor.
- the longest single signal of the modulation code is an 8T single signal.
- An 8T single signal is a signal in which an 8T mark and an 8T space are alternately repeated, where T is the length of one cycle of the recording clock Tw. The 8T single signal was selected because the modulation degree changes depending on the size of the recording mark, especially the mark width, and it is necessary to form a recording mark with a stable mark width.
- the shorter the recording mark the more the mark width occupies the entire mark. The percentage increases. Therefore, even if the mark width changes at the beginning or end of the recording mark, the longer recording mark provides a stable mark width at the center of the recording mark, and the longest mark is most effective. Also, a single signal The reason for this is to avoid the influence of intersymbol interference with other signals and to avoid reducing the number of samples due to unnecessary other signals when determining the modulation factor.
- the recording mark will be completely erased when overwritten with the low output recording power on the recording mark.
- a recording mark larger than a recording mark originally formed at low output may be formed, and the detected modulation degree may change.
- the RF signal level changes due to the influence of the recorded / unrecorded state of the adjacent track (crosstalk), and the modulation level detected by recording with the same recording power may differ. In order to avoid such a difference in detection of the RF signal or the modulation degree, it is necessary to remove the existing recording mark before forming the recording mark.
- DC erasing (hereinafter, erasing operation) is performed in advance on the three tracks including the recording / reproducing track and the adjacent track with the Pe power 402 regardless of the presence or absence of the recording mark.
- the erasing operation is performed on three tracks including the adjacent track.
- the erasing operation may be performed on three or more tracks, and when the influence of the crosstalk can be ignored (for example, In the case of a track structure having a long track pitch), the purpose of detecting the modulation factor on the same basis can be achieved by erasing only the track on which recording and reproduction are performed. Further, when it is possible to identify and select the first use of the optical disc having no recorded marks left unrecorded or that the three tracks are in an unrecorded state, the erasing operation may not be performed.
- the unit for changing the recording / reproducing condition is an address unit.
- Fig. 5 (a) shows an example of using a track when the recording track is changed m times n times per track
- Fig. 5 (b) shows a track when the recording layer is changed m times for each track.
- a shows an example of using a track when the recording track is changed m times n times per track
- Fig. 5 (b) shows a track when the recording layer is changed m times for each track.
- Fig. 5 (b) if a track is recorded with the same power around the track, (2 m + l) tracks are required if the adjacent track is in the unrecorded state. In the embodiment, since the recording / recording power is changed m times in one round of the track, only three tracks need to be used even if the adjacent track is included, and unnecessary track use and recording time can be omitted.
- FIG. 6 shows a change in recording power and an RF signal level indicating a signal of the amount of reflected light from a track recorded by the recording power.
- FIG. 6 (a) is a linear representation of one round of the track described in FIG. 5 (a).
- each recording area does not necessarily have to be the same length.
- the signal detection accuracy decreases because the recording range is recorded with a recording power other than the desired power value. Therefore, for example, by setting the recording patterns in the recording ranges of the symbols A and B to be the same, the recording range for a specific recording power is determined. ' May be changed.
- FIG. 6B shows a change in the recording power Pw corresponding to each of the recording ranges A to F.
- the recording powers PA, PB, PC, PD, PE, and PF in the figure represent the output values of the Pp power 401, and the output values of the Pe power 402 and the Pb power 403 correspond to the PeZPp ratio.
- PZPP ratio are always calculated to have a constant relationship.
- the PeZPp ratio and the PbZPP ratio are determined based on information described in the PIC region 104.
- the PeZPp ratio and the PbZPp ratio are changed depending on the application, such as when the Pe power 402 or the Pb part 403 is fixed and the recording characteristic of only the Pp part 401 is detected. May be.
- the recording power Pw is changed in a stepwise manner from a high output to a low output, but the same recording power is set again each time the optical disk rotates 1/4. If this is the case, a self-recording power change from low output to high output may be used, or an irregular rather than stepwise change in recording power may be used.
- the change amount of the recording power Pw is a predetermined value APw601 which is a fixed amount shown in FIG. 6B.
- the desirable predetermined value ⁇ 601 in the present embodiment is 5% of the upper limit recording power defined by the ⁇ D standard.
- the predetermined value APw601 differs between a single-layer disc in which recording power is recorded at a low output and a double-layer disc in which recording power is recorded at a high output. Also, the recording power varies for different types of discs (eg, DVD-RAM).
- the initial value for changing the recording power will be briefly described.
- the recording power Pw recommended by the disc manufacturer can be obtained by the following (Equation 1).
- Pw P ind * p
- the recording power Pin and the constant p are described in the PIC area 104. It also describes the modulation factor mk detected when recording is performed with the recording power Pin. Therefore, when the modulation degree mk is set as the detection target, it is desirable to set the recording power Pind or the recording power in the vicinity thereof (Pind ⁇ Q!) To an initial value.
- hi is an arbitrary power value, for example, a predetermined value APw601. It should be noted that, in all optical disk drives, such as when there are individual differences in the optical characteristics of the optical head or when dust or the like is attached to the optical head, the information is recorded by the recording unit Pin. Note that the modulation power mk is not always detected, so that the recording power Pin and the recording power Pk described later do not always match.
- FIG. 6D The enlarged view of the RF signal is shown in Fig. 6 (d).
- reference numeral 602 denotes a signal level Vref in a state where there is no reflected light amount from the optical disk, which is a reference level when calculating the modulation degree of the RF signal.
