JP3222934B2 - Recording pulse correction method in mark edge recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording pulse correction method in a mark edge recording system for an optical disk drive or a magneto-optical disk drive.

[0002]

2. Description of the Related Art In general, when data is written on an optical disk, a laser beam is irradiated onto an optical recording medium to apply heat, thereby making a hole in the medium, inverting the magnetization direction of the medium, or writing data on the medium. By changing the crystal state,
The data is recorded.

Here, as one of the recording methods of an optical disk, a code edge bit is made to correspond to each of a front edge and a rear edge of a recording mark so that the length of the recording mark carries information. There is. This recording method is suitable for high-density recording, but requires precise edge positions.

That is, when recording is performed by the mark edge recording method, due to the influence of the residual heat of the recording mark written immediately before,
Since the actual recording mark length is longer than the applied recording pulse or the heat accumulation by the laser light is insufficient near the leading edge, the mark shape may be irregular as shown in FIG. Therefore, the edge position is shifted from the ideal position,
Jitter increases, and in the worst case, it becomes impossible to reproduce the original data. Therefore, in the mark edge recording method, accurate edge position control is required.

In view of the above, as an edge position control method, the pulse width and power of the recording light pulse are adjusted according to the recording radius of the optical disk or by the density of the recording data pattern (that is, by the blank length immediately before). The correction is disclosed in JP-A-63-53722.

[0006]

However, when recording on a medium having a high thermal conductivity such as a magneto-optical disk, not only the influence of the heat of the recording mark to be written but also the recording mark immediately before writing is obtained. The position of the leading edge and the trailing edge of the recording mark is shifted due to the influence of the residual heat of the recording mark. That is, since the amount of residual heat accumulated on the optical disc differs depending on the difference between the immediately preceding mark length and the blank length, the amount of edge position shift changes depending on the recording data pattern.
For example, as shown in FIG. 18, even if the blank lengths are equal, as in the case of the data pattern a and the data pattern b, the amount of heat accumulated on the optical disc is different if the immediately preceding recording pulse length is different. Of the edge is different. Therefore, when recording on a magneto-optical disk, as in the conventional method, the correction amount of the pulse width and power of the recording pulse is set to be constant, or the correction amount is determined only by the immediately preceding blank length. Position control cannot be performed.

When correcting the irregularity of the mark shape as described above, the degree of non-uniformity of the mark shape differs depending on the recording data pattern for the same reason as described above. In the conventional method in which the value is set to a constant value or determined only by the immediately preceding blank length, the correction of the mark shape becomes incomplete.

[0008]

According to the first aspect of the present invention, information is recorded by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information . At this time , the initial value of the correction value of the pulse width and output timing of the recording pulse is written from the CPU to the memory, and the recording pulse according to the designated data is written and recorded on the optical recording medium in accordance with the correction value stored in the memory. The reproduced data is reproduced, the reproduced data is compared with the designated data, the correction value is varied until the data coincides, the data is written to the memory, and the recording and writing to the optical recording medium according to the correction value is performed. And the reproduction and comparison thereof are repeated to calculate and set the optimum value of the correction value.
Pulse correction method in mark edge recording method
After the playback data matches the designated data,
The phase of the raw data PLL is shifted by a predetermined amount and the
Playback data and compare this playback data with the specified data
The above correction value is applied again until these data match.
Writing to the memory, and optical recording according to the correction value.
Recording on the recording medium, playback / comparison, and after matching
By repeating the reproduction and comparison by shifting the phase,
Optimized values are calculated and set .

According to the second aspect of the present invention, when recording information by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information, a recording pulse is used. After writing the initial value of the correction value of the pulse width and output timing from the CPU to the memory, writing and recording the recording pulse according to the designated data on the optical recording medium according to the correction value stored in the memory, and then recording the recorded data. Reproducing, and calculating and setting the optimum value of the correction value from the reproduced data. In the recording pulse correction method in the mark edge recording method, the variation amount of the edge of the reproduction pulse signal from the reproduction clock is calculated. detected by the edge change amount detecting means, so as to calculate and set the optimum value of the correction value in accordance with the variation, the error
Using a plurality of discriminators for the
No specified amount of data discriminator window for discriminator
Multiple playbacks using the shifted window
From the result of verifying the raw pulse signal,
Detect fluctuations from the center of the data discrimination window
I did it.

According to the third aspect of the present invention, when information is recorded by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information, the recording data is recorded. When recording by correcting the pulse width and output timing of the recording pulse according to the pattern, the initial value of this correction value is written from the CPU to the memory, and the recording pulse according to the designated data is written in accordance with the correction value stored in the memory. A recording pulse correction method in a mark edge recording method, wherein the recorded data is reproduced after writing and recording on the optical recording medium, and the optimum value of the correction value is calculated and set from the reproduced data. In the above, the amount of fluctuation of the edge of the reproduction pulse signal from the reproduction clock according to the recording data pattern is detected by edge fluctuation amount detection means, To calculate and set the optimum value of the correction value in accordance with the amount of variation, the edge variation detector
Use a plurality of discriminators for the means,
Shifted by a predetermined amount as a window for data discrimination
Multiple reproduced pulse signals reproduced using a window
From the result of the verification check, the data
The amount of fluctuation from the center of Indiana was detected .

[0011] In the invention described in 請 Motomeko 4, the recording data
Data pattern judgment, the recording pulse length L ₀ of the write target
Based on the pulse length L ₀ and the immediately preceding recording pulse,
Based on the blank length L ₁ or the pulse length L ₀ ,
Based on the blank length L ₁ and the preceding recording pulse length L ₂
It was to be performed.

