JP2001256648A - Control method of optical recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce rate of data error rate of mark edge recording method. SOLUTION: The data recording property of a mounted optical recording medium is inspected, and a correction value of the recording pulse width is set. The length of the recording mark can be stipulated to a prescribed value accordingly, and data error, etc., at the time of data reproduction are suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses an exchangeable optical recording medium as a recording medium and performs a data recording operation in a state where the pulse width of a recording pulse is corrected from the pulse width at the time of recording modulation during data recording. The present invention relates to a method for controlling an optical recording apparatus.

[0002]

2. Description of the Related Art In an optical disk apparatus using a replaceable disk-shaped optical recording medium (hereinafter referred to as an optical disk) such as a magneto-optical disk as a recording medium, a mark edge recording method (mark length recording) is used as a method for recording data at high density. Method) is used.

In this mark edge recording method, for example,
As shown in FIGS. 13A to 13C, after the recording data is modulated according to the (1, 7, 2, 3, 3) RLL modulation rule,
A recording signal (recording pulse) is formed by applying the NRZI modulation method to the modulated recording data, and a recording mark corresponding to the recording signal is formed on the optical disk by driving the semiconductor laser element of the optical pickup device with the recording signal. To thereby record data.

A reproduced signal obtained by reproducing a recording mark (see FIG. 13D) is binarized by a predetermined threshold TL to be converted into a binarized pulse (see FIG. 13E). Then, the recording data is reproduced based on the edge position of the binarized pulse.

[0005] Incidentally, the optical conductivity of an optical disk mounted on an optical disk device varies to some extent within an allowable range (for example, in a standard), for example, because the material is different depending on the manufacturer. In addition, even for optical disks of the same type made by the same manufacturer, the thermal conductivity varies to some extent depending on the individual.

As described above, the thermal conductivity of the optical disc varies, causing the following inconvenience.

That is, as shown in FIG.
When a recording pulse having a certain pulse width is applied to the semiconductor laser element, a recording mark MKa as shown in FIG. 3B is formed on the optical disk having a small thermal conductivity, and an optical disk having a large thermal conductivity. Is formed with a recording mark MKb, as shown in FIG.

Here, when the thermal conductivity is large, the area heated by the spot of the laser beam is larger than when the thermal conductivity is small, so that the recording mark MK
In some cases, the length LB of the recording mark MKb becomes longer than the length LA of the line a, so that a mark error cannot be detected properly during data reproduction and a data error occurs.

Therefore, in order to solve such inconvenience, for example, as shown in FIGS. 15A to 15C, a corrected recording pulse having a reduced recording pulse width is formed, and this corrected pulse is formed. A method has been proposed in which data recording is performed using a recording pulse that has been made, so that the length of a recording mark is set to an appropriate value.

[0010]

However, in such a conventional apparatus, the length of a recording mark can be made closer to a theoretical value for a specific type of optical disk, but depending on the type of optical disk, data errors can be reduced. There is a problem that cannot be solved.

The present invention has been made in view of the above circumstances, and provides a control method of an optical recording apparatus capable of setting a recording mark length to a theoretical value at the time of data recording regardless of the state of an optical disk. It is an object.

[0012]

According to the present invention, an exchangeable optical recording medium is used as a recording medium, and at the time of data recording, the data recording is performed with the pulse width of the recording pulse corrected from the pulse width at the time of recording modulation. In the method for controlling an optical recording apparatus that performs an operation, a first recording pattern having a short recording mark length and a second recording pattern having a long recording mark length are recorded in a predetermined area of an optical recording medium, respectively. The first recording pattern and the second recording pattern are respectively reproduced, and a first midpoint value corresponding to a midpoint of an envelope of a reproduction signal of the first recording pattern and reproduction of the second recording pattern are reproduced. A second midpoint value corresponding to a midpoint of the signal envelope is detected, and a difference value obtained by subtracting the second midpoint value from the first midpoint value is equal to or less than a predetermined value. So that the recording pulse It is obtained so as to set the correction value of the pulse width.

