JP4014440B2 - Information recording apparatus, information recording method, and information recording system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information recording apparatus, an information recording method, and an information recording system for recording on an optical disc that is a recording medium.
[0002]
[Prior art]
In recent years, in the field of information recording apparatuses, recordable optical discs such as CD-R and rewritable optical discs such as CD-RW have been put into practical use as recording media. Recently, by shortening the wavelength of a semiconductor laser as a laser light source, reducing the spot diameter with a high NA objective lens having a high numerical aperture, and adopting a thin substrate, DVD-R, DVD-RW, Large capacity optical disks such as DVD-RAM are used in information recording apparatuses.
[0003]
For example, recording of information on a DVD-R, which is one of recording media having a dye recording layer (dye-based recording medium), is performed by a mark edge recording method in which information is recorded at the beginning and end of a mark on the recording medium. ing. In recording on such a large-capacity optical disk, there is a pulse control system that adjusts the laser intensity in accordance with the quality of the optical disk to be used in consideration of poor mark formation due to insufficient heat storage and cooling speed of the recording medium. It has been put into practical use. This pulse control system performs laser on / off control at fine intervals in order to adjust the laser intensity. In this pulse control system, a laser emission waveform rule (hereinafter referred to as a write strategy) using a multi-pulse composed of a pulse train composed of a combination of a leading heating pulse and a plurality of subsequent continuous heating pulses has been proposed. As a pulse control method, a method of changing the pulse width of the leading heating pulse according to the length of the mark and the length of the space immediately before or after the mark has been proposed.
[0004]
When recording is performed on a dye-based recording medium or a phase change recording medium, the recording conditions differ depending on the ambient temperature, the type of the recording medium, and the like, and the optimum write strategy at that time also differs. Japanese Patent Publication No. 2000-207742 discloses an information recording method for determining a different write strategy for each recording time. FIG. 18 is a block diagram showing a configuration of an information recording apparatus disclosed in Japanese Patent Publication No. 2000-207742. FIG. 19 is a block diagram showing a configuration of a controller in the information recording apparatus of FIG.
[0005]
In the conventional information recording apparatus, when determining the write strategy, for example, when determining the light emission power (recording power) at the time of recording, it is determined by adjusting the asymmetry generated in the signal when the recording area is reproduced. Further, when determining the light emission waveform rule, it is determined by adjusting the jitter generated in the signal when the recording area is reproduced. In the conventional information recording apparatus, asymmetry and jitter are caused by marks and spaces from 3 times (3T) to 11 times (11T) and 14 times (14T) the period (T) of the channel clock as the data extraction clock signal. The configured predetermined pattern (test pattern) is test-written (recorded) with several types of recording power, and data for each recording power is measured using a reproduction signal of the predetermined pattern. FIG. 20 is a waveform diagram showing measured values of asymmetry (a) and jitter (b) in a conventional information recording apparatus. In FIG. 20, the upper waveform in (a) shows the measured asymmetry [%], and the lower waveform shows the position of the focal point [μm]. Further, the upper waveform in FIG. 20B indicates the measured jitter [%], and the lower waveform indicates the inclination [deg] of the optical disc. Each waveform in FIG. 20 is a measured value for one rotation of the optical disk.
[0006]
As shown in FIGS. 20A and 20B, the test pattern playback signal is affected by stress during recording and playback, for example, defocus that is a defocus, tilt of the disk track in the close-contact direction, and the like. As a result, values such as asymmetry and jitter change.
Since the values of asymmetry and jitter change as shown in FIG. 20, the conventional information recording apparatus calculates the average values of asymmetry and jitter, and uses the calculated average asymmetry and average jitter. Thus, the recording power and the light emission waveform rule were determined. In the conventional information recording apparatus, in order to remove the AC component of the stress caused by the rotation of the disk, asymmetry and jitter are detected over one rotation of the disk, and the average values of the asymmetry and jitter are used. The write strategy for the disc was determined.
[0007]
Therefore, according to the method for determining the write strategy (laser emission waveform rule) in the conventional information recording apparatus, it is necessary to perform many trial writings in order to obtain the optimum recording conditions. For example, when recording one rotation of data for one condition, it is necessary to use ten or more tracks as a learning area for one learning. Further, a write-once optical disc such as a DVD-R has a restriction that it cannot be re-recorded on a track once recorded, and there is only a small area reserved for adjustment. Therefore, in the conventional information recording apparatus, when trying to cope with the incremental writing, it is necessary to make the learning area used for determining the write strategy (laser emission waveform rule) as small as possible. .
[0008]
[Problems to be solved by the invention]
In a conventional information recording apparatus, for example, in an optical disc such as a DVD-R, an area that can be used as a learning area is a PCA (Power Calibration Area) that is secured as an area for adjusting write power, and the PCA is 7056. Is a sector. In the conventional information recording apparatus, an information recording method for determining the write strategy as described above using the 7056 sector of the PCA as a learning area has been used. However, in this area alone, it was not possible to perform sufficient learning to determine the write strategy. Even if trial writing is performed by changing only a parameter with a high contribution ratio in determining the write strategy, the conventional information recording method cannot obtain a sufficient number of learning times, and an appropriate write strategy is not obtained. Could not be determined.
[0009]
The present invention is an information recording apparatus capable of determining an optimum write strategy (laser emission waveform rule) for each recording time with a smaller number of trial writings compared to a conventional information recording method, and further optimizing recording conditions, An object is to provide an information recording method and an information recording system.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, an information recording apparatus according to the present invention provides:
  In an information recording apparatus using a mark edge recording method for recording information on a leading edge and a trailing edge of a mark on a recording medium,
  Recording that records recording data by irradiating the recording surface of the recording medium with laser light based on a recorded pulse length and a recording pulse train determined according to a space length immediately before or after the recorded mark Part,
  A reproduction unit for outputting a reproduction RF signal from the recording medium;
  A data extraction clock signal is generated from the reproduction RF signal from the reproduction unit, and a phase difference between the reproduction RF signal and the data extraction clock signal is detected as a phase error for each combination of the mark length and the space length before and after the mark. Phase error detector,
  From the reproduction RF signal, asymmetryOrModulation degreeofA recording power optimization unit that extracts information that changes according to the recording power and determines the recording power so that the extracted information has a predetermined value;
  A recording compensation parameter for determining a light emission waveform rule for the recording medium by adjusting a recording compensation parameter based on phase error data detected for each combination of a mark length from the phase error detection unit and a space length before and after the mark Adjustment section,
  Recording pulse train correction for correcting the recording pulse train based on the light emission waveform rule determined by the recording compensation parameter adjustment unitPart,
  A laser driving unit that is driven by the recording pulse train formed by the recording pulse train correcting unit and irradiates the recording medium with a desired laser according to the recording power determined by the recording power optimization unit;
  The phase error data for each combination of the mark length from the phase error detection unit and the space length before and after the mark is determined according to the target asymmetry for each combination of the mark length from the recording power optimization unit and the space length before and after the mark. A phase error adjustment unit for adjusting the phase error, and
  A rotational phase detector for detecting the rotational phase of the mounted recording medium,
  The phase error adjustment unit applies an offset to the output of the phase error detection unit according to target asymmetry based on the rotation phase data from the rotation phase detection unit, and outputs the offset to the recording compensation parameter adjustment unit.The phase error for each rotational phase of the recording medium is adjusted.
[0013]
  otherAn information recording apparatus according to the present invention from the viewpoint of
  In an information recording apparatus using a mark edge recording method for recording information on the leading edge and the trailing edge of a mark on an optical disk as a recording medium,
  A recording unit that records recording data by irradiating the recording surface of the optical disc with laser light based on a recorded pulse length and a recording pulse train determined according to a space length immediately before or after the recorded mark ,
  A reproducing unit for reproducing information recorded on the recording medium and outputting a reproduction RF signal;
  In a recording pulse train determined for each recording medium, asymmetry is obtained from the reproduction RF signal.OrModulation degreeofA recording power optimization unit that extracts information that changes according to the recording power and determines the recording power so that the extracted information has a predetermined value;
  A phase in which a data extraction clock signal is generated from the reproduction RF signal, and a phase difference between the reproduction RF signal and the data extraction clock signal is detected as a phase error for each combination of a mark length and a space length immediately before or after the mark. Error detector,
  Detect the rotational phase of the loaded recording medium,A rotational phase detector that measures a rotational fluctuation component of the phase error detector in accordance with a detected phase error in a recording area for one rotation recorded on the optical disc under the same conditions;
  Based on the rotational phase data from the rotational phase detector, an offset to be applied to the output of the phase error detector is set according to target asymmetry, and the phase error for each rotational phase of the recording medium is adjusted.Phase error adjuster,
  The recording power determined by the recording power optimization unit is compensated by the phase error adjustment unit.For each rotational phase of the recording mediumA recording compensation parameter adjusting unit for determining an optimum light emission waveform rule based on the phase error, and
  A recording pulse train correction unit that corrects the recording pulse train based on the light emission waveform rule determined by the recording compensation parameter adjustment unit.
[0014]
  An information recording method according to the present invention includes:
  In an information recording method using a mark edge recording method for recording information on a leading edge and a trailing edge of a mark on a recording medium,
  Recording the record data by irradiating the recording surface of the recording medium with laser light based on the recorded mark length and the recording pulse train determined according to the space length immediately before or after the recorded mark. ,
  Outputting a reproduction RF signal from the recording medium;
  Generating a data extraction clock signal from the reproduced RF signal;
  Detecting a phase error between the reproduction RF signal and the data extraction clock signal for each combination of a mark length and a space length immediately before or after the mark;
  In a recording pulse train determined for each recording medium, asymmetry is obtained from the reproduction RF signal.OrModulation degreeofExtracting information that changes according to the recording power, and determining the recording power so that this information has a predetermined value;
  Determining a light emission waveform rule for the recording medium by adjusting a recording compensation parameter based on the phase error for each combination of a mark length and a space length immediately before or after the mark;
  A step of correcting the recording pulse train based on the determined emission waveform rule.,
  A step of irradiating the recording medium with a desired laser driven by a recording pulse train corrected by the determined recording power;
  Detecting the rotational phase of the mounted recording medium; and
  Phase error data for each combination of mark length and space length before and after the mark is detected by adjusting the phase error according to the target asymmetry for each combination of mark length and space length before and after the mark from the recording power optimization unit A step of performing an offset process according to the target asymmetry based on the rotated phase data, and adjusting a phase error for each rotational phase of the recording medium;Have
[0015]
The information recording system according to the present invention includes the information recording apparatus described above having a light emission waveform rule for recording and a recording power learning function,
A display unit for displaying various information related to the information recording unit;
A remote control unit for inputting a command to the information recording unit;
A controller for controlling the entire system based on a command from the remote control unit;
A receiver that receives broadcasts such as terrestrial broadcasts,
A decoder that converts received broadcasts into information such as audio and video, and
An encoder that converts information such as audio and video into data suitable for recording;
[0016]
According to the present invention, an optimum write strategy (laser emission waveform rule) can be determined for each recording time with a small number of trial writings, and the recording conditions for each recording medium can be further optimized.