- 603 is the minimum value VAL of the RF signal from Vref
- 604 is the maximum value VAH of the RF signal from Vref.
- An averaged degree of modulation can be calculated.
- -mA (VAH-VAL) / VAH
- the modulation degree of the RF signal reproduced from each recording area recorded with other recording powers PB, PC, PD, PE, and PF can be similarly obtained.
- Figure 7 shows the modulation power mA to mF according to the recording power PA to PF.
- 701 is the change that is the detection target.
- the furnishings mk and 702 are recording powers Pk at which the modulation degree mk 701 is detected.
- Fig. 7 (a) shows the case where the target modulation depth mk 701 is outside the range of the modulation depth mA to the modulation depth mF
- Fig. 7 (b) shows that the target modulation depth mk 701 is within the range of the modulation depth mA to the modulation depth mF. Shows the case. .
- the modulation factor mk is out of the range as shown in Fig. 7 (a), it is necessary to change the recording power again to detect the modulation factor including the modulation factor mk. At this time, it is possible to move to another track or reuse the same track, but it is necessary to erase the recording mark first as described above. However, if the same track is to be reused, the adjacent track is not recorded, so it is sufficient to erase only the center track on which the recording mark was formed by the first recording operation.
- the range of the recording power to be executed again is determined based on the recording power second closest to the modulation factor mk. In Fig. 7 (a), it corresponds to the recording power PE.
- the reason for selecting the second closest recording power will be described. For example, in FIG.
- the target modulation factor mk is 40%
- the modulation factor mF recorded with the recording power PF is detected as 40.5%
- the second recording power change is determined by the recording power.
- the second recording power change when the modulation factor recorded with the power reference recording power is 39.5%
- the target modulation factor of 40% is not detected, and it is necessary to execute the third recording power change. In the case of the third and subsequent times, the same phenomenon as in the second time can be considered. In order to avoid this detection error, the next time the recording power is changed, the recording power second closest to the modulation factor mk is used as a reference.
- the recording power PE is set to the initial value PA at the next change in the recording power
- the modulation factor mk is the modulation factor mA or more
- the recording power (PB + (m — 1) * APw601) that is, (PB + 5 * APw601) is set to the initial value PA when the recording power changes next time.
- the modulation depth mk Identify the nearest modulation depth m + close to mk and the nearest modulation depth m ⁇ less than mk and closest to mk.
- the latest modulation degree m + corresponds to the modulation degree mC
- the latest modulation degree m— corresponds to the modulation degree mD.
- a recording power Pk at which the modulation factor mk is predicted to be detected is calculated from the two linear approximations of the latest modulation factors m + and m ⁇ and the value of the modulation factor mk.
- the power Pbest used for actually recording data in the user data area 102 ie, the optimum recording power
- Equation 3 Equation 3
- the integer Er is provided to determine the number of erase operations.
- the erase operation is performed including the adjacent track, but the second operation is performed. Only the center track recorded at the first time is erased.
- an upper limit of the number of erase operations, Ermax (for example, 10), is set. If the number of erase operations, Er, exceeds the value of Ermax, it is determined that there is a problem with the track being used. It can also be applied to means such as moving to a truck.
- the recording ranges A to F have the same length, but the recording ranges do not necessarily have to be the same length.
- a sudden change in the recording power such as when transitioning from the recording power PF to the recording power PA, the recording power is changed and the change is made.
- the subsequent recording power is stabilized, recording is performed at a recording power other than the desired recording power PA. Therefore, it becomes difficult to perform recording with the desired recording power PA over the entire recording range of the symbol A. As a result, the reliability of the recording power in the recording range of the symbol A decreases.
- Fig. 28 (a) shows one round of the track described in Fig. 5 (a), as in Fig. 6 (a). It is a linear expression.
- the symbol T indicates the first recording range for each n. symbol
- the recording range of T is located between the recording range of symbol E and the recording range of symbol A.
- the recording range of symbols A to E is used to determine an index value of signal quality (for example, the degree of modulation of a reproduced signal), while the recording range of symbol T is used to determine an index value of signal quality.
- the length of the recording range of the symbol T may be the same as the length of each recording range of the symbols A to E, or may be longer than the length of each recording range of the symbols A to E.
- the length of the recording range for the symbol T may be twice the length of each recording range for the symbols A through E.
- the length of the recording range indicated by the symbol T is designed to correspond to the time required for changing the recording power when the recording power changes abruptly and for stabilizing the recording power after the change.
- FIG. 28 (b) shows the change in the recording power Pw corresponding to the recording range of the symbol T and the symbols A to E shown in FIG. 28 (a).
- the levels of the recording powers PA to PE decrease stepwise and monotonically by a constant value.
- the recording power PT is set to the same level as the recording power PA. This may ensure that the recording power is not the desired recording power PA in the recording range of symbol T, but that the recording power is the desired recording power PA in the recording range of symbol A. Can be.
- the reliability of the recording power in the recording range of the symbol A does not decrease.
- the reproduced signal obtained from the recording range indicated by the symbol T is not used for obtaining an index value of the signal quality, and thus does not affect the reliability of the recording power.
- FIG. 29 (a) is the same as FIG. 28 (a) except that the arrangement of the recording ranges of symbols A to E is reversed.
- the length of the recording range of the symbol T is determined as described above with reference to FIG.
- FIG. 29 (b) is the same as FIG. 28 (b) except that the level of PA from the recording power PE increases stepwise and monotonically by a constant value.
