WO2006132263A1 - Optical recording medium recording/reproducing device and method for correcting recording parameter of such optical recording medium recording/reproducing device - Google Patents
Optical recording medium recording/reproducing device and method for correcting recording parameter of such optical recording medium recording/reproducing device Download PDFInfo
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- WO2006132263A1 WO2006132263A1 PCT/JP2006/311400 JP2006311400W WO2006132263A1 WO 2006132263 A1 WO2006132263 A1 WO 2006132263A1 JP 2006311400 W JP2006311400 W JP 2006311400W WO 2006132263 A1 WO2006132263 A1 WO 2006132263A1
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- recording
- recording medium
- optical recording
- mark
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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
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10481—Improvement or modification of read or write signals optimisation methods
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
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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
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
- G11B20/1258—Formatting, e.g. arrangement of data block or words on the record carriers on discs where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
Definitions
- the present invention relates to an optical recording medium recording / reproducing apparatus that records information on an optical disc and reproduces information recorded on the optical disc, and a recording parameter correction method thereof.
- a recording / reproducing apparatus that records digital information on a recording medium such as an optical disk and reproduces the digital information recorded on the recording medium is widely used.
- a recording / reproducing apparatus that records information on DVD-R and DVD + R using laser light
- a plurality of marks and spaces having different lengths are formed on an optical disc in accordance with recorded data.
- the marks and spaces formed on the optical disk are read using laser light, and data is reproduced by this.
- the shape of the mark formed on the recording medium may differ depending on the individual difference between the apparatus and the recording medium. If the shape of the mark deviates from the desired shape force, the waveform of the read playback signal will deviate from the original waveform, and the quality of the playback signal when the recorded data is played back will depend on the device or recording. There is a problem that variations occur in each medium.
- test recording is performed when the recording medium is loaded into the recording / reproducing apparatus. Specifically, predetermined data is recorded in a predetermined area on the optical disc, and the recorded data is reproduced to check the signal quality. Based on the result, the recording / reproducing apparatus optimizes the characteristics of the reproduction system and the parameters (recording parameters) relating to recording.
- Patent Document 1 The apparatus and control of Patent Document 1 will be described below with reference to the drawings.
- FIG. 4 shows the configuration of a conventional optical disc drive 900 that optimizes the reproduction system characteristics or recording parameters so that the jitter of the reproduction signal is minimized.
- the reflected light of the light irradiated on the optical disc 1 is converted into a reproduction signal corresponding to the recorded data in the optical head 2.
- the reproduced signal is shaped by the waveform equalizer 3 and then binarized by the comparator 4.
- the threshold value (slice level) of the comparator 4 is feedback-controlled by an integration circuit or the like so that the integration result of the binary value output from the comparator 4 becomes 0.
- the phase comparator 5 the comparator The phase error between the binary key output from 4 and the recovered clock signal is measured.
- This recovered clock signal is extracted by a PLL (phase locked loop) circuit from the clock information included in the recovered signal.
- the phase error detected by the phase comparator 5 is averaged by an LPF (low-pass filter) 6 and used as a control voltage of a VCO (voltage controlled oscillator) 7.
- the oscillation frequency of VC07 and the phase of the output clock signal are feedback controlled so that the accumulated phase error output from the phase comparator 5 becomes zero.
- a reproduced clock signal synchronized with the reproduction signal is output from VC07.
- any desired (shift) occurs at the edge of the formed mark, and the mark length is ideal.
- the length is different, a phase error occurs between the binary signal and the recovered clock signal.
- the jitter of the reproduction signal is measured based on this phase error.
- the recording parameter calibration operation in the optical disc drive 900 is as follows. First, the recording compensation circuit 9 generates a recording pulse signal in accordance with the initially set recording parameters and a predetermined recording pattern output from the pattern generation circuit 8. Using this recording pulse signal, the laser drive circuit 10 generates data corresponding to a predetermined recording pattern. Record on optical disc 1.
- the error detection circuit 11 receives from the phase comparator 5 the phase error between the output of the comparator 4 (binarized signal) and the output of the VC07 (regenerated clock signal), and integrates the absolute value of this phase error. The Thus, the error detection circuit 11 integrates the absolute value of the phase error to measure the jitter amount having a correlation with the jitter, and outputs this. Based on the jitter amount thus obtained, the optical disc drive 900 determines whether or not the recording parameter used is appropriate. A large amount of detected jitter means that the recording parameters are not appropriate. The optical disc drive 900 repeats the above operation while changing the value in order to optimize the recording parameter. As a result, a jitter amount corresponding to each recording parameter is detected. Of these, the recording parameter is optimized by selecting the recording parameter that minimizes the amount of jitter.
- the periodic NRZI (non-return to zero inverted) signal (recording pattern) shown in Fig. 5 (a) is given from the pattern generation circuit 8, and predetermined recording parameters are given from the optical recording medium controller 12.
- the recording compensation circuit 9 generates a laser drive signal (recording pulse signal) as shown in FIG. 5B, for example.
- Telp is a recording parameter that determines the position of the front edge of the mark (hereinafter referred to as the start edge!), And Telp determines the position of the mark end edge. It is a recording parameter.
- the start edge! the position of the front edge of the mark
- Telp determines the position of the mark end edge. It is a recording parameter.
- the optical disc 1 is physically placed on the optical disc 1 as shown in FIG. Mark is opened.
- Telpl, Telp2, and Telp3 correspond to the width of the last pulse among the multipulses for writing the 4T mark, and satisfy the relationship of Telpl ⁇ Telp2 and Telp3.
- Telp2 is an optimum recording parameter that makes the mark shape a desired shape.
- the recording parameters Telp, Telpl, Telp2, Telp3, which determine the position of the 4T mark end edge, are changed.
- the shape of the 4T mark (the position of the mark end edge) formed on the optical disk changes as shown in Fig. 5 (c).
- Telp2 which is the optimum value
- a reproduced signal as shown by the solid line in Fig. 5 (d-1) is obtained.
- the broken line represents the reproduction signal when Telp is set to Telp 1 or Telp3.
- the threshold value Thl of the comparator 4 has an integral value of its binarized output of 0.
- Binary key is performed using the threshold value Thl set in this way, and a binary key signal is obtained. Further, the phase comparator 5 detects the phase error between the binary signal output from the comparator 4 and the recovered clock signal, and the recovered clock signal is fed back so that the integrated value of the detected phase error becomes zero. Be controlled. In this way, a reproduction clock signal as shown in FIG. 5 (e-1) is generated.
- the recording parameter Telp is set to a value Telp 1 smaller than the optimum value Telp2, a reproduction signal as shown by the solid line in FIG. 5 (d-2) is obtained.
- the threshold value Th2 of the comparator 4 is as shown in Fig. 5 (d-2), as shown in Fig. 5 (dl). It becomes higher than the level Thl shown in.
- the binary signal output from the comparator 4 also changes.
- the recovered clock signal generated so that the integrated value of the phase error with this binary signal is 0 is shown in Fig. 5 (e-2) as shown in Fig. 5 (e-2). The phase is advanced compared to the clock signal shown.
- the recording parameter Telp is set to a value Telp3 that is larger than the optimum value Telp2, a reproduction signal as shown by the solid line in FIG. 5 (d-3) is obtained.
- the threshold value Th h3 of the comparator 4 is as shown in Fig. 5 (d-l ) Is lower than level Thl.
- the binary signal output from the comparator 4 also changes.
- the recovered clock signal generated so that the integrated value of the phase error with this binarized signal becomes 0 is the clock shown in Fig. 5 (e-l), as shown in Fig. 5 (e-3). The phase is delayed compared to the signal.
- the recording parameters Telp are set to Telpl to Telp3, respectively. Distribution as shown in f3) is obtained. It should be noted that from Fig. 6 (fl) to Fig. 6 (f3) Each of them shows a curve showing the distribution of the phase error related to the 4T mark end edge and a curve showing the phase error distribution related to the 8 T mark end edge. Also, it is assumed that the 4T mark end edge variation and the 8T mark end edge variation have a normal distribution with the same variance value.
- Figure 6 (f-2) shows the case where the recording parameter Telp is set to the appropriate value Telp2.
- the distribution of the phase error between the rising edge of the reproduced signal representing the 4T mark end edge and the reproduced clock is a normal distribution centered at 0, and the average value of this phase error is zero.
- the distribution of the phase error between the rising edge of the reproduction signal representing the 8T mark end edge and the reproduction clock is also a normal distribution centered at 0, and the average value of this phase error is zero. That is, both distribution curves are formed so as to substantially overlap. In this way, when the recording parameters that define the position of the end edge of the 4T mark are appropriate, the jitter of the playback signal is minimized.
- the recording parameter Telp is Telpl (a value smaller than the optimum value Telp2)
- the phase of the recovered clock signal is different from that shown in Fig. 5 (e-1) as shown in Fig. 5 (e-2).
- the average value of the phase error related to the 4T mark end edge and the average value of the phase error related to the 8T mark end edge are not 0. These phase error distributions do not overlap and become a normal distribution centered at the same distance from zero.
- the average value of the phase errors does not become zero, and the distributions of these phase errors do not overlap, and the distribution is centered at the same distance from zero.
- the distribution for the 4T mark end edge and the distribution for the 8T mark end edge are switched between the two distribution curves shown in Fig. 6 (f-3) and the two distribution curves shown in Fig. 6 (f-1). Have It will be. Also in this case, compared with the case of FIG. 6 (f ⁇ 2), the dispersion between the reproduction signal and the clock signal is widened, so that the overall jitter of the reproduction signal is increased.
- the optical disc drive 900 shown in FIG. 4 obtains a value correlated with jitter by accumulating the absolute value of the phase error between the reproduction signal and the clock signal.
- the recording parameters are selected so as to minimize.
- FIG. 6 (g) is a graph showing the relationship between the set recording parameter Telp and the jitter amount output from the error detection circuit 11 (that is, the cumulative value of the absolute value of the phase error). As can be seen from this graph, when the recording parameter Telp is Telp2, the amount of jitter output from the error detection circuit 11 is minimized.
- Patent Document 1 Pamphlet of International Publication No. 2002-84653
- an object of the present invention is to set recording parameters easily at high speed.
- the optical recording medium recording / reproducing apparatus of the present invention records and reads data by a combination of a mark length and a space length formed on the optical recording medium, and physically stores the optical recording medium.
- optical recording medium recording / reproduction in which the data is recorded by virtually dividing the zone into a plurality of zones concentrically and changing the recording speed for each zone.
- An edge shift detection circuit for measuring an edge shift amount of a test recording mark formed on the optical recording medium for each combination of a mark length and a space length, and based on the measured edge shift amount,
- An optical recording medium controller that sets recording parameters for each combination of mark length and space length, and the test recording mark is formed in an outer peripheral area of the optical recording medium.
