JP2011159370A - Optical disk recorder and method of deciding optimum recording power - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recorder which reduces the effect even if a value significantly deviates from optimum power is included when determining an optimum recording power through a plurality of OPCs, and reduces the effect even if there is dust or dirt in a place subjected to OPC. <P>SOLUTION: A controller (control section) 5 controls a signal processing section 4 and executes trial recording to determine the optimum recording power. The controller 5 performs OPCs (trial recording) a plurality of times on an optical disk 1, and determines the center value of a plurality of optimum recording powers obtained by the OPCs to decide it as the final optimum recording power. Further, OPCs are executed a plurality of times in a plurality of jump areas which are not continuous on the optical disk. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optimum recording power determination technique for realizing stable recording quality in an optical disk recording apparatus.

  In a recordable optical disk, it is always necessary to record with an optimum recording power in order to obtain good recording quality. In an optical disc recording apparatus, an optimum recording power is determined in advance for each disc, and recording is performed using a recording power that matches the disc identification code. Alternatively, there is a method in which the manufacturer records the optimum power as data on the optical disc, and the recording device reads the power value and performs recording. However, in any case, the predetermined recording power is the average recording power under standard conditions. Under actual recording conditions, temperature changes, mechanical deformation of the disk, component performance variations of the drive device, and performance There is a change over time, and the average recording power cannot be recorded with good quality. Therefore, a technique called OPC (Optimum Power Control) is employed in which trial recording is performed before recording using the recording apparatus and the disk, and the optimum recording power is calculated.

  The OPC performs recording while changing the recording power in an area PCA (Power Calibration Area) provided on the disk, and processes the reproduction signal level to obtain the optimum power. By carrying out such OPC, the optimum recording power suitable for the recording conditions is obtained, but in reality, an error occurs in the calculated power due to various factors during the OPC. As an example of an error factor, if dust or dirt adheres to the place where the OPC is performed or a disk defect exists, a correct reproduction signal amplitude cannot be obtained. Therefore, a performance index for determining the optimum recording power (β and later described) Since γ) cannot be obtained correctly, an error occurs in the optimum recording power. Also, if there is sensitivity unevenness in the PCA area, a difference occurs in the reproduction signal amplitude depending on the place of use, resulting in an error in optimum recording power. Even when the recording laser spot is not correctly positioned at the center of the track due to the eccentricity of the disc, an error occurs in the reproduction signal amplitude, and an error occurs in the optimum recording power. In addition, in the RW disc, since the same place is used a plurality of times, the performance changes due to this, and the recording film may be destroyed or deteriorated due to previous recording with strong power.

  In order to reduce these errors, a method of performing OPC multiple times has been proposed. For example, Patent Document 1 discloses that when recording a test pattern for OPC, a more accurate optimum recording power is derived by setting a starting power differently for each test. In Patent Document 2, test data is recorded continuously in each of three consecutive areas of the optical disc, and the three primary optimum recording powers obtained from this are averaged to obtain the optimum recording. Determining power is disclosed.

JP 2007-141438 A JP 2008-108340 A

  However, the method of obtaining the average value by performing OPC multiple times is effective only when the result of each OPC is within the range centered on the optimum recording power, and any one of the OPC results is far from the optimum power. If the average value is too high, there is a problem that the average value also deviates from the true optimum recording power due to the influence of the outlier. In addition, since continuous adjacent areas are used as recording areas, there remains a problem that each OPC is affected by dust and dirt and deviates from the optimum power even if averaged. As a result, it is inevitable that the calculated optimum recording power has an error.

  SUMMARY OF THE INVENTION In view of the above problems, the present invention has an object to reduce the influence of an optimum recording power obtained from a plurality of OPCs even if a value greatly deviating from the optimum power is included in the optimum recording power. Another object of the present invention is to reduce the error in the calculated value of the optimum recording power by making it less likely to be affected by dust and dirt present at the OPC execution place.