- the recording power PT is set to the same level as the recording power PE. This may ensure that the recording power is not the desired recording power PE in the recording range of symbol T, but that the recording power is the desired recording power PE in the recording range of symbol E. it can. As a result, the reliability of the recording power in the recording range of the symbol E does not decrease.
- the reproduced signal obtained from the recording range indicated by the symbol T is not used to determine the index value of the signal quality, and does not affect the reliability of the recording power.
- the measurement range is limited so that the head of each recording range is not used to determine the signal quality index. Also, the same effect as that obtained by providing the recording range of the symbol T described above can be obtained. .
- FIG. 30 (b) shows a change in the recording power Pw corresponding to each of the recording ranges from A to F, as in FIG. 6 (b).
- Fig. 30 (c) shows the recording power P as in Fig. 6 (c). • Indicates the RF signal level reproduced from each recording area recorded with w.
- the RF signal reproduced from the beginning of each of the recording ranges of symbols A to F is not used to calculate the signal quality index value. Since the recording power is unstable at the beginning of the recording range indicated by the symbol A, the range excluding the beginning is used as the measurement range. In this case, in order to unify the measurement conditions, it is preferable that the same measurement range in the recording range of the symbol A is used as the measurement range in each of the recording ranges of the symbols B to F. However, in each recording range of symbols B to F, the entire range of each recording range may be used as the measurement range. Reproduced from each of the symbols A through F: The RF signal is used to determine a signal quality indicator. This makes it possible to ensure that the recording power is the desired recording power in each of the measurement ranges A to F. As a result, the reliability of the recording power in each recording range does not decrease.
- FIG. 30 a method for solving the problem that the reliability of the recording power is reduced has been described by taking, as an example, a case where the recording power is stepwise changed from high power to low power for each n. This method can also be applied to a case where the recording power is changed stepwise from low power to high power for each n.
- FIGS. 31 (a) and 31 (b) are the same as FIGS. 6 (a) and 6 (b), except that the arrangement of the recording ranges of symbols A to F is changed. That is, as shown in FIG. 31 (b), the recording power Pw changes in the order of the recording power PA, PC, PE, PF, PD, and PB for each n.
- the levels of the recording powers PA to PF shown in FIG. 31 (b) are the same as the levels of the recording powers PA to PF shown in FIG. 6 (b). Therefore, the change in the recording power Pw is not a fixed amount of change, but at least one change of two or more steps exists.
- n optimum recording / reproducing conditions (eg, , Recording power) may be determined.
- FIGS. 32 (a) and (b) are the same as FIGS. 6 (a) and 6 (b).
- Figure 32 (c) shows how the four optimal recording patterns (Pb estl, Pb est 2, P best 3, P best 4) are determined from the relationship between the four recording powers and the modulation factor. Show.
- the modulation factor mA is calculated from the RF signal according to (Equation 2).
- the modulation factors mB, mC, mD, mE, and mF respectively corresponding to the recording powers PB, PC, PD, PE., And PF are calculated.
- Such a calculation method is the same as the method described with reference to FIG.
- FIG. 33 shows the relationship between the position in the circumference of the track and the optimal recording power levels Pbest1, Pbest2, Pbest3, and Pbest4.
- the optimum recording power can be determined for every 1 / n turn of the track. ..,. '
- Fig. 32 shows an example where the recording power is changed stepwise from high power to low power for each n, and n optimum recording / reproduction conditions (for example, the method for determining (recording power) has been described. This method can be applied to the case where the recording power is changed stepwise from low power to high power for each n.
- FIG. 12 is an enlarged view of an RF signal recorded at a recording power PA
- FIGS. 12 (b) are diagrams illustrating a change in asymmetry with respect to the recording power.
- 1201 is the average value VAave of the maximum value VAH604 and the minimum value VAL603 of the RF signal
- 1202 is the ratio of the upper and lower areas (see the hatched portion) of the RF signal waveform. Sliced level VA s 1 ice.
- a s A (VA s 1 i c e— VAav e) / (VAH— VAL)
- VAave (VAH + VAL) / 2.
- the other record page P Similarly, the asymmetry of each recording area recorded by B, PC, PD, PE and PF can be obtained.
- FIG. 12 (b) shows asymmetries asA to asF according to the recording powers PA to PF.
- # 203 is the optimum recording power Pbest.
- the method of deriving the optimum recording pattern based on the asymmetry characteristic can be performed in the same manner as in the case of the modulation characteristic described above. The difference is that the target value is modulated because the index value is changed from the modulation degree to the asymmetry.
- the degree of asymmetry is 0 from mk 701.
- the recording power in asymmetry 0 is directly the optimum power Pbes ,, t.
- the initial condition of the recording power is the recording power calculated by (Equation 1) P ind * P or the recording power near it
- FIG. 13 summarizes the process of deriving the recording power by asymmetry. After the DC component is cut by AC coupling or the like, the asymmetry may be detected. Next, a method for determining the optimum recording power using the jitter will be described. Jitter refers to the time error between the playback signal and the playback clock Tw.After calculating the standard deviation ⁇ of the jitter distribution as an index value of signal quality, it is treated as the ⁇ ZT w value standardized by the playback clock Tw. It is.
- a single signal is used in the method of determining the recording pattern based on the modulation factor and the asymmetry, but when the recording and reproducing conditions are determined using the jitter, a random signal is used.
- Use signals This means that a data signal is recorded in the user data area 102 even if only a single signal of interest is optimal.
