JP3138610B2 - Recording method for phase change optical disk - 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 method for a phase change optical disk.

[0002]

2. Description of the Related Art With the spread of multimedia, read-only media such as music CDs (compact disks) and CD-ROMs and information reproducing apparatuses have been put into practical use. In recent years, a phase-change optical disk has attracted attention in addition to a recordable optical disk using a dye medium and a rewritable MO disk using a magneto-optical medium. This phase-change type optical disk records information by reversibly changing the phase of a recording material between a crystalline phase and an amorphous phase. At this time, M
Unlike O media and the like, recording and reproduction can be performed only with laser light without the need for an external magnetic field, and overwrite recording in which recording and erasing of information can be performed at once by irradiation of laser light is also possible. It has the characteristic.

As a general recording waveform in a phase change type optical disk, a single pulse recording method of recording by forming a recording mark by driving a laser light source with a single pulse emission waveform as shown in FIG. There is. However, in such a recording method, tearing distortion occurs in the recording mark as shown in FIG. 16 due to the heat stored, or an amorphous phase occurs due to insufficient cooling rate (the recording mark is formed by the amorphous phase). Is insufficiently formed, and low reflection due to the amorphous phase cannot be obtained.
There is a problem. This is because the recording is performed in the heat mode in which the state of the recording layer is determined depending on the attained temperature and the cooling rate, and thus the recording layer has a property that thermal non-linear distortion is easily generated in the recording process.

[0004] For this reason, in practice, as shown in FIG. 17, recording is performed by forming recording marks by a multi-pulse recording method using multiple recording powers. Such a recording method is described in, for example, the Technical Report of the Institute of Television Engineers of Japan (December 16, 1993) (ITE Technical
Report Vol.17.No.79.PP.7-12 VIR'93-83) "Study of high-speed recording rate and high-density recording method for phase change disk"
(Reference 1).

Here, in the multi-pulse recording method, a head heating pulse A, a subsequent continuous heating pulse B,
A multi-pulse emission waveform is formed by the continuous cooling pulse C located between these pulses so as to form a recording mark. The recording light emission power of each pulse is set so that P _WB ≧ P _WA > P _WC ≒ P _R (= reproduction power). That is, the multi-pulse waveform is an intensity-modulated waveform. An erase pulse D is prepared for a space located between recording marks, and the erase light emission power P _ED is set to P _WA <P _ED <P _WC . By controlling and driving the laser light source based on such a multi-pulse emission waveform, a sufficient reflectance difference can be provided between the recording mark and the space.

On the other hand, information recording methods include a mark position recording method (PPM = pulse position modulation method),
There is a mark edge recording method (PWM = pulse width modulation method) in which a recording mark is formed in a form in which the length carries information, but recently a mark edge recording method capable of coping with higher density has been used. is there. In the case of the mark edge recording method, the leading edge and the trailing edge of a recording mark each correspond to a codeword bit, so that the edge position needs to be accurate. However, in reality, when recording is performed on a phase change optical disk by the mark edge recording method, in addition to the tear-like distortion as described above, heating +
It is known that the edge shift occurs at the leading edge or the trailing edge of the recording mark due to different cooling conditions.

As a countermeasure against such an edge shift, for example, according to Japanese Patent Publication No. 6-64741, the leading edge of a recording pulse is determined in accordance with the interval from the immediately preceding pulse, ie, the space length immediately before the recording mark. In some cases, the timing is changed to change the width of the recording pulse to make correction. Further, according to the above-mentioned Document 1, when recording on a phase-change optical disk, a specific recording pattern is used to correct an edge shift occurring in a specific recording pattern such as a 2T mark / space in which an edge shift is likely to occur. In some cases, when the detection is detected, the setting value of the delay line is switched in real time to finely adjust the leading edge timing and the trailing edge timing of the recording pulse. Summarizing these correction methods and considering the multi-pulse recording method, FIG.
As shown in (1), it can be said that this method corrects the leading edge timing of the first heating pulse A or the trailing edge timing of the last heating pulse _BL .

[0008]

However, in the phase-change type optical disk, the recording mark = amorphous phase is formed by rapid cooling (heating → cooling). Therefore, in the correction of the heating pulse width as shown in FIG. Since it is not satisfied, the correction accuracy is not very good and the jitter of the interval between recording marks is large. This is because, as shown in FIG. 19, in the relationship between the correction amount of the heating pulse (the front and rear edge correction amounts) and the edge shift change amount of the recording mark to be formed, the edge shift change amount is very small with respect to the correction amount. Therefore, it is considered that it is difficult to set the correction amount, and the correction cannot be properly performed.

Further, since the edge shift of the recording mark is also caused by other factors, the method of correcting the heating pulse width is insufficient. The cause of the edge shift is an edge shift due to thermal interference with an adjacent recording mark depending on the space length before and after the recording mark. That is, this thermal interference is because the leading edge and the trailing edge of the recording mark to be written are affected by the heating of the recording mark immediately before and immediately after the recording mark. The degree of thermal interference depends on the space length immediately before and immediately after the recording mark to be written. The longer the space length, the smaller the effect, the shorter the space length, the greater the effect, and the longer the recording mark. Causes an edge shift. Even in the case of the edge shift due to such factors, in the heating pulse width correction method as described above, since the edge shift change amount with respect to the correction amount is too small, it is difficult to set the correction amount, and the correction cannot be performed properly.

Further, the mark edge recording method is suitable for high density. However, as the density increases, not only the edge shift due to thermal interference but also the heat storage of the immediately preceding recording mark depending on the immediately preceding recording mark length. Edge shifts also exist. This is because the amount of heat stored differs depending on the length of the immediately preceding recording mark, so that the front edge of the recording mark to be recorded is affected by the amount of heat and causes an edge shift. The degree of heat storage differs depending on the length of the immediately preceding recording mark. The shorter the recording mark length, the smaller the effect, and the longer the recording mark length, the greater the effect. In order to correct such an edge shift component,
According to the combination of the recording mark length to be recorded, the immediately preceding space length, and the immediately preceding recording mark length, the recording pulse =
What is necessary is just to correct a heating pulse. However, in such a correction method of the heating pulse width, since the amount of change in the edge shift with respect to the correction amount is too small, it is difficult to set the correction amount, and the correction cannot be performed properly.

It is an object of the present invention to provide a recording method for a phase change type optical disk capable of appropriately correcting an edge shift of a recording mark which may be caused by various factors and suppressing jitter of a recording mark interval. For the purpose.

