JP2000105927A - Recording method for phase changing type optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the errors of a medium (phase changing type optical disk) by reducing the deterioration of the mark of an area immediately after the start of recording regarding a phase changing type optical disk having address information on a header, a prepit or the like. SOLUTION: In the recording method of a phase changing type optical disk for recording recording data in the phase changing type optical disk having address information on a header, a prepit or the like, when recording the recording data, indefinite random data ((3) prewriting signal) is recorded in an area twice as large as or more than a maximum mark length immediately after all of the header and the prepit ((1) address signal), and then the recording data ((4) recording data) is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording data on a phase-change optical disc provided with address information such as headers, pre-pits, etc. The present invention relates to a recording method for a phase change optical disc which aims to reduce the deterioration of marks recorded immediately thereafter.

[0002]

2. Description of the Related Art As one of conventional optical disks, there is a phase change type optical disk utilizing a difference in the refractive index of a substance such as a phase change between a crystal and an amorphous. In such a phase-change optical disk, when a light spot is irradiated for recording, the portion is rapidly heated / cooled to become amorphous, and the reflectance changes.
By utilizing this change in reflectivity, recording data is recorded on a track (optical disk) as a mark.

[0003] As a property of a rewritable optical disk, it is known that when the same recording data is repeatedly overwritten in the same place, the mark and its surroundings are deteriorated by thermal damage.

To solve this problem, as disclosed in, for example, Japanese Patent Publication No. 8-10489, "Optical Disk Recording Method and Optical Disk Apparatus",
There has been proposed a method of randomly changing the recording start point of an optical disc within a range where recording data is contained within a sector. According to this method, the recording start point of the recording data is randomly changed within the sector, thereby preventing the same location from being repeatedly used, averaging and reducing the fatigue of the disk material, and consequently being repeatedly used. The number of times can be improved.

[0005]

However, according to the above-mentioned prior art, a recording method for an optical disk in which a rewritable optical disk having a sector structure is irradiated with a laser beam and recording data including a synchronization signal is recorded in each sector. However, the recording start point of the recording data in each sector is changed at random, and cannot be applied to a phase change optical disk provided with address information such as a header and a pre-pit.

When the address (address information) of the phase change optical disk is detected and recorded, the recording start position of the recording data is likely to be the same position, and a repetitive mark is formed at the same position on the phase change optical disk. Therefore, there is a problem that marks in an area immediately after the start of recording are easily deteriorated due to thermal damage, and there is a possibility that an error of a medium (a phase change optical disk) may occur. In particular, when the same pattern was recorded in the worst case, the mark recorded in the area immediately after the start of the recording was easily deteriorated.

The present invention has been made in view of the above, and in a phase change optical disk provided with address information such as a header and a pre-pit, it is possible to reduce the deterioration of marks in an area immediately after the start of recording, and It is an object of the present invention to reduce errors of a variable optical disk.

[0008]

According to a first aspect of the present invention, there is provided a recording method for a phase change type optical disk, comprising: a phase change type optical disk provided with address information such as a header and a prepit; In the recording method of a phase-change optical disc for recording recording data, when recording the recording data, after recording all the headers, unspecified random data in an area at least twice the maximum mark length immediately after the prepit, The recording data is recorded.

According to a second aspect of the present invention, there is provided a phase change type optical disk recording method for recording data on a phase change type optical disk provided with address information such as headers and pre-pits. When recording the recording data, the recording data is recorded after erasing all the headers and areas immediately after the pre-pit, which are at least twice the maximum mark length.

According to a third aspect of the present invention, there is provided a phase change type optical disk recording method for recording data on a phase change type optical disk provided with address information such as headers and pre-pits. When recording the recording data, a header of a recording start position,
Immediately after the pre-pit, unspecified random data is recorded in an area at least twice the maximum mark length, and then the recording data is recorded.

According to a fourth aspect of the present invention, there is provided a phase change type optical disk recording method for recording data on a phase change type optical disk provided with address information such as headers and pre-pits. When recording the recording data, a header of a recording start position,
Immediately after the pre-pit, an area having a length of at least twice the maximum mark length is erased, and then the recording data is recorded.