In addition, a control of an optical recording apparatus which uses a replaceable optical recording medium as a recording medium and performs a data recording operation in a state where a pulse width of a recording pulse is corrected from a pulse width at the time of recording modulation during data recording. In the method,
An initial setting process of setting a correction value of a recording pulse to a predetermined initial value; a first recording pattern having a short recording mark length in a predetermined area of the optical recording medium; and a second recording pattern having a long recording mark length.
Are recorded respectively, and the first recording pattern and the second recording pattern are respectively reproduced, and the first midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the first recording pattern is recorded. And a midpoint value inspection process for respectively detecting a second midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the second recording pattern, and the first midpoint obtained by the midpoint value inspection process. The midpoint value difference determination processing for determining that the absolute value of the difference obtained by subtracting the value from the second midpoint value is equal to or smaller than a predetermined value, and the difference in the midpoint value difference determination processing When the absolute value of is larger than a predetermined value,
After resetting the correction value of the recording pulse based on the sign of the difference, a control process for repeatedly executing the midpoint value inspection process is performed.

In addition, a control of an optical recording apparatus that uses a replaceable optical recording medium as a recording medium and performs a data recording operation in a state where a pulse width of a recording pulse is corrected from a pulse width at the time of recording modulation during data recording. In the method,
An initial setting process of setting a correction value of a recording pulse to a predetermined initial value; a first recording pattern having a short recording mark length in a predetermined area of the optical recording medium; and a second recording pattern having a long recording mark length.
Are recorded respectively, and the first recording pattern and the second recording pattern are respectively reproduced, and the first recording pattern corresponding to the amplitude of the reproduction signal of the first recording pattern is reproduced.
And a second amplitude value corresponding to the amplitude of the reproduced signal of the second recording pattern, respectively, and a first intermediate value corresponding to the midpoint of the envelope of the reproduced signal of the first recording pattern. An amplitude midpoint value inspection process for detecting a point value and a second midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the second recording pattern, respectively, and the second midpoint value inspection process obtained by the amplitude midpoint value inspection process. The quotient value obtained by dividing the amplitude value of 1 by the second amplitude value is obtained by an amplitude value ratio determination process for determining that the quotient value is equal to or more than a predetermined value, and the amplitude midpoint value inspection process. A midpoint value difference determination process for determining that an absolute value of a difference obtained by subtracting the first midpoint value from the second midpoint value is equal to or smaller than a predetermined value, and the amplitude value ratio In the determination process, it is determined that the value of the quotient is not equal to or more than a predetermined value, When it is determined that the absolute value of the difference is not smaller than or equal to a predetermined value in the midpoint value difference determination process, after the correction value of the recording pulse is reset based on the sign of the difference, A control process for repeatedly executing the value inspection process is performed.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in detail.

FIG. 1 shows a main configuration of a magneto-optical disk drive according to one embodiment of the present invention. It should be noted that parts not directly related to the present invention (for example, a magnetic head mechanism, etc.) are omitted in FIG.

Referring to FIG. 1, a magneto-optical disk 4 is removably mounted on a turntable 3 fixed to a rotating shaft 2 of a spindle motor 1. Data is recorded / reproduced / erased by the pickup device 5. The optical pickup device 5 is provided with a seek mechanism 6 for moving the magneto-optical disk 4 in the radial direction.

The magneto-optical disk 4 is handled in a state housed in a disk cartridge (not shown).
Further, the magneto-optical disk device is provided with a loading mechanism (not shown) for arranging and discharging the disk cartridge and the magneto-optical disk 4 at predetermined positions. The optical pickup device 5 includes a well-known light source optical system such as a semiconductor laser device that generates a laser beam, a well-known objective lens system for focusing the laser beam on the recording surface of the magneto-optical disk 4, and a magneto-optical disk 4. A well-known detection optical system and the like for receiving reflected light from the light source and forming various signals are provided. The objective lens system is provided with a well-known objective lens moving mechanism for moving the objective lens in the focusing direction and the tracking direction.

As shown in FIG. 2A, a recording area of the magneto-optical disk 4 has a test area CK at a predetermined position which can be used for inspecting data recording conditions.
z is provided.

On the recording surface of the magneto-optical disk 4, a large number of recording tracks are formed at predetermined intervals, and each recording track has a predetermined number m of sectors as shown in FIG. Are formed. Each sector has a header area HDA in which a sector address for identifying the sector, flag data indicating a data recording state, and the like, and user data are recorded, as shown in FIG. It consists of a possible user data area UDA.