[0012]

According to a first aspect of the present invention, there is provided a recording method for a phase change type optical disc, comprising: a phase change type optical disc having a recording layer which reversibly changes between a crystalline phase and an amorphous phase; continuous cooling pulse and Ile located between the top heating pulse between subsequent successive heating pulses and these pulses
Suparusu and Tona is, the light-emitting power of each pulse
There is irradiated with multi-pulse laser light leading heating pulse ≧ continuous heating pulses> erase pulses> Ru continuous cooling pulse der intensity modulation, so as to record information by forming a recording mark length carrying information In the recording method for a phase-change optical disk described above, the leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the recording mark length to be written.

[0013]

According to a second aspect of the present invention, there is provided a phase change type optical disk recording method similar to the first aspect of the present invention, wherein the recording mark length is determined based on a recording mark length to be written. The head cooling time and the final cooling time are corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse and changing the trailing edge timing of the final cooling pulse immediately after the leading heating pulse.

According to a third aspect of the present invention, there is provided a phase change type optical disk recording method similar to the first aspect of the present invention, wherein a space length immediately before a recording mark to be written is added to a space length immediately before a recording mark to be written. The leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse.

[0016]

According to a fourth aspect of the present invention, there is provided a phase change type optical disk recording method similar to the first aspect of the present invention, wherein the space length immediately before a recording mark to be written is reduced. The leading edge timing of the leading cooling pulse immediately after the leading heating pulse is changed based on the space length immediately after the recording mark to be written. The first cooling time and the last cooling time were corrected.

According to a fifth aspect of the present invention, there is provided a phase change type optical disk recording method similar to the first aspect of the invention. The leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the immediately preceding space length.

[0019]

A recording method for a phase change optical disk according to a sixth aspect of the present invention is the same as the recording method for a phase change type optical disk according to the first aspect of the invention. The leading edge timing of the first cooling pulse immediately after the first heating pulse is changed based on the immediately preceding space length, and the last recording pulse immediately after the last heating pulse is determined based on the recording mark length to be written and the space length immediately after this recording mark. The leading edge cooling time and the final cooling time are corrected by changing the trailing edge timing of the cooling pulse.

According to a seventh aspect of the present invention, there is provided a phase change type optical disk recording method similar to the first aspect of the invention. The leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the immediately preceding space length and the recording mark length immediately before the leading space.

The recording method for a phase change type optical disk according to the invention of claim 8 is the same as the recording method for phase change type optical disk according to the invention of claim 1, wherein the recording mark length to be written and the recording mark Based on the immediately preceding space length and the recording mark length immediately before this space, the leading edge timing of the first cooling pulse immediately after the first heating pulse is changed, and the recording mark length to be written and immediately after this recording mark are changed. The leading edge cooling time and the final cooling time are corrected by changing the trailing edge timing of the last cooling pulse immediately after the last heating pulse based on the space length of the first heating pulse.

According to the ninth aspect of the present invention, there is provided the first, second, and third aspects.
4, 5, 6, 7 or 8 Symbol A phase change optical disk recording method of mounting, and the same reference clock and a recording signal frequency for generating a continuous heating pulses for recording a continuous cooling pulse, the An integer multiple clock which is an integral multiple of the reference clock is provided, and the minimum unit of the correction amount for changing the edge timing is set to the pulse width by the integer multiple clock.

The invention according to claim 10 is the invention according to claims 1, 2, and
3,4,5,6,7,8 or 9 Symbol A phase change optical disk recording method of mounting, the recording layer is directed to a phase change optical disk comprising a recording material of AgInSbTe type.

[0025]

According to the first aspect of the invention, the leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the recording mark length to be written. By satisfying
Correction can be made appropriately so that the leading edge shift of the recording mark is reduced, and the jitter of the recording mark interval is reduced.

[0026]

[0027] In the invention of claim 2, wherein, based on the recording mark length which is a write target, along with changing the leading edge timing of the leading cooling pulse immediately after the head heating pulse, final cooling immediately after the final heating pulse Since the leading edge cooling time and the final cooling time are corrected by changing the trailing edge timing of the pulse, by satisfying the rapid cooling condition, the leading edge shift and the trailing edge shift of the recording mark can be properly corrected so as to be reduced. The jitter of the recording mark interval is reduced without deteriorating the jitter of the interval.

According to the third aspect of the present invention, the leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the space length immediately before the recording mark to be written. Therefore, the cooling condition for the leading edge shift of the recording mark due to thermal interference between the recording marks depending on the immediately preceding space length is satisfied, and the leading edge shift of the recording mark can be properly corrected so as to be reduced. Jitter is reduced.

[0029]

According to the fourth aspect of the present invention, the leading edge timing of the first cooling pulse immediately after the first heating pulse is changed based on the space length immediately before the recording mark to be written, and the recording to be written is performed. Since the leading edge cooling time and the final cooling time are corrected by changing the trailing edge timing of the last cooling pulse immediately after the last heating pulse based on the space length immediately after the mark, the recording marks depending on the space lengths immediately before and immediately after the last heating pulse are corrected. Satisfies the cooling condition for the leading edge shift and the trailing edge shift of the recording mark due to the thermal interference of the recording mark. Without this, the jitter at the recording mark interval is reduced.

According to the fifth aspect of the present invention, the leading edge timing of the leading cooling pulse immediately after the leading heating pulse is changed based on the length of the recording mark to be written and the space length immediately before the recording mark, thereby leading the leading cooling. Since the time is corrected, the cooling condition for the leading edge shift of the recording mark due to thermal interference between the recording marks depending on the recording mark length and the immediately preceding space length is satisfied, so that the leading edge shift of the recording mark is reduced. Can be corrected appropriately,
The jitter of the recording mark interval is reduced.

[0032]

[0033] In the invention of claim 6 wherein, together with changing the leading edge timing of the leading cooling pulse immediately after the first heating pulse based on the space length immediately before the recording mark length and the recording mark becomes a writing target, calligraphy The leading cooling time and the last cooling time are corrected by changing the trailing edge timing of the last cooling pulse immediately after the last heating pulse based on the recording mark length to be embedded and the space length immediately after this recording mark. The cooling condition for the leading edge shift and the trailing edge shift of the recording mark due to the thermal interference between the recording marks depending on the length and the space length immediately before and after the recording mark is satisfied, and the leading edge shift and the trailing edge shift of the recording mark are reduced. Recording mark interval without deteriorating the jitter of the space interval. Jitter is reduced.

