JP3092707B2 - optical disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical disc,
In particular, the present invention relates to a rewritable optical disk having a control data signal indicating the type of the disk.

[0002]

2. Description of the Related Art In recent years, various types of optical disks, such as a read-only type such as a CD / CD-ROM, a write-once type for recording data, and a rewritable type, have been widely used. Among these, for example, there are types that have exactly the same outer shape of the disk, but are of a read-only type, a write-once type, and a rewritable type.

[0003] Also, the type of disc format,
Some optical disks have different parameters set during recording or reproduction. Therefore, information for setting the type of the disk and various parameters is recorded as a control data signal in a predetermined area on the disk. These control data signals need to be read by the drive device before performing various settings of the drive device for reproducing / recording the optical disk.

Next, a method of recording a control data signal will be described with reference to a "130 mm rewritable optical disk" as an example. “130mm rewritable optical disk” is based on “JISX627
1 "defines the format. As a format, a continuous groove is formed in a spiral shape on the disc,
There are an A-type format in which a signal is recorded using the land between the grooves as a track, and a B-type format in which a mark for a sample is formed on a disk and tracking control is performed by a sample servo method. A control information track for recording a control data signal is common to both formats, and includes a PEP area, an inner peripheral SFP area, and an outer peripheral S area.
It is specified that an FP area be provided.

[0005] First, the PEP area is located at the innermost periphery of the disk, and a prerecord mark (also referred to as emboss pit) modulated by a low frequency phase modulation recording code is used.
All marks in the PEP area are radially aligned. This is schematically shown in FIG. The prerecord mark and its gap (space) are two channel bits long. One PEP bit cell has a length of 656 plus or minus one channel bit. Referring to FIG. 4, the information of the PEP bit cell is a phase modulation recording code. When the mark group is in the first half of the PEP bit cell, it represents a logical 0, and when it is in the second half,
Represents a logical one. In this way, 561 to 567 PEP bit cells are recorded per track.

The track format of the PEP area includes three sectors 177 as shown in FIG. 5A. FIG. 5B shows each sector format. The numbers shown in the figure are the number of PEP bits allocated to each signal. The data section for recording various control signals has a capacity of 18B (144 PEP bits). For example, which format (A type,
B)) is recorded. The contents of the other control signals are described in the JIS standard, and thus the description is omitted.

When irradiating light to the PEP area with an optical head or the like, focus control is performed to focus the light on the signal recording surface of the disk. In the PEP area, since the marks are formed by being aligned in the radial direction, signals can be reproduced without performing tracking control.

FIG. 3A shows an example of a beam locus. The area where no mark is formed becomes a mirror surface, and the amount of reflected light from the disk is large. In the area where the mark is formed, the reflected light is diffracted depending on the presence or absence of the mark, and the average level is lower than that in the case of the mirror surface.

FIG. 3B shows the change in the amount of reflected light. PE
Since the mark repetition frequency is higher than the period of the P bit cell, the mark signal component is removed by limiting the band of the reproduction signal. This waveform is shown in FIG.
By comparing the levels of the reproduced signals, the information of the PEP bits can be detected.

Next, the inner and outer SFP regions will be described. The same content is recorded in the inner and outer SFP areas. In both SFP areas, pre-record marks are recorded in a standard user data format.
512B is defined as a control data signal. For example, in bytes 0 to 17, the same information as in 18B recorded in the PEP area is recorded. Since the contents of other control information are described in the JIS standard, the description is omitted.

FIG. 6 shows a standard user data format when the user data capacity is 512B in the A type format. The numbers shown in the figure are the number of bytes (B) allocated to each signal. An error correction code, a resynchronization byte, and a control byte are added to the 512B user byte, and the data area has a capacity of 650B.

A sector for recording a signal in the data area includes a sector mark (SM) indicating the head of the sector, a VFO area for synchronizing clock reproduction, an ID area indicating a sector address, and an ID area. A prerecorded address portion such as an address mark (AM) indicating the head and an offset detection area (OD) for rewriting data.
F), it is necessary to add each area such as an ALPC used for checking the laser output and a buffer area so as not to overlap the subsequent sector.

Thus, the total sector capacity is 746B. As described above, the control data recorded in the SFP area is a pre-record mark, but according to this user data format, a capacity of 746B is similarly required to record various control signals of 512B.

In recent years, a read-only optical disk in which digitized and compressed video and audio are recorded has been proposed.
FIGS. 7A to 7C show an example of a sector format of a read-only optical disk proposed as a DVD.

Information data such as video and audio is 2048B
It is recorded in one sector in units. This is called a first data signal. Data I indicating an address such as a sector number
D = 4B, IED = 2 for error detection of data ID
B, 6B of RSV is added as a spare area, and 4B of EDC is added to perform error detection for all of them.
These are collectively referred to as a first data unit. This configuration is shown in FIG. This data length is 2048 + 4
+ 2 + 6 + 4 = 2064 (B).

The information data section (2048B) is scrambled. A method of scrambling is to configure a shift register to generate so-called M-sequence data,
An initial value is set to this, and the data is sequentially shifted in synchronization with the data to generate pseudo-random data. By taking an exclusive OR of this and the information data to be recorded for each bit, the information data section (2048B) is scrambled.

