JP2000123493A - Optical disk and recording/reproducing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a seeking time and an interfacing time by composing a sector of a header zone and a recording zone having an address, composing a track of plural sectors and composing plural ECC blocks to form a unit of recording/reproducing. SOLUTION: In an address signal generating circuit 12, timing signals consisting of FG signals or the like which synchronize with a rotation of a disk master board 16 are received from a spindle motor 17 or the like, address data ID which shows a laser beam irradiating position by counting the timing signals with a prescribed counter are generated. A sector mark SM, synchronizing timing data VFO, a header mark AM and a post amble PA are added to the address data ID, and a group header and a land header which are allotted to the forward half part and the backward half part of an address area are generated. A driving circuit 14 is formed by meandering a group in an user area according to control by a system control circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk and a method for recording / reproducing the same.

[0002]

2. Description of the Related Art Conventionally, optical recording media such as disk-shaped optical recording media and card-shaped optical recording media utilizing an optical or magneto-optical signal recording / reproducing method have been developed and are being supplied to the market. These optical recording media can be read-only memory (ROM), such as a so-called compact disc (CD), or the user can write data once. Known are write-once-type (write-once type) and data-rewritable (so-called overwrite) such as a magneto-optical (MO) disk.

An optical disk apparatus for writing / reading data to / from a disk-shaped optical recording medium includes a laser diode for emitting a light beam for recording / reproducing information and a photodetector for detecting reflected light of a light beam applied to an optical disk. Built-in, etc., using an optical head to which focus servo and tracking servo are applied based on the detection output by the photodetector, while rotating the optical disk at a constant angular velocity or a constant linear velocity by applying speed servo to the spindle motor, The recording / reproducing of data is performed by scanning the recording track of the optical disk with a light beam.

Here, for example, the International Organization for Standardization (ISO: Inter)
In the magneto-optical disk system defined by the National Organization for Standardization), a block code is adopted.

[0005] In the format of the magneto-optical disk specified by the ISO, the direction of user data is the direction of data on the disk. Also, in the ECC block using the block code, the direction of the correction code is interleaved with respect to the data direction on the disk in order to enhance the correction capability for a burst error.

In the conventional optical disk device, 1E
Data recording / reproduction has been performed in units of CC blocks.

[0007]

By the way, in a conventional optical disk apparatus which records / reproduces data in units of one ECC block, when recording / reproducing audio information or visual information, when accessing in units of ECC blocks, A problem that seek time is increased or a command for interfacing the drive and the AV system is required each time, and the time becomes redundant, so that the transfer rate of the AV data is reduced and, for example, the image quality is reduced. There was a point.

In view of the above-mentioned conventional problems, an object of the present invention is to provide an optical disc capable of recording / reproducing high-quality data by securing a transfer rate and recording / reproducing the data. It is to provide a reproduction method.

[0009]

In the optical disk according to the present invention, a sector is constituted by a header area having an address and a recording area, and a track is constituted by a plurality of sectors.
An ECC block is constituted by a plurality of sectors, and has a disk format in which the plurality of ECC blocks are a unit of recording / reproduction.

An optical disk according to the present invention is, for example,
The data recording surface has a sector structure in which a plurality of zone structures are formed by concentrically dividing the data recording surface, and the data recording surface is divided into radial regions for each zone. The unit is an integral multiple of the number of sectors per ECC block.

Further, in the recording / reproducing method for an optical disk according to the present invention, a sector is constituted by a header area having an address and a recording area, a track is constituted by a plurality of sectors, and an ECC block is constituted by a plurality of sectors. Data is recorded / reproduced on / from an optical disk in a disk format in which a plurality of ECC blocks are used as a unit.

In the recording / reproducing method for an optical disk according to the present invention, for example, a sector in which a data recording surface is divided concentrically to form a plurality of zone structures and the data recording surface is divided into radial areas for each zone. Data is recorded / reproduced on / from an optical disk having a structure in a disk format in which the number of tracks per zone is an integral multiple of the number of sectors per a plurality of ECC blocks which is the unit of recording / reproduction.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

The optical disk according to the present invention is applied to, for example, an optical disk 1 having a configuration as shown in FIG.

The optical disc 1 has a sector structure formed by dividing a data recording surface into radial areas, and a plurality of zones Z by dividing a data recording surface concentrically.
It has a zone structure in which 0 to Zn are formed. One track of the optical disc 1 is composed of a plurality of sectors.

