JPH11317015A - Disk recording device and disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording device capable of efficiently recording data in the optical disk of a double spiral type. SOLUTION: An optical disk device 2 is provided with an input/output buffer 4 for storing data transferred from an external device at a transfer rate of Vb, a disk drive device 3 for recording data stored by the input/output buffer 4 in an optical disk 1 having two parallel-arranged recording tracks formed in spiral shapes at a writing rate Vt higher than the transfer rate Vb, and a controller 5 for switching recording tracks for data recording. The controller 5 records a data quantity for securing continuous data transfer by the writing rate Vt based on switching time generated when a recording track is switched to another and the transfer and writing rates Vb and Vt, and then switches the recording track to another for data recording.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording apparatus for recording data on a disk in which a plurality of recording tracks arranged in parallel are formed spirally or on a disk in which recording tracks are formed concentrically. The present invention relates to an apparatus and a disk reproducing apparatus for reproducing data from a disk in which a plurality of recording tracks arranged in parallel are formed in a spiral shape or a disk in which recording tracks are formed concentrically.

[0002]

2. Description of the Related Art Hitherto, an optical disk has been known as a recording medium on which program data, video data, audio data and the like are recorded. Generally, on this optical disk, one recording track is formed on a recording surface in a spiral shape, and data is sequentially recorded on this one recording track, for example, from the inner peripheral side to the outer peripheral side.

[0003]

In recent years, in order to increase the density of recording data, a so-called double spiral type is used, in which two recording tracks are formed on a recording surface in a spiral shape. Optical disks have been proposed.

[0004] However, in such a double spiral type optical disk, it has been difficult to efficiently switch two recording tracks to record data. Similarly, in such an optical disc, it is difficult to efficiently switch recording tracks and reproduce data.

Similarly, there has been proposed an optical disc having recording tracks formed concentrically on a recording surface.

However, in such an optical disc having recording tracks formed concentrically, it has been difficult to efficiently switch the recording tracks and record data. Similarly, in such an optical disc, it is difficult to efficiently switch recording tracks and reproduce data.

According to the present invention, recording tracks are switched efficiently between a disk having a plurality of recording tracks arranged in parallel and a recording track formed spirally or a disk having recording tracks formed concentrically. It is an object of the present invention to provide a disk recording device and a disk reproducing device capable of recording or reproducing data by using the same.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a disk recording apparatus according to the present invention is a disk recording apparatus for recording a plurality of concentric or spiral recording tracks in pairs. Storage means for storing data input at a first transfer rate, and second transfer faster than said first transfer rate when the amount of data stored in said storage means reaches a predetermined value. Reading control means for reading out the data stored in the storage means at a speed, and stopping reading of the data stored in the storage means when the amount of data stored in the storage means becomes a predetermined value or less; A recording head for recording the data read from the storage means on the disk by the control means; and a recording head for stopping the reading of the data stored in the storage means. Recording head control means for stopping recording by the head, switching means for switching the recording head from the trace of one of the paired recording tracks to the trace of the other recording track, and stopping the reading of data from the storage means. Control means for controlling the switching means so as to switch the recording head from the trace of one of the paired recording tracks to the trace of the other recording track during the period.

In this disk recording device, when the amount of data stored in the storage means reaches a predetermined value, the data stored in the storage means is read out at a second transfer speed higher than the first transfer speed, When the amount of data stored in the storage unit becomes equal to or less than a predetermined value, the reading of the data stored in the storage unit is stopped, and during the period in which the reading of the stored data is stopped, one of the paired data is stopped. The recording head is switched from the trace of the recording track to the trace of the other recording track.

[0010] Further, a disk reproducing apparatus according to the present invention comprises:
A disk reproducing apparatus for reproducing data from a disk on which recording is performed in a plurality of pairs of concentric or spirally formed recording tracks, wherein reproduced data reproduced from one of the recording tracks on the disk is reproduced. Storage means for storing at a first transfer rate; readout of the reproduction data stored in the storage means at a second transfer rate lower than the first transfer rate; Control means for stopping reproduction from one of the recording tracks on the disk when the value exceeds the value, and reproduction head control for causing the reproduction head to access the other adjacent recording track while reproduction from the disk is stopped. Means.

In this disk reproducing apparatus, when the amount of data stored in the storage means exceeds a predetermined value, reproduction from one of the recording tracks on the disk is stopped, and the reproducing head is stopped during the period when the reproduction is stopped. Is accessed to the other adjacent recording track.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk drive according to an embodiment of the present invention will be described below with reference to the drawings. In describing the optical disk device of this embodiment, an example is shown in which a so-called MD-DATA2 format optical disk is used as a recording medium.