According to a fifth aspect of the present invention, there is provided a phase change type optical disk recording method for recording data on a phase change type optical disk provided with address information such as headers and pre-pits. When recording the recording data, the recording start position immediately after all the headers and pre-pits is changed every O / W times (twice the Mode maximum mark length) by the maximum mark length immediately after all the headers and pre-pits. The recording is performed by increasing or decreasing the recording start position by 1T up to the double position.

According to a sixth aspect of the present invention, there is provided a phase change type optical disk recording method for recording data on a phase change type optical disk provided with address information such as headers and pre-pits. When recording the recording data, the recording start position immediately after all the headers and pre-pits is changed every O / W times (twice the Mode maximum mark length) by the maximum mark length immediately after all the headers and pre-pits. Recording is performed by increasing or decreasing the recording start position by 1T up to the triple position.

According to a seventh aspect of the present invention, there is provided a phase change type optical disk recording method for recording data on a phase change type optical disk provided with address information such as headers and pre-pits. When recording the recording data, the recording start position immediately after all the headers and pre-pits is changed every O / W times (twice the Mode maximum mark length) by the maximum mark length immediately after all the headers and pre-pits. Recording is performed by increasing or decreasing the recording start position by 1T up to the quadruple position.

According to another aspect of the present invention, there is provided a method for recording a phase-change optical disc according to any one of the first to seventh aspects. The main component of the material is at least A
g, In, Sb, and Te.

According to a ninth aspect of the present invention, in the recording method of the phase change type optical disk according to the eighth aspect, the recording and / or reproducing method for recording the recording data is performed.
The reproduction linear velocity is 3 to 15 m / s.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a recording method for a phase change optical disk according to the present invention will be described with reference to [Layer Structure of Optical Disk], [Examples 1] to [Example 9], [Comparative Example 1], [Comparative Example 2]. ] And [Results of Examples and Comparative Examples] will be described in detail with reference to the drawings.

[Layer Structure of Optical Disc] First, referring to FIG. 1, the layer structure of the phase change optical disc used in the following embodiments 1 to 9 will be described. The phase-change optical disc 100 uses PC (polycarbonate: refractive index 1.58) as a substrate 101 and a lower protective layer 1 thereon.
02, a recording layer 103 is formed on the lower protective layer 102, an upper protective layer 104 is formed on the recording layer 103, and a heat dissipation layer 105 is formed on the upper protective layer 104. This is a configuration in which a UV protection layer 106 is formed.

The material of the lower protective layer 102 is as follows.
ZnS. SiO ₂ , SiNx, etc. can be used. Use SiO ₂ .

The material of the recording layer 103 is Ag
InSbTe, GeSbTe, or the like can be used. Here, a film thickness of 17 nm is formed using AgInSbTe.

The material of the upper protective layer 104 is as follows.
ZnS. SiO ₂ , SiNx, etc. can be used. SiO ₂ (film thickness 20 nm, refractive index 2.
Use 1).

The material of the heat radiation layer 105 is A
1, Al alloy, Au, Ag, etc. can be used. Here, an Al alloy (Al-Ti: 1 wt%: 120 nm) is used.

As a material of the UV protection layer 106, a UV curable resin is used.

The phase-change optical disk 1 shown in FIG.
Although not shown in the drawing, 00 is provided with a header, pre-pits, and the like, which are address information.

[Embodiment 1] The recording method of the phase change type optical disk of the embodiment 1 is to record the recording data on the phase change type optical disk which can record the recording data in the case where there is a header, a pre-pit, etc. as the address information. After recording all the headers and random data of at least twice the maximum mark length immediately after the pre-pits, the data to be originally recorded (recorded data) is recorded.

FIG. 2 is an explanatory diagram showing the relationship between the recording of random data (corresponding to a prewrite signal) and the recording timing and recording position of the recorded data in the first embodiment. In the figure, the relationship among an address signal, an address-end signal, and a prewrite signal indicates a timing. First, a prewrite signal is recorded based on an address signal corresponding to address information such as a header and a prepit and an address-end signal. . At this time, as shown in the figure, random data of twice or more the maximum mark length is recorded immediately after the address signal as a prewrite signal. In the first embodiment, the maximum mark length is set to 14T, and the prewrite signal is twice the maximum mark length (28
The random data of T) is used.

The relationship between the address signal, the address-end signal, and the recording data indicates the timing, and the relationship between the prewrite signal and the recording data indicates the correspondence between the recording positions. Therefore, after the pre-write signal is recorded, the address signal and the address signal corresponding to the address information such as the header and the pre-pit are next recorded.
Recording data is recorded based on the end signal. That is, as shown in the figure, the recording data is overwritten on the prewrite signal immediately after the address-end signal.

