JPH11144257A - Optical disk and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce defective reading of address signal in a land and groove recording disk by arranging plural address blocks in address areas between adjacent groove track and land track and so as not to be contact to each other and arranging address blocks and mirror areas alternately in the address area in the circumferential direction. SOLUTION: In a groove track 13a, mirror areas 62, 64 whose lengths are equivalent to or equal to or longer than the length of an address block are respectively provided in between address blocks 21, 22 and hehind the block 22 and in a land track 12a, mirror areas 63, 61 whose lengths are equivalent to or equal to or longer than the length of the address block are respectively provided in between address blocks 23, 24 and in front of the block 23. Thus, since the adjacent tracks of respective address tracks are mirror areas, the leakage-in of reflected light quantities from the adjacent tracks is not present, a satisfactory reading of addresses is made possible without affected by crosstalk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an address arrangement in an optical disk for recording and reproducing data on both a land track and a groove track by irradiating a laser beam.

[0002]

2. Description of the Related Art In recent years, optical disk apparatuses have been actively developed as means for recording and reproducing large-capacity data.
Improvement of linear density by recording shorter marks,
Various approaches such as land / groove recording for recording data on both groove-shaped groove tracks and land tracks between grooves have been made.

Since a rewritable optical disk requires sector-by-sector management for data recording and reproduction, a guide groove for tracking control is formed and the address information of the sector is formed as pits when the disk is manufactured. There are many.

Therefore, for an optical disk capable of recording on both the land track and the groove track, it is necessary to provide a sector address for identifying the sector on both the land track and the groove track.

For example, a first conventional example is disclosed in
No. 729 describes an address setting method as shown in FIG.

In FIG. 2, for example, a groove track 13
a is provided with address blocks 21 and 22;
Address blocks 23 and 24 are provided in the land track 12a.
Is provided.

Since the radial position of the land track address block is different from the radial position of the groove track address block, crosstalk is less likely to occur when address information is reproduced.

Further, as a second conventional example, an open patent publication,
Hei 6-28729 describes an address setting method as shown in FIG.

In FIG. 5, for example, a groove track 43
a is provided with address blocks 51 and 52,
Address blocks 53 and 54 are provided in the land track 42a.
Is provided.

Since the radial position of the land block address block is different from the radial position of the groove track address block, crosstalk is less likely to occur when address information is reproduced.

[0011]

The first conventional example is effective in reducing crosstalk, but since the mirror area has a length of at least two address blocks, the eccentricity of the disk is reduced when the track pitch is reduced. And the tracking servo becomes unstable in the mirror area.

In the second conventional example, for example, when reproducing the address block 53, a part of the light spot is applied to the recording mark 511 of the adjacent groove track 43a or the recording mark 512 of the groove track 43b, and the amount of reflected light is reduced. However, there is a problem in that a part of the data is leaked and becomes noise, and the reading of the address block becomes worse.

Further, neither the first nor the second conventional example describes a method of recording on an optical disk having addresses arranged as described above.

The present invention has been made in consideration of the above problems, and has been devised to improve the arrangement of address pits in a sector address portion, thereby reducing reading errors of address signals on a land / groove recording disk. It is an object of the present invention to provide an optical disk device that performs recording and reproduction on an optical disk.

[0015]

In order to achieve this object, an optical disk according to the present invention comprises a plurality of sectors each having an address area and a data area formed by a groove-shaped track (groove track) and a track (land) between the grooves. Track), the address area has a plurality of address blocks each composed of a plurality of uneven pit rows, and the address blocks are adjacent in the radial direction between adjacent groove tracks and land tracks. In a track radially adjacent to a track having an address area, a section radially adjacent to an address block in the address area is a mirror area having neither a groove track nor a pit, In the address area, address blocks and mirror areas are arranged alternately in the circumferential direction. It is.

Further, the optical disk of the present invention is an optical disk provided with a plurality of sectors having an address area and a data area on both a groove-shaped track (groove track) and a track (land track) between the grooves. The area has an address block composed of a plurality of uneven pit rows, and a groove track (land track)
Is arranged so that the end position of the address area of the above and the start position of the address area of the adjacent land track (groove track) are radially adjacent to each other, and the section adjacent to the address area in the radial direction is recorded. There is no area.

In the optical disk of the present invention, the address block includes a pattern for determining whether the data area following the address area including the address block is a land track or a groove track.

Further, the optical disk apparatus of the present invention is an optical disk in which a plurality of sectors having an address area and a data area are provided on both groove-shaped tracks (groove tracks) and tracks between the grooves (land tracks). In the address area, there are a plurality of address blocks each composed of a row of pits having irregularities. Between adjacent groove tracks and land tracks, the address blocks are recorded on an optical disk arranged so as not to be adjacent in the radial direction. In an optical disc device to perform, the time from the detection of an address to the start of recording differs depending on the polarity of a track.