FIG. 1 is a view for explaining the track shape of the optical disk, and FIG. 2 is an enlarged view of a main part A of a recording track of the optical disk. So-called MD-D
The ATA2 format optical disc 1 has a diameter of about 64
mm, a disc-shaped recording medium with a disk thickness of 1.2 mm, on which data is recorded by magneto-optical recording. The optical disc 1 has a track pitch of 0.95.
μm.

On the optical disk 1, spiral lands and grooves are formed on the disk recording surface from the outer peripheral side to the inner peripheral side. In this optical disc 1, the land portion of the formed land and groove becomes a recording track, and data is recorded. In the optical disc 1, the track format is a so-called double spiral format, and two recording tracks (that is, lands) arranged in parallel form a pair on a disc recording surface in a spiral shape. Here, of the pair of recording tracks, the recording track on the inner side is referred to as recording track Tr.
A, and the recording track on the outer peripheral side is a recording track TrB.

A wobbled groove WG provided with wobbles or a non-wobbled groove NWG provided with no wobbles is formed between the recording tracks. Specifically, on the inner peripheral side of the recording track TrA,
The non-wobbled groove NWG is adjacent, and the wobbled groove WG is adjacent to the inner peripheral side of the recording track TrB. That is, a wobbled groove WG is formed between a pair of recording tracks TrA and TrB constituting a spiral, and non-wobbled grooves are formed on both sides of the pair of recording tracks TrA and TrB constituting a spiral. A groove NWG is formed.

A meandering line is formed in the wobbled groove WG in accordance with a signal obtained by modulating the physical address on the optical disk 1 by FM modulation and biphase modulation. for that reason,
A recording / reproducing apparatus for recording / reproducing on / from the optical disc 1 detects a wobble signal which is a signal corresponding to a meandering line formed in the wobbled groove WG, and demodulates the wobble signal, thereby detecting the wobble signal. Physical address information can be extracted. Since the wobbled groove is formed between a pair of recording tracks TrA and TrB forming a spiral, the recording track TrA and the recording track TB are formed.
rB shares one address.

In the optical disc 1, by forming the wobble groove WG in this manner, for example, a wobble signal with reduced crosstalk with a wobble signal given from another wobble groove WG can be detected and recorded. The track pitch of the track can be reduced.

The identification of the recording tracks TrA and TrB to which the same address information is given is performed as follows.

The recording tracks TrA and T
In order to identify rB, for example, as shown in FIG. 3, two side beams for detecting a wobble signal may be used together with a main beam for recording and reproducing recorded data. The beam spots SPs1 and SPs2 of the two side beams are irradiated onto a groove adjacent to the recording track when the beam spot SPm of the main beam is on-track with respect to a predetermined recording track. I have. So, for example,
Main beam spot SPm is recording track T
When rA is in the on-track state, the beam spot SPs1 of the outer side beam is irradiated to the wobbled groove WG, and the beam spot SPs2 of the inner side beam is non-wobbled groove NWG.
Is irradiated. On the other hand, the beam spot S of the main beam
When Pm is in the on-track state on the recording track TrB, the beam spot SPs1 of the outer side beam is irradiated onto the non-wobbled groove NWG, and the beam spot SPs2 of the inner side beam is wobbled groove WG. Is irradiated.

Therefore, in the optical disc 1, depending on whether the beam spot SPm of the main beam is irradiated on the recording track TrA or the recording track TrB,
Beam spots SPs1 and SP of two side beams
The groove irradiated by s2 is wobbled groove W
G and non-wobbled groove NWG are interchanged. Accordingly, in the optical disc 1, the recording track TrA to which the same address information is given is determined by determining which of the side beam spots SPs1 and SPs2 is irradiated on the wobbled groove WG (or the non-wobbled groove NWG). And recording track T
It is identified as rB.

The recording tracks of the optical disk 1 include:
The wavelength λ is 6 through an objective lens having a numerical aperture NA of 0.52.
A 50 nm laser beam is applied. In this recording track, data is recorded at a transfer rate of 589 kB / s, and data is recorded at a constant linear velocity of 2.0 m / s. Then, on this recording track, data is recorded with a bit length of one bit of 0.29 μm.

The recording tracks of the optical disc 1 include:
1-7 RLL (Run Length Limited) modulation method, RS-
Data is recorded in which a PC (Reed-Solomon-product code) error correction method and a block-completed deinterleave method are adopted. As a result, this optical disc 1
The data redundancy is 19.7%, and the storage capacity is about 650 Mbytes as the whole storage capacity.