The first data units having undergone the scramble processing are collected for 16 sectors, and constitute an error correction code based on the Reed-Solomon code. Data units for one sector are arranged in 172B × 12 rows, and collected for 16 sectors to form an array of 172B × 192 rows. An outer code of 16B is added to each column. Then 10 in each row
The inner code of B is added. Thereby, 182B × 20
An eight-row data block (37856B) is configured.
This is called an ECC block. This configuration is shown in FIG.

Next, interleaving is performed so that the outer code of the 16B row is included in each sector. The data of each sector is 182B × 13 rows = 2366B.

Next, modulation is performed using the recording code. As a recording code, an RLL code with a restricted run length after modulation is used.
Here, an 8/16 conversion code for converting 8-bit data into 16 channel bits is used as a recording code.
This conversion is performed according to a predetermined conversion table. A detailed control method is omitted. By controlling the code selection, the DC component included in the recording code can be suppressed.

At this time, the shortest bit length is limited to 3 channel bits, and the longest bit length is limited to 11 channel bits. Also, a synchronization code is inserted to synchronize at the time of reproduction. A 2B synchronization code is inserted for every 91B, which is half of 182B for one row. As the synchronization code, several kinds of 32-channel bit length codes having patterns that do not normally appear in the 8/16 conversion code are determined in advance. The cycle of 93B in which the synchronization code is inserted is called a frame. This configuration is shown in FIG. Thus, the data of one sector is 186B × 13 rows = 2418B.

In a single-layer DVD read-only disc on which a signal is recorded, data is recorded by forming pits at a constant linear velocity (CLV driving) from the inner peripheral portion to the outer peripheral portion in accordance with this sector format. Will be done. Further, a disc having a two-layered surface on which a signal is recorded has also been proposed, but description thereof will be omitted.

FIG. 8 shows the arrangement of recording signal areas on a DVD reproduction-only disc. There is a lead-in area at the innermost circumference of the disc, starting from a radius of 22.6mm. The data area where information data such as video and audio are recorded
It starts at 24.0mm and lasts up to a radius of 58.0mm. A lead-out area is provided following the data area. The maximum radius of the lead-out area is 58.5mm. Set the sector address of the first sector of the data area to 30,000 in hexadecimal (300
0h), and the sector address is 1 toward the outer periphery.
Increase by 1h for each sector. In the lead-in area, the sector address decreases by 1h for each sector toward the inner periphery.

Control information such as control data is recorded in the lead-in area in the sector format described above. In the lead-in area, reference codes are recorded in two ECC blocks with sector numbers from 02F000h to 02F020h. The reference code is used for identification and adjustment of the disc manufacturer. Control data is recorded in 192 blocks of sector numbers from 02F200h to 02FE00h. In the other sectors of the lead-in area, information data is recorded in the same sector format as that described above as 00h.

On the other hand, a rewritable DVD disk having a format compatible with the above-mentioned read-only DVD disk has been proposed. In a rewritable optical disk, spiral or concentric grooves are provided on a disk base material, a recording film is formed on the base material, and tracks are set along the aforementioned grooves.
In order to increase the recording capacity, both the groove portions (referred to as grooves) and the inter-groove portions (referred to as lands) of the spirally formed grooves are used as recording tracks.

As a unit for recording and reproducing data, a track is divided into a plurality of sector areas. By adding address information to each sector, the position of necessary information data is managed, and data search can be performed at high speed. At the head of the sector area, a header area including an ID signal indicating address information of the sector is provided.

In order to ensure compatibility with a read-only DVD disk, the data 2418B of one sector of the read-only DVD disk described above is used as it is in a rewritable DVD disk.
The format is such that it can be recorded in the user data area of the sector. This is called a second data signal.

The sector format of a rewritable DVD disk is the same as that of the above-mentioned JIS standard optical disk.
An ID area indicating a sector address number and a buffer area are required. It is preferable that the capacity of the entire sector including these areas be an integral multiple of the frame length (93B) of the format for reproduction only.

A rewritable DVD satisfying the above requirements
FIG. 9 shows an example of a disk format. 2048B
(The first data signal) is the reproduction-only DV
Formatting is performed in the same manner as the D disk, and data of one sector is converted into 2418B (second data signal) and recorded in the data area 91 in the sector layout shown in FIG. Following the data area 91, the postamble area 92 is 1
B is arranged. In the above 8/16 conversion code, it is necessary to terminate the code at the end of the recording code in order to correctly decode the data at the time of decoding. A pattern according to a modulation rule is recorded from a predetermined code.

Further, a PS area 93 for recording a pre-sync signal is provided in front of the data area to indicate the start point of the data area and to achieve byte synchronization. The presync signal has a length of 3B (48 channel bits) and a code having a pattern with high autocorrelation. PS area 93
Is provided with a VFO region 94 before. The VFO area 94 is an area for recording a signal of a specific pattern in order to quickly and stably operate the PLL pull-in of the reproducing circuit.

The signal of the specific pattern is, for example, a repetition pattern of four channel bits. If represented by an NRZI code, a pattern "... 1000 1000 ..." is used. The length of the VFO area 94 is 35B in order to secure the number of inversions and the pull-in time necessary for stable clock pull-in.

A first guard data area 95 is provided before the VFO area 94, and a second guard data area 96 is provided after the PA area 92. For rewritable recording media, recording,
When erasure is performed repeatedly, the deterioration at the start and end of the recording unit is increased. The guard data area must have such a length that the deteriorated portion does not extend from the VFO area to the PA area. According to the result of the experiment, the first guard data area may have a length of 15B, and the second guard data area may have a length of 45B. The data to be recorded is, for example, a 4-channel bit repetition pattern "... 1" similar to the VFO area.
000 1000 ... ".

