JP3532152B2 - Information recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD-R / RW.
The present invention relates to an information recording device such as an optical disc device that records information on a disc-shaped recording medium such as a disc.

[0002]

2. Description of the Related Art For a disk-shaped recording medium having a constant linear density,
For example, CD-R (Compact Disc Reco)
rdable) disc. Such a CD-R disc has a constant linear velocity (CLV: Constant).
It was usual to record while rotating with Linear Velocity. In this case, since the relative speed between the disc-shaped recording medium and the laser beam is always constant, once the recording conditions such as the recording power and the recording pulse width have been optimally determined, it is not necessary to change the entire surface. Therefore, normally, there is no problem in that the test writing is performed by oscillating the power in a specific area of the innermost peripheral portion, and the entire surface is recorded at the same linear velocity by using the optimum recording power determined thereby. However, in the CLV, it is necessary to increase the rotation speed toward the inner peripheral portion, so that it becomes difficult to rotate the CLV at higher speeds. The motor cost increases, noise and vibration increase, and the design of other servo systems becomes difficult.

Therefore, a method is adopted in which the rotation speed is not so much decreased even when going to the outer circumference, instead of increasing the rotation speed so much at the inner circumference. In that case, the linear velocity becomes higher toward the outer circumference. Completely constant rotation speed (CAV: Const
In the case of ant Angular Velocity), the linear velocity increases in proportion to the radius. Also, divide the zone at an appropriate radial position, and set CLV in the zone,
ZCLV (Zone C
There is also a method called LV). Regardless of which method is used, the rotation speed of the inner circumference is not originally increased, so that there are cases in which recording is performed at a linear velocity different from the linear velocity of the inner circumferential area for trial writing. In that case, how to deal with the power and other recording conditions becomes an issue. Therefore, conventionally, in recording at an undesired linear velocity, there has been an information recording device (for example, see Japanese Patent Laid-Open No. 11-296858) that changes the recording power based on a clock frequency proportional to the linear velocity.

[0004]

However, in the conventional information recording apparatus as described above, the recording characteristics of the disc-shaped recording medium (that is, the required recording power and other recording conditions).
However, there is a problem that high-quality recording cannot be performed unless it is completely proportional to the linear velocity. Naturally, there is no such disc-shaped recording medium, and there is also a problem that variations among disc-shaped recording media cannot be avoided. The present invention has been made to solve the above problems, and it is possible to accurately determine the recording power and other recording conditions even at a linear velocity different from that at the time of trial writing, and high quality recording can be performed even at a high speed range. The purpose is to do so.

[0005]

SUMMARY OF THE INVENTION The present invention for achieving the above object, an information recording apparatus for writing information in linear density of a certain circumferential direction of the disk-shaped recording medium, the disc-shaped recording medium Test writing means for performing a trial writing in a predetermined area at a predetermined basic linear velocity, and determining the optimum recording power at the basic linear velocity based on the result of the trial writing, and the basic linear velocity for the disk-shaped recording medium. When recording at a linear velocity different from the above, the linear velocity different from the basic linear velocity based on the optimum recording power at the basic linear velocity
To calculate the recording power when recording with
Therefore Ru Tei and a recording power setting means for setting the obtained recording power.

Further, the trial writing means is provided with an optimum recording state storage means for storing an optimum recording state target value calculated on the basis of a reproduction signal from the disc-shaped recording medium when recording with the optimum recording power, The recording power setting means, the basic linear velocity and
When recording at different linear velocities,
Based on the result of performing a predetermined calculation on the standard
Recording state target value setting means for setting a state target value , and a reproduction signal during recording of information on the disc-shaped recording medium.
The recording state is calculated, by comparing the recorded state <br/> and the recording state target value obtained by the calculation, is provided with a power correction means for correcting the recording power according to the comparison result .