In the optical disc 1, one address area recorded by the wobbled groove WG constitutes one sector. This one sector is formed about every 6.9 mm along the recording track. And
In the optical disc 1, a unit of one cluster is constituted by recording areas for 16 sectors. In one cluster, data of one error correction (ECC) block unit is recorded. Therefore, in this optical disc 1, the data in the ECC block unit as the data rewriting unit is 1
The physical address is recorded in the cluster, and the data amount to be recorded is consistent. In the optical disc 1,
The data amount of one ECC block is 32768 bytes.

Table 1 below summarizes the specifications of the optical disk 1 described above.

[0025]

[Table 1]

In the optical disc 1 as described above, data can be recorded at a high density. For example, a video signal compressed by MPEG2 can record for about 15 to 17 minutes.

Next, a description will be given of an optical disk apparatus according to an embodiment to which the present invention is applied, which performs recording and reproduction on the optical disk 1.

FIG. 4 is a block diagram showing an optical disk apparatus according to an embodiment to which the present invention is applied.

As shown in FIG. 4, an optical disk device 2 according to the embodiment includes a disk drive device 3 for recording and reproducing data on and from an optical disk 1, and reproduction data supplied from the disk drive device 3 to an external device. An input / output buffer 4 for temporarily storing recording data supplied from an external device to the disk drive device 3; and a control device for controlling the disk drive device 3 and the input / output buffer 4 based on control commands and the like supplied from the external device. 5 is provided.

The disk drive device 3 includes a magnetic head 11 for applying a modulating magnetic field to the optical disk 1 during data recording, an optical head 12 for emitting a laser beam to the optical disk 1 during data recording and reproduction, and an optical disk 1 And a spindle motor 13 for rotationally driving the motor.

The disk drive device 3 includes a data input unit 14, an ID and EDC encoder 1 as a recording system.
5, the ECC decoder 16, the memory 17, and the modulation unit 1
8 and a magnetic field modulation driver 19. The disk drive device 3 includes an RF amplifier 21 as a reproduction system.
, An RF signal demodulation unit 22, an ID decoder 23, a memory 24, an ECC decoder 25, and an EDC decoder 26.
And a data output unit 27. The disk drive device 3 includes a servo controller 28 as a servo system. The disk drive device 3 includes an ADIP decoder 29 that detects a wobble signal recorded in the wobbled groove WG of the optical disk 1 and detects physical address information of the optical disk 1. And
The disk drive device 3 includes a system controller 30 that controls the recording system and the reproduction system, and the servo controller 28 and the like.

The disk drive 3 performs the following processing during a recording operation.

The disk drive 3 is supplied with recording data to be recorded on the optical disk 1 via an input / output buffer 4 from an external device such as a camera, a video tape recorder, or a set-top box for satellite broadcasting. This recording data is supplied to the data input unit 14. The recording data input to the data input unit 14 is
The ID is supplied to the EDC encoder 15. ID, ED
The C encoder 15 adds ID information of the recording data and an error detection code (EDC) for detecting an error of the recording data to the supplied recording data.
The recording data to which ID information and EDC are added is ECC
The data is supplied to the decoder 16. The ECC decoder 16 outputs an error correction code (E) in predetermined error correction block units.
CC) is added to the recording data. The recording data to which the ECC has been added is temporarily stored in the memory 17.

The recording data stored in the memory 17 has a time lag caused by a difference between a transfer rate when data is transferred from the external device to the disk drive 3 and a write rate when writing data to the optical disk 1. After being absorbed by the memory 17, it is supplied to the modulation unit 18. The modulator 18 modulates the supplied recording data by a predetermined modulation method. The modulated recording data is supplied to the magnetic field modulation driver 19. Magnetic field modulation driver 19
Drives the magnetic head 11 in accordance with the supplied recording data, and performs magneto-optical recording of the recording data on a recording track of the optical disc 1.

The disk drive 3 performs the following processing during the reproducing operation.

In the disk drive 3, the data recorded on the recording track of the optical disk 1 is read by the optical head 12 and a reproduction signal is supplied to the RF amplifier 21. The RF amplifier 21 performs processing such as amplification of a reproduction signal read from the optical disc 1 and supplies the reproduced signal to the RF signal demodulation unit 22. The RF signal demodulation unit 22 performs reproduction signal binarization processing, demodulation processing, and the like to generate reproduction data. The generated reproduction data is temporarily stored in the memory 24. The reproduction data generated by the RF signal demodulation unit 22 is also supplied to the ID decoder 23. ID decoder 2
No. 3 detects ID information from the reproduction data. The detected ID information is temporarily stored in the memory 24 together with the reproduction data indicated by the ID information.