According to the fifth aspect of the present invention, on an optical recording medium
Irradiates a laser beam whose intensity has been modulated, and the length carries information.
Recording information by forming recording marks
Correction of the pulse width and output timing of the recording pulse
Write the initial value of the value from the CPU to the memory
The recording pulse by the correction value stored in the memory.
Therefore, after writing and recording on the optical recording medium, the recorded data is recorded.
Data is reproduced, and the optimum value of the correction value is obtained from the reproduced data.
The mark edge recording method that calculates and sets the
Of the read pulse signal in the write pulse correction method
Edge fluctuation detection
And the optimal value of the correction value is determined in accordance with the amount of variation.
To calculate and set the value, the use of a single discriminator edge change amount detecting means, after recording the data specified by the repeated data of the same pattern, sequentially a predetermined amount of data discriminating window during playback The data is reproduced while being shifted one by one, and the amount of fluctuation from the center of the data discrimination window is detected from the result of the verification check.

[0013] According to the invention of claim 6, on the optical recording medium
Irradiates a laser beam whose intensity has been modulated, and the length carries information.
Recording information by forming recording marks
At this time, the pulse of the recording pulse according to the recording data pattern
When recording with the width and output timing corrected,
Write the initial value of the correction value from the CPU to the memory, and
Correction of the recording pulse by the data stored in the memory.
After writing and recording on the optical recording medium according to the value,
The reproduced data is reproduced, and the maximum value of the correction value is obtained from the reproduced data.
Mark edge recording system that calculates and sets appropriate values
In the recording pulse correction method according to
The playback clock of the edge of the playback pulse signal according to the pattern
The amount of fluctuation from the edge is detected by edge fluctuation amount detection means,
The optimum value of the correction value is calculated and set in accordance with the variation amount.
To so that, the use of a single discriminator edge change amount detecting means, after recording the data specified by the repeated data of the same pattern, the data discriminating window sequentially reproduced while shifting by a predetermined amount at the time of reproduction The amount of change from the center of the data discrimination window is detected from the result of the verification check.

According to the invention described in claim 7, the recording data
Turn of the judgment, based on the recording pulse length L ₀ of the write target
There are, the pulse length L ₀ and the recording pulse immediately before the bra
On the basis of the link length L ₁ or the pulse length L ₀ ,
Based on the rank length L ₁ and the preceding recording pulse length L ₂
I did it.

[0015]

[0016]

According to the first aspect of the present invention, the optimum value is obtained by changing the correction value of the recording pulse until the reproduction data of the result of actually writing and recording based on the designated data matches the initial designated data. Has a learning function to calculate and set the appropriate edge position control that can handle differences in the type and characteristics of optical recording media, changes in the surrounding environment, or changes over time in the drive device and the media itself. to become. Also, after the playback data matches the specified data,
Further, the same is performed by shifting the phase of the reproduction system data PLL.
Comparison processing of playback data of recorded data with specified data
Is repeated until they match.
In the center of the generated data discrimination window,
It can also be corrected so that the leading and trailing edges of the recording pulse are located
Becomes possible, and the phase of the reproduction system data PLL fluctuates.
Can be reproduced without data error.
You .

According to the second aspect of the present invention, the amount of fluctuation of the edge of the reproduction pulse signal from the reproduction clock is detected by the edge fluctuation amount detection means, and the optimum value of the correction value is calculated and set according to the fluctuation amount. So, for example, a playback system PLL
The center of the window created by the data can be fine adjusted so that the edge is located in the reproduced pulse signal, d
Using a plurality of discriminators for the
No specified amount of data discriminator window for discriminator
Multiple playbacks using the shifted window
From the result of verifying the raw pulse signal,
To detect the amount of fluctuation from the center of the discrimination window.
With simple configuration, it is possible to detect the edge fluctuation amount of the reproduction pulse signal
That Do and is possible.

According to the third aspect of the present invention, the amount of change in the edge of the reproduction pulse signal from the reproduction clock corresponding to the recording data pattern is detected by edge fluctuation amount detection means, and the correction value is determined in accordance with the fluctuation amount. Calculate the optimal value of
Since the setting is performed, for example, fine adjustment can be performed so that the edge of the reproduction pulse signal is located at the center of the window created by the reproduction system PLL data , and the edge change is performed.
Using a plurality of discriminators for the momentum detection means, these discriminators
A predetermined amount as a data discrimination window for
Pallets reproduced using the window
Data discrimination based on the result of verifying the
Easy to detect the amount of fluctuation from the center of the window
With the simple configuration, it is possible to detect the edge fluctuation amount of the reproduction pulse signal.
That Do not.

According to a fourth aspect of the present invention, the recording data
Data pattern judgment, the recording pulse length L ₀ of the write target
Based on the pulse length L ₀ and the blur immediately before this recording pulse,
Based on the link length L _1, or the pulse length L _0, blank length L
Carried out based on a ₁ and the preceding recording pulse length L ₂
Therefore, differences in the type of optical recording medium, changes in the surrounding environment,
Or, other than the aging of the drive device and the medium itself,
The correction takes into account the data pattern as well, and
Ledge position control becomes possible .

In the invention according to claim 5, the recycled pallet
The amount of fluctuation of the edge of the
It is detected by the moving amount detecting means, and the correction value is
Is calculated and set, for example, the reproduction system PLL
Playback pulse at center of window created by data
Fine adjustment can be made so that the edge of the signal is located, and a plurality of discriminators are used for the edge fluctuation amount detecting means, and data is reproduced using a window shifted by a predetermined amount as a data discrimination window for these discriminators. Since the fluctuation amount from the center of the data discrimination window is detected from the result of the verify check of the plurality of reproduction pulse signals, the edge fluctuation amount of the reproduction pulse signal can be detected with a simple configuration.

