JP2000195055A - Method for recording optical disk, optical disk and optical disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent signals recorded to an optical disk from being deteriorated even when the optical disk has a narrowed track pitch and even when a circumferential light of an optical beam spot partly erases record marks of adjacent tracks. SOLUTION: An optical disk 400 is provided with an area for storing the number of recording times of a manage area, so that signals recorded to the manage area are rerecorded for every predetermined number of recording times. According to the method for recording the optical disk, even when a beam spot becomes off track thereby partly erasing signals of an adjacent track, information of the adjacent track is reproduced immediately after recorded, and rerecorded to the adjacent track in a constitution of the apparatus.

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 which is adapted to a narrow track pitch by irradiating a recording material thin film formed on a substrate with a high energy beam such as a laser beam, an optical disk and an optical disk apparatus. It is about.

[0002]

2. Description of the Related Art In recent years, optical disks capable of recording, reproducing, and erasing information, and optical disk devices for recording and reproducing this optical disk have been commercialized. Further, research and development of a high-density rewritable optical disk and an optical disk device capable of recording and reproducing a high-quality moving image have been actively performed.

As a rewritable optical disk, for example, a Ge-Sb-Te or In-S
A phase change optical disk having a chalcogenide thin film such as b-Te and a magneto-optical recording medium having a metal thin film such as Fe-Tb-Co as a recording layer are known.

In a phase change optical disk, for example, a recording laser beam is irradiated to a recording thin film layer made of the above phase change material, and the irradiated portion is locally heated to a predetermined temperature. The irradiated portion is converted to a crystalline state when the ultimate temperature is equal to or higher than the crystallization temperature, and is converted to an amorphous state when rapidly cooled after melting beyond the melting point. Either the amorphous state or the crystalline state is defined as a recorded state or an erased state (unrecorded state), and reversible recording or erasing of information is repeatedly performed by forming a pattern corresponding to an information signal. Optical characteristics are different between the crystalline state and the amorphous state, and a signal can be reproduced by optically detecting a change in reflectance or a change in transmittance using the difference in the characteristics.

In a magneto-optical recording medium, for example, a laser beam focused on a magneto-optical recording thin film is irradiated and locally heated to a predetermined temperature. By applying a magnetic field simultaneously with the heating and inverting the magnetization direction of the magneto-optical recording thin film in accordance with the information, recording or erasing of information is repeatedly performed.

In the above-described optical disk, a guide groove having an uneven shape is formed in advance (hereinafter, may be referred to as a guide track).
Are formed on the substrate to form information tracks. Further, a portion closer to the light incident side is called a groove, and a portion farther from the side is called a land. Recording or reproduction of an information signal is performed by converging and scanning a laser beam on a groove or a land. This information signal is called user data in the sense that it can be recorded by the user himself.

Further, recently, as a means for increasing the recording capacity of an optical disk, an optical disk using a technique of increasing the track density by recording an information signal on both a groove track and a land track of the optical disk is being marketed. is there.

Hereinafter, a conventional optical disk having a signal recorded on an information track and an optical disk apparatus for recording information on the optical disk will be described with reference to the drawings.

FIG. 9 is a block diagram showing an outline of a conventional optical disk device. An information track 801 including an uneven guide groove is formed on an optical disc 800.

FIG. 6 is an enlarged view of the information track 801. The information track 801 includes a groove track 601 and a land track 602. In FIG. 6, the recording mark 603 is formed on both the groove track 601 and the land track 602, and the beam spot 604 scans the groove track 601 or the land track 602 in the direction of the arrow.

FIG. 7 is an enlarged view of an information track of an optical disk when data is recorded only in a groove. The recording mark 703 is formed on the groove track 701, and the beam spot 604 is
1 is scanned in the direction of the arrow.

Referring to FIG. 9, an operation for recording and reproducing information on the optical disk 800 will be described.