In the present invention, the step of detecting the optimum recording power can be omitted by learning the optimization condition of the recording compensation (Write Strategy). In the information recording method according to the present invention, after learning the optimum recording condition between the recording medium and the disk recording / reproducing apparatus, the optimized condition is recorded on the recording medium or the disk recording / reproducing apparatus. Thereafter, the optimum recording condition is restored by reproducing the optimum recording condition. At this time, it can be dealt with by performing only the recording power optimization step for correcting the power decrease due to the lens diaphragm or the like as necessary.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an information recording apparatus, an information recording method, and an information recording system according to the invention will be described with reference to the accompanying drawings.
In each of the following embodiments, an optical information recording / reproducing apparatus that has code data in the DVD-ROM format and records (adds to) a DVD-R medium known as a dye-based recording medium (for example, a dye-based optical disk) is provided. It explains using. In addition, as the data modulation method of the information recording method in the following embodiment, an example in which mark edge recording is performed using an 8-16 modulation code is used. That is, in the following embodiments, information is recorded by forming a recording mark by causing a semiconductor laser to emit light by multi-pulses using the optical disc and recording data.
[0018]
<< First Embodiment >>
The information recording apparatus and information recording method according to the first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a block diagram showing the configuration of the information recording apparatus according to the first embodiment of the present invention.
[0019]
In the information recording apparatus shown in FIG. 1, a semiconductor laser 1 as a laser light source is driven and controlled by a laser driving unit 2, and a laser beam of strong power from the semiconductor laser 1 is collimated lens 3, beam splitter 4, and objective lens 5. The optical disc 6 is condensed and irradiated via Information is recorded on the recording layer of the optical disc 6 irradiated with the laser light with the physical and optical characteristics changed.
On the other hand, at the time of reproduction of the information recording apparatus, a weak power laser beam from the semiconductor laser 1 is condensed and irradiated onto the optical disc 6 through the collimating lens 3, the beam splitter 4 and the objective lens 5. Then, the reflected light from the optical disk 6 is guided to the light receiving element 8 through the detection lens 7 in the beam splitter 4. The light receiving element 8 converts the optical signal into an electric signal and outputs it to the head amplifier 9. The head amplifier 9 converts the electrical signal from the light receiving element 8 into a signal indicating physical information in the optical disc 6. A signal from the head amplifier 9 is input to the data decoder 10 to perform processing such as demodulation and error correction, and data recorded on the optical disc 6 is generated. Here, the semiconductor laser 1, the laser driving unit 2, the collimating lens 3, the beam splitter 4 and the objective lens 5 are used as a recording unit. The detection lens 7, the light receiving element 8, and the head amplifier 9 are used as a reproducing unit.
[0020]
A signal from the head amplifier 9 is input to the phase error detector 11 to detect a phase error from the channel clock for each recording pattern. The recording compensation parameter adjustment unit 12 optimizes the light emission waveform rule based on the detection result in the phase error detection unit 11. The recording pulse train correction unit 13 corrects the control signal to the laser driving unit 2 in accordance with the recording data output from the data encoder 16. The asymmetry detector 14 detects the asymmetry of the signal when the recorded signal is reproduced. The recording power determination unit 15 determines the optimum recording power based on the result of the asymmetry detection unit 14. The data encoder 16 assigns an error correction code to the data to be recorded, performs data modulation, and generates recording data as a drive signal to the basic laser. The controller 17 controls the entire information recording apparatus configured as described above. Here, the asymmetry detection unit 14 and the recording power determination unit 15 constitute a recording power optimization unit, and the recording power optimization unit determines the optimum recording power based on the result in the asymmetry detection unit 14.
As described above, the laser beam driven by the laser driving unit 2 and emitted from the semiconductor laser 1 passes through the collimating lens 3 and the beam splitter 4 and is then condensed on the optical disk 6 by the objective lens 5 to record information. Used for playback or trial writing.
[0021]
In the reproducing operation, the reflected light from the optical disk 6 passes again through the objective lens 5, is separated from the incident light by the beam splitter 4, and forms an image on the light receiving element 8 through the detection lens 7. A detection signal from the light receiving element 8 is converted into an RF signal or the like by the head amplifier 9, converted into a reproduction signal by the data decoder 10, and sent to the controller 17.
In a recording operation for recording data on the optical disc 6, the recording data output from the controller 17 is subjected to data modulation such as addition of an error correction code and 8-16 modulation through the data encoder 16. The signal modulated in this way is converted in the recording pulse train correction unit 13 into a multi-pulse train in which the recording pulse train is corrected according to the mark length of the recording signal and the length of the space immediately before or after the mark, Input to the laser drive unit 2. The laser driving unit 2 is driven and controlled by the controller 17.
[0022]
In the first embodiment, an example in which the recording pulse train is corrected according to the mark length of the recording signal and the length of the space immediately before the mark is shown. However, in the present invention, the recording pulse train is corrected according to the mark length of the recording signal and the length of the space immediately before or after the mark. This also applies to the embodiments described below.
[0023]
In the information recording apparatus of the first embodiment configured as described above, a test pattern for learning the recording power is recorded in order to determine the light emission power (recording power) at the time of recording. Next, the area where the test pattern is recorded is reproduced to measure the relationship between the recording power and the asymmetry. Based on the measurement result of the test pattern, the recording power determination unit 15 determines the optimum recording power that becomes the target asymmetry.
[0024]
Next, a test pattern for determining the light emission waveform rule is recorded. Then, the area in which the test pattern is recorded is reproduced, and the relationship between the prepared emission waveform rule and the phase error amount is examined. That is, the phase error amount in each combination of the lengths of various marks and the lengths of various spaces immediately before the marks is measured. Based on the measured phase error amount, a light emission waveform rule in which the phase error amount is zero is predicted to determine a desired light emission waveform rule.
In the information recording apparatus of the first embodiment, the asymmetry and jitter are three times (3T) to 11 times (11T) and 14 times (14T) the period (T) of the channel clock as the data extraction clock signal. A predetermined pattern (test pattern) composed of a mark and a space having a certain length is trial-written (recorded) with several types of light emission power, and data for each recording power is detected using a reproduction signal of the predetermined pattern.
[0025]
FIG. 2 is a block diagram showing an internal configuration of the asymmetry detection unit 14 in the first embodiment.
As shown in FIG. 2, the asymmetry detection unit 14 of the first embodiment includes an offset cancellation unit 20 for removing the influence of stray light and the like, and the high level (upper peak value of the RF signal from the head amplifier 9). ) And a peak hold unit 21 that detects the light level (peak value) of the long space (14T), and the bottom level (lower bottom value) of the RF signal, and the dark level of the long mark (14T) A bottom hold unit 22 for detecting (bottom value) and a low pass filter (LPF) 23 for holding the average level of the RF signal and detecting the DC level of the continuous short mark are provided. The asymmetry detection unit 14 calculates the average value of the light level and dark level of the long mark, and calculates the difference between the average value and the DC value of the continuous short mark as the difference between the light level and dark level of the long mark. Asymmetry (ASYM) is detected by normalization.
[0026]
The light level of the long space is the maximum value level in the RF signal, and the dark level of the long mark is the minimum value level in the RF signal. The average level of the RF signal is an average value level of the maximum value level and the minimum value level in the RF signal.
[0027]
  Next, asymmetry (ASYM) will be described.
  FIG. 3 is a waveform diagram of the RF signal output from the head amplifier 9 when recording is performed on the optical disc 6 while changing the recording power (three stages). In FIG. 3, (a) is the case where the recording power is low, (c) is the case where the recording power is high, and(B)Indicates a case where the recording power is intermediate between (a) and (c). In FIG. 3, “I14H” indicates the high level of the long space (14T), and “I14L” indicates the bottom level of the long mark (14T). “I3H” indicates the high level of the short mark (3T), and “I3L” indicates the bottom level of the short mark (3T). “I14ave” indicates the average level of the long mark (14T), and “I3ave” indicates the average level of the short mark (3T).
  As shown in FIG. 3A, when the recording power is low, the average level of the short mark (I3ave) exceeds the average level of the long mark (I14ave), and the asymmetry (ASYM) is a negative value. (ASYM <0). Further, as shown in FIG. 3C, when the recording power is high, the average level (I3ave) of the short mark is lower than the average level (I14ave) of the long mark and the long space, and the asymmetry (ASYM) ) Becomes a positive value (ASYM> 0). As described above, when the recording power is increased, the average level (I3ave) of the short mark is relatively lower than the average level (I14ave) of the long mark. Actually, when the recording power is increased, the average level of the long marks gradually decreases, but the average level of the short marks decreases more than that.
[0028]
FIG. 3B shows a state in which the asymmetry (ASYM) is 0, and the average level of the long mark and the long space (I14ave) matches the average level of the short mark and the short space (I3ave). It is.
As described above, in the information recording apparatus of the first embodiment, the asymmetry is calculated by detecting the average level of long marks and long spaces (I14ave) and the average level of short marks and short spaces (I3ave). The recording power is determined.