According to a sixth aspect of the present invention, the recording
Reproduction of the edge of the reproduction pulse signal according to the data pattern
The variation from the clock is detected by the edge variation detection means.
Calculation of the optimum value of the correction value in accordance with the variation amount.
Because it is set, for example, the reproduction system PLL data
At the center of the window created by
The edge can be fine-tuned so that the edge is located. One discriminator is used as the edge variation detecting means, and the designated data based on the repetitive data of the same pattern is recorded. Playback is performed while shifting, and from the result of the verification check, the amount of fluctuation from the center of the data discrimination window is detected.
It is possible to detect the edge fluctuation amount of the reproduction pulse signal with an extremely small circuit scale.

According to the seventh aspect of the present invention, the recording data
Data pattern judgment, the recording pulse length L ₀ of the write target
Based on the pulse length L ₀ and the blur immediately before this recording pulse,
Based on the link length L ₁ or the pulse length L ₀ , the blank length
L ₁ and the previous to make on the basis of the recording pulse length L ₂
The optical recording media type and the surrounding environment.
In addition to the change of the drive device and the medium itself over time,
The correction takes into account the recording data pattern, making it more accurate
Edge position control becomes possible.

[0023]

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the optimum value of the correction value of the recording pulse is calculated by the learning function by adapting to the type and characteristics of the optical recording medium and the change in the surrounding environment, and also to the aging of the drive device or the medium itself. By setting and correcting the output timing of the recording pulse, the pulse width, and the recording power at the rising portion of the recording pulse based on such a correction value, the edge position of the recording mark can be controlled with high accuracy. It was made.

For example, when recording data is written by the mark edge recording method, the data is written in NRZI code (Non Re
Turn to Zero Inverted code), and record it without any correction, as described above,
The recording mark is written longer than the ideal state (also shown as an actual recording mark in the upper part of FIG. 2). Therefore, in the present embodiment, the pulse width and the output timing of such a recording pulse are corrected by a correction value, and by using the corrected recording pulse, control is performed so that the edge position of the recording mark comes to an ideal position. It is basically to do.

When the irregularity of the recording mark shape is remarkable depending on the type of the optical recording medium as described above, as shown in FIG. 3, not only the pulse width and output timing of the recording pulse but also the rising portion of the recording pulse is used. By correcting the recording power and the length at which the recording power is changed, the edge position and mark shape of the recording mark are also corrected.

As a correction value for performing such a recording pulse correction, a recording pulse correction value suitable for various conditions of the optical recording medium at that time may be used. Thus, in the present embodiment, the calculation and setting of the optimum value of the recording pulse correction value for this purpose are performed by the learning operation of the algorithm shown in FIG.

First, the initial value of the correction value of the recording pulse is set to CP
Write from U to RAM (memory). Then, predetermined designated data is written and recorded on an optical recording medium (disk). At this time, the recording pulse of the designated data is corrected based on the correction value read from the RAM, and the write pulse is recorded. Thereafter, the recorded data is reproduced from the disc, and the reproduced data is compared with the specified data. As a result of the comparison, if the two data match, it is determined that the correction value is appropriate, and the learning operation ends. On the other hand, if the comparison results do not match, RA
The value of the correction value read from M
After writing to the disk, the recording pulse of the specified data is corrected based on the changed correction value, and the data is written and recorded on the disk. The recorded data is reproduced, and the reproduced data is compared with the specified data. This process is repeated until the two data match, and the correction value at the time of the match is stored in the RAM as a correction value optimal for the condition of the disk at that time.

As the specific correction value data, the leading edge output timing, the trailing edge output timing, etc. of the recording pulse may be used (the pulse width is determined by these two output timings). Further, if a correction value of the recording power at the rising portion of the recording pulse and a correction value of a length for changing the recording power are also stored, the shape of the recording mark can be corrected.

A mark edge recording apparatus having such a learning function may be configured as shown in FIG. 4, for example. First, a controller 1 including a CPU and the like is provided, and a RAM (memory) 2 is connected to the controller 1, and a writing system 4 for an optical disk (optical recording medium) 3 and a reproduction system 5 are connected to the controller 1. . The RAM 2 is connected to a selector 6 for switching and controlling the write / read operation. The writing system 4 includes a modulator 7 for converting designated data from the controller 1 into a modulation code, a recording pulse correction unit 8 for correcting the modulation code based on a correction value read from the RAM 2, and a corrected recording. A laser drive circuit 9 driven based on a pulse is used to write data on the optical disk 3 through an optical pickup 10.

On the other hand, in the reproducing system 5, a reproducing amplifier 11, a waveform equalizer 12 for amplifying a detection signal detected from the optical disk 3 by the optical pickup 10 and shaping the waveform, and a binarizing circuit 13 for performing binarization processing are provided. Provided, discriminator & demodulator 1
4, and is reproduced as reproduction data. Here, reproduction system data PLL (Phase Locked Loop) 15 is provided in parallel with the discriminator & demodulator 14, and a synchronization signal is provided to the discriminator & demodulator 14.

In such a configuration, first, the initial value of the correction value of the recording pulse is
Write it to AM2 in advance. Here, when writing the initial value of the correction value or the correction value changed as described later to this RAM 2, the RAM 2 is set to the write state by the select signal from the controller 1, and the correction value data is written to the RAM 2. At other times, the read state is set so that the correction value can be read out from the RAM 2 to the recording pulse correction means 8 and output at any time.