The optical disk 800 has a spindle motor 8
02 rotates at a predetermined speed. When playing the information,
A light beam 803 emitted from the optical head 804 is emitted by the recording circuit 805 at a reproducing power. Servo circuit 806
Controls the optical head 804, and the light beam 803 is focused on the groove track 601 or the land track 602 shown in FIG. The light beam 803 reflected from the information track 801 is converted into an electric signal by the optical head 804 and output to the reproducing circuit 807. Reproduction circuit 807
Reproduces an information signal and a servo signal from the output signal of the optical head. The servo circuit 806 controls the optical head 804 using the servo signal of the reproduction circuit 807. The demodulation circuit 808 reproduces information recorded on the optical disc 800 using the information signal of the reproduction circuit 807. The reproduced signal is sent to the controller 809 and then output to the host computer 810. Also, the controller 809
Are the reproduction circuit 807, the recording circuit 805, and the servo circuit 80
6, and the demodulation circuit 808. With the above control, the information on the optical disc 1 is reproduced.

At the time of recording information, the intensity of the light beam 803 is modulated by the recording circuit 805 and the information track 80 is recorded.
1, information is recorded.

[0015]

However, when information is recorded using the optical disk and the optical recording device as described above, when the track pitch becomes narrow, the light around the beam spot 604 is irradiated to the adjacent track. , And the temperature of the adjacent track is easily increased. For example, in a phase change rewritable optical disk, the recording mark is generally amorphous, but the amorphous mark may be gradually crystallized by increasing the temperature by recording the adjacent track many times. there were. As a result, there has been a problem that information is lost or the signal quality of the information is deteriorated (hereinafter, referred to as adjacent erasure).

The beam spot 604 is controlled so as to scan the center of the ordinary land track 601 or the groove track 602. However, the beam spot 602 may scan a position offset from the track center (hereinafter, referred to as off-track) due to disturbance due to impact or the like. With this off-track,
There has been a case where the peripheral portion of the beam spot 604 is irradiated to an adjacent track and is erased adjacently.

Therefore, the above-described adjacent erasure may limit the narrowing of the track pitch of the optical disk. According to the study by the present inventors, the wavelength 650 n
m semiconductor laser and NA 0.60 optical head 803,
A groove track 601 and a land track 602 each have a linear velocity of 8 m on an optical disc 800 having a width of 0.6 μm.
After recording on the groove track 601 at / s, the land track 602 was repeatedly recorded about 100,000 times, and the signal level of the previously recorded groove track 601 was measured. As a result, the carrier level may be reduced by about 3 dB from the initial stage. When the beam spot 604 is off-track from the track center by 0.1 μm, the carrier level of the signal of the adjacent track may be reduced by about 1 to 2 dB by about 1,000 recordings.

However, in a normal optical disk, 1
In most cases, the same track is repeatedly recorded 000 times or more only when the user data management area on the optical disk is rewritten. As the user data management area, for example, MS-DOS or Wi-Fi used as a file management area of a personal computer is used.
Windows FAT and various OS (Operating System
System) There is a commonly used format such as UDF. In these formats, only a small part of the track is frequently and repeatedly recorded, and the track adjacent to this track is hardly re-recorded in many cases. As a result, adjacent erasure occurs, and the quality of the signal recorded on the adjacent track deteriorates. A general optical disk device has an error correction function (ECC) for partial signal deterioration, and a signal can be reproduced by this function. However, as described above, when the adjacent track is hardly re-recorded, the signal quality of most of the adjacent track is deteriorated, and it may not be possible to reproduce the data by the ECC.

Therefore, according to the present invention, when a same track is recorded many times on a disk having a narrow track pitch,
Alternatively, when an off-track occurs, an object of the present invention is to eliminate the signal of an adjacent track or to compensate for a decrease in signal quality.

[0020]

According to the present invention, there is provided an optical recording method for recording information on an optical disk provided with a rewritable recording thin film on a disk substrate on which uneven recording tracks are formed in advance. A rewriting information indicating the number of times the signal has been rewritten in a part of the signal to be recorded on the optical disc, and when the rewriting information is a certain value or more, the rewriting information is a certain value or more. At least both tracks adjacent to the track are re-recorded.

Further, the optical disc is provided with a management area for recording position information of recording data, and a part of the signal recorded in the management area includes information indicating the number of times the signal has been rewritten, and the information is constant. When the rewrite information is equal to or more than the value, the rewrite information is re-recorded on at least both adjacent tracks of the tracks having the value equal to or more than a certain value.