  The present invention relates to a spindle motor that rotates and drives the optical disk, and irradiates the optical disk with a recording / reproducing laser beam in an optical disk recording apparatus that obtains an optimum recording power by performing trial recording before starting recording on the optical disk. An optical pickup; a signal processing unit that outputs a recording signal to the optical pickup and receives a reproduction signal from the optical pickup; and a control unit that controls the signal processing unit to perform trial recording and obtain an optimum recording power. The control unit performs trial recording a plurality of times on the optical disc, obtains a median value of a plurality of optimum recording powers obtained by each trial recording, and determines the final optimum recording power.

  The present invention relates to an optimum recording power determination method for obtaining an optimum recording power by performing trial recording before starting recording on an optical disc, setting a start address on the optical disc at which trial recording is started, and a test signal used for trial recording. A scan range of recording power is set, the test signal in which the recording power is changed stepwise is recorded on the optical disc, the test signal is reproduced from the optical disc, and the performance of the reproduced signal is analyzed. The optimum recording power for obtaining the target performance is calculated, and a plurality of optimum recording powers are obtained by executing the test recording a plurality of times, and the median of the obtained optimum recording powers is obtained. To determine the final optimum recording power.

  Further, the plurality of test recordings are performed in a plurality of jump regions that are not continuous with each other on the optical disc.

  According to the present invention, when the optimum recording power is obtained from a plurality of times of OPC, even if a value greatly deviating from the optimum power is included in the optimum recording power, the influence is hardly affected. In addition, even if dust or dirt is present at the OPC execution place, it is less likely to be affected. As a result, it is possible to provide an optical disc recording apparatus that realizes stable recording quality.

1 is an apparatus configuration diagram showing an embodiment of an optical disk recording apparatus according to the present invention. The figure which shows typically the test recording signal for OPC. The figure which shows the example of the reproduction signal of a test signal. Explanatory drawing of the calculation method (beta method) of optimal power. Explanatory drawing of the calculation method (gamma method) of optimal power. The figure explaining the method of determining a representative value from several optimal recording power. The figure explaining the setting method of the test area | region which performs multiple times of OPC. 3 is a flowchart showing a first embodiment of a method for determining optimum recording power according to the present invention. 9 is a flowchart showing a second embodiment of the optimum recording power determination method according to the present invention. 9 is a flowchart showing a third embodiment of the optimum recording power determination method according to the present invention. 9 is a flowchart showing a fourth embodiment of the optimum recording power determination method according to the present invention.

FIG. 1 is an apparatus configuration diagram showing an embodiment of an optical disk recording apparatus according to the present invention.
The optical disk recording apparatus outputs a recording signal to the optical pickup 3, a spindle motor 2 that rotationally drives the optical disk 1, an optical pickup 3 that irradiates the optical disk 1 with a recording / reproducing laser light beam, and an optical pickup 3 It has a signal processing unit 4 to which a reproduction signal is input and a control unit (controller) 5 that controls these operations. Here, the signal processing unit 4 generates a test signal in which the recording power is changed stepwise in order to perform test recording (OPC) for calculating the optimum recording power for each of the mounted optical discs, and the optical pickup. 3, and a test signal reproduced from the optical pickup 3 is analyzed to obtain performance index values (β value and γ value) described later. Addresses are also sequentially specified for the test area PCA on the disk at that time. The controller 5 executes the OPC process according to a predetermined procedure, calculates each value of the test result, and determines the optimum recording power. Also, each test result is evaluated to determine success / failure, and a retry (retest) is executed as necessary.

  When the optimum recording power is determined, recording conditions are set according to the optimum recording power, and data is recorded and reproduced. The signal processing unit 4 transfers recording / reproduction data to / from the host PC 11 connected to the outside via the interface 43. The reproduction signal from the optical pickup 3 is waveform-shaped by the RF signal amplification / waveform equalization unit 12 and error-corrected by the demodulation unit 41 and the error correction unit 42 to become a reproduction data signal. With respect to the recording data, an error correction code is added by the correction code generation unit 44 and a modulation signal is recorded by the modulation unit 45. In accordance with the recording modulation signal, the laser driving unit 13 drives the laser light source of the optical pickup 3 to record data on the optical disc 1. The servo signal amplifying unit 14 amplifies the focus / tracking signal during recording / reproduction obtained from the optical pickup 3, and the servo calculation unit 46, based on this, the focus / tracking driving unit 15, the moving motor driving unit 16, the spindle motor. The drive unit 17 is controlled.

