JP2003109221A - Optical disk unit and method for controlling data recording irradiation power - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk unit which can properly adjust data recording irradiation power, and to provide a method for controlling the data recording irradiation power. SOLUTION: In the method for controlling the data recording irradiation power, first data are recorded on an optical disk, the first data is reproduced to detect the dead end of the first data, and second data are recorded from a position following the dead end. Predetermined information is recorded on the coordination area of the optical disk by changing recording power stepwise. The predetermined information is reproduced to determine first recording power. A reflected light quantity when recording the predetermined information by the first recording power is detected. The first data are recorded on a regions other than the coordination area by the first recording power to detect the reflected light quantity. The difference between the detected reflected light quantities is corrected. A correction value is calculated on the basis of the symmetry of reproduction signals obtained by the reproduction of the first data. The difference of light quantity is multiplied by the correction value to determine the second recording power for recording the second data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording data on an optical disk and reproducing data recorded on the optical disk. The present invention also relates to a data recording irradiation power control method for controlling the irradiation power of a light beam for recording data on an optical disc.

[0002]

2. Description of the Related Art In order to properly record data on an optical disc, it is necessary to adjust the irradiation power of a recording light beam. For example, for a given recording area on an optical disc,
Data is recorded with a recording light beam of a predetermined irradiation power,
There is a method of adjusting the irradiation power based on the result of reproducing this data. Further, there is a method of adjusting the irradiation power by monitoring the reflected light from the optical disk during data recording.

[0003]

For example, optical disks have different recording performances due to differences in manufacturing methods and materials, and there are many optical disks having different recording performances. As an irradiation power adjustment method for obtaining the optimum recording irradiation power for all optical discs having different recording performances, a light beam is irradiated to the adjustment region of the optical disc in accordance with the test pattern, and the adjustment region is adjusted. Record the lever test pattern. Then, the adjustment area is irradiated with a light beam of reproduction power, the reflected light from the adjustment area is detected, and the irradiation power is set from the reproduction result of the recorded data reflected in the reflected light. Was there.

Further, in this irradiation power adjusting method, since the recording is performed with the irradiation power determined in the above-mentioned adjustment area, in order to perform uniform recording on the optical disk surface, when recording the recording data on the optical disk, The amount of light reflected from the optical disk by the light beam having the irradiation power is measured, and the irradiation power is corrected for fluctuations in the light amount. A so-called ROPC (Running Optimu) that changes the irradiation power while recording
m Power Calibration) control was performed. But C
In the case of AV (Constant Angle Velocity) recording, the linear velocity at the recording position changes during recording, this irradiation power may deviate from the optimum irradiation power, and the symmetry of the reproduction signal waveform of recorded data may deteriorate. . Particularly in the case of an optical disc of poor quality, the symmetry of the reproduced signal waveform tends to deteriorate.

An object of the present invention is to solve the above problems. That is, an object of the present invention is to provide an optical disk device and a data irradiation power control method capable of appropriately adjusting the data recording irradiation power.

[0006]

In order to solve the above problems and achieve the object, an optical disk device and a data recording irradiation power control method of the present invention are configured as follows.

(1) The first data is recorded on the optical disc, the recorded first data is reproduced to detect the end of the first data, and the first data is recorded from the position following the detected end. In an optical disk device for recording data No. 2, a test pattern is recorded by changing the recording power in a stepwise manner in the adjustment area of the optical disk, and each recorded test pattern is reproduced to determine the optimum first recording power. And a first recording power determining means for detecting the amount of reflected light when the test pattern is recorded with the first recording power determined by the first recording power determining means.
And second detecting means for recording the first data in the area other than the adjustment area with the first recording power and detecting the light amount of the reflected light from the recorded first data. And a first correction unit that corrects a light amount difference of the reflected light detected by the first and second detection units,
Calculation means for calculating a correction value based on the symmetry of the reproduction signal when reproducing the first data, and second correction for correcting the light quantity difference by the correction value calculated by the calculation means. And a second recording power determining means for determining a second recording power for recording the second data by the second correcting means.