According to another aspect of the present invention, there is provided an optical disk having a rewritable recording thin film on a disk substrate on which uneven recording tracks are formed in advance. And a signal recorded on a track in the management area contains information indicating the number of times the recording track has been rewritten.

According to another aspect of the present invention, there is provided an optical disc apparatus for recording an optical disc provided with a rewritable recording thin film on a disc substrate on which uneven recording tracks are formed in advance. Off-track detecting means for scanning the recording track with a laser beam with the focused beam spot and detecting the amount of off-track between the recording track and the beam spot; and modulating the irradiation intensity of the beam spot to the recording track. There is a recording means for irradiating on the top, while recording a signal on a recording track by the recording means, detecting an off-track amount by an off-track detecting means, and when the off-track amount is a certain value or more, the The apparatus is configured to control so that at least both tracks adjacent to the recording track are re-recorded.

Alternatively, there is provided an optical disk apparatus for recording an optical disk provided with a rewritable recording thin film on a disk substrate on which a recording track having irregularities is formed in advance, wherein a focused beam spot scans the recording track, There are recording means for modulating the irradiation intensity of the beam spot and irradiating the recording track, and disturbance detecting means for detecting disturbance such as an impact applied to the optical disk device. The disturbance detecting means detects the magnitude of the disturbance, and when the magnitude of the disturbance is equal to or larger than a predetermined value, the apparatus is configured to control so as to re-record at least both adjacent tracks of the recording track.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disc and a recording method for the optical disc according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing an outline of an optical disk apparatus for recording and reproducing an optical disk according to the present embodiment. An information track 2 is formed on an optical disc 1. The recording method of the information track 2 may be a method of recording on both the groove track and the land track as shown in FIG. 6, or one of the groove track and the land track (FIG. 7) as shown in FIG. Indicates the case of groove track recording)
May be recorded. Also, the optical disk 1
Is a recording layer whose state changes reversibly by absorbing laser light to record information on a substrate made of a resin material such as polycarbonate, or a glass material, and a dielectric layer that protects this recording layer , And a reflection layer for reflecting a laser beam are sequentially provided, and an overcoat or a protection plate is bonded to this.

FIG. 2 is an explanatory diagram showing an example of a recording area of the optical disc 1 and a recording signal sequence. FIG. 1 shows a case where the optical disc 1 is provided with a user data area 201, a user data management area 202, and a disc management area. The user data area 201 is an area for recording information (files and folders) that the user actually wants to save, and occupies most of the area of the optical disc. The user data management area 202 is an area for recording information for managing in which area of the optical disc the file or folder is recorded, or the connection state of the recorded area. Windows used in personal computers
The FAT of ws or the like corresponds to the user data management area, which is usually 1% or less of the entire recording area of the optical disc 1. In the disk management area 207, information on the type of the optical disk 1 and the recording / reproducing conditions is recorded in advance on the substrate as pits on unevenness. Reference numeral 203 denotes a management area recording signal sequence showing an example of a format of a recording signal of an information track located in the management area 202. In the present embodiment, it is assumed that the management area recording signal sequence 203 includes synchronization data 204, recording count data 205 (= n), and management data 206. The synchronization data 204 is a reference signal that is synchronized when the demodulation circuit 8 demodulates the management area recording signal sequence 203. The recording count data 205 is a signal indicating the track rewrite count (n). The management data 206 is a signal indicating information on a position and a connection state of files and data in the user data area.

The optical disk 1 divided into areas as shown in FIG. 2 is rotated at a predetermined speed by a spindle motor 11 in FIG. When information is reproduced, the light beam 3 emitted from the optical head 4 is emitted by the recording circuit 5 with reproduction power. The optical head 4 is controlled by the servo circuit 6, and the light beam 3 is focused on the information track 2. The light beam 3 reflected from the information track 2 is converted into an electric signal by an optical head 4 and output to a reproducing circuit 7. The reproduction circuit 7 reproduces an information signal and a servo signal from an output signal of the optical head 4. The servo circuit 6 controls the optical head 4 by using the servo signal of the reproducing circuit 7 and causes the light beam 3 to scan on the information track. The demodulation circuit 8 reproduces information recorded on the optical disc 1 using the information signal of the reproduction circuit 7. The demodulated signal is sent to the controller 9 and then output to the host computer 12. Also, the controller 509
Are the reproduction circuit 507, the recording circuit 505, and the servo circuit 50
6, and the demodulation circuit 508.