Here, an outline of the OPC process will be described with reference to FIGS.
FIG. 2 is a diagram schematically showing a test recording signal for OPC. The power scanning recording is performed while sequentially changing the recording power. FIG. 2 shows an example in which recording is performed by switching the recording power of 16 stages for each sector. The power scanning range (start power and power change width) is set as an initial value in advance at the start of each test, but is changed as necessary. FIG. 2 shows an example in which recording is performed while changing from high power to low power, but conversely, recording may be performed from low power to high power.

  FIG. 3 is a diagram illustrating an example of a reproduction signal of the test signal. The amplitude of the reproduction signal changes according to the recording power. In the vertical axis of FIG. 3, the upper level is the DC erasure level and the lower level is the recording depth. This depends on the configuration of the signal detection circuit. It is not limited to. In the signal analysis, the upper level and the lower level of the reproduction signal as shown in FIG. 3 are measured for each recording power.

  Next, calculation of optimum power will be described. In general, the β (beta) method is used for R system (single recording) discs and the γ (gamma) method is used for RW (rewrite) discs as performance indexes for calculating optimum power. Evaluation methods based on the β method and the γ method are defined in standards, and will be described briefly.

FIG. 4 is an explanatory diagram of an optimum power calculation method (β method). The waveform of the reproduction signal after removing the direct current component from the reproduction signal of FIG. 3 is schematically shown. The center of amplitude of the AC component is set to the zero level, the positive side signal level A and the negative side amplitude level B of the long wavelength component are obtained, and β is calculated by the equation (1). Here, β indicates amplitude asymmetry, and β = 0 is a target recording state (target β), and the recording power at that time is the optimum recording power Popt. Alternatively, a value deviated from 0 may be set as target β, and the recording power corresponding to this may be determined as the optimum recording power.
β = (A + B) / (A−B) (1)
(A + B): the difference between the peak levels of the HF signal
(AB): the peak-to-peak value of the HF signal

Next, FIG. 5 is an explanatory diagram of an optimal power calculation method (γ method). First, the degree of modulation m (modulation) is obtained from the reproduced signal of FIG. 3, and γ is calculated by the equation (2).
γ = (dm / dPw) · (Pw / m) (2)
m: the modulation amplitude of the HF signal
Pw: Write power

  FIG. 5 shows a schematic tendency of the change of the γ value with respect to the recording power. A recording power Pw is calculated such that the calculated γ value becomes a predetermined target value targetγ, and a predetermined coefficient (ρ) is added to Pw to determine an optimum recording power Popt.

  In both the β method and the γ method, it is necessary to set the recording power change range in OPC to a range in which target β (target β) and γ (target γ) can be obtained. If the target value cannot be obtained, the recording power range is changed and a retry (retest) is executed.

Next, a method for determining the representative value of the optimum recording power and a method for setting the test area in this embodiment will be described.
FIG. 6 is a diagram for explaining a method for determining a representative value from a plurality of optimum recording powers.
For example, it is assumed that the optimum recording powers of OPC1 to OPC4 are obtained as a result of performing the number of trials N = 4, respectively. Among these, for example, it is assumed that the N = 1 optimum recording power OPC1 is greatly deviated from the original optimum power Po. According to the conventional averaging method, the representative value is determined from these simple average values Pa. As a result, under the influence of the deviated optimum recording power OPC1, the average value Pa becomes a value greatly deviated from the optimum power Po, and the error becomes large.

  On the other hand, the method of this embodiment adopts the median value of each optimum recording power. That is, in this example, the average value of the two values located at the center, OPC2 and OPC4, is used as the representative value. As a result, the median value Pc is closer to the optimum power Po, and the error is extremely small. Note that when the number of trials N is an odd number, only one value is located at the center, so that value may be adopted.