According to the seventh aspect of the present invention, based on the recording mark length to be written, the space length immediately before this recording mark, and the recording mark length immediately before this space, the head immediately after the head heating pulse is used. Since the leading cooling time is corrected by changing the leading edge timing of the cooling pulse,
Satisfies cooling conditions for the leading edge shift of a recording mark due to heat storage depending on the immediately preceding recording mark length, the leading edge shift of a recording mark depending on the immediately preceding space length, and the leading edge shift due to thermal interference depending on the recording mark length. That is, the correction can be performed with high precision so that the leading edge shift of the recording mark is reduced, and the jitter of the recording mark interval is reduced.

According to the eighth aspect of the present invention, based on the recording mark length to be written, the space length immediately before this recording mark, and the recording mark length immediately before this space, the head immediately after the head heating pulse is used. The leading edge timing of the cooling pulse is changed, and the trailing edge timing of the last cooling pulse immediately after the last heating pulse is changed based on the length of the recording mark to be written and the space length immediately after this recording mark, thereby leading the first cooling. Since the time and the final cooling time are corrected, the cooling condition for the edge shift of the recording mark due to almost all the factors is satisfied, and the front edge shift and the rear edge shift of the recording mark can be corrected with high accuracy so as to be reduced. The jitter of the recording mark interval is reduced without deteriorating the jitter of the space interval.

According to the ninth aspect of the present invention, a reference clock having the same frequency as a recording signal for generating a continuous heating pulse and a continuous cooling pulse for recording, and an integer multiple clock which is an integral multiple of the reference clock are used. Since the minimum unit of the correction amount for changing the edge timing is set to the pulse width by this integral multiple clock, all of the operations including the correction of the edge timing can be realized by a logic circuit, and the cost is small and small. The correction circuit is sufficient.

According to the tenth aspect of the present invention, since the recording layer is intended for a phase-change type optical disk made of an AgInSbTe-based recording material, the characteristics of the recording layer match the characteristics of the recording layer against edge shift due to heat interference or heat storage. Accurate correction can be performed.

[0038]

The actual施例of EXAMPLES The invention will be described with reference to FIGS. The present embodiment is applied to a recording method of recording (overwriting) CD-ROM format code data using a phase-change optical disk. As a data modulation method, for example, EFM (Eight Fourteen Modul) is used.
ation) Recording shall be performed by a mark edge recording method using a modulation code. Therefore, in actual recording, a laser diode is used in FIG.
By emitting light according to the multi-pulse emission waveform as described in the above, and forming a recording mark = amorphous phase,
Information will be recorded.

First, FIG. 1B shows a multi-pulse emission waveform before correction when a recording mark having a recording mark length M1 is to be formed. Therefore, based on the result of measuring the shift amount of the front edge of the recording mark without correction, according to the recording mark length M1 of the recording mark to be recorded as shown in FIG. , changing the front edge timing of the leading cooling pulse C _F immediately after the head heating pulse a. Thus, the head cooling time is corrected. In this embodiment, the leading cooling pulse C is set for the same time (timing) as the edge shift amount so as to cancel the leading edge shift of the recording mark to be written.
Correction is made so that the front edge timing of _F is late or early.

[0040] By correcting the front edge timing of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount, cooling satisfy conditions for quenching Thus, the variation of the recording mark length due to the edge shift can be canceled. Accordingly, the leading edge shift of the recording mark can be reduced, and the jitter of the recording mark interval can be reduced.

In particular, the recording method of this embodiment is effective for a recording layer configuration or a recording waveform in which the leading edge shift of a recording mark occurs remarkably. in this regard,
This will be described with reference to FIG. Generally, as a recording material of a recording layer of a phase change optical disk, GeSbTe-based, GeTb-based,
eSbS system, TeGeSnAu system, GeTeSn system, S
bSe, SbSeTe, SnSeTe, GaSe
Te system, GaSeTeGe system, InSe system, InSe
System, InSeTe system, AgInSbTe system and the like.
When data is recorded on a phase-change type optical disk having a recording layer made of such a recording material, the head cooling pulse C _F
When the recording is performed by changing the front edge timing of the pulse width and changing the pulse width (= head cooling time) from the standard value, as shown in FIG. 2, the pulse width change amount (= time change amount)
In contrast, the change amount of the edge shift of the recording pulse tends to appear as a substantially linear relationship. In particular, AgInSbT
When an e-type recording material is used, it appears remarkably. This tendency is the same when recording is performed by changing the trailing edge timing of the final cooling pulse C _L and changing the pulse width (= final cooling time) from the standard value as in the embodiment described later. . This is because such a recording layer has a leading edge timing of the first cooling pulse C _F and a last cooling pulse C _F.
This is considered to be because the edge of the formed recording mark accurately corresponds to the rear edge timing of _L. Therefore, as in the embodiment described later, it is possible to accurately correct the edge shift due to the thermal interference and the heat storage effect, which is effective.

Since the recording mark length M1 to be corrected and the correction amount vary depending on the modulation code, the recording density, and the like,
In short, it is only necessary to set so as to satisfy the allowable jitter of the reproduction signal. Therefore, when the margin of the allowable jitter is strict, the minimum correction amount for the entire recording mark length or a plurality of recording mark lengths may be set small to perform the correction with high accuracy. As means for accurately generating the corrected leading cooling pulse _CF in multiple stages, a delay circuit such as a multi-tap delay line or a plurality of mono-multi vibrators is provided so that switching is performed in real time according to the recording mark length. It may be configured (the same applies to the following embodiments).

In the present embodiment, an example has been described in which code data is recorded by EFM modulation in the CD-ROM format. However, the present invention can be similarly applied to a case in which recording is performed in accordance with another format or another modulation code. The same applies to each embodiment.) Further, in this embodiment, the pulse width of the head heating pulse A is fixed, but the front edge timing of the head heating pulse A is fixed, and the front cooling pulse C _F is corrected (change of the front edge timing). Alternatively, the width of the head heating pulse A may be changed (this point can be similarly applied in the following embodiments).

Next, a reference example of the present invention will be described with reference to FIG. In addition, each of the following Examples including this Reference Example and Reference
In this example , the basic recording method and recording waveform are the same as those in the above-described embodiment, and the recording method of recording code data in CD-ROM format using a phase-change type optical disk is a data modulation method of an EFM modulation code. Is used to perform recording by the mark edge recording method.