- random signals if the jitter of a single signal of another signal is poor or the effect of intersymbol interference occurs, the jitter of the entire recording signal is optimal even if the jitter of a single signal is optimal. Is not always the case. Therefore, when evaluating using jitter,
- the random signal is 2 ⁇ and 3 ⁇ , and at least one 4 4 ⁇ ⁇ ⁇ ⁇ It is desirable that the signal be composed of the above signals.
- FIG. 14 shows the recordings jA to jF according to the recording powers PA to PF.
- Figure 14 (a) shows the case where the minimum value of the zipper is within the range of zipper jB to zipper jE.
- the optimum condition is the recording power at which the jitter value is minimized. This is because the jitter value changes depending on the playback conditions and noise conditions of the optical disk recording / reproducing device, and the jitter value obtained varies depending on the type of optical disk. It is difficult to set the target value because the value is not described.
- the initial condition of the recording power is the recording power Pind * p calculated by (Equation 1) or the recording power (Pind * p ⁇ It is desirable to set (h) to the initial value.
- the minimum value of the jitter the smaller the jitter value at the point before and after the change in the recording power, and the smaller one is selected. This operation is repeated to search for the minimum value. For example, in Fig. 14 (a), using the jitter value at the maximum recording power value PA as the reference value, comparing the jitter value of the adjacent recording power PB, the recording power PB with the lower jitter value is recognized.
- the recording values PC, PD, PE, and PF are compared with each other. As a result, it is possible to select the recording power that minimizes the jitter, that is, the optimum power Pbest. However, as shown in FIG. 14 (a), when the jitter values jB and jC in the recording power PB and the PC are the same, for example, the average value of the two recording powers is set to the optimum power Pbest. .
- the recording power that minimizes the detection of the recording power is detected by expanding the search range of the recording power. It is necessary to change the search range of the recording power and detect the minimum value again. At this time, it is possible to move to another track or reuse the same track, but it is necessary to erase the recording mark first as described above.
- the range of the recording power to be executed again is determined based on the recording power at which the jitter is detected to be the minimum. In FIG. 14 (b), it corresponds to the recording power PA.
- the recording power PF is set to the initial value PA at the next change of the recording power, and when the minimum value of the jitter is detected by the recording power PF,
- the recording power (PA + (m-1) * APw601), that is, (PA + 5 * APw601) is set to the initial value PA when the recording power changes next time.
- the recording / reproducing condition here, recording power
- the secondary at three points (m 3)
- Other methods of searching for the minimum of the jitter may be used, such as finding the minimum of the jitter by curve approximation. ' In this way, the operation of changing the recording power m times in one track can be repeated n times to derive the optimum recording power.
- the method described with reference to FIGS. 28 to 31 is not limited to the case where the optimum recording power P best is determined by using the modulation degree of the RF signal as an index value, but also the method of asymmetry or jitter of the RF signal. It is needless to say that the present invention can also be applied to the case where the optimum recording power P best is determined by using.
- the method described with reference to FIGS. 28 to 31 relates to how to accurately perform recording on an optical disk while changing the recording power. This is because it is not related to the step (for example, the step of obtaining m averaged index values or the step of obtaining the optimum recording power based on the m averaged index values).
- the average value of n signal data reproduced from an area recorded with the same recording power is obtained based on the mX n signal data reproduced from the optical disc, Based on the average value of the n signal data, m averaged index values (for example, modulation depth, asymmetry, etc.) are obtained, and based on the m averaged index values, an optimal index value is determined.
- the method for determining the recording power P best has been described.
- mxn index values (for example, modulation factor, asymmetry, etc.) are obtained based on mXn signal data reproduced from the optical disk, and the same recording power is obtained based on the mXn index values.
- m averaged index values may be obtained.
- the recording / reproducing conditions are not limited to the above-mentioned conditions relating to the recording power (power of laser light).
- the recording pulse condition of the multi-pulse train m times (m is an integer of 2 or more) to form a recording mark is repeated n times (n is an integer of 2 or more), and an optimum recording pulse is obtained.
- a method for deriving the condition will be described.
- other recording and reproducing conditions such as recording power are set to optimal conditions.
- the recording signal is a random signal described in the method for determining the recording power.
- the method of deriving the recording pulse condition refers to recording compensation for detecting the edge shift at the start and end of each recording mark and optimally correcting the laser output condition of the recording pulse.
- the reference of the edge position is a signal of 4 T or more, which corrects the edge deviation of the 2T and 3T signals. Edge deviation of signals of T and 4 T or more may be corrected.
- FIG. 16 is a diagram for explaining the edge shift and the recording pulse adjustment at the start and end portions of the 2T and 3T signals.
- FIG. 16 (a) shows the edge deviation of the 2T and 3T signals with reference to the beginning of the mark of the 4T signal.
- the leading edge of the 2T signal is recorded with a time delay with respect to the reference position, and the leading edge of the 3T signal is recorded with a time earlier than the reference position. Therefore, as shown in Fig. 16 (b), the rising position of the leading pulse of the multi-pulse train of the 2T and 3T signals is finely adjusted so that the 2T and 3T signals are located at the same position as the edge position of the 4T signal. T signal recording can be started.
- 16 (c) shows the case where the 4T signal's mark end is used as a reference. It shows the edge shift of the 2T and 3T signals, and fine-tuning the final rising position of the multipulse train of the 2T and 3T signals as shown in Fig. Recording of 2T and 3T signals can be terminated at the same position as the edge position of the signal.
