JP2003228840A - Information recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when a control targeted value of running- optimum power control is set in recording at high multiple speed by using recording power determined by a target asymmetry method, the control targeted value cannot be set in a region where the size of a recording mark changes with regard to a recording power fluctuation, and running-optimum power control is difficult. <P>SOLUTION: The region where the size of the recording mark changes with regard to the recording power fluctuation can be set as the control targeted value of running-optimum power control by making the rate of change of a modulation degree in recording/reproducing into an index of recording power determination. Therefore, the running-optimum power control is achieved, influence to a margin deterioration by stress is suppressed even in high multiple speed recording, and the recording is stably carried out. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording device for a recording medium having a recording layer.

[0002]

2. Description of the Related Art In recent years, write-once optical disks such as CD-R and rewritable optical disks such as CD-RW have been put to practical use. By reducing the spot diameter with the objective lens 4 and using a thin substrate, DVD-
Large-capacity disks such as R, DVD-RW, and DVD-RAM are entering the stage of practical application. In these optical disk recording / reproducing devices, various technical developments have been carried out in order to enhance and stabilize recording or reproducing performance. One of the technologies is a power control technology for the semiconductor laser 2, and many methods have been proposed. In particular, in a write-once optical disc, data cannot be rewritten, so it is important how to maintain a stable recording state.

In particular, as a method of controlling the laser power during recording, the degree of modulation during recording is detected so that the reflected light from the recording medium is detected during recording and the reflected light amount of the recording mark area of the recording medium becomes a predetermined light amount. OPC (Running-Opt) that controls the laser power by controlling the
A method called “imm Power Control” has been proposed.

For example, as shown in Japanese Patent Application No. 2001-192219, by using a recording waveform of a multi-pulse train having different pulse widths for a mark area, the reflected light A from the recording medium before the mark is formed and the mark are formed. A method of performing control using the reflected light B from the formed region has been proposed. The control target value of the running OPC is obtained from the reflected light of the recording signal under the recording conditions in which the laser power and the laser pulse width are optimally adjusted.

A conventional information recording apparatus having a recording condition adjuster and a running OPC controller will be described below.

FIG. 16 shows a recording condition adjuster and a running OP.
It is a block diagram in the conventional information recording device which has a C controller. In the figure, running OPC is RO
It is described as PC. In FIG. 16, 1 is a laser driver for driving the semiconductor laser 2, 2 is a semiconductor laser as a laser light source, 3 is a beam splitter, 4 is an objective lens, 5 is a recording medium, and 6 is an optical signal converted into an electric signal. Light receiving element, 7 is target asymmetry power setting unit 38
The recording power setter that sets the recording power set in step 1 or the recording power set in the running OPC controller 17 and sets the recording power in the laser driver 1, and 12 is the running OPC that sets the control target value of the running OPC.
A PC control target determination unit, 13 is a recording modulation degree calculator that detects the recording reflected light signal from the light receiving element 6 and calculates the recording modulation degree, and 14 is the recording power determined by the target asymmetry power setting unit 38. A running OPC control target setting device that sets the recording modulation factor from the recording modulation factor calculator 13 as a running OPC control target value, 15
Is a running OPC control unit that optimally adjusts the recording power with respect to recording power fluctuation due to stress during data recording, and 16 is a recording modulation factor that detects a recording reflected light signal from the light receiving element 6 and calculates a recording modulation factor. A calculator, 17 is the recording modulation degree from the recording modulation degree calculator 16 and the running O
Running OPC set by PC control target setter 14
A running OPC controller that controls the recording power during recording by comparing control target values, 36 is a recording power determiner that determines the recording power to be the target asymmetry, and 37 is an asymmetry that detects a reproduction signal from the light receiving element 6. , 38 is an asymmetry calculator, and 38 is an asymmetry calculator 37.
Is a target asymmetry power setting device that compares the output of the target asymmetry with the target asymmetry and sets the recording power that is the target asymmetry.

The operation of the information recording apparatus configured as described above will be described.

The operation until the recording signal is detected by the light receiving element 6 is as follows. First, after the laser light emitted from the semiconductor laser 2 as a laser light source driven by the laser driver 1 passes through the beam splitter 3, The information is recorded on the recording medium 5 by the lens 4, and the information is recorded.
It is used for playback and trial writing. The reflected light from the recording medium 5 passes through the objective lens 4 again, is separated from the incident light by the beam splitter 3, and is imaged on the light receiving element 6. The light receiving element 6 converts the optical signal into an electric signal.

Using this mechanism, the recording power determination unit 36 adjusts the optimum recording power prior to recording data.
In the case of adjusting the recording power, first, test writing is performed with the power being changed stepwise. In the asymmetry calculator 37,
The 3T mark, 3T space, 11T mark, and 11T space signals are detected from the reproduction signal, asymmetry is calculated, and output to the target asymmetry power setting unit 38. The target asymmetry power setter 38 compares the detected asymmetry with the target asymmetry that has been set in advance as a target value, and determines the recording power from the detected asymmetry that becomes the target asymmetry. The determined recording power is set in the recording power setting device 7, and the laser driver 1 controls the semiconductor laser 2.

Next, the control target value of the running OPC is set by using the R-OPC control target determining section. In this method, trial writing is performed by using the recording power determined by the target asymmetry power setting unit 38, and the recording modulation degree calculator 13 detects the recording reflected light at that time and calculates the modulation degree of the recording reflected light. And outputs it to the running OPC control target setter 14. The running OPC control target setting unit 14 stores the modulation degree during recording as a control target value of running OPC.

Data recording is performed by running OPC control.
-OPC control unit 15 is used. While recording data,
The recording sensitivity varies depending on the recording area on the recording surface of the recording medium. The optimum recording power value varies depending on the recording area and recording conditions due to various stresses such as temperature and tilt shift. At the time of data recording, recording is started with the recording power set by the target asymmetry power setting device 38. The reflected light during recording is recorded by the modulation degree calculator 16 during recording.
Detected in. The in-recording modulation degree calculator 16 calculates the in-recording modulation degree from the reflected light during recording. The recording medium side tonality near the control target value has a sufficient rate of change with respect to recording power fluctuations. The situation is shown in FIG. The running OPC controller 17 compares the detected modulation degree during recording and the running OPC control target value, and corrects the recording power so that the detected recording modulation degree becomes the running OPC control target value. The optimum recording power for the medium can be maintained.

By performing the running OPC control, the recording power can be constantly controlled to an optimum state with respect to variations in sensitivity of the recording medium and stresses such as tilt and defocus during recording, and optimum recording conditions are maintained. can do.

[0013]

However, in the high-speed recording, the laser irradiation time to the recording medium is shorter than in the standard speed recording. Therefore, as shown in FIG. It is more difficult to form than a long mark.

The asymmetry is obtained by the ratio of the amplitude center values of the short mark and the short space and the amplitude center value of the long mark and the long space. Therefore, as compared with standard speed recording, in high speed recording, short marks are not formed in a sufficient size in a low power area where recording power is insufficient, so asymmetry is low, and short marks are formed in a high power area. Since a sufficient power can be obtained, the relationship between the recording power and the asymmetry is shown by the solid line in FIG. Also,
The relationship between the recording power and the asymmetry at the standard speed is shown in FIG.
It becomes like the dotted line in (a). Therefore, the high-speed asymmetry has an offset and a steeper slope than the standard speed.

Since the modulation degree during recording is an amplitude change between the long mark and the long space, the slope of the recording side edge to the recording power is almost the same in high speed recording as in standard speed recording. The situation is shown in FIG. Therefore, as compared with the standard speed recording, the relationship between the asymmetry and the modulation degree during recording is different from the standard speed during the high speed recording. Therefore, as shown in FIG. 19, when the control target value of the running OPC is set by using the recording power determined by the target asymmetry method, the control target value of the running OPC is set in an area where a sufficient modulation degree change during recording occurs. Cannot be set. Therefore, there is almost no change in the modulation degree of the recording reflected light which is the control signal of the running OPC with respect to the fluctuation from the optimum recording power during the high-speed recording, and it is very possible to control the running OPC at the high speed. There was a problem that it was difficult.