After recording 1,000 times by the method of the first embodiment, 635 nm Write (NA =
0.6) / 650 nm (NA = 0.6) Read, data error after correction once at a linear velocity of 3.5 m / s (/ 1EC
C) As a result of evaluating the data error (/ 1 ECC) after the twice correction, the result shown in Example 1 of FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the results of Example 1 in FIG. 3, the data error after one correction was as small as "28", and the data error after two corrections could be "0".

As is apparent from the results of the first embodiment, when recording data is recorded, random data of at least twice the maximum mark length is recorded immediately after all headers and prepits, and then the original recording is performed. By recording the data to be recorded (recorded data), it is possible to reduce the thermal damage of the area immediately after the start of recording and to reduce the deterioration of the recorded mark, thereby reducing the error of the medium (phase change optical disk). Can be reduced.

[Embodiment 2] The recording method of a phase change type optical disc according to the second embodiment is intended for recording data on a phase change type optical disc on which record data can be recorded when there are headers, prepits, etc. as address information. Then, after erasing all headers and an area at least twice the maximum mark length immediately after the pre-pits, data to be originally recorded (recorded data) is recorded.

FIG. 5 is an explanatory diagram showing the relationship between the erasure of the area (corresponding to the play raise signal) and the recording timing and recording position of the recording data in the second embodiment. In the figure, the relationship among an address signal, an address-end signal, and a play-raise signal indicates timing. First, a maximum mark in a play-raise signal is determined based on an address signal corresponding to address information such as a header and a pre-pit and an address-end signal. Erasing the area twice or more the length. In the second embodiment, the maximum mark length is set to 14T, and the area to be erased by the play raise signal is set to twice the maximum mark length (28T).

The relationship among the address signal, the address-end signal, and the recording data indicates the timing, and the relationship between the play raise signal and the recording data indicates the correspondence between the recording positions. Therefore, after erasing by the play raise signal, the recording data is recorded based on the address signal corresponding to the address information such as the header and the pre-pit and the address-end signal. That is, as shown in the figure, the recording data is overwritten immediately after the address-end signal on the area erased by the play raise signal.

After recording 1,000 times by the method of the second embodiment, 635 nm Write (NA =
0.6) / 650 nm (NA = 0.6) Read, data error after correction once at a linear velocity of 3.5 m / s (/ 1EC
C) As a result of evaluating the data error (/ 1 ECC) after the twice correction, the result shown in Example 2 of FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the result of the second embodiment in FIG. 3, the data error after the first correction is as small as "32", and the data error after the second correction is "0".

As is apparent from the results of the above-described second embodiment, when recording data, after erasing all headers and areas more than twice the maximum mark length immediately after the pre-pit, the original recording should be performed. By recording data (recorded data), it is possible to reduce thermal damage in the area immediately after the start of recording and to reduce deterioration of the recorded mark.
As a result, errors in the medium (phase change optical disk) can be reduced.

[Embodiment 3] The recording method of the phase-change optical disc according to the third embodiment is applied to a case where recording data is recorded on a phase-change optical disc capable of recording the recording data in the case where there is a header, a pre-pit or the like as address information. After recording unspecified random data in an area at least twice the maximum mark length immediately after the header at the recording start position and the prepit, data to be originally recorded (recording data) is recorded.

FIG. 6 is an explanatory diagram showing the relationship between the recording of random data (corresponding to a prewrite signal), the recording timing of recording data, and the recording position in the third embodiment. In the figure, the relationship among an address signal, an address-end signal, and a prewrite signal indicates a timing. First, a prewrite signal is recorded based on an address signal corresponding to address information such as a header and a prepit and an address-end signal. . At this time, as shown in the figure, random data of twice or more the maximum mark length is recorded immediately after the address signal as a prewrite signal. In the third embodiment, the maximum mark length is set to 14T, and the prewrite signal is four times the maximum mark length (56
The random data of T) is used.

The relationship among the address signal, the address-end signal, and the recording data indicates the timing, and the relationship between the prewrite signal and the recording data indicates the correspondence between the recording positions. Therefore, after the pre-write signal is recorded, the address signal and the address signal corresponding to the address information such as the header and the pre-pit are next recorded.
Recording data is recorded based on the end signal. That is, as shown in the figure, the recording data is overwritten on the prewrite signal immediately after the address-end signal.