In the present embodiment , based on the measurement result of the edge shift amount of the recording mark without correction, according to the recording mark length M1 of the recording mark to be written, FIG.
(C), the changing the edge timing after the last cooling pulse C _L immediately after the final heating pulse B _L. Thereby, the final cooling time is corrected. In this reference example, to cancel the edge shift after the recording mark to be write target, the edge shift amount and the same time only (time), so that the edge timing after the last cooling pulse C _L is slow or fast Has been corrected.

By correcting the trailing edge timing of the final cooling pulse C _{L in} this manner, the average edge interval of the target recording mark changes by the same amount as the correction amount, so that the cooling condition for rapid cooling is satisfied. Thus, the variation of the recording mark length due to the edge shift can be canceled. Therefore, the trailing edge shift of the recording mark can be reduced, and the jitter of the recording mark interval can be reduced. In particular, the recording method of the present embodiment employs a recording layer configuration in which a trailing edge shift of a recording mark occurs remarkably (particularly, a recording layer using an AgInSbTe-based recording material).
This is effective for recording and recording waveforms.

Another embodiment of the present invention will be described with reference to FIGS. This embodiment is a combination of the embodiment described above and the reference example . Based on the result of measuring the edge shift amount of the recording mark when there is no correction, FIG.
As shown in, along with changing the leading edge timing of the leading cooling pulse C _F immediately after the head heating pulse A, changing the edge timing after the last cooling pulse C _L immediately after the final heating pulse B _L. Thus, the first cooling time and the last cooling time are corrected. In this embodiment, the leading edge timing of the first cooling pulse C _F and the last cooling pulse C are set for the same time (timing) as each edge shift amount so as to cancel the edge shift before and after the recording mark to be written. Correction is made so that the trailing edge timing of _L is later or earlier.

[0048] By correcting the edge timing after the leading edge timing and a final cooling pulse C _L of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount This satisfies the cooling condition for rapid cooling, and the fluctuation of the recording mark length due to the edge shift can be canceled. Therefore, the edge shift before and after the recording mark can be reduced, and the jitter of the recording mark interval can be reduced. In particular, the recording method of the present embodiment employs a recording layer configuration in which an edge shift before and after a recording mark is remarkably generated (in particular, a recording layer using an AgInSbTe-based recording material).
This is effective for recording and recording waveforms. Further, it is also possible to prevent the edge shift in which the front and rear space lengths are offset due to the correction of the recording mark length using only the front or rear edge. Therefore, the jitter of the recording mark interval can be suppressed to a small value without deteriorating the jitter of the space interval.

Now, an example of a circuit configuration for realizing the recording method of this embodiment will be described with reference to FIG. A data correction detection unit 1 and a multi-pulse generation unit 2 that receive data based on the EFM modulation code are provided, and a correction process is performed based on the outputs of the data correction detection unit 1 and the multi-pulse generation unit 2. A data correction unit 3 is provided, and based on an output of the data correction unit 3, an output timing generator 4 that outputs pulses A, B, and C is controlled to generate an LD power control signal for a laser diode (not shown). It is configured to be.

Here, the data correction detection section 1 outputs a mark / space detector 5 for distinguishing between a recording mark and a space in the EFM data, and a selection signal corresponding to the detection result of the mark / space detector 5. A mark / space selector 6; a mark / space length counter 7 for counting the length of recording marks and spaces in EFM data; and a mark / space for storing the counting result in accordance with a selection signal of the mark / space selector 6. It is formed by the space length register 8. On the other hand, the multi-pulse generator 2 includes a generator 9 for the first heating pulse A, a generator 10 for the continuous heating pulse B, and a continuous cooling pulse C
And a power generator 11. The generator 11 for the continuous cooling pulse C
It includes a generator 11a for _F, and a generator 11b for final cooling pulse C _L. Further, the data correction unit 3 includes a correction data ROM table 12 in which correction amounts are stored in advance based on recording mark lengths and space lengths, a generator 9 for the first heating pulse A, and a final cooling pulse C _L.
Multi-stage delay lines 13 and 14 respectively connected to a generator 11b for
3 and 14 and multiplexers 15 and 16 connected to the correction data ROM table 12.
The output of the multiplexer 15 for the top heating pulse A, together are input to the output timing generator 4, also given to the generator 11a for leading cooling pulse C _F. The output of the generator 11a of the leading cooling pulse C _F is input directly to the output timing generator 4. The output of multiplexer 16 for final cooling pulse C _L are input to the output timing generator 4. The output of the generator 10 for the continuous heating pulse B is directly input to the output timing generator 4.

[0051] Thus, the top heating pulse A output from the generator 9 is delayed by the delay line 13 of the multi-stage, at the same time, the final cooling pulse C _L which is output from the generator 11b is delayed by the delay line 14 of the multi-stage. On the other hand, the correction amount is determined with reference to the correction data ROM table 12 based on the recording mark length M1 detected by the data correction detection unit 1, and the multiplexer 15,
The correction amount between the first heating pulse A and the last cooling pulse C _L is selected by outputting the correction signal to the first heating pulse A. Next, the head cooling pulse _CF is generated from the generator 11a based on the corrected head heating pulse A selected by the multiplexer 15. These head heating pulse A and head cooling pulse C _F
And by outputting and the final cooling pulse C _L consecutive heating pulses B on the output timing generator 4 by the generator 10, LD power control signal to match the timing of each of it is generated, the power control as described in FIG. 4 Be executed.

The circuit configuration of the timing control shown in FIG. 5 can be similarly applied to other embodiments or reference examples . For example, in the case of Examples or Reference Examples described later, in response to each of the embodiments or Reference Examples, the correction data RO
It is stored correction amount based before or like space length and immediately preceding recording mark length immediately after the other recording mark length into M table 12, the leading cooling pulse C _F and the last cooling pulse C _L accordingly The timing may be corrected.

Another embodiment of the present invention will be described with reference to FIG. In a phase-change optical disc, an edge shift may occur due to thermal interference with the immediately preceding recording mark depending on the space length immediately before the recording mark to be written. The edge shift due to such thermal interference is corrected. Therefore, based on the result of measuring the shift amount of the front edge of the recording mark without correction, as shown in FIG. 6C, according to the space length S1 immediately before the recording mark to be recorded and to be recorded. The first cooling pulse CF immediately after the first heating pulse A
Is changed. Thus, the head cooling time is corrected. In the present embodiment, the front edge timing of the leading cooling pulse CF is corrected to be later or earlier by the same time (timing) as the edge shift amount so as to cancel the front edge shift of the recording mark to be written. are doing.