The reproduction data stored in the memory 24 has a time lag caused by a difference between a read rate when reading data from the optical disk 1 and a transfer rate of data from the disk drive device 3 to an external device.
4 is supplied to the ECC decoder 25. The ECC decoder 25 performs error correction of the reproduced data based on the ECC added in a predetermined error correction block unit. The error-corrected playback data is EDC
The data is supplied to the decoder 26. The EDC decoder 26 detects an error in the reproduced data based on the EDC added to the reproduced data. The reproduced data for which the error has been detected is supplied to the data output unit 27. The data output unit 27 supplies reproduction data to an external device such as a camera, a video tape recorder, or a satellite broadcast set-top box via the input / output buffer 4.

The disk drive device 3 performs the following servo processing during a recording operation or a reproducing operation.

The RF amplifier 21 focuses on the signal detected by the optical head 12 and indicates whether the laser spot of the laser beam emitted from the optical head 12 is just focused on the recording surface of the optical disc 1. An error signal, a tracking error signal indicating whether or not this laser spot is just a recording track, and the like are generated. The focus error signal, the tracking error signal, and the like are supplied to the servo controller 28. The servo controller 28 controls the optical head 12 based on the focus error signal, the tracking error signal, and the like so that the laser spot of the laser beam emitted from the optical head 12 becomes a just spot or just track.

The servo controller 28 controls the rotation speed of the spindle motor 13 based on, for example, a clock obtained from a wobble signal or the like so that data can be recorded or reproduced at a constant linear velocity. The servo controller 28 switches the power of the laser light emitted from the optical head 12 or controls the power so that recording or reproduction can be performed on the optical disc 1 with a suitable laser power.

In the disk drive 3, at the time of a recording operation or a reproducing operation, a process of detecting address information from the optical disk 1 is performed as follows.

As described above, the wobbled groove WG adjacent to the recording track (land) is formed on the optical disc 1.
Address information. RF amplifier 21
Is, for example, two side spots SPs1 and SPs2
A so-called push-pull signal is generated from the difference between the reflected light amounts. This push-pull signal is output to the ADIP decoder 2
9. The ADIP decoder 29 detects a wobble signal from the push-pull signal. And AD
The IP decoder 29 decodes the wobble signal, detects a physical address on the optical disc 1 which is currently recording or reproducing, and supplies the physical address to the system controller 30. The ADIP decoder 29 determines the polarity or the like of the wobble signal and determines whether the track position of the recording track currently being recorded or reproduced is the inner recording track TrA or the outer recording track TrB. Is detected. The position information of the recording track is supplied to the system controller 30.

The system controller 30 has an ADIP
The address information and the track position information detected by the decoder 29 are supplied. Information such as a reproduction start address and a recording start address is supplied from the control device 5 to the system controller 30. The system controller 30 generates a track jump signal for moving the optical head 12 in the radial direction of the optical disc 1 based on the information, and supplies the generated signal to the servo controller 28. The servo controller 28 moves the optical head 12 in the radial direction of the optical disc 1 based on the track jump signal, and irradiates a recording track at a predetermined address with a laser beam.

As described above, in the disk drive device 3, the recording data supplied from the external device is
In addition, the optical disk 1 can be reproduced, and reproduced data can be supplied to an external device.

Next, the recording track TrA and the recording track T in the optical disk device 2 according to the embodiment of the present invention will be described.
The switching processing operation with rB will be described.

Here, as shown in FIG. 5, recording data continuously supplied to an input / output buffer 4 from an external device such as a camera, a video tape recorder, or a set-top box for satellite broadcasting. The bit rate of the reproduced data continuously supplied from the buffer 4 to the external device is defined as a transfer rate Vb. As shown in FIG. 5, the bit rate of the recording data recorded on the optical disk 1 by the disk drive device 3 and the bit rate of the reproduction data reproduced from the optical disk 1 by the disk drive device 3 are defined as the write rate Vt. . Note that the relationship between the transfer rate Vb and the write rate Vt is as follows: Vt> V
b.