However, in the third embodiment, as apparent from FIG. 6, the position at which the random data is recorded using the prewrite signal is not at the position immediately after all the headers and prepits (immediately after all the address signals), but at all. Only the header corresponding to the recording start position and immediately after the pre-pit (only immediately after the first address signal in FIG. 6).

After recording 1,000 times by the method of the third embodiment, 635 nm Write (NA =
0.6) / 650 nm (NA = 0.6) Read, data error after correction once at a linear velocity of 3.5 m / s (/ 1EC
C) As a result of evaluating a data error (/ 1 ECC) after two corrections, the result shown in Example 3 of FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the results of Example 3 in FIG. 3, the data error after one correction was as small as "8", and the data error after two corrections was "0".

As is apparent from the result of the third embodiment, when recording the recording data, after recording the random data of twice or more the maximum mark length immediately after the header at the recording start position and immediately after the pre-pit, the original data is recorded. By recording the data to be recorded (recording data), it is possible to reduce the thermal damage of the area immediately after the start of recording and to reduce the deterioration of the recorded mark. Errors can be reduced.

[Fourth Embodiment] The recording method of a phase change optical disk according to the fourth embodiment is intended for recording data on a phase change optical disk on which record data can be recorded when there are headers, prepits, etc. as address information. Then, after erasing the area at least twice the maximum mark length immediately after the header at the recording start position and the pre-pit, the original data to be recorded (recording data) is recorded.

FIG. 7 is an explanatory diagram showing the relationship between the erasure of an area (corresponding to a play raise signal) and the recording timing and recording position of recording data in the fourth embodiment. In the figure, the relationship among an address signal, an address-end signal, and a play-raise signal indicates timing. First, a maximum mark in a play-raise signal is determined based on an address signal corresponding to address information such as a header and a pre-pit and an address-end signal. Erasing the area twice or more the length. In the fourth embodiment, the maximum mark length is set to 14T, and the area to be erased by the play raise signal is set to three times the maximum mark length (42T).

The relationship between the address signal, the address-end signal, and the recording data indicates the timing, and the relationship between the play raise signal and the recording data indicates the correspondence between the recording positions. Therefore, after erasing by the play raise signal, the recording data is recorded based on the address signal corresponding to the address information such as the header and the pre-pit and the address-end signal. That is, as shown in the figure, the recording data is overwritten immediately after the address-end signal on the area erased by the play raise signal.

However, in the fourth embodiment, as is apparent from FIG. 7, the area to be erased using the play-raise signal is not immediately after all the headers and pre-pits (immediately after all the address signals) but at the start of recording. Only the header corresponding to the position, immediately after the pre-pit (only immediately after the first address signal in FIG. 7).

After recording 1,000 times by the method of the above-mentioned Example 4, 635 nm Write (NA =
0.6) / 650 nm (NA = 0.6) Read, data error after correction once at a linear velocity of 3.5 m / s (/ 1EC
C) As a result of evaluating the data error (/ 1 ECC) after the twice correction, the result shown in Example 4 of FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the results of Example 4 in FIG. 3, the data error after the first correction was as small as "12", and the data error after the second correction was "0".

As is apparent from the result of the fourth embodiment, when recording the recording data, after erasing the area at least twice the maximum mark length immediately after the header at the recording start position and the pre-pit, the original recording is performed. Data to be recorded (recorded data)
By recording the information, it is possible to reduce the thermal damage of the area immediately after the start of the recording and to reduce the deterioration of the recorded mark, thereby reducing the error of the medium (phase-change optical disk).

[Embodiment 5] The recording method of the phase change type optical disk of the embodiment 5 is to record the recording data on the phase change type optical disk which can record the recording data when there are headers, prepits, etc. as the address information. In addition, all the headers, O / W
For each number of times (twice the Mode maximum mark length), recording is started from immediately after all headers and pre-pits to a position twice the maximum mark length by increasing or decreasing the recording start position every 1T. is there.