The recording number detection circuit 10 reproduces the recording number data 205, thereby obtaining the user data management area 2
02 and the number of repetitive recordings (= n) are identified. Information on the number of recordings obtained by the recording number detection circuit 10 is output to the controller 9. The counter 13 adds the number n of times of repeated recording.

Next, the procedure for recording the optical disk of FIG. 2 on the optical disk of FIG. 1 will be described with reference to the flowchart of FIG.

In FIG. 3, a start command 30 for recording information is sent from the host computer 12 to the controller 9, and
The recording / reproducing operation of the optical disk device starts. First, in the recording start position setting step 31, the controller 9 determines a data recording position based on information in the user data management area 202. Based on the information in the recording start position setting step 31, in the search command 32, the controller 9 outputs a search command to the servo circuit 6, and moves the optical head 4 so that the light beam 3 scans a predetermined track to perform tracking control. I do. In the recording start position confirmation step 33, information on the area where the light beam 3 is scanning is obtained by a signal reproduced from the track scanned by the light beam through the reproduction circuit 7 and the detection circuit 8. The user data management area determination 34 determines whether the track scanned by the light beam 4 is the user data management area 202 based on the area information obtained in step 33.

The processing performed when the recording position is determined to be in the user data management area 202 in the user data management area determination 34 will be described below. Recording frequency detection process 3
At 5, the demodulation circuit 8 demodulates the recording number data 205 of the track to be recorded, and obtains the recording number n. In the addition step 36, the counter 13 performs an addition process of adding 1 to the number of recordings n. In the user data management area recording step 37, the recording circuit 5 modulates the irradiation intensity of the light beam 3 based on the recording information of the controller 9, and records the management area recording signal sequence 203 on a predetermined track. Based on the value of n added in the addition step 36, a re-recording setting value determination 38 determines whether the value of the number of recordings n is equal to or greater than the re-recording setting value m. As the re-recording set value m, the limit number of repetitions that can be demodulated in adjacent track recording is set. For example, if the limit number of repetitions is 100,000, m may be set to a value of 100,000 or less.

Further, a case where it is determined in the re-recording set value judgment 38 that n has exceeded the re-recorded set value m will be described. In the adjacent track reproduction step 39, the tracks on both sides of the track recorded in the user data management area recording step 37 are reproduced to obtain information on the signal of the adjacent track.
Next, in an adjacent track recording step 40, the reproduction information obtained in the adjacent track reproduction step 39 is re-recorded on the original adjacent track. In a recording number reset step 41, the recording number n is reset (n = 1), and the recording process is terminated.

When the recording start position is judged to be the user data area 201 in the user data management area judgment 34, the irradiation intensity of the light beam 3 is recorded by the recording circuit 5 based on the recording information of the controller 9 in the user data recording step 42. Is modulated, user data is recorded on a predetermined track, and the process is terminated.

If it is determined in the re-recording setting value judgment 38 that the number of recordings n is equal to or less than the re-recording setting value, the recording is terminated.

As described above, in the procedure shown in FIG. 3, when only a specific track of the user data management area 202 is repeatedly recorded, an adjacent track is re-recorded every predetermined number of recordings. By this recording operation,
Even if the recording marks on the adjacent tracks are gradually erased, they are reformed before the signal quality deteriorates. As a result, the signal quality of the signal of the adjacent track is maintained.

In this embodiment, the case where only a specific track in the user data management area is re-recorded has been described, but the invention is not limited to this. The entire user data management area may be re-recorded, or may be re-recorded in fixed block units. In this case, the recording signal quality of the entire predetermined area is maintained.

(Embodiment 2) Next, an optical disk device according to Embodiment 2 will be described.

FIG. 4 is a block diagram of an optical disk device according to the second embodiment. The optical disc 400 is rotated at a predetermined angular velocity or linear velocity by the spindle motor 401. As described above with reference to FIG. 1, the optical disc 400 may be one having the tracks shown in FIG. 6 or FIG. Further, the optical disk 400 may have the same thin-film lamination structure as the optical disk described in the first embodiment.