In the optical disk device 2, data is supplied from the external device to the input / output buffer 4 at the transfer rate Vb at the same time as the recording of the disk drive device 3 is started. Therefore, data is stored in the input / output buffer 4 at the speed of Vb. After a lapse of a predetermined time Tj from the start of data accumulation in the input / output buffer 4, the supply of data from the input / output buffer 4 to the disk drive device 3 is started, and data is written to the optical disk 1 at the write rate Vt.

At this time, the data amount of the data stored in the input / output buffer 4 decreases at the speed of Vt-Vb, and becomes zero after a lapse of a certain time Tx. This relationship is represented by the following equation (1).

Tj × Vb = Tx × (Vt−Vb) (1)

This equation (1) indicates that if data is continuously recorded on one recording track during the time Tx, continuous recording at the write rate Vt is guaranteed even if recording for the time Tj is stopped. Means.

The writing rate V to the optical disc 1
Since t is constant, there is a certain proportional relationship between the elapsed time Tx and the number B of clusters to be written during that time, as shown in the following equation (2). Note that C is the number of bits included in one cluster.

B = (Tx × Vt) / C (2)

Therefore, based on the above equations (1) and (2), the relationship shown in the following equation (3) is obtained.

B = (Tj × Vb × Vt) / {C × (Vt−Vb)} (3) If the cluster is not considered, the data amount X to be continuously recorded is calculated by the following equation (4) ) Are satisfied.

X = (Tj × Vb × Vt) / (Vt−Vb) (4)

That is, if continuous recording of at least B clusters or data of X bits or more is performed on one recording track, continuous recording at the transfer rate Vb is guaranteed even if recording is stopped for the time Tj. You.

Here, in the optical disk device 2, since the recording tracks of the optical disk 1 are of a double spiral format, the recording tracks for writing data are divided into the recording track TrA which is the inner recording track and the recording track TrA which is the outer recording track. The recording track TrB is alternately and appropriately recorded. At this time, in the optical disc device 2, after recording on one recording track (either the recording track TrA or the recording track TrB) by the number of clusters represented by the above equation (3), switching to the other recording track is performed. Is going.

In the optical disk device 2, by switching the recording tracks as appropriate and recording data, the data can be recorded on one of the recording tracks without bias, and the innermost side (or the outermost side) of the optical disk 1 can be recorded. ), Data can be sequentially recorded on two recording tracks on average. Therefore, when a predetermined amount of data is recorded on the optical disc 1, the entire outer peripheral side (or inner peripheral side) from a certain address can be set as an unrecorded area where no data is recorded. Therefore, when additional data is recorded on the optical disk 1, data is recorded in this unrecorded area. Therefore, in the optical disk device 2, when recording the additional data, even if the writing position is shifted due to disturbance or the like, there is no possibility that the data already recorded on the optical disk 1 is overwritten and erroneously erased.

Further, in the optical disk device 2, after continuously recording the number of clusters satisfying the relationship shown in the above equation (3) for one recording track, switching between the recording track TrA and the recording track TrB is performed. By doing so, continuity of data supplied from the external device to the input / output buffer 4 can be ensured. That is, in the optical disk device 2, after recording on one recording track equal to or more than the number of clusters derived by the above equation (3), the time required for movement between recording tracks is Tj,
And switching between the recording track TrB,
The transfer rate Vb can be satisfied. Therefore, in the optical disk device 2, the data rate of data supplied from the external device to the disk drive device 3 can be increased, and an application requiring a high data rate, such as moving image data, can be recorded in real time. Can be. Note that the stability of the entire system can be increased by providing a margin for a predetermined time in the time Tj required for the movement between the recording tracks.

As described above, the optical disk apparatus 2 stores the data transferred at the first transfer rate, and stores the stored data on the optical disk in which a plurality of recording tracks arranged in parallel are formed in a spiral shape. At a second transfer rate higher than the first transfer rate,
Based on the switching time that occurs when the recording tracks are switched, the first transfer rate, and the second transfer rate, the amount of data for which continuous data transfer at the first transfer rate is ensured is recorded in one recording track. After recording, a process of switching a recording track for recording data is performed. Therefore, in the optical disk device 2, a plurality of recording tracks arranged in parallel are switched according to the relationship between the switching time, the first transfer rate, and the second transfer rate, and the first track is switched. Continuous data transfer at the transfer rate is ensured, and data is recorded on all recording tracks.

In the optical disk device 2, when data to be recorded on the optical disk 1 has a certain logical structure, switching between recording tracks may be performed using the logical structure unit as one delimiter. good. This logical structure is, for example, a field or a frame if the data to be recorded is image data, a GOP if the image data is compressed by the MPEG system, and a so-called AOP.
Sound data compressed by the TRAC method is a sound unit. As described above, by using the logical structure of the data to be recorded as a switching unit, the optical disc 1
Access performance can be improved.