FIG. 8 is an explanatory diagram showing the relationship between the recording start position (corresponding to the recording start position signal) and the recording data recording timing in the fifth embodiment. First, the header,
A recording start position signal is generated based on an address signal corresponding to address information such as pre-pits and an address-end signal. At this time, the recording start position signal is, as shown in the figure, a position that is twice the maximum mark length immediately after the address signal every O / W times (twice the Mode maximum mark length) immediately after all headers and prepits. The recording start position is generated so as to increase or decrease the recording start position every 1T. In the fifth embodiment, assuming that the maximum mark length is 14T, recording start (falling of the recording start signal in this case) occurs up to a position twice as large as the maximum mark length (28T) as the recording start position signal. To be generated.

Next, recording data is recorded based on the recording start position signal. That is, as shown in the figure, the recording data is not immediately after the address-end signal,
Recording is performed immediately after the recording start position signal.

After recording 1,000 times by the method of the above-mentioned Example 5, 635 nm Write (NA =
0.6) / 650 nm (NA = 0.6) Read, data error after correction once at a linear velocity of 3.5 m / s (/ 1EC
C) As a result of evaluating the data error (/ 1 ECC) after the twice correction, the result shown in Example 5 of FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the results of Example 5 in FIG. 3, the data error after one correction was as small as "21", and the data error after two corrections could be set to "0".

As is apparent from the result of the above-described fifth embodiment, when recording the recording data, the recording start position immediately after all the headers and pre-pits is set to the number of O / W times (Mode).
The recording start is performed by increasing or decreasing the recording start position every 1T from immediately after all the headers and pre-pits to a position twice as large as the maximum mark length for each (double the maximum mark length). Reduces thermal damage in the area immediately after,
Deterioration of the recorded mark can be reduced, and thereby errors in the medium (phase change optical disk) can be reduced.

[Embodiment 6] The recording method of the phase-change optical disc according to the sixth embodiment is to record the record data on a phase-change optical disc capable of recording the record data when there is a header, pre-pit, etc. as the address information. In addition, all the headers, O / W
For each number of times (twice the Mode maximum mark length), recording is started from immediately after all headers and pre-pits to a position three times the maximum mark length by increasing or decreasing the recording start position every 1T. is there.

FIG. 9 is an explanatory diagram showing the relationship between the recording start position (corresponding to the recording start position signal) and the recording timing of the recording data in the sixth embodiment. First, the header,
A recording start position signal is generated based on an address signal corresponding to address information such as pre-pits and an address-end signal. At this time, as shown in the figure, the recording start position signal is at a position three times the maximum mark length immediately after the address signal for every O / W count (twice the Mode maximum mark length) immediately after the address signal. The recording start position is generated so as to increase or decrease the recording start position every 1T. In the sixth embodiment, assuming that the maximum mark length is 14T, the recording start (here, the fall of the recording start signal) occurs as the recording start position signal up to a position three times the maximum mark length (42T). To be generated.

Next, recording data is recorded based on the recording start position signal. That is, as shown in the figure, the recording data is not immediately after the address-end signal,
Recording is performed immediately after the recording start position signal.

After recording 1,000 times by the method of the above-mentioned Example 6, 635 nm Write (NA =
0.6) / 650 nm (NA = 0.6) Read, data error after correction once at a linear velocity of 3.5 m / s (/ 1EC
C) As a result of evaluating a data error (/ 1 ECC) after correction twice, the result shown in Example 6 in FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the results of Example 6 in FIG. 3, the data error after one correction was as small as "10", and the data error after two corrections could be set to "0".

As is apparent from the results of the sixth embodiment, when recording the recording data, the recording start position immediately after all the headers and pre-pits is set to the number of O / W times (Mode).
The recording start is performed by increasing or decreasing the recording start position every 1T from immediately after all the headers and pre-pits to a position three times the maximum mark length for each (double the maximum mark length). Reduces thermal damage in the area immediately after,
Deterioration of the recorded mark can be reduced, and thereby errors in the medium (phase change optical disk) can be reduced.

[Embodiment 7] The recording method of the phase-change optical disc according to the embodiment 7 is for recording the record data on the phase-change optical disc capable of recording the record data when there is a header, a pre-pit, etc. as the address information. In addition, all the headers, O / W
At every number of times (twice the Mode maximum mark length), the recording start position is increased or decreased by 1T from immediately after all headers and pre-pits to a position four times the maximum mark length.