- the optical recording medium recording / reproducing apparatus of the present invention records and reads data by a combination of a mark length and a space length formed on the optical recording medium, and physically or virtually records the optical recording medium.
- a recording compensation circuit that generates a recording pulse signal using the pattern generation circuit that outputs a recording pattern for test recording, the recording pattern that is input from the pattern generation circuit, and the set recording parameters.
- a circuit, a laser drive circuit for recording test recording data on the optical recording medium in accordance with the recording pulse signal, and reading the test recording data A voltage-controlled oscillator that generates a recovered clock signal based on the recovered signal obtained from the above, a phase comparator that detects a phase error between the recovered signal and the recovered clock signal as an edge shift amount, and a predetermined mark length
- a pattern detection circuit for identifying a signal pattern corresponding to a combination of a space length and a test record formed on the optical recording medium for each combination of a predetermined mark length and a space length identified by the pattern detection circuit.
- An edge shift detection circuit for measuring the edge shift amount of the recording mark and whether the edge shift amount measured by the edge shift detection circuit is within a predetermined range are determined. For combinations that are outside the predetermined range, an optical recording medium that newly sets recording parameters based on the measured edge shift amount. And a controller, the test recording marks, the feature to be formed on the outer circumference area of the optical recording medium.
- the test recording is also performed in an inner peripheral area of the optical recording medium.
- the present invention described in claim 4 is the optical recording medium recording / reproducing apparatus according to claim 2, The test recording is also performed in an inner peripheral area of the optical recording medium.
- the invention according to claim 5 is the optical recording medium recording / reproducing apparatus according to claim 3, wherein the setting of the recording parameter for the zone located on the inner circumference side of the optical recording medium Performed by the test recording performed in the peripheral area, the zone located on the outer peripheral side of the optical recording medium! All the recording parameters are set by the test recording performed in the outer peripheral area of the optical recording medium, and the test recording performed in the outer peripheral area of the optical recording medium has a short space length and a short mark length. It is characterized in that it is performed on specific recording parameters.
- the optical recording medium recording / reproducing apparatus wherein the recording parameter setting for the zone located on the inner peripheral side of the optical recording medium Performed by the test recording performed in the peripheral area, the zone located on the outer peripheral side of the optical recording medium! All the recording parameters are set by the test recording performed in the outer peripheral area of the optical recording medium, and the test recording performed in the outer peripheral area of the optical recording medium has a short space length and a short mark length. It is characterized in that it is performed on specific recording parameters.
- the recording parameter correction method of the optical recording medium recording / reproducing apparatus of the present invention records and reads data according to a combination of a mark length and a space length formed on the optical recording medium, and the optical recording medium
- a recording parameter correction method for an optical recording medium recording / reproducing apparatus for recording the data by physically or virtually concentrically dividing the zone into a plurality of zones and changing the recording speed for each of the zones.
- test recording is performed using a step for setting recording parameters for each set of mark length and space length, and recording parameters set by the recording parameter setting means in the free area on the inner periphery or outer periphery.
- an edge shift amount of the mark formed on the recording medium for each set of mark length and space length. Measuring the edge shift amount, and correcting the recording parameter of the recording parameter setting means so that the measured edge shift amount is minimized.
- optical recording medium recording / reproducing apparatus of the present invention high-speed recording of DVD-R and DVD + R is possible.
- recording it is possible to improve the recording quality by preventing jitter in the recording area on the outer periphery, and realize high-speed recording.
- FIG. 1 is a block diagram of an optical recording medium recording / reproducing apparatus according to an embodiment of the present invention.
- FIG. 2 is a conceptual configuration diagram of an optical recording medium used in the optical recording medium recording / reproducing apparatus of the present embodiment.
- FIG. 3 is a diagram showing the jitter distribution effect of this embodiment.
- FIG. 1 is a block diagram of an optical recording medium recording / reproducing apparatus of the present embodiment
- FIG. 2 is a conceptual configuration diagram of an optical recording medium used in the optical recording medium recording / reproducing apparatus of the present embodiment
- FIG. 3 is a jitter distribution effect of the present embodiment.
- the optical disc apparatus 100 performs a calibration operation (test recording) for optimizing the recording parameters when the optical disc 14 is loaded.
- test recording the pattern generation times
- a recording pulse signal is generated by the recording compensation circuit 27 using a predetermined recording pattern input from the path 26 and the recording parameters that are initially set.
- the recording pattern for test recording used in this embodiment is, for example, 4T mark, 3T space, 4T mark, 4T space, 4T mark, 5T space '(hereinafter also referred to as 4m3s4m4s4m5s'). It is specified to include multiple sets of mark length and space length, which are different from each other. In this embodiment, a 4m3s group, a 4m4s group, a 4m5s group, and the like are included.
- this recording pattern is configured so that DSV (Digital Sum Value) is 0! RU
- the laser drive circuit 28 drives the optical head 13 in accordance with the laser emission control noise signal generated in this way, and records predetermined data on the optical disk 14.
- the optical disc apparatus 100 employs a so-called mark edge recording method, and a plurality of marks and spaces having different lengths corresponding to predetermined data are formed on the optical disc 14.
- predetermined data recorded on the optical disc 14 is reproduced, and the obtained reproduction signal power also determines whether the parameter is appropriate.
- the reproducing laser is irradiated onto the optical disk 14 using the optical head 13. Reflected light from predetermined data recorded on the optical disc 14 is converted into a reproduction signal by the optical head 13.
- the reproduced signal is amplified and then shaped by the waveform equalizer 15.
- the waveform-shaped playback signal is sampled and quantized by an analog-to-digital converter (AZD converter) 16, and as a result, multi-level data is output as a digital signal from the AZD converter 16. Is done.
- the sampling frequency in the AZD converter 16 is set based on an output (reproduced clock signal) from a VCO (voltage controlled oscillator) 21 that is feedback controlled.
- the high-pass filter 17 removes unnecessary low-frequency components contained in the signal output from the AZD transformation 16.
- the output from the high-pass filter 17 is input to the phase comparator 18 and the recording parameter setting block 50 that constitute a part of the PLL circuit 40.
- the phase comparator 18 detects a phase error between the reproduction signal and the reproduction clock signal (that is, the output of VC021) based on the input digital signal.
- LPF (low-pass filter) 19 determines the frequency that VC021 should follow from the detected phase error.
- the signal output from LPF19 is digital-analog conversion m ⁇ (DZA conversion) 20 Converted to a analog signal.
- VC021 is controlled by this analog signal, and a regenerated clock is generated.
- the PLL circuit 40 is configured by the phase comparator 18, LPF 19, and VC021.
- the recovered clock signal output from the VC021 is adjusted so that the phase error from the recovered signal approaches 0 as a whole (that is, the accumulated value of the phase error measured at each polarity inversion portion of the recovered signal or Feedback control is performed so that the average value approaches zero.
- a clock signal synchronized with the reproduction signal is generated based on the reproduction signal.
- a phase error from the clock signal occurs in each polarity inversion portion of the reproduction signal. This phase error is caused by the mark edge being shifted from its proper position, for example due to improper recording parameters.
- the edge shift amount and ⁇ ⁇ can be obtained.
- the edge shift amount of the mark is detected as a phase error between a signal obtained by reproducing data on the recording medium and the clock signal.
- the phase error means a shift on the time axis with respect to the rising edge of the recovered clock signal (corresponding to the sampling timing in the AZD conversion 16) in the polarity inversion portion of the recovered signal.
- the binarization circuit 22 reproduces binarized data corresponding to the recording pattern by binarizing the digital reproduction signal inputted from the high-pass filter 17. Based on the binary key data obtained in this way, the pattern detection circuit 23 can identify a signal pattern corresponding to a combination of a predetermined mark length and space length. Further, the edge shift detection circuit 24 accumulates and adds the above-described phase error for each combination of the predetermined mark length and space length identified by the pattern detection circuit 23. Thus, the edge shift amount of the mark formed on the recording medium can be determined for each set of mark length and space length.
- the optical recording medium controller 25 performs edge shift for each combination of the mark length and the space length, and whether the mark start edge or mark end edge is shifted (that is, the combination corresponding to each recording parameter). Determine whether the amount is within the specified range. If it is within the predetermined range, the recording parameter associated with the combination is judged to be appropriate and is not updated. On the other hand, if it is not within the predetermined range, it is determined that the recording parameter associated with the combination needs to be changed. The optical recording medium controller 25 operates so as to update only the recording parameters determined to be changed. The optical recording medium controller 25 sets recording parameters for each set of mark length and space length based on the measured edge shift amount. The optical recording medium controller 25 outputs the recording parameters updated as necessary to the recording compensation circuit 27.
- the recording compensation circuit 27 generates a recording pulse signal based on the recording parameters obtained from the optical recording medium controller 25. The test recording is continued using the recording pulse signal thus generated. Thereafter, whether or not the recording parameters are appropriate is determined by the same operation as described above, and if there are parameters to be updated there, further test recording is performed. In this way, all recording parameters are optimized.
- the predetermined recording defined to include a plurality of sets of mark length and space length that does not use a different recording pattern for each recording parameter. Test recording is performed using the pattern. At this time, by detecting the edge shift amount for each combination of the mark length and the space length, it is possible to detect how much the edge of the mark in which combination is shifted in which direction. Can do. As a result, the recording parameter to be corrected among a plurality of recording parameters can be selected IJ.
- the outer periphery test area 51 is used to optimize the high-speed recording area. If the calibration of the recording parameters performed in the low-speed recording unit is performed for each zone other than the inner zone ZONE A54, it takes an enormous amount of time and cannot be used in practice. Therefore, in the present embodiment, the high-speed recording unit controls only the trailing edge of the mark immediately before the 3T space and the leading edge of the mark immediately after the 3T space. In high-speed recording of DVD-R and DVD + R, the rear end of the mark part bleeds back and the front end of the mark part easily bleeds forward due to thermal interference.
- a 3T space with a particularly high appearance rate and a short 3T space has a slightly short pseudo space such as a 2.8 space as in (G 1), which immediately deteriorates the jitter.
- G 1 slightly short pseudo space
- G2 a jitter distribution like (G2) can be realized, and high in a short time. It is possible to optimize the parameters of the double-speed recording unit, and to absorb differences in recording medium lots and variations in recording and playback devices.
- optical disk recording / reproducing apparatus that is useful for the present invention optimizes only the minimum recording parameters in the DVD-R and dvd + r with a higher double speed speed. It can be done in a short time.
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Abstract
A recording parameter is set at a high speed and easily. A recording/reproducing device is provided for writing and reading data expressed by combinations of mark lengths and spaces formed on a recording medium. The recording/reproducing device is provided with an edge shift detector (24) for measuring an edge shift quantity of the mark formed on the recording medium by using a data signal for every pair of the mark length and the space length. The recording/reproducing device is also provided with a function of setting the recording parameter for each pair of the mark length and the space length, based on the measured edge shift quantity. In the case of performing recording wherein a speed of recording on the recording medium having a free recording area at an outer circumference position changes by the zone of the recording medium, a test area (51) on the outer circumference is used, and a phase error quantity of a certain prescribed minimum recording parameter of a high double-speed recording section is measured and the recording parameter is set.