  Even in the conventional averaging method, it is expected that the error gradually decreases as the number of trials N is increased, but the OPC processing time increases and is not practical. On the other hand, according to the method using the median value of the present embodiment, data outside the frequency distribution of the recording power is removed, so that a value close to the optimum power Po can be easily obtained even with a small number of trials. Can be obtained.

FIG. 7 is a diagram for explaining a test area setting method for executing OPC multiple times.
In one OPC, an area composed of 16 sectors in the power adjustment area PCA is used from the outer peripheral side toward the inner peripheral side. One power stage is assigned to one sector of the address, and if the power change is 16 stages, 16 sectors are used.

  In the conventional method, the test area of each OPC is continuous. For example, when the number of trials N = 1 is performed from the start address K, the test area in each OPC is such that N = 2 starts from the start address K-16, N = 3 starts from the start address K-32, and so on. Was continuous. The reason why the address value is subtracted by 16 is that the scanning direction of the test area (from the outer peripheral side to the inner peripheral side) is the direction in which the address value decreases. In this case, if there is dirt on the disc, adhesion of foreign matter, disc defects, etc. (indicated by reference numeral 70) in the test area, the N = 1, N = 2 second OPC test will fail, or the results obtained will be large. An error will be included. This is because if the size of the defective portion 70 is small, the damage is limited to only one test, but in general, the damage spans a plurality of areas, and a plurality of tests are often damaged continuously.

  On the other hand, in the present embodiment, the test areas of the respective OPCs are performed in areas that are discontinuous with each other (hereinafter referred to as jump areas). For example, when the number of trials N = 1 is performed from the start address K, the second OPC area is N = 2, the start address K-32 is N = 2, the start address K-64 is N = 3, and so on. This is performed by skipping a gap G of (16 sectors). As a result, even if the defect 70 exists in the test area, the N = 1 test fails, but the N = 2 and subsequent tests are not affected, and the OPC does not fail continuously. The size G of the gap may be determined according to the size of the defect 70. When the size of the defect is large, the gap G may be allocated with two or more OPC regions. Alternatively, the gap G may be set not only to an integral multiple of the size of the OPC area (16 sectors) but also to a real multiple, and each gap G may be a variable length instead of a fixed length. As a result, the number of failures when executing OPC multiple times can be minimized, and by combining with the adoption of the median described above, a value close to the optimum power Po can be easily obtained with a small number of trials. Will be able to.

  The power adjustment area PCA for performing OPC is normally set at the inner periphery, but may be installed at the outer periphery in addition to this. OPC is more accurate when performed at the actual recording speed. If it is a CLV (Constant Linear Velocity) recording system that performs recording at a constant recording speed from the inner circumference to the outer circumference, only OPC in the inner circumference area may be used. However, the recording speed becomes faster toward the outer circumference with constant disc rotation. When the CAV (Constant Angular Velocity) recording method is performed, the inner peripheral recording speed and the outer peripheral recording speed are different, so that it is necessary to perform OPC not only on the inner periphery but also on the outer periphery. In addition, the optical disk is divided into a plurality of areas in the radial direction, each area is recorded by a CLV recording system with a constant recording speed, and the outer circumference also in the ZCLV (Zone CLV) recording system in which the recording speed of the outer peripheral area is increased. There is a need to perform OPC. In addition, a method of providing a power adjustment region in each of the plurality of regions has been proposed. The present embodiment does not limit the position of the power adjustment area and the recording method, and can correspond to any of them.

  Hereinafter, the method for determining the optimum recording power according to the present invention will be described separately in the first to fourth embodiments.

  FIG. 8 is a flowchart showing a first embodiment of the optimum recording power determination method according to the present invention. The target is an RW (repeated recording) disk, and the optimum recording power is obtained by the γ method from a plurality of OPCs, and the representative value is determined from the median value of the plurality of optimum recording powers as shown in FIG. It is.