The gap region 97 is used for setting a laser power. The length of the gap region 97 is 10B in order to secure the time required for setting the laser power. The buffer area 98 is for providing a time width during which recording is not performed so that the end of the recording data does not overlap with the next sector even when the rotation of the disk motor fluctuates or the disk is eccentric. The length of the buffer area 98 is 40B.

The above area is an area for recording rewritable data and has a length of 2567B. The signal recorded in this area is called a third data signal.

The length of the mirror area 99 is 2B in order to secure the time required for determining the offset of the tracking servo.

Next, the layout of the header area will be described. As shown in FIG. 9, the header area is readable on both the groove track and the land track.
The first half portion 19 and the second half portion 20 are arranged so as to be shifted from the center line of the groove by approximately one quarter of the pitch of the groove in the radial direction. The first half 19 and the second half 20 are shifted from each other so as to be opposite to the center line of the groove. In FIG. 9, four sector ID signals (PID) are arranged in the header area. For example, when the sector of the groove continues, the first half PID1 and PID2 are displaced toward the outer periphery of the disk, and the second half PID3 and PID4 are arranged.
Is displaced toward the inner peripheral side of the disk.

Each sector ID signal PID is provided with 4B of a Pid area indicating address information of the sector. 3B is allocated to the sector number, and 1B is allocated to various information of the sector such as the number of the PID area. The address information of the sector of the groove located on the extension of the center line of the displaced sector identification signal is recorded in the Pid3 area 113 and the Pid4 area 118.

The address information of the sector of the land adjacent to the outer peripheral side of the groove is the Pid1 area 103, Pid2
Recorded in the area 108. The error detection code of each Pid is 2
B, which is added to each IED area 104, 109, 11
4, 119. Data in the Pid area and the IED area are modulated by the above-described 8/16 conversion code. In order to terminate the modulation code, the postamble area 1
05, 110, 115, and 120 are respectively arranged by 1B.

Before the Pid area, the start point of the Pid area is indicated, and AM areas 102, 107, 112, and 117 for recording an address mark signal for byte synchronization.
Is provided. The address mark signal has a length of 3B (48 channel bits), and a code having a pattern that does not appear in the 8/16 conversion code is predetermined.

At the beginning of each sector ID signal PID, VF
An O region is provided. Similar to the above-mentioned VFO area, a repetition pattern of four channel bits of "... 1000 1000 ..." is used. As described above, the header area is composed of the first half PID1 and PID2, and the second half PID.
ID3 and PID4 form a set and are displaced in the radial direction. Since it is necessary to be able to re-establish bit synchronization, the first VFO areas 101 and 11 at the beginning of each set
The length of one VFO region is increased. Second VFO region 1
The lengths of the VFO areas 06 and 116 may be short because they only resynchronize. For example, the first VFO area is 36
B, the second VFO area is 8B.

As described above, the rewritable DVD disc 1
The length of the sector is 2697B. The length of one sector of a rewritable DVD disc is one of that of a read-only DVD disc.
The length is increased by 279B (for three frames) compared to the length of the sector.

[0041]

As described above, the rewritable D
In the case of a VD disc, like a read-only DVD disc,
It is necessary that control data signals indicating various types of control information be recorded in advance. Even with rewritable DVD discs,
As in the case of the above-described "130 mm rewritable optical disk", it is conceivable to record a control data signal in the same sector format as that of the "130 mm rewritable optical disk" using a prerecord mark. As mentioned above, rewritable DVD
The length of one sector of the disc is at least 10% larger than the length of one sector of the read-only DVD disc. The control data signal is recorded at the time of manufacturing the disc and does not need to be rewritten. This increase in the sector length is an unnecessary increase for recording the control data signal. For this reason, when recording the control data signal, the unnecessary increase in the sector length is a major problem in DVD discs requiring a large capacity.

Further, a drive device for a DVD disk is required to have compatibility for recording or reproducing both a read-only DVD disk and a rewritable DVD disk. However, a read-only DVD disc and a rewritable DVD
The disc has a different sector format. By reading the control data signal, the type of the disc can be identified. However, in order to read the control data signal, it is necessary to identify the format in order to find the recording position.

In order to identify the type of the disc, as in the PEP area in the aforementioned “130 mm rewritable optical disc”,
It is conceivable that an area of the same sector format is set for the read-only type and the rewritable type using the prerecord mark, and a signal for identifying the type of the disk is recorded therein. When the disc is started, the common area is reproduced first, and if the type of the disc is identified, control data can be reproduced according to the format of each disc. However, as in the case of the above-mentioned "130 mm rewritable optical disk", the signal for identifying the type of the disk to be recorded in the common area is a signal to be recorded as a part of the control data signal. When the same control data signal is recorded in two areas, the recording area becomes redundant. The fact that the recording area is redundant means that a DVD with a large capacity is required.
This is a major issue as a disc.

In view of the foregoing, the present invention records a control data signal in a format that can be easily read as a DVD disk in both a read-only type and a rewritable type, reduces redundant areas, and improves recording capacity. It is an object of the present invention to provide an optical disk which enables the optical disk.