- the reference position of the mark start end of the 4T signal is T4s
- the mark end of the 4T signal is Assuming that the reference position is T4e, the position of the starting edge of the 2T and 3T signals is (T4s + ki * Tw), and the position of the ending edge of the -2T and 3T signals is ( ⁇ 4e. + Ki * Tw).
- ki is an arbitrary integer
- Tw is a recording clock. Therefore, the edge deviation of ⁇ 2 s and ⁇ 2e at the start and end edges of 2 T, ⁇ 3 s and ⁇ at the start and end edges of 3 T
- the shift amount serving as an index value of the edge shift can be normally calculated as the sum of squares of ⁇ 2 s, A3 s, A2 e, and ⁇ 3 e.
- the edge deviations ⁇ 2 s, ⁇ 2 e, ⁇ 3 s, and ⁇ 3 e obtained by n are averaged and then squared. Calculate the sum.
- the reason why the sum of squares calculated separately for the start and end points is not used is that when the recording mark is very small, such as the shortest mark, the thermal change at the start end when adjusting the start end This also causes a slight edge change on the unadjusted terminal edge. Therefore, when the shift amount is used as the index value, it is desirable to calculate the shift amount by combining the start and end edge deviations.
- the shift amount here is averaged by n pieces of data.
- the recording pulse condition described in the PIC area 104 is set as the initial condition (for example, set to ED in Fig. 17), and the rising position of the first pulse of the 2T signal is fixed. AT shift (for example, Tw / 32).
- the correction amount EC that minimizes the shift amount is selected.
- the correction amount of the recording pulse that minimizes the shift amount is detected for the beginning of the 3T signal and the end of the 2T and 3T signals.
- the order in which the correction is performed is as follows: when recording is performed under the initial conditions of the recording pulse, the maximum value, that is, the maximum positional deviation among the edge deviations ⁇ 2 s, ⁇ 2 e, ⁇ 3 s, and ⁇ 3 e occurs. It is desirable to perform pulse adjustment from the edge that is present. '
- the following describes how to derive the recording / reproducing conditions based on the jitter value.
- the derivation process is basically the same, except that the recording power and recording / reproducing conditions are changed. Only the derivation procedure in each control unit will be described.
- the tilt control is to control the tilt of the optical head with respect to the optical disk and to change the incident angle of the laser beam with respect to the optical disk. Can do. It is assumed that a signal (for example, a random signal) is already recorded on the track performing the reproducing operation and the adjacent track under the same recording conditions, and the tilt position at the time of reproduction is optimized using jitter. At this time, the recording and reproducing conditions other than the tilt control are set to the optimum conditions.
- the jitter is averaged by n data.
- the initial setting of the tilt control is, for example, a state in which the light is irradiated to the optical disk perpendicularly to the optical disk, and the amount of change in the tilt position is set to a fixed amount ⁇ ⁇ i 1 t (for example, 0.1 deg). ).
- a method for controlling the tilt position to the optimal tilt position during recording by repeating the operation of changing the tilt control m times (m is an integer of 2 or more) and recording n times (n is an integer of 2 or more) will be described.
- Recording and playback conditions other than tilt control are optimized, and the tilt position during recording is optimized using jitter.
- the data is averaged by n data.
- the operation of changing the tilt control m times and recording is repeated n times, and the tilt position can be controlled to the optimum tilt position at the time of recording.
- the operation of changing the tracking control for the existing recording track m times (m is an integer of 2 or more) and performing playback n times (n is an integer of 2 or more) is repeated, and the optimal focus for playback is obtained.
- a method for controlling the position will be described.
- the focal point of the laser beam emitted from the optical head is controlled so as to follow the track of the optical disk, and the focal position of the laser beam can be changed in the lateral direction with respect to the track. It is assumed that a signal (for example, a random signal) has already been recorded under the same recording conditions on the track where the reproduction operation is performed and on the adjacent track, and the focus position during reproduction is optimized using jitter. At this time, the recording and reproduction conditions other than the tracking control are set to the optimum conditions.
- the initial setting of the tracking control is, for example, the center position of the track, and the amount of change in the focal position is a fixed amount ⁇ r (for example, 0.01 m).
- the operation of changing the tracking control m times for the existing track can be repeated n times to control the focus to the optimum focus position during reproduction.
- a method for controlling the focus position to the optimal focus position for recording by repeating the tracking control m times (m is an integer of 2 or more) and repeating the recording operation n times (n is an integer of 2 or more) explain. Recording and playback conditions other than tracking control are optimized, and the focus position during recording is optimized using jitter.
- the recording signal is a random signal, and is also recorded on an adjacent track.
- the data is averaged by n data.
- the initial setting of the tracking control is, for example, the center position of the track, and the amount of change in the focal position is a fixed amount ⁇ r (for example, 0.01 m).
- a method for controlling the position will be described.
- the focus control the focus of the laser light emitted from the optical head is controlled so as to converge on the recording layer of the optical disk, and the focal position of the laser light in the optical axis direction can be changed. It is assumed that a signal (for example, a random signal) has already been recorded under the same recording conditions on the track on which the reproduction operation is performed and on an adjacent track, and the focus position during reproduction is optimized using jitter. At this time, the recording and reproducing conditions other than the focus control are set to the optimum conditions.
- n data
- the focus position is converged on the recording layer, and the change amount of the focus position is set to a fixed amount A Fo (for example, 0.05 am).
- the operation of changing the focus control for the existing track m times is repeated n times, and the focus position can be controlled to the optimum at the time of reproduction.
- the recording signal is a random signal, and is also recorded on an adjacent track.