[0007] In the information recording apparatus as described above, the base line according to the type of the disc-shaped recording medium
Of the recording power when recording at a linear velocity different from the velocity
Based on calculation and reproduction signal from the disc-shaped recording medium
Recording status based on the playback signal during calculation and recording of the above information
It is preferable to provide a means for setting an arithmetic expression or a coefficient for calculating the characteristic value . Furthermore , in the information recording device as described above,
Means for determining the type of the disc-shaped recording medium based on the identification code embedded in the disc-shaped recording medium may be provided . Furthermore , in the information recording apparatus as described above, it is preferable to provide means for varying the recording pulse width according to the linear velocity or the type of the disc-shaped recording medium.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an optical disc recording apparatus according to an embodiment of the present invention. FIG. 2 is a diagram showing a list showing speeds, coefficients F1 and F2, and theta for each disc type (Type). FIG. 3 is a diagram for explaining the process of converting the recording data string WDATA into the recording pulse WD1 in the pulse setting unit 11.

FIG. 4 is a diagram showing a list showing β values and B values for each recording power. FIG. 5 is a diagram showing changes in β value and B value for each recording power shown in FIG. FIG. 6 is a list showing an example of type codes and recording parameter numbers for each manufacturer ID. FIG. 7 is a diagram showing the upper envelope and the lower envelope of the low frequency component removed from the reproduction signal RF in the β value detection unit 6. FIG. 8 shows B
FIG. 6 is a diagram for explaining a B value detection process in the value detection unit 7.

As shown in FIG. 1, this optical disk recording apparatus is a CD-R drive or a CD which is realized by a microcomputer including a CPU, a ROM, a RAM and the like.
A recording apparatus such as -RW drive, writing and recording information at a linear density of a certain circumferential direction of the disk-shaped recording medium. This block diagram includes all the constituent features according to claims 1 to 6 of the present invention. Optical disc 20
Is a disc-shaped recording medium such as a CD-R disc or a CD-RW disc, and is rotated by the rotary motor 1.
The rotary motor 1 is rotated at a predetermined speed by the rotation control of the motor controller 2. In this embodiment, the linear velocity is CLV (constant linear velocity), and the linear velocity can be changed by the speed command speed.

The head 3 focuses a light beam on the recording film of the optical disc 20 to form a recording mark. Further, it is movable in the radial direction of the optical disc 20, and it is possible to access a trial writing area and a user data area provided in advance on the optical disc 20. A light source (not shown) is mounted on the head 3. A semiconductor laser light source (LD: Laser Diode) is generally used for this. This LD is modulated by the LD driver 5 into a predetermined recording power state by the input pulse signal WD1. By modulating the LD between the recording power state and the space power state, a recording mark and a non-recording portion can be formed on the recording film of the optical disc 20. When this is reproduced, a difference in reflectance occurs and it can be reproduced as an information signal.

The recording mark is a pit (hole) in an irreversible organic dye medium such as a CD-R disc.
Where it is not, it is called a space. The power setting unit 13 drives the LD driver 5 according to the input recording power command (output signal from the integrating unit 17), and the head 3
Let's light up the LD with that power. When the OPC mode (OPC mode) command is input, the test writing mode is set in which the test writing process is performed regardless of the recording power command, and the recording power is sequentially changed. Recording data data
Is encoded and modulated in a predetermined format by the encoding unit 16, and the recording data string WDATA is formed in a serial format.
Is output as. Also, with the speed command speed,
WDATA is output at a speed according to the recording speed.

The recording data string WDATA is converted into recording pulses by the pulse setting section 11. The conversion process is preferably a process of changing the recording pulse width.
For example, as shown in FIG. 3, a recording pulse W in which the rising edge is shifted to the front side by theta as shown in (b) of FIG.
Perform conversion to change to D1. This theta may be the same amount for all rising edges, but the High width of the recording data string WDATA (that is, the recording mark length)
Different amounts may be set according to For example, High
By setting the theta longer as the width becomes shorter,
In some cases, the recording sensitivity of short marks can be corrected.

The setting of the recording pulse width may be fixed, but it is more preferable to set it according to the linear velocity and the type of optical disc. This is because it is possible to absorb the difference in sensitivity for each recording mark length depending on the linear velocity and the type of optical disc. The identification code indicating the type of the optical disc 20 is detected by the media type detection unit 4 from a reproduction signal when the head 3 reproduces a specific place of the optical disc 20.
This type may be, for example, classified by manufacturer if the optical disk manufacturer can be specified by some method, or even better if the same manufacturer can be further classified.