Next, predetermined designated data is transferred to the optical disk 3
Write and record in. The designated data is transmitted from the controller 1 and is converted by the modulator 7 into a modulation code. As a modulation method, any method may be used, for example, a (2,7) RLL code (Run Length Limited code), a (1,7) RLL code, and the like. The modulated data thus modulated is recorded by the recording pulse correcting means 8.
It is converted to a corrected recording pulse. Here, the correction value of the recording pulse is read from the RAM 2, and the pulse width of the recording pulse, the output timing, the recording power of the rising portion, and the like are corrected. By outputting the corrected recording pulse to the laser drive circuit 9, the laser is turned on and off,
A recording mark is written and formed on the optical disk 3 through the optical pickup 10, and recording is performed.

After the writing and recording of the specified data, the reproduced data is reproduced by the reproducing system 5. The reproducing system 5 has the same configuration as the reproducing system of a normal drive device. First, a signal detected by the optical pickup 10 is amplified by a reproducing amplifier 11, waveform-shaped by a waveform equalizer 12, The signal is binarized by the conversion circuit 13. The binarized reproduction pulse signal is transmitted to the discriminator & demodulator 14 and reproduction system data P
LL15, and synchronizes a synchronization signal synchronized with the basic period of the reproduction pulse signal from the reproduction system data PLL15 with the discriminator &
By providing the signal to the demodulator 14, it is detected whether or not there is a reproduction pulse signal in the data discrimination window created by the synchronization signal, and demodulated as reproduction data. The demodulated reproduced data is sent to the controller 1 and used for comparison with designated data. As a result of this comparison, if the two data match, the learning operation ends. If the two data do not match, the correction value data is changed and rewritten into the RAM 2 by the CPU in the controller 1 until the reproduced data has no error (designation). The above-described learning operation is repeated until data matches.

The actual data recording may be performed in the same manner as when the designated data is recorded.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, similar to the above embodiment, the operation of learning the correction value is repeated until the reproduction data matches the designated data, but in addition to this,
After the data coincidence, the comparison between the reproduction data obtained by reproducing the recording data by shifting the phase of the reproduction system data PLL 15 and the designated data and the designated data is repeated until both data coincide, and the learning operation of the correction value is performed more completely. It was made.

FIG. 5 shows an algorithm of such a learning operation. After matching of both data by the operation of the embodiment (verify check OK), first, the reproduction system data PL is obtained.
The data recorded on the optical disk 3 is reproduced by appropriately shifting the phase of L15. The reproduction data is compared with the designated data, and if they match, the learning operation is terminated.
Write to 2. Then, the above operation is performed again, and the above operation is repeated until the reproduction data obtained by shifting the phase of the reproduction system data PLL 15 matches the designated data, and the correction value at the time of the coincidence is stored and set in the RAM 2 as an optimum value. .

In order to achieve this embodiment, no significant change is required in the configuration, and as shown in FIG.
The controller 1 may transmit a PLL phase control signal to the L15 after the learning according to the above embodiment is completed so that the phase can be shifted.

Here, the effect of this embodiment will be described with reference to a timing chart shown in FIG. FIG.
In the illustrated example, if the edge of the reproduction pulse signal is not near the center of the data discrimination window generated based on the synchronization signal of the reproduction system data PLL 15 as shown in the portion A, the window is shifted forward and backward. If the shift is performed, an error occurs in the reproduced data. Therefore,
In this embodiment, the phase of the reproduction system data PLL 15 is shifted,
A correction value of a recording pulse which does not cause a data error as shown in a portion B even if the window is shifted back and forth is determined and stored as an optimum value. In the illustrated example, the window is opened only when the reproduction pulse signal is 1 in order to simplify the description.

Further, a third embodiment of the present invention will be described with reference to FIG. The present embodiment is designed to cope with a case where the deviation amount of the edge position differs depending on the recording data pattern. The recording pulse is corrected by setting a correction value corresponding to the recording data pattern, and the edge position and the mark are corrected. The configuration is such that the shape can be accurately controlled.

First, designated data (or actual data)
At the time of writing, the data pattern identifying means 16 for identifying the data pattern of the modulated data modulated by the modulator 7
Is provided. Referring to FIGS. 2 and 3, the data pattern identification means 16 determines the recording pulse length L ₀ to be actually written, the blank length L ₁ immediately before the recording pulse, and the immediately preceding recording pulse length L ₂ . Each is calculated. These length information L ₀ , L ₁ and L ₂ are stored in the RAM.
2 is input, the output of the RAM 2 is set to be a correction value of the recording pulse corresponding to the recording data pattern, and is provided to the recording pulse correcting means 8. Here, a selector 17 is interposed on the address input side of the RAM 2 in order to provide the initial address information from the controller 1 to the RAM 2. That is, when writing the initial value of the correction value or the variable correction value to the RAM 2, the RAM 2 is written to the write state via the selectors 6 and 17 by the select signal from the controller 1, and the correction value data information is written to the RAM 2. In other cases, the read state is set, and the length information L ₀ , L ₁ and L ₂ are stored in the RAM 2.
And sends the output of the RAM 2 at that address to the recording pulse correction means 8 as a correction value of the recording pulse corresponding to the recording data pattern.

A fourth embodiment of the present invention will be described with reference to FIG. In this embodiment, the configuration of the recording pulse correction unit 8 is improved, and the delay unit 2 including the delay element 18 and the selector 19 is used.
0 and a toggle flip-flop 21 are connected in cascade, and the operation is controlled using the correction value of the recording pulse from the RAM 2 as a select signal.