(2) The first data is recorded on the optical disc, the recorded first data is reproduced to detect the end of the first data, and from the position following the detected end, the first data is recorded. In the data recording irradiation power control method for recording data of No. 2, the test pattern is recorded in the adjustment area of the optical disc by changing the recording power stepwise, and each recorded test pattern is reproduced to obtain the optimum first A step of determining a recording power, a step of detecting a light amount of reflected light when the test pattern is recorded with the determined first recording power, and an area other than the adjustment area with the first recording power. Recording the first data and detecting a light quantity of reflected light from the recorded first data; and correcting a detected light quantity difference between the reflected lights. Calculating a correction value based on the symmetry of the reproduction signal when reproducing the first data; multiplying the calculated correction value by the light amount difference to correct; and correcting the correction value with the light amount difference. To determine a second recording power for recording the second data.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example of the optical disk device of the present invention. The optical disk device records data on the optical disk 1 and reproduces data recorded on the optical disk 1. The optical disk device includes a system controller 10, a disk motor 12, an optical pickup 14, an RF amplifier 16, a signal processing circuit 18, a laser emission driver 20, a laser output setting circuit 22, and a ROP.
The C arithmetic processing circuit 23, the comparison correction circuit 24, the RF signal amplitude value detection circuit 26, the encoding processing circuit 28, the buffer memory 30, and the interface 32 are provided.

The system controller 10 controls each part to record data on the optical disc or reproduce the data recorded on the optical disc. The disk motor 12 drives the optical disk to rotate. The optical pickup 14 includes a semiconductor laser that emits a light beam onto the optical disc. This semiconductor laser outputs a light beam of recording power and a light beam of reproducing power.
The optical pickup 14 also includes a photodetector that detects the reflected light from the optical disc. This photodetector converts the reflected light from the optical disk into an electric signal, that is, a reproduction signal, and outputs it.

The RF amplifier 16 generates an RF signal and a servo signal from the reproduction signal. The signal processing circuit 18 decodes the RF signal. Further, the signal processing circuit 18 generates a control signal for controlling the focus and tracking of the optical pickup 14 from the servo signal.
Further, the signal processing circuit 18 generates a control signal for controlling the rotation of the disk motor 12 from the servo signal.

The laser output setting circuit 22 sets the set values of the recording power and the reproducing power of the light beam supplied from the system controller 10. Further, the laser output setting circuit 22 adjusts the set value of the recording power based on the reflectance fluctuation obtained from the RF signal. The laser emission driver 20 causes the semiconductor laser mounted on the optical pickup 14 to emit a light beam having a power based on the setting by the laser output setting circuit 22.

The RF signal amplitude value detection circuit 26 detects the symmetry of the reproduction signal. That is, as shown in FIG. 2, the RF signal amplitude value detection circuit 26 detects the average value of the amplitude of the reproduced signal, and detects the intermediate value between the peak level and the bottom level of the reproduced signal. The comparison correction circuit 24 compares the amplitude average value and the intermediate value, and supplies a difference signal to the ROPC calculation processing circuit 23 based on the comparison result. Specifically, the comparison and correction circuit 24 compares the average amplitude value with the intermediate value, and when the average amplitude value is lower than the intermediate value, the laser emission output is set lower than the value set by the laser output setting circuit 22. The difference signal is output to the ROPC calculation processing circuit 23. On the contrary, the comparison correction circuit 24 compares the amplitude average value with the intermediate value, and when the amplitude average value is higher than the intermediate value, the laser output setting circuit 22.
The differential signal in the direction of increasing the laser emission output from the set value by is output to the ROPC arithmetic processing circuit 23.