Description
明 細 書 Specification
光記録媒体記録再生装置及びその記録パラメータ補正方法 Optical recording medium recording / reproducing apparatus and recording parameter correction method thereof
技術分野 Technical field
[0001] 本発明は、光ディスクに情報を記録するとともに光ディスクに記録された情報を再生 する光記録媒体記録再生装置及びその記録パラメータ補正方法に関する。 The present invention relates to an optical recording medium recording / reproducing apparatus that records information on an optical disc and reproduces information recorded on the optical disc, and a recording parameter correction method thereof.
背景技術 Background art
[0002] 現在、光ディスクなどの記録媒体にデジタル情報を記録し、かつ、記録媒体に記録 されたデジタル情報を再生する記録再生装置が広く用いられている。例えば、レーザ 光を用いて DVD— R、 DVD +Rに情報を記録する記録再生装置では、記録される データに応じて、複数の長さの異なるマーク及びスペースが光ディスク上に形成され る。光ディスク上に形成されたマーク及びスペースはレーザ光を用いて読み出され、 これによつてデータが再生される。 [0002] Currently, a recording / reproducing apparatus that records digital information on a recording medium such as an optical disk and reproduces the digital information recorded on the recording medium is widely used. For example, in a recording / reproducing apparatus that records information on DVD-R and DVD + R using laser light, a plurality of marks and spaces having different lengths are formed on an optical disc in accordance with recorded data. The marks and spaces formed on the optical disk are read using laser light, and data is reproduced by this.
し力し、同じレーザパワーまたはパルス波形を持つレーザ光を用いた書込みであつ ても、装置や記録媒体の個体差によって、記録媒体上に形成されるマークの形状が 異なる場合がある。マークの形状が所望の形状力 ずれていると、読み出された再生 信号の波形が本来の波形からずれ、これによつて記録したデータを再生したときの再 生信号の品質が、装置または記録媒体ごとにばらつきを生じてしまうという問題があ る。 However, even when writing is performed using laser light having the same laser power or pulse waveform, the shape of the mark formed on the recording medium may differ depending on the individual difference between the apparatus and the recording medium. If the shape of the mark deviates from the desired shape force, the waveform of the read playback signal will deviate from the original waveform, and the quality of the playback signal when the recorded data is played back will depend on the device or recording. There is a problem that variations occur in each medium.
このような再生信号の信頼性の低下を防止するために、記録媒体の記録再生装置 への装填時にテスト記録を行っている。具体的には、所定のデータを光ディスク上の 所定の領域に記録し、この記録されたデータを再生して信号品質を確認している。記 録再生装置は、その結果に基づいて再生系の特性の最適化や記録に関するパラメ ータ (記録パラメータ)の最適化を行う。 In order to prevent such a decrease in the reliability of the reproduction signal, test recording is performed when the recording medium is loaded into the recording / reproducing apparatus. Specifically, predetermined data is recorded in a predetermined area on the optical disc, and the recorded data is reproduced to check the signal quality. Based on the result, the recording / reproducing apparatus optimizes the characteristics of the reproduction system and the parameters (recording parameters) relating to recording.
特に、高倍速記録になるとレーザ照射により熱が与えられることで記録媒体上に所 望でな ヽ形状のマーク(すなわち、エッジ位置がシフトしたマーク)が形成されやす ヽ 。この熱干渉の程度は、記録媒体上に形成されるマーク及びスペースのパターンに よっても異なる。従って、このような記録媒体を用いる場合、上記のパターンに応じて
最適な記録パラメータを設定することが好ましい。例えば特許文献 1では、テスト記録 において、再生信号の品質は、例えば、ジッタ (再生信号の時間軸方向の揺れ)によ つて判断している。 In particular, in high-speed recording, heat is applied by laser irradiation, so that a desired wrinkle-shaped mark (that is, a mark whose edge position is shifted) is easily formed on the recording medium. The degree of this thermal interference varies depending on the mark and space pattern formed on the recording medium. Therefore, when using such a recording medium, according to the above pattern It is preferable to set optimum recording parameters. For example, in Patent Document 1, in test recording, the quality of a reproduction signal is determined by, for example, jitter (a fluctuation in the time axis direction of the reproduction signal).
以下に特許文献 1の装置及び制御について図面を用いて説明する。 The apparatus and control of Patent Document 1 will be described below with reference to the drawings.
図 4は、再生信号のジッタが最小となるように再生系の特性あるいは記録パラメータ の最適化を行う従来の光ディスクドライブ 900の構成を示して 、る。光ディスク 1に対 して照射された光の反射光は、光学ヘッド 2において、記録されたデータに対応する 再生信号に変換される。 FIG. 4 shows the configuration of a conventional optical disc drive 900 that optimizes the reproduction system characteristics or recording parameters so that the jitter of the reproduction signal is minimized. The reflected light of the light irradiated on the optical disc 1 is converted into a reproduction signal corresponding to the recorded data in the optical head 2.
再生信号は、波形等化器 3によって波形整形された後、コンパレータ 4によって 2値 化される。このコンパレータ 4のしきい値 (スライスレベル)は、積分回路などによって、 コンパレータ 4からの 2値ィ匕出力の積分結果が 0となるようにフィードバック制御される 次に、位相比較器 5において、コンパレータ 4からの 2値ィ匕出力と再生クロック信号と の位相誤差が測定される。この再生クロック信号は、 PLL (phase locked loop)回 路によって、再生信号に含まれるクロック情報力 抽出される。具体的には、位相比 較器 5にお 、て検出された位相誤差を LPF (ローパスフィルタ) 6によって平均処理し 、これを VCO (電圧制御発振器) 7の制御電圧として用いる。このとき、 VC07の発振 周波数及び出力されるクロック信号の位相は、位相比較器 5から出力される位相誤 差の累積が 0になるようにフィードバック制御される。これによつて、 VC07からは、再 生信号と同期が取られた再生クロック信号が出力される。ただし、 PLL回路を用いて 生成された再生クロック信号を用いる場合であっても、形成されたマークのエッジに おいて所望でないずれ (シフト)が生じており、マークの長さが理想的な長さと異なる ときには、 2値ィ匕信号と再生クロック信号との間に位相誤差が生じる。光ディスクドライ ブ 900では、この位相誤差に基づ 、て再生信号のジッタが測定される。 The reproduced signal is shaped by the waveform equalizer 3 and then binarized by the comparator 4. The threshold value (slice level) of the comparator 4 is feedback-controlled by an integration circuit or the like so that the integration result of the binary value output from the comparator 4 becomes 0. Next, in the phase comparator 5, the comparator The phase error between the binary key output from 4 and the recovered clock signal is measured. This recovered clock signal is extracted by a PLL (phase locked loop) circuit from the clock information included in the recovered signal. Specifically, the phase error detected by the phase comparator 5 is averaged by an LPF (low-pass filter) 6 and used as a control voltage of a VCO (voltage controlled oscillator) 7. At this time, the oscillation frequency of VC07 and the phase of the output clock signal are feedback controlled so that the accumulated phase error output from the phase comparator 5 becomes zero. As a result, a reproduced clock signal synchronized with the reproduction signal is output from VC07. However, even if a recovered clock signal generated using a PLL circuit is used, any desired (shift) occurs at the edge of the formed mark, and the mark length is ideal. When the length is different, a phase error occurs between the binary signal and the recovered clock signal. In the optical disk drive 900, the jitter of the reproduction signal is measured based on this phase error.
光ディスクドライブ 900における記録パラメータの校正動作は以下の通りである。 まず、初期設定された記録パラメータ及びパターン発生回路 8から出力される所定 の記録パターンに従って、記録補償回路 9は記録パルス信号を生成する。この記録 パルス信号を用いて、レーザ駆動回路 10は、所定の記録パターンに応じたデータを
光ディスク 1に記録する。 The recording parameter calibration operation in the optical disc drive 900 is as follows. First, the recording compensation circuit 9 generates a recording pulse signal in accordance with the initially set recording parameters and a predetermined recording pattern output from the pattern generation circuit 8. Using this recording pulse signal, the laser drive circuit 10 generates data corresponding to a predetermined recording pattern. Record on optical disc 1.
次に、このデータが記録された光ディスク 1上のトラックが読み出される。このとき誤 差検出回路 11は、位相比較器 5から、コンパレータ 4の出力(2値化信号)と VC07の 出力(再生クロック信号)との位相誤差を受け取り、この位相誤差の絶対値を積分す る。このように、誤差検出回路 11は、位相誤差の絶対値を積分することによって、ジッ タと相関を持つジッタ量を測定し、これを出力する。このようにして得られたジッタ量に 基づいて、光ディスクドライブ 900は、用いられた記録パラメータが適切であった力否 かを判断する。検出されるジッタ量が大きいと記録パラメータが適切でないことを意味 する。光ディスクドライブ 900は、記録パラメータを最適化するために、その値を変化 させながら上述の動作を繰り返す。これにより、記録パラメータ毎に、それぞれに対応 するジッタ量が検出される。このうち、ジッタ量が最小となる記録パラメータを選択する ことで、記録パラメータの最適化が行われる。 Next, the track on the optical disc 1 on which this data is recorded is read. At this time, the error detection circuit 11 receives from the phase comparator 5 the phase error between the output of the comparator 4 (binarized signal) and the output of the VC07 (regenerated clock signal), and integrates the absolute value of this phase error. The Thus, the error detection circuit 11 integrates the absolute value of the phase error to measure the jitter amount having a correlation with the jitter, and outputs this. Based on the jitter amount thus obtained, the optical disc drive 900 determines whether or not the recording parameter used is appropriate. A large amount of detected jitter means that the recording parameters are not appropriate. The optical disc drive 900 repeats the above operation while changing the value in order to optimize the recording parameter. As a result, a jitter amount corresponding to each recording parameter is detected. Of these, the recording parameter is optimized by selecting the recording parameter that minimizes the amount of jitter.
