JPH087276A - Optical disc device recording method, optical drive method, and optical disc device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a recording method in which data is not destroyed even when the start end and the end of a recording area are deteriorated when repeatedly recording data on an optical disc. [Structure] When data is recorded on an optical disc having a recording area for recording data, pseudo data 21 and 25, which do not need to be reproduced as information, are added and recorded at the start and / or end of the recorded data.

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 an optical disk device for optically recording and reproducing.

[0002]

2. Description of the Related Art In recent years, an optical disk device has been actively developed as a means for recording / reproducing a large amount of data.

An example of the recording / reproducing method of the above-mentioned conventional optical disk device will be described below with reference to the drawings.

FIG. 3 is a block diagram of a recording / reproducing system of a conventional optical disk device. In FIG. 3, 39 is an optical disk. Reference numeral 310 is a laser drive circuit. 32 is an optical head. Reference numeral 34 is a reproducing circuit. 36 is a PLL (Ph
an as Locked Loop) circuit.

At the time of recording, a recording data signal 31 is input to the laser drive circuit 310, and an output signal 311 is input to the optical head 32. FIG. 4 shows a format of recording data when recording in one sector. The recording data can be roughly divided into a sync pull-in pattern 41 and a data section 43.
become. The synchronization pull-in pattern 41 is a pattern of a single cycle required when the PLL circuit 36 performs the synchronization pull-in.

During reproduction, the output signal 33 of the optical head 32
Is input to the reproduction circuit 34, and the signal 35 is output. The signal 35 is input to the PLL circuit 36, the sync pull-in pattern 41 is detected, and the data portion 43 is output as the reproduction data signal 38.

[0007]

When recording on a phase change optical disk, in the recording area, the recording power required to change the phase from the crystalline state to the amorphous state and the phase change from the amorphous state to the crystalline state are necessary. The recording is performed by modulating the laser with the binary value of the erasing power (corresponding to the 1 and 0 information of the data), and the laser is irradiated with the reproducing power except the recording area.

Normally, the recording power and the erasing power are much larger than the reproducing power, and the recording power is generally 10 m.
W to 20 mW, erasing power is about half of recording power,
The reproduction power is about 1 mW to 2 mW.

Therefore, in the structure of the conventional example, 100
When recording is repeatedly performed ten thousand times or more than ten million times, the portion where the recording film constituent material starts to deteriorate and moves from the start end of the sync pull-in pattern 41 and the end of the data part 43 where the thermal condition changes most rapidly in the optical disc 39. Had a problem that recording / reproducing of data could not be performed because the film thickness of the recording film changed.

In consideration of such problems in conventional repetitive recording, the present invention provides a recording method, an optical driving method, and an optical disc apparatus for an optical disc device in which necessary data is not destroyed even when the repetitive recording is performed. With the goal.

[0011]

According to the present invention, in a recording method of an optical disc apparatus for recording / reproducing on / from an optical disc having a recording area for recording data, pseudo data is added to a necessary start and / or end of data. This is a recording method of an optical disc device for recording by recording.

Further, the present invention is an optical drive method for an optical disk apparatus for recording / reproducing on / from an optical disk having a recording area for recording data, while recording pseudo data to be added to a required start and / or end of data, This is an optical drive method for an optical disk device in which the irradiation power of laser light is temporarily made lower than the erasing power.

Further, the present invention is an optical disc apparatus for recording / reproducing information on / from an optical disc having a recording area for recording data, in which laser light is temporarily recorded during recording of pseudo data to be added to a start end and / or end end of required data. The optical disk device is provided with an irradiation power changing means for making the irradiation power of light lower than the erasing power.

[0014]

According to the present invention, when data is repeatedly recorded, pseudo data is recorded in the deteriorated portion even if the deterioration due to the movement of the recording film constituent material starts from the start / end of the recording area. Data will not be corrupted.

Further, according to the present invention, the irradiation power of the laser beam is temporarily set to a power smaller than the erasing power during the recording of the pseudo data to create a region in which the thermal condition largely changes.
With this area, deterioration due to the movement of the recording film constituent substance that moves inward from the start / end of the recording area is reduced. This state is shown in FIG.

FIG. 8 shows one sector of the optical disc.
In FIG. 8, areas 811 and 812 are areas where the irradiation power of the laser beam is set to a power smaller than the erasing power during the recording of the pseudo data, and can be set at different positions each time recording is performed. The shaded area including the reproduction-only areas 81 and 83 is an area where laser light is emitted with a power smaller than the erasing power.