Referring to FIG. 4, an operation for reproducing information recorded on the optical disk 400 will be described. The host computer 426 outputs an information recording / reproducing command to the controller 418. The laser drive circuit 425 receives the signal L1 from the controller 418, enters the reproduction mode, outputs a drive current to the semiconductor laser 410, and emits light at a constant reproduction intensity.

Next, position control of the focus direction (focus direction) of the beam spot is performed. A general focus control method such as a spot size method or an astigmatism method may be used. Omitted.

The laser light emitted from the semiconductor laser 410 is focused on the information track 402 by the objective lens 411. The laser beam reflected by the information track 402 is incident on the photodetector 412 after information on the information track 402 is given by the distribution of the amount of reflected light. The light receiving units 412a and 412b convert the change in the light amount distribution of the incident light beam into an electric signal and output the electric signal to the differential amplifier 415 and the addition amplifier 421, respectively. The differential amplifier 415
After each input current is converted to a voltage, a differential is obtained and output to a LPF (Low Pass Filter) 416 as a difference signal. The LPF 416 extracts a low-frequency component from the difference signal and outputs it as a tracking signal S1 to the tracking signal amplitude detection circuit 417 and the tracking control circuit 419.

The tracking signal amplitude detection circuit 417
From the amplitude value of the signal S1, a fluctuation value (hereinafter, referred to as an off-track amount) of the beam spot 402 with respect to the center of the information track 402 in the radial direction of the optical disc 1 is detected and output to the controller 418 as a signal S2.

When recording is performed on both a groove track and a land track as shown in FIG. 6, the tracking control circuit 419 inverts the polarity of the tracking signal S1 and performs tracking to a target track. Further, it outputs a tracking drive signal to the actuator drive circuit 420 according to the level of the input tracking signal S1. The actuator drive circuit 420 outputs a drive current to the actuator 413 in accordance with the tracking drive signal, and moves the objective lens 411 in a direction crossing the information track 401. With this control, the beam spot 402 can scan the center of the groove or land on the information track.

When the light beam 403 scans the information track 402 correctly, the amount of reflected light changes due to the recording mark 603 or the recording mark 703 (see FIGS. 6 and 7), and the level of the output signal of the light receiving sections 412a and 412b changes. change. This output signal is added by the addition amplifier 421 and output to the preamplifier 422 as a sum signal. Preamplifier 422
The signal amplified in (1) is demodulated into reproduction data by the reproduction signal processing circuit 423 and output to the controller 418.

On the other hand, during recording, the controller 4
A command L4 for scanning the track adjacent to the track to be recorded is sent to the tracking control circuit 419 from. The tracking control circuit 419 includes the actuator driving circuit 4
20 is controlled to scan the track recorded by the light beam 403.

Next, the laser drive circuit 425 receives the signal L1 from the controller 418 and enters the recording mode. At the same time, the recording signal processing circuit 424
And outputs a modulation signal to the laser drive circuit 425. Laser drive circuit 425
Modulates the drive current output to the semiconductor laser 410 according to the modulation signal. As a result, the intensity of the light beam 403 changes, and a recording mark is formed on the information track 402.

During recording on the information track 402, the tracking signal amplitude detection circuit 417 monitors the off-track amount of the light beam 403.

FIG. 5 shows the tracking signal S when the light beam 403 scans the information track 402.
1 shows a signal amplitude of 1. FIG. 5A shows a case where off-track hardly occurs during recording. In FIG. 5A, the track jump state period is a state in which the beam spot 403 is moving between tracks in order to reach a target track, and is excluded from the period for detecting the off-track amount. During the recording operation state period, the amplitude of the tracking signal S1 is equal to or less than the off-track detection level set in advance by the tracking signal amplitude detection circuit 417 in FIG. A signal S2 for determination is output. In this case, the controller 418
Ends the recording mode.