Next, the switching processing operation between the recording track TrA and the recording track TrB by the optical disk device 2 will be specifically described with reference to the flowcharts shown in FIGS. Note that the flowchart shown in FIG. 7 shows the subroutine processing of step S2 and step S4 shown in FIG.

When the supply of data from the external device to the input / output buffer 4 is started, the control device 5 of the optical disk device 2 performs the following steps S1 to S5.

First, in step S1, the control device 5
Gives a control command to the disk drive device 3 to set a predetermined address (a ₁ ) of the recording track TrA at
The track jump of the magnetic head 11 and the optical head 12 is performed.

Subsequently, in step S2, the disk drive device 3 to which the control command is given records a predetermined number of clusters (n ₁ ) from the address (a ₁ ) of the recording track TrA.

At this time, the control device 5 performs the following steps S11 to S16. First, the control device 5 gives a data recording start command to the disk drive device 3 in step S11 shown in FIG. Subsequently, in step S12, it is determined whether or not the disk drive device 3 has finished recording the predetermined logical structure unit. If it is determined that the recording of the predetermined logical structure unit has been completed, in step S13, the write rate Vt of the data written on the recording track TrA is obtained. Subsequently, in step S14, based on the write rate Vt, a continuous recording length of data to be recorded on one recording track required to secure the write rate Vt is obtained. That is, the above equation (3)
Find the number of clusters indicated by Subsequently, step S1
At 5, it is determined whether or not the data amount recorded on the recording track TrA has reached the continuous recording length. That is, it is determined whether or not the number of clusters equal to or greater than the number of clusters obtained in step S14 has been recorded. If it is determined that the amount of data recorded on the recording track TrA has reached the continuous recording length, an instruction to end recording data on the recording track TrA is given in step S16. At this time, the recording track Tr
The number of clusters recorded in A becomes n ₁ .

Subsequently, in step S3, the control device 5 gives a control command to the disk drive device 3 to store the control command at a predetermined address (a ₂ ) of the recording track TrB.
The track jump of the magnetic head 11 and the optical head 12 is performed. Here, the address (a ₂ ) is, for example, an address near the address (a ₁ ).

Subsequently, in step S4, the disk drive device 3 to which the control command is given records a predetermined number of clusters (n ₂ ) from the address (a ₂ ) of the recording track TrB.

At this time, the control device 5 performs the following steps S11 to S16. First, the control device 5 gives a data recording start command to the disk drive device 3 in step S11 shown in FIG. Subsequently, in step S12, it is determined whether or not the disk drive device 3 has finished recording the predetermined logical structure unit. When it is determined that the recording of the predetermined logical structure unit has been completed, in step S13, the write rate Vt of the data written on the recording track TrB is obtained. Subsequently, in step S14, based on the write rate Vt, a continuous recording length of data to be recorded on one recording track required to secure the write rate Vt is obtained. That is, the above equation (3)
Find the number of clusters indicated by Subsequently, step S1
At 5, it is determined whether or not the data amount recorded on the recording track TrA has reached the continuous recording length. That is, it is determined whether or not the number of clusters equal to or greater than the number of clusters obtained in step S14 has been recorded. If it is determined that the amount of data recorded on the recording track TrB has reached the continuous recording length, an instruction to end recording data on the recording track TrB is given in step S16. At this time, the recording track Tr
The number of clusters recorded in B is n ₂ .

Subsequently, in step S5, the control device 5 adds the address of the number of clusters (n ₁ ) recorded in step S2 to the address (a ₁ ) of the recording track TrA, and adds the address of the recording track TrB. Address (a
₂₎ the number of clusters recorded in step S4 ₍₂ pieces n)
The process from step S1 is repeated by adding the address of the minute.

As described above, in the optical disk device 2, for the optical disk 1 having the double spiral format, the continuous recording length to be recorded on one recording track is obtained from the write rate Vt of the data written on the recording track. The amount of data that ensures continuous data transfer at the write rate Vt is determined. Then, in the optical disc device 2, after recording data longer than the continuous recording length on one recording track, the recording track on which the data is recorded is switched to another recording track.

As a result, in the optical disk device 2, data can be efficiently recorded on the optical disk 1, and the transfer rate of data from the external device to the input / output buffer 4 can be increased.