Therefore, in the present invention, in consideration of the above problem, the recording power is determined in a region of the modulation degree in which the modulation degree during recording sufficiently changes with respect to the recording power fluctuation, and the running OPC is controlled by the recording power. It is an object of the present invention to provide an information recording apparatus capable of running OPC control even at high-speed recording by setting a target value.

[0017]

According to a first aspect of the invention, a recording medium is irradiated with a laser beam which is modulated in accordance with predetermined information and whose light intensity is controlled, and the reflectance of the recording medium varies depending on the intensity of the irradiation light. In an information recording apparatus for recording information by forming changing recording marks, a recording power range in which the reflectance of the recording marks changes as desired by irradiation laser power based on the reflected light from the recording medium before starting data recording. A recording power range selecting means for selecting, and a recording power determining means for determining a recording power within the recording power range selected by the recording power range selecting means,
Running OPC control target setting means for determining a control target value for optimum recording power control during recording from recording reflected light from the recording medium at the recording power determined by the recording power determining means, and recording from the recording medium By comparing the control error signal of the optimum recording power control during recording generated from the reflected light inside and the control target value indicated by the running OPC control target setting means, the proper recording power is obtained.
And a running OPC means for controlling the recording power during the recording operation.

As a result, the recording power can be determined in a region of the modulation degree in which the modulation degree during recording changes sufficiently with respect to the recording power fluctuation. Therefore, the control target value of the running OPC is set by the recording power. By doing so, running OPC control is possible even during high-speed recording.

A second aspect of the invention is to form a recording mark in which the laser light is modulated according to predetermined information and the light intensity is controlled to irradiate the recording medium, and the reflectance of the recording medium changes depending on the intensity of the irradiation light. In the information recording apparatus for recording information by doing so, the recording power range for selecting the recording power range in which the reflectance of the recording mark changes desiredly by the irradiation laser power based on the reflected light from the recording medium before the data recording is started. Selecting means, recording power determining means for determining the recording power within the recording power range selected by the recording power range selecting means, and recording reflected light from the recording medium at the recording power determined by the recording power determining means Running OPC control target setting means for determining a control target value for optimum recording power control during recording,
Trial recording is performed under at least one recording condition, and recording quality adjusting means for adjusting the quality of the recording signal from the reflected light from the recording unit to an optimum condition, and generation from reflected light during recording from the recording medium Running OPC for controlling the recording power during the recording operation so as to obtain an appropriate recording power by comparing the control error signal of the optimum recording power control during recording with the control target value indicated by the running OPC control target setting means. And means.

As a result, even at the time of high-speed recording, it is possible to perform high-quality data recording with a wide jitter margin and a wide power margin, as well as running OPC control.

According to a third aspect of the present invention, a laser beam is modulated according to predetermined information and the light intensity is controlled to irradiate the recording medium, and a recording mark whose reflectance of the recording medium changes depending on the intensity of the irradiated light is formed. In the information recording apparatus for recording information by doing so, the recording power range for selecting the recording power range in which the reflectance of the recording mark changes desiredly by the irradiation laser power based on the reflected light from the recording medium before the data recording is started. Selecting means, recording power determining means for determining the recording power within the recording power range selected by the recording power range selecting means, and recording reflected light from the recording medium at the recording power determined by the recording power determining means Running OPC control target setting means for determining a control target value for optimum recording power control during recording,
Recording quality determination means for determining whether or not recording can be normally performed even under recording conditions in which signal quality is assumed from reflected light from the recording medium at the recording power, and recording conditions in which the signal quality is assumed. If it is determined that the normal recording is possible, the rotational speed is maintained, and if it is determined that the normal recording is difficult under the recording condition where the signal quality is assumed, the rotational speed is changed. A rotation speed adjusting means, and a control error signal for optimum recording power control during recording, which is generated from reflected light during recording from the recording medium,
And a running OPC means for controlling the recording power during the recording operation so that an appropriate recording power is obtained by comparison with the control target value indicated by the running OPC control target setting means.

As a result, it is possible to set the recording speed to the optimum recording condition, to perform the data recording with a wide recording quality such as the jitter bottom and the power margin, and the running OPC.
It can be controlled.

According to a fourth aspect of the present invention, a laser beam is modulated according to predetermined information and the light intensity is controlled to irradiate a recording medium, and a recording mark whose reflectance of the recording medium changes depending on the intensity of the irradiated light is formed. In the information recording apparatus for recording information by doing so, the recording power range for selecting the recording power range in which the reflectance of the recording mark changes desiredly by the irradiation laser power based on the reflected light from the recording medium before the data recording is started. Selecting means, recording power determining means for determining the recording power within the recording power range selected by the recording power range selecting means, and recording reflected light from the recording medium at the recording power determined by the recording power determining means Running OPC control target setting means for determining a control target value for optimum recording power control during recording,
Recording quality determination means for determining whether or not recording can be normally performed even under recording conditions in which signal quality is assumed from reflected light from the recording medium at the recording power, and recording conditions in which the signal quality is assumed. If it is determined that the recording can be performed normally, the control error signal of the optimum recording power control during recording generated from the reflected light during recording from the recording medium and the running OPC control target setting unit indicate A running OP that controls the recording power during the recording operation so that the recording power becomes appropriate by comparison with the control target value.
If it is determined that normal recording is difficult under the recording condition that the C means and the signal quality are assumed, the recording power is set to the optimum recording quality based on the reflected light from the recording medium. And OPC means.

As a result, the running O can be performed at the time of high speed recording.
Even when the PC control cannot be performed, it is possible to determine the recording power with good recording quality at the start of data recording.

According to a fifth aspect of the present invention, a recording mark area in which a laser beam is modulated according to predetermined information and the light intensity is controlled to irradiate the recording medium, and the reflectance of the recording medium changes depending on the intensity of the irradiation light. In an information recording apparatus for recording information by forming, area selecting means for selecting a recording power area in which the reflectance of the recording mark is changed by the irradiation laser power based on the reflected light from the recording medium before the start of data recording, OPC means for determining the recording power in the recording power area selected by the selecting means, and the OPC
Running OPC control target setting means for determining the control target value of the optimum recording power control method during recording from the recording reflected light from the recording medium with the recording power determined by the means, and reflection from the recording medium at the recording power From the light
If it is determined that the signal quality is normally recordable under the recording condition where the signal quality is assumed, the recording quality determination unit that determines whether or not the signal quality can be normally recorded even under the assumed recording condition, A recording operation is performed so that an appropriate recording power is obtained by comparing the control target signal of the optimum recording power control method during recording generated from the recording reflected light from the recording medium and the control target value indicated by the control target setting means. In the case where it is determined that normal recording is difficult under the recording condition where the signal quality is assumed and the running OPC means for controlling the recording power, optimum recording is performed based on the reflected light from the recording medium. O to set the recording power to be a quality
It has a PC means, a sensor for detecting the stress during recording, and a stress recording power control means for controlling the recording power during recording according to the detection result of the sensor.

As a result, even when running OPC control cannot be performed at the time of high-speed recording, it is possible to control the recording power in an optimum state with respect to the stress during data recording.

According to a sixth invention, in any one of the first to fifth inventions, the recording power range selecting means records with at least one recording power and detects the modulation degree from the reproduced or recorded reflected light. However, the recording power is selected so that the modulation degree or the rate of change of the modulation degree becomes a predetermined target value.

A seventh invention is characterized in that, in any one of the first to fifth inventions, the recording power range selecting means selects a recording power at which a modulation degree change rate becomes a maximum value.

In an eighth invention according to any one of the first to fifth inventions, the recording power range selecting means records with at least one recording power, and the asymmetry of the reproduced signal is a predetermined target. The recording power to be asymmetry is temporarily set, and the determination means detects the modulation degree from the reproduction or recording reflected light and determines whether the modulation degree or the rate of change of the modulation degree is within a predetermined target range. If it is within the target range, it is set to the temporarily set recording power, and if it is outside the target range, the degree of modulation of reproduction or recording, or the rate of change of the degree of modulation is within a predetermined target value range. It is characterized in that the recording power is set to be within the range.

In a ninth aspect based on the second aspect, the optimum adjustment condition of the quality of the recording signal is adjusted so that the asymmetry of the reproduced signal becomes a predetermined target asymmetry.