The ROPC arithmetic processing circuit 23 determines the amount of reflected light at the optimum recording power determined in the adjustment area within the optical disc with respect to the difference in the amount of reflected light between the recording power for forming the mark on the recording surface of the optical disc and the power for irradiating the non-mark. The difference is set, and when the recording data is recorded in the area other than the adjustment area, the reflected light amount difference during recording is measured. And
A variation (correction amount) between the measured reflected light amount difference and the reflected light amount difference set in the adjustment area is calculated and corrected. That is, when the difference in the amount of reflected light becomes small, the correction is performed in the direction to increase the recording power, and when the difference in the amount of reflected light becomes large, the correction is performed to decrease the recording power. This is called the first correction. Further, the coefficient α is determined from the value of the difference signal from the comparison and correction circuit 24 using the result of the symmetry of the reproduced signal obtained by the reproduction during the additional recording, and the coefficient α is calculated by the first correction. The correction amount is multiplied and corrected. This is called the second correction. The result of the second correction is output to the laser output setting circuit 22. The above coefficient α
Is a comparison result between the amplitude average value of the reproduction signal and the intermediate value between the peak level and the bottom level of the reproduction signal. When the amplitude average value and the intermediate value are almost the same, a coefficient of 1 is set. When the average amplitude value is lower than the intermediate value, that is, when the laser emission output is reduced, α <1 is set. On the contrary, when the average amplitude value is higher than the intermediate value, that is, when the laser emission output is increased, α> The coefficient of 1 is held in a memory (not shown) in the system controller 10.

The encode processing circuit 28 encodes the recording data. The buffer memory 30 temporarily stores the data processed by the encoding processing circuit 28 and the processed data. The interface 32 supplies the recording data from the outside to the encoding processing circuit 28 and supplies the reproduction data decoded by the signal processing circuit 18 to the outside.

The recording performance is adjusted by the system controller 10 when the power of the optical disk device with the optical disk loaded is turned on or when the optical disk is loaded with the optical disk device in the powered on state. . That is, a test pattern is recorded in the adjustment area of the optical disc, and the recording power is adjusted based on the reproduction result of this test pattern. The adjustment area is provided, for example, on the inner circumference side of the optical disc. The adjustment of recording power using this adjustment area is called initial power adjustment.

Here, the initial power adjustment will be described. The system controller 10 causes the encoding processing circuit 28 to generate a test pattern. The laser emission driver 20 emits a semiconductor laser to the test pattern. At this time, the system controller 10 supplies the laser output setting circuit 22 with an output value such that the laser power changes stepwise. Along with this, the power of the semiconductor laser changes stepwise. That is, the test pattern is recorded by the laser power that changes stepwise.
The recording power is determined by reproducing this test pattern. When the recording data is input via the interface 32, the recording data is recorded with the recording power determined by the reproduction of the test pattern.

For example, when the rotation of the optical disc is controlled by CAV, the linear velocity varies depending on the radial position of the optical disc. That is, the linear velocity is higher on the outer circumference than on the inner circumference of the optical disc. As described below, the recording power is controlled according to this change in linear velocity. The recording area of the optical disk is divided into a plurality of pieces in the radial direction. In other words, the recording area of the optical disc is divided into a plurality of donuts having different radial distances. During data recording, when the data recording destination reaches the designated area of the boundary of division and the recording of the data which can be interrupted (when the recording interruption condition is satisfied), the recording is interrupted. The record-interruptible data is a data portion such as a synchronization signal whose recording format is not destroyed.

When the device is vibrated, a recording interruption instruction is issued from the outside. This recording interruption instruction is input through the interface 32. Alternatively, when the recording data is insufficient, an instruction to suspend recording is issued. Recording is interrupted when a recording interruption instruction is issued and the above-described recording interruption conditions are satisfied. When a recording interruption instruction is issued from the outside, the recording interruption flag is returned to the outside after the recording interruption instruction is confirmed. When the vibration stops and the servo control becomes stable, an instruction to restart recording is issued from the outside. Also, when the shortage of recording data is resolved, an instruction to restart recording is issued.