In this embodiment, the correction value of the pulse width of the recording pulse at the time of data recording is determined as follows.

For example, when the recording data is (1, 7, 2, 3)
After modulating according to the RLL modulation rule, a recording pulse (NRZI) is applied by applying the NRZI modulation method to the modulated recording data.
When the recording mark corresponding to the recording signal is recorded on the optical disk, two types of patterns, the shortest repeating pattern and the longest repeating pattern, are recorded, and the reproduced signals of these patterns are recorded. Based on this, the optimum correction value of the pulse width of the recording pulse when recording data on the magneto-optical disk 4 is determined.

The shortest repetition pattern in this (1, 7, 2, 3) RLL modulation rule is “010101...
. ”, And the longest repeating pattern is“ 010000 ”.
0000000000001 ... ".

Here, as shown in FIGS. 3A to 3E, the shortest repetition pattern is recorded with the corrected recording pulse (hereinafter referred to as a write pulse) having an appropriate pulse width. When the corresponding recording mark is formed on the magneto-optical disk 4, the amplitude of the reproduced signal is set to VA1, and the middle point (the intermediate value of the amplitude) of the envelope of the reproduced signal is set to CA1.

Further, as shown in FIGS. 4A to 4E, when the corrected write pulse has an appropriate pulse width,
When the longest repetitive pattern is recorded and a corresponding recording mark is formed on the magneto-optical disk 4, the amplitude of the reproduced signal is VB1, and the midpoint of the envelope of the reproduced signal is CB1.
And

As shown in FIGS. 5A to 5E, the shortest repetition pattern is recorded and the corresponding recording mark is recorded on the magneto-optical disk 4 in a state where the pulse width of the correction of the write pulse is too small. When formed, the amplitude of the reproduced signal is VA2, and the midpoint of the envelope of the reproduced signal is CA2.

As shown in FIGS. 6 (a) to 6 (e), the longest repetition pattern is recorded and the corresponding recording mark is recorded on the magneto-optical disk 4 with the pulse width of the correction of the write pulse being too small. When formed, the amplitude of the reproduced signal is VB2, and the midpoint of the envelope of the reproduced signal is CB2.

As shown in FIGS. 7A to 7E, the shortest repetition pattern is recorded and the corresponding recording mark is recorded on the magneto-optical disk 4 in a state where the correction of the write pulse is excessively large. When formed, the amplitude of the reproduced signal is VA3, and the midpoint of the envelope of the reproduced signal is CA3.

As shown in FIGS. 8 (a) to 8 (e), the longest repetitive pattern is recorded and the corresponding recording mark is recorded on the magneto-optical disk 4 in a state where the pulse width of the write pulse is excessively corrected. When formed, the amplitude of the reproduced signal is VB3, and the midpoint of the envelope of the reproduced signal is CB3.

Then, (VA1 / VB1), (VA2 /
When (VB2) and (VA3 / VB3) are calculated and the respective values are compared, the value of (VA1 / VB1) becomes the largest value. At the same time, CA1 = CB1, CA2 <C
The relationship of B2, CA3> CB3 holds.

From the above, the pulse width of the recording pulse is adjusted so that the quotient obtained by dividing the amplitude value of the reproduction signal of the shortest repetition pattern by the amplitude value of the reproduction signal of the longest repetition pattern becomes the largest value. By adjusting the correction amount, an optimal write pulse can be obtained.

The difference between the midpoint of the envelope of the reproduced signal having the shortest repetition pattern and the midpoint of the envelope of the reproduced signal having the longest repetition pattern is calculated, and the pulse of the recording pulse is set so that the difference falls within a predetermined range. By adjusting the width correction amount, an optimum write pulse can be obtained. Also, when the sign of the difference is positive, the correction state is excessively large, so that when the correction amount of the pulse width is reduced, the correction amount of the pulse width can be made closer to the optimum state.
When the sign of the difference is negative, the correction state is too small. Therefore, when the correction amount of the pulse width is increased, the correction amount of the pulse width can be made closer to the optimum state.

FIG. 9 shows a main part of a control system of the magneto-optical disk drive according to one embodiment of the present invention.