Further, the optical disc device of the present invention does not record data at a position adjacent to the address area in the track adjacent to the track having the address area in the radial direction.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disc according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 7 is an external view of the optical disc of the first embodiment according to the present invention.

The optical disk 71 has a groove-shaped track 73.
(Groove tracks) and tracks (land tracks) 72 between the grooves are provided. Recording and / or reproduction of information is performed on both tracks, and one track is divided into one or more address areas 75 and data areas 76.

When one track is divided into a plurality of sectors, an address area 75 and a data area 76 are assigned to each sector. In this case, each address area 75 is also called a sector address area.

Incidentally, as for the track configuration, as shown in FIG. 10, a disk in which land tracks and groove tracks are connected in a continuous spiral form for each turn may be used.

The optical disk 71 has a substrate and various films (not shown) formed on the substrate. These films include a recording film for recording information, a reflective film, a protective film, and the like. Further, the optical disk 71 may be an optical disk of a type in which two substrates each having an information recording surface are bonded.

Next, reference is made to FIG. FIG.
1 shows the address area 75 in more detail.
The illustrated groove tracks 73a, 73b, 73
A land sector address area 7501 and a groove sector address area 7502 indicating the address of each sector are respectively assigned to c and the land tracks 72a and 72b.

For example, in order to indicate the address of the groove track 73a, in the address area 7501, two address blocks 81 and 82 composed of a plurality of pit strings are provided.
Is provided. The land track 72a is provided with two address blocks 83 and 84 composed of a plurality of pit rows. Note that the content of information indicated by the pit pattern (pit string) of the address block differs for each sector.

In FIG. 8, in the groove track 73a, behind the address blocks 81 and 82 (813 is a light spot, and it is assumed that the light spot travels from left to right.
The traveling direction of the light spot is used as a reference. The non-recording area 81 corresponding to the sum of the lengths of the address blocks 81 and 82 or equal to or greater than the sum of the lengths of the address blocks 81 and 82
There are two. The non-recording area 812 is the same in appearance as the data area of the groove track 73a, and no recording is performed.

Similarly, in the land track 72a, the address blocks 83, 8 are located ahead of the address blocks 83, 84.
4 or the address block 8
A non-recording area 811 equal to or greater than the sum of the lengths of 3, 84 exists. The non-recording area 811 has the same appearance as the non-pitted portion of the pit row forming the address block, and no recording is performed.

In this embodiment, there are two address blocks in the sector address area of each sector, but there may be three or more address blocks. FIG. 4 shows an example of the layout of the address blocks when there are three address blocks.

In FIG. 4, the VFO region is a single frequency pattern region for providing synchronization to the PLL. AM
The (address mark) area is an area that indicates an address position by a pattern that does not exist in the data part. In the LG area, whether the sector following the address is a land sector,
This is an area indicating whether the sector is a groove sector. The PID area is an area indicating a sector address and the order of address blocks in the sector address area. The IED area is an area for error detection.

Although address blocks are shown in succession in FIG. 4, a mirror area sufficiently shorter than the address blocks may be provided between each address block.

Next, in the optical disk in which the address blocks are arranged as described above, for example, the light spot 813 follows the groove track 73b, and
The case of passing through the 3b groove sector address area 7501 will be described.

FIG. 9 shows the configuration of an optical disk apparatus for reading signals on an optical disk. In FIG. 9, 71 is an optical disk, 91 is a disk motor, 92 is an optical block, 9
3 is a preamplifier, 94 is an equalizer, 95 is a binarization circuit, 96 is a PLL, 97 is a demodulation circuit, 98 is a switching circuit, 99 is an address mark detection circuit, 910 is an error correction circuit, 911 is a CRC determination circuit, and 912 is Data signal,
913 is an address signal.

When the light spot 813 follows the track (for example, the groove track 73b), the address area 75
In the address blocks 75 and 76 of No. 01, the amount of reflected light decreases due to light interference in a portion having a pit, and the output of the light receiving portion decreases. In the portion without a pit, the amount of reflected light increases. Get higher.

The total amount of light output from the light receiving section corresponding to the address pit is input to the preamplifier 93, and the equalizer 94
, And is binarized by a binarization circuit 95 from a predetermined slice level, and is converted into a signal sequence of 0 and 1.

The clock is converted from the binary signal to the PLL 96
And a signal 914 synchronized with the clock is output. The signal 914 is demodulated by the demodulation circuit 97 and converted into a data format that can be processed externally. If the demodulated data is a signal in the data area, the error of the data is corrected by the error correction circuit 910 to become a data signal 912.

On the other hand, the signal 914 is input to the AM detection circuit 99, and when an AM signal for identifying an address portion is detected from a signal train constantly output from the PLL 96, the switching circuit 98 is turned on. The demodulated data is processed as a signal in the address area,
At 11 it is determined whether or not there is an error, and if there is no error, it is output as an address signal 913.