FIG. 5B shows a case where off-track occurs due to a disturbance such as an impact during recording. If the tracking signal amplitude S1 exceeds the off-track detection level within the recording operation state period, the tracking signal amplitude detection circuit 417 outputs a signal S2 for determining "abnormal" to the controller 418. In this case, there is a possibility that a partial signal quality of an adjacent track is reduced due to the occurrence of the off-track. Therefore, the controller 418 outputs a command to set the laser drive circuit 425 to the reproduction mode, and at the same time, outputs a command to scan the track adjacent to the recording track to the tracking control circuit 419, and according to the reproduction procedure described above, The beam 403 reproduces the signal of the adjacent track. A signal obtained by reproducing an adjacent track may be partially degraded. However, a general optical disk device has an error correction function (ECC), and reproduction can be performed by this function. Next, the reproduced information of the adjacent track is output as a signal L3 to the recording signal processing circuit 424, and is re-recorded on the original adjacent track. The recording signal processing circuit is operated by the laser driving circuit 4 according to the signal L3.
The modulation signal is output to 25. The laser drive circuit 425 is
The drive current output to the semiconductor laser 410 is modulated according to the modulation signal. As a result, the intensity of the light beam 403 changes, and the information originally recorded on the adjacent track is re-recorded.

Here, it is desirable that the re-recording of the adjacent track is performed for both adjacent tracks. If it can be determined that the track has been off-tracked on only one side, it is sufficient to re-record only on the adjacent track on one side. In the case of control for re-recording only one adjacent track, the re-recording operation is halved, and the recording control speed of the optical recording device is improved. The off-track direction may be determined from the positive or negative of the tracking signal amplitude shown in FIG.

In the above-described operation of the optical disk apparatus, even if the off-track amount of the beam spot 403 becomes large during recording and a part of the recording mark of the adjacent track is erased, the information of the adjacent track remains off. Since the recording is performed immediately after a track is generated, the data can be safely stored.

As a result, even in an optical disk having a narrow track pitch, signal deterioration due to adjacent erasure can be prevented, and an optical disk device capable of recording and reproducing a high-density optical disk can be provided.

If an off-track occurs during recording, there is a possibility that the signal itself of the recording track is not recorded with sufficient quality. In order to compensate for this, in addition to the above-described re-recording operation of the adjacent track, an operation may be performed to re-record a track to be originally recorded. In this case, there is an advantage that the signal quality of the recording track is improved.
The re-recording operation of the recording track may be performed before or after the re-recording operation of the adjacent track. This recording operation can also maintain the signal quality of the recording track.

In the optical disk apparatus of the present embodiment, the above-described recording control is described as an apparatus configuration that operates in any area on the optical disk, but the invention is not limited to this. For example, as described in the first embodiment, the above-described recording control may be performed only in the management area of the optical disc in which a specific information track is frequently rewritten. In this case, since the recording operation of the adjacent track information when recording the user data area can be omitted, there is an advantage that the recording operation is simplified and the recording control speed of the optical disk device is improved.

(Embodiment 3) Next, an optical disk apparatus which detects the magnitude of disturbance such as impact and compensates for signal deterioration due to adjacent erasure will be described.

FIG. X is a block diagram of the optical disk device according to the present embodiment. The components from the optical disc 400 to the laser drive circuit 425 constituting the optical disc apparatus of this figure can be the same as those in the second embodiment, and perform the same operations, so that the description is omitted here.
In the present embodiment, an acceleration sensor 900 is provided in the housing 901 of the optical disk device instead of the tracking signal amplitude detecting means. The acceleration sensor converts the signal into an electric signal corresponding to the magnitude of a disturbance such as an impact, and
18 is output. When a disturbance such as an impact is applied to the optical disk device, the position of the optical head fluctuates, and off-track of the light beam 403 occurs. Further, the off-track amount increases in response to an increase in impact. Therefore, when the degree of impact (for example, the acceleration G) becomes a certain value or more, it can be predicted that the off-track amount at which adjacent erasure occurs will be achieved. Therefore, by detecting the output value of the acceleration sensor 900 during the recording operation, it is possible to determine whether or not to re-record a track adjacent to the recorded track.

If the output value of the acceleration sensor 900 is lower than the preset detection level during the recording operation, the controller 418 determines that the recording has been normally performed, and ends the recording mode.