As another type identification method, for example, identification codes such as various parameters embedded (recorded) in the optical disk 20 in advance can be used. For example, when the recommended power or pulse width is embedded, it may be used. Alternatively, a specific manufacturer identification code may be embedded for each optical disk manufacturer. Further, a code for subclassification may be embedded. By doing so, it is possible to set the optimum recording pulse width according to various recording films of the same manufacturer.

That is, the β value detection unit 6, the optimum power determination storage unit 8, the power setting unit 13 and the like perform trial writing at a predetermined basic linear velocity in a predetermined area of the disk-shaped recording medium, and the test is performed. It functions as a trial writing unit that determines the optimum recording power at the basic linear velocity based on the writing result. The power setting unit 13, the integrating unit 17, etc.,
When recording on a disk-shaped recording medium at a linear velocity different from the basic linear velocity, the function of recording power setting means for setting the recording power based on the result of performing a predetermined calculation on the optimum recording power at the basic linear velocity. Fulfill.

Optimum recording state storage means for storing the optimum recording state target value (beta target) calculated based on the reproduction signal from the disc-shaped recording medium when the optimum power determination storage unit 8 records with the optimum recording power. Fulfill the function of. The optimum power determination storage unit 8 is a disc-shaped record
When recording on a medium at a linear velocity different from the above basic linear velocity
Perform the predetermined calculation for the optimum recording state target value
Based on the result, the recording condition target value is set based on
Performs the function of the mark setting means. The B value detection unit 7, the optimum B value determination storage unit 9, the comparison unit 15, the integration unit 1
7. The power setting unit 13 and the like calculate a recording state based on a reproduction signal during recording of information on the disc-shaped recording medium,
Recording state obtained by the calculation and the above recording state target
It serves as a power correcting means for comparing the value with the value and correcting the recording power according to the comparison result.

The media type detection unit 4, the first conversion table 14, the second conversion table 10, the integration unit 17, etc. are arranged in a basic line according to the type of the disk-shaped recording medium.
Of the recording power when recording at a linear velocity different from the velocity
Calculation and calculation based on the reproduction signal from the disk-shaped recording medium
And the performance of the recording state target value based on the reproduction signal during recording of information.
It fulfills the function of means for setting arithmetic expressions or coefficients.
The media type detection unit 4 and the like serve as a means for discriminating the type of the disc-shaped recording medium based on the identification code embedded in the disc-shaped recording medium. The pulse setting unit 11, the setting table 12 and the like serve as a unit for varying the recording pulse width according to the linear velocity and a unit for varying the recording pulse width according to the linear velocity or the type of the disc-shaped recording medium.

Next, the trial writing process in this optical disk recording apparatus will be described. The trial writing process is a process in which the recording power is sequentially changed and recorded at a certain linear velocity, and then the recorded portion is reproduced to evaluate the recording state and to determine the recording power that provides the optimum recording state. In this optical disc recording device, the power can be changed sequentially for recording by setting the power setting unit 13 in the OPC mode. At this time, a predetermined basic linear velocity is obtained based on the speed (speed) set by the speed setting unit 18. The recording location of the trial writing is generally a PCA area (PCA: Power) on the inner circumference of the optical disc 20 than the user area.
Calibration Area) is used.

After recording in the PCA area, a reproduction signal RF is obtained by reproducing the same position with the light beam emitted from the LD of the head 3. The optimum recording state can be evaluated by measuring and evaluating an appropriate parameter of the reproduction signal RF. For example, the β value detector 6 measures a parameter of β value. The β value detecting unit 6 removes (AC-couples) the low frequency components of the reproduction signal RF, and reproduces the reproduction signal R as shown in FIG.
The upper envelope level a and the lower envelope level b of F are detected.