Referring to FIG.
Is for connecting the magneto-optical disk device to a host device (not shown) used as an external storage device, and exchanging recording / reproducing data and various control data between the host device and the control section 12. is there.

The control unit 12 controls the operation of each unit of the magneto-optical disk device and controls the exchange of data with the host device. The modulation circuit 13 converts the recording data S1 output from the control unit 12 into a predetermined modulation rule (for example, (1, 7, 2, 2,
3) RLL), and the output is applied to the write pulse correction circuit 14 as a recording pulse S2.

The write pulse correction circuit 14 includes a controller 12
This is for correcting the pulse width of the recording pulse S2 on the basis of the pulse width correction amount data SC added from the above, and its output is applied to the semiconductor laser drive controller 15 as a write pulse S3.

The semiconductor laser drive control section 15 outputs a recording current S4 modulated in response to the write pulse S3.
Of semiconductor laser devices.

Various light reception signals S5 detected by the detection optical system of the optical pickup device 5 are applied to a signal calculation section 16. The signal calculation unit 16 applies a predetermined calculation process to the light receiving signal S5 to obtain a predetermined reproduction signal S6, a tracking error signal S7, a focusing error signal S8, and
The sector address signal S9 is calculated. The reproduction signal S6 is applied to the waveform equalization circuit 17, the tracking error signal S7 is applied to the tracking servo control unit 18, and the focusing error signal S8 is applied to the focusing servo control unit 19. The sector address signal S9 is applied to the seek control unit 20.

The tracking servo controller 18 executes a tracking servo control for following a laser beam to a recording track of the magneto-optical disk 4, and moves the objective lens moving mechanism in a direction to bring the value of the tracking error signal S7 closer to zero. Of the tracking actuator 21 is controlled. Also, the tracking servo control unit 18
Various signals are exchanged with the control unit 12.

The focusing servo control section 19 executes focusing servo control for focusing a laser beam on a recording track of the magneto-optical disk 4, and moves the objective lens in a direction to bring the value of the focusing error signal S8 closer to zero. The operation of the focusing actuator 22 of the mechanism is controlled. Further, the focusing servo control unit 19 exchanges various signals with the control unit 12.

The seek control section 20 is for positioning the laser beam on the recording track specified by the control section 12, and determines a position error with respect to the specified recording track based on the sector address signal S9. , The seek motor 23 of the seek mechanism 6 in a direction to reduce the position error to zero.
Drive. The seek control unit 20 also notifies the control unit 12 that the seek operation has been completed.

The waveform equalizing circuit 17 forms a signal obtained by removing the influence of inter-waveform interference or the like from the reproduced signal S6, and outputs the corrected signal S10 as a corrected reproduced signal S10. It has been added to the digital converter 25.

The binarization circuit 24 binarizes the corrected reproduction signal S10, and outputs a binarized pulse S11 as a data discriminating demodulation circuit 27 and a PL signal.
It is added to the L circuit 28.

The PLL circuit 28 forms a clock signal S12 which is phase-synchronized with the binarized pulse S11.
7 has been added.

The data discriminating and demodulating circuit 27 samples the binarized pulse S11 in synchronization with the clock signal S12, reproduces data based on the sampling result, demodulates the reproduced data, and reproduces the reproduced data S13.
The reproduced data S13 is added to the control unit 12.

The analog / digital converter 25 converts the corrected reproduction signal S10 into a corresponding digital signal, and outputs the digital reproduction signal S14 as an upper peak value detector 29 and a lower peak value detector 30. Has been added to

The upper peak value detector 29 detects the peak value of an upwardly convex portion in one amplitude of the digital reproduction signal S14.
15, the amplitude value calculation unit 31 and the midpoint value calculation unit 32
Has been added to

The lower peak value detector 30 detects the peak value of a downwardly convex portion in one amplitude of the digital reproduction signal S14, and outputs the lower peak detection value S
16, an amplitude value calculator 31 and a midpoint value calculator 32
Has been added to

The amplitude value calculator 31 calculates the upper peak detection value S1
The amplitude value of the digital reproduction signal S14 is calculated based on 5 and the lower peak detection value S16, and the output is supplied to the control unit 12 as the amplitude detection value S17.

