JP2000020956A - Optical disc device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately set up a recording power. SOLUTION: An amplitude detecting circuit 12 detects a peak value of an output signal of PD7 amplified by a head amplifier 9. The peak value detected by the amplitude detecting circuit 12 is read into a drive controller 11, and it is, for example, compared with a suitable target value to binarize the detected signal and adjusts a gain of a variable gain amplifier, and stably binalized in an analog signal processing circuit 10. Determination of a test light power for trial writing in a test track of a magneto-optical disk 2 and operation of an actual recording power in each zone of the magneto-optical disk 2, based on the test light power are executed by the control of the drive controller 11 in a recording power operation circuit 13. A sector for inhibiting the trial writing in the test track is stored in a storage circuit 14.

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, and more particularly, to an optical disk device characterized by a recording power setting portion.

[0002]

2. Description of the Related Art An optical disk has been attracting attention as a storage medium serving as a core of multimedia which has been rapidly developing in recent years. For example, in a 3.5-inch magneto-optical disk, in addition to the conventional 128 MB and 230 MB, it has recently been increasing. , 54
High-density recording media such as 0 MB and 640 MB are also being provided.

[0003] For example, a 3.5-inch magneto-optical disk employs ZCAV recording (zone constant angular velocity recording) in which a medium track is divided into zones and the number of sectors in each zone is the same. The number of zones of the magneto-optical medium is
The conventional 128 MB medium is limited to one zone, and the 230 MB medium is limited to 10 zones.
In a high-density recording medium such as 0 MB or 640 MB, the track pitch of the medium has become narrower and the number of zones has been greatly increased with an increase in the recording density.

That is, the 640 MB medium has 11 zones and the number of zones is relatively small, while the 540 MB medium has 18 zones and the number of zones has almost doubled compared to the conventional one. Normally, in the case of a magneto-optical disk, there is a difference in the optimum recording power for each medium. Therefore, when the medium is loaded, light emission adjustment is performed to perform test writing for each zone and adjust the recording power to the optimum. .

As shown in, for example, Japanese Patent Application Laid-Open No. 9-293259, trial writing is performed in an inner zone and an outer zone, and the recording power in the zone between the zones is obtained by linear approximation to adjust light emission. It can be carried out.

In the conventional 128 MB or 230 MB medium, recording is performed by pit position modulation (PPM), and the light emission power may be changed in two steps of the erase power and the recording power. However, in the 540 MB or 640 MB medium, the recording density is increased. Therefore, recording by pulse radiation modulation (PWM) is adopted. In this PWM recording, it is necessary to change the light emission power in three stages of the erase power, the first write power, and the second write power.

As an example, recording on a 540/640 MB capacity magneto-optical disk specified by ISO / IEC15041 will be described. Unlike conventional magneto-optical recording, 540/640 MB capacity magneto-optical recording has "0" and "1".
In the binary recording, the recording value "1" is represented not by the recording signal itself but by the start and end of the recording signal (hereinafter referred to as an edge). In the edge recording, a good jitter characteristic at a recording signal edge portion is required.

For this reason, in a 540/640 MB magneto-optical disk, as shown in FIG. 16, pre-heat power (hereinafter referred to as P1) for raising the medium temperature before signal recording, and independent recording power for the front and rear edges are used. A certain front edge portion recording power (hereinafter referred to as P2) and a rear edge portion recording power (hereinafter referred to as P3) are provided.
To avoid thermal interference between the front and rear edges based on 1
Signal recording is performed by pulse train recording using so-called ternary power in which P2 and P3 are arranged in a comb shape.

As described above, in the case of a magneto-optical disk,
Since there is a difference in the optimum recording power for each temperature and medium, it is necessary to determine the recording power for each zone by trial writing.

Therefore, for example, Japanese Patent Application Laid-Open No. 62-285258
In this publication, standard data is stored in a ROM or the like in advance, an environmental temperature is measured, a drive current value for each radius of the magneto-optical disk corresponding to the environmental temperature is read from the standard data, and a duty of the drive current value is read. A semiconductor laser is driven by a square wave having a ratio of 50% to perform test writing on a magneto-optical disk.
Then, the data recorded by trial writing is reproduced using the light receiving element and the secondary distortion detecting circuit. At this time, the drive power of the semiconductor laser is varied so that the duty ratio of the reproduced signal is 50%, that is, the output of the secondary distortion detection circuit becomes zero, and recording and reproduction are repeated to determine the recording power for each zone. are doing.