A read-only area 81 outside the recording area 82,
Since 83 is irradiated with the reproducing power even during recording, the recording film constituent substance does not melt, and when recording is repeatedly performed in the recording region 82, the recording film constituent substance at the outermost end of the start / end of the recording region 82. Are likely to move inside the recording area 82 (84, 810).

However, since the recording film constituent substances in the regions 811, 812 are irradiated with power lower than the erasing power, it is difficult to move, and the regions 811, 812 are recorded regions 8.
When the area is close to the start and end portions of No. 2, these areas serve as walls to reduce the inward movement of the start and end portions of the recording area 82.

Since the locations of the areas 811 and 812 are different for each recording, there is almost no deterioration due to the movement of the recording film constituent substance from both ends of the areas 811 and 812.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a recording / reproducing system of the optical disk device of the present invention. In FIG. 1, 19 is an optical disk. 110 is a laser drive circuit. Reference numeral 12 is an optical head. Reference numeral 14 is a reproducing circuit. Reference numeral 16 is a PLL circuit.

At the time of recording, the recording data signal 11 is input to the laser drive circuit 110, and the output signal 111 is input to the optical head 12. FIG. 2 shows a format of recording data when recording in one sector. The recording data is roughly divided into pseudo data 21, 25, a sync pull-in pattern 22, and a data section 24.

The pseudo data 21 and 25 are data that need not be reproduced as information. The amount of pseudo data is the start point after repeated recording under the specifications of the optical disc used.
Deterioration amount at the end (for example, recording 1 million times of random data causes 20 μm from the start to the inside of the recording area).
m, data such that the reproduction amplitude becomes smaller than the specified value from the end of the recording area to 30 μm inward)
In consideration of the above, the amount is set to be larger than the deterioration amount.

The synchronization pull-in pattern 22 is the PLL circuit 1
6 is a pattern of a single cycle necessary for performing the synchronization pull-in.

During reproduction, the output signal 13 of the optical head 12
Is input to the reproduction circuit 14, and the signal 15 is output. The signal 15 is input to the PLL circuit 16, the sync pull-in pattern 22 is detected, and the data portion 24 is reproduced data signal 1
It is output as 8.

As described above, according to the recording method of this embodiment, even if the recording is repeatedly performed, the deterioration of the start end of the recording area does not reach the sync pull-in pattern 22 and the end of the recording area is not reached under the specified conditions. Since the deterioration of No. does not reach the data section 24, the data can be recorded / reproduced correctly.

If the pseudo data 21 has a sync pull-in pattern, the time margin of the sync pull-in increases, which is more effective.

In this embodiment, the pseudo data is present at the beginning and end of the recorded data, but it may be present only at the beginning or at the end depending on the structure of the optical disc, the material constituting the recording film and the recording conditions.

Incidentally, as shown in FIG. 10, the recording data signal 1
If the recording start time control circuit 101 for randomly delaying 1 in each sector is provided for each recording, the start end portion of the pseudo data 21 and the pseudo data 2 in which the thermal condition changes most at the time of recording.
Since the position of the end portion of 5 changes randomly for each recording, the deterioration of the recording film can be further reduced.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram of a recording / reproducing system of the optical disk device of the present invention. 519 in FIG.
Is an optical disk. Reference numeral 51 is a recording gate generation circuit. Reference numeral 52 is an adiabatic pulse generation circuit. Reference numeral 53 is a recording signal generation circuit. 57 is an AND circuit. Reference numeral 59 is a laser drive circuit. 511 is an optical head. 513
Is a reproducing circuit. Reference numeral 516 is a PLL circuit.

FIG. 7 shows a timing chart for explaining each signal of the recording / reproducing system of the optical disc of this embodiment.

At the time of recording, a recording gate signal 54 is output from the recording gate generation circuit 51. The rising edge of the recording gate signal 54 determines the recording start time, and the falling edge determines the recording end time.

The recording gate signal 54 is input to the AND circuit 57 together with the signal 55 which is the output of the adiabatic pulse generation circuit 52, and the signal 58 is output. Adiabatic pulse generation circuit 52
As will be described later, the irradiation power of the laser beam is set to the reproduction power 7 during the recording of the pseudo data at the beginning and the end of the recording area.
5 is a circuit for generating a pulse for determining the time and time to be 5, and the start time of the pulse randomly changes within the pseudo data section for each recording.

The signal 58 is input to the laser driving circuit 59 together with the signal 56 which is the output of the recording signal generating circuit 53.