The midpoint value calculator 32 calculates the upper peak detection value S1
5 to calculate the midpoint level of the envelope of the digital reproduction signal S14 based on the lower peak detection value S16 and the output of the spindle motor control applied to the controller 12 as the midpoint detection value S18. Part 34
Controls the operation of the spindle motor 1.
The loading mechanism unit 35 is an electric system included in the loading mechanism, and detects, for example, a media sensor that detects that the magneto-optical disk 4 is mounted, and a state of various marks that are added to the disk cartridge. Is output from the loading mechanism 35 to the control unit 12. The temperature sensor 36 detects the temperature in the vicinity where the magneto-optical disk 4 is mounted, and the detected value is applied to the control unit 12.

With the above configuration, the control unit 12 detects that the magneto-optical disk 4 is mounted immediately after the power is turned on to the magneto-optical disk device, and the control unit 12 temporarily turns off the magneto-optical disk 4. When it is detected that the magneto-optical disk 4 has been mounted after being ejected, and when the temperature sensor 36
When it is detected that the detected value is within a temperature range in which the formation of a recording mark is affected, a write pulse correction process is executed to determine the characteristics of the magneto-optical disk 4 at that time and the semiconductor laser device. In accordance with the state, the optimum recording mark can be formed.

FIG. 10 shows an example of the write pulse correction process executed by the control unit 12 at this time.

In the figure, the inspection area CKz set in the magneto-optical disk 4 is sought (process 101), and a predetermined initial value is set to the value of the pulse width correction amount data SC (process 102).

In this state, the shortest repetition pattern data described above is recorded for a predetermined number of sectors (step 103), and then the above-described longest repetition pattern is recorded for a predetermined number of sectors (step 104).

Then, a data read operation is performed on the sector in which the shortest repeated pattern data is recorded, the value of the amplitude detection value S17 at that time is set in a variable VA (process 105), and the longest repeated pattern data is recorded. The data read operation is performed on the sector, and the value of the amplitude detection value S17 at that time is set in the variable VB (process 106).

Next, the value obtained by dividing the value of the variable VA by the value of the variable VB is set in the variable RV (step 10).
7) It is checked whether or not the value of the variable RV is equal to or more than a predetermined value Na (decision 108).

When the result of determination 108 is YES, the operation is terminated because the value of the pulse width correction amount data SC is in an appropriate state. Also, the result of decision 108 is N
When the value becomes O, since the value of the pulse width correction amount data SC is not in an appropriate state, the value of the pulse width correction amount data SC is changed by a predetermined value (step 109), and the above-described inspection operation is performed again. Then, the process returns to step 103.

FIG. 11 shows another example of the write pulse correction process executed by the control unit 12.

In the figure, the inspection area CKz set on the magneto-optical disk 4 is sought (process 201), and a predetermined initial value is set to the value of the pulse width correction amount data SC (process 202).

In this state, the shortest repetition pattern data described above is recorded for a predetermined number of sectors (step 203), and the longest repetition pattern is recorded for a predetermined number of sectors (step 204).

Then, a data read operation is performed on the sector in which the shortest repetition pattern data is recorded, the value of the midpoint detection value S18 at that time is set in a variable CA (process 205), and the longest repetition pattern data is recorded. A data read operation is performed on the sector thus set, and the value of the midpoint detection value S18 at that time is set in a variable CB (process 206).

Next, the value obtained by subtracting the value of the variable CB from the value of the variable CA is set in the variable ΔC (step 20).
7) It is checked whether the absolute value of the variable ΔC is equal to or smaller than a predetermined value Nb (decision 208). If the result of decision 208 is YES, the pulse width correction amount data SC
Since this value is in an appropriate state, this operation ends.

When the result of the judgment 208 is NO, it is checked whether or not the value of the variable ΔC has a positive sign (decision 209). If the result of the determination 209 is YES, the pulse width correction is excessively large, so that the value of the pulse width correction amount data SC is reduced by a predetermined one-step value (process 210), and the above-described processing is performed again. The process returns to step 203 to execute the inspection operation. If the result of determination 209 is NO, it means that the correction of the pulse width is too small, so that the value of the pulse width correction amount data SC is increased by a predetermined one step value (process 211), and again. The process returns to step 203 to execute the above-described inspection operation.