In a tenth aspect based on the second aspect, the optimum condition for adjusting the quality of the recording signal is to detect the phase error of the recording signal from the reproduction signal and adjust the phase error to the minimum. It is characterized by

An eleventh aspect of the invention is the method of the second aspect, wherein the optimum condition for adjusting the quality of the recording signal is to detect the phase error of the recording signal from the reproduction signal, calculate the jitter from the phase error, and calculate the jitter. It is characterized in that it is adjusted so that

A twelfth invention is characterized in that, in the second invention, the optimum adjustment of the quality of the recording signal is adjusting a recording top pulse additional power.

The thirteenth invention is characterized in that, in the second invention, the optimum adjustment of the quality of the recording signal is adjusting a top pulse addition pulse width.

A fourteenth invention is characterized in that, in the second invention, the optimum adjustment of the quality of the recording signal is adjustment of a pulse width.

In a fifteenth aspect based on the fourth aspect, the sensor detects at least one of temperature, detilt, defocus and off-track, and the stress recording power control means is provided. The recording power is controlled for at least one of the following items: temperature, tilt shift, defocus, and off-track.

In a sixteenth aspect of the present invention, in the determination of the rotation speed change of the rotation speed adjuster in the third invention, it is determined whether it is below a target jitter, below a target shift value, or near a target asymmetry. It is characterized in that it is determined using one or more conditions of at least any one of the above.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) In this embodiment, information recording in an optical information recording / reproducing apparatus for recording code data in a DVD-ROM format on a dye-based medium, for example, a dye-based optical disk. An example of the method will be described. Further, as an example of the light emission waveform, when recording the recording data shown in FIG. 2A as the recording data, the laser is emitted by the multi-pulse train composed of the top pulse and the multi-pulse shown in FIG. 2B. Information shall be recorded by controlling.

FIG. 1 is a block diagram of an information recording apparatus according to the first embodiment of the present invention. In FIG. 1, 1 is a laser driver for driving a semiconductor laser 2, 2 is a semiconductor laser as a laser light source, 3 is a beam splitter,
4 is an objective lens, 5 is a recording medium, 6 is a light receiving element for converting an optical signal into an electric signal, and 7 is a recording power set by the target change rate recording power setting device 11 or running OPC.
A recording power setting device for setting the recording power set by the controller 17 and setting the recording power for the laser driver 1.
Is a recording power determination unit that determines the recording power using the rate of change of the modulation degree, 9 is a recording modulation degree calculator that detects the recording reflected light signal from the light receiving element 6 and calculates the recording modulation degree, 10
Is a recording modulation degree change rate calculator for calculating a recording modulation degree change rate from the recording modulation degree output of the recording modulation degree calculator 9,
Reference numeral 11 is a target change rate recording power setting device for setting a recording power at which the change rate during recording modulation ratio from the during-recording modulation rate calculator 10 becomes a target change rate, a target change rate recording power setting device,
Reference numeral 12 is a running OPC control target determination unit that sets a control target value for running OPC, 13 is a recording modulation degree calculator that detects a recording reflected light signal from the light receiving element 6 and calculates a recording modulation degree, and 14 is a target change A running OPC control target setting device that sets the recording modulation factor from the recording modulation factor calculator 13 when recording with the recording power determined by the rate recording power setting device 11, as a running OPC control target value,
Reference numeral 15 is a running OPC control unit that optimally adjusts the recording power against fluctuations in the recording power due to stress during data recording, and 16 is a modulation during recording that detects a recording reflected light signal from the light receiving element 6 and calculates a modulation degree during recording. Degree calculator, 17 is the recording modulation degree from the recording modulation degree calculator 16 and the running OP set by the running OPC control target setting unit 14.
It is a running OPC controller that controls the recording power during recording by comparing C control target values.

The operation of the information recording apparatus configured as described above will be described below. The difference between the present embodiment and the past technology is that the recording power determining unit 8 is used before data recording. This is a method for determining the optimum recording power. Therefore, the operation of calculating the control target value of the running OPC by using the power of the recording power adjustment and performing the running OPC control is the same as the past technique, and therefore the description thereof is omitted, and only the optimum recording power adjustment method will be described. .

In adjusting the optimum recording power, test writing is first performed in which the power is changed stepwise. In the modulation degree detector, the waveform of (c) in FIG. 2 which is the reflected light during recording is observed. In FIG. 2C, A is the maximum level of the reflected light from the recording medium before the mark is formed, and B is the maximum level of the reflected light from the area where the mark is being formed. The in-recording modulation degree detector 13 calculates B / A, which is an index indicating the density of the formed mark, from the reflected light amount A in the unmarked state during recording and the reflected light amount B in the mark formation. . Fig. 3 shows the characteristics of B / A with respect to recording power.
It shows in (a). The modulation degree change rate calculator 10 calculates the change rate with respect to the B / A recording power by using the detected adjacent B / A. FIG. 3B shows the relationship between the recording power and the change rate of B / A.

The output of the modulation degree change rate calculator 10 during recording is input to the target change rate recording power setter 11. With the control target lower limit recording power, the control residual of the running OPC becomes less than the allowable margin as a recorder, and the modulation degree during recording, which is the control target signal of the running OPC control, is sufficient for fluctuations in the recording power. The recording power having the target change rate determined because of the change is determined as the optimum recording power.

FIG. 3 shows a conceptual diagram of the recording power determined by the above method. (1) in FIG. 3 (b) is the target change rate, and (2) in FIG. 3 (b) is the recording power determined in this embodiment. (3) in FIG. 3A is the running OPC control target value determined in this embodiment. (3)
As shown in, the determined control target value is set in a region in which the modulation degree B / A during recording changes sufficiently with respect to the recording power.

The running OPC controller 17 compares the detected modulation degree with the running OPC control target value,
By controlling the recording power so that the modulation degree constantly detected becomes equal to the running OPC control target value,
The optimum recording power for the recording medium can be maintained.

As described above, by using this embodiment, the degree of modulation indicating the reflectance of the recorded mark which is the control target of the running OPC is such that the control residual of the running OPC is less than the allowable margin as a recorder. Since the modulation power with respect to the recording power can determine the recording power in the area having the amount of change required as the control target signal,
Even during high-speed recording, running OPC control can be performed, and it is possible to suppress the influence of margin reduction due to stress such as temperature and tilt, which has a larger influence than the reduction in base jitter due to reduction in target power.

Incidentally, in the present embodiment, the modulation degree B / A during recording is detected to determine the recording power, but in addition to this, the trial writing in which the power is gradually changed in advance is performed,
The same effect can be obtained by reproducing the area and using the modulation factor obtained by dividing the amplitude of the reflected signal by the maximum reflection level.
In this case, the modulation factor B /
Running OPC control is also possible by a method in which a table for converting to A is prepared in the drive, the modulation factor is converted to B / A using this table, and the power is determined using the target change rate of B / A. The recording power can be determined in the area where the B / A changes with respect to the recording power fluctuation, and the running OPC
It can be controlled. This is possible by replacing the recording power determination unit 8 in the configuration diagram of FIG. 1 with 800 of FIG. In FIG. 4, reference numeral 800 is a recording power determination unit that determines the recording power using the rate of change of the modulation degree, 801 is a modulation degree calculator that detects the reproduced reflected light signal from the light receiving element 6 and calculates the modulation degree, and 802 is A modulation degree during recording conversion table for converting the modulation degree detected by the modulation degree calculator 801 into a modulation degree during recording B / A, and 803 is a change in modulation degree during recording from the modulation degree during recording output from the modulation degree during recording conversion table 802. A recording modulation degree change rate calculator 804 for calculating the rate is a target maximum value recording for setting the recording power at which the recording modulation degree change rate from the recording modulation degree change rate calculator 803 becomes the target change rate maximum value. It is a power setting device. In the procedure for determining the recording power by these, first, the test writing is performed in which the power is gradually changed, the modulation degree is detected by the recording modulation degree detector 801, and the recording modulation degree conversion table 802 calculates the modulation degree. Bowl 8
The modulation degree detected at 01 is converted into B / A which is the modulation degree during recording. The recording modulation degree change rate calculator 803 calculates the recording modulation degree change rate of each recording power based on the recording modulation degree. The output of the modulation degree change rate calculator 803 during recording is input to the target change rate recording power setter 804. The target maximum value recording power setting unit 804 compares the preset target change rate maximum value with the detected modulation degree change rate during recording, and determines the recording power from the change rate during recording which is the target change rate maximum value. To decide.