FIG. 6 shows a block diagram of the laser drive circuit 59 and the optical head 511. In FIG. 6, the optical head 511 includes a laser 64 and a light receiving element 65. Further, 61 of the laser driving circuit 59 is a reproduction power 7
5 is a current source for causing the laser 64 to emit light, and 62 is a current source for causing the laser 64 to emit with the erase power 74. At this time, the laser 64 flows through the current sources 61 and 62 2
Light is emitted with an erasing power 74 by combining two currents. 63
Is a current source for causing the laser 64 to emit light with the recording power 73. At this time, the laser 64 uses the current sources 61, 62, 6
Light is emitted at the recording power 73 by combining the three currents flowing through 3.

A switch 67 controls the current source 62. The switch 67 is turned on when the recording gate signal 58 rises. 68 is a switch for controlling the current source 63, and this switch 68 is turned on when the recording signal 69 rises.

The output signal 510 of the laser drive circuit 59 is input to the optical head 511. Reference numeral 71 in FIG. 7 shows the format of recording data when recording in one sector.
The recording data is roughly divided into pseudo data 76 and 710.
And a sync pull-in pattern 77 and a data portion 79.

The pseudo data 76 and 710 are data that need not be reproduced as information. The amount of pseudo data is 20 μm inward from the start end of the recording area due to the deterioration amount at the start end and the end due to repetitive recording under the specifications of the optical disc used (for example, recording 1 million times of random data)
m, data such that the reproduction amplitude becomes smaller than the specified value from the end of the recording area to 30 μm inward)
In consideration of the above, the amount is set to be larger than the deterioration amount.

The synchronization pull-in pattern 77 is the PLL circuit 5
16 is a pattern of a single cycle necessary for performing the synchronous pull-in.

The light modulation waveform 72 shows the irradiation power of the laser light for each area when the light spot passes through the track during recording. The section corresponding to section L of the signal 55 output from the adiabatic pulse generation circuit 52 is the laser 64.
Emits light with a reproduction power of 75.

During reproduction, the output signal 5 of the optical head 511
12 is input to the reproduction circuit 513, and the signal 514 is output. The signal 514 is input to the PLL circuit 516, the sync pull-in pattern 77 is detected, and the data portion 79 is output as the reproduction data signal 518.

As described above, according to the recording method of this embodiment, even if the recording is repeatedly performed, the deterioration of the start end of the recording area does not reach the sync pull-in pattern 77, and the deterioration of the end of the recording area does not occur in the data portion 79. Since it doesn't reach, it is possible to record and reproduce data correctly.

Further, according to the recording method of the present embodiment, during the recording of the pseudo data, the irradiation power of the laser beam is temporarily changed to the reproduction power to create an area where the thermal condition largely changes, and the area is used as the recording area. By reducing the movement of the recording film constituents that move inward from the beginning and end of the
Compared with the recording method of the above embodiment, the pseudo data can be reduced and the data portion can be increased.

In this embodiment, the irradiation power of the laser beam is temporarily set to the reproduction power during the recording of the pseudo data, but it is not limited to the reproduction power and may be a small power that reduces the movement of the recording film constituent material. The same effect can be obtained with any power.

In this embodiment, the irradiation power of the laser beam is temporarily set to the reproduction power at each of the start end and the end of the recording area, but depending on the structure of the optical disc, the recording film constituent material and the recording conditions. There may be only the start end or only the end, and there may be a plurality as long as the servo does not deviate.

In this embodiment, the laser light irradiation power at the beginning and the end of the recording area is always the same, but the same effect can be obtained by randomizing this time for each recording. To be

If the pseudo data 76 is a sync pull-in pattern, the time margin of the sync pull-in increases, which is more effective.

As shown in FIG. 11, signal 56 and signal 5
If the recording start time control circuit 101 that randomly delays 8 for each recording by the same time for each sector is provided, the positions of the start end portion of the pseudo data 76 and the end portion of the pseudo data 710 where the thermal conditions change most during recording are recorded. Since it changes randomly every time, the deterioration of the recording film can be further reduced.

The third embodiment of the present invention will be described below with reference to the drawings. The third embodiment differs from the second embodiment in that the signal 55 output from the adiabatic pulse generation circuit 52 in the second embodiment is changed to the signal 90 shown in FIG. The signal 90 is a signal such that there are a plurality of adiabatic sections for temporarily changing the irradiation power of the laser beam to the reproduction power during the recording of the pseudo data, and these sections are close to each other.