FIG. 12 shows still another example of the write pulse correction process executed by the control unit 12.

In the figure, the inspection area CKz set on the magneto-optical disk 4 is sought (process 301), and a predetermined initial value is set to the value of the pulse width correction amount data SC (process 302).

In this state, the shortest repetition pattern data described above is recorded for a predetermined number of sectors (step 303), and the longest repetition pattern is recorded for a predetermined number of sectors (step 304).

Then, the data read operation is performed on the sector in which the shortest repetition pattern data is recorded, and the value of the amplitude detection value S17 at that time is set in the variable VA, and the value of the middle point detection value S18 is set in the variable CA. Set (process 305). Next, a data read operation is performed on the sector in which the longest repeated pattern data is recorded, and the value of the amplitude detection value S17 at that time is set in a variable VB, and the value of the midpoint detection value S18 is set in a variable CB. (Process 306).

Next, the value obtained by dividing the value of the variable VA by the value of the variable VB is set in the variable RV (Step 30).
7), the value obtained by subtracting the value of the variable CB from the value of the variable CA is set to the variable ΔC (process 308).

Then, it is determined whether or not the value of the variable RV is equal to or more than a predetermined value Na (determination 309). Judgment 30
When the result of Step 9 is YES, it is checked whether or not the absolute value of the variable ΔC is equal to or smaller than a predetermined value Nb (decision 3).
10). If the result of determination 310 is YES, the operation is terminated because the value of pulse width correction amount data SC is in an appropriate state.

When the result of judgment 309 is NO or when the result of judgment 310 is NO,
It is checked whether the value of the variable ΔC has a positive sign (decision 311). When the result of the determination 311 is YES, the pulse width correction is excessive, so that the value of the pulse width correction amount data SC is reduced by a predetermined one step value (process 312), and the above-described processing is performed again. The process returns to step 303 to execute the inspection operation. Also, the result of decision 311 is N
When it becomes O, the pulse width correction is in an excessively small state, so the value of the pulse width correction amount data SC is increased by a predetermined one step value (process 313), and the above-described inspection operation is executed again. Therefore, the process returns to the process 303.

The inspection area CKz of the magneto-optical disk 4
Since a plurality of recording tracks are secured, it is preferable that after changing the value of the pulse width correction amount data SC, the inspection operation be performed on another recording track.

In the above-described embodiment, the adjustment operation of the pulse width correction value data SC is performed by using the shortest repetition pattern and the longest repetition pattern. However, this adjustment operation is performed during normal data recording (verify operation). ) Can be executed in parallel.

In the above-described embodiment, (1,7,
2, 3) Although the case where the RLL modulation rule is used has been described, the present invention can be similarly applied to the case where another modulation rule is used.

In the above-described embodiment, the case where the present invention is applied to a magneto-optical disk device has been described. However, the present invention is similarly applied to a phase-change type optical disk device and a write-once optical disk device. be able to.

In the above-described embodiment, the inspection area for inspecting the medium characteristics is provided in the recording area of the magneto-optical disk. However, even when this inspection area is not particularly provided, the present invention is similarly applied. be able to. In that case, a free area of the recording area may be appropriately used.

[0076]

As described above, according to the present invention,
In a control method of an optical recording apparatus that uses a replaceable optical recording medium as a recording medium and performs a data recording operation in a state where a pulse width of a recording pulse is corrected from a pulse width at the time of recording modulation during data recording. A first recording pattern having a short recording mark length in a predetermined area of the medium;
A second recording pattern having a long recording mark is recorded, and the first recording pattern and the second recording pattern are reproduced, respectively, and a middle point of an envelope of a reproduction signal of the first recording pattern is recorded. And a second midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the second recording pattern is detected, and the second midpoint value is detected from the first midpoint value. Since the correction value of the pulse width of the recording pulse is set so that the value of the difference obtained by subtracting the point value is equal to or less than a predetermined value, the length of the recording mark must be specified to a predetermined value. Thus, an effect that a data error or the like at the time of data reproduction can be suppressed can be obtained.