FIG. 4 is a state diagram showing the level of a reproduction signal when a test pattern is recorded on the optical disc 6 by a plurality of (seven steps) recording powers in the information recording apparatus of the first embodiment. In FIG. 4, the high level (I14H, I3H), the bottom level (I14L, I3L) and the average level (I14ave, when the long mark (14T) pattern and the short mark (3T) pattern are recorded with the respective recording powers. I3ave).
[0029]
In the information recording apparatus of the first embodiment, as shown in FIG. 4, patterns of long marks (14T) and short marks (3T) are alternately recorded with seven levels of recording power. Next, the asymmetry is calculated by detecting the peak value and bottom value of the long mark pattern and the average level of the short mark portion for each pattern recorded with different recording powers. In the first embodiment shown in FIG. 4, the recording is performed with the recording power of seven stages centering on the standard power, and the asymmetry is calculated from the RF signal at the time of reproduction. The method is not limited, and asymmetry may be calculated by detecting marks and spaces in each pattern recorded with a plurality of levels of recording power.
[0030]
FIG. 5 is a graph showing the result of calculation of asymmetry from the RF signal when the pattern recorded with the seven levels of recording power shown in FIG. 4 is reproduced. In FIG. 5, the horizontal axis represents recording power [mW], and the vertical axis represents asymmetry [%] at each recording power. As shown in FIG. 5, the relationship between the recording power and the asymmetry shows a monotonically increasing characteristic near the target asymmetry. When setting the target asymmetry and obtaining the recording power corresponding to the target asymmetry, it is determined by interpolating the measured data by measuring the asymmetry near the target asymmetry at an appropriate recording power interval. Can do.
[0031]
Next, the phase error detector 11 in the information recording apparatus of the first embodiment will be described. FIG. 6 is a block diagram showing the phase error detector 11 in the first embodiment. In the phase error detector 11 shown in FIG. 6, an example using a digital PLL (Digital Phase Lock Loop) is shown. Hereinafter, the configuration of the phase error detector 11 will be described.
As shown in FIG. 6, the signal output from the head amplifier 9 is input to the AGC circuit 30 and the bandpass filter 39 of the phase error detector 11. In the phase error detector 11, the AGC circuit 30 keeps the output amplitude of the RF signal output from the head amplifier 9 constant, and the equalizer 31 improves the frequency characteristics of the output signal from the AGC circuit 30.
[0032]
The output signal from the equalizer 31 is input to the differential amplifier 32, and the differential amplifier 32 subtracts the feedback voltage from the subsequent stage and outputs it to the third A / D converter 33. The third A / D converter 33 converts the potential of the output signal of the differential amplifier 32 into a digital value for each channel clock. The offset control circuit 34 extracts the DC component of the output signal of the third A / D converter 33. The third D / A converter 35 converts the digital output signal of the offset control circuit 34 into an analog voltage.
The differential amplifier 32, the third A / D converter 33, the offset control circuit 34, and the third D / A converter 35 configured as described above constitute an offset control loop 100. In the offset control loop 100, the DC component of the signal input to the third A / D converter 33 is controlled to the midpoint of the conversion level of the third A / D converter 33. The third A / D converter 33 sets the value when the midpoint of the conversion level is digitally converted to 0, outputs a negative value if it is lower than that, and outputs a positive value if it is higher than that. .
[0033]
In the phase error detector 11, the phase comparator 36 generates a phase error signal from the digital signal output of the third A / D converter 33. The first loop filter 37 removes unnecessary high frequency components in the output signal from the phase comparator 36. The first D / A converter 38 converts the digital output signal of the first loop filter 37 into an analog signal. The phase comparator 36, the first loop filter 37, and the first D / A converter 38 described here constitute a phase control circuit 101 for fine adjustment.
Further, as shown in FIG. 6, the radial push-pull signal output from the head amplifier 9 is input to the band pass filter 39. In the band-pass filter 39, unnecessary frequency components in the radial push-pull signal from the preamplifier 9 are removed, and a sine wave (hereinafter referred to as a wobble signal) having a period corresponding to a periodically meandering recording guide groove of the optical disc 6 is obtained. Extract. The binarization circuit 40 binarizes the output signal of the bandpass filter 39, and the low pass filter (LPF) 41 removes chattering of the output signal of the binarization circuit 40.
[0034]
The frequency comparator 42 counts the cycle of the output signal of the low-pass filter 41 with a channel clock described later, compares the count with a reference value, and outputs a frequency error signal. The second loop filter 43 removes unnecessary high frequency components in the output signal of the frequency comparator 42. The second D / A converter 44 converts the digital output signal of the second loop filter 43 into an analog signal. The frequency comparator 42, the second loop filter 43, and the second D / A converter 44 described here constitute a frequency control circuit 102 for coarse adjustment.
The output signal of the first D / A converter 38 and the output signal of the second D / A converter 44 are input to a voltage controlled oscillator (hereinafter abbreviated as VCO) 45. The VCO 45 adds the output voltage of the first D / A converter 38 and the output voltage of the second D / A converter 44 to generate a clock signal having a frequency corresponding to the voltage after the addition. The frequency divider 46 divides the clock signal output from the VCO 45 to a desired frequency. The frequency-divided signal is converted into a system operating frequency in the information recording apparatus and supplied as a channel clock as a data extraction clock signal for the entire system.
[0035]
The pattern detector 47 measures the data length in channel clock units, classifies data pattern data for each pattern of combinations of the length of the space in the recording layer and the length of the mark immediately following the space, and outputs the pattern signal. Output. The phase error detector 48 adds the outputs of the phase comparator 36 for each pattern based on the pattern signal output from the pattern detector 47, adds the outputs for a certain period, and then outputs the average value.
[0036]
The phase comparator 36, pattern detector 47, and phase error detector 48 in the first embodiment will be described more specifically with reference to FIGS.
FIG. 7 is a block diagram showing the configuration of the phase comparator 36, the pattern detector 47 and the phase error detector 48. FIG. 8 is an example of a phase error table used in the first embodiment.
[0037]
In FIG. 7, the delay unit 50 of the phase comparator 36 delays the output value of one channel clock before output from the third A / D converter 33 and inputs it to the phase error detection circuit 51. When a zero-cross signal is input from a zero-cross detection circuit 52, which will be described later, the phase error detection circuit 51 outputs an output closer to 0 out of the output of the third A / D converter 33 and the output before the one-channel clock. Enable voltage. The zero-cross detection circuit 52 detects a change in the sign of the positive / negative sign in the output of the third A / D converter 33 and the output before one channel clock, and outputs the zero-cross signal to the pattern detector 47 together with the phase error detection circuit 51. To do.
The space length detection circuit 53 of the pattern detector 47 uses the pulse length of the section where the output of the third A / D converter 33 is higher than the reference potential as a channel based on the zero cross signal output from the zero cross detection circuit 52. Measure in clock units. The mark length detection circuit 54 measures the pulse length in a section where the output of the third A / D converter 33 is lower than the reference potential in units of channel clocks based on the zero cross signal output from the zero cross detection circuit 52. .
[0038]
The phase error adder 55 in the phase error detector 48 has an individual storage area for each combination of the mark length and the space length immediately before the mark. The phase error adder 55 selects a recording area to be stored based on the output results of the space length detection circuit 53 and the mark length detection circuit 54, and adds the output results of the phase error detection circuit 51 for a certain period.
Similarly, the occurrence frequency detector 56 in the phase error detector 48 has an individual storage area for each combination of the length of the mark and the length of the space immediately before the mark. The occurrence frequency detection unit 56 selects a recording area to be stored based on the output results of the space length detection circuit 53 and the mark length detection circuit 54 and counts for a certain period for each output of the phase error detection circuit 51. The divider 57 extracts and divides the output of the phase error adder 55 and the output of the occurrence frequency detector 56 for each combination of the mark length and the space length immediately before the mark.
[0039]
According to the phase error detection method as described above, the phase error amount can be detected for each combination of the length of the mark and the length of the space immediately before the mark. With such a phase error detection method, the phase error table shown in FIG. 8 is obtained.
FIG. 8 shows a phase error table (a) at the beginning (Leading Edge) of the mark and a phase error table (b) at the end (Trailing Edge) of the mark. In the phase error table of FIG. 8, for example, L3 · 3 indicates the amount of phase error when the mark length is 3T and the space length is 3T immediately before the mark length. Further, for example, T3 · 3 indicates the phase error amount in the case of the end of the mark when the mark length is 3T and the space length is 3T immediately before the mark length. In the phase error table of FIG. 8, the combinations of mark length and space length are all combinations of 3T, 4T, 5T, 6T, 7T, 8T, 9T, 10T, 11T, and 14T. Therefore, a part is omitted in FIG.
[0040]
In the first embodiment, a recording pattern having a phase error is clarified by creating the phase error table shown in FIG. Therefore, according to the information recording apparatus and the information recording method of the first embodiment, it is possible to easily find the recording condition that minimizes the phase error by changing the parameter corresponding to the combination pattern having the phase error. Is possible.
[0041]
Next, phase error detection during recording / reproduction of a specific data pattern will be described.
FIG. 9 shows an example of specific signal waveforms in the recording / reproducing operation. (A) is a recording clock, (b) is recording data for forming a mark and a space, and (c) is a laser. It is a laser drive waveform inputted to the drive unit 2, and (d) shows marks and spaces formed on the recording layer of the optical disc 6. In FIG. 9, (e) is a reproduction waveform of the RF signal when the recording mark of (d) is reproduced, (f) is a binarized output waveform of the reproduction waveform, and (g) is data extraction. A channel clock is shown as a clock signal.
[0042]
As a result of recording and reproducing data, for example, as shown in FIG. 9, at the rising edge (starting edge) of the mark in the data pattern of 3T space-5T mark (L 3. The output of the A / D converter 33 is higher than the reference level. In this case, it can be recognized that the head position of the mark is behind the predetermined position, and it is necessary to change the light emission waveform rule in the direction of expanding the mark. The phase error amount can be obtained by dividing the output of the third A / D converter 33 converted at the timing of the corresponding channel clock by the voltage change rate of the RF signal. That is, by changing the parameter L3 · 5 for adjusting the head position of the mark of the data pattern by an amount corresponding to the phase error amount, the recording compensation parameter L3 · 5Tld having a small phase error can be changed. it can. Here, L3 · 5Tld indicates a recording compensation parameter at the mark start end in the combination of 3T space-5T mark.