As in the present embodiment, the left adiabatic section is made long in the area of the pseudo data 76, the adjacent right adiabatic section is made short, and the right adiabatic section is made long in the area of the pseudo data 710.
When the adjacent left adiabatic section is shortened, the recording film constituent substance on the left side of the region 96 is unlikely to move to the right side as in the second embodiment, but the recording film constituent substance on the right side of the region 96 is changed to the region 96.
Since the right end of is slightly melted, let alone the right side,
You can also move to the left.

Therefore, similarly to the second embodiment, the movement of the recording film constituent substances starting from the left end to the right side of the pseudo data 76 can be reduced, and the movement from the right end of the region 96 to the right side can be reduced. Even if the number of recordings increases, it can be suppressed.

Similarly, by the area 97, the pseudo data 71
It is possible to further reduce the movement of the recording film constituent substance starting from the right end of 0 to the left side, and to suppress the movement of the region 97 from the left end to the left side.

As described above, this embodiment is more effective than the second embodiment when the number of repeated recordings is further increased.

[0054]

As described above, according to the present invention, by recording the pseudo data at the start and end portions of the record data, the necessary data can be recorded even if the deterioration is started from the start and end of the record data by repeatedly recording. It won't break.

Further, according to the present invention, by temporarily changing the irradiation power of the laser light to a power smaller than the erasing power during the recording of the pseudo data, an area where the thermal condition largely changes is created. Reduces degradation starting from the end.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / reproducing system of an optical disc according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a recording format in the embodiment.

FIG. 3 is a block diagram of a recording / reproducing system for a conventional optical disc.

FIG. 4 is a diagram showing a recording format in a conventional optical disc device.

FIG. 5 is a block diagram of a recording / reproducing system of an optical disc according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a laser drive circuit and an optical head in the same embodiment.

FIG. 7 is a timing chart of each signal of the recording / reproducing system of the embodiment.

FIG. 8 is a diagram showing a recording format in the embodiment.

FIG. 9 is a timing chart of a recording / reproducing system in a third embodiment of the present invention.

FIG. 10 is a block diagram of a recording / reproducing system of an optical disc according to the first embodiment of the present invention.

FIG. 11 is a block diagram of a recording / reproducing system of an optical disc according to a second embodiment of the present invention.

[Explanation of symbols]

 12 optical head 14 reproduction circuit 16 PLL circuit 21, 25 pseudo data 22 sync pull-in pattern 24 data part 51 recording gate generation circuit 52 adiabatic pulse generation circuit 59 laser drive circuit 101 recording start time control circuit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shunji Ohara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (9)

[Claims] 1. A recording method of an optical disk device for recording / reproducing on / from an optical disk having a recording area for recording data, wherein pseudo data is added and recorded at a start end and / or an end part of required data. Recording method for optical disk device. 2. A recording method for an optical disk device according to claim 1, wherein the pseudo data is formed into a pattern of a single period which is required when performing the synchronous pull-in. 3. An optical driving method for an optical disk device for recording / reproducing on / from an optical disk having a recording area for recording data, wherein the pseudo data to be added to the start and / or end of the required data is temporarily recorded. An optical drive method for an optical disk device, wherein an irradiation power of laser light is set lower than an erasing power. 4. The optical driving method for an optical disk device according to claim 3, wherein the time at which the irradiation power of the laser light is made lower than the erasing power is different for each recording. 5. The optical driving method of an optical disk device according to claim 3, wherein the time for which the irradiation power of the laser light is lower than the erasing power is different for each recording. 6. An optical disk device for recording / reproducing on / from an optical disk having a recording area for recording data, and temporarily irradiating laser light during recording of pseudo data to be added to a start end and / or an end end of required data. An optical disk device comprising an irradiation power changing means for making the power lower than the erasing power. 7. The irradiation power changing means determines a recording gate generation circuit for determining a recording start / end position of each sector, and a heat insulation for determining a time and a time for which the irradiation power of laser light is made lower than the erasing power during recording. A pulse generating circuit, an AND circuit that ANDs an output signal of the recording gate generating circuit and an output signal of the adiabatic pulse generating circuit, a recording signal generating circuit, an output signal of the AND circuit and the recording signal generation 7. A laser drive circuit that controls the irradiation power based on an output signal of the circuit.
The optical disk device described. 8. The optical driving method for an optical disk device according to claim 1, wherein the recording start time of the pseudo data is different for each recording. 9. The optical disk device according to claim 6, further comprising recording start time control means for changing the recording start time of the pseudo data for each recording.