以下、図 5及び図 6を参照しながら、再生信号のジッタ測定に基づく記録パラメータ の最適化の手順について説明する。 6Tスペース、 4Tマーク、 6Tスペース、 8Tマー クの繰り返しで規定される記録パターンを用いてテスト記録を行うことによって、 4Tマ 一クの後側のエッジ(終端エッジ)の位置を規定する記録パラメータの最適化を例示 している。図 5 (a)のょぅな周期的なNRZI (non—return to zero inverted)信号 (記録パターン)がパターン発生回路 8から与えられ、また、所定の記録パラメータが 光記録媒体コントローラ 12から与えられると、記録補償回路 9は、例えば、図 5 (b)に 示すようなレーザ駆動信号 (記録パルス信号)を生成する。ここで、図 5 (b)に示す Ts fpはマークの前側のエッジ(以下、始端エッジと!、う)の位置を決定する記録パラメ一 タであり、 Telpはマーク終端エッジの位置を決定する記録パラメータである。これらの 記録パラメータに基づ!/、て生成された記録パルス信号に従つて光ディスク 1上にレー ザを照射することによって、光ディスク 1上には、図 5 (c)に示すように物理的にマーク が开成される。 Telpl、 Telp2、 Telp3は、 4Tマークを書込むためのマルチパルスの うちのラストパルスの幅に相当し、 Telpl <Telp2く Telp3の関係を満たす。また、 T elp2は、マークの形状が所望の形状となるような最適な記録パラメータとする。 4Tマ ークの終端エッジの位置を定める記録パラメータ Telpを、 Telpl、 Telp2、 Telp3と変
化させた場合、光ディスク上に形成される 4Tマークの形状 (マーク終端エッジの位置 )は図 5 (c)に示すように変化する。記録パラメータ Telpを最適値の Telp2としたとき、 図 5 (d— 1)の実線で示すような再生信号が得られる。なお、図 5 (d— 1)において、 破線は、 Telpを Telp 1または Telp3に設定した場合における再生信号を表す。 このように図 5 (d— 1)の実線で示すような再生信号が得られると、この再生信号に 基づいて、コンパレータ 4のしきい値 Thlは、その 2値化出力の積分値が 0となるよう に設定される。このようにして設定されたしきい値 Thlを用いて 2値ィ匕が行われ、これ により 2値ィ匕信号が得られる。さらに、位相比較器 5において、コンパレータ 4から出力 される 2値ィヒ信号と再生クロック信号との位相誤差が検出され、検出された位相誤差 の積分値が 0となるように再生クロック信号がフィードバック制御される。このようにして 、図 5 (e— 1)に示すような再生クロック信号が生成される。 Hereinafter, the procedure for optimizing the recording parameters based on the jitter measurement of the reproduction signal will be described with reference to FIG. 5 and FIG. A recording parameter that defines the position of the trailing edge of the 4T mark by performing test recording using a recording pattern defined by repetition of 6T space, 4T mark, 6T space, and 8T mark. This is an example of optimization. The periodic NRZI (non-return to zero inverted) signal (recording pattern) shown in Fig. 5 (a) is given from the pattern generation circuit 8, and predetermined recording parameters are given from the optical recording medium controller 12. Then, the recording compensation circuit 9 generates a laser drive signal (recording pulse signal) as shown in FIG. 5B, for example. Here, Ts fp shown in Fig. 5 (b) is a recording parameter that determines the position of the front edge of the mark (hereinafter referred to as the start edge!), And Telp determines the position of the mark end edge. It is a recording parameter. By irradiating the laser onto the optical disc 1 according to the recording pulse signal generated based on these recording parameters! /, The optical disc 1 is physically placed on the optical disc 1 as shown in FIG. Mark is opened. Telpl, Telp2, and Telp3 correspond to the width of the last pulse among the multipulses for writing the 4T mark, and satisfy the relationship of Telpl <Telp2 and Telp3. Telp2 is an optimum recording parameter that makes the mark shape a desired shape. The recording parameters Telp, Telpl, Telp2, Telp3, which determine the position of the 4T mark end edge, are changed. In this case, the shape of the 4T mark (the position of the mark end edge) formed on the optical disk changes as shown in Fig. 5 (c). When the recording parameter Telp is set to Telp2, which is the optimum value, a reproduced signal as shown by the solid line in Fig. 5 (d-1) is obtained. In FIG. 5 (d-1), the broken line represents the reproduction signal when Telp is set to Telp 1 or Telp3. When a reproduction signal as shown by the solid line in FIG. 5 (d-1) is obtained in this way, based on this reproduction signal, the threshold value Thl of the comparator 4 has an integral value of its binarized output of 0. It is set to be. Binary key is performed using the threshold value Thl set in this way, and a binary key signal is obtained. Further, the phase comparator 5 detects the phase error between the binary signal output from the comparator 4 and the recovered clock signal, and the recovered clock signal is fed back so that the integrated value of the detected phase error becomes zero. Be controlled. In this way, a reproduction clock signal as shown in FIG. 5 (e-1) is generated.
一方、記録パラメータ Telpを、最適値 Telp2より小さい値 Telp 1に設定した場合、 図 5 (d— 2)の実線で示すような再生信号が得られる。この場合、 4Tマーク終端エツ ジのエッジポジションが時間軸方向にシフトしているため、コンパレータ 4のしきい値 T h2は図 5 (d—2)に示すように、図 5 (d—l)に示すレベル Thlよりも高くなる。これに より、コンパレータ 4から出力される 2値ィ匕信号も変化する。また、この 2値ィ匕信号との 位相誤差の積分値が 0となるように生成された再生クロック信号は、図 5 (e— 2)に示 すように、図 5 (e—l)に示すクロック信号に比べて位相が進んだものとなる。 On the other hand, when the recording parameter Telp is set to a value Telp 1 smaller than the optimum value Telp2, a reproduction signal as shown by the solid line in FIG. 5 (d-2) is obtained. In this case, since the edge position of the 4T mark end edge is shifted in the time axis direction, the threshold value Th2 of the comparator 4 is as shown in Fig. 5 (d-2), as shown in Fig. 5 (dl). It becomes higher than the level Thl shown in. As a result, the binary signal output from the comparator 4 also changes. In addition, the recovered clock signal generated so that the integrated value of the phase error with this binary signal is 0 is shown in Fig. 5 (e-2) as shown in Fig. 5 (e-2). The phase is advanced compared to the clock signal shown.
逆に、記録パラメータ Telpを、最適値 Telp2より大きい値 Telp3に設定した場合、 図 5 (d— 3)の実線で示すような再生信号が得られる。この場合、 4Tマーク終端エツ ジのエッジポジションが時間軸方向にシフトしているため、コンパレータ 4のしきい値 T h3は、図 5 (d—3)に示すように、図 5 (d—l)に示すレベル Thlよりも低くなる。これ により、コンパレータ 4から出力される 2値ィ匕信号も変化する。また、この 2値化信号と の位相誤差の積分値が 0となるように生成された再生クロック信号は、図 5 (e— 3)に 示すように、図 5 (e—l)に示すクロック信号に比べて位相が遅れたものとなる。 Conversely, when the recording parameter Telp is set to a value Telp3 that is larger than the optimum value Telp2, a reproduction signal as shown by the solid line in FIG. 5 (d-3) is obtained. In this case, since the edge position of the 4T mark end edge is shifted in the time axis direction, the threshold value Th h3 of the comparator 4 is as shown in Fig. 5 (d-l ) Is lower than level Thl. As a result, the binary signal output from the comparator 4 also changes. In addition, the recovered clock signal generated so that the integrated value of the phase error with this binarized signal becomes 0 is the clock shown in Fig. 5 (e-l), as shown in Fig. 5 (e-3). The phase is delayed compared to the signal.
ここで、マーク終端エッジでの、再生信号と再生クロック信号との時間ずれまたは位 相誤差を測定すると、記録パラメータ Telpを Telpl〜Telp3とした場合のそれぞれで 、図 6 (fl)〜図 6 (f3)に示すような分布が得られる。なお、図 6 (fl)〜図 6 (f3)のそ
れぞれには、 4Tマーク終端エッジに関連する上記位相誤差の分布を示す曲線と、 8 Tマーク終端エッジに関連する上記位相誤差の分布を示す曲線とが示されている。 また、 4Tマーク終端エッジのばらつきと、 8Tマーク終端エッジのばらつきとは、同じ 分散値の正規分布を持つものと仮定して 、る。 Here, when the time lag or phase error between the playback signal and the playback clock signal at the mark end edge is measured, the recording parameters Telp are set to Telpl to Telp3, respectively. Distribution as shown in f3) is obtained. It should be noted that from Fig. 6 (fl) to Fig. 6 (f3) Each of them shows a curve showing the distribution of the phase error related to the 4T mark end edge and a curve showing the phase error distribution related to the 8 T mark end edge. Also, it is assumed that the 4T mark end edge variation and the 8T mark end edge variation have a normal distribution with the same variance value.
図 6 (f—2)は、記録パラメータ Telpを適切な値 Telp2に設定した場合を示す。この 場合、 4Tマーク終端エッジを表す再生信号の立ち上がりエッジと再生クロックとの間 の位相誤差の分布は 0を中心とする正規分布となり、この位相誤差の平均値は 0とな る。また、 8Tマーク終端エッジを表す再生信号の立ち上がりエッジと再生クロックとの 位相誤差の分布も 0を中心とする正規分布となり、この位相誤差の平均値が 0となる。 すなわち、両者の分布曲線は略重なるように形成される。このように、 4Tマークの終 端エッジの位置を規定する記録パラメータが適切である場合には、再生信号のトータ ノレのジッタは最 ヽになる。 Figure 6 (f-2) shows the case where the recording parameter Telp is set to the appropriate value Telp2. In this case, the distribution of the phase error between the rising edge of the reproduced signal representing the 4T mark end edge and the reproduced clock is a normal distribution centered at 0, and the average value of this phase error is zero. In addition, the distribution of the phase error between the rising edge of the reproduction signal representing the 8T mark end edge and the reproduction clock is also a normal distribution centered at 0, and the average value of this phase error is zero. That is, both distribution curves are formed so as to substantially overlap. In this way, when the recording parameters that define the position of the end edge of the 4T mark are appropriate, the jitter of the playback signal is minimized.