FIG. 10 is an explanatory diagram showing the relationship between the recording start position (corresponding to the recording start position signal) and the recording data recording timing in the seventh embodiment. First, the header,
A recording start position signal is generated based on an address signal corresponding to address information such as pre-pits and an address-end signal. At this time, as shown in the figure, the recording start position signal is at a position four times the maximum mark length immediately after the address signal for every O / W count (twice the Mode maximum mark length) immediately after the address signal. The recording start position is generated so as to be increased or decreased by 1T in the period up to. In the seventh embodiment, the maximum mark length is set to 14T, and the recording start position signal is set to four times the maximum mark length (5
6T) is generated so that the start of recording (here, the fall of the recording start signal) occurs before the position of 6T).

Next, recording data is recorded based on the recording start position signal. That is, as shown in the figure, the recording data is not immediately after the address-end signal,
Recording is performed immediately after the recording start position signal.

After recording 1,000 times by the method of the above-mentioned Example 7, 635 nm Write (NA =
0.6) / 650 nm (NA = 0.6) Read, data error after correction once at a linear velocity of 3.5 m / s (/ 1EC
C) As a result of evaluating the data error (/ 1 ECC) after the twice correction, the result shown in Example 7 in FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the results of Example 7 in FIG. 3, the data error after one correction was as small as "7", and the data error after two corrections was "0".

As is clear from the results of the above-described embodiment 7, when recording the recording data, the recording start position immediately after all the headers and pre-pits is set to the number of O / W times (Mode).
The recording start position is increased or decreased by 1T from immediately after all the headers and pre-pits to a position four times the maximum mark length for each time (two times the maximum mark length), thereby recording the area immediately after the start of recording. Thermal damage can be reduced, and deterioration of recorded marks can be reduced, thereby reducing errors of a medium (phase change optical disk).

[Embodiment 8] In the recording method for a phase change optical disk according to the eighth embodiment, an experiment was conducted by focusing on the material of the recording layer of the phase change optical disk in the first to seventh embodiments. The main component of the recording layer is at least Ag, In, S
By including b and Te, high-density recording can be performed. With this recording layer composition, high sensitivity (recording power of 15 mW or less) and high density (linear density of 0.2 μm /
(bit, track pitch 0.7 μm). When the address is not considered, φ120m
Recording of about 5 GB is possible with m media.

As shown in the results of Example 8 in FIG. 11, when the composition of the recording layer was AgInSbTe, a recording capacity of 5 GB was achieved at a recording linear velocity of 3.5 m / s.

[Embodiment 9] In the recording method for a phase-change optical disk according to the embodiment 9, an experiment was conducted in the embodiment 8 by further focusing on the recording / reproducing linear velocity when recording data was recorded. . By setting the recording / reproducing linear velocity to 3 to 15 m / s, a medium having a high transfer rate can be realized.

As shown in the results of Example 9 in FIG. 11, the composition of the recording layer was AgInSbTe, and the recording linear velocity was 8
By setting m / s, it was possible to realize a high transfer rate with a storage capacity of 5 GB.

[Comparative Example 1] An experiment of Comparative Example 1 was performed as a comparative object of Examples 1 to 7. In Comparative Example 1, recording data is recorded using the phase-change optical disc 100 shown in FIG. 1 in synchronization with an address by a conventional method.

After recording 1,000 times by the method of Comparative Example 1, 635 nm Write (NA = 0.6) /
650 nm (NA = 0.6) Read, linear velocity 3.5 m /
As a result of evaluating the data error after correction once (/ 1 ECC) and the data error after correction twice (/ 1 ECC) in s, the result shown in Comparative Example 2 in FIG. 3 was obtained. FIG. 4 shows a write strategy at the time of recording.

As shown in the result of Comparative Example 1 in FIG. 3, the data error after one-time correction is as large as “120”,
The data error after the first correction is "15", which is uncorrectable data.

[Comparative Example 2] An experiment of Comparative Example 2 was performed as a comparative object of Examples 8 and 9. In Comparative Example 2, the composition of the recording layer was Ge ₂ Sb ₂ Te ₂ , and the recording linear velocity was 5 m.
/ S was recorded. As shown in the results of Comparative Example 2 in FIG. 11, the storage capacity was 4 GB.

[Results of Examples and Comparative Examples] As shown in FIG. 3, by comparing Examples 1 to 7 with Comparative Example 1, the phase-change optical disks of Examples 1 to 7 were obtained. According to the recording method of (1), in a phase change optical disk provided with address information such as a header and a pre-pit, deterioration of marks in an area immediately after the start of recording is reduced, and errors in a medium (phase change optical disk) are reduced. It is possible.