Further, the power determined by the asymmetry method for determining the recording power so as to obtain a predetermined asymmetry for determining the recording power so as to match the formation states of the short mark and the long mark, and the above-mentioned running Which is determined by determining the optimum recording power under that condition from the two recording powers of the recording powers that are determined by using the rate of change of the modulation degree during recording to determine the recording powers that enable OPC control. It is also possible to decide on either side. In that case, it is possible by replacing the recording power determination unit 8 in the configuration diagram of FIG. 1 with 810 of FIG. Figure 5
In 810, a recording power determination unit 810 compares the change rate of the modulation degree with the power determined by asymmetry and selects the one having the optimum recording power, and 9 detects a recording reflected light signal from the light receiving element 6 and is recording. During-recording modulation degree calculator for calculating the degree of modulation, 10 is a recording-time modulation degree change rate calculator for calculating the during-recording modulation degree change rate from the during-recording modulation degree calculator 9, and 11 is during recording. Modulation degree change rate calculator 10
The target change rate recording power setting unit that sets the recording power at which the change rate of the modulation degree during recording becomes the target change rate, 37 is an asymmetry calculator that detects the reproduction signal from the light receiving element 68, and 38 is an asymmetry calculator. Calculator 37
Target asymmetry power setter that compares the output of the target asymmetry with the target asymmetry to set the recording power that becomes the target asymmetry, and 811 is the recording power and the target asymmetry power setter 38 determined by the target change rate recording power setter 11.
This is a judging device that compares the recording powers determined in step 1 to determine the optimum recording power.

The procedure for determining the recording power with this configuration is as follows.
Trial writing is performed in which the power is changed stepwise, the in-recording modulation degree detector 9 detects the in-recording modulation degree, and the in-recording modulation degree change rate calculator 10 determines each recording power based on the in-recording modulation degree. The change rate of the modulation degree during recording is calculated. The output of the modulation degree change rate calculator 10 during recording is input to the target change rate recording power setter 11. The target change rate recording power setting unit 11 compares the preset target change rate with the detected change rate of the modulation degree during recording, and tentatively determines the recording power from the change rate of the modulation degree during recording which is the target change rate. In addition, the test writing area is reproduced, the reproduction signal is detected by the asymmetry calculator 37, and the asymmetry of each recording power is calculated. The output of the asymmetry calculator 37 is input to the target asymmetry power setter 38,
The recording power is provisionally determined to the detected asymmetry that is the same as the β value described on the disc. Target change rate recording power setting device 1
The output of 1 and the output of the target asymmetry power setter 38 are both input to the determiner 811. The discriminator compares the recording power determined so that the modulation rate change rate during recording is the target change rate with the recording power determined from the target asymmetry, and is determined from the target change rate as shown in FIG. If the recording power ≧ the recording power determined by the target asymmetry, and if the recording power determined by the target asymmetry is selected, then the recording power determined from the target change rate <the recording power determined by the target asymmetry as shown in FIG. In the case of, the recording power determined by the target change rate is selected.

In the case of FIG. 6 described above, it is possible to determine the recording power which is the β value described in the disk which is likely to be the recording condition with the high signal quality such as the jitter bottom and the wide power margin, and this power is the fluctuation of the recording power. On the other hand, since the condition that the modulation degree during recording, which is the control target signal of the running OPC control, sufficiently changes, the running OPC control is also possible. Further, in the case of FIG. 7 described later, with the recording power in which the asymmetry is set to the β value described in the disc, the change in the modulation degree during recording is small with respect to the recording power fluctuation, and running OPC control is difficult. Sets the recording power to be the target change rate of B / A so that the running OPC control is prioritized.

Other than this, the effect is the same as long as it can be set as the recording power determining means in a region where the running OPC control signal can be changed with respect to the change of the recording power.
The present invention is not limited to this embodiment.

(Second Embodiment) An information recording apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 8 is a configuration diagram of an information recording apparatus according to the second embodiment of the present invention. In FIG. 8, 1 is a laser driver for driving a semiconductor laser 2, 2 is a semiconductor laser as a laser light source, 3 is a beam splitter, 4 is an objective lens, 5 is a recording medium, and 6 is an optical signal converted into an electric signal. Light receiving element, 7 is target change rate recording MP power setting device 11
The recording power setter for setting the recording power set in step 1 or the recording power set in the running OPC controller 17 to set the recording power in the laser driver 1, and 8 for setting the recording power using the rate of change of the modulation degree. Recording power determining units 8 and 9 for determining detect a recording reflected light signal from the light receiving element 6 and calculate a recording modulation degree, and a recording modulation degree calculator 10 indicates a recording modulation degree from the recording modulation degree calculator 9. A recording medium modulation degree change rate calculator for calculating the recording medium modulation degree change rate, 11
Is a target change rate recording power setting device that sets the recording power at which the modulation degree change ratio during recording from the calculator 10 is a target change rate, and 12 is a running OPC that sets a control target value of the running OPC. Control target determination unit, 13
Is a modulation degree calculator during recording that detects the recording reflected light signal from the light receiving element 6 and calculates the modulation degree during recording, and 14 is the recording when recording is performed with the recording power determined by the target change rate recording power setting device 11. A running OPC control target setting device that sets the recording modulation factor from the medium modulation factor calculator 13 as a running OPC control target value, and 15 is a running that optimally adjusts the recording power against recording power fluctuations due to stress during data recording. An OPC controller, 16 is a recording modulation degree calculator that detects a recording reflected light signal from the light receiving element 6 and calculates a recording modulation degree, and 17 is a recording modulation degree from the recording modulation degree calculator 16 and a running OPC. A running OPC controller that compares the running OPC control target values set by the control target setting device 14 to control the recording power during recording,
Reference numeral 18 is a recording quality adjusting section for adjusting the recording power or pulse width so as to match the formation state of the short mark and the long mark to improve the recording quality, and 19 is the reproduction reflected light signal from the light receiving element 6 to calculate the asymmetry. A target asymmetry recording TP power setting device 20 for setting the recording top pulse additional power at which the asymmetry from the asymmetry calculating device 19 becomes the target asymmetry is set. 21 is a target asymmetry recording TP power setting device 20
It is a recording TP power setting device that sets the recording top pulse additional power set in step 1 and sets the recording top pulse additional power in the laser driver 1.

The operation of the information recording apparatus of the present embodiment configured as above will be described below. Here, the present embodiment differs from the first embodiment in that the recording quality adjusting unit is used to improve the formation state of the short mark and the long mark after setting the recording power and the running OPC control target value. . Also, the laser emission pulse is the first
Unlike the waveform issued by, the recorded data is shown in FIG.
In the case of recording the recording data of, the pulse width uses a multi-pulse train composed of a top pulse and multi-pulses, and the pulse height determines the multi-pulse recording power (multi-pulse power) as shown in FIG. MP power)
And the MP power, the top pulse additional power (T
The emission of the laser is controlled by using (P power).

Also in this embodiment, the initial adjustment method of the recording power (MP power in the present embodiment) is the same as that of the first embodiment, and the power for the recording power initial adjustment is used for running OPC. The operation of calculating the control target value and performing the running OPC control is the same as in the past technology, and thus the description thereof is omitted.

Next, the optimum recording TP in the recording quality adjusting unit
A method of adjusting the optimum recording TP power for adjusting the power and improving the recording state of the short mark will be described. The repetitive signal of 3T mark, 3T space, 11T mark, and 11T space is recorded on the recording medium by using the MP power and the TP power which is changed stepwise, which is determined by the optimum recording MP power adjustment. Only the 3T signal sets the TP power. The reproduction signal is detected by the asymmetry calculator 19. FIG. 10A shows a signal detection result when the TP power is changed. The asymmetry calculator 19 calculates the asymmetry from the average value of the 3T mark and the 3T space, the amplitude of the 11T mark and the 11T space, and outputs the result to the target asymmetry recording TP power setting device 20. FIG. 10B shows changes in asymmetry with respect to TP power. In the target asymmetry recording TP power setting device 20, the β value described in the field ID of the disc is set in advance as the target asymmetry, and the detected asymmetry is compared with the target asymmetry to determine the recording TP power that becomes the target asymmetry. And set in the recording TP power setting device.