[0054] By correcting the front edge timing of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount, cooling satisfy conditions for quenching Thus, the variation of the recording mark length due to the edge shift can be canceled. Therefore, the leading edge shift due to the thermal interference of the recording mark can be reduced with high accuracy, and the jitter of the recording mark interval can be reduced. The recording method of this embodiment is also effective when a recording layer configuration (in particular, one using an AgInSbTe-based recording material) or a recording waveform in which the leading edge shift of a recording mark is remarkable occurs.

Another reference example of the present invention will be described with reference to FIG. In the present embodiment , an edge shift due to thermal interference with a recording mark immediately after a recording mark to be written depends on a space length immediately after the recording mark is corrected. Therefore, based on the result of measuring the amount of shift of the trailing edge of the recording mark without correction, according to the space length S2 immediately after the recording mark to be recorded and to be recorded, FIG.
As shown in (5), the trailing edge timing of the final cooling pulse CL immediately after the final heating pulse BL is changed. Thereby, the final cooling time is corrected. In the present reference example , correction is made so that the trailing edge timing of the final cooling pulse CL is later or earlier by the same time (timing) as the edge shift amount so as to cancel the trailing edge shift of the recording mark to be written. are doing.

By correcting the trailing edge timing of the final cooling pulse CL in this manner, the average edge interval of the target recording mark changes by the same amount as the correction amount, so that the cooling condition for rapid cooling can be satisfied. That is, the change in the recording mark length due to the edge shift can be canceled. Therefore, the trailing edge shift due to the thermal interference of the recording mark can be reduced with high accuracy, and the jitter of the recording mark interval can be reduced. The recording method of the present reference example is also effective in the case of a recording layer configuration (in particular, one using an AgInSbTe-based recording material) or a recording waveform in which a trailing edge shift of a recording mark is remarkably generated. It is.

Another embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the embodiment described with reference to FIGS.
By combining the examples, the edge shift due to thermal interference with the preceding and following recording marks depending on the space length before and after the recording mark to be written is corrected.
Based on the result of measuring the edge shift amount of the recording mark in the case where there is no correction, as shown in FIG. 8C, according to the space length S1 immediately before the recording mark to be written, as shown in FIG. with changing the pre-edge timing of the leading cooling pulse C _F immediately, depending on the space length S2 of immediately after the recording mark to be write target, as shown in FIG. 8 (c), immediately after the last heating pulse B _L The rear edge timing of the final cooling pulse CL is changed. Thus, the first cooling time and the last cooling time are corrected. In this embodiment, so as to cancel the front and rear edge shift of the recording mark to be write target, only each of the edge shift amount and the same time (timing), leading cooling pulse C _F of the front edge timing and final cooling pulse CL
Is corrected so that the trailing edge timing becomes later or earlier.

[0058] By correcting the edge timing after the leading edge timing and a final cooling pulse C _L of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount This satisfies the cooling condition for rapid cooling, and the fluctuation of the recording mark length due to the edge shift can be canceled. Therefore, the edge shift before and after due to the thermal interference of the recording mark can be reduced with high accuracy, and the jitter of the recording mark interval can be reduced. In particular, the recording method of the present embodiment is effective for a recording layer configuration (especially one using an AgInSbTe-based recording material) or a recording waveform in which an edge shift before and after a recording mark occurs remarkably. is there. Further, it is also possible to prevent the edge shift in which the front and rear space lengths are offset due to the correction of the recording mark length using only the front or rear edge. Therefore, the jitter of the recording mark interval can be suppressed to a small value without deteriorating the jitter of the space interval.

Another embodiment of the present invention will be described with reference to FIG. This embodiment is a combination of the embodiments described with reference to FIGS. 1 and 6, and depends on the edge shift depending on the recording mark length to be written and the space length immediately before the recording mark to be written. The edge shift due to thermal interference with the immediately preceding recording mark is corrected. Therefore, based on the measurement result of the shift amount of the front edge of the recording mark without correction, the recording mark length M1 of the recording mark to be recorded and the space length S1 immediately before the recording mark are determined according to FIG. As shown in (c), the leading edge timing of the leading cooling pulse CF immediately after the leading heating pulse A is changed. Thus, the head cooling time is corrected. In the present embodiment, the front edge timing of the leading cooling pulse CF is corrected to be later or earlier by the same time (timing) as the edge shift amount so as to cancel the front edge shift of the recording mark to be written. are doing.

[0060] By correcting the front edge timing of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount, cooling satisfy conditions for quenching Thus, the variation of the recording mark length due to the edge shift can be canceled. Therefore, the front edge shift of the recording mark can be reduced with higher accuracy than in the above-described embodiments of FIGS. 1 and 6, and the jitter of the recording mark interval can be reduced. The recording method of this embodiment is also effective when a recording layer configuration (in particular, one using an AgInSbTe-based recording material) or a recording waveform in which the leading edge shift of a recording mark is remarkable occurs.

Another embodiment of the present invention will be described with reference to FIG. This reference example is a combination of the reference examples described with reference to FIGS. 3 and 7, and depends on the edge shift depending on the recording mark length to be written and the space length immediately after the recording mark to be written. The edge shift due to thermal interference with the recording mark immediately after the recording is corrected. Therefore, based on the measurement result of the shift amount of the trailing edge of the recording mark without correction, according to the recording mark length M1 of the recording mark to be recorded and the immediately following space length S2, As shown in FIG. 10C, the final cooling pulse CL immediately after the final heating pulse BL 2
Is changed. Thereby, the final cooling time is corrected. In this reference example , the rear edge timing of the final cooling pulse CL is delayed or delayed by the same time (timing) as the edge shift amount so as to cancel the rear edge shift of the recording mark to be written. It is corrected to be faster.

By correcting the trailing edge timing of the final cooling pulse C _{L in} this manner, the average edge interval of the target recording mark changes by the same amount as the correction amount, so that the cooling condition for rapid cooling is satisfied. Thus, the variation of the recording mark length due to the edge shift can be canceled. Therefore, the trailing edge shift of the recording mark can be reduced with higher accuracy than in the case of the above-described reference examples of FIGS. 3 and 7, and the jitter of the recording mark interval can be reduced. The recording method of the present embodiment is also effective when a recording layer configuration (in particular, one using an AgInSbTe-based recording material) or a recording waveform in which a trailing edge shift of a recording mark is remarkable occurs.