Each sector is assigned to an address area AR1 where an address is written, and the remaining area is assigned to a user area AR2 where data is written. In the user area AR2, the groove GR is formed in a meandering state. Further, in the track in the innermost zone Z0, the groove GR is formed so as to meander over a predetermined cycle, and the number of meanders of the groove GR is sequentially increased as moving to the outer zone. The address area AR1 is discretely arranged on the optical disc, and records address information in sector units.
In the address area AR1, a length corresponding to a certain period of the groove GR is assigned.

Here, in the first half of the address area AR1, an address pit row formed by embossing the groove header GRH is formed on the track center formed by the groove GR. In the latter half of the address area AR1, an address pit row formed by embossing the land header LH is formed on a track center formed by lands.

Here, in the zone Z1 adjacent to the outer peripheral side with respect to the zone Z0, the innermost linear density of the zone Z0 is the same as the innermost linear density of the zone Z1, and is increased by one sector per track. So as to form a zone. Similarly, in zone Z2, which is adjacent to zone Z1 on the outer peripheral side,
Zones are formed such that the innermost linear density of the zone Z1 is the same as the innermost linear density of the zone Z2, and one sector is increased per track. Similarly, zoning with the highest capacity efficiency can be performed by forming the zones Z0 to Zn.

For example, when simultaneous recording / reproduction is performed in units of 4 Mbytes, as shown in FIG. 2, 4 Mbytes of data are recorded (W) and 4 Mbytes of data are reproduced (R).
I do. Seek (se) between recording (W) and playback (R)
ek). For both recording / reproduction (W / R), if the recording / reproduction channel rate of the drive is 35 Mbps and the full seek time from the inner circumference to the outer circumference or from the outer circumference to the inner circumference is 0.5 seconds, the AV information is 11.4 Mbps data. Rate can be. This rate is MPEG
When the AV information is compressed in step 2, sufficient image quality can be obtained.

FIG. 3 shows an example of the zoning table.

In the zoning table shown in FIG. 3, zone indicates a zone number, and r indicates a disk radial position. “tracks” indicates the number of tracks per zone, and “start track” indicates the total number of tracks. “sect / track” indicates the number of sectors per track, and “sect / zone” indicates the number of sectors per zone. user's track
Indicates the number of user tracks per zone, and u sec
t / zone indicates the number of user sectors per zone. min. Density is the linear density (μm / bi
t), and cap indicates the capacity (M bytes).
The data area has a radius of 24 mm to 58 mm, and the track pitch is 0.45 μm.

In the optical disc 1 employing this zoning table, for example, a sector has a data capacity of 8 kbytes, and an ECC block has 64 kbytes, that is, 8 sectors. Using 4 Mbytes, that is, 512 sectors (64 ECC blocks) as a unit of recording / reproduction, the number of tracks per zone of zones Z0 to Z11 is 12 of 4 Mbyte sectors 512 as recording / reproduction units.
It is set to 6144 times.

Next, FIG. 4 shows a sector configuration of the optical disk 1. As shown in FIG.

In the sector configuration shown in FIG. 4, the header (Header) includes a sector mark (SM), timing data VFO1, VFO2 for synchronization, header marks (AM1, AM2), ID1, ID2, and postamble (PA1, PA2). ). A header 1 is formed in the groove, and a header 2 is formed in the land. The gaps (Gap1, Gap2, Gap3) are used for switching time of a timing signal and the like. Guard
1, Guard2) is a guard area for recording start and recording end. The guard area has a fixed length and moves the position of the recording data by jch every time recording is performed. As a result, the data at the recording start and recording end positions is not used, and the deterioration of the specific recording at the recording start and end positions due to overwriting is not affected by the data. Further, the number of overwrites is improved by moving the recording data position every time recording is performed. Also,
Automatic power control (APC) for recording in Guard1
Is performed. Guard1 has a length sufficient to set the recording power. VFO is the PL of the recording data.
This is the L pull-in area. SYNC indicates the start position of data. DATA is 8 kbytes. Buffer is
This area absorbs the influence of jitter such as eccentricity. In addition,
In one sector, the groove is formed so as to meander for 408 periods.

The optical disc 1 is manufactured by exposing the master disc to light, for example, by a mastering device 10 having the configuration shown in FIG.

The mastering device 10 includes a synthesizing circuit 13 for synthesizing signals from the wobble signal generating circuit 11 and the address signal generating circuit 12 and outputting a driving signal SD;
A drive circuit 14 for driving the optical head 15 based on the drive signal SD, a spindle motor 17 for driving the master disk 16 to rotate, and a system control circuit (not shown) are provided.