[0011]

However, the duty ratio of the reproduced signal in the above-mentioned Japanese Patent Application Laid-Open No. 62-285258 varies due to unevenness in sensitivity or rotation deviation of the magneto-optical disk. The conventional method has a problem that the recording power cannot be determined with high accuracy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an optical disk device capable of setting recording power with high accuracy.

[0013]

According to the present invention, there is provided an optical disk apparatus for setting a recording power of a laser beam when data is recorded in a test area on a recording medium. Control means, information reproducing means for reading and reproducing the recorded information on the recording medium recorded with the power, amplitude measuring means for measuring the amplitude of the reproduced signal reproduced by the information reproducing means,
The power is sequentially varied in the test area on the recording medium by the laser control means to write data, and the amplitude measurement means measures the amplitude of the reproduction signal of the data in the test area. Recording power calculation means for calculating the recording power based on the test power which is the power when the power falls within a predetermined range, and limiting means for limiting the amplitude measurement in the test area. It is composed.

In the optical disk apparatus of the present invention, data is written by sequentially varying the power in the test area on the recording medium by the laser control means, and the reproduction of the data in the test area is performed by the amplitude measuring means. The recording power calculating means calculates the recording power based on the test power that is the power when the amplitude measurement result enters a predetermined range, and the limiting means calculates the recording power. By limiting the amplitude measurement in the test area, it is possible to set the recording power with high accuracy.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 13 relate to a first embodiment of the present invention. FIG. 1 is a configuration diagram showing a configuration of a magneto-optical disk device, and FIG. 2 is an optical disk mounted on the magneto-optical disk device of FIG. FIG. 3 is a configuration diagram showing a configuration of a recording area of a magnetic disk, FIG. 3 is a configuration diagram showing a configuration of a test track and a buffer track of FIG. 2, FIG. 4 is a first flowchart for explaining the operation of the magneto-optical disk device of FIG. FIG. 5 is a second flowchart for explaining the operation of the magneto-optical disk device of FIG. 1, and FIG.
FIG. 7 is a diagram showing an example of the recording power calculated according to the flowchart of FIG. 5, and FIG. 7 is a first explanatory diagram illustrating a first example of a coefficient multiplied by the test write power used in the flowchart of FIG. 8 is a second explanatory diagram for explaining a first example of a coefficient multiplied by the test write power used in the flowchart of FIG. 5, and FIG. 9 is a diagram of a coefficient multiplied by the test write power used in the flowchart of FIG. FIG. 10 is a first explanatory diagram for explaining a second example, FIG. 10 is a second explanatory diagram for explaining a second example of a coefficient multiplied by the test write power used in the flowchart of FIG. 5, and FIG. FIG. 12 is a third explanatory diagram illustrating a second example of the coefficient multiplied by the test write power used in the flowchart of FIG. Fourth explanatory diagram for explaining a second example of the coefficient, FIG. 13 is a flowchart showing a modification of the flowchart of FIG.

As shown in FIG. 1, in the magneto-optical disk drive 1 of this embodiment, a magneto-optical disk 2 for recording information magneto-optically is inserted, and the magneto-optical disk 2 is connected to a spindle motor 3 by a loading mechanism (not shown). It is mounted and driven to rotate. An optical pickup 4 as an optical head is installed near the spindle motor 3 so as to be movable in the radial direction of the magneto-optical disk 2, and a laser beam 5 for recording and reproduction is directed toward the magneto-optical disk 2. Irradiation.

The optical pickup 4 is provided with a laser diode (hereinafter, referred to as LD) 6 for emitting laser light 5 and a photodetector (hereinafter, referred to as PD) 7 for receiving light reflected from the magneto-optical disk 2. An optical system (not shown) for irradiating the laser beam 5 from the LD 6 to a minute spot and irradiating the PD 7 with reflected light from the magneto-optical disk 2 is provided.