しかし、記録パラメータ Telpが Telpl (最適値 Telp2より小さい値)の場合は、図 5 ( e- 2)に示すように再生クロック信号の位相が図 5 (e— 1)に示したものに比べてずれ ているため、図 6 (f—l)に示すように、 4Tマーク終端エッジに関連する位相誤差の 平均値及び 8Tマーク終端エッジに関連する位相誤差の平均値のそれぞれは 0とは ならない。これらの位相誤差の分布は重ならず、 0から同じ距離だけ離れたところに 中心をもつ正規分布となる。すなわち、 4Tマーク終端エッジのシフトによって再生ク ロックの位相が変化するので、 4Tマークだけでなぐ本来適切な記録パラメータで記 録されていた 8Tマークに対応する再生信号においても、その位相誤差の平均 (分布 曲線のピーク)が 0にはならなくなる。この結果、図 6 (f— 2)の場合と比べて、再生信 号とクロック信号とのずれ幅が全体として大きくなり、再生信号のジッタが増大する。 同様に、記録パラメータ Telpが Telp3 (最適値 Telp2より大きい値)の場合は、図 6 ( f 3)に示すように、 4Tマーク終端エッジに関連する位相誤差の平均値と 8Tマーク 終端エッジに関連する位相誤差の平均値とが 0にならず、これらの位相誤差の分布 は重ならず、 0から同じ距離だけ離れたところに中心をもつ分布となる。なお、図 6 (f - 3)に示す 2つの分布曲線と図 6 (f— 1)に示した 2つの分布曲線とでは、 4Tマーク 終端エッジに関する分布と 8Tマーク終端エッジに関する分布とが入れ替わつている
ことになる。この場合も、図 6 (f— 2)の場合と比べて、再生信号とクロック信号とのず れの分散が広がるため、再生信号の全体的なジッタが増大する。 However, when the recording parameter Telp is Telpl (a value smaller than the optimum value Telp2), the phase of the recovered clock signal is different from that shown in Fig. 5 (e-1) as shown in Fig. 5 (e-2). As shown in Fig. 6 (fl), the average value of the phase error related to the 4T mark end edge and the average value of the phase error related to the 8T mark end edge are not 0. These phase error distributions do not overlap and become a normal distribution centered at the same distance from zero. In other words, since the phase of the playback clock changes due to the shift of the 4T mark end edge, even in the playback signal corresponding to the 8T mark originally recorded with the appropriate recording parameters other than just the 4T mark, the average of the phase error (Peak of distribution curve) does not become zero. As a result, compared with the case of FIG. 6 (f-2), the deviation width between the reproduction signal and the clock signal is increased as a whole, and the jitter of the reproduction signal increases. Similarly, when the recording parameter Telp is Telp3 (a value greater than the optimum value Telp2), the average phase error associated with the 4T mark end edge and the 8T mark end edge are related, as shown in Figure 6 (f 3). The average value of the phase errors does not become zero, and the distributions of these phase errors do not overlap, and the distribution is centered at the same distance from zero. Note that the distribution for the 4T mark end edge and the distribution for the 8T mark end edge are switched between the two distribution curves shown in Fig. 6 (f-3) and the two distribution curves shown in Fig. 6 (f-1). Have It will be. Also in this case, compared with the case of FIG. 6 (f−2), the dispersion between the reproduction signal and the clock signal is widened, so that the overall jitter of the reproduction signal is increased.
このようなジッタの増大を抑制するために、図 4に示す光ディスクドライブ 900は、再 生信号とクロック信号との位相誤差の絶対値を累積することでジッタと相関のある値 を求め、この値が最小となるように記録パラメータを選択している。図 6 (g)は、設定さ れた記録パラメータ Telpと、誤差検出回路 11から出力されるジッタ量 (すなわち、位 相誤差の絶対値の累積値)との関係を示すグラフである。このグラフからわかるように 、記録パラメータ Telpが Telp2の時に、誤差検出回路 11から出力されるジッタ量が 最小となる。 In order to suppress such an increase in jitter, the optical disc drive 900 shown in FIG. 4 obtains a value correlated with jitter by accumulating the absolute value of the phase error between the reproduction signal and the clock signal. The recording parameters are selected so as to minimize. FIG. 6 (g) is a graph showing the relationship between the set recording parameter Telp and the jitter amount output from the error detection circuit 11 (that is, the cumulative value of the absolute value of the phase error). As can be seen from this graph, when the recording parameter Telp is Telp2, the amount of jitter output from the error detection circuit 11 is minimized.
特許文献 1:国際公開第 2002— 84653号パンフレット Patent Document 1: Pamphlet of International Publication No. 2002-84653
発明の開示 Disclosure of the invention
発明が解決しょうとする課題 Problems to be solved by the invention
[0003] このような従来の構成では、 DVD— R、 DVD+Rの高倍速の記録 (記録媒体の半 径位置により記録速度が変わる記録)の場合、低倍速記録の場合は内周のテストエリ ァにて記録媒体上に形成されるマーク及びスペースのパターン毎に最適な記録パラ メータを設定することが可能であるが、外周の高倍速領域においては、モータの能力 の関係(内周で高速で回転させる能力が無 、)で内周のテストエリアを利用して記録 パラメータの校正動作が行えないので、記録媒体、記録速度毎に固定の記録パラメ ータを設定せざるを得ない。この場合、同じ記録媒体でもロットの違いや、記録再生 装置のノ ツキを吸収できずにジッタ量が悪ィ匕し記録速度を制限せざるを得ないと いう課題を有していた。 [0003] With such a conventional configuration, in the case of high-speed recording of DVD-R and DVD + R (recording speed varies depending on the radius position of the recording medium), in the case of low-speed recording, the inner peripheral test area is used. It is possible to set the optimum recording parameters for each mark and space pattern formed on the recording medium with the key, but in the high-speed region on the outer periphery, the relationship between the motor capabilities (high speed on the inner periphery). Since the recording parameter calibration operation cannot be performed using the inner test area, it is necessary to set fixed recording parameters for each recording medium and recording speed. In this case, even with the same recording medium, there has been a problem that the recording speed cannot be limited because the difference in lots and the noise of the recording / reproducing apparatus cannot be absorbed, and the amount of jitter deteriorates.
[0004] 本発明は、上記従来の問題を解決するために、高速で、簡易的に記録パラメータ を設定することを目的とする。 [0004] In order to solve the above-described conventional problems, an object of the present invention is to set recording parameters easily at high speed.
課題を解決するための手段 Means for solving the problem
[0005] 請求項 1記載の本発明の光記録媒体記録再生装置は、光記録媒体に形成される マーク長及びスペース長との組み合わせによってデータの記録及び読み出しを行い 、前記光記録媒体を物理的または仮想的に同心円状に複数のゾーンに分割し、前 記ゾーン毎に記録速度を変化させて前記データの記録を行う光記録媒体記録再生
装置であって、前記光記録媒体に形成されたテスト記録用マークのエッジシフト量を マーク長とスペース長との組み合わせごとに測定するエッジシフト検出回路と、測定 された前記エッジシフト量に基づき、マーク長とスペース長との組み合わせごとに記 録パラメータを設定する光記録媒体コントローラとを備え、前記テスト記録用マークを 、前記光記録媒体の外周エリアに形成することを特徴とする。 The optical recording medium recording / reproducing apparatus of the present invention according to claim 1 records and reads data by a combination of a mark length and a space length formed on the optical recording medium, and physically stores the optical recording medium. Alternatively, optical recording medium recording / reproduction in which the data is recorded by virtually dividing the zone into a plurality of zones concentrically and changing the recording speed for each zone. An edge shift detection circuit for measuring an edge shift amount of a test recording mark formed on the optical recording medium for each combination of a mark length and a space length, and based on the measured edge shift amount, An optical recording medium controller that sets recording parameters for each combination of mark length and space length, and the test recording mark is formed in an outer peripheral area of the optical recording medium.
請求項 2記載の本発明の光記録媒体記録再生装置は、光記録媒体に形成される マーク長及びスペース長との組み合わせによってデータの記録及び読み出しを行い 、前記光記録媒体を物理的または仮想的に同心円状に複数のゾーンに分割し、前 記ゾーン毎に記録速度を変化させて前記データの記録を行う光記録媒体記録再生 装置であって、マーク長とスペース長との複数の組み合わせを規定して 、るテスト記 録用の記録パターンを出力するパターン発生回路と、前記パターン発生回路から入 力された前記記録パターンと、設定された記録パラメータとを用いて記録パルス信号 を生成する記録補償回路と、前記記録パルス信号に応じて前記光記録媒体にテスト 記録用データを記録するレーザ駆動回路と、前記テスト記録用データを読み出すこ とで得られる再生信号に基づいて再生クロック信号を生成する電圧制御発振器と、 前記再生信号と前記再生クロック信号との間の位相誤差をエッジシフト量として検出 する位相比較器と、所定のマーク長とスペース長との組み合わせに対応する信号パ ターンを識別するパターン検出回路と、前記パターン検出回路で識別された所定の マーク長とスペース長との組み合わせごとに前記光記録媒体に形成されたテスト記 録用マークのエッジシフト量を測定するエッジシフト検出回路と、前記エッジシフト検 出回路で測定された前記エッジシフト量が所定の範囲内にある力否かを判断し、前 記エッジシフト量が所定の範囲外である組み合わせにつ 、ては、測定された前記ェ ッジシフト量に基づいて新たに記録パラメータを設定する光記録媒体コントローラとを 備え、前記テスト記録用マークを、前記光記録媒体の外周エリアに形成することを特 徴とする。 The optical recording medium recording / reproducing apparatus of the present invention according to claim 2 records and reads data by a combination of a mark length and a space length formed on the optical recording medium, and physically or virtually records the optical recording medium. Is an optical recording medium recording / reproducing apparatus that records the data by changing the recording speed for each zone and defining a plurality of combinations of mark length and space length. Then, a recording compensation circuit that generates a recording pulse signal using the pattern generation circuit that outputs a recording pattern for test recording, the recording pattern that is input from the pattern generation circuit, and the set recording parameters. A circuit, a laser drive circuit for recording test recording data on the optical recording medium in accordance with the recording pulse signal, and reading the test recording data A voltage-controlled oscillator that generates a recovered clock signal based on the recovered signal obtained from the above, a phase comparator that detects a phase error between the recovered signal and the recovered clock signal as an edge shift amount, and a predetermined mark length A pattern detection circuit for identifying a signal pattern corresponding to a combination of a space length and a test record formed on the optical recording medium for each combination of a predetermined mark length and a space length identified by the pattern detection circuit. An edge shift detection circuit for measuring the edge shift amount of the recording mark and whether the edge shift amount measured by the edge shift detection circuit is within a predetermined range are determined. For combinations that are outside the predetermined range, an optical recording medium that newly sets recording parameters based on the measured edge shift amount. And a controller, the test recording marks, the feature to be formed on the outer circumference area of the optical recording medium.
請求項 3記載の本発明は、請求項 1に記載の光記録媒体記録再生装置にお!、て、 前記テスト記録を、前記光記録媒体の内周エリアでも行うことを特徴とする。 According to a third aspect of the present invention, in the optical recording medium recording / reproducing apparatus according to the first aspect, the test recording is also performed in an inner peripheral area of the optical recording medium.
請求項 4記載の本発明は、請求項 2に記載の光記録媒体記録再生装置において、
前記テスト記録を、前記光記録媒体の内周エリアでも行うことを特徴とする。 The present invention described in claim 4 is the optical recording medium recording / reproducing apparatus according to claim 2, The test recording is also performed in an inner peripheral area of the optical recording medium.