When the output value of the acceleration sensor 900 is equal to or higher than the detection level, the controller 418 determines that the recording has been performed abnormally. In this case, it is considered that adjacent erasure has occurred due to the occurrence of off-track, and partial signal quality of the adjacent track has deteriorated. Therefore, the controller 418 outputs a command to set the laser drive circuit 425 to the reproduction mode, and at the same time, outputs a command to scan the track adjacent to the recording track to the tracking control circuit 419, and according to the reproduction procedure described above, The beam 403 reproduces the signal of the adjacent track. A signal obtained by reproducing an adjacent track may be partially degraded. However, a general optical disc device has an error correction function (EC
C) is mounted, and reproduction is possible by this function. Next, the reproduced information of the adjacent track is output as a signal L3 to the recording signal processing circuit 424 for re-recording on the original adjacent track. The recording signal processing circuit outputs the signal L
3 and outputs a modulation signal to the laser drive circuit 425. The laser drive circuit 425 modulates a drive current output to the semiconductor laser 410 according to the modulation signal. As a result, the intensity of the light beam 403 changes, and the information originally recorded on the adjacent track is re-recorded.

In the operation of the optical disk apparatus described above, even if the off-track amount of the beam spot 403 becomes large during recording due to a disturbance such as an impact, and a part of the recording mark on the adjacent track is erased, the adjacent track may be erased. Track information can be safely stored because the apparatus is configured to re-record immediately after off-track occurs.

As a result, even in the case of an optical disk having a narrow track pitch, the provision of the disturbance detecting means by the acceleration sensor can prevent signal deterioration due to adjacent erasure and provide an optical disk device capable of recording / reproducing a high-density optical disk. .

Further, if an off-track occurs during recording, the signal of the recording track itself may not be recorded with sufficient quality. In addition to the above-described re-recording operation of the adjacent track, the track to be originally recorded is also recorded. It may be operated to re-record. In this case, there is an advantage that the signal quality of the recording track is improved. The re-recording operation of the recording track may be performed before or after the re-recording operation of the adjacent track. This recording operation can also maintain the signal quality of the recording track.

In the optical disk apparatus of the present embodiment, the above-described recording control is described as an apparatus configuration that operates in any area on the optical disk, but the invention is not limited to this. For example, as described in the first embodiment, the above-described recording control may be performed only in the management area of the optical disc in which a specific information track is frequently rewritten. In this case, since the recording operation of the adjacent track information when recording the user data area can be omitted, there is an advantage that the recording operation is simplified and the recording control speed of the optical disk device is improved.

Although the above embodiment has been described using an optical disc, the above-described technique is applied to other forms of recording methods, recording devices, and recording media such as a card shape, a tape shape, and a drum shape for performing recording and reproduction according to the same principle. Applying is within the scope of the present invention.

[0065]

According to the optical disc of the present invention, the signal recorded in the management area is re-recorded every predetermined number of recordings by providing an area for storing the number of recordings in the management area. Signal deterioration of the adjacent track due to the repetitive recording of the track can be prevented.

In the optical disk device of the present invention, even when the beam spot goes off-track and a part of the signal of the adjacent track is erased, the information of the adjacent track is reproduced immediately after recording, and this information is transferred to the adjacent track. The recording / reproducing of an optical disk having a narrow track pitch is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of an apparatus for recording and reproducing an optical disc according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram showing an example of an area division of an optical disc and a format of a recording signal according to the first embodiment of the present invention;

FIG. 3 is a flowchart showing a procedure for recording on the optical disc according to the first embodiment;

FIG. 4 is a block diagram of an optical disc device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a tracking signal amplitude.

FIG. 6 is an enlarged sectional perspective view of an information track when information is recorded on both a groove track and a land track.

FIG. 7 is an enlarged cross-sectional perspective view of an information track when information is recorded on one of a groove track and a land track.

FIG. 8 is a block diagram of an optical disc device according to Embodiment 3 of the present invention.