[0045]

The optical disk of the present invention comprises:
A read-only area with multiple read-only tracks
A rewritable area in which a plurality of rewritable tracks are formed and
An optical disc having a plurality of read-only tracks.
Each of the blocks is divided into a plurality of first sectors.
And at least one of the plurality of first sectors includes:
A signal having a predetermined playback format is recorded in advance
And each of the plurality of rewritable tracks is
Divided into a second sector and the plurality of second sectors
At least one of them has a predetermined recording format.
Signal can be recorded, and the predetermined recording format
The predetermined format is the predetermined recording format.
Included as part of the mat, the playback-only area,
The rewritable disk is located on the inner peripheral side of the optical disk.
The rear is located on the outer peripheral side of the optical disc,
Thereby, the above object is achieved. In the playback-only area
A pit row is formed, and the rewritable area has a spa
An annular or concentric groove is formed.
The depth of the row may be substantially equal to the depth of the groove.
Each of the plurality of first sectors is a half of the optical disc.
They may be radially aligned. The plurality of first sectors
May be 18 sectors per revolution. The regeneration
Sector for recording control data signal in dedicated area
Address of the read-only optical disk
The same as the address of the sector for recording the data signal
And may be a feature. The first section of the rewritable area
Address of the data on the read-only optical disk.
The address is the same as the address of the first sector of the
May be. Radius of the first sector of the rewritable area
Position at the beginning of the data area on the read-only optical disc.
It may be characterized as being the same as the radial position of the sector.
No. The error correction block of the plurality of first sectors
A number of first sectors equal to an integer multiple, and
For the first sector within one round of the rack, playback adjustment is performed.
Reference signal for
No.

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

[0063]

[0064]

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

As an embodiment of the present invention, a rewritable DVD disk having a format compatible with the above-described read-only DVD disk will be described. FIG. 2 shows the outer shape of the optical disk. FIG. 2 shows an optical disc 1, a center hole 2, and a rewritable area 3 for recording data. A spiral groove is formed in the rewritable area 3 for recording data.
Grooves (grooves) and lands (between grooves) are used as tracks. Reproduction only area 4 inside rewritable area 3
Is provided. In the present embodiment, a control data zone 5 in which control data indicating various kinds of detailed information of a disc is recorded is provided in the reproduction-only area 4.

In the read-only area 4, the sector format shown in FIG. 7 is used. 2048B
Are added to the first data signal of
Along with error correction codes and synchronization codes for resynchronization,
418B of sector length data are configured. This data is formed on the disk in advance as a pit string.

On the other hand, as the sector format in the rewritable area 3, the format shown in FIG. 9 is used. User data is divided as a first data signal in units of 2048B. This is used as a second data signal of 2418B having the same configuration as that of the read-only format (FIG. 7). Data for making it rewritable is added to this to make a third data signal of 2567B. An area where this can be recorded is taken on the track, and a header area of 128 B and a mirror area of 2 B are added to make a total of 2697 B
A rewritable sector area having a sector length of In other words, this format is the format of a read-only DVD
This is a format in which sector data 2418B can be directly recorded in a user data area of one sector of a rewritable DVD disc.

In the header area in the rewritable area, the address numbers of the adjacent sector of the groove and the sector of the land are indicated. The first half 19 and the second half 20 are shifted in the radial direction by one and are shifted in the opposite direction with respect to the center line of the groove.

Therefore, it is necessary to arrange the header area so as to be aligned in the radial direction of the disk. Such a sector arrangement has the disadvantage that the number of sectors in one round of the track is the same on the inner and outer circumferences of the disk, and the recording density on the outer circumference decreases.

Therefore, the rewritable area is divided into a plurality of zones. Within the zones, the number of sectors in one round of the track is the same, and the number of sectors is increased by one every time the disk goes from the inner zone to the outer zone. Let it.

For example, when recording on a phase change recording material in the format shown in FIG. 9 using a semiconductor laser having a wavelength of 650 nm and an objective lens having an NA of 0.6, a shortest bit length of about 0.41 μm can be realized. If the radial position of the innermost peripheral portion of the rewritable area is set to 24.0 mm, which is almost the same as the data area of the read-only disc, 17 sectors can be formed in one round.
If the shortest bit length is set to the same level and the number of sectors is increased by one in each zone, 24 zones can be obtained in a disk having a radius of 12 cm, and the outermost zone can be configured to have 40 sectors in one circumference. In this case, the user data capacity in all zones is about 2.6 GB.

When recording / reproducing data on or from a disk on which sectors are arranged as described above, the disk is rotated at a constant rotational speed, and the recording / reproducing frequency is changed for each zone.
There are a CAV drive method and a ZCLV drive method in which the rotation speed is changed for each zone so that the linear velocity between the zones is substantially constant, and the rotation speed is fixed within the zone.

A mastering process for creating a disc having such a format will be described. Mastering is performed by rotating a glass plate coated with a photosensitive agent (resist) and recording a signal according to a format using a light source having a short wavelength such as a gas laser.

The laser light from the light source is passed through an EO modulator or the like. When an electric signal according to the above-described format is applied to the EO modulator, the light intensity of the passing light is modulated. This is condensed by an objective lens, and is irradiated on the above-mentioned glass plate to expose a photosensitive agent.