Here, the interruption of the recording due to the lack of the recording data and the restart of the recording due to the elimination of the lack of the recording data will be described. The recording data is transferred to the buffer memory 30 via the interface 32 and the encoding processing circuit 28.
Buffered in. The encoding processing circuit 28 is
The capacity of the recording data buffered in the buffer memory 30 is monitored. When it is detected that the capacity of the recording data buffered in the buffer memory 30 falls below a predetermined capacity, the encoding processing circuit 28 notifies the system controller 10 of a buffer underrun. Upon receiving this notification, the system controller 10 controls each unit to interrupt the recording operation when the recording interrupt condition is satisfied. When it is detected that the capacity of the recording data buffered in the buffer memory 30 has recovered to a predetermined capacity or more while the recording operation is interrupted, the encoding processing circuit 28 causes a buffer under error to the system controller 10. You will be notified of the run cancellation. System controller 10 that received this notification
Controls each unit to restart the recording operation so that the data recorded before the buffer underrun occurs and the data recorded after the buffer underrun is released are continuous. As a result, additional recording is realized.

Now, the restart of the recording operation will be described with reference to FIG. From the time when the recording operation is interrupted until the time when the recording operation is restarted, the optical pickup 14 is held on the track at the radial position where the recording interruption position exists.
When the recording operation is restarted, the optical pickup 14 is jumped from the track at the radial position where the recording interruption position exists toward the inner track (recorded area). After the track jump is completed, the reproduction operation is started. When the recording interruption position is detected by this reproduction, the recording operation is switched from this recording interruption position, and additional recording is started from this recording interruption position. That is, when the recording operation is interrupted after the data is recorded at the predetermined position on the optical disc, the data recorded at the predetermined position is reproduced and the end of the predetermined position is detected. Then, data is recorded again from the unrecorded area following this end.

The point here is to adjust the recording power based on the reproduction signal obtained until the recording interruption position (end) and the amount of light reflected from the optical disc during additional recording. That is, in order to perform recording with the optimum recording power at the time of additional recording, the correction amount calculated in the first correction is multiplied by the coefficient α based on the symmetry of the reproduction signal to adjust the recording power. This is called secondary power adjustment.

Here, the secondary power adjustment will be described. First, the RF signal amplitude value detection circuit 26 detects the symmetry of the reproduction signal. That is, as shown in FIG.
The RF signal amplitude value detection circuit 26 detects the average value of the amplitude of the reproduction signal, and detects the intermediate value between the peak level and the bottom level of the reproduction signal. Then, the comparison and correction circuit 24 compares the amplitude average value and the intermediate value, and based on the comparison result, the difference signal R
It is supplied to the OPC arithmetic processing circuit 23. When the amplitude average value and the intermediate value are almost the same value, the recording power is judged to be optimum. Therefore, the ROPC calculation processing circuit 23 supplies the recording power corrected by the first correction as it is to the laser output setting circuit 22 as the optimum recording power. When the average amplitude value is lower than the intermediate value, it is determined that the recording power is too strong. That is, the ROPC arithmetic processing circuit 23 is supplied with the differential signal for reducing the recording power, calculates the coefficient α (α <1) based on this differential signal, and multiplies the correction amount corrected by the first correction to record. Perform arithmetic processing to reduce power. On the contrary, when the average amplitude value is higher than the intermediate value, it is determined that the recording power is too weak. That is, the ROPC arithmetic processing circuit 23 is supplied with the differential signal for increasing the recording power,
The coefficient α (α> 1) is calculated based on this difference signal, and the calculation amount is increased by multiplying the correction amount corrected by the first correction to increase the recording power. As a result, recording power correction for optimum recording on the recording surface of the optical disc is performed.