First, in the modulation data, a leading edge pulse for determining the rising edge of the recording pulse and a trailing edge pulse for determining the falling edge are alternately arranged. , And its output becomes a recording pulse. Therefore, when recording the designated data (or actual data), the correction value data obtained from the RAM 2 is used as a select signal,
Each pulse is delayed by the delay element 18 and input to the selector 19, and one of them is selected. By the way,
To shorten the recording pulse width, it is necessary to advance the trailing edge pulse. However, since there is no element that actually advances the pulse, here, the modulation data is received only a predetermined time before the leading edge and the trailing edge. Each pulse is delayed. When the pulse train delayed based on the correction value data is input to the toggle flip-flop 21, the output of the toggle flip-flop 21 becomes a recording pulse corrected according to the recording data pattern.

A fifth embodiment of the present invention will be described with reference to FIG. In the recording pulse correcting means 8 of this embodiment, first, a demultiplexer 22 is provided as a pulse train separating means for separating the input modulated data into a front edge pulse for determining the rising edge of the recording pulse and a rear edge pulse for determining the falling edge. Have been. This demultiplexer 22
In the subsequent stage, a delay element 24 and a selector 25 are provided as delay means 23 for a front edge pulse, and a delay element 27 and a selector 28 are provided as delay means 26 for a rear edge pulse. The leading edge pulse delay data select signal in the correction value data of the RAM 2 is supplied to the selector 25, and one of the leading edge pulses delayed by the delay element 24 is selected by the selector 25. Similarly, a trailing edge pulse delay data select signal in the correction value data of the RAM 2 is applied to the selector 28, and one of the trailing edge pulses delayed by the delay element 27 is selected by the selector 28. ing. An SR flip-flop 29 is provided as a generation unit that uses the output of the selector 25 as a set signal and the output of the selector 28 as a reset signal. Therefore, this SR flip-flop 2
The output of 9 is a recording pulse corrected according to the recording data pattern.

According to the present embodiment, since the delay processing and the generation processing of the recording pulse of the NRZI code are performed separately for the front edge pulse and the rear edge pulse, high speed recording can be dealt with.

A sixth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the initial value of the correction value of the recording pulse as described above is stored in advance in the designated area of the optical disc 3, and the initial value of the correction value data read from this designated area is written in the RAM 2. The learning operation as described above is performed. The designated area of the optical disc 3 is, for example, SFP (Standard Formate).
d Part) is used.

According to this embodiment, since the correction value suitable for each optical disk 3 is held as the initial value, the time for the learning operation on the optical disk 3 can be shortened.

Further, if the optimum value of the correction value obtained by the learning operation is recorded instead of the initial value recorded in the designated area at that time, and this is used as the initial value of the next learning operation, Can be further reduced in the learning operation time at the time of recording.

Further, a seventh embodiment of the present invention will be described with reference to FIGS. In this embodiment, the data pattern of the modulated data modulated by the modulator 7 when the designated data (or the actual data) is written as shown in FIG. as a recording pulse length L to be Komimo actually writing now _0, the recording pulse immediately preceding blank length L ₁ and the preceding recording pulse length L ₂
Is calculated by the data pattern identification means 16.

FIG. 1 shows the algorithm of the learning operation of this embodiment.
This will be described with reference to FIG. First, the initial value of the correction value data of the recording pulse is written from the CPU to the RAM 2. Then, the specified data is recorded on the optical disc 3. At this time, the recording pulse length L _{0 to be written} , the blank length L ₁ immediately before the recording pulse, and the immediately preceding recording pulse length L ₂ are calculated in the same manner as described above. ₀ ,
A correction value corresponding to the values of L ₁ and L ₂ is set from the RAM 2, and the recording pulse is corrected based on the correction value and recorded on the optical disc 3. Thereafter, the recorded designated data is reproduced, and a difference (variation amount) between the edge of the obtained reproduced pulse signal and the center of the data discrimination window is detected. If this difference is within a predetermined value, the learning operation is terminated (corresponding to the processing of the above-described embodiment), but if the difference is larger than the predetermined value, the correction value data corresponds to this difference. Is changed, and the data is written into the RAM 2 again. At the same time, a verify check is performed to determine whether or not the reproduction data and the specified data match. If the edge position shift is large and a data error has occurred, the correction value data is further changed by changing the correction value data. Write to RAM2 again. The above operation is repeated until the edge of the reproduction pulse signal is substantially at the center of the data discrimination window, and the optimum correction value of the recording pulse is calculated and set.

By such a learning operation, the optimum value of the recording pulse on the optical disk 3 under the condition at that time is written in the RAM 2. Then, the recording pulse is corrected by using the optimum correction value and the data is recorded, so that it is possible to cope with the difference in the type and characteristics of the optical disk 3, the change of the surrounding environment, or the aging of the drive or the disk. In this case, accurate edge position control suitable for various conditions can be performed.

First, the initial value of the correction value of the recording pulse is first written into the RAM 2, and the designated data is recorded on the optical disk 3 without correction, and is reproduced to reproduce the edge of the reproduction pulse signal and the data discrimination window. The difference (variation) from the center is detected, and the amount corresponding to the difference is calculated as the optimum correction value.
You may make it set. Then, even when the initial value of the correction value is unknown, the optimum correction value is obtained by the above-described learning operation, and it is not necessary to store the initial value of the correction value in the controller 1.