An LD driver 8 is connected to the LD 6, and a driving current is supplied to the LD 6 by the LD driver 8. On the other hand, an analog signal processing circuit 10 is connected to the PD 7 via a head amplifier 9. The output signal of the PD 7 is amplified by the head amplifier 9 and then binarized by the analog signal processing circuit 10. I have.

The binarized signal binarized by the analog signal processing circuit 10 is sent to the drive controller 11, where the signal is demodulated and error corrected by the drive controller 11, and converted into data recorded on the magneto-optical disk 2. Is read. The read data is sent to, for example, a host computer (not shown) to perform various processes.

The amplitude detection circuit 12 is a head amplifier 9
The peak value of the output signal of the PD 7 amplified by the above is detected. The peak value detected by the amplitude detection circuit 12 is read by the drive controller 11, and is compared with, for example, a target value appropriate for binarizing the detection signal, and the gain of a variable gain amplifier (not shown) is adjusted. At 10, the binarization process can be stably performed.

A recording power calculation circuit 13 and a storage circuit 14 are connected to the drive controller 11. The recording power calculation circuit 13 controls the recording power calculation circuit 13 under test control on a test track of the magneto-optical disk 2, which will be described later. And the calculation of the actual recording power in each zone of the magneto-optical disk 2 based on the test write power. On the other hand, the storage circuit 14 stores a sector in which test writing on a test track is prohibited.

The magneto-optical disk drive 1 is provided with focusing means and tracking means (not shown).

The magneto-optical disk 2 is, for example, a 540 MB medium, and as shown in FIG.
7 and 18 zones are provided (ISO / IEC1
5041). In each zone, a buffer track is provided between an adjacent zone in addition to a user area for recording data, and a test track is provided between the outermost peripheral portion of the user area and the buffer track. ing. Generally, test writing is performed on this test track to determine the recording power of the magneto-optical disk. In this embodiment, first, test writing is performed on the test track of zone 0, which is the inner peripheral zone, and the recording power on zone 0 is determined. Is determined, and then test writing is performed on a test track in zone 16 which is the outer peripheral zone, the recording power in zone 16 is determined, and the recording power in zone 0 and the recording power in zone 16 are used to perform linear approximation. Thus, the recording power of another zone is determined.

Here, as shown in FIG. 3, in the same zone (zone 0 or zone 16), sectors are provided radially and the sector ID portions are provided at the same positions in the radial direction, but are adjacent to each other. In the zone (zone 1 or zone 17), since the sector configuration is different, the radial position of the ID portion is different. Therefore, in test writing on a test track, depending on the sector, the signal of the ID portion of the adjacent zone is read at the time of reading depending on the sector. There is a problem that the signal amplitude cannot be accurately measured by the amplitude detection circuit 12 because the signal leaks due to birefringence and spike noise or the like is generated.

Therefore, in the present embodiment, the test write-inhibited sector in the test track in zone 0 shown in Table 1 and the test-write-inhibited sector in the test track in zone 16 shown in Table 2 are stored in the storage circuit 14. Have been.

[0027]

[Table 1]

[Table 2] As described above, in the present embodiment, the test writing is performed in the zone 0 and the zone 16; however, the present invention is not limited to this. The recording power of the other zones may be determined by linear approximation based on this. In this case, the setting time of the recording power can be reduced, and one or a plurality of zones other than the two zones of zone 0 and zone 16 can be determined. Test writing may be performed on the zones, and in this case, the recording power of each zone can be accurately determined.

Next, the operation of the present embodiment thus configured will be described. That is, a method of determining the recording power by trial writing in the magneto-optical disk device 1 of the present embodiment will be described.

First, when the magneto-optical disk 2 is loaded on the magneto-optical disk device 1, as shown in FIG. 4, the drive controller 11 moves the optical pickup to a test track where test writing is performed in step S1. The test track in this case is the test track in zone 0 (see FIG. 2).

Next, in step S2, a predetermined initial value is set to the test write power Pt, and in step S3, a predetermined test track for performing test writing except for the test writing prohibited sector stored in the storage circuit 14 is set. Write to sector.

Here, since the amplitude of the data pattern to be written is measured in a later operation, it is desirable to repeat a single pattern.