  At the start of OPC, the OPC start address K is first determined (step S101). In CD-R / RW and DVD-R / RW, it is determined that the power adjustment area PCA is used from the outer periphery side toward the inner periphery. In addition, in DVD + RW, it is stipulated that an implementation location is selected at random. Next, as a counter initialization, the success number S and error number E counters are initialized to 0 (step S102). Here, the success number S counts the case where the result of each OPC is within a predetermined range, and the error number E means the case where the result of the OPC is not within a predetermined range and the retry is not successful. Count.

  As the power setting initialization, a recording start power and a recording power change width are set (step S103). These values are set by reading data stored in advance in the memory in the apparatus corresponding to each recording disk. Next, as the retry number initialization, the retry number R is initialized to 0 (step S104). Here, the retry is to execute the OPC again by changing the recording power or the like when the OPC result to be described later is not within a predetermined range for some reason. The retry operation can be performed until the retry number R reaches the retry upper limit value Rmax. In the direct current erasing process, direct current erasure of the OPC execution place is performed (step S105). Since the OPC execution location is not necessarily an unused area, it is erased and initialized.

  In power scanning recording, a test signal in which the recording power is sequentially changed is recorded as shown in FIG. 2 (step S106). The recording start power and the power change width are those set in step S103. Next, the area where the test recording has been performed is reproduced to obtain a reproduction signal as shown in FIG. Then, the amplitude (upper level and lower level) of the reproduction signal is measured, and the degree of modulation m is obtained for each recording power (step S107). Subsequently, in the optimum power calculation, γ is calculated by the equation (2) using the data of the modulation degree m. Then, as shown in FIG. 5, Pw that is the target γ (target γ) is obtained, and the coefficient ρ is added to Pw to calculate the optimum recording power Popt (step S108).

  Next, it is determined whether the calculated optimum recording power Popt is appropriate (step S109). Of course, in order to obtain target γ correctly, the power scanning range must be set to a range including target γ, and Pw needs to be at an appropriate position in the power scanning range in order to obtain the accuracy. There is. However, since the recording start power and the recording power change range that the apparatus holds in advance are determined by the standard drive in the standard environment, the correct power scanning is not necessarily performed due to the temperature at the time of actual OPC execution and the performance variation of the drive. May not be in range. Therefore, it is determined whether or not the calculated optimum recording power Popt (or Pw value corresponding to target γ) is within a predetermined range. If the result of determination is that it is within a predetermined range, it is determined that the current OPC is successful, and 1 is added to the number of successful counters S (step S110). As a result of the determination, if it is not within the predetermined range, it is determined that the operation has failed and the operation proceeds to the retry operation.

  In the retry operation, the power scanning range such as the recording start power and the power change width is changed (step S111). Then, 1 is added to the retry number R of the counter (step S112), and the retry number R is compared with the retry upper limit value Rmax (step S113). If the retry number R does not exceed the upper limit value Rmax, the process proceeds to step S105 and OPC is executed again. The result of the retry OPC is determined in step S109, and if successful, the process proceeds to step S110. If unsuccessful, the process proceeds to step S111, the power setting condition is changed again, and retry OPC is repeated. If the retry number R exceeds the upper limit value Rmax in the determination in step S113, it is determined that the current OPC is an error, and 1 is added to the error number E of the counter (step S114). Note that the retry operation is not counted as the number of trials, and 1 is added to the number of trials at the end of the retry.

  When one OPC is completed and the result of success or error is found, the total number of successful counters S and the number of errors E (S + E), that is, the number of OPC trials is compared with a predetermined trial number upper limit Nmax. (Step S115). If the number of OPC trials (S + E) does not exceed the upper limit value Nmax, the process proceeds to the next OPC trial. In the next OPC, a new start address is set to move the test area (step S116). Specifically, 16 is subtracted from the previous start address K, and this is set as a new start address, so that the continuous areas shown in FIG. 7 are set. The reason why 16 is subtracted is to move only 16 sectors (use area for one OPC) from the outer periphery side to the inner periphery side of the power adjustment region. In step S103, the power setting is initialized and the next OPC is performed.