請求項 5記載の本発明は、請求項 3に記載の光記録媒体記録再生装置において、 前記光記録媒体の内周側に位置する前記ゾーンについての記録パラメータの設定 は、前記光記録媒体の内周エリアで行う前記テスト記録によって行い、前記光記録 媒体の外周側に位置する前記ゾーンにつ!ヽての記録パラメータの設定は、前記光記 録媒体の外周エリアで行う前記テスト記録によって行 、、前記光記録媒体の外周エリ ァで行う前記テスト記録は、短スペース長で短マーク長である特定の前記記録パラメ ータを対象として行うことを特徴とする。 The invention according to claim 5 is the optical recording medium recording / reproducing apparatus according to claim 3, wherein the setting of the recording parameter for the zone located on the inner circumference side of the optical recording medium Performed by the test recording performed in the peripheral area, the zone located on the outer peripheral side of the optical recording medium! All the recording parameters are set by the test recording performed in the outer peripheral area of the optical recording medium, and the test recording performed in the outer peripheral area of the optical recording medium has a short space length and a short mark length. It is characterized in that it is performed on specific recording parameters.
請求項 6記載の本発明は、請求項 4に記載の光記録媒体記録再生装置において、 前記光記録媒体の内周側に位置する前記ゾーンについての記録パラメータの設定 は、前記光記録媒体の内周エリアで行う前記テスト記録によって行い、前記光記録 媒体の外周側に位置する前記ゾーンにつ!ヽての記録パラメータの設定は、前記光記 録媒体の外周エリアで行う前記テスト記録によって行 、、前記光記録媒体の外周エリ ァで行う前記テスト記録は、短スペース長で短マーク長である特定の前記記録パラメ ータを対象として行うことを特徴とする。 According to a sixth aspect of the present invention, there is provided the optical recording medium recording / reproducing apparatus according to the fourth aspect, wherein the recording parameter setting for the zone located on the inner peripheral side of the optical recording medium Performed by the test recording performed in the peripheral area, the zone located on the outer peripheral side of the optical recording medium! All the recording parameters are set by the test recording performed in the outer peripheral area of the optical recording medium, and the test recording performed in the outer peripheral area of the optical recording medium has a short space length and a short mark length. It is characterized in that it is performed on specific recording parameters.
請求項 7記載の本発明の光記録媒体記録再生装置の記録パラメータ補正方法は 、光記録媒体に形成されるマーク長及びスペース長との組み合わせによってデータ の記録及び読み出しを行い、前記光記録媒体を物理的または仮想的に同心円状に 複数のゾーンに分割し、前記ゾーン毎に記録速度を変化させて前記データの記録を 行う光記録媒体記録再生装置の記録パラメータ補正方法であって、測定されたエツ ジシフト量に基づき、マーク長とスペース長との組ごとに記録パラメータを設定するス テツプと、前記内周または外周のフリーなエリアに前記記録パラメータ設定手段により 設定された記録パラメータによりテスト記録を行うステップと、前記記録媒体上に形成 された前記マークのエッジシフト量をマーク長とスペース長との組ごとにエッジシフト 量を測定するステップと、前記測定したエッジシフト量が最小となるように前記記録パ ラメータ設定手段の記録パラメータを補正するステップと、を含むことを特徴とする。 発明の効果 The recording parameter correction method of the optical recording medium recording / reproducing apparatus of the present invention according to claim 7 records and reads data according to a combination of a mark length and a space length formed on the optical recording medium, and the optical recording medium A recording parameter correction method for an optical recording medium recording / reproducing apparatus for recording the data by physically or virtually concentrically dividing the zone into a plurality of zones and changing the recording speed for each of the zones. Based on the amount of edge shift, test recording is performed using a step for setting recording parameters for each set of mark length and space length, and recording parameters set by the recording parameter setting means in the free area on the inner periphery or outer periphery. And an edge shift amount of the mark formed on the recording medium for each set of mark length and space length. Measuring the edge shift amount, and correcting the recording parameter of the recording parameter setting means so that the measured edge shift amount is minimized. The invention's effect
本発明の光記録媒体記録再生装置によれば、 DVD— R、 DVD+Rの高倍速の記
録において外周の記録領域でジッタ悪ィ匕を防いで記録品位の向上が可能となり、高 倍速記録を実現できる。 According to the optical recording medium recording / reproducing apparatus of the present invention, high-speed recording of DVD-R and DVD + R is possible. In recording, it is possible to improve the recording quality by preventing jitter in the recording area on the outer periphery, and realize high-speed recording.
図面の簡単な説明 Brief Description of Drawings
[0007] [図 1]本発明の一実施形態の光記録媒体記録再生装置のブロック図 FIG. 1 is a block diagram of an optical recording medium recording / reproducing apparatus according to an embodiment of the present invention.
[図 2]本実施形態の光記録媒体記録再生装置に用いる光記録媒体の概念構成図 FIG. 2 is a conceptual configuration diagram of an optical recording medium used in the optical recording medium recording / reproducing apparatus of the present embodiment.
[図 3]本実施形態のジッタ分布効果を示す図 FIG. 3 is a diagram showing the jitter distribution effect of this embodiment.
[図 4]従来の光ディスクドライブの構成図 [Fig.4] Configuration of conventional optical disk drive
[図 5]従来の記録パラメータの校正動作を説明するための図 [Fig. 5] Diagram for explaining the conventional calibration of recording parameters
[図 6]従来の記録パラメータの校正動作を説明するための別の図 [Figure 6] Another diagram for explaining the calibration operation of the conventional recording parameters
符号の説明 Explanation of symbols
[0008] 18 位相比較器 [0008] 18 phase comparator
21 電圧制御発振器 21 Voltage controlled oscillator
23 パターン検出回路 23 Pattern detection circuit
24 エッジシフト検出回路 24 Edge shift detection circuit
25 光記録媒体コントローラ 25 Optical recording media controller
26 パターン発生回路 26 Pattern generator
27 記録補償回路 27 Recording compensation circuit
28 レーザ駆動回路 28 Laser drive circuit
発明を実施するための最良の形態 BEST MODE FOR CARRYING OUT THE INVENTION
[0009] 以下、図面を参照しながら、本発明の一実施形態の光記録媒体記録再生装置を 説明する。 Hereinafter, an optical recording medium recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.
高倍速記録時の動作を説明するために、低倍速記録時に内周のテストエリアを使 用した記録パラメータの校正動作について説明する。 In order to explain the operation during high-speed recording, the recording parameter calibration operation using the inner test area during low-speed recording will be explained.
図 1は本実施形態の光記録媒体記録再生装置のブロック図、図 2は本実施形態の 光記録媒体記録再生装置に用いる光記録媒体の概念構成図、図 3は本実施形態の ジッタ分布効果を示す図である。 FIG. 1 is a block diagram of an optical recording medium recording / reproducing apparatus of the present embodiment, FIG. 2 is a conceptual configuration diagram of an optical recording medium used in the optical recording medium recording / reproducing apparatus of the present embodiment, and FIG. 3 is a jitter distribution effect of the present embodiment. FIG.
[0010] 光ディスク装置 100は、光ディスク 14が装填されたときに、記録パラメータを最適化 するための校正動作 (テスト記録)を行う。このテスト記録において、パターン発生回
路 26から入力された所定の記録パターンと、初期設定された記録パラメータとを用い て、記録補償回路 27によって記録パルス信号が生成される。本実施形態で用いられ るテスト記録用の記録パターンは、例えば、 4Tマーク、 3Tスペース、 4Tマーク、 4T スペース、 4Tマーク、 5Tスペース' · ·(以下、 4m3s4m4s4m5s ' · ·というように示す 場合もある)というように、それぞれ互いに異なる、マーク長とスペース長との複数の組 を含むように規定されている。本実施形態では、 4m3sの組、 4m4sの組、 4m5sの組 などが含まれている。さらに、この記録パターンは、 DSV (Digital Sum Value)が 0となるように構成されて!、る。 The optical disc apparatus 100 performs a calibration operation (test recording) for optimizing the recording parameters when the optical disc 14 is loaded. In this test record, the pattern generation times A recording pulse signal is generated by the recording compensation circuit 27 using a predetermined recording pattern input from the path 26 and the recording parameters that are initially set. The recording pattern for test recording used in this embodiment is, for example, 4T mark, 3T space, 4T mark, 4T space, 4T mark, 5T space '(hereinafter also referred to as 4m3s4m4s4m5s'). It is specified to include multiple sets of mark length and space length, which are different from each other. In this embodiment, a 4m3s group, a 4m4s group, a 4m5s group, and the like are included. In addition, this recording pattern is configured so that DSV (Digital Sum Value) is 0! RU
レーザ駆動回路 28は、このようにして生成されたレーザ発光制御ノ ルス信号に応 じて光ヘッド 13を駆動し、光ディスク 14に所定のデータを記録する。光ディスク装置 100は、いわゆるマークエッジ記録方式を採用し、光ディスク 14には、所定のデータ に対応する、長さの異なる複数のマーク及びスペースが形成される。次に、各記録パ ラメータを最適化するために、上記光ディスク 14に記録された所定のデータを再生し 、得られた再生信号力もパラメータの適否を判断する。このために、まず、光ヘッド 13 を用いて再生用レーザが光ディスク 14上に照射される。光ディスク 14上に記録され た所定のデータからの反射光は、光ヘッド 13において再生信号に変換される。この 再生信号は、増幅された後に波形等化器 15により波形整形される。波形整形された 再生信号は、アナログ デジタル変換器 (AZD変換器) 16によって標本ィ匕及び量 子化され、これにより、 AZD変換器 16からは、多値レベルを有するデータがデジタ ル信号として出力される。なお、 AZD変換器 16におけるサンプリング周波数は、フィ ードバック制御される VCO (電圧制御発振器) 21からの出力(再生クロック信号)に基 づいて設定される。高域通過フィルタ 17は、 AZD変翻16から出力された信号に 含まれる不要な低周波数成分を除去する。高域通過フィルタ 17からの出力は、 PLL 回路 40の一部を構成する位相比較器 18及び記録パラメータ設定ブロック 50へと入 力される。位相比較器 18は、入力されたデジタル信号に基づいて、再生信号と再生 クロック信号 (すなわち VC021の出力)との間の位相誤差を検出する。 LPF (ローバ スフィルタ) 19は、検出された位相誤差から VC021が追従すべき周波数を決定する 。 LPF19から出力された信号は、デジタル—アナログ変 m^ (DZA変翻) 20でァ