By performing the same measurement as described above, creating a phase error table, and performing phase error detection for all data patterns, it is possible to determine a recording condition with a small phase error in any combination of data patterns.
[0043]
Next, the procedure for correcting the recording pulse train in the information recording apparatus of the first embodiment configured as described above will be described with reference to FIGS.
FIG. 10 is a conceptual diagram showing the arrangement of data recorded on the optical disc 6 when determining the light emission waveform rule. In the first embodiment, an example is shown in which one track is roughly divided into four and each is recorded under two recording conditions. The reason for dividing one track into four in this way is to remove the AC component of stress accompanying rotation. The reason for recording under the two recording conditions is to detect the correlation between the output of the third A / D converter 33 and the phase error amount.
[0044]
As shown in FIG. 10, a PLL frequency pull-in area is formed at the head of this track. In order to detect the phase error amount, it is necessary to reproduce the recorded data and apply a PLL to the resulting RF signal. Therefore, some spare area is secured at the beginning of the track for frequency pull-in. Also, in each area of the track, some spare areas are secured for PLL stabilization accompanying the change of the light emission waveform rule.
[0045]
FIG. 11 is a flowchart showing a recording pulse train correction procedure in the information recording apparatus of the first embodiment, and shows a recording compensation parameter learning process.
First, in the information recording apparatus, a light emission waveform rule predetermined for each recording medium to be recorded is set as a first light emission waveform rule (step 101 in FIG. 11). For example, in DVD-R, a light emission waveform rule set by a recording medium manufacturer is written in a prepit formed in a land portion. This emission waveform rule is set as the first emission waveform rule (recording condition 1). However, in the first embodiment, it is possible to appropriately set a light emission waveform rule corresponding to a recording medium to be recorded in the information recording apparatus.
[0046]
Next, in the recording compensation parameter learning process of the first embodiment, the emission waveform rule in which the leading edge of the 3T mark is uniformly shifted forward by a predetermined value is changed to the second emission waveform rule (recording condition 2). Set as. This setting is performed in step 102 of FIG. 11 and is displayed as 3Tdtp = 3Tdtp + 0.05T. Here, 3Tdtp indicates the position of the leading edge of the top waveform (Ttop) in the recording pulse train when a mark having a length three times (3T) the period of the channel clock is formed. That is, in step 102, the position of the leading edge of the top waveform (Ttop) is shifted forward by “0.05T”. In the first embodiment, the light emission waveform rule that uniformly shifts the leading edge of the 3T mark to the front side is selected. However, the processing may be a process of changing a parameter of a part different from the 3T mark.
[0047]
Next, in step 103, the PLL frequency drawing pattern is written in the 0th area under the recording condition 1, as shown in FIG.
Next, in accordance with the arrangement shown in FIG. 10, the track of one rotation is divided into 1/8 areas and a predetermined data pattern is recorded (from step 104 to step 111 in FIG. 11).
[0048]
The first light emission waveform rule (recording condition 1) is applied to the odd-numbered areas 1, 3, 5, and 7 to record the data pattern, and the even-numbered areas 2, 4, 6, and 8 are recorded. The second light emission waveform rule (recording condition 2) is applied to record the data pattern (from step 104 to step 111). The data pattern (recording pattern) recorded in the first embodiment is 3TS-3TM-3TS-4TM-3TS-5TM-3TS-6TM-4TS-3TM-4TS-4TM-4TS-5TM-4TS-6TM- It is a repeating pattern of 144T of 5TS-3TM-5TS-4TM-5TS-5TM-5TS-6TM-6TS-3TM-6TS-4TM-6TS-5TM-6TS-6TM. Here, M indicates a mark, and S indicates a space. That is, “3TS-3TM-3TS-4TM” indicates that recording is performed in the order of 3T space, 3T mark, 3T space, and 4T mark. In the data pattern of the first embodiment, data covering all patterns from 3T to 6T in the combination from the space (S) to the mark (M) was used. The data pattern used here does not include marks and spaces of 7T or more. This is because the phase error amount related to the 7T mark and space can be substituted by the 6T mark and space. In addition, by representing the long mark and the long space as 6T, the data length of the data pattern becomes the shortest, leading to an improvement in SNR (S / N ratio). In addition, since 6T occurs frequently in random data, jitter that occurs during the recording of random data can be generated, and a highly reliable compensation operation is possible.
[0049]
Note that the data pattern in the recording compensation parameter learning process of the first embodiment does not include a synchronization pattern for synchronization. However, if necessary, the data pattern may be configured to perform the synchronization pattern process. Good.
Since the DVD format includes 14T marks and spaces as SYNC (synchronization) patterns, the 14T marks and spaces may be used as learning targets in the recording compensation parameter learning process of the first embodiment.
[0050]
Next, each area from the first area to the eighth area in which the data pattern as the test pattern is recorded is reproduced. The phase error detector 48 (FIGS. 6 and 7) performs an averaging process on a stable region where the PLL is stable, and outputs an average phase error amount (step 112).
In the first region, L3 · 3-1, L3 · 4-1, L3 · 5-1, L3 · 6-1, L4 · 3-1, L4 · 4-1, L4 · 5-1, L4・ 6-1, L5 ・ 3-1, L5 ・ 4-1, L5 ・ 5-1, L5 ・ 6-1, L6 ・ 3-1, L6 ・ 4-1, L6 ・ 5-1, L6 ・ 6 -1, T3-3-1, T3-4-1, T3-5-1, T3-6-1, T4-3-1, T4-4-1, T4-5-1, T4-6-1 , T5-3-1, T5-4-1, T5-5-1, T5-6-1, T6-3-1, T6-4-1, T6-5-1, T6-6-1 In this case, the phase error amount is detected. Here, L3 · 3-1 indicates the phase error amount value (parameter) at the mark start end in the combination of the 3T mark in the first region and the immediately preceding 3T space. T3 · 3-1 indicates the phase error amount at the end of the mark in the combination of the 3T mark in the first region and the immediately preceding 3T space.
[0051]
In the second region, L3 · 3-2, L3 · 4-2, L3 · 5-2, L3 · 6-2, L4 · 3-2, L4 · 4-2, L4 · 5-2. , L4 · 6-2, L5 · 3-2, L5 · 4-2, L5 · 5-2, L5 · 6-2, L6 · 3-2, L6 · 4-2, L6 · 5-2, L6・ 6-2, T3 ・ 3-2, T3 ・ 4-2, T3 ・ 5-2, T3 ・ 6-2, T4 ・ 3‐2, T4 ・ 4-2, T4 ・ 5-2, T4 ・ 6 -2, T5 · 3-2, T5 · 4-2, T5 · 5-2, T5 · 6-2, T6 · 3-2, T6 · 4-2, T6 · 5-2, T6 · 6-2 In each case, the phase error amount is detected. As described above, the phase error amount in each case is similarly detected in the third region and thereafter.
[0052]
In order to remove the influence of the AC component of the stress, the phase error detector 48 has a first area, a third area, a fifth area, and a seventh area recorded by applying the first emission waveform rule. The phase error amount in each case in the odd number region is averaged. Average phase error amounts in this case, L3 · 3-A, L3 · 4-A, L3 · 5-A, L3 · 6-A, L4 · 3-A, L4 · 4-A, L4 · 5-A, L4 · 6-A, L5 · 3-A, L5 · 4-A, L5 · 5-A, L5 · 6-A, L6 · 3-A, L6 · 4-A, L6 · 5-A, L6 · 6-A, T3.3-A, T3.4-A, T3.5-A, T3.6-A, T4.3-A, T4.4-A, T4.5-A, T4.6- A, T5 · 3-A, T5 · 4-A, T5 · 5-A, T5 · 6-A, T6 · 3-A, T6 · 4-A, T6 · 5-A, T6 · 6-A are And obtained by the phase error detector 48 and output.
[0053]
In addition, the phase error amounts in each case in the second area, the fourth area, the sixth area, and the even area of the eighth area recorded by applying the second emission waveform rule are averaged. Average phase error amount in this case, L3 · 3-B, L3 · 4-B, L3 · 5-B, L3 · 6-B, L4 · 3-B, L4 · 4-B, L4 · 5-B, L4 · 6-B, L5 · 3-B, L5 · 4-B, L5 · 5-B, L5 · 6-B, L6 · B, L6 · 4-B, L6 · 5-B, L6 · 6-B, T3 • 3-B, T3 • 4-B, T3 • 5-B, T3 • 6-B, T4 • 3-B, T4 • 4-B, T4 • 5-B, T4 • 6- B, T5 ・ 3-B, T5 ・ 4-B, T5 ・ 5-B, T5 ・ 6-B, T6 ・ 3-B, T6 ・ 4-B, T6 ・ 5-B, T6 ・ 6-B are And obtained by the phase error detector 48 and output.
[0054]
In the first embodiment, the second emission waveform rule is set so that the leading edge of the top waveform (Ttop) of the 3T mark is shifted forward by 0.05T with respect to the first emission waveform rule. ing. Therefore, the difference between the average phase error amount of the odd region calculated as described above and the average phase error amount of the even region, that is, (L33-A)-(L33-B), (L43-A)-(L43- B), (L53-A)-(L53-B), and (L63-A)-(L63-B) represent the amount of change corresponding to 0.05T. Therefore, by comparing the phase error amounts of the regions recorded based on two different emission waveform rules, the difference corresponds to the adjustment step (0.05T in the first embodiment). It is possible to convert the output of the / D converter 33 to the time axis.
[0055]
Therefore, as a result of measuring and comparing the phase error amount when reproducing each area recorded based on the first emission waveform rule and the second emission waveform rule, the average phase exceeding one half of the adjustment step If an error amount has occurred, a light emission waveform rule that minimizes the phase error can be set by changing the corresponding parameter. As described above, the phase error is detected in step 112 in FIG. 11, and the optimum recording compensation value is calculated in step 113. This optimum recording compensation value calculation will be described below with reference to FIG.