Then, in step S4, the drive controller 11 measures the amplitude of the data written in step S3 by monitoring the output from the amplitude detection circuit 12, and in step S5, the amplitude value monitored in step S4 is defined in advance. It is determined whether it is smaller than the prescribed lower limit value. If it is smaller, the test write power Pt is increased in step S6, and the increased test write power Pt reaches the upper limit value Pmax of the actual recording power in step S7. It is determined whether or not the upper limit value Pma
If the number has reached x, error processing is performed and the processing is terminated. If the number has not reached the upper limit value Pmax, the flow returns to step S3 to perform writing again.

If it is determined in step S5 that the monitored amplitude value is equal to or greater than the predetermined lower limit value, then in step S8, it is determined whether the monitored amplitude value is within the predetermined upper limit value. In step S9, if the test write power P
t, and the test write power Pt further reduced in step S10 becomes the lower limit value Pmi of the actual recording power.
n is determined, and if the lower limit value Pmin is reached, error processing is performed and the process is terminated.
If not, the process returns to step S3 to perform writing again. By repeating this operation, the test write power Pt in which the amplitude value of the written data falls within a specified range.
To determine.

If the target value of the amplitude (the center of the specified range) is too small, an error in amplitude measurement due to noise increases, which is not preferable. On the other hand, if the target value of the amplitude is too large, the amplitude of the written data becomes saturated, so that the fluctuation of the amplitude with respect to the fluctuation of the write power becomes small and the error of the test write power Pt becomes large.

If it is determined in step S8 that the monitored amplitude value is within the predetermined upper limit value, as shown in FIG. 5, the test track power is determined by the test write power determined in step S11. The write is performed in the sector No. and the amplitude of the data written in step S12 is monitored. Then, in step S13, it is determined whether or not the amplitude value monitored in the separate sector is within a range of a specified value defined by a specified upper limit value and a specified lower limit value. If not, the process moves to another sector in step S14. Then, the process returns to step S2 in FIG. 4 to repeat the processing.

If the amplitude value is within the specified range in step S13, the data actually multiplied by a value obtained by multiplying the test write power Pt determined in step S15 by a factor by the recording power calculation circuit 13 in step S15. This is the recording power for writing. Here, in the case of multi-level recording using a pulse train as shown in FIG. 6, the test write power Pt determined for each peak power (P1, P2, P3,..., Pn) is multiplied by a factor (α1, α2, α).
3,..., Αn). Note that this coefficient α
.., Αn are stored in the recording power calculation circuit 13 in advance.

Subsequently, returning to FIG. 5, in step S16, a write operation is performed on a predetermined sector with the recording power determined in step S15, and it is determined in step S17 whether the write operation is normal (no error occurs during verification). If not, an error process is performed and the process is terminated. If completed, it is determined in step S18 whether or not the test track is zone 16. If the test track is zone 16, a straight line is determined based on the recording power in zone 0 and zone 16. The approximation is performed to determine the recording power of another zone, and the process ends.

In the above description, the test track is zone 0
Therefore, the process returns from step S18 to step S1 of FIG. 4, moves to the test track of zone 16 in step S1, repeats the above processing, determines the recording power in zone 16, and in step S18, determines the recording power in zone 0 and zone 16. Linear approximation is performed based on the recording power to determine the recording power of another zone, and the process is terminated. Zone 16
, The test write power Pt in step S2
Is the test write power P determined in zone 0
It is calculated and set based on t.

The coefficient αi (i = 1 to n) is a temperature, a disk format, a band for performing test writing, a disk type (a direct overwrite (DOW) disk, or a non-direct overwrite disk (NON-DO).
W) It is desirable to set an appropriate value according to the disk or the like.

Here, a first example of the setting of the coefficient αi (i = 1 to n) will be described as an example in which a signal is recorded by pulse train recording using ternary power (P1, P, P3).

In general, when judging a signal for recording on an optical disk,
The determination based on the error rate is used. When the above three values are made variable, the error rate fluctuates, however, error correction (hereinafter referred to as ECC) is performed in the signal reading of the optical disk drive, and a recording signal having an error rate characteristic up to a certain level is obtained. Then, the signal can be read normally. The variation of the error rate characteristic when the ratio of P1, P2, and P3 is kept constant and the power of P3 is varied is plotted on the graph of FIG. At this time, assuming that the error rate indicated by the black line is the error rate limit that can be corrected by ECC, a good recording area in FIG. 7 is defined by Pmin ≦ P3 ≦ Pmax (hereinafter, this recording area Pmax). -Pmin
Is described as a power margin).