FIG. 12 is an explanatory diagram showing the relationship between the maximum shift position and the jitter based on the evaluation results of Examples 1 to 7 shown in FIG. Thus, the effect of shifting the maximum mark length by X times (2 to 4 times) is more apparent.

Further, as shown in FIG.
By comparing with the comparative example 2, according to the recording methods of the phase-change optical disks of Examples 8 and 9, high sensitivity (recording power of 15 mW or less) and high density (linear density of 0.2 μm / bi) were obtained.
t, track pitch 0.7 μm).
It is possible to realize a high transfer rate.

[0080]

As described above, the recording method of the phase change type optical disk according to the present invention (claim 1), when recording the recording data, is at least twice the maximum mark length immediately after all the headers and pre-pits. After recording unspecified random data in the area, to record the recording data, in the phase change optical disk provided with address information such as header, pre-pit, etc., to reduce the deterioration of marks in the area immediately after the start of recording, It is possible to reduce errors of the medium (phase change optical disk).

The recording method of a phase change optical disk according to the present invention (claim 2) is characterized in that, when recording data is recorded, an area having at least twice the maximum mark length immediately after all headers and prepits is erased. In a phase change optical disk provided with address information such as headers and pre-pits for recording recording data, the deterioration of marks in the area immediately after the start of recording is reduced, and errors in the medium (phase change optical disk) are reduced. Can be planned.

Further, according to the recording method of a phase change type optical disk of the present invention (claim 3), when recording the recording data, the recording is not performed in an area more than twice the maximum mark length immediately after the header and prepit at the recording start position. After recording specific random data, the recording data is recorded. Therefore, in a phase change optical disk provided with address information such as a header and pre-pits, deterioration of marks in an area immediately after the start of recording is reduced, and a medium (phase change) is used. (Optical disk) can be reduced.

Further, according to the recording method of a phase change type optical disk of the present invention (claim 4), at the time of recording data, the area at least twice the maximum mark length immediately after the header at the recording start position and immediately after the pre-pit is erased. After recording, in a phase change optical disk provided with address information such as headers and pre-pits, the deterioration of marks in the area immediately after the start of recording is reduced, and errors in the medium (phase change optical disk) are recorded. Reduction can be achieved.

Further, according to the recording method of the phase change type optical disk of the present invention (claim 5), when recording the recording data, the recording start position from immediately after all the headers and pre-pits is set to O / O.
For every W times (twice the Mode maximum mark length), the recording start position is increased or decreased by 1T from immediately after all headers and prepits to a position twice the maximum mark length. In a phase change optical disk provided with address information such as the above, it is possible to reduce the deterioration of marks in an area immediately after the start of recording, and to reduce errors in a medium (phase change optical disk).

Further, according to the recording method of a phase change type optical disk of the present invention (claim 6), when recording the recording data, the recording start position immediately after all the headers and pre-pits is set to O / O.
Every W times (twice the Mode maximum mark length), the recording start position is increased or decreased by 1T from immediately after all headers and prepits to a position three times the maximum mark length. In a phase change optical disk provided with address information such as the above, it is possible to reduce the deterioration of marks in an area immediately after the start of recording, and to reduce errors in a medium (phase change optical disk).

Further, according to the recording method of a phase change type optical disk of the present invention (claim 7), when recording the recording data, the recording start position immediately after all the headers and prepits is set to O / O.
For every W counts (twice the Mode maximum mark length), the recording start position is increased or decreased by 1T from immediately after all headers and prepits to a position four times the maximum mark length. In a phase change optical disk provided with address information such as the above, it is possible to reduce the deterioration of marks in an area immediately after the start of recording, and to reduce errors in a medium (phase change optical disk).

The recording method for a phase-change optical disk according to the present invention (claim 8) is the recording method for a phase-change optical disk according to any one of the first to seventh aspects. The main component of the layer material is at least A
Since g, In, Sb, and Te are included, high-sensitivity, high-density recording is possible.

The recording method of a phase change optical disk according to the present invention (claim 9) is the recording method of the phase change optical disk according to claim 8, wherein the recording / reproducing linear velocity at the time of recording the recording data is 3 or less. Since it is 15 m / s, a high transfer rate can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a layer structure of a phase change optical disc used in Examples 1 to 9.