Further, the system controller 10 may be provided with a recording power correction table and the recording power correction table may be appropriately used. The recording power correction table stores the correction data of the recording irradiation power prepared for each radial position of the optical disk. When an optical disc in which data is partially recorded is loaded into the optical disc device and additional recording is performed on this optical disc, the adjustment result by the initial power adjustment and the correction data stored in the recording power correction table are used. . In the case of newly additionally recording on an optical disc in which data is partially recorded, it is assumed that data is recorded at a radial position that is far from the radial position where the adjustment area is located. That is, there may be a difference between the recording power adjusted by the initial power adjustment and the optimum recording power at the additional recording position. Therefore, when the rotation of the optical disc is controlled by CAV (constant angular velocity), the difference from the optimum recording power at the additional recording start position tends to be large. Therefore, in order to minimize the adjustment time and the recording power fluctuation amount until the optimum recording power is reached, the recording power adjusted by the initial power adjustment is corrected by the correction data stored in the recording power correction table and used. Thereby, the optimum recording power can be adjusted in a short time.

As described above, by using the secondary power adjustment in addition to the initial power adjustment, or by using the correction data from the recording power correction table in addition to the initial power adjustment, the optimum recording is performed. It can be obtained efficiently. As a result, data can be properly recorded on the entire surface of the optical disc.

The recording power control of the present invention will be summarized below with reference to the flow chart shown in FIG.

When the power of the optical disk device with the optical disk loaded is turned on (ST10, YES), or when the optical disk is loaded with the optical disk device in the powered on state (ST10, YES). The system controller 10 starts the initial power adjustment and the initial value setting of the ROPC arithmetic processing circuit 23. (ST1
2). This initial value is the recording power adjusted by the initial power adjustment. The detailed description of the initial power adjustment is as described above.

When the system controller 10 receives the data recording request (YES in ST14), the laser output setting circuit 22 causes the recording irradiation power and ROP adjusted in the initial power to be adjusted.
The initial value of the C arithmetic processing circuit 23 is set. The initial value of the ROPC arithmetic processing circuit 23 is the initial power adjusted recording power. In addition, for example, in the case of newly additionally recording on an optical disc in which data has already been partially recorded, the recording power adjusted by the initial power adjustment is corrected based on the correction data of the recording power correction table of the system controller 10. And set. As a result, in the case of recording at a radial position far from the adjustment area, the recording power adjusted by the initial power adjustment cannot be used as it is, and therefore the recording power suitable for the radial position of the recording destination is used by using the recording power correction table. You can record data with.

When the recording irradiation power is set (ST1
6) Recording is started (ST18). When recording is started with the set recording power, the ROPC arithmetic processing circuit 2
In step 3, the variation (correction amount) between the reflected light amount difference during recording in a region other than the adjustment region and the reflected light amount difference in the adjustment region due to the initial power adjustment is calculated and corrected (ST19).
The calculated correction amount is held in a memory (not shown) of the ROPC calculation processing circuit 23.

During this recording, an instruction to interrupt the recording operation is confirmed (ST20, YES), and when the recording interrupt condition is satisfied (ST22, YES), the system controller 10 interrupts the recording operation (ST24). After that, when the instruction to restart the recording operation is confirmed (ST26, YES), the system controller 10 executes the track jump and reproduces the recorded track to restart the recording operation (S26).
T28). At this time, the recording power is adjusted based on the reproduction signal obtained until the recording interruption position (end) is detected. That is, the RF signal amplitude detection circuit 26 detects the average value of the amplitude of the reproduced signal and detects the intermediate value between the peak level and the bottom level of the reproduced signal (ST30). And
The comparison correction circuit 24 compares the amplitude average value and the intermediate value,
The ROPC arithmetic processing circuit 23 calculates the difference signal based on the comparison result.
Supply to.