Another embodiment of the present invention will be described with reference to FIG. This embodiment combines the two embodiments described above with reference to FIGS. 4 and 8 to combine an edge shift depending on the recording mark length to be written and a preceding and succeeding recording mark depending on the space length before and after the shift. The edge shift due to thermal interference is corrected. Based on the measurement result of the edge shift amount of the recording mark without correction, as shown in FIG. 11C, according to the recording mark length M1 of the recording mark to be written and the space length S1 immediately before the recording mark length M1. In addition to changing the leading edge timing of the leading cooling pulse CF 2 immediately after the leading heating pulse A, according to the recording mark length M1 of the recording mark to be written and the space length S2 immediately after that, FIG. As shown, the trailing edge timing of the final cooling pulse CL immediately after the final heating pulse BL is changed. Thus, the first cooling time and the last cooling time are corrected. In the present embodiment, the leading edge timing of the leading cooling pulse CF and the leading edge timing of the last cooling pulse CL 2 are canceled by the same time (timing) as each edge shift amount so as to cancel the edge shift before and after the recording mark to be written. The correction is performed so that the trailing edge timing is delayed or advanced.

[0064] By correcting the edge timing after the leading edge timing and a final cooling pulse C _L of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount This satisfies the cooling condition for rapid cooling, and the fluctuation of the recording mark length due to the edge shift can be canceled. Therefore, the edge shift before and after the recording mark can be reduced with higher accuracy than in the above-described embodiment of FIGS. 4 and 8, and the jitter of the recording mark interval can be reduced. In particular, the recording method of the present embodiment employs a recording layer configuration in which an edge shift before and after a recording mark is remarkably generated (in particular, a recording layer using an AgInSbTe-based recording material).
This is effective for recording and recording waveforms. Further, it is also possible to prevent the edge shift in which the front and rear space lengths are offset due to the correction of the recording mark length using only the front or rear edge. Therefore, the jitter of the recording mark interval can be suppressed to a small value without deteriorating the jitter of the space interval.

Another embodiment of the present invention will be described with reference to FIG. In a phase change optical disk, an edge shift may occur due to heat accumulation of a preceding recording mark depending on the recording mark length immediately before the recording mark to be written.
Therefore, in this embodiment, in addition to the actual施例described with reference to FIG. 9, in which so as to correct also the edge shift component due to heat accumulation in the recording mark preceding such. Then, based on the result of measuring the shift amount of the front edge of the recording mark without correction, the recording mark length M1 of the recording mark to be recorded and the space length S
As shown in FIG. 12C, the leading edge timing of the leading cooling pulse CF immediately after the leading heating pulse A is changed according to the mark length M2 of the recording mark immediately before the leading heating pulse A. Thus, the head cooling time is corrected. In the present embodiment, the front edge timing of the leading cooling pulse CF is corrected to be later or earlier by the same time (timing) as the edge shift amount so as to cancel the front edge shift of the recording mark to be written. are doing.

[0066] By correcting the front edge timing of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount, cooling satisfy conditions for quenching And the heat storage effect by the immediately preceding recording mark length M2 and the immediately preceding space length S
The variation in the recording mark length caused by the edge shift due to the thermal interference depending on 1 can be canceled. Therefore, the reduction of the leading edge shift of the recording mark has been described with reference to FIG.
This can be performed with higher accuracy than in the embodiment, and the jitter of the recording mark interval can be reduced. The recording method of this embodiment is also effective when a recording layer configuration (in particular, one using an AgInSbTe-based recording material) or a recording waveform in which the leading edge shift of a recording mark is remarkable occurs.

Another embodiment of the present invention will be described with reference to FIG. In the present embodiment, in addition to the edge shift depending on the recording mark length to be written and the edge shift due to thermal interference with the recording marks before and after depending on the space length before and after the recording mark to be written, The edge shift component due to the heat accumulation of the recording mark depending on the immediately preceding recording mark length is also corrected. Based on the measurement result of the edge shift amount of the recording mark without correction, the recording mark length M1 of the recording mark to be written, the space length S1 immediately before the recording mark, and the recording mark length M of the recording mark immediately before the recording mark.
As shown in FIG. 13 (c), the leading edge timing of the leading cooling pulse CF immediately after the leading heating pulse A is changed according to 2 and the recording mark length M1 of the recording mark to be written and According to the space length S2 of the final heating pulse BL as shown in FIG.
, The trailing edge timing of the final cooling pulse CL immediately after is changed. Thus, the first cooling time and the last cooling time are corrected. In the present embodiment, the leading edge timing of the leading cooling pulse CF and the leading edge timing of the last cooling pulse CL 2 are canceled by the same time (timing) as each edge shift amount so as to cancel the edge shift before and after the recording mark to be written. The correction is performed so that the trailing edge timing is delayed or advanced.

[0068] By correcting the edge timing after the leading edge timing and a final cooling pulse C _L of the leading cooling pulse C _F Thus, the average interval between edges of recording marks of interest is, since changes as much as the correction amount , The cooling condition for rapid cooling is satisfied, and the change in the recording mark length caused by the heat storage effect by the immediately preceding recording mark length M2 and the edge shift due to the thermal interference of the recording marks depending on the preceding and following space lengths S1 and S2. You can cancel the minute. Therefore, the edge shift before and after the recording mark can be reduced with higher accuracy than in the embodiment of FIG. 11 described above, and the jitter of the recording mark interval can be reduced. In particular, the recording method of the present embodiment is effective for a recording layer configuration (especially one using an AgInSbTe-based recording material) or a recording waveform in which an edge shift before and after a recording mark occurs remarkably. is there. Further, it is also possible to prevent the edge shift in which the front and rear space lengths are offset due to the correction of the recording mark length using only the front or rear edge. Therefore, the jitter of the recording mark interval can be suppressed to a small value without deteriorating the jitter of the space interval.

Another embodiment of the present invention will be described with reference to FIGS. This embodiment is any of the above-described embodiments or
Are those that can be applied to the reference example, first, in the multi-pulse emission waveform, except the first heating pulse A, a recording signal of the light emission portion by the continuous heating pulses B and the continuous cooling pulse C is
It is set to be generated from a reference clock or a double clock having the same frequency as these recording signal frequencies.