The wobble signal generation circuit 11 outputs a sine wave signal of a predetermined frequency synchronized with the rotation of the disk master 16 as a wobble signal WB. Further, the wobble signal generation circuit 11 responds to the zoning by
The frequency of B is increased stepwise and output. Thereby, the wobble signal generation circuit 11 displaces the laser beam irradiation position by the wobble signal WB, and makes the groove GR meander over a predetermined period per sector.

The address signal generation circuit 12 generates an address signal SA whose value sequentially changes according to the displacement of the optical head 15 under the control of a system control circuit (not shown).

More specifically, the address signal generation circuit 12
Receives a timing signal such as an FG signal synchronized with the rotation of the disk master 16 from the spindle motor 17 or the like, counts the timing signal by a predetermined counter, and outputs address data I indicating the laser beam irradiation position.
Generate D. At this time, the address signal generation circuit 12
Adds a sector mark SM, a synchronization timing data VFO, a header mark AM, and a postamble PA to an address data ID to generate a groove header and a land header to be assigned to the first half and the second half of the address area AR1, respectively. I do. The synchronization timing data VFO is recorded / synchronized as the synchronization timing data VFO at the beginning of the user area AR2.
The same clock pattern as the reproduced clock pattern is generated. The address signal generation circuit 12 converts the sector header thus generated into a serial data string, and modulates the serial data string in a predetermined format.

Then, the address signal generation circuit 12 supplies the modulated output to the synthesis circuit 13 as an address signal SA. The address signal generation circuit 12 outputs the address signal SA at a timing corresponding to the scanning of the laser beam L from the optical head 15.

The drive circuit 14 zones the disk master 16 by switching the driving conditions of the optical head 15 in accordance with the laser beam irradiation position at a timing synchronized with the rotation of the disk master 16. Specifically, the drive circuit 14 switches the drive conditions of the optical head 15 so that the data recording surface of the master disk 16 is divided into radial areas to form a sector structure. Further, by changing the switching timing stepwise from the inner circumference to the outer circumference, the data recording surface is divided concentrically to form a plurality of zones Z0 to Zn.

In accordance with the control of the system control circuit, the drive circuit 14 displaces the irradiation position of the laser beam by the drive signal SD in the user area AR2, whereby the groove GR is moved to the user area AR2.
Are formed to meander.

In the address area AR1, in the first half of the address area AR1, the displacement of the irradiation position of the laser beam is stopped, and the light amount of the laser beam is intermittently started by the drive signal SD, thereby the track center by the groove GR. A pit row is formed on the top. In the latter half of the address area AR1, the laser beam irradiation position is displaced to the track center by the inner land, and the light amount of the laser beam is intermittently raised by the drive signal SD, whereby the pit row is formed on the track center by the land. To form

At this time, the driving circuit 14 records the address data of the sector by the following groove GR on the track center in the first half of the address area AR1 in a pit row, and the second half of the address area AR1. The address data of the sector by the land on the inner peripheral side is recorded on the track center by a pit row.

The optical head 15 is configured such that the optical system is movable in the radial direction of the master disk 16. Further, when an optical disk is prepared from the disk master 16, the optical head 15 controls the laser beam L so that the groove GR formed by exposure with the laser beam L and the width of the land between the adjacent grooves GR are substantially equal. Is set. Here, the spot shape and the light amount of the laser beam L are set such that the effective exposure range by the laser beam L is expanded with respect to the width of the groove GR as the final target. Therefore, the optical head 15
Exposes the disk master 16 so that the optical disk created by the disk master 16 can be recorded between the land / groove GR.

The master disk 16 is formed, for example, by applying a resist to the surface of a glass substrate. Master disc 16
Is driven to rotate at a constant angular velocity by a spindle motor 17. Then, the optical head 15 irradiates the laser beam L onto the disk master 16 while being sequentially displaced from the inner circumference side to the outer circumference side of the disk master 16 by a predetermined thread mechanism in synchronization with the rotation of the disk master 16. . Thus, the optical head 15 forms a spiral track from the inner circumference to the outer circumference of the master disc 16.

After the above-described processing, the mastering device 10 irradiates the disk base 16 with the laser beam L, thereby converting the above-described optical disk 1 to, for example, NA0.
At 85, a high numerical aperture optical disk having a substrate thickness of 0.1 mm is manufactured.

Next, a recording / reproducing apparatus 20 for recording data on the optical disk 1 or reproducing data from the optical disk 1 will be described with reference to FIG.