Next, by developing the glass plate, prerecorded pits and grooves are formed on the plate. Plating is performed based on this resist master to create a metal master. A resin disk base is manufactured based on the metal master, but detailed description is omitted. In the above-described mastering step, a turntable that rotates the glass plate has a large inertial force in order to rotate with high precision. Therefore, it is difficult to instantaneously change the rotation speed during mastering.

As described above, in this embodiment, as shown in FIG. 2, the read-only area 4 is provided in the inner peripheral portion of the disc. In the read-only area 4, the same sector format as that of the read-only DVD disk is used.

However, as described above, the read-only DVD disk is driven by the CLV drive in which the linear velocity becomes constant. The rewritable DVD disk is driven by MCAV drive or ZCLV drive as described above.
If different drive systems are used for the read-only area and the rewritable area of the rewritable DVD disk, the number of rotations will be switched. However, as described above, it is difficult to switch the rotation speed during mastering of the disk.

For this reason, in this embodiment, the read-only area is also recorded with the disc rotation speed kept constant. MCAV drive and ZCLV drive are used for the read-only area of the manufactured disc, as in the rewritable area. When the arrangement of the sectors in the read-only area is set to such a method in which the number of rotations is fixed, the cycle in which each sector is reproduced is also fixed. Therefore, even if the address of the sector cannot be reproduced, it is easy to interpolate from the positions of the preceding and following sectors.

Further, the thickness of the photosensitive agent applied to the glass plate used in the mastering step is made substantially uniform. In a rewritable disc, this thickness corresponds to the depth of the groove.

For example, the depth of the groove is determined so as to be optically about λ / 8 so as to increase the tracking signal. On the other hand, in a read-only disc, the depth of the groove is
It is optically determined to be approximately λ / 4 so as to correspond to the depth of the pit and to increase the contrast of the reproduced signal, and is deeper than the groove. As described above, it is difficult to change the depth of the grooves and pits between the read-only area and the rewritable area on the same disk. Therefore, in the present embodiment, the depth of the pit in the read-only area is substantially equal to the depth of the groove in the rewritable area.

That is, the depth of the pit in the read-only area is equal to the depth of the pit in the read-only disc (optically about λ
/ 4) Make it shallower. Therefore, since the contrast of the reproduction signal cannot be increased, the length of the shortest pit is made longer than that of a read-only disc. For example, the length of the shortest pit is 0.41 μm, which is the same bit length as the rewritable area.

In this embodiment, the sector format differs between the rewritable area and the read-only area. Its length is 2418B in the reproduction-only area and 2697B in the rewritable area. As described above, the innermost zone of the rewritable area has a configuration of 17 sectors per round. The number of sectors in the read-only area when the shortest bit length is almost the same can be obtained by the following equation.

17 × 2697/2418 = 18.9.
Since the read-only area is located on the inner periphery of the rewritable area and the number of sectors in one round is an integer, an integer not exceeding the above value is taken, and the number of sectors in the read-only area is set to 1
The circumference is 18 sectors.

In this embodiment, the track pitch is substantially the same in the rewritable area and the read-only area. FIG. 10 schematically shows a track at the boundary between the rewritable area and the read-only area. (A) is a reproduction-only area,
(B) shows a rewritable area. A pit 11 prerecorded in the reproduction-only area is shown. Track pitch 12
Is determined by the magnitude of crosstalk of the reproduced signal. For example, in a read-only DVD disk, the track pitch is 0.74 μm.

In the rewritable area (b), the groove 14
Is formed. The groove is used as a groove track 17, and the space between the grooves is used as a land track 18. The track pitch 13 indicates an interval between a groove track and a land track. The track pitch 13 is substantially the same as the track pitch of the read-only area.

Therefore, the pitch of the groove is doubled. Further, the track widths of the groove track and the land track are set to be substantially the same. For this reason, it is necessary to make the groove width and the track pitch approximately equal. In the above-mentioned mastering step, in order to form a groove having a wide width, it is necessary to make the laser beam to be recorded thicker in the radial direction.

In the read-only area, if recording is performed with a wide beam, the width of the pits becomes large and approaches the pits of the adjacent track. For this reason, crosstalk of the reproduction signal increases. Therefore, two beams are used: a laser beam for recording a small pit in a read-only area and a wide laser beam for forming a groove in a rewritable area.

However, when switching between the pit laser light and the groove laser light at the boundary between the rewritable area and the read-only area, the positions of the two laser lights on the disk surface are shifted. If it is, the recorded pit row and groove are not continuous, and overlap or separate. It is practically difficult to match the spot positions of the two laser beams on the disk surface two-dimensionally. Therefore, the boundary between the rewritable area and the read-only area cannot be connected at the same track pitch as in each area.

In the reproduction-only area,
Since pit strings are recorded continuously, errors accumulate on the outer peripheral side of the read-only area, and the position of the end of the last sector may change.

Therefore, in the present embodiment, a connection zone is provided at the boundary between the rewritable area and the reproduction-only area. FIG. 10C shows a first example of the connection zone. A first example of a connection zone is:
Since there is no need to record signals, a flat (mirror) portion is provided. As described above, the alignment of the two beams is practically possible when the width of the connection zone is 1 μm or more.