Next, the effect of adjusting the formation balance of the short mark and the long mark by the TP power adjustment performed by the recording quality adjusting unit will be described. As already described in the problems to be solved by the invention, in high-speed recording, compared to long marks, the formation of short marks is short in laser irradiation time and heat diffusion time is insufficient. Is difficult to form into a sufficient size. Therefore, the value of asymmetry with respect to the recording power becomes small. However, the slope of the recording medium side dip with respect to the recording power is almost the same. Therefore, compared to standard speed recording, the relationship between asymmetry and the modulation factor during recording is different from standard speed recording during high speed recording, and the control target value of running OPC is determined using the recording power determined by the target asymmetry method. When set, there is a problem in that the control target value of the running OPC cannot be set in a region in which the modulation degree during recording is sufficiently changed. Therefore,
In the information recording apparatus shown in the first embodiment, the recording power is set in an area where the change in the modulation degree during recording can be sufficiently changed with respect to the recording power. However, with the recording power determined by the information recording apparatus shown in the first embodiment, the recording signal may have an asymmetry lower than the β value described in FieldID on the recording medium. But,
Generally, it is known that a recording signal having asymmetry around the β value described in FieldID exhibits excellent characteristics in signal quality such as jitter bottom and power margin. From the viewpoint of recording quality, the recording power is set to the β value. It is desirable to set it near.

Therefore, in the second embodiment, the running O
By changing the forming condition on the long mark side related to the control signal B / A of the PC, the top pulse power is added to the short mark which is difficult to be formed at the time of high-speed recording, and recording is performed with higher recording power. The short mark can be formed to have a sufficient size and the asymmetry can be relatively increased. FIG. 11A shows a mark formation state when there is no top pulse power, and FIG. 11B shows a conceptual diagram of the mark formation effect on the recording medium by the top pulse power adjustment. In the present embodiment, the top pulse power is added to only the 3T signal without adding the top pulse power to all the marks. The reason is that the power is not added to the long mark having sufficient power. Since there is no MP power determination unit 8 and R-OPC
The recording power and the running OPC control target value set so that the modulation degree during recording, which is the control target signal of the running OPC control, changes sufficiently with respect to the recording power fluctuation determined by the control target determining unit 12. The reason is that there is no effect and that the 3T signal has a high signal generation frequency among the short marks and is used for the calculation of asymmetry. FIG. 12 shows the relationship between the degree of modulation during recording and MP power, the asymmetry and MP power, and TP power.

As described above, by using this embodiment, it is possible to set the recording power region in which the modulation degree during recording is sufficiently changed with respect to the recording power fluctuation as the operating range of the running OPC, and the β value Since the optimum asymmetry can be adjusted, even when recording at high speed, it is possible to record data with good recording quality with a wide jitter margin and a wide power margin, and to perform running OPC control, so that the optimum recording power value can be corrected during recording. It is also possible to suppress the influence on the margin reduction due to temperature, servo stress, and the like.

Although the recording quality is adjusted after the running OPC control target value is determined in the present embodiment, it may be adjusted before the target value is determined, and the optimum MP power is determined and the data is recorded. Anytime before the start.

Further, in the present embodiment, as the recording quality adjusting means, the recording top pulse additional power adjustment is performed only for the 3T signal, but the grouping is performed for 3T to 14T (for example, 3T to 5T is performed, but 6T is performed. It is also possible to adjust the recording top pulse added power only for a specific signal (e.g., not perform ~ 14T), and the same effect as this embodiment can be expected. It is also possible to carry out for all signals of 3T to 14T.

Further, in this embodiment, the recording top pulse additional power is adjusted as the recording quality adjusting means, but as shown in FIG. 13A, the width of the top pulse additional pulse is adjusted for recording. It is also possible to make quality adjustments. Further, as shown in FIG. 13B, it is possible to adjust the width of the multi-pulse train and the like, and the short mark that is difficult to be formed at the high speed is adjusted separately from the long mark, and the short mark is adjusted. Various adjustment methods other than the method described in the present embodiment can be used as long as they are adjustment methods for optimally forming the.

In this embodiment, the target asymmetry using the β value described on the disc, which is the recording signal condition recommended by the disc manufacturer, is set as the target recording quality of the recording quality adjusting means to determine the recording condition. In addition to this, the recording conditions that minimize the phase error amount of the signal and the recording conditions that minimize the jitter, such as the recording conditions that minimize the jitter, are set as the target device recording of the recording quality adjusting means. It can be used as a grade.

(Third Embodiment) An information recording apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 14 is a block diagram of an information recording apparatus according to the third embodiment of the present invention. In FIG. 14, 1 is a laser driver for driving the semiconductor laser 24, 2 is a semiconductor laser as a laser light source, 3 is a beam splitter,
4 is an objective lens, 5 is a recording medium, 6 is a light receiving element for converting an optical signal into an electric signal, and 7 is a recording power set by the target change rate recording power setting device 11 or running OPC.
A recording power setting device for setting the recording power set by the controller 17 and setting the recording power for the laser driver 1.
Is a recording power determination unit that determines the recording power using the rate of change of the modulation degree, 9 is a recording modulation degree calculator that detects the recording reflected light signal from the light receiving element 6 and calculates the recording modulation degree, 1
0 is a recording modulation degree change rate calculator for calculating a recording modulation degree change rate from the recording modulation degree from the recording modulation degree calculator 9,
Reference numeral 11 is a target change rate recording power setting device for setting the recording power at which the change rate during recording modulation rate from the change rate calculator for recording 10 becomes a target change rate, and 12 is a running for setting a control target value for running OPC. OPC control target determination unit,
Reference numeral 13 is a recording modulation degree calculator that detects a recording reflected light signal from the light receiving element 6 to calculate a recording modulation degree, and 14 is recording when recording is performed with the recording power determined by the target change rate recording power setting device 11. A running OPC control target setting device that sets the recording modulation factor from the medium modulation factor calculator 13 as a running OPC control target value, and 15 is a running that optimally adjusts the recording power against recording power fluctuations due to stress during data recording. An OPC controller, 16 is a recording modulation degree calculator that detects a recording reflected light signal from the light receiving element 6 and calculates a recording modulation degree, and 17 is a recording modulation degree from the recording modulation degree calculator 16 and a running OPC. A running OPC controller for controlling the recording power during recording by comparing the running OPC control target values set by the control target setting device 14 and 2.
Reference numeral 2 is a recording speed adjusting section for judging the recording quality under the set recording conditions and adjusting the number of rotations of the disc, and 23 is the light receiving element 6
A jitter calculator that detects the reproduced reflected light signal from the device and calculates the jitter, 24 is a recording quality determination device that determines whether the jitter output from the jitter calculator 23 is less than or equal to a preset target jitter value, 25 If the measured jitter is less than the target jitter value as a result of the judgment by the recording quality judgment unit 24, the servo speed controller 26 is instructed to maintain the current number of revolutions to the recording speed adjuster 25 and the measured jitter is measured. Is greater than or equal to the target jitter value, a recording speed adjuster for instructing the servo controller 26 to decrease the number of revolutions for the recording speed adjuster 25, and 26 receives an instruction from the recording speed adjuster 25. The servo controller 27 sets a recording speed for the spindle motor 27, and the spindle motor 27 receives a command from the servo controller 26 to adjust the rotation speed of the recording medium.

The present embodiment differs from the first embodiment in that after setting the recording power and the running OPC control target value, the recording quality is judged by the jitter in the recording speed adjusting section, and the recording speed at which the recording quality can be obtained is obtained. In addition, it has a function of adjusting the rotation speed of the disk. Also in this embodiment, the recording power initial adjustment method is the same as that in the first embodiment, and the operation of performing the running OPC control by calculating the control target value of the running OPC using the power of the recording power initial adjustment Since this is the same as the past technology, the description thereof will be omitted.