A mark edge recording device having such a learning function may be configured as shown in FIG. 13, for example. That is, in addition to the configuration shown in FIG. 4 (or FIG. 6) and FIG. 8, on the reproduction system 5 side, there is an edge of the reproduction pulse signal in the data discrimination window created based on the synchronization signal from the reproduction system data PLL15. Discriminator 14a for detecting whether or not there is no discriminator & demodulator 14
4a and the demodulator 14b) (shown separately) and is provided with an edge variation detecting means 30 so that the detected edge variation data is taken into the CPU in the controller 1.

In such a configuration, the processing of the writing system 4 is performed in the same manner as in the above-described embodiment. On the other hand, the operation of the reproducing system 5 will be described with reference to FIG. As shown in FIG. 14, if the edge position shift of the written recording mark is large, the edge of the reproduction pulse signal also shifts greatly, deviates from the data discrimination window, and a data error may occur. If the edge of the reproduction pulse signal is not near the center of the data discrimination window, a data error may occur when the window fluctuates back and forth. Therefore, in the present embodiment, the difference between the edge of the reproduction pulse signal and the center of the data discrimination window, that is, the amount of edge fluctuation of the reproduction pulse signal, is detected by the edge fluctuation amount detecting means 30 and stored in the RAM 2 at that time. Is added or subtracted from the correction value by the amount corresponding to the difference, and this is set as the optimum correction value.
Write to RAM2 again. By performing the above operations,
The optimum correction value of the recording pulse can be calculated and set so that the edge of the reproduction pulse signal is located at the center of the data discrimination window so that no data error occurs even when the data discrimination window fluctuates back and forth. In addition,
In the example shown in FIG. 14, for simplicity, a case where the window is opened only when the reproduction data is “1” is shown.

When data is actually recorded on the optical disk 3, a correction value corresponding to the data pattern of the recording data is set from the RAM 2 in the same manner as when recording the designated data, and the recording pulse is corrected and recorded accordingly. What should I do?

In FIG. 13, if the edge variation detecting means 30 is constituted by a phase comparator, it is possible to detect the edge variation of the reproduced pulse signal with high accuracy by using a very simple configuration.

An eighth embodiment of the present invention will be described with reference to FIGS. This embodiment, demodulator provided in correspondence with the edge variation amount detecting means 31 to a plurality of discriminator 14a ₁ to 14A _n and the respective discriminator 14a ₁ to 14A _n 14
By a b ₁ ~14b _n is obtained by configuration. Play Thereby, each discriminating the reproduced pulse signal using these discriminator 14a ₁ to 14A _n plurality of data discriminating window 1~n of shifting by a predetermined amount as data discriminating window, by demodulating them It is possible to detect how much the edge of the reproduced pulse signal deviates from the center of the original window 1 from the result of verifying the data 1 to n.

In the example shown in FIG. 16, no error occurs in the reproduced data discriminated in the windows 1 and 2, but an error occurs in the reproduced data discriminated in the windows 3 to n.
As a result, it is found that the edge of the reproduction pulse signal is located in the area 2 within the original window 1. Therefore, the difference between the edge of the reproduction pulse signal and the center of the window 1 can be detected. The actual reproduced data includes the discriminator 14a ₁
And reproduced data 1 is used which is obtained through the demodulator 14b _1.

When the designated data is recorded in the learning operation, the designated data is recorded by repeating data of the same pattern, and the discrimination window is discriminated by one discriminator during reproduction by sequentially shifting the data discrimination window by a predetermined amount. From the result of verifying the reproduction data, it may be detected how much the edge of the reproduction pulse signal is shifted from the center of the original data discrimination window 1. FIG.
Referring to the above, the reproduction pulse signal of the same pattern repeated a plurality of times is reproduced while sequentially changing the data discrimination window from 1 to n, and it is determined in which area in the original window 1 the edge of the reproduction pulse signal is. Find out. Thereby, the difference between the edge of the reproduction pulse signal and the center of the window 1 is detected.

Note that, even in the method taking into account the edge variation shown in the seventh to eighth embodiments, the time of the learning operation may be reduced by the method shown in FIG. That is, the initial value of the correction value of the recording pulse is stored in the designated area of the optical disk 3 in advance, and the initial value of the correction value data read from this designated area is written in the RAM 2 so that the learning operation as described above is performed. Is performed. Moreover,
The optimum value of the correction value obtained by the learning operation is recorded instead of the initial value recorded in the designated area at that time, and this is set as the initial value of the next learning operation. The time can be further reduced.

In each of these embodiments, the designated data may be random data of a modulation code to be used.

If the above-described learning operation is performed at power-on, before data recording, or when the drive device is idle, other operations of the drive device will not be hindered.

[0063]

According to the first aspect of the present invention, in the mark edge recording system, a pulse width of a recording pulse and an initial value of a correction value of an output timing are written from a CPU to a memory, and a recording pulse based on designated data is written into the memory. After writing and recording on the optical recording medium according to the correction value stored in the optical recording medium, the recorded data is reproduced, the reproduced data is compared with the specified data, and the correction value is changed until these data match. The writing to the memory, the writing and recording to the optical recording medium according to the correction value and the reproduction and comparison thereof are repeated, and a learning function is provided to calculate and set the optimum value of the correction value. Appropriate edge position control that can cope with differences in the type and characteristics of optical recording media at the time, as well as changes in the surrounding environment or changes over time in the drive device and the media itself. It can be carried out. Also, the playback data
After the data and the specified data match, the reproduction system data PLL
The recorded data is reproduced again with the phase shifted by a predetermined amount.
Compare the raw data with the specified data and
The correction value is varied again until the
To the optical recording medium according to the correction value
Recording, its reproduction / comparison, and replay by phase shift after matching
Calculate and set the optimal value of the correction value by repeating raw and comparison
Has a learning function to make the playback system data PLL
Window center for discrimination of data generated by
Is corrected so that the leading and trailing edges of the recording pulse are located
And the phase of the reproduction system data PLL
Can be reproduced without data errors even if
To the extent possible, more appropriate edge position control is possible.
You .