ナログ信号に変換される。このアナログ信号により VC021が制御され、再生クロック を生成する。このように本実施形態では、位相比較器 18、 LPF19、 VC021によって PLL回路 40が構成されている。 PLL回路 40において、 VC021から出力される再生 クロック信号は、再生信号との位相誤差が全体として 0に近づくように (すなわち、再 生信号における各極性反転部分で測定される位相誤差の累積値または平均値が 0 に近づくように)フィードバック制御される。このようにして、再生信号に基づいて、再 生信号と同期が取られたクロック信号が生成される。ただし、上述のように再生信号と クロック信号との全体的な位相誤差を抑制した場合にも、再生信号の各極性反転部 分においてクロック信号との位相誤差が生じる。この位相誤差は、記録パラメータが 適切でないことなどによって、マークのエッジが適切な位置からシフトしていることによ つて生じる。従って、それぞれの極性反転部分での位相誤差を検出すれば、対応す るそれぞれのマークのエッジシフトを検出することができる。また、マークのエッジシフ トの程度及び方向は、位相誤差の大きさ及びその符号 (極性)によって示される。従 つて、位相誤差を測定すれば、対応するマークのエッジの位置力 理想的なマーク のエッジ位置に対して、いずれの方向にどの程度ずれているかを示す値(以下、エツ ジシフト量と ヽぅ)を得ることができる。 The laser drive circuit 28 drives the optical head 13 in accordance with the laser emission control noise signal generated in this way, and records predetermined data on the optical disk 14. The optical disc apparatus 100 employs a so-called mark edge recording method, and a plurality of marks and spaces having different lengths corresponding to predetermined data are formed on the optical disc 14. Next, in order to optimize each recording parameter, predetermined data recorded on the optical disc 14 is reproduced, and the obtained reproduction signal power also determines whether the parameter is appropriate. For this purpose, first, the reproducing laser is irradiated onto the optical disk 14 using the optical head 13. Reflected light from predetermined data recorded on the optical disc 14 is converted into a reproduction signal by the optical head 13. The reproduced signal is amplified and then shaped by the waveform equalizer 15. The waveform-shaped playback signal is sampled and quantized by an analog-to-digital converter (AZD converter) 16, and as a result, multi-level data is output as a digital signal from the AZD converter 16. Is done. The sampling frequency in the AZD converter 16 is set based on an output (reproduced clock signal) from a VCO (voltage controlled oscillator) 21 that is feedback controlled. The high-pass filter 17 removes unnecessary low-frequency components contained in the signal output from the AZD transformation 16. The output from the high-pass filter 17 is input to the phase comparator 18 and the recording parameter setting block 50 that constitute a part of the PLL circuit 40. The phase comparator 18 detects a phase error between the reproduction signal and the reproduction clock signal (that is, the output of VC021) based on the input digital signal. LPF (low-pass filter) 19 determines the frequency that VC021 should follow from the detected phase error. The signal output from LPF19 is digital-analog conversion m ^ (DZA conversion) 20 Converted to a analog signal. VC021 is controlled by this analog signal, and a regenerated clock is generated. Thus, in this embodiment, the PLL circuit 40 is configured by the phase comparator 18, LPF 19, and VC021. In the PLL circuit 40, the recovered clock signal output from the VC021 is adjusted so that the phase error from the recovered signal approaches 0 as a whole (that is, the accumulated value of the phase error measured at each polarity inversion portion of the recovered signal or Feedback control is performed so that the average value approaches zero. In this way, a clock signal synchronized with the reproduction signal is generated based on the reproduction signal. However, even when the overall phase error between the reproduction signal and the clock signal is suppressed as described above, a phase error from the clock signal occurs in each polarity inversion portion of the reproduction signal. This phase error is caused by the mark edge being shifted from its proper position, for example due to improper recording parameters. Therefore, if a phase error at each polarity inversion portion is detected, an edge shift of each corresponding mark can be detected. The degree and direction of the mark edge shift is indicated by the magnitude of the phase error and its sign (polarity). Therefore, if the phase error is measured, the position force of the corresponding mark edge is a value indicating how much the edge position of the ideal mark is shifted in which direction (hereinafter referred to as the edge shift amount and ヽ ぅ). ) Can be obtained.
[0012] このように、本実施形態では、マークのエッジシフト量を、記録媒体上のデータを再 生した信号とクロック信号との位相誤差として検出する。なお、本実施形態において、 位相誤差とは、再生信号の極性反転部分における、再生クロック信号の立ち上がり エッジ (AZD変翻 16におけるサンプリングのタイミングに対応)との時間軸上のず れを意味する。 As described above, in this embodiment, the edge shift amount of the mark is detected as a phase error between a signal obtained by reproducing data on the recording medium and the clock signal. In the present embodiment, the phase error means a shift on the time axis with respect to the rising edge of the recovered clock signal (corresponding to the sampling timing in the AZD conversion 16) in the polarity inversion portion of the recovered signal.
[0013] 次に、エッジシフト量を求めることによって記録パラメータを最適化する記録パラメ ータ設定ブロック 50について説明する。 Next, the recording parameter setting block 50 that optimizes the recording parameter by obtaining the edge shift amount will be described.
記録パラメータ設定ブロック 50において、 2値ィ匕回路 22は、高域通過フィルタ 17か ら入力されるデジタル再生信号を 2値ィ匕することによって、記録パターンに対応する 2 値化データを再生する。このようにして得られた 2値ィ匕データに基づいて、パターン 検出回路 23は所定のマーク長とスペース長との組み合わせに対応する信号パター ンを識別することができる。
また、エッジシフト検出回路 24は、パターン検出回路 23で識別された所定のマーク 長とスペース長との組み合わせ毎に上述の位相誤差を累積加算する。これによつて 、記録媒体上に形成されたマークのエッジシフト量を、マーク長とスペース長との組ご と〖こ柳 J定することができる。 In the recording parameter setting block 50, the binarization circuit 22 reproduces binarized data corresponding to the recording pattern by binarizing the digital reproduction signal inputted from the high-pass filter 17. Based on the binary key data obtained in this way, the pattern detection circuit 23 can identify a signal pattern corresponding to a combination of a predetermined mark length and space length. Further, the edge shift detection circuit 24 accumulates and adds the above-described phase error for each combination of the predetermined mark length and space length identified by the pattern detection circuit 23. Thus, the edge shift amount of the mark formed on the recording medium can be determined for each set of mark length and space length.
光記録媒体コントローラ 25は、マーク長とスペース長との組み合わせ、及び、マーク 始端エッジまたはマーク終端エッジの 、ずれであるかの組み合わせ (すなわち、記録 パラメータのそれぞれに対応する組み合わせ)毎に、エッジシフト量が所定の範囲内 にあるカゝ否かを判断する。所定の範囲内にある場合、その組み合わせに対応付けら れた記録パラメータは適切であると判断して更新しない。一方、所定の範囲内にない 場合、その組み合わせに対応付けられた記録パラメータは変更が必要であると判断 される。光記録媒体コントローラ 25は、変更が必要と判断された記録パラメータのみ を更新するように動作する。光記録媒体コントローラ 25は、測定されたエッジジフト量 に基づいて、マーク長とスペース長との組ごとに記録パラメータを設定する。光記録 媒体コントローラ 25は、必要に応じて更新された記録パラメータを記録補償回路 27 に出力する。記録補償回路 27は、光記録媒体コントローラ 25から得られる記録パラ メータに基づいて、記録パルス信号を生成する。このようにして生成された記録パル ス信号を用いてさらにテスト記録が続けられる。その後、上述と同様の動作によって 記録パラメータの適否が判断され、そこで更新すべきパラメータがある場合にはさら にテスト記録を行う。このようにして、全ての記録パラメータの最適化が行われる。 The optical recording medium controller 25 performs edge shift for each combination of the mark length and the space length, and whether the mark start edge or mark end edge is shifted (that is, the combination corresponding to each recording parameter). Determine whether the amount is within the specified range. If it is within the predetermined range, the recording parameter associated with the combination is judged to be appropriate and is not updated. On the other hand, if it is not within the predetermined range, it is determined that the recording parameter associated with the combination needs to be changed. The optical recording medium controller 25 operates so as to update only the recording parameters determined to be changed. The optical recording medium controller 25 sets recording parameters for each set of mark length and space length based on the measured edge shift amount. The optical recording medium controller 25 outputs the recording parameters updated as necessary to the recording compensation circuit 27. The recording compensation circuit 27 generates a recording pulse signal based on the recording parameters obtained from the optical recording medium controller 25. The test recording is continued using the recording pulse signal thus generated. Thereafter, whether or not the recording parameters are appropriate is determined by the same operation as described above, and if there are parameters to be updated there, further test recording is performed. In this way, all recording parameters are optimized.
[0014] 以上に説明したように、本実施形態の光ディスク装置 100では、記録パラメータ毎 に異なる記録パターンを用いるのではなぐマーク長とスペース長との複数の組を含 むように規定された所定の記録パターンを用いてテスト記録が行われる。このとき、マ ーク長とスペース長との組み合わせ毎にエッジシフト量を検出することによって、いず れの組み合わせでのマークのエッジがどちらの方向にどの程度シフトしているかを検 出することができる。これによつて、複数の記録パラメータのうちの補正すべき記録パ ラメータを選另 IJすることがでさる。 [0014] As described above, in the optical disc apparatus 100 of the present embodiment, the predetermined recording defined to include a plurality of sets of mark length and space length that does not use a different recording pattern for each recording parameter. Test recording is performed using the pattern. At this time, by detecting the edge shift amount for each combination of the mark length and the space length, it is possible to detect how much the edge of the mark in which combination is shifted in which direction. Can do. As a result, the recording parameter to be corrected among a plurality of recording parameters can be selected IJ.
[0015] 次に、図 2及び図 3を参照しながら高倍速記録パラメータの設定方法について説明 する。
高倍速の記録 (記録媒体の半径位置により記録速度が変わる記録)の場合、低倍 速記録の範囲(ZONE A54を記録する速度)では最内周のテストエリア 52にて上 記のように記録媒体上に形成されるマーク及びスペースのパターン毎に最適な記録 ノ メータを設定することが可能である力 高倍速記録エリアである ZONE B55及 び ZONE C56における記録倍速では、モータの能力の関係で内周のテストエリア 5 2では記録パラメータの最適化が行えない。なお、高倍速記録エリアである ZONE B55及び ZONE C56がユーザデータエリア 52である。 Next, a method for setting high-speed recording parameters will be described with reference to FIGS. 2 and 3. In the case of high-speed recording (recording speed varies depending on the radial position of the recording medium), recording is performed in the test area 52 on the innermost circumference as described above in the low-speed recording range (speed at which ZONE A54 is recorded). The ability to set an optimal recording meter for each mark and space pattern formed on the medium The recording speed of ZONE B55 and ZONE C56, which are high-speed recording areas, depends on the motor capacity. The recording parameters cannot be optimized in the inner test area 52. The high-speed recording area ZONE B55 and ZONE C56 are the user data area 52.