[0056]
FIG. 12 is a graph in each pattern showing an example of the relationship between the measured phase error in the data pattern and the recording compensation parameter in the first embodiment. In FIG. 12, ● represents the measured phase error amount when the recording compensation parameter is 0T. Also, the phase error and the recording compensation parameter are substantially proportional, and the diagonal lines (solid line and dotted line) in each graph indicate the relationship between the phase error and the recording compensation parameter in the first embodiment. This inclination is obtained because the phase error amounts of the areas recorded based on two different light emission waveform rules are compared, and the difference represents the change amount equivalent to 0.05T.
In FIG. 12, for example, in the case of L3 · 3 shown in the upper left, the phase error amount is zero. Also, as shown in FIG. 12, the phase error amount was 0 in cases other than L3 · 5. However, in the case of L3 · 5, the leading edge of the 5T mark after 3T space was delayed. Therefore, the recording compensation parameter L3 · 5Tld related to the leading edge of the 5T mark after 3T space is adjusted. The recording compensation parameter L3 · 5Tld to be changed can be calculated by dividing the phase error amount at L3 · 5 by the change amount per 0.05T described above. In the case of L3 · 5 shown in the upper right of FIG. 12, the value of the recording compensation parameter L3 · 5Tld is a value of an intersection (indicated by a circle in the figure) between the dotted line and the phase error zero line. That is, the value of the recording compensation parameter 3 · 5Tld can be obtained by subtracting the value corresponding to the phase error amount to be changed from the value at ± 0.00T (position ●). By using the thus obtained recording compensation parameter L3 · 5Tld, the phase error of the leading edge of the 5T mark after 3T space can be suppressed.
[0057]
As described above, as described in the first embodiment, the recording power is adjusted by asymmetry. Then, in the first embodiment, a data pattern of about one rotation is recorded thereafter, and the recorded area is reproduced, whereby a pattern for each combination of the mark length and the space length immediately before the mark is obtained. The phase error is measured. In the information recording apparatus and the information recording method according to the first embodiment of the present invention, the optimum recording condition is determined by changing the light emission waveform rule based on each phase error measured as described above. It is possible to learn a recording condition for minimizing the phase error at the time.
[0058]
As described above, the information recording apparatus according to the first embodiment of the present invention is an information recording apparatus that uses a mark edge recording system that records information on the leading edge and trailing edge of a mark on a recording medium. And
Recording that records recording data by irradiating the recording surface of the recording medium with laser light based on a recorded pulse length and a recording pulse train determined according to a space length immediately before or after the recorded mark Part 1, 3, 4, 5,
Reproducing units 7, 8, 9 for reproducing information recorded on the recording medium and outputting a reproduction RF signal,
In the recording pulse train determined for each recording medium, information that changes according to recording power such as asymmetry and modulation degree is extracted from the reproduction RF signal, and the recording power is set so that the extracted information becomes a predetermined value. Recording power optimization units 14 and 15 for determining
A phase in which a data extraction clock signal is generated from the reproduction RF signal, and a phase difference between the reproduction RF signal and the data extraction clock signal is detected as a phase error for each combination of a mark length and a space length immediately before or after the mark. Error detector 11,
A recording compensation parameter adjustment unit 12 that determines an optimum light emission waveform rule based on the phase error detected by the phase error detection unit at the recording power determined by the recording power optimization unit; and
And a recording pulse train correction unit 13 that corrects the recording pulse train based on the light emission waveform rule determined by the recording compensation parameter adjustment unit.
[0059]
The information recording method of the first embodiment according to the present invention is an information recording method using a mark edge recording method for recording information on a leading edge and a trailing edge of a mark on a recording medium.
Recording the record data by irradiating the recording surface of the recording medium with laser light based on the recorded mark length and the recording pulse train determined according to the space length immediately before or after the recorded mark. ,
Outputting a reproduction RF signal from the recording medium;
Generating a data extraction clock signal from the reproduced RF signal;
Detecting a phase error between the reproduction RF signal and the data extraction clock signal for each combination of a mark length and a space length immediately before or after the mark;
In the recording pulse train determined for each recording medium, information that changes according to recording power such as asymmetry and modulation degree is extracted from the reproduction RF signal, and the recording power is set so that the extracted information becomes a predetermined value. Step to determine,
Determining a light emission waveform rule for the recording medium by adjusting a recording compensation parameter based on the phase error for each combination of a mark length and a space length immediately before or after the mark;
Correcting the recording pulse train based on the determined emission waveform rule, and irradiating the recording medium with a desired laser driven by the recording pulse train corrected by the determined recording power. is doing.
[0060]
In the information recording apparatus according to the first embodiment of the present invention configured as described above, the optimum recording condition for the optical disk can be determined by changing the light emission waveform rule for each pattern. In the information recording apparatus according to the first embodiment of the present invention, the recording condition for minimizing the phase error amount can be easily learned by recording about one track. The test area of the disk can be used effectively.
[0061]
<< Second Embodiment >>
Next, an information recording apparatus and information recording method according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 13 is a block diagram showing the configuration of the information recording apparatus according to the second embodiment of the present invention.
In the information recording apparatus of the second embodiment shown in FIG. 13, each component is substantially the same as the component shown in the first embodiment. The second embodiment is different from the first embodiment in that a phase error adjustment unit 18 is provided. Therefore, in the second embodiment, components having substantially the same functions and configurations as the components of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0062]
In the information recording apparatus of the second embodiment, a semiconductor laser 1 as a laser light source is driven by a laser driving unit 2, and laser light from the semiconductor laser 1 passes through a collimating lens 3, a beam splitter 4 and an objective lens 5. Then, the optical disc 6 is focused and irradiated. The reflected light from the optical disk 6 is incident on the light receiving element 8 through the detection lens 7. The light receiving element 8 that has converted the optical information into an electrical signal outputs the electrical signal to the head amplifier 9. The head amplifier 9 converts electrical signals from the light receiving element 8 into physical information on the optical disk 6. The data decoder 10 performs processing such as demodulation and error correction on the output signal from the head amplifier 9 to generate recorded data. Here, the semiconductor laser 1, the laser driving unit 2, the collimating lens 3, the beam splitter 4 and the objective lens 5 are used as a recording unit. The detection lens 7, the light receiving element 8, and the head amplifier 9 are used as a reproducing unit.
[0063]
As in the first embodiment, the phase error detector 11 detects a phase error with the channel clock for each recording pattern. The phase error adjustment unit 18 applies an offset to the output of the phase error detection unit 11 according to the target asymmetry. The recording compensation parameter adjustment unit 12 optimizes the light emission waveform rule based on the signal from the phase error adjustment unit 18. The recording pulse train correction unit 13 corrects the control signal to the laser driving unit 2 according to the recording data output from the data encoder 16. The asymmetry detector 14 detects the asymmetry of the RF signal when the recorded signal is reproduced. The recording power determination unit 15 determines the optimum recording power based on the result of the asymmetry detection unit 14. The data encoder 16 assigns an error correction code to the data to be recorded, performs data modulation, and generates a basic laser beam drive signal. The controller 17 controls the entire information recording apparatus of the second embodiment configured as described above.
[0064]
The information recording apparatus of the second embodiment configured as described above is different from the first embodiment in that a phase error adjustment unit 18 is provided, and this phase error adjustment unit 18 detects asymmetry. The detection result of the phase error detection unit 11 is adjusted based on the asymmetry detection result by the unit 14.
When the target asymmetry is high, the potential on the dark level side of the RF signal immediately saturates at a long mark (for example, 6T), and the symmetry of the RF signal is lost. In FIG. 14, (a) shows an example of the waveform of an RF reproduction signal with asymmetry near 0%, and (b) shows an example of the waveform of an RF reproduction signal with asymmetry near 10%. Although the symmetry of the signal in the 3T signal is maintained even when the asymmetry is around 10%, the symmetry of the signal in the long mark (6T) is broken when the asymmetry is increased.
[0065]
In the phase error detection unit 11 in the first embodiment described above, sampling is performed by the third AD converter 33 (FIG. 6) at the timing of the channel clock in the vicinity of the sign change time of the RF signal from the head amplifier 9. . The phase error detection unit 11 measures the phase error amount by averaging the sampling values over a certain period. Since the phase error detection unit 11 in the first embodiment has such a configuration, a phenomenon has occurred in which the detected phase error amount changes depending on asymmetry.
FIG. 15 is a graph showing how the detected phase error amount changes depending on asymmetry. In FIG. 15, (a) shows the frequency distribution of the phase error when the horizontal axis is the phase error and the vertical axis is the frequency of occurrence. (B) shows the phase error amount near 0% asymmetry when the horizontal axis is the phase error and the vertical axis is the phase error * occurrence frequency. (C) is the phase error on the horizontal axis. The vertical axis indicates the phase error amount in the vicinity of 10% asymmetry when the phase error * occurrence frequency is used.
[0066]
As shown in FIG. 15B, when the asymmetry is near 0%, the characteristics of the phase error * occurrence frequency are both symmetric in both the short mark (3T) and long mark (6T) signals. . On the other hand, as shown in FIG. 15 (c), when the asymmetry is around 10%, the characteristics of the phase error * occurrence frequency are symmetric in the short mark (3T) signal, whereas in the long mark (6T) signal, The characteristic of the phase error * occurrence frequency is asymmetric due to the influence of signal saturation. Therefore, the phase error amount obtained from the integration result of the phase error values varies depending on the mark length.
Therefore, in the second embodiment, the phase error adjustment unit 18 is provided at the lower stage of the phase error detection unit 11 so that the target value of the phase error amount of each pattern is individually set according to the asymmetry of the recording data. is doing. As described above, by providing the phase error adjusting unit 18 in the information recording apparatus of the second embodiment, it is possible to correct the deviation of the phase error amount generated when the digital PLL is used. Therefore, the information recording apparatus of the second embodiment can correct the detected phase error amount even when the asymmetry becomes large, and can detect the phase error amount with high accuracy.