In addition, a control of an optical recording apparatus which uses a replaceable optical recording medium as a recording medium and performs a data recording operation in a state where a pulse width of a recording pulse is corrected from a pulse width at the time of recording modulation during data recording. In the method,
An initial setting process of setting a correction value of a recording pulse to a predetermined initial value; a first recording pattern having a short recording mark length in a predetermined area of the optical recording medium; and a second recording pattern having a long recording mark length.
Are recorded respectively, and the first recording pattern and the second recording pattern are respectively reproduced, and the first midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the first recording pattern is recorded. And a midpoint value inspection process for respectively detecting a second midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the second recording pattern, and the first midpoint obtained by the midpoint value inspection process. The midpoint value difference determination processing for determining that the absolute value of the difference obtained by subtracting the value from the second midpoint value is equal to or smaller than a predetermined value, and the difference in the midpoint value difference determination processing When the absolute value of is larger than a predetermined value,
After resetting the correction value of the recording pulse based on the sign of the difference, a control process of repeatedly executing the midpoint value inspection process is performed, so that the length of the recording mark is defined to a predetermined value. Thus, an effect that a data error or the like at the time of data reproduction can be suppressed can be obtained.

In addition, a control of an optical recording apparatus that uses a replaceable optical recording medium as a recording medium and performs a data recording operation in a state where the pulse width of a recording pulse is corrected from the pulse width at the time of recording modulation during data recording. In the method,
An initial setting process of setting a correction value of a recording pulse to a predetermined initial value; a first recording pattern having a short recording mark length in a predetermined area of the optical recording medium; and a second recording pattern having a long recording mark length.
Are recorded respectively, and the first recording pattern and the second recording pattern are respectively reproduced, and the first recording pattern corresponding to the amplitude of the reproduction signal of the first recording pattern is reproduced.
And a second amplitude value corresponding to the amplitude of the reproduced signal of the second recording pattern, respectively, and a first intermediate value corresponding to the midpoint of the envelope of the reproduced signal of the first recording pattern. An amplitude midpoint value inspection process for detecting a point value and a second midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the second recording pattern, respectively, and the second midpoint value inspection process obtained by the amplitude midpoint value inspection process. The quotient value obtained by dividing the amplitude value of 1 by the second amplitude value is obtained by an amplitude value ratio determination process for determining that the quotient value is equal to or more than a predetermined value, and the amplitude midpoint value inspection process. A midpoint value difference determination process for determining that an absolute value of a difference obtained by subtracting the first midpoint value from the second midpoint value is equal to or smaller than a predetermined value, and the amplitude value ratio In the determination process, it is determined that the value of the quotient is not equal to or more than a predetermined value, When it is determined that the absolute value of the difference is not smaller than or equal to a predetermined value in the midpoint value difference determination process, after the correction value of the recording pulse is reset based on the sign of the difference, Since the control processing for repeatedly executing the value inspection processing is performed, the length of the recording mark can be specified to a predetermined value, and the effect of suppressing a data error or the like during data reproduction can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating the configuration of a main part of a magneto-optical disk device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a format of a recording area of a magneto-optical disk.

FIG. 3 is a schematic diagram for explaining the principle of the present invention (when the pulse width correction amount is appropriate).

FIG. 4 is a schematic diagram for explaining the principle of the present invention (when the pulse width correction amount is appropriate).

FIG. 5 is a schematic diagram for explaining the principle of the present invention (when the pulse width correction amount is excessive).

FIG. 6 is a schematic diagram for explaining the principle of the present invention (when the pulse width correction amount is excessive).

FIG. 7 is a schematic diagram for explaining the principle of the present invention (when the correction amount of the pulse width is too small).

FIG. 8 is a schematic diagram for explaining the principle of the present invention (when the correction amount of the pulse width is too small).

FIG. 9 is a block diagram showing a main part of a control system of the magneto-optical disk drive according to one embodiment of the present invention.

FIG. 10 is a flowchart illustrating an example of a write pulse correction process executed by a control unit.

FIG. 11 is a flowchart illustrating another example of the write pulse correction process executed by the control unit.

FIG. 12 is a flowchart showing still another example of the write pulse correction process executed by the control unit.

FIG. 13 is an explanatory diagram for describing a mark edge recording method.