In the information recording apparatus shown in the first embodiment, the recording power is set so as to select a region in which the change in the modulation degree during recording can be sufficiently changed with respect to the recording power. However, with the recording power determined by the information recording apparatus shown in the first embodiment, the recording signal may have an asymmetry lower than the β value described in FieldID on the recording medium. However, it is generally known that a recording signal having asymmetry around the β value described in FieldID exhibits excellent characteristics in terms of signal quality such as jitter bottom and power margin. It is desirable to set it around the β value. Therefore, in the present embodiment, after determining the recording conditions that enable the running OPC control, test recording is performed under the determined recording conditions, and it is determined whether the detected jitter is equal to or less than a preset target jitter value. If the target jitter is not reached, the disc rotation speed is reduced, the recording conditions that enable the running OPC control are set again, and the recording is repeated until the target jitter value is satisfied. It is possible to achieve both excellent recording conditions with excellent signal quality and running OPC control for suppressing margin reduction due to stress during recording.

A method of determining the recording quality using the jitter and adjusting the recording speed in the recording speed adjusting unit 22 will be described below. Random pattern trial writing is performed on the disc using the recording power set at the target change rate. Random patterns are 3T-11T, 14T mark, 3T
It is a pattern determined by a combination of ~ 11T and 14T spaces. Next, the trial writing area is reproduced, the jitter calculator 23 calculates the jitter from the reproduced signal, and the output of the jitter calculator 23 is input to the recording quality judging device 24. The recording quality judging unit 24 judges whether the measured jitter in the trial writing area is 9% or less which is the target jitter value, and outputs the result to the recording speed adjusting unit 25. The reason why the target jitter is set to 9% is that the recording signal in consideration of the disc tilt margin, the pickup aberration, the servo margin, etc., in order to achieve a byte error rate of 1 × 10-12, which is acceptable for personal computer use after error correction. It is a value determined from the experimental result regarding the phase error of.

When the input from the recording quality judgment device satisfies the target jitter, the recording speed adjuster 25 instructs the servo controller 26 to maintain the current number of revolutions n and sets the target jitter. If not satisfied, the servo controller 26 is instructed to change the current rotation speed n from the current rotation speed n-1. The servo controller 26 receives an instruction from the recording speed adjuster 25, controls the spindle motor 27 so as to attain the instructed rotation speed, and controls the rotation speed of the disk.
When the recording speed is reduced without satisfying the target jitter, the optimum recording power adjustment and running OP are performed again.
The C control target value is determined, the jitter is determined, and the above control is repeated until recording that satisfies the target jitter.

When the recording power satisfying the target jitter is determined and data recording is performed, running OPC control is performed. The running OPC control is the same as the past technology, and thus detailed description thereof is omitted.

As described above, by adjusting the recording speed by using the present embodiment, the recording power area in which the modulation degree during recording sufficiently changes with respect to the recording power fluctuation is set as the operating range of the running OPC. In addition, since it can be adjusted to the optimum asymmetry that is the β value, it is possible to record data with good recording quality with wide jitter margin and wide power margin, and running OPC control, even during high-speed recording, so optimum recording is possible during recording. Since the power value can be corrected, it is possible to suppress the influence on the margin reduction due to temperature or servo stress.

Although the recording speed adjustment is performed after the running OPC control target value is determined in the present embodiment, it may be performed before the target value is determined, and the optimum recording power is determined and the data recording is started. Anytime before it is done.

Further, in this embodiment, the recording speed adjusting section 22 determines the target jitter value as the judgment of the superiority or inferiority of the recording quality and makes the judgment, and the recording speed is judged according to the result. The recording condition that minimizes the phase error amount of the signal or the recording condition that the parameter indicating the recording quality is the best such as the asymmetry becomes the β value recommended by the disc may be used as the determination index for the recording speed adjustment.

Further, in this embodiment, the recording speed is adjusted by the recording speed adjusting unit 22 from the current rotational speed n to the rotational speed n-1, but it may be n-2 or n-. It may be 3-n or the like and is not particularly defined.

(Fourth Embodiment) An information recording apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 15 is a configuration diagram of the information recording device according to the first embodiment of the present invention. In FIG. 15, 1 is a laser driver for driving the semiconductor laser 2, 2 is a semiconductor laser as a laser light source, 3 is a beam splitter, 4
Is an objective lens, 5 is a recording medium, 6 is a light receiving element for converting an optical signal into an electric signal, and 7 is a recording power set by the target asymmetry power setting device 30 or running OPC.
A recording power setting device for setting the recording power set by the controller 17 and setting the recording power for the laser driver 1.
Is a recording power determining unit that determines the recording power using the rate of change of the modulation degree, and 9 is a recording degree modulation degree calculator that detects the recording reflected light signal from the light receiving element 6 and calculates the recording degree of modulation,
Reference numeral 10 is a recording modulation degree change rate calculator for calculating the recording modulation degree change rate from the recording modulation degree from the recording modulation degree calculator 9, and 11 is a recording modulation from the recording modulation degree change rate calculator 10. Target change rate recording power setting device for setting the recording power at which the change rate becomes the target change rate, 12 is a running OPC
, A running OPC control target determining section for setting a control target value of the recording medium, a reference numeral 13 for a recording modulation degree calculator for detecting a recording reflected light signal from the light receiving element 6 and calculating a recording degree of modulation, and a target change rate recording power setting. A running OPC control target setting device that sets the recording modulation factor from the recording modulation factor calculator 13 when recording with the recording power determined by the device 11 as a running OPC control target value, and 15 is due to stress during data recording. A running OPC control unit for optimally adjusting the recording power with respect to the fluctuation of the recording power, and 16 for the light receiving element 6
The recording modulation degree calculator for detecting the recording reflected light signal from the recording medium and calculating the recording modulation degree, 17 is the recording modulation degree from the recording modulation degree calculator 16 and the running OPC control target setting device 1
4. A running OPC controller that controls the recording power during recording by comparing the running OPC control target values set in 4, a recording power determination unit 28 that determines the recording power to reach the target asymmetry, and 29 a light receiving element An asymmetry calculator that detects the reproduced signal from 6 and calculates asymmetry, and 30 compares the output of the asymmetry calculator 29 with a preset target asymmetry to set the recording power that becomes the target asymmetry and record the determined power value. A target asymmetry power setting device that outputs the power to the power adjuster, 31 is a recording power adjusting unit that optimally adjusts the recording power with respect to a change in the recording power due to stress during data recording.
2 is a temperature sensor for detecting the temperature of the semiconductor laser 2, 3
Reference numeral 3 is a recording power adjusting section for optimally adjusting the power during recording according to a power correction algorithm for temperature stress which is predetermined according to the output of the temperature sensor 32, and 34 is a recording quality by calculating the jitter of the recording signal from the reproduction signal. A recording quality determination device that determines whether or not the margin is less than a preset target jitter that can be secured and switches the switching device 35 according to the result, 35 is an input to the recording power setting device 7 by the recording quality determination device and the recording power is adjusted. This is a switching device for switching between the operation from the unit 33 and the operation from the running OPC controller 17.

The operation of the information recording apparatus configured as described above will be described below.
What is different from the embodiment of the present invention is that the recording quality is judged by the recording quality judging device by the jitter after setting the recording power and the running OPC control target value, and the running OPC control is performed, or the running OPC control is stopped and the jitter bottom appears. That is, it has a function of resetting the recording condition so as to obtain a high recording quality and selecting whether to perform recording. Also in this embodiment, the recording power initial adjustment method is the same as that in the first embodiment, and the operation of performing the running OPC control by calculating the control target value of the running OPC using the power of the recording power initial adjustment Since this is the same as the past technology, the description thereof will be omitted.