The recording / reproducing apparatus 20 includes an optical head 21 for recording / reproducing data via a laser beam,
A recording / reproducing circuit 22 for converting data into a predetermined format, a thread motor 23 for moving the optical head 21 in the radial direction of the optical disk 1, a servo circuit 24 for controlling tracking / focusing, and reading from the optical disk An address detection circuit 25 for detecting the address of the data being read and a spindle motor 26 for rotating the optical disk are provided.

The optical head 21 records data supplied via a system control circuit 32 and a recording / reproducing circuit 22, which will be described later, on the optical disk 1 via a laser beam. Here, the recording / reproducing circuit 22 converts the data supplied from the system control circuit 32 into a predetermined format and supplies the data to the optical head 21.

The recording / reproducing circuit 22 converts the data into sector units having the configuration shown in FIG. 4 and records the data on the optical disk 1 via the optical head 21. The sector is
It consists of a header area formed from embossed pits and an 8 kbyte recording / reproducing area.

FIG. 7 shows an ECC block cluster.

In the ECC block cluster shown in FIG. 7, Sync is a synchronization signal, and BIS is burst.
indicator subcode, Sync
And BIS are data symbols.

The recording / reproducing circuit 22 performs recording / reproduction in the horizontal direction of the ECC block cluster shown in FIG.
When consecutive symbols along with Sync are in error, S
A data symbol sandwiched between SYNC and BIS is regarded as an error, and a pointer is attached. Then, the main correction code LDC shown in FIG.
At (248, 216, 33), pointer erasure correction is performed.

In the recording / reproducing circuit 22, as shown in FIG. 8, an error correction block is composed of 64 Kbytes of data. It can also be handled as a 2 kbyte data sector. At this time, recording / reproducing is performed in error correction blocks in units of 64 kbytes.
A data sector of k bytes is recorded / reproduced. The error correction code LDC (248, 216, 33) is composed of 216 symbols of data and 32 symbols of parity.

The above-mentioned optical head 21 is opposed to a high numerical aperture optical disk having a NA of 0.85 and a substrate thickness of 0.1 mm, and has a wavelength of 635 nm or 515 nm.
nm laser. This optical head 21
A detection output of the reflected light of the laser beam from the optical disk 1 is supplied to a recording / reproducing circuit 22, a servo circuit 24, an address detection circuit 25, and a wobbling signal generation circuit 27.

The servo circuit 24 generates a focus error signal from the detection output of the optical head 21, and performs focusing control of the optical head 21 based on the focus error signal. Further, the servo circuit 24 includes the optical head 2
A push-pull signal is generated from the detection output of No. 1 and tracking control of the optical head 21 is performed based on the push-pull signal.

The address detection circuit 25 decodes the address data from the detection output of the optical head 21 and detects an error, and then supplies the decoded address to the system control circuit 32.

The recording / reproducing apparatus 20 includes a wobbling signal generating circuit 27 for generating a wobbling signal.
A wobbling cycle detection circuit 28 for detecting the cycle of the wobbling signal, a PLL circuit 29, a cluster counter 30 for counting the address position, a ROM 31 for storing a predetermined control program, and a system control for controlling each circuit. And a circuit 32.

The wobbling signal detection circuit 27 includes a band pass filter (BPF) 27a for removing noise components from the wobbling signal, and a comparator 27b for performing a binarization process. The BPF 27a outputs, via the optical head 21, a detection output (wobbling signal) of the wobbling of the groove recorded on the optical disc 1.
Is supplied. The BPF 27a removes the noise of the wobbling signal and supplies it to the comparator 27b. The comparator 27b performs a binarization process on the wobbling signal from the BPF 27a to obtain a wobbling detection pulse, and supplies the wobbling detection pulse to the wobbling cycle detection circuit.

The wobbling cycle detection circuit 28 determines the periodicity of the wobbling detection pulse, and supplies the same to the PLL circuit 29 if the wobbling detection pulse has a certain periodicity.

The PLL circuit 29 includes a phase comparator 29a,
A low-pass filter (LPF) 29b for removing high-frequency noise components, and a voltage-controlled oscillator (VCO) 29c
And a frequency divider 29d.