FIG. 14 is a schematic diagram for explaining inconvenience of the conventional device.

FIG. 15 is a schematic diagram for explaining inconvenience of the conventional device.

[Explanation of symbols]

 Reference Signs List 12 control unit 14 write pulse correction circuit 29 upper peak value detector 30 lower peak value detector 31 amplitude value calculator 32 midpoint value calculator 35 loading mechanism unit 36 temperature sensor

Claims (4)

[Claims] 1. A control method for an optical recording apparatus that uses an exchangeable optical recording medium as a recording medium and performs a data recording operation in a state where a pulse width of a recording pulse is corrected from a pulse width at the time of recording modulation during data recording. In the method, a first recording pattern having a short recording mark length and a second recording pattern having a long recording mark length are respectively recorded in a predetermined area of an optical recording medium, and the first recording pattern and the second recording pattern are recorded. 2 are respectively reproduced to correspond to the first midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the first recording pattern and the midpoint of the envelope of the reproduction signal of the second recording pattern. Detected second midpoint value,
A correction value of a pulse width of a recording pulse is set such that a difference value obtained by subtracting the second midpoint value from the first midpoint value is equal to or less than a predetermined value. Control method of optical recording device. 2. Control of an optical recording apparatus which uses an exchangeable optical recording medium as a recording medium and performs a data recording operation in a state where the pulse width of a recording pulse is corrected from the pulse width at the time of recording modulation during data recording. A method for setting a correction value of a recording pulse to a predetermined initial value, a first recording pattern having a short recording mark length in a predetermined area of the optical recording medium, and a first recording pattern having a long recording mark length. 2 is recorded, and the first recording pattern and the second recording pattern are reproduced, respectively, and a first midpoint corresponding to the midpoint of the envelope of the reproduction signal of the first recording pattern is recorded. A midpoint value inspection process for respectively detecting a value and a second midpoint value corresponding to the midpoint of the envelope of the reproduced signal of the second recording pattern; A midpoint value difference determination process for determining that an absolute value of a difference obtained by subtracting the first midpoint value from the second midpoint value is equal to or less than a predetermined value; When the absolute value of the difference is larger than a predetermined value in the processing, the resetting of the recording pulse correction value based on the sign of the difference is performed, and thereafter, the control processing of repeatedly executing the midpoint value inspection processing is performed. A method for controlling an optical recording device, which is characterized in that: 3. Control of an optical recording apparatus that uses a replaceable optical recording medium as a recording medium and performs a data recording operation in a state where the pulse width of a recording pulse is corrected from the pulse width at the time of recording modulation during data recording. A method for setting a correction value of a recording pulse to a predetermined initial value, a first recording pattern having a short recording mark length in a predetermined area of the optical recording medium, and a first recording pattern having a long recording mark length. 2 is recorded, the first recording pattern and the second recording pattern are respectively reproduced, and a first amplitude value corresponding to an amplitude of a reproduction signal of the first recording pattern and the first A second amplitude value corresponding to the amplitude of the reproduction signal of the second recording pattern, and a first midpoint corresponding to the midpoint of the envelope of the reproduction signal of the first recording pattern. And an amplitude midpoint value inspection process for respectively detecting a second midpoint value corresponding to the midpoint of the envelope of the reproduction signal of the second recording pattern, and the first midpoint value obtained by the amplitude midpoint value inspection process. An amplitude value ratio determination process for determining that the value of the quotient obtained by dividing the amplitude value by the second amplitude value is equal to or greater than a predetermined value, and the second process for obtaining the amplitude midpoint value inspection process. A midpoint value difference determination process for determining that the absolute value of the difference obtained by subtracting the first midpoint value from the second midpoint value is equal to or less than a predetermined value; and the amplitude value ratio determination process. When it is determined that the value of the quotient is not greater than or equal to a predetermined value, and the absolute value of the difference is not less than or equal to a predetermined value in the midpoint value difference determination process, the sign of the difference After resetting the correction value of the recording pulse based on the amplitude value inspection process Method of controlling an optical recording apparatus characterized by comprising a control process to be repeated. 4. The optical recording apparatus according to claim 1, wherein a series of processing started from the initial setting processing is executed immediately after the power of the apparatus is turned on. Control method.