- the average is averaged over n data sets.
- the initial setting of the focus control is, for example, a state in which the focal position is converged on the recording layer, and the amount of change in the focal position is a fixed amount ⁇ (for example, 0.01 m).
- the operation of changing the spherical aberration correction control for the existing recording track m times (m is an integer of 2 or more) and performing playback n times (n is an integer of 2 or more) is repeated to optimize playback.
- a method for controlling the spherical aberration correction amount to a large value will be described.
- the spherical aberration correction control the spherical aberration of the laser beam generated on the recording layer of the optical disk is controlled to be minimized, and the spherical aberration can be changed by adjusting the spherical aberration correction amount.
- a signal for example, a random signal
- the amount of spherical aberration correction at the time of reproduction is optimized by using jitter.
- the recording and reproducing conditions other than the spherical aberration correction control are set to the optimal conditions.
- the initial setting of the spherical aberration correction control is, for example, a state in which the spherical aberration is minimized, and the amount of change in the spherical aberration correction amount is a fixed amount A Sa (for example, 1.
- the operation to change the spherical aberration correction control m times for the existing track Can be repeated n times to control the spherical aberration correction amount to the optimal value at the time of reproduction.
- the method will be described. Recording and reproduction conditions other than spherical aberration correction control are optimized, and the amount of spherical aberration correction during recording is optimized using jitter.
- the recording signal is a random signal and is also recorded on an adjacent track.
- the jitter is averaged by n data.
- the initial setting of the spherical aberration correction control is, for example, a state in which the spherical aberration is minimized, and the amount of change in the spherical aberration correction amount is a fixed amount ASa (for example, 1.0 um).
- the operation of changing the spherical aberration correction control for recording m times and performing recording can be repeated n times to control the optimum spherical aberration correction amount at the time of recording.
- the frequency characteristic control is By controlling the frequency characteristics of the shape equalizer, the boost amount / boost center frequency can be changed. It is assumed that a signal (for example, a random signal) is already recorded on the track where the reproducing operation is performed and the adjacent track under the same recording condition, and the frequency characteristic at the time of reproducing is optimized by using the jitter. At this time, the recording and reproduction conditions other than the frequency characteristic control are set to the optimum conditions.
- the data is averaged by n data.
- the initial setting of the frequency characteristic control is, for example, that the boost center frequency is the carrier frequency of the shortest mark length (about 16.5 MHz for BD) and the change amount of the center frequency is a fixed amount ⁇ F c (for example, 1 0 MHz).
- FIG. 9 shows a configuration of a recording / reproducing device 900 according to the embodiment of the present invention.
- the recording / reproducing device 900 records information on the optical disk 901 or reproduces information recorded on the optical disk 901.
- the recording / reproducing device 900 includes a spindle motor 902, an optical head 903, a laser driving circuit 904, a recording pulse generating circuit 905, an address detector 906, Signal processing circuit 907, data storage means 908, data averaging means 909, signal processing circuit 910, optical disk controller 911, support control circuit 9 1 and 2 are included.
- the servo control circuit 912 includes radial tilt control means 913, tangential tilt control means 914, focus control means 915, tracking control means 916, and spherical aberration correction control means 91. 7 and inclusive.
- the service control circuit ′ 9 12 functions as an optical head control unit that controls the optical head 903.
- the optical disk 90 1 is the one described in FIG.
- the spindle motor 902 rotates the optical disk 901.
- the optical head 903 irradiates the optical disk 901 with a laser beam.
- the optical head 903 outputs a reproduction signal obtained by electrically converting the reflected light from the optical disk 901.
- the laser drive circuit 904 performs power control of the laser light emitted from the optical head 903.
- the recording pulse generation circuit 905 converts the modulated data into light modulated data composed of a pulse train, and further fine-tunes the pulse width and amplitude of the light modulated data to be suitable for forming a pit. Convert to a recording pulse signal.
- the laser drive circuit 906 and the recording pulse generation circuit 905 function as a laser light control unit that controls laser light.
- the address detector 906 detects an address signal from the reproduced signal output from the optical head 903.
- the signal processing circuit 907 processes the reproduced signal output from the optical head 903 and outputs an index value of the signal quality.
- the index values of the signal quality include a modulation degree, an asymmetry, an RF signal level, a jitter, and a shift amount when calculating the modulation degree or the asymmetry.
- the overnight storage means 908 stores the address information output from the address detector 9606, and the reproduction signal output from the signal processing circuit 907. Data such as a quality index value and a recording power value corresponding to the address information output from the optical disk controller 911 are stored.
- the data averaging means 909 averages the data stored under the same condition and stored in the data storage means 908.
- the signal processing circuit 910 is used for further data processing based on the averaged data output from the data averaging means 909. For example, as shown in Fig.
- the RF signal level detector 1001 (corresponding to the signal processing circuit 907) detects the RF signal level, averages the RF signal level, and then modulates the modulation Z asymmetry. This is a case where the calculation means 1002 (corresponding to the signal processing circuit 9110) calculates the modulation degree asymmetry or the like.
- a jitter / edge shift detector 111 (corresponding to the signal processing circuit 907) performs a jitter shift. In this case, the average amount of shifts and shifts can be obtained only by calculating the data amount and using the data equalization means 909 alone. Therefore, the signal processing circuit 907 and the signal processing circuit 910 have the same role in calculating the signal quality index value.