  When a plurality of OPCs are completed and the number of OPC trials (S + E) exceeds the upper limit value Nmax, the success number S of the counter is compared with the lower limit value Smin of success numbers (step S117). If the success number S exceeds the lower limit value Smin, the median value Pc is obtained as shown in FIG. 6 from the optimum recording power Popt for the number of successes calculated in step S108, and the final optimum recording power ( The representative value is determined (step S118). If the success number S is less than the lower limit value Smin, the series of OPC processes is determined to be an error and is terminated (step S119).

  As described above, according to the method of the first embodiment, in step S118, the median value Pc of the plurality of optimum recording powers Popt is obtained and determined as the final optimum recording power. Therefore, even if a value greatly deviating from the true optimum power is included in the plurality of optimum recording powers, it is less susceptible to the influence, and a value closer to the true optimum power can be obtained.

  FIG. 9 is a flowchart showing a second embodiment of the optimum recording power determination method according to the present invention. Similar to the first embodiment (FIG. 8), the target is an RW disc, and the optimum recording power is obtained from the OPC by a plurality of times by the γ method, and the optimum recording power representative value is determined from the median value. Furthermore, in the second embodiment, when the retry process is executed for a certain number of trials, the power setting change condition used in the retry process is applied to the next trial. In FIG. 9, the same steps as those in FIG. 8 are denoted by the same reference numerals. In the following, points different from FIG. 8 will be described.

  If the number of OPC trials (S + E) does not exceed the upper limit value Nmax in step S115, the process proceeds to the next OPC trial. At that time, it is determined whether or not the current retry number R is 0 (step S121). If R = 0, the previous trial was performed without retry, and if R ≠ 0, it indicates that the previous trial was performed including a retry. If R ≠ 0 as a result of determination, the power setting change value at the time of retry (the latest value set in step S111) is read, and the initial value of the power setting for the next OPC is changed (step S122). Then, after setting the start address (step S116) and initializing the retry number R (step S104), the next OPC is started.

  As described above, the cause of changing the power setting is often due to variations in temperature and drive performance. Therefore, if the initial value of the power setting is returned to the value held in advance in each OPC as in the first embodiment (step S103), there is a high possibility that the same retry is performed every time, leading to an increase in the OPC time. Therefore, as in this embodiment, when the power setting is changed by the previous retry OPC (step S111), it is highly possible that the OPC succeeds in one shot by changing the power initial value by that value. Therefore, it is possible to prevent unnecessary retry processing from being performed and to shorten the OPC time.

  FIG. 10 is a flowchart showing a third embodiment of the optimum recording power determination method according to the present invention. Similar to the first embodiment (FIG. 8), the target is an RW disc, and the optimum recording power is obtained from the OPC by a plurality of times by the γ method, and the optimum recording power representative value is determined from the median value. Further, in the third embodiment, the test areas of each OPC are set to discontinuous areas (flying areas) as shown in FIG. In FIG. 10, the same steps as those in FIG. 8 are denoted by the same reference numerals. In the following, points different from FIG. 8 will be described.

  If the number of OPC trials (S + E) does not exceed the upper limit value Nmax in step S115, the process proceeds to the next OPC trial. In the next start address setting, a value obtained by subtracting 16 × i (i is an integer of 2 or more) from the previous start address is set (step S131). As a result, the next OPC is executed in a discontinuous area (flying area).

  Incidentally, in the first embodiment (FIG. 8), 16 is subtracted from the previous start address K and set to the continuous area shown in FIG. 7 (step S116). If there is a defect, the OPC test may fail continuously or may contain a large error continuously. On the other hand, in this embodiment, each test area is a jump area, so that even if a large defect exists on the disk, the OPC test fails continuously or contains a large error continuously. Disappears.