[0067]
As described above, the information recording apparatus according to the second embodiment of the present invention is an information recording apparatus using a mark edge recording method for recording information on the leading edge and trailing edge of a mark on a recording medium. ,
Recording that records recording data by irradiating the recording surface of the recording medium with laser light based on a recorded pulse length and a recording pulse train determined according to a space length immediately before or after the recorded mark Part 1, 3, 4, 5,
Reproducing units 7, 8, 9 for reproducing information recorded on the recording medium and outputting a reproduction RF signal,
In the recording pulse train determined for each recording medium, information that changes according to recording power such as asymmetry and modulation degree is extracted from the reproduction RF signal, and the recording power is set so that the extracted information becomes a predetermined value. Recording power optimization units 14 and 15 for determining
A phase in which a data extraction clock signal is generated from the reproduction RF signal, and a phase difference between the reproduction RF signal and the data extraction clock signal is detected as a phase error for each combination of a mark length and a space length immediately before or after the mark. Error detector 11,
A phase error adjusting unit 18 for setting an offset in the output signal from the phase error detecting unit according to the target asymmetry detected by the recording power optimizing unit;
A recording compensation parameter adjusting unit 12 for determining an optimum light emission waveform rule based on the compensated phase error from the phase error adjusting unit at the recording power determined by the recording power optimizing unit; and
And a recording pulse train correction unit 13 that corrects the recording pulse train based on the light emission waveform rule determined by the recording compensation parameter adjustment unit.
[0068]
The information recording method of the second embodiment according to the present invention is an information recording method using a mark edge recording method for recording information on the leading edge and trailing edge of a mark on a recording medium.
Recording the record data by irradiating the recording surface of the recording medium with laser light based on the recorded mark length and the recording pulse train determined according to the space length immediately before or after the recorded mark. ,
Outputting a reproduction RF signal from the recording medium;
Generating a data extraction clock signal from the reproduced RF signal;
Detecting a phase error between the reproduction RF signal and the data extraction clock signal for each combination of a mark length and a space length immediately before or after the mark;
In the recording pulse train determined for each recording medium, information that changes according to recording power such as asymmetry and modulation degree is extracted from the reproduction RF signal, and the recording power is set so that the extracted information becomes a predetermined value. Step to determine,
Determining a light emission waveform rule for the recording medium by adjusting a recording compensation parameter based on the phase error for each combination of a mark length and a space length immediately before or after the mark;
Correcting a recording pulse train based on the determined emission waveform rule;
Irradiating a desired laser to the recording medium driven by a recording pulse train corrected by the determined recording power; and
Adjusting the phase error according to the detected phase error data and asymmetry for each combination of the mark length and the space length immediately before or after the mark.
In the information recording apparatus according to the second embodiment of the present invention configured as described above, the light emission waveform rule is changed for each pattern in consideration of asymmetry, and the optimum recording condition for the optical disc is reliably determined. can do. In the information recording apparatus according to the second embodiment of the present invention, the recording condition for minimizing the phase error amount can be easily learned by recording about one track. The test area of the disk can be used effectively.
[0069]
<< Third Embodiment >>
The information recording apparatus and information recording method according to the third embodiment of the present invention will be described below with reference to FIG.
FIG. 16 is a block diagram showing the configuration of the information recording apparatus according to the third embodiment of the present invention.
In the information recording apparatus of the third embodiment shown in FIG. 16, each component is substantially the same as the component shown in the second embodiment. The third embodiment is different from the second embodiment in that a rotation phase detection unit 19 that detects the rotation state of the optical disk 6 is provided. Therefore, in the third embodiment, components having substantially the same functions and configurations as those of the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed descriptions thereof are provided. Is omitted.
[0070]
In the information recording apparatus of the third embodiment, a semiconductor laser 1 as a laser light source is driven by a laser driving unit 2, and laser light from the semiconductor laser 1 passes through a collimating lens 3, a beam splitter 4 and an objective lens 5. Then, the optical disc 6 is focused and irradiated. The reflected light from the optical disk 6 is incident on the light receiving element 8 through the detection lens 7. The light receiving element 8 that has converted the optical information into an electrical signal outputs the electrical signal to the head amplifier 9. The head amplifier 9 converts electrical signals from the light receiving element 8 into physical information on the optical disk 6. The data decoder 10 performs processing such as demodulation and error correction on the output signal from the head amplifier 9 to generate recorded data. Here, the semiconductor laser 1, the laser driving unit 2, the collimating lens 3, the beam splitter 4 and the objective lens 5 are used as a recording unit. The detection lens 7, the light receiving element 8, and the head amplifier 9 are used as a reproducing unit.
[0071]
As in the first embodiment, the phase error detector 11 detects a phase error with the channel clock for each recording pattern. The rotation phase detection unit 19 detects the rotation phase of the optical disc 6 and outputs the rotation phase signal to the phase error adjustment unit 18. The phase error adjustment unit 18 applies an offset to the output of the phase error detection unit 11 according to the target asymmetry. The recording compensation parameter adjustment unit 12 optimizes the light emission waveform rule based on the signal from the phase error adjustment unit 18. The recording pulse train correction unit 13 corrects the control signal to the laser driving unit 2 according to the recording data output from the data encoder 16. The asymmetry detector 14 detects the asymmetry of the RF signal when the recorded signal is reproduced. The recording power determination unit 15 determines the optimum recording power based on the result of the asymmetry detection unit 14. The data encoder 16 assigns an error correction code to the data to be recorded, performs data modulation, and generates a basic laser beam drive signal. The controller 17 controls the entire information recording apparatus of the third embodiment configured as described above.
[0072]
In the information recording apparatus of the third embodiment configured as described above, the difference from the second embodiment described above is that the phase error adjustment unit 18 has a phase error amount corresponding to the rotational phase of the optical disc 6 in advance. The AC component is measured, the offset of the phase error detection unit is adjusted for each rotation phase of the optical disc 6, and the asymmetry detection unit detects asymmetry for each rotation phase.
The track of the optical disk 6 may be tilted in the tangential direction, that is, tangential tilt may occur due to a mechanical problem in the information recording apparatus or a problem when the optical disk 6 is chucked. When tangential tilt occurs in the optical disc 6 in this way, an offset occurs in the output of the phase error detector 11 during reproduction. In order to remove such a rotational fluctuation component which is an offset in the optical disc 6, in the conventional information recording apparatus, after recording at least one rotation of the disc, all of the recorded one rotation is recorded. A phase error was detected over the time, and a process of averaging the phase error was performed.
[0073]
In the information recording apparatus of the third embodiment, the phase error adjustment unit 18 measures the phase error in the region of the test pattern for detecting the phase error recorded over one rotation of the disk for each rotation phase of the optical disk 6. To do. The asymmetry detector 14 detects the asymmetry of the RF signal for each rotation phase of the optical disc 6. As described above, the information recording apparatus according to the third embodiment is configured to detect the phase error and asymmetry for each rotational phase of the optical disk 6. Thereafter, the offset adjustment of the output signal of the phase error detector 11 is performed for each rotation phase of the optical disc 6 to absorb the measurement error due to the rotation fluctuation caused by tangential tilt or the like. Moreover, since the asymmetry is recognized for each rotation phase, the phase error can be adjusted according to the asymmetry.
[0074]
The conventional information recording apparatus has a configuration in which a test pattern is recorded over at least one rotation of the disc, and the phase error is detected by reproducing the test pattern over one rotation. The information recording apparatus according to the third embodiment is configured to measure the phase error and asymmetry for each rotation phase of the optical disk, and therefore, it is less than one rotation by performing offset adjustment according to the rotation phase. The phase error can be detected correctly even in recording.
In each of the above-described embodiments, the example in which the learning of the first pulse and the subsequent multi-pulse is performed simultaneously has been described. However, the present invention is not limited to such a configuration, and the multi-pulse is not limited. After performing the adjustment, the recording power learning may be performed again, and then the leading pulse may be adjusted.
Further, the information recording apparatus used in the above-described embodiment can be combined with the information reproducing apparatus to constitute the information recording / reproducing apparatus. The information recording / reproducing apparatus configured as described above similarly has the excellent effects described in the above-described embodiments, and determines an optimal write strategy (laser emission waveform rule) for each recording time. Information can be recorded under appropriate recording conditions.
[0075]
As described above, the information recording apparatus according to the present invention is configured to correct and record the recording pulse train according to at least one of the recording speed and the operating temperature. The recording power determination unit in the information recording apparatus determines the recording power so that the asymmetry of the reproduction RF signal becomes a predetermined target asymmetry. The recording power determination unit uses asymmetry set for each type stored in advance by prepits or prewrites on an optical disk as a recording medium as a target asymmetry. The recording power determination unit determines the target asymmetry based on the asymmetry of the prewrite area in which data is recorded in advance. The recording power determination unit determines the recording power so that the modulation degree of the reproduction RF signal becomes a predetermined target modulation degree. The recording power determination unit sets the modulation degree set for each type stored in the recording medium in advance by pre-pits or pre-writes as the target modulation degree. The recording power determination unit determines the target modulation degree based on the modulation degree of the prewrite area in the pre-recorded data. The phase error detector uses the difference between the average of the A / D conversion output at the mark edge and the average of the A / D conversion output at the past mark edge as the phase difference information. The phase error detector sets a phase error offset for each data pattern determined by a combination of the mark length and the space length immediately before the mark according to the target asymmetry. The recording medium used in the present invention records a specific pattern for phase error detection over one or more rotations of the recording surface.
[0076]
The information recording method according to the present invention includes the step of adjusting the recording power and the recording pulse width, and when the recording power and the recording pulse width are adjusted, the learning result of the adjustment is recorded in the area of the recording medium. In addition, when additional recording is performed on the recording medium, the learning result of the previous adjustment is confirmed and recorded. Further, when the third and subsequent recordings are performed on the recording medium, the learning result of the adjustment performed for the first time is used. In the information recording method according to the present invention, at least two recordings with the light emission waveform rule are performed in one rotation of the optical disc, and the correlation between the detection result of the light emission waveform rule and the phase error is calculated from the difference in the reproduction signal. It is configured to take. In the information recording method of the present invention in which light emission is controlled by a combination of the first pulse and the multi-pulse, after learning the recording power, the multi-pulse is learned, the recording power is learned again, and the first pulse is learned. You may comprise so that it may implement. In the information recording method of the present invention, data is recorded by a combination of marks and spaces for three periods (3T) to six periods (6T) of the data extraction clock signal, and the reproduced RF signal of the data and the data extraction clock are recorded. The phase error from the signal is measured for each combination of the mark length and the space length immediately before the mark, and the emission waveform restriction is set.