By changing the ratio of P1: P2: P3 and measuring the error rate when P3 is made variable, the power margin for each ratio can be measured. Using this to create a graph plotting the ratio of P1 and P3 on the x-axis, the ratio of P2 and P3 on the y-axis, and the power margin value on the z-axis, the power is plotted in the z-axis direction as shown in FIG. You can create a graph that draws contour lines of the margin. In this graph, the peak portion and the region where the power margin can be ensured the most are the power ratios of P1 and P2 to P3.

That is, P1 = a1 × P3, P2 = a2 × P3 (a1, a
2 is a constant) Further, in the error rate characteristic graph for P2 at the top of the power margin, the writing start power Pmin
Then, a power fluctuation that can be predicted when recording is performed by the drive, for example, a detection error in the measurement of the test write power Pt, and an error in the drive electric system are estimated as margins, and set as a target value of P3.

That is, P3 = Pmin / b (b is an error considered during recording on the optical disk drive) Here, by estimating the maximum error considered in the drive, b can be defined as a constant. If the ratio of Pmin to the test write power Pt is c, then Pmin = c × Pt Since Pmin and Pt both vary depending on the recording sensitivity of the medium, the ratio is represented by a unique constant c.

Therefore, by obtaining the test write power Pt, P1 = a1 × c / b × Pt = α1 × Pt P2 = a2 × c / b × Pt = α2 × Pt P3 = c / b × Pt = α3 × Pt, and the optimum value of 3 for the test write power Pt
The value powers P1, P2 and P3 are unique constant ratios, α1, α
2, α3.

That is, α1, α2, and α3 may be stored in the recording power calculation circuit 13.

Next, the second setting of the coefficient αi (i = 1 to n)
Will be described. In a 540/640 MB capacity magneto-optical disk defined by ISO / IEC15041, there is a light modulation direct overwrite recording (hereinafter, LIM-D).
Discs (described as OW) are also defined. In the LIM-D0W disk, of the ternary pulse train recording, the erasing operation is performed with the power of P1 and the recording is performed with the powers of P2 and P3, thereby enabling overwriting without performing the erasing operation. .

At this time, it is desirable that the power P1 be set with a sufficient margin for erasing in order to simultaneously perform the erasing operation in addition to the optimization of the jitter characteristic of the recording signal. FIG. 9 shows the erasing and recording characteristics of the LIM-DOW disk.
It describes in. When P1 is set at a constant ratio α1 from the test write power Pt, if the variation of the test write power Pt due to variations in production of disks and drives is ± d, then ± d1 = ± d × α1, the erasing operation and the sufficient It is necessary to confirm that there is a recording power margin.

Therefore, the results of the power margin measurement of P3 with P1 fixed at P1 and P1 ± d1, and with the ratio of P2: P3 changed, are shown in FIGS. 9 to 11. In FIG. 10 to FIG. 12, P1 which can secure the power margin at the ratio of P2: P3 and has the power margin of P1 ± d1 is selected, and the ratio between P1 and Pt is P1 = α1 × Pt. Further, from the optimum ratio of P2: P3, P2 = a2 × P3, and further, the maximum error b considered in the drive with respect to the start of writing P3 is estimated. P3 = Pmin / b Further, the ratio of P3 and Pt Depends on the sensitivity, so that Pmin = c × Pt.

Therefore, in the LIM-DOW disk, P1 = α1 × Pt P2 = a2 × c / b × Pt = α2 × Pt P3 = c / b × Pt = α3 × Pt as in the case of a normal disk. For each test write power Pt,
The value powers P1, P2 and P3 are unique constant ratios, α1, α
2, α3.

That is, in the case of a LIM-DOW disk, α1, α2, α3 may be stored in the recording power calculation circuit 13.