In the information recording apparatus shown in the first embodiment, the recording power is set so as to select the area in which the change in the modulation degree during recording can be sufficiently changed with respect to the recording power. However, with the recording power determined by the information recording apparatus shown in the first embodiment, the recording signal may have an asymmetry lower than the β value described in FieldID on the recording medium. However, it is generally known that a recording signal having asymmetry around the β value described in FieldID exhibits excellent characteristics in terms of signal quality such as jitter bottom and power margin. It is desirable to set it around the β value. Therefore, in the present embodiment, after determining the recording condition, the jitter is detected, it is judged whether the jitter is equal to or less than a preset target jitter, and if the target jitter is reached, the running OPC control is directly performed. Record data. If the target jitter is not reached, adjust the recording power of the conventional target asymmetry control, set the recording conditions with excellent signal quality such as the jitter bottom near the β value recommended by the disk and wide power margin, and set the stress such as temperature. Is detected by a sensor, and recording is performed using a recording power adjuster that optimally adjusts the recording power with respect to the detected stress. As a result, it is possible to adjust to the optimum asymmetry that gives the β value without slowing down the recording speed. Therefore, even at high-speed recording, it is possible to perform high-quality data recording with a wide jitter margin and a wide power margin, and running OPC control or recording. Since the optimum recording power value can be corrected during recording by the power adjuster, it is possible to suppress the influence of margin decrease due to temperature, servo stress, or the like.

The method for determining the recording quality by the jitter, the recording power adjustment method for the target asymmetry control, and the operation of the recording power adjuster for detecting the stress with the sensor and adjusting the power during recording with respect to the stress will be described below. To do. Test writing is performed on the disc using the recording power set by the target change rate recording power setting unit 11, and the recording quality determination unit 34 calculates the jitter from the reproduced signal, and the target jitter is 9% or less for which a margin can be secured as the recording quality. Is determined. When the jitter of the detection signal is 9% or less, the recording quality determination unit issues a command to the switching unit 35 to connect the running OPC control unit 17 and the recording power setting unit 7, and the switching unit 35 runs. The controller 17 and the recording power setting device 7 are connected. After that, when recording data, the running OPC controller 17 is used to adjust the optimum power during recording. Jitter of detection signal is 9
If it is more than%, the recording quality judgment device issues a command to the switching unit 35 to connect the recording power adjusting unit 33 and the recording power setting unit 7, and the switching unit 35 causes the recording power adjusting unit 33 and the recording power to be connected. Connect the setting device 7. After that, the recording power is again determined by the target asymmetry method using the recording power setting unit 2, and when recording data, the recording power adjuster 33 is used to adjust the optimum power during recording.

Since the recording power determining operation performed by using the recording power determining unit 31 is the same as the adjustment of the optimum recording power of the past technology, detailed description thereof will be omitted, and the outline of the optimum recording power adjustment method will be described below. explain. In the case of adjusting the recording power, first, test writing is performed with the power being changed stepwise. The asymmetry calculator 29 detects 3T mark, 3T space, 11T mark, and 11T space signals from the reproduced signal, calculates asymmetry, and outputs it to the target asymmetry power setting device 30. In the target asymmetry power setting device 30, the detected asymmetry is compared with the target asymmetry that has been set in advance as a target value, and from the detected asymmetry that becomes the target asymmetry,
Determine the recording power. The determined recording power value is stored in the recording power adjuster.

Next, a method of adjusting the recording power when recording data will be described. During the recording of data, the temperature of the element of the semiconductor laser 2 changes due to the change of the outside air temperature and the heat generated by the light emission of the semiconductor laser 2 itself. Temperature sensor 3
At 2, the temperature of the two semiconductor laser elements during recording is detected and input to the recording power adjuster. In the recording power adjuster, a table is prepared in advance as to how much the emission power is changed according to the variation of the laser emission wavelength due to the temperature change of the two semiconductor lasers, and the recording power determined by the target asymmetry power setting device 30 On the other hand, based on the temperature information of the two semiconductor laser elements from the temperature sensor 32, the recording power for temperature is adjusted.

As in the present embodiment, after setting the running OPC target value with which the modulation degree during recording can be sufficiently changed, it is confirmed whether or not the low jitter can be sufficiently secured by the recording power, and the desired jitter value is obtained. If it satisfies, the running OPC control is performed at the time of signal recording, and if the desired jitter value is not satisfied, the recording power is determined by the target asymmetry method, the stress is detected by the sensor, and the correction amount for the stress is prepared in advance. It is possible to adjust the power with respect to the stress during recording with high quality without lowering the specified recording speed by adjusting the table.

In this embodiment, the target jitter value is set as the determination of the superiority or inferiority of the recording quality, and the recording speed is determined according to the determination result. The recording condition that minimizes the recording condition, or the recording condition that gives the best parameter indicating the recording quality such as the asymmetry becomes the β value recommended by the disc may be used as the determination index for the recording speed adjustment.

Further, in the present embodiment, the temperature is detected, but in addition to this, other stresses such as tilt shift, defocus, and off-track are detected. Then, the recording power may be controlled.

The method of adjusting the recording power for these stresses can be stored in advance in the firmware or the like in the drive, or can be stored in the EEPROM or the like and the result of the process adjustment can be reflected. Is.

[0082]

As described above, according to the information recording apparatus of the present invention, the recording power can be determined in the area of the modulation degree in which the modulation degree during recording is sufficiently changed with respect to the recording power fluctuation. By setting the control target value of the running OPC with the recording power, the running OPC control can be performed even at the high speed recording.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an information recording device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of recording pulses.

FIG. 3 is an explanatory diagram of a method of determining a recording power and a running OPC control target value.

FIG. 4 is a configuration diagram of another implementation method according to the first embodiment of the present invention.

FIG. 5 is a configuration diagram of another implementation method according to the first embodiment of the present invention.

FIG. 6 is an explanatory view of a recording power determination means part 1 using asymmetry and a change rate of B / A.

FIG. 7 is an explanatory diagram of a recording power determination means part 2 using asymmetry and a rate of change of B / A.

FIG. 8 is a configuration diagram of an information recording device according to a second embodiment of the present invention.

FIG. 9 is an explanatory diagram of a recording pulse according to the second embodiment of the invention.

FIG. 10 is an explanatory diagram of a relationship between top pulse power and asymmetry.

FIG. 11 is an explanatory diagram of the effect of top pulse power.

FIG. 12 is an explanatory diagram of the relationship between the recording power, the asymmetry, and the recording modulation degree with and without the top pulse power during high-speed recording.

FIG. 13 is an explanatory diagram of pulse width adjustment.

FIG. 14 is a configuration diagram of an information recording device according to a third embodiment of the present invention.

FIG. 15 is a configuration diagram of an information recording device according to a fourth embodiment of the present invention.

FIG. 16 is a block diagram of a conventional information recording device.

FIG. 17 is an explanatory diagram of the relationship between the recording power and the asymmetry and the recording modulation degree at the standard speed recording.

FIG. 18 is an explanatory diagram of a recording speed and a recording mark formation state for explaining the problems of the conventional example.

FIG. 19 is an explanatory diagram of the relationship between the recording power and asymmetry and the recording modulation degree at the time of high-speed recording for explaining the problems of the conventional example.

[Explanation of symbols]

1 laser driver 2 Semiconductor laser 3 beam splitter 4 Objective lens 5 recording media 6 Light receiving element 7 Recording power setting device 8 Recording power determination unit 9 Modulation degree calculator during recording 10 Modulation rate change rate calculator during recording 11 Target change rate recording power setting device 12 Running OPC control target determination unit 13 Modulation degree calculator during recording 14 Running OPC control target setter 15 Running OPC controller 16 Modulation factor calculator during recording 17 Running OPC Controller 18 Recording quality adjustment section 19 Asymmetry calculator 20 Target asymmetry recording TP power setting device 21 Recording TP power setting device 22 Recording speed adjustment unit 23 Jitter calculator 24 Record quality judgment device 25 Recording speed adjuster 26 Servo Controller 27 Spindle motor 28 Recording power determiner 2 29 Asymmetry calculator 30 Target asymmetry power setting device 31 recording power adjustment unit 32 Temperature sensor 33 Recording power adjustment unit 34 Record quality judgment device 35 switch 36 Recording power determiner 37 Asymmetry calculator 38 Target asymmetry power setting device 800 Recording power determination unit 801 Modulation degree detector 802 Recording Modulation Degree Conversion Table 803 Modulation rate change rate calculator during recording 804 Target change rate recording power setting device 810 Recording power determination unit 811 Judgment device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kai             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Takumi Matsuura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5D090 AA01 BB03 CC01 CC18 DD03                       EE03 JJ12 KK04 KK05                 5D119 AA23 BA01 BB02 DA01 HA47                       HA60                 5D789 AA23 BA01 BB02 DA01 HA47                       HA60