- At least one of the signal processing circuit 907 and the signal processing circuit 910 is provided with a reproduction area obtained from the recording range of the symbol T shown in FIGS. 28 (a) and 29 (a). It is configured not to process signals. Such processing can be easily achieved, for example, by distinguishing the recording range of the symbol T from the other recording ranges (the recording ranges of the symbols A to E).
- at least one of the signal processing circuit 907 and the signal processing circuit 910 is configured not to process a reproduced signal obtained from an area other than the measurement range shown in FIG. 30 (c). Such processing can be easily achieved, for example, by distinguishing a part of the recording range (the head of the recording range) from another range (a part other than the head of the recording range).
- the optical disk controller 911 controls various control units based on the obtained signal quality index values.
- the various control units are tilt control means (radial tilt control means 913, tangential tilt control means 914), focus control means 915, tracking control means 916, and spherical aberration correction.
- Control means 9 1 7 A laser control circuit 912, a laser drive circuit 904, and a recording pulse generation circuit 905 having the following.
- the frequency of the waveform equalizer (not shown) that exists in the Z-edge shift detector 111 and performs waveform shaping.
- Frequency characteristic control means for controlling characteristics for example, boost amount and boost center frequency
- the optical disk controller 911 adjusts the recording power, the support state, and the like according to the result output from the signal processing circuit 910.
- the servo control circuit 912 is composed of tilt control means and focus control means, etc., and controls the rotation of the spindle motor 902, the position control of the optical head 903, the focus and tracking control. I do.
- the tilt control means controls the tilt of the optical head 903 with respect to the optical disk
- the radial tilt control means 913 controls the optical head in the radial direction
- the evening tilt control means 910 controls the optical head in the circumferential direction. Tilt.
- the focus control means 915 controls the focus of the laser light emitted from the optical head 903 so as to converge on the recording layer of the optical disc.
- the tracking control means 916 controls the focal point of the laser light emitted from the optical head 903 so as to follow the track of the optical disk.
- the spherical aberration correction control means 917 controls the spherical aberration of the laser light generated on the recording layer of the optical disc 91.
- the optical disk controller 9 1 1 controls the various recording and playback control units under optimal conditions.
- control a method of controlling the laser drive circuit 904 in the track circumference will be considered, and an example in which the recording power for the optical disc is determined by the degree of modulation will be described with reference to FIG.
- the optical disk controller 911 determines the erasing power based on the information described on the optical disk 901 and instructs the erasing operation to be performed on three tracks around the track on which the recording operation is performed.
- the optical disk controller 911 determines the initial power value of the recording power based on the information described on the optical disk 901.
- the recording pulse generation circuit 905 is instructed to generate a pulse waveform of a single signal of the longest mark of the modulation code (for example, an 8T single signal with the (1,7) modulation code), and the laser
- the driving circuit 904 is instructed to execute the operation of changing the recording power from the initial power value by a fixed amount (for example, 5% of the initial power) m times for each address unit on the track, n times. Instructs to record 8T single signal data with the recording power according to the address and address sections.
- the recorded signal data is reproduced, and the RF signal level detector 1001 detects the RF signal level for each address.
- Information such as the recorded address, the set power, and the detected RF signal level is stored in the data storage means 908, and the RF signal levels recorded in the same recording phase are averaged to obtain the modulation degree Z asymmetry calculation means An average degree of modulation is calculated from 1002.
- the optical disk controller 911 compares the modulation degree information mk described in the optical disk 90.1 among the m calculated modulation degrees on average, and compares the two modulation degree points closest to the mk. By estimating the power at which the mk is expected to be detected by linear approximation of the two modulation factors, and multiplying the estimated power by a constant p described in the optical disc 91 to obtain the new power. The optimum recording power for recording in the data area 102 is determined, and the laser drive circuit 904 is instructed to output the optimum recording power.
- the optical disk controller 911 changes the initial power value, performs the erasing operation and the recording operation again, and The process is re-executed until it falls within the modulation depth range.
- radial tilt control means 9 13, tangential tilt control means 9 14, focus control means 9 15, tracking control 9 16, spherical aberration correction control means 9 17, recording pulse generation circuit 9 05 and Jitter edge shift detector Frequency characteristic control means for example, radial tilt control means 9 13, tangential tilt control means 9 14, focus control means 9 15, tracking control 9 16, spherical aberration correction control means 9 17, recording pulse generation circuit 9 05 and Jitter edge shift detector Frequency characteristic control means.
- the average recording / reproducing conditions for the circumference of the track can be changed in an optical disc where there are variations in the circumference of the track such as track width and reflectivity. Can be determined, and recording and reproduction can be performed more efficiently because extra tracks are not used.
- the above embodiment has been described with reference to a single recording layer, that is, a single-layer disc, the present invention can be implemented for an optical disc having a multilayer structure of two or more layers by using the recording information of each layer described in the optical disc. It is possible.
- a spiral track configuration has been described, the present invention can be applied to an optical disc having a concentric track configuration. Further, the present invention can be applied not only to the group part but also to a land group recording method for recording on a land part used in DVD-RAM.
- the recording code used to determine the recording power based on the modulation factor characteristic in the above embodiment can be applied to the case where the longest mark is 8 T and is a (1, 7) modulation code, and is used for DVD.
- the present invention can be implemented by changing the longest mark to 11 T for a recording code such as an 8-16 modulation code, and can be applied to other recording codes by setting the longest mark. It is possible. Other mark lengths (for example, 7 T) are acceptable as long as the same mark width as the longest mark can be reproduced.