As described above, in this embodiment, the amplitude of the reproduced signal of the written information is measured, the test write power Pt is determined based on the measured value, and a predetermined coefficient is added to the determined test write power Pt. The recording power is set by the multiplication, and the amplitude measurement is not affected by the sensitivity unevenness or the rotation deviation of the magneto-optical disk, so that the recording power of each zone can be set with high accuracy.

The test write power Pt is determined by
Although performed in steps S1 to S10 in FIG. 3, the present invention is not limited to this, and may be configured as shown in FIG.

That is, as shown in FIG. 13, after the processing of steps S1 to S4 is completed, in step S31, the amplitude value monitored in step S4 is smaller than the first target lower limit value defined in advance. It is determined whether the test write power Pt is, for example, 0.
The power is increased by 3 mW, the process returns to step S3, and writing is performed again.

If it is determined in step S31 that the amplitude value monitored in step S4 is equal to or larger than the predetermined first target lower limit value, in step S33, the monitored amplitude value is specified in advance. It is determined whether the value is within the first target upper limit value. If the first target upper limit value is exceeded, the test write power Pt is reduced to, for example, 0.3 m in step S34.
W is decreased, and the process returns to step S3 to perform writing again.

If it is determined in step S33 that the monitored amplitude value is within the predetermined first target upper limit value, a test is performed in step S35 to determine the range of the first target lower limit value to the first target upper limit value. Write to a predetermined sector with write power Pt. In step S36, the amplitude of the data written in step S35 is measured by monitoring the output from the amplitude detection circuit 12, and the process proceeds to step S3.
It is determined whether the monitored amplitude value in step 7 is smaller than a second target lower limit value larger than the first target lower limit value defined in advance. If the amplitude value is smaller, the test write power Pt is increased by, for example, 0.1 mW in step S38. Returning to step S35, writing is performed again.

Also, in step S37, step S36
If it is determined that the monitored amplitude value is equal to or larger than the second target lower limit value specified in advance, in step S39,
It is determined whether or not the monitored amplitude value is within a second target upper limit value smaller than a first target upper limit value defined in advance. If the monitored amplitude value exceeds the second target upper limit value, the test write power Pt is set to, for example, 0.5 in step S40. Decrease by 1 mW, step S3
Return to step 5 and write again. This operation may be repeated to determine the test write power Pt in which the amplitude value of the written data falls within the specified range, and the subsequent processing may shift to step S11 described with reference to FIG.

By performing the processing as shown in FIG. 13, the test write power Pt is determined in two steps according to the amplitude range level, so that the test write power Pt can be determined at high speed. .

FIGS. 14 and 15 relate to the second embodiment of the present invention. FIG. 14 is a diagram showing the configuration of a magneto-optical disk device, and FIG. 15 is a timing chart showing the operation of the magneto-optical disk device of FIG. FIG.

Since the second embodiment is almost the same as the first embodiment, only different points will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

As shown in FIG. 14, in the magneto-optical disk device 1a of the present embodiment, the first counter 21 and the second counter 21 which count a predetermined value by using a sector mark (SM) of a sector from the drive controller 11 as a trigger. The first counter 22 is controlled by the drive controller 11
23 that outputs the count-up signal of the counter 21 or the second counter 22 to the amplitude detection circuit 12a
And the amplitude detection circuit 12a is connected to the selector 2
3 from the first counter 21 or the second counter 22
When the count-up signal is input, amplitude detection is performed.

At the time of trial writing, the drive controller 11
As shown in FIG. 15, when a sector mark is read, a trigger signal is sent to a first counter 21 and a second counter 22.
Output to The first counter 21 counts for a first time and outputs a count-up signal to the selector 23,
Counter 22 counts a second time longer than the first time and outputs a count-up signal to the selector 23.
When the current sector of the test track is a test write-inhibited sector (see Tables 1 and 2) stored in the storage circuit 14, the drive controller 11 outputs the second counter 22
The selector 23 is controlled so as to select the count-up signal of the test track, and the current sector of the test track is stored in the storage circuit 14.
If the sector is not the test write-inhibited sector stored in the selector 23, the selector 23 is controlled so as to select the count-up signal of the first counter 21. Thereby, the amplitude detection circuit 1
In step 2a, the amplitude is measured at a data recording unit that is a predetermined distance away from the ID unit having the sector mark.

The other structure and operation are the same as in the first embodiment.