[0070] Next, a method of performing head cooling pulse C _F of the front edge timing and final cooling pulse C correction of the leading edge or trailing edge of the recording mark by changing the edge timing after _L. Generally, a signal delay means is required to generate a correction pulse for this purpose. Usually, a multi-tap delay line IC or a multi-stage monomultivibrator is used as the signal delay means as shown in FIG. However, this increases the circuit scale, increases the cost, and increases the mounting area. In this regard, in the present embodiment, a method is used in which the corrected first cooling pulse _CF or the last cooling pulse _CL is generated using an integer n times the clock of the reference clock. The pulse width of the reference clock is T / 2, which is the same as the pulse width of the continuous heating pulse B and the continuous cooling pulse C, and the pulse width of the n-times clock is T / 2n. Therefore, by counting the pulse of the n-th clock at the rising edge, T / n
It is possible to generate a leading cooling pulse C _F or final cooling pulse C _L after correction for increasing or decreasing the pulse width in the step.
At the same time, by counting the pulses of the n-times clock at the falling edge of the n-times clock, the corrected first cooling pulse C _F or last cooling pulse C _L for increasing or decreasing the pulse width is counted.
, The correction pulse can be increased or decreased in T / 2n steps. For example, if to generate the leading cooling pulse C _F or final cooling pulse C _L corrected using the quadruple clock of the reference clock as shown in FIG. 14, it is possible to correct at T / 8 step.

[0071] Assuming that generates a correction pulse in this way, all can be configured by a logic circuit, it requires a small correction circuit at low cost, to minimize the increase in the number of components and mounting area be able to. Such a logic circuit may be applied, for example, to the circuit shown in FIG. 5 for the generator 9 for the first heating pulse A, the generator 11b for the last cooling pulse CL, and the delay lines 13 and 14 corresponding thereto. Good.

As a driver circuit for the laser diode 21, as shown in FIG. 15, the emission power P _WA for the first heating pulse A, the emission power P _WB for the continuous heating pulse B, and the emission for the continuous cooling pulse C are provided. The constant current sources 22, 23 and 24 whose powers are respectively set to the power P _WC are provided, and are selectively driven by switching elements 25, 26 and 27 which are respectively switched by A, B and C pulse control signals. A simple, low-cost circuit is sufficient.

[0073]

According to the first aspect of the present invention, the leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the recording mark length to be written. Therefore, the rapid cooling condition can be satisfied, the front edge shift of the recording mark can be properly corrected so as to be reduced, and the jitter of the recording mark interval can be reduced.

[0074]

According to the second aspect of the invention, the leading edge timing of the first cooling pulse immediately after the first heating pulse is changed based on the recording mark length to be written, and the last edge timing immediately after the last heating pulse is changed. Since the leading edge cooling time and the final cooling time are corrected by changing the trailing edge timing of the cooling pulse, the rapid cooling condition can be satisfied and the edge shift before and after the recording mark can be properly corrected so as to be reduced. Therefore, the jitter of the recording mark interval can be reduced without deteriorating the jitter of the space interval.

According to the third aspect of the present invention, the leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the space length immediately before the recording mark to be written. Thus, the cooling condition for the leading edge shift of the recording mark due to the thermal interference between the recording marks depending on the immediately preceding space length can be satisfied, and the leading edge shift of the recording mark can be properly corrected so as to be reduced. In addition, it is possible to reduce jitter of the recording mark interval.

[0077]

According to the fourth aspect of the present invention, the leading edge timing of the first cooling pulse immediately after the first heating pulse is changed based on the space length immediately before the recording mark to be written, and the writing mark is changed. The head cooling time and the final cooling time are corrected by changing the trailing edge timing of the last cooling pulse immediately after the last heating pulse based on the space length immediately after the recording mark, so that the recording depends on the space length before and after. The cooling condition for the edge shift before and after the recording mark due to the thermal interference between the marks can be satisfied, and the edge shift before and after the recording mark can be appropriately corrected so as to be reduced, thereby deteriorating the jitter of the space interval. In addition, it is possible to reduce the jitter of the recording mark interval.

According to the fifth aspect of the present invention, the leading edge timing of the leading cooling pulse immediately after the leading heating pulse is changed based on the recording mark length to be written and the space length immediately before the recording mark. Since the cooling time is corrected, the cooling condition for the leading edge shift of the recording mark due to the thermal interference between the recording marks depending on the recording mark length and the immediately preceding space length can be satisfied,
Correction can be appropriately performed so that the leading edge shift of the recording mark is reduced, and jitter of the recording mark interval can be reduced.

[0080]

According to the sixth aspect of the present invention, the leading edge timing of the leading cooling pulse immediately after the leading heating pulse is changed based on the recording mark length to be written and the space length immediately before the recording mark, The head cooling time and the final cooling time are corrected by changing the trailing edge timing of the last cooling pulse immediately after the last heating pulse based on the recording mark length to be written and the space length immediately after this recording mark. Therefore, the cooling condition for the edge shift before and after the recording mark due to the thermal interference between the recording marks depending on the recording mark length and the space length before and after can be satisfied, and the edge shift before and after the recording mark is appropriately reduced. The jitter of the recording mark interval can be reduced without deteriorating the jitter of the space interval. It is possible.

According to the seventh aspect of the invention, based on the recording mark length to be written, the space length immediately before this recording mark, and the recording mark length immediately before this space, the recording mark immediately after the head heating pulse is obtained. Since the leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse, the leading edge shift of the recording mark due to heat storage depending on the immediately preceding recording mark length, and the leading edge shift of the recording mark depending on the immediately preceding space length are performed. The cooling condition for the edge shift and the leading edge shift due to the thermal interference depending on the recording mark length can be satisfied, the correction can be performed with high accuracy so that the leading edge shift of the recording mark is reduced, and the jitter of the recording mark interval is reduced. Can be done.

According to the eighth aspect of the present invention, based on the recording mark length to be written, the space length immediately before the recording mark, and the recording mark length immediately before the space, the recording mark immediately after the head heating pulse is used. The leading edge timing of the first cooling pulse is changed, and the trailing edge timing of the last cooling pulse immediately after the last heating pulse is changed based on the recording mark length to be written and the space length immediately after this recording mark. Since the cooling time and the final cooling time are corrected, the cooling condition for the edge shift of the recording mark due to almost all factors can be satisfied, and the correction can be performed with high accuracy so that the edge shift before and after the recording mark is reduced. Therefore, the jitter of the recording mark interval can be reduced without deteriorating the jitter of the space interval.

According to the ninth aspect of the present invention, there is provided a reference clock having the same frequency as a recording signal for generating a continuous heating pulse and a continuous cooling pulse for recording, and an integer multiple clock which is an integral multiple of the reference clock. Since the minimum unit of the correction amount for changing the edge timing is set to the pulse width based on this integer multiple clock, all of the logic including the correction of the edge timing can be realized by a logic circuit, so that a small-scale correction can be performed at low cost. Can be achieved with a circuit.