According to the second aspect of the present invention, the amount of variation of the edge of the reproduced pulse signal from the reproduced clock is detected by the edge variation amount detecting means, and the optimum value of the correction value is calculated and set according to the variation amount. to so, for example, it can be fine adjusted so as to position an edge of the reproduced pulse signal in the center of the window created by the reproduction system PLL data, edge
Using a plurality of discriminators for the fluctuation amount detection means,
Predetermined amount for data discrimination window for separate device
Multiple playbacks played using shifted windows
From the result of verifying the pulse signal, the data
Since the fluctuation amount from the center of the discrimination window is detected,
Detects edge fluctuation of reproduced pulse signal with simple configuration
Ability and ing.

According to the third aspect of the present invention, the amount of fluctuation of the edge of the reproduction pulse signal from the reproduction clock corresponding to the recording data pattern is detected by the edge fluctuation amount detecting means, and the correction is performed according to the fluctuation amount. Since the optimum value of the value is calculated and set, for example, fine adjustment can be performed so that the edge of the reproduction pulse signal is located at the center of the window created by the reproduction system PLL data , and the edge variation
Using a plurality of discriminators for the quantity detection means,
Shift by a predetermined amount as a data discrimination window for
Multiple reproduced pulses reproduced using the window
For data discrimination based on the result of signal verification check
Since the amount of fluctuation from the center of the window is detected,
With this configuration, it is possible to detect the edge fluctuation amount of the reproduction pulse signal .

[0066] According to the invention of 請 Motomeko 4, recorded data
Determination of the pattern is based on a recording pulse length L ₀ of the write target
Then, the pulse length L ₀ and the blank immediately before this recording pulse
Based on the click length L _1, or the pulse length L _0, the blank length L ₁
And based on the previous recording pulse length L ₂
Therefore, differences in the type of optical recording medium, changes in the surrounding environment,
Or, other than the aging of the drive device and the medium itself,
The correction takes into account the data pattern as well, and
Ledge position control becomes possible .

According to the fifth aspect of the present invention, the reproduction pulse
Edge variation of the amount of signal edge variation from the recovered clock
Detected by the amount detection means, and the correction value
Since the optimum value is calculated and set, for example,
The playback pulse signal in the center of the window created by the
Fine adjustment can be made so that the edge of the signal is located, and one discriminator is used for the edge variation detection means, and the same pattern is used.
After recording the specified data by repeating the
The data discrimination window is sequentially shifted by a predetermined amount.
Then, the amount of fluctuation from the center of the data discrimination window is detected from the result of the verification check , so that the edge fluctuation of the reproduced pulse signal can be detected with an extremely small circuit scale .

According to the sixth aspect of the present invention, the recording data
Edge of the playback pulse signal according to the data pattern.
Detection of fluctuation from lock by edge fluctuation detection
Then, the optimum value of the correction value is calculated and set according to the amount of the fluctuation.
Because, for example, the playback system PLL data
In the center of the window created by
The edge discriminator can be fine-tuned so that one discriminator is used as the edge fluctuation amount detecting means, and the designated data based on the repetitive data of the same pattern is recorded. Reproduction is performed while shifting each time, and the amount of fluctuation from the center of the data discrimination window is detected based on the result of the verification check, so that the amount of edge fluctuation of the reproduction pulse signal can be detected with an extremely small circuit scale.

According to the seventh aspect of the present invention, the recording data
Determination of the pattern is based on a recording pulse length L ₀ of the write target
Zui, the pulse length L ₀ and the recording pulse immediately preceding Blanc
Based on the click length _{L 1,} or the pulse length _{L 0,} blank length L
As it performed based on _one and the preceding recording pulse length L ₂
Therefore, differences in the type of optical recording medium and changes in the surrounding environment
In addition to the change of the drive device and the medium itself over time,
The correction takes into account the recording data pattern, making it more accurate
Edge position control becomes possible.

[0070]

[Brief description of the drawings]

FIG. 1 is a flowchart showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a recording pulse correction method.

FIG. 3 is an explanatory diagram showing another example of a recording pulse correction method.

FIG. 4 is a block diagram.

FIG. 5 is a flowchart showing a second embodiment of the present invention.

FIG. 6 is a block diagram.

FIG. 7 is a timing chart for explaining the operation.

FIG. 8 is a block diagram showing a third embodiment of the present invention.

FIG. 9 is a block diagram showing a fourth embodiment of the present invention.

FIG. 10 is a block diagram showing a fifth embodiment of the present invention.

FIG. 11 is a flowchart showing a sixth embodiment of the present invention.

FIG. 12 is a flowchart showing a seventh embodiment of the present invention.

FIG. 13 is a block diagram showing the configuration.

FIG. 14 is a timing chart for explaining the operation.

FIG. 15 is a block diagram showing an eighth embodiment of the present invention.

FIG. 16 is a timing chart for explaining the operation.

FIG. 17 is an explanatory diagram showing an irregular shape of a recording mark according to a conventional method.

FIG. 18 is an explanatory diagram showing an edge position shift according to a conventional method.