If the width of the connection zone is widened, when reproducing the manufactured disc by a drive, when servo of laser light is applied to the connection zone, no tracking error signal is generated and the operation is not performed. Become stable. When the manufactured disk is mounted on a drive and rotated, some eccentricity occurs. If the range (radial width) of the mirror section is made smaller than the minimum value of the eccentricity, the laser beam of the drive must be provided in a pit row of the read-only area or a groove of the rewritable area during one rotation. Will cross. The allowable value of the eccentricity of a normal disk is about ± 50 μm at the maximum. Therefore, as the minimum value, the width of the mirror portion in the radial direction may be about 5 μm. From the above, the radial width of the mirror portion is equivalent to 2 to 8 tracks in terms of the track pitch. FIG. 10 shows a track 15 virtually.

Next, a second example of the connection zone according to the present invention will be described. First of the aforementioned connection zone
In the above example, the connection zone is a mirror unit, but in the second example of the connection zone, dummy data is recorded in the connection zone. As dummy data, for example, "... 1000100" as in the VFO area shown in FIG.
0 ... "is used.

The dummy data is formed in a range of 2-3 tracks along the track 15 shown in FIG. After this, a groove having no header area of 1-2 turns (2-4 tracks) is recorded, and then a sector having a header area is formed. As described above, even if the position of the spot of the laser beam is displaced in the range of about 1 μm, only the dummy data and the vacant groove overlap, and the necessary data is not destroyed. By forming such a pit row, a tracking error can be stably detected even in the connection zone.

Further, as a third example of the connection zone according to the present invention, a case where the dummy data of the connection zone has a sector configuration will be described. As the dummy data of the read-only area, for example, the sector shown in FIG. 7 in which the first user data is all 00h is configured. A groove having a header area shown in FIG. 9 is formed as dummy data of the rewritable area. As in the other examples described above, even if the position of the spot of the laser beam is displaced in the range of about 1 μm, only the sector portions of the dummy data overlap, and the necessary data is not destroyed.

Further, even if a sector that cannot be partially read occurs, there is no problem because the data is originally dummy data. The address of the sector belonging to this connection zone can be set in advance so as not to be used. By forming such a sector row, a tracking error is stably detected even in the connection zone.
Further, since the sector address can be detected, the position on the disk can be known, and the system management becomes easy.

FIG. 1 shows a layout of each area in the rewritable optical disk according to the embodiment of the present invention. FIG.
Representing the name of each area, its approximate radial position, the address of the start sector of each area, the number of blocks included in each zone, the number of tracks, and the logical address of data from the inner circumference to the outer circumference of the disk It is a list | wrist which shows a data ID number. The address number of the sector indicates the physical address of the sector, and is recorded in the Pid area of the header area in the rewritable area, and is recorded as the data ID number in the sector of the read-only area.

The data ID number indicates a logical address of data recorded in the sector. In the lead-in area and the lead-out area, the physical address and the logical address of the sector are the same. In the rewritable sectors in both areas, the data ID number included in the rewritable data area (second data signal area) is the same as the physical address of the sector. On the other hand, the sectors provided in the data area are all rewritable sectors. The data ID number indicates a logical address of data recorded in the sector.

In FIG. 1, there is a read-only area on the inner periphery of the disc. The innermost circumference of the disc is a read-only DV
It starts with a radius of 22.6mm, just like the D disk. The rewritable area starts with a radius of 24.00 mm, like the data area on a read-only DVD disc. The entire area outside is a rewritable area.

The address of the first sector of the rewritable area is assumed to be 30,000 in hexadecimal (represented as 30,000h), and the address increases by 1h toward the outer periphery for every one sector. The address of the read-only area is decreased by 1h for every sector from the address 30,000 toward the inner periphery. ECC from beginning of rewritable area
There are provided 256 blocks (4096 sectors) of areas for use in testing disks and drives. The area from the innermost periphery to this point is the lead-in area.

The next is a data area for recording and reproducing user data. As described above, the data area is divided into 24 zones from zone 0 to zone 23. The address of the first sector of the data area is 31
000h address. Next to the data area is a lead-out area.

Next, each area will be described in detail.

In the read-only area of the lead-in area,
A reference signal zone for recording a reference code is provided in one ECC block having a sector number of 02F000h to 02F010h. The reference code is used to record a signal used for discrimination and adjustment by a disc manufacturer. Sector numbers from 02F200h to 02F
A control data zone for recording a control data signal is set in 192 blocks up to E00h. The other area of the read-only area is a blank zone, and the first data signal is recorded in each sector in the same sector format as 00h.

As described above, by setting the sector number of the control data zone to be the same as that of the above-mentioned read-only DVD disk, the same sector address is always sought even in a drive device corresponding to both disks. The control data signal can be reproduced from the sector at the same address. Therefore, the drive devices corresponding to both disks can perform the start-up operation on the two types of disks in the same procedure.

[0104] A connection zone is provided following the reproduction-only area so as to allow a smooth transition to the rewritable area. In the first example of the connection zone described above, the connection zone includes 2-8
A mirror unit for the track is provided. No signal is recorded on the mirror unit. Therefore, the area before the address 30000h of the first sector of the rewritable area is the last sector of the blank zone of the read-only area. The address of this sector
Address 2FFFFh. 2F following control data zone
32 blocks from address E00h to address 2FFFFh are blank zones.

The second connection zone described above
Also in the example, the connection zone forms the dummy data having no sector address and the empty groove as described above.
For this reason, the address of the connection zone can be the same address as in the first example of the connection zone.

Next, in the third example of the connection zone, since the dummy data has a sector configuration, it is necessary to set in advance the addresses of the sectors belonging to this connection zone so that they are not used. It is desirable that the connection zone has an integer number of tracks and corresponds to an integer number of blocks.