As described above, in the present embodiment, similarly to the first embodiment, in addition to the effect that the influence of the signal of the ID portion of the adjacent buffer track can be eliminated,
Since amplitude measurement in the affected sector is possible, efficient measurement is possible.

[0065]

As described above, according to the optical disk apparatus of the present invention, the power is sequentially varied in the test area on the recording medium by the laser control means to write data, and the data in the test area is written by the amplitude measurement means. The recording power calculating means calculates the recording power based on the test power, which is the power when the amplitude measurement result falls within a predetermined range, and the limiting means operates in the test area. Since the amplitude measurement is limited, there is an effect that the recording power can be accurately set.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a magneto-optical disk device according to a first embodiment of the present invention;

FIG. 2 is a configuration diagram showing a configuration of a recording area of a magneto-optical disk mounted on the magneto-optical disk device of FIG. 1;

FIG. 3 is a configuration diagram showing a configuration of a test track and a buffer track of FIG. 2;

FIG. 4 is a first flowchart illustrating the operation of the magneto-optical disk device of FIG. 1;

FIG. 5 is a second flowchart for explaining the operation of the magneto-optical disk device of FIG. 1;

FIG. 6 is a diagram showing an example of recording power calculated according to the flowchart of FIG.

FIG. 7 is a first explanatory diagram illustrating a first example of a coefficient multiplied by the test write power used in the flowchart of FIG. 5;

FIG. 8 is a second explanatory diagram illustrating a first example of a coefficient multiplied by the test write power used in the flowchart of FIG. 5;

FIG. 9 is a first explanatory diagram illustrating a second example of a coefficient multiplied by the test write power used in the flowchart of FIG. 5;

FIG. 10 is a second diagram illustrating a second example of the coefficient multiplied by the test write power used in the flowchart of FIG. 5;
Illustration of

FIG. 11 is a third diagram illustrating a second example of the coefficient multiplied by the test write power used in the flowchart of FIG. 5;
Illustration of

FIG. 12 is a fourth diagram illustrating a second example of the coefficient multiplied by the test write power used in the flowchart of FIG. 5;
Illustration of

FIG. 13 is a flowchart showing a modification of the flowchart of FIG. 4;

FIG. 14 is a configuration diagram showing a configuration of a magneto-optical disk device according to a second embodiment of the present invention;

FIG. 15 is a timing chart showing the operation of the magneto-optical disk device of FIG.

FIG. 16 is a diagram showing a recording power waveform in a conventional pulse train recording.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk device 2 ... Magneto-optical disk 3 ... Spindle motor 4 ... Optical pickup 6 ... LD 7 ... PD 8 ... LD driver 9 ... Head amplifier 10 ... Analog signal processing circuit 11 ... Drive controller 12 ... Amplitude detection circuit 13 ... Recording power calculation circuit 14 ... Storage circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D090 AA01 BB04 CC01 CC02 CC05 CC18 DD03 DD05 FF30 HH01 JJ12 KK03 5D119 AA23 AA43 BA01 BB03 DA01 FA02 HA19 HA36

Claims (3)

[Claims] 1. An optical disc apparatus for setting a recording power of a laser beam when recording data in a test area on a recording medium, comprising: a laser control unit for arbitrarily controlling the power of the laser beam; Information reproducing means for reading and reproducing information recorded on a recording medium; amplitude measuring means for measuring the amplitude of a reproduced signal reproduced by the information reproducing means; and the power in the test area on the recording medium by the laser control means. Are sequentially varied to write data, the amplitude measuring means measures the amplitude of the reproduction signal of the data in the test area, and the power when the amplitude measurement result falls within a predetermined range is determined. Recording power calculating means for calculating the recording power based on a certain test power; and controlling the amplitude measurement in the test area. Further comprising a limiting means for the optical disk apparatus according to claim. 2. The method according to claim 1, wherein the limiting unit includes a storage unit storing a sector for limiting the amplitude measurement in the test area, and prohibits the amplitude measurement in the sector stored in the storage unit. 2. The optical disk device according to claim 1, wherein: 3. The optical disk apparatus according to claim 2, wherein the limiting unit shifts the amplitude measurement in the sector stored in the storage unit by a predetermined position.