  FIG. 11 is a flowchart showing a fourth embodiment of the optimum recording power determination method according to the present invention. The target is an R-system (one-time recording) disk, the optimum recording power is obtained by the β method from a plurality of times of OPC, and the representative value is determined from the median value of the plurality of optimum recording powers as shown in FIG. Is. In FIG. 11, the same steps as those in the first embodiment (FIG. 8) are denoted by the same reference numerals. In the following, points different from FIG. 8 will be described.

  Since the R-system disc cannot be recorded over the same area, the direct current erasure (step S105) in the first embodiment (FIG. 8) is eliminated. Further, since it is necessary to use a different area every time even when retrying, the next start address is set and moved to a continuous area (step S141).

  Also in the fourth embodiment, in step S118, the median value Pc of the plurality of optimum recording powers Popt is obtained, and this is determined as the final optimum recording power. Therefore, even if a value greatly deviating from the true optimum power is included in the plurality of optimum recording powers, it is less susceptible to the influence, and a value closer to the true optimum power can be obtained.

  Although the embodiments of the optimum recording power determination method according to the present invention have been described above, the techniques of the embodiments can be appropriately combined. For example, if the step (step S122) of changing the power setting initial value in the second embodiment (FIG. 9) is introduced in the third embodiment (FIG. 10) or the fourth embodiment (FIG. 11), the effects of the respective embodiments are combined. Therefore, it is possible to provide a better technique for determining optimum recording power.

1 ... Optical disc,
2 ... Spindle motor,
3 ... Optical pickup,
4 ... Signal processing unit,
5: Control unit (controller).

Claims (7)

In an optical disk recording apparatus for obtaining an optimum recording power by performing test recording before starting recording on an optical disk,
A spindle motor for rotationally driving the optical disc;
An optical pickup for irradiating the optical disc with a laser beam for recording / reproducing;
A signal processing unit for outputting a recording signal to the optical pickup and receiving a reproduction signal from the optical pickup;
A control unit for controlling the signal processing unit to perform test recording and obtaining optimum recording power,
The controller performs a plurality of trial recordings on the optical disc, obtains a median value of a plurality of optimum recording powers obtained by the respective trial recordings, and determines a final optimum recording power. Optical disk recording device. The optical disk recording apparatus according to claim 1,
The optical disc recording apparatus, wherein the plurality of test recordings are performed in a plurality of jump regions that are not continuous with each other on the optical disc. The optical disk recording apparatus according to claim 2, wherein
An optical disc recording apparatus characterized in that a plurality of jump areas for executing the trial recording are set with an interval of an integral multiple of the area used in one trial recording as a unit. In the optimum recording power determination method for obtaining the optimum recording power by performing test recording before starting recording on the optical disc,
Set the start address on the optical disc to start test recording,
Set the scan range of the recording power of the test signal used for test recording,
Recording the test signal in which the recording power is changed in stages on the optical disc,
Play the test signal from the optical disc and analyze the performance of the playback signal,
Calculating the optimum recording power for obtaining the target performance from the analysis result,
A plurality of optimum recording powers are obtained by executing the test recording a plurality of times,
A method for determining an optimum recording power, comprising: determining a median value of the plurality of obtained optimum recording powers and determining a final optimum recording power. The optimal recording power determination method according to claim 4,
When setting a start address for starting test recording on the optical disc,
A method for determining optimum recording power, wherein the plurality of test recording areas are set to a plurality of jump areas that are not continuous with each other on the optical disc. In the optimum recording power determination method according to claim 5,
A method for determining optimum recording power, characterized in that a plurality of jump areas for executing the trial recording are set with an interval of an integral multiple of the area used in one trial recording as a unit. The optimal recording power determination method according to any one of claims 4 to 6,
The success / failure of the trial recording is determined based on whether or not the optimum recording power calculated by the trial recording is included within a predetermined range.
If the test recording fails as a result of the determination, the recording power scanning range of the test signal is changed to perform a trial recording retry process,
When trial recording by the retry process is successful, the optimum recording power determination method is characterized in that the scan range of the recording power of the test signal used for the next trial recording is changed to the scan range used in the successful retry process. .

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