[0016] 本実施形態では、外周のテストエリア 51を用いて、高倍速記録エリアの最適化を行 う。低倍速記録部で行っている記録パラメータの校正を内周の ZONE A54以外の ZONE毎に行うと膨大な時間を要するため、現実的には使用できない。そこで本実 施形態では、高倍速記録部では、 3Tスペースの直前のマークの立ち下がりと、 3Tス ペースの直後のマークの立ち上がり部のみ制御する。 DVD-R, DVD+Rの高倍 速記録においては、熱干渉によってマーク部の後端が後ろににじみやすぐマーク 部前端は、前ににじみやすい。このため特に出現率が高くて短い 3Tスペースは、(G 1)のような 2. 8スペースなど少し短い擬似スペースができやすぐこれがジッタを 悪ィ匕させている。本発明では、 3Tスペース依存のパラメータの位相誤差を測定し、 常にこれが最小となるように記録パラメータの校正を実施することにより、 (G 2)のよ うなジッタ分布を実現でき、短時間で高倍速記録部のパラメータの最適化を行え、記 録媒体のロット違いや、記録再生装置のばらつきも吸収することが可能である。 産業上の利用可能性 In the present embodiment, the outer periphery test area 51 is used to optimize the high-speed recording area. If the calibration of the recording parameters performed in the low-speed recording unit is performed for each zone other than the inner zone ZONE A54, it takes an enormous amount of time and cannot be used in practice. Therefore, in the present embodiment, the high-speed recording unit controls only the trailing edge of the mark immediately before the 3T space and the leading edge of the mark immediately after the 3T space. In high-speed recording of DVD-R and DVD + R, the rear end of the mark part bleeds back and the front end of the mark part easily bleeds forward due to thermal interference. For this reason, a 3T space with a particularly high appearance rate and a short 3T space has a slightly short pseudo space such as a 2.8 space as in (G 1), which immediately deteriorates the jitter. In the present invention, by measuring the phase error of a 3T space-dependent parameter and calibrating the recording parameter so that it always becomes the minimum, a jitter distribution like (G2) can be realized, and high in a short time. It is possible to optimize the parameters of the double-speed recording unit, and to absorb differences in recording medium lots and variations in recording and playback devices. Industrial applicability
[0017] 本発明に力かる光ディスク記録再生装置は、 DVD— R、 dvd+rの更なる高倍速ィ匕 にお 、て、最低限の記録パラメータのみ最適化を行うのでを記録パラメータの校正を 短時間で行うことができる。
[0017] The optical disk recording / reproducing apparatus that is useful for the present invention optimizes only the minimum recording parameters in the DVD-R and dvd + r with a higher double speed speed. It can be done in a short time.
Claims
[1] 光記録媒体に形成されるマーク長及びスペース長との組み合わせによってデータ の記録及び読み出しを行い、前記光記録媒体を物理的または仮想的に同心円状に 複数のゾーンに分割し、前記ゾーン毎に記録速度を変化させて前記データの記録を 行う光記録媒体記録再生装置であって、 [1] Data is recorded and read according to a combination of a mark length and a space length formed on the optical recording medium, and the optical recording medium is physically or virtually concentrically divided into a plurality of zones. An optical recording medium recording / reproducing apparatus for recording the data by changing a recording speed every time,
前記光記録媒体に形成されたテスト記録用マークのエッジシフト量をマーク長とスぺ ース長との組み合わせごとに測定するエッジシフト検出回路と、 An edge shift detection circuit for measuring an edge shift amount of a test recording mark formed on the optical recording medium for each combination of a mark length and a space length;
測定された前記エッジシフト量に基づき、マーク長とスペース長との組み合わせごと に記録パラメータを設定する光記録媒体コントローラとを備え、 An optical recording medium controller that sets recording parameters for each combination of mark length and space length based on the measured edge shift amount;
前記テスト記録用マークを、前記光記録媒体の外周エリアに形成することを特徴とす る光記録媒体記録再生装置。 An optical recording medium recording / reproducing apparatus, wherein the test recording mark is formed in an outer peripheral area of the optical recording medium.
[2] 光記録媒体に形成されるマーク長及びスペース長との組み合わせによってデータ の記録及び読み出しを行い、前記光記録媒体を物理的または仮想的に同心円状に 複数のゾーンに分割し、前記ゾーン毎に記録速度を変化させて前記データの記録を 行う光記録媒体記録再生装置であって、 [2] Data is recorded and read by a combination of a mark length and a space length formed on the optical recording medium, and the optical recording medium is physically or virtually concentrically divided into a plurality of zones, and the zones An optical recording medium recording / reproducing apparatus for recording the data by changing a recording speed every time,
マーク長とスペース長との複数の組み合わせを規定しているテスト記録用の記録パタ ーンを出力するパターン発生回路と、 A pattern generation circuit that outputs a recording pattern for test recording that defines a plurality of combinations of mark length and space length;
前記パターン発生回路から入力された前記記録パターンと、設定された記録パラメ 一タとを用いて記録パルス信号を生成する記録補償回路と、 A recording compensation circuit that generates a recording pulse signal using the recording pattern input from the pattern generation circuit and a set recording parameter;
前記記録パルス信号に応じて前記光記録媒体にテスト記録用データを記録するレー ザ駆動回路と、 A laser driving circuit for recording test recording data on the optical recording medium in response to the recording pulse signal;
前記テスト記録用データを読み出すことで得られる再生信号に基づいて再生クロック 信号を生成する電圧制御発振器と、 A voltage controlled oscillator that generates a reproduction clock signal based on a reproduction signal obtained by reading the test recording data;
前記再生信号と前記再生クロック信号との間の位相誤差をエッジシフト量として検出 する位相比較器と、 A phase comparator that detects a phase error between the reproduced signal and the reproduced clock signal as an edge shift amount;
所定のマーク長とスペース長との組み合わせに対応する信号パターンを識別するパ ターン検出回路と、 A pattern detection circuit for identifying a signal pattern corresponding to a combination of a predetermined mark length and space length;
前記パターン検出回路で識別された所定のマーク長とスペース長との組み合わせご
とに前記光記録媒体に形成されたテスト記録用マークのエッジシフト量を測定するェ ッジシフト検出回路と、 A combination of a predetermined mark length and a space length identified by the pattern detection circuit And an edge shift detection circuit for measuring an edge shift amount of a test recording mark formed on the optical recording medium,
前記エッジシフト検出回路で測定された前記エッジシフト量が所定の範囲内にあるか 否かを判断し、前記エッジシフト量が所定の範囲外である組み合わせにつ 、ては、 測定された前記エッジシフト量に基づいて新たに記録パラメータを設定する光記録 媒体コントローラとを備え、 It is determined whether or not the edge shift amount measured by the edge shift detection circuit is within a predetermined range, and for the combination in which the edge shift amount is outside the predetermined range, the measured edge An optical recording medium controller that newly sets recording parameters based on the shift amount,
前記テスト記録用マークを、前記光記録媒体の外周エリアに形成することを特徴とす る光記録媒体記録再生装置。 An optical recording medium recording / reproducing apparatus, wherein the test recording mark is formed in an outer peripheral area of the optical recording medium.
[3] 前記テスト記録を、前記光記録媒体の内周エリアでも行うことを特徴とする請求項 1 に記載の光記録媒体記録再生装置。 3. The optical recording medium recording / reproducing apparatus according to claim 1, wherein the test recording is also performed in an inner peripheral area of the optical recording medium.
[4] 前記テスト記録を、前記光記録媒体の内周エリアでも行うことを特徴とする請求項 2 に記載の光記録媒体記録再生装置。 4. The optical recording medium recording / reproducing apparatus according to claim 2, wherein the test recording is also performed in an inner peripheral area of the optical recording medium.
[5] 前記光記録媒体の内周側に位置する前記ゾーンにつ!、ての記録パラメータの設 定は、前記光記録媒体の内周エリアで行う前記テスト記録によって行い、 前記光記録媒体の外周側に位置する前記ゾーンについての記録パラメータの設定 は、前記光記録媒体の外周エリアで行う前記テスト記録によって行 ヽ、 [5] For the zone located on the inner peripheral side of the optical recording medium, the recording parameters are set by the test recording performed in the inner peripheral area of the optical recording medium, The recording parameters for the zone located on the outer peripheral side are set by the test recording performed in the outer peripheral area of the optical recording medium.
前記光記録媒体の外周エリアで行う前記テスト記録は、短スペース長で短マーク長 である特定の前記記録パラメータを対象として行うことを特徴とする請求項 3に記載の 光記録媒体記録再生装置。 4. The optical recording medium recording / reproducing apparatus according to claim 3, wherein the test recording performed in an outer peripheral area of the optical recording medium is performed on a specific recording parameter having a short space length and a short mark length.
[6] 前記光記録媒体の内周側に位置する前記ゾーンにつ!、ての記録パラメータの設 定は、前記光記録媒体の内周エリアで行う前記テスト記録によって行い、 前記光記録媒体の外周側に位置する前記ゾーンについての記録パラメータの設定 は、前記光記録媒体の外周エリアで行う前記テスト記録によって行 ヽ、 [6] For the zone located on the inner peripheral side of the optical recording medium, the recording parameters are set by the test recording performed in the inner peripheral area of the optical recording medium. The recording parameters for the zone located on the outer peripheral side are set by the test recording performed in the outer peripheral area of the optical recording medium.
前記光記録媒体の外周エリアで行う前記テスト記録は、短スペース長で短マーク長 である特定の前記記録パラメータを対象として行うことを特徴とする請求項 4に記載の 光記録媒体記録再生装置。 5. The optical recording medium recording / reproducing apparatus according to claim 4, wherein the test recording performed in an outer peripheral area of the optical recording medium is performed on a specific recording parameter having a short space length and a short mark length.
[7] 光記録媒体に形成されるマーク長及びスペース長との組み合わせによってデータ の記録及び読み出しを行い、前記光記録媒体を物理的または仮想的に同心円状に
複数のゾーンに分割し、前記ゾーン毎に記録速度を変化させて前記データの記録を 行う光記録媒体記録再生装置の記録パラメータ補正方法であって、 [7] Data is recorded and read by a combination of a mark length and a space length formed on the optical recording medium, and the optical recording medium is physically or virtually concentrically formed. A recording parameter correction method for an optical recording medium recording / reproducing apparatus that divides a plurality of zones and records the data by changing a recording speed for each of the zones,
測定されたエッジシフト量に基づき、マーク長とスペース長との組ごとに記録パラメ一 タを設定するステップと、 Setting recording parameters for each set of mark length and space length based on the measured edge shift amount;
前記内周または外周のフリーなエリアに記録パラメータ設定手段により設定された記 録パラメータによりテスト記録を行うステップと、 Performing test recording with the recording parameters set by the recording parameter setting means in the inner or outer free area;
前記記録媒体上に形成された前記マークのエッジシフト量をマーク長とスペース長と の糸且ごとにエッジシフト量を測定するステップと、 Measuring an edge shift amount of the mark formed on the recording medium for each edge of the mark length and the space length;
前記測定したエッジシフト量が最小となるように前記記録パラメータ設定手段の記録 パラメータを補正するステップと、 Correcting the recording parameters of the recording parameter setting means so that the measured edge shift amount is minimized;
を含むことを特徴とする光記録媒体記録再生装置の記録パラメータ補正方法。
A recording parameter correction method for an optical recording medium recording / reproducing apparatus.
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