The ROPC calculation processing circuit 23 calculates the coefficient α based on this difference signal. That is, when the amplitude average value and the intermediate value are approximately the same value (ST32, NO) (S
(T34, NO) (ST36), the recording power is determined to be optimum, the coefficient α is set to 1 and recording is performed on the optical disc with the recording power corrected by the first correction. When the average amplitude value is lower than the intermediate value (ST32, NO) (ST3
4, YES), it is determined that the recording irradiation power is too strong,
As a correction to reduce the recording power, the recording power down coefficient α
(Α <1) is set, and the correction amount calculated in step 19 is multiplied by this coefficient α (ST40). As a result, the recording power is reduced. On the contrary, when the amplitude average value is higher than the intermediate value (ST32, YES) (ST42), it is determined that the recording power is too weak, and the recording power-up coefficient α (α> 1) is set as a correction for increasing the recording irradiation power. Then, the correction amount calculated in step 19 is multiplied by this coefficient α (ST44). This increases the recording power. Such adjustment of the recording power is executed during reproduction until the recording interruption position is detected. Therefore, the recording power is corrected by the first correction until the recording interruption instruction or the recording interruption condition is generated, and when the recording interruption instruction or the recording interruption condition is generated, the coefficient α is determined by the first determination by the symmetry of the reproduction signal. Data is recorded with the optimum recording power by multiplying the correction amount in the correction of (ST18). After this, when there is no recording interruption instruction (ST20, NO) and recording is completed (ST46, YES), the recording operation is completed. When data is recorded on the innermost track of the optical disk after data is recorded on the outer track of the optical disk, the recording power adjusted by the initial power adjustment and the initial value of the ROPC arithmetic processing circuit 23 are set. To be done.

In the above description, the case where the buffer underrun occurs due to the shortage of the recording data and the buffer underrun cancellation occurs along with the elimination of the shortage of the recording data has been described. However, the present invention is not limited to this. For example, the system controller 10 may generate the buffer underrun and the buffer underrun cancellation at a predetermined timing regardless of the recording data capacity. As a result, additional recording is executed at a predetermined timing, and the recording power is controlled at a predetermined timing accordingly. The predetermined timing will be described more specifically.

That is, when the buffer underrun does not occur for a predetermined period after the additional recording is executed and the recording power is controlled accordingly, the system controller 10 intentionally causes the buffer underrun and the buffer underrun cancellation. You may do it. As a result, the recording power is regularly controlled. Alternatively, the system controller 10 may intentionally generate the buffer underrun and the buffer underrun cancellation when the buffer underrun does not occur for a predetermined period regardless of the execution of additional recording and the accompanying recording power control. Good. As a result, the recording power is regularly controlled.

As described above, regarding the difference in the reflected light amount between the recording power for forming the mark on the recording surface of the optical disc and the power for irradiating the non-mark, the difference in the reflected light amount and the adjustment region at the optimum recording power determined in the adjustment region in the optical disc. When the recording data is recorded in the area other than the above, the variation (correction amount) with respect to the reflected light amount difference during recording is calculated, and the recording power determined in the adjustment area is corrected (first correction). Then, when recording interruption occurs, a coefficient α is calculated based on the result of comparison between the average amplitude value of the reproduction signal and the intermediate value between the peak level and the bottom level of the reproduction signal, and this coefficient α is calculated by The recording power is corrected by multiplying the correction amount) (second correction). Thus, for example, if the recording irradiation power determined in the adjustment area is erroneously recognized due to some action, the data is recorded based on the recording power determined in the adjustment area. I will record with power. Therefore, when the recording is interrupted, the recording power is adjusted from the symmetry of the reproduction signal, so that the recording can be always performed with the optimum recording power. If the recording power is already recorded on a part of the optical disc, the recording power determined by the initial power adjustment is corrected based on the recording start position by referring to the recording power correction table. The corrected recording power is recorded with the optimum recording power by performing the second correction when the recording is interrupted while performing the first correction.

The present invention is not limited to the above-described embodiment, and can be variously modified at the stage of implementation without departing from the scope of the invention. Further, the respective embodiments may be combined as appropriate as much as possible, in which case the combined effects can be obtained.