[Explanation of symbols]

2 memory 3 optical recording medium 14a ₁ to 14A _n discriminator 16 recording data pattern identification unit 20 delay unit 22 the pulse train separation means 23 delay means 26 delay means 30 and 31 the edge change amount detecting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 11/105

Claims (7)

(57) [Claims] When recording information by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information, the recording pulse width and output timing of the recording pulse are adjusted. The initial value of the correction value is written from the CPU to the memory, and the recording pulse according to the designated data is written and recorded on the optical recording medium according to the correction value stored in the memory, and then the recorded data is reproduced. The data is compared with the designated data, the correction value is varied until the data match, writing to the memory, writing and recording to an optical recording medium according to the correction value, and reproduction / comparison thereof are repeated, and the correction is performed. Calculate the optimal value of the value
In the recording pulse correction method according to the mark edge recording method, the recorded data is reproduced again by shifting the phase of the reproduction system data PLL by a predetermined amount after the reproduction data matches the designated data. The data is compared with designated data, the correction value is changed again until the data match, writing to the memory, writing and recording on an optical recording medium according to the correction value, reproduction / comparison, and phase after matching A recording pulse correction method in a mark edge recording method, wherein reproduction / comparison by shifting is repeated to calculate and set an optimum value of the correction value. 2. A method for recording information by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries information, the recording pulse width and output timing of a recording pulse. The initial value of the correction value is written from the CPU to the memory, and a recording pulse according to the designated data is written and recorded on the optical recording medium according to the correction value stored in the memory, and then the recorded data is reproduced. In the recording pulse correction method in the mark edge recording method, wherein the optimum value of the correction value is calculated and set, the amount of change in the edge of the reproduction pulse signal from the reproduction clock is detected by edge fluctuation amount detection means. Then, an optimal value of the correction value is calculated and set according to the amount of variation , and
Using a plurality of discriminators for the edge variation detection means,
Volume as a data discriminator window for differentiators
Multiple playbacks using windows shifted by
From the result of verifying the playback pulse signal,
The amount of fluctuation from the center of the data discrimination window
Recording pulse correction method in the mark edge recording method, characterized in that the so that. 3. When recording information by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information, a recording pulse is generated in accordance with a recording data pattern. When recording after correcting the pulse width and output timing, the initial value of the correction value is written from the CPU to the memory, and a recording pulse according to the designated data is written and recorded on the optical recording medium in accordance with the correction value stored in the memory. After that, the recorded data is reproduced, and in the recording pulse correction method in the mark edge recording method, the optimum value of the correction value is calculated and set from the reproduced data. The amount of variation of the edge of the reproduced pulse signal from the reproduced clock is detected by the edge variation amount detecting means. To calculate and set the optimum value of the value, the edge variation amount detecting means
Use multiple discriminators for
Window that has been shifted by a predetermined amount
Verification of a plurality of reproduced pulse signals reproduced using a window
From the results of the phi check, the data discrimination win
A recording pulse correction method in a mark edge recording method, wherein a fluctuation amount from a center of a dough is detected . Wherein the Symbol record data pattern determination, based on the recording pulse length L ₀ of the write target, on the basis of the pulse length L ₀ and the blank length L ₁ of the recording pulse immediately before, or the pulse length L ₀ the recording pulse correction method in the mark edge recording method according to claim 3, characterized in that on the basis of the blank length L ₁ and the preceding recording pulse length L _2. 5. A laser beam intensity-modulated on an optical recording medium.
To form a recording mark whose length carries information.
When recording information by means of
The initial values of the width and output timing correction values are
Memory and write the recording pulse according to the specified data
Write to the optical recording medium according to the correction value stored in the
After recording, the recorded data is played back and
Data to calculate and set the optimal value of the correction value.
Recording in Makue' di recording system, characterized in that the
In the pulse correction method, the variation of the edge of the reproduced pulse signal from the reproduced clock is calculated.
Detected by the edge fluctuation detection means and according to this fluctuation
To calculate and set the optimum value of the correction value,
Using one discriminator for the edge variation detection means, the same pattern
After recording the specified data by repeating the
Shift the data discrimination window by a predetermined amount at birth
While playing and verifying this
From the center of the data discrimination window
A recording pulse correction method in a mark edge recording method, wherein the detection is performed. 6. A laser beam intensity-modulated on an optical recording medium.
To form a recording mark whose length carries information.
When recording information with
The pulse width and output timing of the recording pulse
When recording with correction, the initial value of this correction value is
From the memory and write the recording pulse with the specified data
To the optical recording medium according to the correction value stored in the memory
After writing and recording, the recorded data is played back and
Calculate and set the optimal value of the correction value from raw data
In the mark edge recording method, characterized in that
In the recording pulse correction method, the edge of the reproduction pulse signal corresponding to the recording data pattern is adjusted.
Edge fluctuation amount detection means for detecting the fluctuation amount from the reproduced clock of the edge
And the optimum value of the correction value is determined according to the amount of variation.
Is calculated and set, and the edge variation detecting means is
Using one discriminator for repeated data of the same pattern
After recording the specified data, the data
The windows are played back sequentially while shifting by a predetermined amount.
From the result of the verification check, the data
Detection of fluctuation from the center of Indiana
A recording pulse correction method in a mark edge recording method , characterized by the following . 7. A method for determining a recording data pattern, comprising:
Based on the recording pulse length L ₀ of the elephant, the pulse length L ₀ and
Beauty based on blank length L ₁ of the recording pulse immediately before, and
Is the pulse length L ₀ , the blank length L _1, and
Claims and performing based on the recording pulse length L ₂
Item 7. A recording pulse correction method in the mark edge recording method according to Item 6 .