In the above-described embodiment, the example in which one round of the optical disk is divided into four areas and data is recorded has been described. However, the present invention is not limited to this division number.
[0077]
As above. An information recording apparatus according to a third embodiment of the present invention is an information recording apparatus using a mark edge recording method for recording information on the leading edge and trailing edge of a mark on an optical disk as a recording medium,
A recording unit that records recording data by irradiating the recording surface of the optical disc with laser light based on a recorded pulse length and a recording pulse train determined according to a space length immediately before or after the recorded mark 1,3,4,5,
Reproducing units 7, 8, 9 for reproducing information recorded on the recording medium and outputting a reproduction RF signal,
In the recording pulse train determined for each recording medium, information that changes according to recording power such as asymmetry and modulation degree is extracted from the reproduction RF signal, and the recording power is set so that the extracted information becomes a predetermined value. Recording power optimization units 14 and 15 for determining
A phase in which a data extraction clock signal is generated from the reproduction RF signal, and a phase difference between the reproduction RF signal and the data extraction clock signal is detected as a phase error for each combination of a mark length and a space length immediately before or after the mark. Error detector 11,
A rotational phase detector 19 for measuring a rotational fluctuation component of the phase error detector according to a detected phase error in a recording area for one rotation recorded on the optical disc under the same conditions;
A phase error adjustment unit 18 for setting an offset of the phase error detection unit according to the measured rotational phase;
A recording compensation parameter adjusting unit 12 for determining an optimum light emission waveform rule based on the compensated phase error from the phase error adjusting unit at the recording power determined by the recording power optimizing unit; and
And a recording pulse train correction unit 13 that corrects the recording pulse train based on the light emission waveform rule determined by the recording compensation parameter adjustment unit.
[0078]
The information recording method of the third embodiment according to the present invention is an information recording method using a mark edge recording method for recording information on the leading edge and trailing edge of a mark on a recording medium.
Recording the record data by irradiating the recording surface of the recording medium with laser light based on the recorded mark length and the recording pulse train determined according to the space length immediately before or after the recorded mark. ,
Outputting a reproduction RF signal from the recording medium;
Generating a data extraction clock signal from the reproduced RF signal;
Detecting a phase error between the reproduction RF signal and the data extraction clock signal for each combination of a mark length and a space length immediately before or after the mark;
In the recording pulse train determined for each recording medium, information that changes according to recording power such as asymmetry and modulation degree is extracted from the reproduction RF signal, and the recording power is set so that the extracted information becomes a predetermined value. Step to determine,
Determining a light emission waveform rule for the recording medium by adjusting a recording compensation parameter based on the phase error for each combination of a mark length and a space length immediately before or after the mark;
Correcting a recording pulse train based on the determined emission waveform rule;
A step of irradiating the recording medium with a desired laser driven by a recording pulse train corrected by the determined recording power;
Detecting the rotational phase of the mounted recording medium; and
Adjusting the phase error for each rotational phase of the recording medium based on the detected rotational phase data.
In the information recording apparatus according to the third embodiment of the present invention configured as described above, the light emission waveform rule is changed for each pattern in consideration of the rotational phase of the optical disk, and the optimum recording condition for the optical disk is determined. It can be determined with certainty. In the information recording apparatus according to the third embodiment of the present invention, the recording condition for minimizing the phase error amount can be easily learned by recording about one track, and write-once recording The test area of the disk can be used effectively.
[0079]
In the third embodiment according to the present invention, the step of detecting the optimum recording power can be omitted by learning the optimization condition of the recording compensation (Write Strategy). In that case, in the information recording method according to the present invention, after learning the optimum recording condition between the recording medium and the disk recording / reproducing apparatus, the optimization condition is recorded on the recording medium or the disk recording / reproducing apparatus. Thereafter, the optimum recording condition is restored by reproducing the optimum recording condition. At this time, it can be dealt with by performing only the recording power optimization step for correcting the power decrease due to the lens diaphragm or the like as necessary.
[0080]
<< Fourth Embodiment >>
The information recording system according to the fourth embodiment of the present invention will be described below with reference to FIG.
FIG. 17 is a block diagram showing a configuration of an information recording system according to the fourth embodiment of the present invention. The fourth embodiment of the present invention is an information recording system provided with the information recording apparatus described in the first to third embodiments.
[0081]
In FIG. 17, a display unit 58 is a monitor that displays various types of information related to the information recording unit 64 to the user. The remote control unit 59 is used for a user to input a command to the information recording unit 64. The controller 60 controls the entire information recording system based on a command from the remote control unit 59. The receiving unit 61 receives a broadcast such as a terrestrial broadcast. The decoder 62 converts the received broadcast into information such as audio and video. The encoder 63 converts information such as audio and video into data suitable for recording.
The information recording unit 64 in the fourth embodiment according to the present invention is an information recording apparatus having a function capable of recording on the optical disc described in the first to third embodiments. That is, the information recording unit 64 in the fourth embodiment has a learning function of the light emission waveform rule for recording and the recording power.
[0082]
When a user makes a recording reservation using the remote control unit 59, the recording reservation command is received and interpreted by the controller 60. Then, the controller 60 instructs the information recording unit 64 to perform a learning process for the light emission waveform rule and the recording power. As a result, the information recording unit 64 performs the light emission waveform rule and recording power learning process as described in the first embodiment. After the learning process is completed, the learning result is temporarily held until the start of the reserved program, and the mode is shifted to the standby mode. At this time, if the light emission waveform rule and the recording power cannot be determined, it is determined that the optical disk is abnormal, and a message prompting the user to replace the optical disk is notified by the display unit 58.
Along with the start of the reserved program, for example, a terrestrial broadcast distributed by radio waves is received by the receiving unit 61 and sent to the information recording unit 64 via the decoder 62 and the encoder 63. At this time, the received program data is converted into a desired data format and sent to the information recording unit 64, and the program is recorded using the learning result obtained in the learning process.
[0083]
As above. The information recording system according to the fourth embodiment of the present invention includes an information recording device 64 according to each of the above-described embodiments having a light emission waveform rule for recording and a learning function of recording power.
A display unit 58 for displaying various information related to the information recording unit;
A remote control unit 59 for inputting a command to the information recording unit;
A controller 60 for controlling the entire system based on a command from the remote control unit;
A receiver 61 for receiving a broadcast such as a terrestrial broadcast,
A decoder 62 for converting the received broadcast into information such as audio and video, and
An encoder 63 is provided for converting information such as audio and video into data suitable for recording.
[0084]
As described above, the information recording system of the fourth embodiment is configured to perform a learning process on the optical disc loaded during the reservation operation and notify the user of the learning result. Therefore, if the mounted optical disk is a medium that cannot be recorded, the user can be prompted to replace it. By configuring in this way, it is possible to avoid troubles such as failure to record a program when making a reservation using an optical disk with many disk defects such as defects or an optical disk that is not compatible with the information recording unit. it can.
Note that a learning error in the light emission waveform rule or recording power can be easily dealt with by performing test writing and measuring the reproduction characteristics of the portion.
[0085]
As described above, in the information recording system according to the present invention, the information recording apparatus having the light emission waveform rule for recording and the learning function of the recording power is recorded in the storage device of the recording apparatus that records transient data such as broadcasting. The light emission waveform rule is learned immediately after receiving a data recording instruction (program reservation, etc.). The information recording system of the present invention is configured to perform recording power learning immediately after receiving a data recording command (program reservation or the like). Furthermore, in the information recording system of the present invention, when the learning of the light emission waveform rule or the recording power ends abnormally, the recording commander is notified that a learning error has occurred, and the optical disc is requested to be replaced. It is configured.
[0086]
【The invention's effect】
As described above, the embodiments have the following effects as will be apparent from the detailed description of the embodiments.
In the information recording apparatus, information recording method, and information recording system of the present invention, data is recorded in an area of about one rotation of the optical disk, the recorded area is reproduced, and the length of the mark and immediately before or after the mark are recorded. The phase error is measured for each combination with the space length. Based on the phase error measured in this manner, in the present invention, the optimum recording condition for the optical disc can be determined by changing the emission waveform rule for each pattern. As a result, in the information recording apparatus, information recording method, and information recording system of the present invention, the recording condition that minimizes the phase error amount can be easily learned by recording about one track. The test area of the mold recording disk can be used effectively. As a result, according to the present invention, it is possible to greatly increase the number of times data is additionally written.
According to the present invention, it is possible to correct the target value of each element of the write strategy to be controlled by one recording.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an information recording apparatus according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of an asymmetry detection unit in the first embodiment.
FIG. 3 is a waveform diagram illustrating the relationship between recording power and asymmetry of a reproduction RF signal.
FIG. 4 is a state diagram for explaining the operation at the time of recording power learning.
FIG. 5 is an explanatory diagram for explaining a recording operation at the time of recording power learning.
FIG. 6 is a block diagram showing a configuration of a phase error detection unit in the first embodiment.
FIG. 7 is a block diagram showing a configuration of a phase comparator, a pattern detector, and a phase error detector in the first embodiment.
FIG. 8 is an explanatory diagram of a table showing an output result of the phase error detector in the first embodiment.
FIG. 9 is a waveform diagram showing waveforms of respective parts at the time of phase error adjustment in the first embodiment.
FIG. 10 is a conceptual diagram for explaining a recording operation at the time of phase error adjustment in the first embodiment.
FIG. 11 is a flowchart showing a recording compensation parameter learning process at the time of phase error adjustment in the first embodiment.
FIG. 12 is an explanatory diagram showing an operation of a recording compensation parameter adjustment unit in the first embodiment.
FIG. 13 is a block diagram showing a configuration of an information recording apparatus according to a second embodiment of the present invention.