As a characteristic of the recording film of the optical disk 20, assuming that the reflectance decreases at the recording mark portion and the reproduction signal RF becomes low level at the low reflection portion, the AC-coupled reproduction is performed in an appropriate recording state. The signal RF has vertical symmetry a = b as shown in FIG. Further, when the recording power is excessively large, the recording mark portion becomes long as shown in (b) of the figure. Therefore, when AC-coupled, the upper level becomes high and a> b. Further, when the recording power is insufficient, the recording mark portion becomes short as shown in (c) of the figure, so that when AC-coupled, the lower level becomes high and a <b. The value obtained by normalizing the difference between a and b with the RF amplitude (a + b) is the β value. That is, β = (ab)
/ (A + b). Here, if the β value is large, the power is excessive, and if it is small, the power is insufficient. The optimum recording power is when the β value reaches a certain value (for example, about 4%), and the β value at that time is referred to as “beta target (beta target)”.
et) ". Now, the beta target is about 4% and the recording power is 19mW in steps of 10mW to 1mW.
When the test writing is performed up to, the set of β values with respect to the recording power is reproduced as shown in the list shown in FIG.

FIG. 5 shows the recording powers Pw and β shown in FIG.
It is a diagram which shows the relationship with a value. Recording power Power
A curve in which the β value extends toward the upper right is shown with (Pw) as the horizontal axis. This β curve is the beta target (bet
The optimum recording power is the recording power at the point where it intersects with (a target). The optimum power determination storage unit 8 determines the optimum recording power by the processing as described above. The beta target may be a fixed value (for example, 4%), but it is better to set it according to the type of the optical disc. As described above, the disc type is the media type detection unit 4
The detection result of is used. When the optimum recording power is obtained, the optimum recording power determination storage unit 8 stores the optimum recording power in an internal storage unit, and the power setting unit 13 is used for recording user data.
Set to.

The optimum recording power is the optimum recording power at the linear velocity at which the trial writing was performed. As described in the above problem, in the high-speed optical disk recording device, the linear velocity is increased toward the outer circumference of the optical disk 20. However, the same high linear velocity is applied to the inner PCA.
If you try to get out in the area, the rotation speed becomes too fast, which is not preferable. Therefore, the optimum recording power obtained by performing the trial writing process may be corrected by a certain calculation rule at a linear velocity different from that.

For example, a case will be described where the optimum recording power Pwopt12 is obtained by performing test writing at 12 times the speed of a CD (12x, 1x is 150 Kbyte / sec). 16x speed of another linear speed: 16x, 20x speed: 20x, 24x speed:
Recording power Pwopt16 and recording power Pw at 24x
opt20 and recording power Pwopt24 are respectively Pw
It is determined by a predetermined arithmetic expression that multiplies a predetermined coefficient F1 based on opt12. Recording power at 12 × speed: Pwopt12 = 1.00 ×
Pwopt12 Recording power at 16 × speed: Pwopt16 = 1.10 ×
Pwopt12 20 times speed recording power: Pwopt20 = 1.15 ×
Pwopt12 Recording power at 24 times speed: Pwopt24 = 1.20 ×
Pwopt12 The calculation rule of this calculation formula may be constant multiplication or constant addition as described above, or a more complicated formula as a function of linear velocity. The above predetermined coefficient may be fixed,
It is better to set according to the disc type. As the disc type, the detection result of the media type detection unit 4 is used as described above.

FIG. 2 is a diagram showing an example in which the coefficient F1 described above is tabulated for each disc type (Type). First
The conversion table 14 converts the optimum recording power to that at a desired linear velocity by the conversion processing based on this table. This optimum recording power is input to the integrating means as an initial value of the integrating unit 17. Running OPC (Runn described later)
When the ing OPC) processing is not performed, the on / off command is turned off so that the integration is not performed. In this case, the integrating means is maintained at the initial value. That is, the initial value is directly passed and sent to the power setting unit 13. Therefore, the recording is performed with the optimum recording power obtained from the first conversion table 14.

Next, the running OPC process in this optical disk recording apparatus will be described. The optimum recording power obtained by the trial writing process (and the recording power obtained by converting it according to the speed) is the sensitivity variation in the medium during recording, the sensitivity variation due to the temperature, the recording power variation due to the laser power control error, and the sensitivity due to the wavelength variation. If there are fluctuations, it is not always the optimum state. Therefore, it is necessary to monitor the reproduction signal during recording and detect the recording state of the recording film of the optical disc 20 to correct the power.
It is a PC process.