In the optical disk device 2, information on the switching point between the recording track TrA and the recording track TrB, that is, link information between the recording track TrA and the recording track TrB is stored in, for example, a so-called TOC (table of contents) or the like. Record in the disk management area. As a result, at the time of reproduction, this switching point can be easily determined, and continuous data can be reproduced. Also,
The optical disk device 2 reads data from the optical disk 1 at a speed equal to or higher than the write rate Vt based on the switching point information between the recording track TrA and the recording track TrB at the time of reproduction, so that an external device can be read. Data can be sent out while securing the transfer rate Vb.

Next, the recording track TrA and the recording track T in the optical disk device 2 according to the embodiment of the present invention will be described.
Another switching processing operation with rB will be described.

First, the processing at the time of recording will be described.

In the optical disk device 2, data is supplied from the external device to the input / output buffer 4 at the transfer rate Vb at the same time as the recording of the disk drive device 3 is started. Therefore, data is stored in the input / output buffer 4 at the speed of Vb. When data equal to or more than a predetermined threshold value (first threshold value) is accumulated in the input / output buffer 4, the supply of data from the input / output buffer 4 to the disk drive device 3 is started, and the data is written to the optical disk 1 at the write rate Vt. It is written.

At this time, the data amount of the data stored in the input / output buffer 4 decreases at the speed of Vt-Vb, and becomes zero after a certain time has elapsed.

Therefore, in the optical disk device 2, the amount of data stored in the input / output buffer 4 is managed by the control device 5. The control device 5 includes an input / output buffer 4
Is smaller than a predetermined threshold value (second
When the value becomes equal to or less than the threshold value, the supply of data from the input / output buffer 4 to the disk drive device 3 is stopped.

In the optical disk device 2, the input / output buffer 4
Since the supply of data from the external device to the input / output buffer 4 is continued even while the supply of data from the external device to the disk drive device 3 is stopped, the amount of data stored in the input / output buffer 4 Increases at the speed of Vb. When data equal to or greater than a predetermined threshold (first threshold) is accumulated in the output buffer 4, the supply of data from the input / output buffer 4 to the disk drive device 3 is started again, and the data is written to the optical disk 1 at the write rate Vt. Data is being written.

In the optical disk device 2, by repeating the above processing, the failure of the input / output buffer 4 is avoided while ensuring the transfer of data from the external device to the input / output buffer 4.

Here, in the optical disk device 2, switching between the recording track TrA and the recording track TrB is performed during a period in which the supply of data from the input / output buffer 4 to the disk drive device 3 is stopped. Therefore, in the optical disk device 2, the data recording operation on the optical disk 1 is not hindered by the switching operation that occurs when the recording track TrA and the recording track TrB are switched, and the recording track can be switched efficiently.

Next, the processing at the time of reproduction will be described.

In the optical disk device 2, the disk drive device 3 rotates the optical disk 1 at a predetermined linear velocity, reproduces the data for a predetermined time, accumulates the reproduced data in the input / output buffer 4 at the write rate Vt.
To send data to an external device at a transfer rate Vb lower than the write rate Vt. It goes without saying that the transfer speed of data supplied from the disk drive device 3 to the input / output buffer 4 depends on the rotation speed (linear speed) of the optical disk 1.

The writing to the input / output buffer 4 is performed by so-called intermittent reproduction in which reproduction from the optical disk 1 is stopped when the amount of accumulated data becomes equal to or more than a predetermined threshold value (a state close to being full).

Here, in the optical disk apparatus 2, when the amount of data stored in the input / output buffer 4 during the intermittent reproduction becomes equal to or more than a predetermined value, control is performed so that one recording track for reproduction accesses the other recording track. To do.

Hereinafter, specific reproduction control will be described with reference to the flowchart shown in FIG.

First, in step S21, when a reproduction instruction is issued, data reproduction is started from one recording track (for example, recording track TrA) of the double spiral on the disk.

Subsequently, in step S22, the reproduction data reproduced from the optical disk 1 is stored in the input / output buffer 4.

Subsequently, in step S23, the reproduction data stored in the input / output buffer 4 is written at the write rate V
Transmission is started at a transfer rate Vb slower than t.

In step S24, it is determined whether or not the amount of data stored in the input / output buffer 4 has reached or exceeded the first threshold value. If it is determined in step S24 that the amount of data stored in the input / output buffer 4 is smaller than the first threshold value, the process returns to step S22 to continue writing the reproduction data to the input / output buffer 4.

If the amount of data stored in the input / output buffer 4 is equal to or larger than the first threshold value in the determination in step S24, the reading of the reproduced data from the optical disk 1 is stopped in step S25.