According to the tenth aspect of the present invention, since the recording layer is a phase-change type optical disk made of an AgInSbTe-based recording material, the recording layer conforms to the characteristics of the recording layer against edge shift due to thermal interference and heat storage. Accurate correction can be performed.

[Brief description of the drawings]

FIG. 1 is a time chart showing an embodiment of the present invention.

FIG. 2 is a characteristic diagram illustrating a relationship between a front and rear edge correction amount and an edge shift amount.

FIG. 3 is a time chart showing a reference example of the present invention.

FIG. 4 is a time chart showing another embodiment of the present invention.

FIG. 5 is a block diagram illustrating a correction circuit configuration.

FIG. 6 is a time chart showing another embodiment of the present invention.

FIG. 7 is a time chart showing another reference example of the present invention.

FIG. 8 is a time chart showing another embodiment of the present invention.

FIG. 9 is a time chart showing another embodiment of the present invention.

FIG. 10 is a time chart showing another reference example of the present invention.

FIG. 11 is a time chart showing another embodiment of the present invention.

FIG. 12 is a time chart showing another embodiment of the present invention.

FIG. 13 is a time chart showing another embodiment of the present invention.

FIG. 14 is a time chart showing another embodiment of the present invention.

FIG. 15 is a block diagram illustrating an LD drive circuit.

FIG. 16 is a time chart showing an example of recording mark formation using a single pulse emission waveform.

FIG. 17 is a time chart showing an example of recording mark formation using a multi-pulse emission waveform.

FIG. 18 is a time chart showing a correction example of the heating pulse.

FIG. 19 is a characteristic diagram illustrating a relationship between a front and rear edge correction amount and an edge shift amount.

[Explanation of symbols]

 A Top heating pulse B Continuous heating pulse BL Final heating pulse C Continuous cooling pulse CF Top cooling pulse CL Final cooling pulse M1 Recording mark length M2 Recording mark length immediately before S1 Space length immediately before S2 Space length immediately after

Continuation of the front page (56) References JP-A-3-22223 (JP, A) JP-A-6-203383 (JP, A) JP-A-2-208834 (JP, A) JP-A-63-48617 (JP) JP-A-6-52547 (JP, A) JP-A-1-236431 (JP, A) JP-A-6-274934 (JP, A) JP-A-7-14206 (JP, A) 7-225947 (JP, A) 1994 Topical Meeting on Optical Data Storage, Procedings of SPIE (The International Society of Optical Engineering, V.). 2338, pp. 121-126 (16-18 May, 1994) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/125

Claims (10)

(57) [Claims] 1. A phase-change optical disc having a recording layer that reversibly changes between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing A recording method for a phase change optical disk, wherein a leading cooling time is corrected by changing a leading edge timing of a leading cooling pulse immediately after the leading heating pulse based on a target recording mark length. 2. A phase-change optical disc having a recording layer that reversibly changes between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing Based on the target recording mark length,
The head cooling time and the final cooling time are corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse and changing the trailing edge timing of the final cooling pulse immediately after the leading heating pulse. A recording method for a phase change optical disk, characterized by comprising: 3. A phase-change optical disc having a recording layer that reversibly changes in phase between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing A recording method for a phase-change optical disc, wherein a leading cooling time is corrected by changing a leading edge timing of a leading cooling pulse immediately after a leading heating pulse based on a space length immediately before a target recording mark. . 4. A phase-change optical disc having a recording layer that reversibly changes between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing The leading edge timing of the leading cooling pulse immediately after the leading heating pulse is changed based on the space length immediately before the target recording mark, and the leading edge of the leading cooling pulse is changed based on the space length immediately after the recording mark to be written. Note that the leading edge cooling time and the final cooling time are corrected by changing the edge timing after the final cooling pulse. Phase-change optical disc recording method according to. 5. A phase-change optical disc having a recording layer that reversibly changes in phase between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing A phase change, wherein the leading cooling time is corrected by changing the leading edge timing of the leading cooling pulse immediately after the leading heating pulse based on the target recording mark length and the space length immediately before the recording mark. Recording method for compact optical disks. 6. A phase-change optical disc having a recording layer that reversibly changes between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing The leading edge timing of the first cooling pulse immediately after the first heating pulse is changed based on the target recording mark length and the space length immediately before this recording mark, and the recording mark length to be written and the immediately following this recording mark are changed. By changing the trailing edge timing of the final cooling pulse immediately after the final heating pulse based on the space length,
A recording method for a phase-change optical disk, wherein a start cooling time and a final cooling time are corrected. 7. A phase-change optical disk having a recording layer that reversibly changes between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing The head cooling time is changed by changing the leading edge timing of the head cooling pulse immediately after the head heating pulse based on the target recording mark length, the space length immediately before this recording mark, and the recording mark length immediately before this space. A recording method for a phase-change optical disk, wherein the recording method is corrected. 8. A phase-change optical disc having a recording layer that reversibly changes in phase between a crystalline phase and an amorphous phase.
Leading heating pulse and Ri Na <br/> and a subsequent continuous heating pulse and continuous cooling pulses and the erase pulses located between these pulses, the light emitting power leading heating pulse ≧ consecutive heating pulses of each pulse> erase pulse> by irradiating was continuously cooling pulse der Ru intensity-modulated multi-pulse laser light, the phase change optical disk recording method to record information by forming a recording mark length carrying information, writing The leading edge timing of the first cooling pulse immediately after the first heating pulse is changed based on the target recording mark length, the space length immediately before this recording mark, and the recording mark length immediately before this space, and After the last cooling pulse immediately after the last heating pulse, the By changing the timing, phase-change optical disc recording method is characterized in that so as to correct the first cooling time and a final cooling time. 9. A reference clock having the same frequency as a recording signal for generating a continuous heating pulse and a continuous cooling pulse for recording, and an integer multiple clock which is an integral multiple of the reference clock, and edge timing is changed. the smallest unit of the correction amount, claim 1,2,3,4,5,6,7 also characterized by being set to the pulse width by the integral multiple clock
8 Symbol mounting phase change optical disk recording method of. 10. The method of claim 5, 6, 7, 8 or 9 type recording layer, characterized in that the target phase-change optical disc comprising a recording material of AgInSbTe system <br The recording method for a phase change optical disk described in the above paragraph.