For example, if the number of tracks provided in the connection zone is eight, the connection zone can correspond to nine blocks. In this case, the number of blocks in the immediately preceding blank zone is reduced by 9 blocks,
There are 23 blocks (addresses 2FE00h to 2FF6Fh). In this case, the connection zone is increased by 9 blocks. In other words, in the connection zone, 2F
The area up to address FFFh is added. Therefore, the connection zone is an area from address 2FF70h to address 30000h.

In the first and second examples of the connection zone, no address is assigned to the connection zone. However, even if the connection zone has no sector structure, the address is assigned in the same manner as in the third example of the connection zone. It is possible to assign

Following the connection zone, a rewritable area of the lead-in area is provided. Initially, a guard track zone is provided. The address of the first sector is the address 30000h. Guard track zone is 30
There are 32 blocks up to address 1FFh. This zone is for preventing other data from being destroyed by an error such as a track gap when a test signal is recorded in a test zone described below. No data is recorded in the sector of this zone.

The next 64 from address 30200h to address 305FFh
The block is provided with a disk test zone, which is used for a quality test or the like by a disk manufacturer. Next 30600h
A drive test zone is provided in 112 blocks from the address to the address 30CFFh, and is used for a test such as setting of laser power in a drive device. A guard track zone is provided in the next 32 blocks from addresses 30D00h to 30EFFh, and has the same function as the above-described guard track zone. A disk identification zone is provided in the next eight blocks from addresses 30F00h to 30F7Fh, and is used for recording copy management information. From the next address 30F80h
Eight blocks up to the address 30FFFh are provided with DMA zones, which are used for disk defect management.

A data area is provided from the next address 31000h. As described above, the data area is divided into 24 zones from zone 0 to zone 23. Each zone consists of 1888 tracks. However, zone 0
As described above, there are 1647 lines because 256 blocks (4096 sectors) from the beginning are used as the lead-in area.
An example of the number of blocks included in each zone is shown in the table of FIG.
About 95% of these are used as data blocks for recording user data. The logical address of each sector included in this data block is an address obtained by adding the logical address to the physical address of the first sector of the data area (address 31000h in this embodiment).

At the beginning and end of each zone, 48 to 80 sectors (two or more tracks in each zone) are allocated as buffer sectors. This area has a sector where the header area is discontinuous at the zone boundary,
No data is recorded. Most of the remaining 5% are spare sectors. The spare sector is used to replace a recording sector when a defect occurs in a sector in the data block.

By performing such replacement, the physical address of the sector to be recorded is replaced. However, as described above, the logical address (data ID number) of the user data does not change. Therefore, a correspondence table between the physical address and the logical address of the sector is created, and the correspondence table is recorded in the DMA zone.

[0114] A lead-out area is provided from the address 16B480h following the zone 23 to the outermost periphery. The lead-out area is assigned a zone substantially similar to the rewritable area of the lead-in area. The beginning of the lead-out area is the DMA zone. As before, the DMA zone is used for defect management of the disk. DMA1 & 2 on the inner circumference side and DMA3 on the outer circumference side across the data area
DMA zones are used in a total of four locations of & 4. Next 16
Eight blocks from address B500h to address 16B57Fh are used for recording copy management information in a disc identification zone.

[0115] 3 from the next address 16B580h to 16B77Fh
Two blocks are guard track zones in which no data is recorded. 11 from the next address 16B780h to 16BE7Fh
Two blocks are used in a drive test zone for tests such as setting of laser power in a drive device. The next 112 blocks from addresses 16BE80h to 16C57Fh are used in a disk test zone for quality tests and the like by a disk manufacturer. The next 3343 blocks from addresses 16C580h to 17966Fh are guard track zones, in which no data is recorded.

As described above, according to the layout of each area of the optical disc according to each embodiment of the present invention, the rewritable area starts with a radius of 24.00 mm as in the data area of the read-only DVD disc. The address of the first sector of the rewritable area is the same as the address of the first sector of the data area on a read-only DVD disc. The address of the sector in the control data zone is the same as the control data zone of the read-only DVD disc. Therefore, even in a drive device corresponding to both disks, the same sector address can always be sought and the control data signal can be reproduced from the sector having the same address. Therefore, the start-up operation can be performed on the two types of disks in the same procedure. As a result, drive control can be made more efficient.

The layout of the rewritable area according to the present invention will be described. The logical address of each sector included in the data block of the data area is the same as the address of the sector of the data area on the read-only DVD disc. The address of the first sector of the data area on the read-only DVD disc is 30000h. The physical address of the first sector of the data area in the rewritable area is 31000h.

In the present embodiment, the logical address of the first sector is set to the address of 30000h so that it is the same as the logical address of the first sector of the read-only DVD disk. The logical address of each sector included in the subsequent data blocks is
Logical address of the first sector (address 30000h in this embodiment)
To the logical address.

With such an address setting, the logical address of each sector included in the data block overlaps with the address of a sector in the rewritable area of the lead-in area. However, by recording the area type to which the sector belongs in the data ID number, it is possible to determine whether the sector is the lead-in area or the data area.

As described above, according to the present embodiment, the logical address of each sector of the data block included in the data area is the same as the address of the sector of the data area on the read-only DVD disc. Therefore, the same logical address can always be sought for the reproduction of user data even in a drive device corresponding to both disks, and the same procedure can be performed for two types of disks. As a result, the drive can be controlled efficiently.