Subsequently, in step S26, a track jump is performed from one recording track (for example, recording track TrA) that was performing reproduction to the other recording track TrB.

Subsequently, in step S27, the reproduction standby state (that is, one track jump is repeated) is controlled, and in step S28, the second data storage amount of the input / output buffer 4 is sufficiently smaller than the first threshold value. Is determined to be less than or equal to the threshold value. If the amount of data stored in the input / output buffer 4 is equal to or less than the second threshold, the above-described step S21
And the process is repeated. If the data storage amount of the input / output buffer 4 is larger than the second predetermined value, the process returns to step S27 to repeat the reproduction standby state.

As described above, in the optical disk device 2, the operation of reproducing data from the optical disk 1 is performed by the recording track T.
The recording track can be switched efficiently without being hindered by the switching operation that occurs when switching between rA and the recording track TrB.

In describing an embodiment of the present invention, a double spiral track type optical disk 1 is described.
Although the disk drive device 3 for recording data on the optical disk has been described, the present invention is not limited to recording data on an optical disk having a double spiral track format.
The number of recording tracks is not limited as long as the recording tracks are formed spirally or concentrically. Further, the present invention is not limited to an optical disk, but is also applicable to a disk-shaped recording medium such as a magnetic disk.

[0096]

According to the optical disk recording apparatus of the present invention,
When the amount of data stored in the storage unit reaches a predetermined value, the data stored in the storage unit is read at a second transfer speed higher than the first transfer speed, and the data stored in the storage unit is read out. When the amount becomes equal to or less than the predetermined value, the reading of the data stored in the storage means is stopped, and during the period in which the reading of the stored data is stopped, the trace of one of the paired recording tracks is changed to the other recording track. Switch recording head to trace to. Further, in the disc reproducing apparatus according to the present invention, when the amount of data stored in the storage means becomes equal to or more than a predetermined value, the reproduction from one of the recording tracks on the disc is stopped, and during the period when the reproduction is stopped. The reproducing head accesses the other adjacent recording track.

As a result, in the present invention, data can be recorded on an optical disk in which a plurality of recording tracks arranged in parallel are formed in a spiral shape by switching each recording track efficiently. Therefore, according to the present invention, recording or reproduction on the optical disk can be performed at high speed, and for example, the influence of a decrease in the data transfer rate due to movement between recording tracks such as a recording head can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a track shape of an optical disk used in an optical disk device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the optical disc.

FIG. 3 is a diagram for explaining a beam spot irradiated on a recording track to detect a physical address of the optical disc.

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

FIG. 5 is a diagram for explaining a transfer rate of data supplied to the optical disk device and a transfer rate at which the optical disk device writes data on an optical disk.

FIG. 6 is a flowchart illustrating a data recording process of the optical disc device.

FIG. 7 is a flowchart illustrating a data recording process of the optical disc device.

FIG. 8 is a flowchart illustrating a data reproduction process of the optical disc device.

[Explanation of symbols]

1 optical disk, 2 optical disk device, 3 disk drive device, 4 input / output buffer, 5 control device

Claims (2)

[Claims] 1. A disk recording apparatus for recording a plurality of concentrically or spirally formed recording tracks in pairs, a storage means for storing data input at a first transfer speed, and said storage means When the amount of data stored in the storage unit reaches a predetermined value, the data stored in the storage unit is read at a second transfer speed higher than the first transfer speed, and the amount of data stored in the storage unit is reduced. Read control means for stopping reading of data stored in the storage means when the value becomes equal to or less than a predetermined value; recording head for recording data read from the storage means by the read control means on the disk; and storage means Print head control means for stopping printing by the print head during a period in which reading of data stored in the print head is stopped; and one of the paired prints Switching means for switching the recording head from a trace on the rack to a trace on the other recording track; and a means for switching the recording head from the trace on one of the paired recording tracks to the other while the data reading from the storage means is suspended. And a control means for controlling the switching means so as to switch to the trace to the recording track. 2. A disk reproducing apparatus for reproducing data from a disk on which recording is performed in pairs of a plurality of recording tracks formed in a concentric or spiral shape, wherein the data is reproduced from one of the recording tracks on the disk. Storage means for storing the reproduction data at a first transfer rate; reading the reproduction data stored in the storage means at a second transfer rate lower than the first transfer rate; Control means for stopping reproduction from one of the recording tracks on the disk when the amount becomes equal to or more than a predetermined value; and causing the reproduction head to access the other adjacent recording track while reproduction from the disk is stopped. A disk reproducing device comprising a reproducing head control means.