- the signal waveform for deriving the modulation is not limited to a single signal, but a random signal including the longest mark may be recorded, and the modulation may be derived from the maximum and minimum values of the reproduced signal.
- the linear approximation was used to calculate the recording power P k, but other approximation curves such as quadratic curve approximation may be used, and the recording power P best may be calculated by changing the slope of the tangent of the modulation characteristic.
- Other derivation methods such as a method of calculating.
- the index value of the signal quality used for optimizing the recording / reproducing condition in the present embodiment may be another index value such as an error rate / a reliability index value of the decoding result in the maximum likelihood decoding method.
- the tendency of the recording / reproducing condition to change m times in the present embodiment is changed at a constant value so that the control means can easily execute the condition, but may be changed by an indefinite value.
- the optical disc recording / reproducing apparatus may require a sufficient time to change the recording / reproducing conditions due to the performance of the optical disc recording / reproducing apparatus. It is not necessary to repeat n times.For example, the result of recording n places under the first condition in the first rotation and recording n places under the following conditions in the second rotation, etc. Should be the same as the result of repeating the operation of changing n times n times.
- the present invention relates to various recording / reproducing devices that use recording or reproducing of a data signal on an optical disk or other recording medium by laser light or electromagnetic force, for example, a DVD drive used as data storage in a personal computer.
- DVD DVD recorders for video recording can be used for adjusting the recording / playback conditions in the data area of DVD recorders, BD recorders, and other devices, and for other uses such as selecting the location where the recording / playback conditions are adjusted. Is also applicable. ⁇
- the recording / reproducing conditions are determined by including the variations in the circumference of the track such as the track width and the reflectance, the average recording / reproducing condition can be determined for the track ⁇ .
- the method for performing the recording / reproducing operation under one condition per track and detecting the optimum conditions is used to detect variations in the circumference. No extra tracks are used, and the processing time can be reduced.
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JP2007172671A (ja) * | 2005-09-30 | 2007-07-05 | Ricoh Co Ltd | パワー決定方法、片面多層光ディスク、記録方法、プログラム及び記録媒体、並びに光ディスク装置 |
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JP4580450B1 (ja) * | 2009-07-03 | 2010-11-10 | 株式会社日立製作所 | 記録パワー調整方法、情報記録方法及び評価方法 |
JP4586106B1 (ja) * | 2009-12-16 | 2010-11-24 | 日立コンシューマエレクトロニクス株式会社 | 評価方法 |
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- 2004-09-17 CN CNA2004800340385A patent/CN1882989A/zh active Pending
- 2004-09-17 US US10/572,150 patent/US20070121461A1/en not_active Abandoned
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US7668055B2 (en) | 2004-01-28 | 2010-02-23 | Panasonic Corporation | Recording power determination method and device |
US7898916B2 (en) | 2004-01-28 | 2011-03-01 | Panasonic Corporation | Recording power determination method and device |
US8270258B2 (en) | 2004-01-28 | 2012-09-18 | Panasonic Corporation | Recording power determination method and device |
WO2007086284A1 (ja) * | 2006-01-24 | 2007-08-02 | Matsushita Electric Industrial Co., Ltd. | 光ディスク装置運転方法および光ディスク装置 |
US8498186B2 (en) | 2006-02-24 | 2013-07-30 | Marvell World Trade Ltd. | Circuits, architectures, apparatuses, systems, algorithms and methods and software for timing calibration for optical disc recording |
US8811134B1 (en) | 2006-02-24 | 2014-08-19 | Marvell International Ltd. | Circuits, architectures, apparatuses, systems, algorithms and methods and software for optimum power calibration for optical disc recording |
WO2008029353A1 (en) * | 2006-09-07 | 2008-03-13 | Koninklijke Philips Electronics N.V. | Method and apparatus for performing a writing power calibration |
US8064309B2 (en) * | 2006-09-26 | 2011-11-22 | Sony Corporation | Recording/playback apparatus and laser drive pulse adjusting method |
WO2008047516A1 (fr) * | 2006-10-19 | 2008-04-24 | Panasonic Corporation | Dispositif de traitement de signal, dispositif d'affichage optique, dispositif d'enregistrement/reproduction, circuit integere et procede de traitement de signal |
JP2011510425A (ja) * | 2008-01-14 | 2011-03-31 | マーベル ワールド トレード リミテッド | 光ディスク記録に関するタイミング較正のための回路、アーキテクチャ、機器、システム、アルゴリズム及び方法及びソフトウェア |
JP5028531B2 (ja) * | 2008-12-03 | 2012-09-19 | パイオニア株式会社 | 記録装置及び方法、並びにコンピュータプログラム |
WO2010064305A1 (ja) * | 2008-12-03 | 2010-06-10 | パイオニア株式会社 | 記録装置及び方法、並びにコンピュータプログラム |
CN111552237A (zh) * | 2019-02-12 | 2020-08-18 | 发那科株式会社 | 机器学习装置、控制装置、以及机器学习的搜索范围的设定方法 |
JP2020134960A (ja) * | 2019-02-12 | 2020-08-31 | ファナック株式会社 | 機械学習装置、制御装置、及び機械学習の探索範囲の設定方法 |
CN111552237B (zh) * | 2019-02-12 | 2023-12-01 | 发那科株式会社 | 机器学习装置、控制装置、以及机器学习的搜索范围的设定方法 |
Also Published As
Publication number | Publication date |
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CN1882989A (zh) | 2006-12-20 |
US20070121461A1 (en) | 2007-05-31 |
JPWO2005029479A1 (ja) | 2006-11-30 |
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