Claims (16)

[Claims] 1. Information is obtained by modulating laser light according to predetermined information and irradiating the recording medium with controlling the light intensity, and forming a recording mark whose reflectance of the recording medium changes depending on the intensity of the irradiation light. In the information recording apparatus for recording, a recording power range selecting means for selecting a recording power range in which the reflectance of the recording mark makes a desired change by the irradiation laser power based on the reflected light from the recording medium before starting the data recording, A recording power determining means for determining a recording power within the recording power range selected by the recording power range selecting means; and an optimum recording operation from recording reflected light from the recording medium at the recording power determined by the recording power determining means. Running OPC control target setting means for determining a control target value for recording power control, and a counter for recording during recording from the recording medium. The recording power is controlled during the recording operation so that an appropriate recording power is obtained by comparing the control error signal of the optimum recording power control during recording generated from the emitted light with the control target value indicated by the running OPC control target setting means. An information recording apparatus, comprising: 2. Information is obtained by modulating laser light according to predetermined information and irradiating the recording medium with controlling the light intensity, and forming a recording mark whose reflectance of the recording medium changes depending on the intensity of the irradiation light. In the information recording apparatus for recording, a recording power range selecting means for selecting a recording power range in which the reflectance of the recording mark makes a desired change by the irradiation laser power based on the reflected light from the recording medium before starting the data recording, A recording power determining means for determining a recording power within the recording power range selected by the recording power range selecting means; and an optimum recording operation from recording reflected light from the recording medium at the recording power determined by the recording power determining means. Running OPC control target setting means for determining a control target value for recording power control, and at least one or more recording conditions Recording quality adjusting means for adjusting the quality of the recording signal from the reflected light from the recording section to an optimum condition, and the optimum recording during recording generated from the reflected light during recording from the recording medium. A running OPC means for controlling the recording power during the recording operation so that an appropriate recording power is obtained by comparing the control error signal of the power control with the control target value indicated by the running OPC control target setting means. Information recording device. 3. Information is obtained by modulating a laser beam according to predetermined information and irradiating the recording medium with controlling the light intensity, and forming a recording mark whose reflectance of the recording medium changes depending on the intensity of the irradiation light. In the information recording apparatus for recording, a recording power range selecting means for selecting a recording power range in which the reflectance of the recording mark makes a desired change by the irradiation laser power based on the reflected light from the recording medium before starting the data recording, A recording power determining means for determining a recording power within the recording power range selected by the recording power range selecting means; and an optimum recording operation from recording reflected light from the recording medium at the recording power determined by the recording power determining means. Running OPC control target setting means for determining a control target value for recording power control; Recording quality determination means for determining whether or not recording can be normally performed even under recording conditions in which signal quality is assumed from reflected light from the recording medium, and normal recording can be performed under recording conditions in which the signal quality is assumed. If it is determined that there is maintained the number of revolutions,
When it is determined that normal recording is difficult under the recording condition in which the signal quality is assumed, it is generated from rotation speed adjusting means for changing the rotation speed, and reflected light during recording from the recording medium. Running OPC means for controlling the recording power during the recording operation so that the recording power becomes appropriate by comparing the control error signal of the optimum recording power control during recording with the control target value indicated by the running OPC control target setting means. An information recording device comprising: 4. Information is obtained by modulating a laser beam according to predetermined information and irradiating the recording medium with controlling the light intensity, and forming a recording mark whose reflectance changes depending on the intensity of the irradiation light. In the information recording apparatus for recording, a recording power range selecting means for selecting a recording power range in which the reflectance of the recording mark makes a desired change by the irradiation laser power based on the reflected light from the recording medium before starting the data recording, A recording power determining means for determining a recording power within the recording power range selected by the recording power range selecting means; and an optimum recording operation from recording reflected light from the recording medium at the recording power determined by the recording power determining means. Running OPC control target setting means for determining a control target value for recording power control; Recording quality determination means for determining whether or not recording can be normally performed even under recording conditions in which signal quality is assumed from reflected light from the recording medium, and normal recording can be performed under recording conditions in which the signal quality is assumed. If it is determined that there is a comparison, a control error signal for optimum recording power control during recording, which is generated from reflected light during recording from the recording medium, is compared with a control target value indicated by the running OPC control target setting means. By the running OPC means for controlling the recording power during the recording operation so that the recording power becomes appropriate, and when it is determined that the normal recording is difficult under the recording condition where the signal quality is assumed, the recording is performed. An information recording apparatus comprising: an OPC unit that sets a recording power that provides optimum recording quality based on light reflected from the medium. 5. A recording mark area in which the reflectance of the recording medium changes depending on the intensity of the irradiation light by modulating the laser light according to predetermined information and controlling the light intensity to form a recording mark area. In an information recording apparatus for recording information, area selection means for selecting a recording power area in which the reflectance of a recording mark is changed by irradiation laser power based on reflected light from the recording medium before starting data recording, and the selection means OPC means for determining the recording power in the selected recording power area, and running OPC for determining the control target value of the optimum recording power control method during recording from the recording reflected light from the recording medium with the recording power determined by the OPC means. Control target setting means and recording conditions in which signal quality is assumed from reflected light from the recording medium at the recording power However, if it is determined that the recording quality is determined normally, it is possible to perform normal recording under the recording conditions in which the signal quality is assumed, and from the recording reflected light from the recording medium. In order to obtain an appropriate recording power by comparing the generated control target signal of the optimum recording power control method during recording with the control target value indicated by the control target setting means,
A running OPC means for controlling the recording power during the recording operation, and when it is determined that normal recording is difficult under the recording condition in which the signal quality is assumed, it is determined based on the reflected light from the recording medium. OPC means for setting the recording power to achieve a high recording quality, a sensor for detecting the stress during recording, and a recording power control means for stress for controlling the recording power during recording according to the detection result of the sensor. An information recording device characterized by. 6. The recording power range selecting means records with at least one recording power, detects a modulation degree from reproduction or recording reflected light, and a modulation degree or a change rate of the modulation degree is predetermined. 6. The information recording apparatus according to claim 1, wherein the recording power having the target value is selected. 7. The information recording apparatus according to claim 1, wherein the recording power range selection means selects a recording power with which the modulation degree change rate has a maximum value. 8. The recording power range selection means records at least one or more recording powers, and the reproduction signal asymmetry is temporarily set to a recording power at which a predetermined target asymmetry is obtained. Alternatively, the degree of modulation is detected from the recording reflected light, and it is determined whether the degree of modulation or the rate of change of the degree of modulation is within a predetermined target range. If the recording power is outside the target range, the recording power is set so that the reproduction or recording modulation degree or the rate of change of the modulation degree falls within a predetermined target value range. The information recording device according to claim 1. 9. The conditions for optimum adjustment of the quality of the recording signal are:
The asymmetry of the reproduction signal is adjusted so as to be a predetermined target asymmetry.
The information recording device described in. 10. The condition for the optimum adjustment of the quality of the recording signal is to detect a phase error of the recording signal from the reproduction signal and adjust so that the phase error is minimized. Information recording device. 11. The optimum condition for adjusting the quality of the recording signal is to detect the phase error of the recording signal from the reproduction signal, calculate the jitter from the phase error, and adjust to minimize the jitter. The information recording apparatus according to claim 2, which is characterized in that. 12. The information recording apparatus according to claim 2, wherein the optimum adjustment of the quality of the recording signal is to adjust the recording top pulse additional power. 13. The information recording apparatus according to claim 2, wherein the optimum adjustment of the quality of the recording signal is to adjust a pulse width of a top pulse. 14. The information recording apparatus according to claim 2, wherein the optimum adjustment of the quality of the recording signal is adjusting a pulse width. 15. The sensor detects at least one of temperature, detilt, defocus, and off-track, and the stress recording power control means controls temperature, tilt shift, defocus, and off. The information recording apparatus according to claim 5, wherein the recording power is controlled for at least one of the tracks. 16. At least one of the determinations as to whether or not the rotational speed of the rotational speed adjuster is to be changed is below a target jitter, below a target shift value, or near a target asymmetry. The information recording apparatus according to claim 3, wherein the information recording apparatus is determined using the above conditions.