In the running OPC process, for example, a value obtained by normalizing the level of the reproduction signal during recording with the recording power is set as the B value (recording state target value). This is detected by the B value detector 7. First, the B value is also measured during the trial writing process. After that, when the optimum recording power is obtained by evaluating the β value, the optimum B value determination storage unit 9 stores the B value at the optimum recording power as the target B value (the optimum recording state target value). Then, while recording the user data, the B value is monitored,
The comparison unit 15 compares the target B value. The integrating unit 17 integrates the comparison results and corrects the setting of the recording power for the power setting unit 13. Of course, the on / off command is turned on to perform integration.

If the comparison result is always "0", that is, if the target B value and the detected B value are equal, the integrating unit 17 remains the initial value. That is, the recording is performed with (the converted value of) the optimum recording power. This is when the recording conditions are much better. When the comparison result is not "0", the integrating unit 17 corrects the recording power. If the integrated polarity is set so as to increase the recording power when the comparison result is the power shortage side, the power is constantly corrected so that the recording state becomes good.

In this case, too, the target B value is converted at a linear velocity different from the trial-written linear velocity by a predetermined calculation rule. In this calculation example, the test writing is performed at 12x speed: 12x, and 1
6x speed: 16x, 20x speed: 20x, 24x speed: 24x
12x speed: 12x target B value B12 is used as a reference for constant multiplication. Target B value at 12 times speed: B12 = 1.00 × B12 Target B value at 16 times speed: B16 = 1.10 × B12 Target B value at 20 times speed: B20 = 1.20 × B12 Target at 24 times speed B value: B24 = 1.30 × B12

The calculation rule may be constant multiplication, constant addition, or a more complicated formula as a function of linear velocity. This predetermined coefficient may be fixed, but it is more preferable to set it according to the disc type.
As the disc type, the detection result of the media type detection unit 4 is used as described above. The second conversion table 10 converts the target B value to that at a desired linear velocity by calculation based on the table of the coefficient F2 described above for each disk type (Type) shown in FIG. In this way, the target B value is appropriately calculated and set on the basis of the value of the trial writing linear velocity even if the trial writing and the processing are different linear velocities.

Next, the B value detection process will be described with reference to FIG. The reproduction signal RF during recording becomes a high level by reflecting the laser power as it is at the moment when the laser of the LD starts to emit at the recording power. However, when the recording mark starts to be formed, the reflectance decreases, so that the reflection level gradually decreases. Therefore, when the power is increased, the recording mark formation starts earlier and the reflection becomes lower. Therefore, in order to cancel the influence of the reflection level of the power itself,
It is preferable to divide the reproduction signal RF by the recording power.
The value of RF / power is sampled at an appropriate timing when the recording power is used as the B value. Note that the sampled value does not necessarily have to be used, and for example, an average value may be used. In short, any detection process may be used as long as it can detect a monotonous value with respect to the recording power (particularly in the vicinity of the optimum power) by reflecting the recording mark formation state.

As shown in FIG. 6, recording parameters (Strat) for the manufacturer ID code and the type code of the maker of the optical disk 20 are stored in the media type detecting section 4.
A conversion table to which an "Egy Type" number is assigned is provided, and this recording parameter number is used as a type (Type) in various setting / conversion tables. In the figure, the recording parameter number is the manufacturer ID (A company, B
Company ,. ． ． ． ) Type code (0,
1, 2 ,. ． ． ． No serial number is assigned to each of (1) to (3) in order to reduce the conversion table size by using the same recording parameters for recording films having similar characteristics.

In this way, the optical disk recording apparatus can accurately determine the recording power even at the linear velocity different from the trial writing, and can perform high quality recording even in the high speed range.
Further, the power can be corrected accurately even at the linear velocity different from that of the trial writing, and higher quality recording can be performed even in the high speed range.
Furthermore, the power can be set and corrected more appropriately for various disc-shaped recording media, and higher quality recording can be performed even in the high speed range. In addition, it is possible to more appropriately set and correct the power for various types of disc-shaped recording media of various manufacturers, and it is possible to perform higher quality recording even in the high speed range. Further, the recording pulse width can be accurately set even at a linear velocity different from that of the trial writing, and higher quality recording can be performed even in the high speed range. The recording pulse width can be set more appropriately for various types of media from various manufacturers, and higher quality recording can be performed even in the high speed range.