FIG. 9 is a block diagram showing a conventional optical disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Information track 3 Light beam 4 Optical head 8 Demodulation circuit 10 Recording number detection circuit 13 Counter 201 User data area 202 User data management area 203 User data management area Recording signal sequence 205 Recording number data 400 Optical disk 401 Spindle motor 402 Information track 403 Beam spot 410 Semiconductor laser 411 Objective lens 412 Photodetector 412a, 412b Light receiving unit 413 Actuator 414 Optical head 415 Differential amplifier 417 Tracking signal amplitude detection circuit 418 Controller 419 Tracking control circuit 601 Groove track 602 Land track 603 Recording mark 701 Groove Track 703 Recording mark 900 Accelerometer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 21/08 G11B 21/08 A 27/00 27/00 D (72) Inventor Naoyasu Miyagawa Kadoma, Osaka 1006 Kadoma Ichidai Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D088 MM01 PP02 QQ06 UU10 5D090 AA01 BB04 CC02 CC05 CC18 DD03 FF09 HH01 5D110 AA17 CA02 CB04 CB06 CC06

Claims (12)

[Claims] 1. A method for recording information on an optical disk provided with a rewritable recording thin film on a disk substrate on which recording tracks having irregularities are formed in advance, wherein the information indicates the number of times a signal recorded on the optical disk has been rewritten. A recording method for an optical disc, wherein rewriting information is detected, and when the rewriting information is equal to or more than a certain value, at least both adjacent tracks of tracks having the rewriting information equal to or more than a certain value are re-recorded. 2. The optical disc according to claim 1, further comprising a management area for recording position information, connection information, and the like of the recording data, and information indicating the number of times a signal is rewritten to a part of the signal recorded in the management area. 2. The recording method for an optical disk according to claim 1, wherein when the information is equal to or more than a certain value, at least both tracks adjacent to the track whose rewriting information is equal to or more than a certain value are re-recorded. 3. An information rewritable recording thin film on a disk substrate on which uneven recording tracks are formed in advance, and a management area for recording position information of recording data on the recording tracks. An optical disc in which a signal recorded on a track in an area is provided with information indicating the number of times the information on the track has been rewritten. 4. An optical disk apparatus for recording on an optical disk having a rewritable recording thin film on a disk substrate on which uneven recording tracks are formed in advance, and rewriting information indicating the number of times of rewriting of signals on the recording tracks, A recording frequency detecting unit for detecting rewriting information and judging whether the rewriting information has a predetermined value; and a counting unit for adding the rewriting information every time the recording track is recorded, An optical disk apparatus for re-recording at least tracks on both sides of the recording track when the means detects a predetermined number of rewrites or more. 5. An optical disk apparatus for recording an optical disk provided with a rewritable recording thin film on a disk substrate on which recording tracks having irregularities are formed in advance, wherein a focused beam spot scans the recording tracks, Off-track detection means for detecting the tracking error amount between the recording track and the beam spot, and recording means for modulating the irradiation intensity of the beam spot, wherein the tracking error amount during the operation of the recording means is detected by the off-track detection means. Detect
When the tracking error amount is equal to or more than a predetermined value, an optical disc apparatus that re-records at least one of tracks adjacent to the recording track. 6. The optical disk apparatus according to claim 5, wherein a recording track is re-recorded before re-recording an adjacent track. 7. The optical disk apparatus according to claim 5, wherein after the adjacent track is re-recorded, the recording track is further re-recorded. 8. The re-recording of an adjacent track or the re-recording of a recording track is performed in a management area for recording position information of recording data provided on an optical disk.
An optical disc device according to any one of the above. 9. An optical disk apparatus for recording an optical disk provided with a rewritable recording thin film on a disk substrate on which recording tracks having irregularities are formed in advance, wherein a focused beam spot scans the recording tracks, Recording means for modulating the irradiation intensity of the beam spot, and acceleration detection means for detecting the acceleration of the optical disk device, wherein the acceleration while the recording means is operating is detected by the acceleration detection means,
An optical disc device for re-recording at least one of tracks adjacent to the recording track when the magnitude of the acceleration is equal to or more than a predetermined value. 10. The optical disk device according to claim 9, wherein a recording track is re-recorded before re-recording an adjacent track. 11. The optical disk device according to claim 9, wherein the recording track is re-recorded after re-recording the adjacent track. 12. The recording medium according to claim 9, wherein re-recording of an adjacent track or re-recording of a recording track is performed in a management area provided on the optical disc for recording positional information of recording data. An optical disk device as described in the above.