[0037]

According to the present invention, it is possible to provide an optical disk device and a data irradiation power control method capable of appropriately adjusting the data recording irradiation power.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an optical disk device of the present invention.

FIG. 2 is a diagram for explaining an average amplitude value of a reproduction signal and an intermediate value between a peak level and a bottom level of the reproduction signal.

FIG. 3 is a diagram for explaining resumption of a recording operation.

FIG. 4 is a flowchart for explaining recording power control.

[Explanation of symbols]

10 system controller 12 disk motor 14 Optical pickup 16 RF amplifier 18 Signal processing circuit 20 Laser emission driver 22 Laser output setting circuit 23 ROPC arithmetic processing circuit 24 Comparison correction circuit 26 RF signal amplitude value detection circuit 28 Encoding processing circuit 30 buffer memory 32 interfaces

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Claims (6)

[Claims] 1. A first data is recorded on an optical disc, the recorded first data is reproduced to detect an end of the first data, and a second position is added from a position following the detected end. In the optical disc device for recording the data, the test pattern is recorded in the adjustment area of the optical disc by changing the recording power stepwise, and each recorded test pattern is reproduced to determine the optimum first recording power. First
Recording power determining means, first detecting means for detecting the amount of reflected light when the test pattern is recorded with the first recording power determined by the first recording power determining means, and the adjustment Second detecting means for recording the first data with the first recording power in an area other than the area and detecting a light quantity of reflected light from the recorded first data; First correction means for correcting the light quantity difference of the reflected light detected by the second detection means; calculation means for calculating a correction value based on the symmetry of the reproduction signal when reproducing the first data; A second correction unit that corrects the light amount difference by multiplying the correction value calculated by the calculation unit, and a second recording power for recording the second data by the second correction unit. Second to decide Optical disk apparatus characterized by comprising a recording power determination means. 2. The calculating means calculates the intermediate level and the intermediate level between the peak level and the bottom level of the reproduced signal obtained by reproducing the first data, and the average level of the reproduced signal. When the average levels are equal, the correction value is a factor of 1, when the intermediate level is higher than the average level, the correction value is smaller than 1, and when the intermediate level is lower than the average level, the correction value is 1. The optical disk device according to claim 1, wherein the optical disk device has a larger coefficient. 3. When the correction value calculated by the calculating means is a coefficient of 1 ×, the second data is obtained with the first recording power determined by the first recording power determining means. The optical disc device according to claim 1, wherein the optical disc is recorded. 4. A first data is recorded on an optical disc, the recorded first data is reproduced to detect an end of the first data, and a second position is added from a position following the detected end. In the data recording irradiation power control method for recording the data, the test pattern is recorded in the adjustment area of the optical disc while the recording power is changed step by step, and each recorded test pattern is reproduced to perform the optimum first recording. Determining the power, detecting the amount of reflected light when the test pattern is recorded with the determined first recording power, and using the first recording power in an area other than the adjustment area. Recording first data, detecting a light quantity of reflected light from the recorded first data, correcting a detected light quantity difference of each reflected light, Calculating a correction value based on the symmetry of the reproduction signal when reproducing the data of No. 1; multiplying the calculated correction value by the light amount difference to correct; and correcting the correction value to the light amount difference. And a step of determining a second recording power for recording the second data by multiplying, the data recording irradiation power control method. 5. In the calculating step, the intermediate level and the intermediate level between the peak level and the bottom level of the reproduction signal obtained by reproducing the first data, and the average level of the reproduction signal are calculated. When the average levels are equal, the correction value is a factor of 1, when the intermediate level is higher than the average level, the correction value is smaller than 1, and when the intermediate level is lower than the average level, the correction value is 1. The data recording irradiation power control method according to claim 4, wherein a larger coefficient is used. 6. The second data is recorded with the first recording power when the correction value calculated in the calculating step has a coefficient of 1 ×. Data recording irradiation power control method.