[0034]

As described above, according to the information recording apparatus of the present invention, the recording power and other recording conditions can be accurately determined even at the linear velocity different from that at the time of trial writing, and high quality recording is possible. Can be performed at high speeds.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc recording apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a list showing speeds, coefficients F1 and F2, and theta for each disc type (Type).

FIG. 3 is a diagram for explaining a process of converting a recording data string WDATA into a recording pulse WD1 in a pulse setting unit 11 shown in FIG.

FIG. 4 is a diagram showing a list showing β values and B values for each recording power.

FIG. 5 is a diagram showing changes in β value and B value for each recording power shown in FIG. 4.

FIG. 6 is a list showing an example of type codes and recording parameter numbers for each manufacturer ID.

7 is a reproduction signal R in the β value detection unit 6 shown in FIG.
FIG. 7 is a diagram showing an upper envelope and a lower envelope of a low frequency component removed from F.

FIG. 8 is a diagram for explaining a B value detection process in a B value detection unit 7 shown in FIG.

[Explanation of symbols]

1: rotary motor 2: motor controller 3: Head 4: Media type detector 5: LD driver 6: β value detector 7: B value detection unit 8: Optimal power determination storage unit 9: Optimal B value determination storage unit 10: Second conversion table 11: Pulse setting section 12: Setting table 13: Power setting unit 14: First conversion table 15: Comparison unit 16: Encoding unit 17: Accumulation section 18: Speed setting section 20: Optical disc

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-11-296858 (JP, A) JP-A-2000-215454 (JP, A) JP-A-9-270128 (JP, A) JP-A-7-57268 (JP, A) JP 2001-344751 (JP, A) JP 2001-216643 (JP, A) JP 10-106009 (JP, A) JP 9-288827 (JP, A) JP 7-6441 (JP, A) JP-A-6-76288 (JP, A) JP-A-4-10237 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 7/00 -7/013 G11B 7/125

Claims (4)

(57) [Claims] 1. An information recording device for writing information in a constant linear density in a circumferential direction of a disk-shaped recording medium, wherein trial writing is performed in a predetermined area of the disk-shaped recording medium at a predetermined basic linear velocity, Test writing means for determining the optimum recording power at the basic linear velocity based on the result of the trial writing, and when recording is performed on the disk-shaped recording medium at a linear velocity different from the basic linear velocity, A recording power setting means for calculating the recording power when recording at a linear velocity different from the basic linear velocity based on the optimum recording power, and setting the recording power obtained by the calculation; Optimal recording state storage means for storing an optimal recording state target value calculated based on a reproduction signal from the disc-shaped recording medium when recording with the optimal recording power is provided. , The recording power setting means, the disk-shaped recording medium
When recording at a linear velocity different from the basic linear velocity,
The result of performing a predetermined calculation on the optimum recording state target value
Set the recording state target value based on the
Compares the constant unit, the recording state is calculated on the basis of the information on the disc-shaped recording medium to the playback signal during recording, and the recording state target value obtained recording state by the operation, according to the comparison result The information recording apparatus is characterized by further comprising power correcting means for correcting the recording power. 2. The information recording apparatus according to claim 1 , wherein the basic linear velocity depends on the type of the disc-shaped recording medium.
Of recording power when recording at a linear velocity different from
And calculation based on a reproduction signal from the disc-shaped recording medium
And a recording state target value based on a reproduction signal during recording of the information
An information recording apparatus comprising means for setting an arithmetic expression or a coefficient for the calculation of. 3. The information recording apparatus according to claim 2 , further comprising means for determining a type of the disc-shaped recording medium based on an identification code embedded in the disc-shaped recording medium. apparatus. 4. The information recording apparatus according to claim 2 or 3 , further comprising means for varying a recording pulse width according to the linear velocity or the type of the disk-shaped recording medium.