In this embodiment, the case where the format shown in FIG. 7 is used as the sector format in the read-only area and the format shown in FIG. 9 is used as the sector format in the rewritable area will be described. However, it is not limited to these formats. For example, the sector format of the above-mentioned “130 mm rewritable optical disk” can be used.

[0122]

As described above, according to the present invention, the optical disk has a read-only area in which a plurality of read-only tracks are formed and a rewritable area in which a plurality of rewritable tracks are formed. Each of the plurality of read-only tracks is divided into a plurality of first sectors. A signal having a predetermined reproduction format is recorded in advance in at least one of the plurality of first sectors. Each of the plurality of rewritable tracks is divided into a plurality of second sectors. A signal having a predetermined recording format including the predetermined reproduction format can be recorded on at least one of the plurality of second sectors. The read-only area is located on the inner circumference of the optical disc, and the rewritable area is located on the outer circumference of the optical disc.

Accordingly, the control data signal is recorded in a read-only area having no area for recording header information. Therefore, the control data signal is recorded using the sector format of the first sector area provided in the read-only area, which has lower redundancy than the sector format of the second sector area provided in the rewritable area. Is done. As a result, the recording area of the rewritable optical disk can be made more efficient.

Further, according to the present invention, in an optical disk having compatibility with a read-only optical disk and having a plurality of rewritable areas and a plurality of read-only areas, each of the plurality of read-only tracks is It is divided into a first sector. A signal having a predetermined reproduction format is recorded in advance in at least one of the plurality of first sectors. Each of the plurality of rewritable tracks is divided into a plurality of second sectors. A signal having a predetermined recording format including the predetermined reproduction format can be recorded on at least one of the plurality of second sectors. The read-only area is located on the inner circumference of the optical disc, and the rewritable area is located on the outer circumference of the optical disc.

Therefore, the control data signal is recorded in the same sector format as the read-only optical disk in the read-only area provided on the inner peripheral portion of the optical disk as in the case of the read-only optical disk.

For this reason, a drive device corresponding to both the rewritable optical disk and the read-only optical disk cannot be used even if the rewritable optical disk is mounted.
Even when a read-only optical disk is mounted, both can be reproduced in the same sector format, control signals of both optical disks can be detected, and the optical disk can be started easily. As a result, it is not necessary to provide a special area such as the above-described PEP area in the rewritable optical disk.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a layout of each area in an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an outer shape of an optical disc in an embodiment of the present invention.

FIG. 3 is a schematic diagram showing an arrangement of marks in a PEP area in a conventional example.

FIG. 4 is a schematic diagram showing a format of a pit cell in a PEP area in a conventional example.

FIG. 5 is a schematic diagram showing a format of a PEP area in a conventional example.

FIG. 6 is a schematic diagram showing a sector format of an optical disc in a conventional example.

FIG. 7 is a schematic diagram showing a sector format in a read-only area according to the embodiment of the present invention.

FIG. 8 is a schematic diagram showing a layout of each area in a conventional read-only DVD disc.

FIG. 9 is a schematic diagram showing a sector format in a rewritable area according to the embodiment of the present invention.

FIG. 10 is a schematic diagram showing a boundary between a rewritable area and a read-only area according to the embodiment of the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Isao Sato 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-232831 (JP, A) 285232 (JP, A) JP-A-62-197929 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/30 G11B 20/12

Claims (8)

(57) [Claims] 1. An optical disc having a read-only area in which a plurality of read-only tracks are formed and a rewritable area in which a plurality of rewritable tracks are formed, wherein each of the plurality of read-only tracks is is divided into a first sector, at least in part of the first sector of the plurality of signal having a predetermined reproduction format it is recorded in advance, each of the plurality of rewritable tracks, a plurality A signal having a predetermined recording format can be recorded in at least one of the plurality of second sectors, and the predetermined recording format is the predetermined reproduction format. Format is included as part of the predetermined recording format. The read-only area is located on the inner circumference side of the optical disc, and the rewritable area is Optical disk, which is disposed on the outer peripheral side of the optical disc. 2. A pit row is formed in the read-only area, and a spiral or concentric groove is formed in the rewritable area, and the depth of the pit row is The optical disc of claim 1, wherein the optical disc is substantially equal to: 3. The optical disc according to claim 1, wherein each of the plurality of first sectors is aligned in a radial direction of the optical disc. 4. The optical disk according to claim 1, wherein the number of the plurality of first sectors is 18 sectors per round. 5. An apparatus according to claim 1, wherein an address of a sector for recording a control data signal in said read-only area is the same as an address of a sector for recording a control data signal on said read-only optical disk. The optical disc according to claim 2. 6. The read-only optical disk according to claim 1, wherein the address of the first sector of the rewritable area is the same as the address of the first sector of the data area on the read-only optical disk. The optical disc according to any one of the above. 7. The method according to claim 1, wherein a radial position of a first sector of the rewritable area is the same as a radial position of a first sector of a data area on the read-only optical disk. The optical disc according to any one of the above. 8. A first sector of a number equal to an integral multiple of an error correction block among the plurality of first sectors and within one turn of the read-only track, 3. The optical disk according to claim 1, wherein a reference signal for performing the adjustment is recorded in advance.