The phase comparator 29a receives the wobbling detection pulse from the wobbling cycle detection circuit 28 and the frequency divider 29.
d, and compares a phase with a pulse from the VCO via the LPF 29b.
29c. The VCO 29c transmits a channel clock (hereinafter referred to as “R / W”) based on the phase comparison error signal.
Clock ". ) Is supplied to the frequency divider 29d and the cluster counter 30. The divider 29d is
The frequency division ratio is controlled by the system control circuit 32, and VC
The R / W clock from O29c is frequency-divided, a pulse having the same frequency as the frequency of the wobbling signal is generated, and supplied to the phase comparator 29a. With this processing, an R / W clock is generated based on the wobbling signal.

The cluster counter 30 performs synchronous signal processing in synchronization with the address cycle based on the address from the address detection circuit 25 and the R / W clock from the VCO 29c, and counts the position of the next address. Also,
When the position of the next address cannot be detected, the cluster counter 30 determines the position of the next address from this counter and counts up the address.

The system control circuit 32 controls the rotation of the thread motor 23 based on the address detected by the cluster counter 30 to access the optical head 21 to a predetermined position on the optical disk, and perform cluster recording / reproduction. Data is recorded and / or reproduced according to the timing. Further, the ROM 31 stores data of the frequency division ratio of the frequency divider 29 d corresponding to the address, and the system control circuit 32 determines the frequency divider 29 based on the data of the ROM 31.
The frequency division ratio of d is controlled. Then, the system control circuit 32 controls the recording / reproducing circuit 22 so that the optical head 2
The data read from 1 is subjected to predetermined signal processing and output to the outside, and the data input from the outside is converted into a predetermined format and recorded on the optical disk 1 via the optical head 21.

[0056]

As described above in detail, in the optical disc according to the present invention, a sector is constituted by a header area having an address and a recording area, a track is constituted by a plurality of sectors, and an ECC block is constituted by a plurality of sectors. It is configured and has a disk format in which a plurality of ECC blocks are used as a unit of recording / reproduction, so that it is accessed in units of a plurality of ECC blocks at the time of recording / reproduction.

When recording / reproducing AV information, a plurality of ECs
By accessing the C block as a unit, it is possible to reduce the seek time and the time for interfacing the drive and the AV system generated for each access.

Further, the zoned optical disc is recorded / recorded.
In the case of reproduction, the number of tracks per zone is set to an integral multiple of the number of sectors per a plurality of ECC blocks as the recording / reproduction unit, so that a plurality of ECs per zone are obtained.
It will be completed in C block. Accordingly, since the plurality of ECC blocks are not included in the access to the ECC block, a seek caused by the zone change point does not occur, and the transfer rate can be increased. Image quality can be improved.

Therefore, according to the present invention, it is possible to provide an optical disk and a recording / reproducing method capable of recording / reproducing high-quality data while securing a transfer rate.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an optical disc to which the present invention is applied.

FIG. 2 is a diagram illustrating a state in which simultaneous recording / reproduction is performed on the optical disc in units of 4 Mbytes.

FIG. 3 is a diagram showing an example of zoning in the optical disc.

FIG. 4 is a configuration diagram of a sector on the optical disc.

FIG. 5 is a block diagram showing a configuration of a mastering device for manufacturing the optical disc.

FIG. 6 is a block diagram showing the configuration of the optical disk recording / reproducing apparatus.

FIG. 7 is a configuration diagram of an ECC block cluster in the optical disc.

FIG. 8 is a configuration diagram of an ECC block in the optical disc.

[Explanation of symbols]

1 optical disk, 20 recording / reproducing device, 24 servo circuit

Claims (4)

[Claims] 1. A sector is composed of a header area having an address and a recording area, a track is composed of a plurality of sectors, an ECC block is composed of a plurality of sectors, and a plurality of ECC blocks are a unit of recording / reproduction. An optical disk having a disk format. 2. A sector structure in which a data recording surface is divided concentrically to form a plurality of zone structures, and the data recording surface is divided into radial regions for each zone. 2. The optical disc according to claim 1, wherein the recording / reproducing unit is an integral multiple of the number of sectors per a plurality of ECC blocks. 3. An optical disk in which a sector is composed of a header area having an address and a recording area, a track is composed of a plurality of sectors, and an ECC block is composed of a plurality of sectors, is a disk having a plurality of ECC blocks as a unit. A recording / reproducing method for an optical disc, characterized by recording / reproducing data in a format. 4. The optical disc has a sector structure in which a data recording surface is divided concentrically to form a plurality of zone structures, and the data recording surface is divided into radial regions for each zone. Recording / recording of data in a disk format in which the number of tracks is an integral multiple of the number of sectors per ECC block as the recording / reproduction unit.
4. The recording / reproducing method for an optical disk according to claim 3, wherein reproduction is performed.