FIG. 2 is an explanatory diagram illustrating a relationship between recording of random data (corresponding to a prewrite signal), recording timing of recording data, and a recording position in the first embodiment.

FIG. 3 is an explanatory diagram showing evaluation results of each example (Examples 1 to 7) and Comparative Example 1.

FIG. 4 is an explanatory diagram showing a write strategy at the time of recording.

FIG. 5 is an explanatory diagram showing a relationship between erasure of an area (corresponding to a play raise signal) and recording timing and recording position of recording data in a second embodiment.

FIG. 6 is an explanatory diagram showing a relationship between recording of random data (corresponding to a prewrite signal), recording timing of recording data, and a recording position in a third embodiment.

FIG. 7 is an explanatory diagram showing a relationship between erasure of an area (corresponding to a play raise signal) and recording timing and recording position of recording data in a fourth embodiment.

FIG. 8 is an explanatory diagram showing a relationship between a recording start position (corresponding to a recording start position signal) and recording timing of recording data in a fifth embodiment.

FIG. 9 is an explanatory diagram illustrating a relationship between a recording start position (corresponding to a recording start position signal) and recording timing of recording data in a sixth embodiment.

FIG. 10 is an explanatory diagram showing a relationship between a recording start position (corresponding to a recording start position signal) and recording timing of recording data in a seventh embodiment.

FIG. 11 is an explanatory diagram showing evaluation results of each example (Examples 8 and 9) and Comparative Example 2.

FIG. 12 is an explanatory diagram showing a relationship between a maximum shift position and jitter.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 phase change optical disk 101 substrate 102 lower protective layer 103 recording layer 104 upper protective layer 105 heat radiation layer 106 UV protective layer

Claims (9)

[Claims] 1. A recording method of a phase-change optical disc for recording record data on a phase-change optical disc provided with address information such as a header and pre-pits, wherein all the headers, A recording method for a phase-change optical disk, comprising: recording unspecified random data in an area at least twice the maximum mark length immediately after prepits; and then recording the recording data. 2. A phase change optical disk recording method for recording data on a phase change optical disk provided with address information such as headers and pre-pits, wherein all the headers, A recording method for a phase-change optical disk, comprising: erasing an area at least twice the maximum mark length immediately after a pre-pit, and then recording the recording data. 3. A recording method for a phase-change optical disc which records data on a phase-change optical disc provided with address information such as a header and pre-pits. A recording method for a phase-change optical disc, comprising recording unspecified random data in an area at least twice the maximum mark length immediately after a header and a prepit, and then recording the recording data. 4. A recording method of a phase change optical disc for recording record data on a phase change optical disc provided with address information such as a header and a pre-pit. A recording method for a phase change optical disk, comprising: erasing an area at least twice the maximum mark length immediately after a header and a prepit, and then recording the recording data. 5. A phase change optical disk recording method for recording recording data on a phase change optical disk provided with address information such as headers and pre-pits, wherein all the headers, The recording start position immediately after the pre-pit is set to the O / W count (Mode
A phase change optical disk characterized in that the recording start position is increased or decreased by 1T from immediately after all headers and pre-pits to a position twice as large as the maximum mark length for each (double the maximum mark length), and recorded. Recording method. 6. A recording method of a phase change optical disc for recording recording data on a phase change optical disc provided with address information such as headers and pre-pits, wherein all the headers, The recording start position immediately after the pre-pit is set to the O / W count (Mode
A phase change optical disk characterized in that the recording start position is increased or decreased by 1T from immediately after all headers and pre-pits to a position three times the maximum mark length for each (two times the maximum mark length), and recorded. Recording method. 7. A phase change optical disk recording method for recording recording data on a phase change optical disk provided with address information such as headers and pre-pits, wherein all the headers, The recording start position immediately after the pre-pit is set to the O / W count (Mode
A phase change optical disk characterized in that the recording start position is increased or decreased by 1T from immediately after all headers and pre-pits to a position four times the maximum mark length for each (double the maximum mark length), and recorded. Recording method. 8. The phase-change optical disk according to claim 1, wherein the main component of the material of the recording layer of the phase-change optical disk includes at least Ag, In, Sb, and Te. Optical disc recording method. 9. The recording method for a phase-change optical disk according to claim 8, wherein the recording / reproducing linear velocity when recording the recording data is 3 to 15 m / s.