FIG. 14 is a waveform diagram for explaining RF signals having different asymmetry in the second embodiment.
FIG. 15 is a waveform diagram for explaining a detection error of a phase error detection unit in the second embodiment.
FIG. 16 is a block diagram showing a configuration of an information recording apparatus according to a third embodiment of the present invention.
FIG. 17 is a block diagram showing a configuration of an information recording system according to a fourth embodiment of the present invention.
FIG. 18 is a block diagram showing a configuration of a conventional information recording / reproducing apparatus.
19 is a block diagram showing a configuration of a controller in the information recording / reproducing apparatus of FIG.
FIG. 20 is a waveform diagram showing measured values of asymmetry and jitter in a conventional information recording apparatus.
[Explanation of symbols]
1 Semiconductor laser
2 Laser drive unit
3 Collimating lens
4 Beam splitter
5 Objective lens
6 Optical disc
7 Detection lens
8 Light receiving element
9 Head amplifier
10 Data decoder
11 Phase error detector
12 Recording compensation parameter adjuster
13 Recording pulse train correction unit
14 Asymmetry detector
15 Recording power determination unit
16 Data encoder
17 Controller

Claims (22)

In an information recording apparatus using a mark edge recording method for recording information on a leading edge and a trailing edge of a mark on a recording medium,
Recording that records recording data by irradiating the recording surface of the recording medium with laser light based on a recorded pulse length and a recording pulse train determined according to a space length immediately before or after the recorded mark Part,
A reproduction unit for outputting a reproduction RF signal from the recording medium;
A data extraction clock signal is generated from the reproduction RF signal from the reproduction unit, and a phase difference between the reproduction RF signal and the data extraction clock signal is detected as a phase error for each combination of the mark length and the space length before and after the mark. Phase error detector,
A recording power optimizing unit that extracts information that changes according to the recording power of asymmetry or modulation degree from the reproduction RF signal, and determines the recording power so that the extracted information becomes a predetermined value;
A recording compensation parameter for determining a light emission waveform rule for the recording medium by adjusting a recording compensation parameter based on phase error data detected for each combination of a mark length from the phase error detection unit and a space length before and after the mark Adjustment section,
A recording pulse train correction unit that corrects a recording pulse train based on the light emission waveform rule determined by the recording compensation parameter adjustment unit;
A laser driving unit that is driven by the recording pulse train formed by the recording pulse train correcting unit and irradiates the recording medium with a desired laser according to the recording power determined by the recording power optimization unit;
The phase error data for each combination of the mark length from the phase error detection unit and the space length before and after the mark is determined according to the target asymmetry for each combination of the mark length from the recording power optimization unit and the space length before and after the mark. A phase error adjustment unit for adjusting the phase error, and a rotation phase detection unit for detecting the rotation phase of the mounted recording medium,
The phase error adjustment unit applies an offset to the output of the phase error detection unit according to target asymmetry based on the rotation phase data from the rotation phase detection unit, and outputs the offset to the recording compensation parameter adjustment unit. An information recording apparatus configured to adjust a phase error for each rotational phase of a medium. In an information recording apparatus using a mark edge recording method for recording information on the leading edge and the trailing edge of a mark on an optical disk as a recording medium,
A recording unit that records recording data by irradiating the recording surface of the optical disc with laser light based on a recorded pulse length and a recording pulse train determined according to a space length immediately before or after the recorded mark ,
A reproducing unit for reproducing information recorded on the recording medium and outputting a reproduction RF signal;
In the recording pulse train determined for each recording medium, information that changes according to the recording power of the asymmetry or the modulation degree is extracted from the reproduction RF signal, and the recording power is set so that the extracted information becomes a predetermined value. Recording power optimization unit to be determined,
A phase in which a data extraction clock signal is generated from the reproduction RF signal, and a phase difference between the reproduction RF signal and the data extraction clock signal is detected as a phase error for each combination of a mark length and a space length immediately before or after the mark. Error detector,
A rotational phase that detects the rotational phase of the mounted recording medium and measures the rotational fluctuation component of the phase error detector according to the detected phase error in the recording area for one rotation recorded on the optical disc under the same conditions Detection unit,
A phase error adjustment unit that sets an offset to be applied to the output of the phase error detection unit according to target asymmetry based on the rotation phase data from the rotation phase detection unit, and adjusts a phase error for each rotation phase of the recording medium. ,
A recording compensation parameter adjusting unit for determining an optimum light emission waveform rule based on a phase error for each rotational phase of the recording medium compensated from the phase error adjusting unit at the recording power determined by the recording power optimizing unit; And a recording pulse train correction unit that corrects the recording pulse train based on the light emission waveform rule determined in the recording compensation parameter adjustment unit,
An information recording apparatus comprising:   The information recording apparatus according to claim 2, wherein the phase error adjustment unit is configured to set an offset in the output signal from the phase error detection unit according to the target asymmetry detected by the recording power optimization unit.   The information recording apparatus according to claim 1, wherein the information recording apparatus is configured to correct and record a recording pulse train according to at least one of a recording speed and an operating temperature.   The information recording apparatus according to claim 1, wherein the recording power optimizing unit determines the recording power so that the asymmetry of the reproduction RF signal becomes a predetermined target asymmetry.   The information recording apparatus according to claim 1, wherein the recording power optimization unit uses asymmetry set for each type stored in the recording medium in advance by prepits or prewrites as a target asymmetry.   The information recording apparatus according to claim 1, wherein the recording power optimization unit determines the target asymmetry based on an asymmetry of a prewrite area in which data is recorded in advance.   The information recording apparatus according to claim 1, wherein the recording power optimization unit determines the recording power so that the modulation degree of the reproduction RF signal becomes a predetermined target modulation degree.   The information recording apparatus according to claim 1, wherein the recording power optimization unit sets a modulation degree set for each type stored in the recording medium in advance by prepits or prewrites as a target modulation degree.   The information recording apparatus according to claim 1, wherein the recording power optimization unit determines a target modulation degree based on a modulation degree of a prewrite area in data recorded in advance.   3. The phase error detection unit according to claim 1, wherein the phase error detection unit uses a difference between an average of A / D conversion outputs at a mark edge and an average of A / D conversion outputs at a past mark edge as phase difference information. Information recording device.   The phase error detection unit sets an offset of the phase error for each data pattern determined by a combination of the mark length and the space length immediately before or after the mark according to the target asymmetry. The information recording device described in 1. In an information recording method using a mark edge recording method for recording information on a leading edge and a trailing edge of a mark on a recording medium,
Recording the record data by irradiating the recording surface of the recording medium with laser light based on the recorded mark length and the recording pulse train determined according to the space length immediately before or after the recorded mark. ,
Outputting a reproduction RF signal from the recording medium;
Generating a data extraction clock signal from the reproduced RF signal;
Detecting a phase error between the reproduction RF signal and the data extraction clock signal for each combination of a mark length and a space length immediately before or after the mark;
In the recording pulse train determined for each recording medium, a step of extracting information that changes according to the recording power of asymmetry or modulation degree from the reproduction RF signal, and determining the recording power so that this information becomes a predetermined value. ,
Determining a light emission waveform rule for the recording medium by adjusting a recording compensation parameter based on the phase error for each combination of a mark length and a space length immediately before or after the mark;
Correcting a recording pulse train based on the determined emission waveform rule;
A step of irradiating the recording medium with a desired laser driven by a recording pulse train corrected by the determined recording power;
A step of detecting the rotational phase of the mounted recording medium, and the phase error data for each combination of the mark length and the space length before and after the mark. Adjusting a phase error according to each target asymmetry, performing an offset process according to the target asymmetry based on the detected rotational phase data, and adjusting a phase error for each rotational phase of the recording medium;
An information recording method characterized by comprising:   A step of adjusting the recording power and the recording pulse width. When the recording power and the recording pulse width are adjusted, the learning result of the adjustment is recorded in the area of the recording medium, and the recording medium is additionally recorded. The information recording method according to claim 13, wherein the learning result of the adjustment is confirmed when the adjustment is performed, and the learning result of the first adjustment is used when the recording is performed for the third time or later.   The recording medium is an optical disk, and recording is performed at least twice with the light emission waveform rule in one rotation of the optical disk, and the correlation between the detection result of the light emission waveform rule and the phase error is obtained from the difference in the reproduction signal. Item 14. The information recording method according to Item 13.   In the information recording method in which light emission is controlled by a combination of the first pulse and the multi-pulse, after learning the recording power, the multi-pulse is learned, the recording power is learned again, and then the first pulse is learned. Item 14. The information recording method according to Item 13.   Data is recorded by a combination of marks and spaces for three to six periods of the data extraction clock signal, and the phase difference between the reproduction RF signal of the data and the data extraction clock signal is set immediately before or after the mark length. The information recording method according to claim 13, wherein the measurement is performed for each combination with the space length and the emission waveform restriction is set.   The information recording method according to claim 13, wherein data is recorded by dividing one circumference of an optical disk as a recording medium into four regions. The information recording apparatus according to claim 1, which has a light emission waveform rule for recording and a learning function of recording power,
A display unit for displaying various information related to the information recording unit;
A remote control unit for inputting a command to the information recording unit;
A controller for controlling the entire system based on a command from the remote control unit;
A receiver for receiving a terrestrial broadcast ,
A decoder that converts received broadcasts into audio and video information; an encoder that converts audio and video information into data suitable for recording;
An information recording system comprising: Information using the information recording device according to claim 1 having a light emission waveform rule for recording and a recording power learning function as a storage device of a recording device for recording transient data of broadcasting A recording system,
An information recording system configured to learn light emission waveform rules immediately after receiving a data recording command. An information recording system using the information recording device according to claim 1 having a light emission waveform rule for recording and a recording power learning function as a storage device of a recording device for recording transient data. There,
An information recording system configured to perform recording power learning immediately after receiving a data recording command. An information recording system using the information recording device according to claim 1 having a light emission waveform rule for recording and a recording power learning function as a storage device of a recording device for recording transient data. There,
An information recording system configured to notify a recording commander that a learning error has occurred and to request replacement of an optical disc when abnormally ending in learning of a light emission waveform rule or recording power.

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