With the above arrangement of the address blocks,
When reading the address signal from the change in the amount of reflected light due to the unevenness of the pit row of each of the address blocks 75 and 76, since the adjacent tracks 72a and 72b are non-recording areas, the amount of reflected light from the adjacent track in the form of an AC signal is used. There is no leakage and there is no effect on address reading. Therefore, good address reading can be performed without being affected by crosstalk from an adjacent track.

Similarly, due to the above arrangement of the address blocks, when reading the address signal from the change in the amount of reflected light due to the unevenness of the pit rows of the address blocks 83 and 84, for example, the adjacent tracks 73a and 73b are in the non-recording area. For this reason, there is no leakage of the reflected light amount from the adjacent track in the form of an AC signal, and the reading of the address is not affected. Therefore, good address reading can be performed without being affected by crosstalk from an adjacent track.

Further, by arranging the start position of the address area of the land track and the end position of the address area of the groove track in the radial direction as in this embodiment, the CAV format and the ZCLV (ZCAV) format can be used. A disk can be realized.

Next, recording of data in the optical disk device shown in FIG. 9 will be described. Track polarity detection circuit 91
8 fetches a signal 914, triggered by the output signal of the address mark detection circuit 99, and outputs L in the address block.
From the G area, whether the sector to be recorded is a land sector
A CRC discriminating circuit 91 detects whether the sector is a groove sector or not.
A signal 919 corresponding to the track polarity is output when the output signal of 1 is obtained, that is, when the time when the address is normally detected is used as a trigger.

The recording start position setting circuit 917 controls the time from the detection of an address to the start of recording by the signal 919 output from the track polarity detection circuit 918 according to the track polarity.
In the case where recording is performed on the non-recording area 812, the recording start time after the address is detected is delayed by the passing time of the non-recording area 812.

The laser driving circuit 915 switches the laser power from the reproducing power to the recording power in accordance with the output signal of the recording start position setting circuit 917, and records desired data. As described above, by including the track polarity detection circuit 918 and the recording start position setting circuit 917, the recording start position in the data area can be correctly controlled regardless of whether recording is performed in either the land sector or the groove sector.

With the above configuration, for example, when recording is performed on the groove track 73a, the non-recording area 812
In order to prevent data from being recorded on a track adjacent to a track having a sector address area, data is not recorded at a position radially adjacent to the sector address area. There is no leakage of reflected light, and address reading reliability can be ensured.

In the present embodiment, the LG area of the address block is used as a method of detecting the track polarity. However, any method can be used to detect whether the sector to be recorded is a land sector or a groove sector. For example, another method may be used, such as making a determination in the order of detecting the address block and the non-recording area.

When the determination is made in the order of detecting the address block and the mirror area, for example, when the detection is performed in the order of the non-recording area and the address block, it is determined that the area is the land track.
When an address block and a non-recording area are detected in this order, it is determined that the track is a groove track. Hereinafter, optical disks according to different embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an external view of an optical disk according to a second embodiment of the present invention. The optical disk 11 is provided with groove-shaped tracks 13 (groove tracks) and tracks (land tracks) 12 between the grooves.

Recording and / or reproduction of information is performed on both tracks, and one track is divided into one or more address areas 15 and data areas 16.
If one track is divided into multiple sectors,
An address area 15 and a data area 16 are assigned to each sector. In this case, each address area 15
Also called a sector address area.

Incidentally, as for the track configuration, a disk in which land tracks and groove tracks are connected in a continuous spiral as shown in FIG. 10 may be used.

The optical disk 11 has a substrate and various films (not shown) formed on the substrate. These films include a recording film for recording information, a reflective film, a protective film, and the like. The optical disk 11 may be an optical disk of a type in which two substrates each having an information recording surface are bonded.

Next, reference is made to FIG. FIG. 6 shows the optical disk 1
1 shows the address area 15 in more detail.
The illustrated groove tracks 13a, 13b, 13
c, and each of the land tracks 12a and 12b has a sector address area 15 indicating the address of each sector.
Is assigned.

For example, in order to indicate the address of the groove track 13a, two address blocks 21 and 2 composed of a plurality of pit strings are included in the sector address area 15.
2 are provided. The land track 12a is provided with two address blocks 23 and 24 composed of a plurality of pit rows. Note that the content of information indicated by the pit pattern (pit row) of the address block differs for each sector.

In FIG. 6, for example, groove track 1
3a, the address blocks are located between the address blocks 21 and 22 and behind the address block 22 (613 denotes a light spot, which is assumed to travel from left to right with reference to the traveling direction of the light spot). There are mirror areas 62, 64 that are equal to or longer than the length. The mirror areas 62 and 64 are the same in appearance as the non-pit portions of the pit row constituting the address block, and are included in the sector address area 15 and are not recorded.

Similarly, in the land track 12a, between the address blocks 23 and 24 and the address block 23
There are mirror areas 63 and 61 corresponding to or longer than the length of the address block in front of.

In this embodiment, the groove tracks are arranged in the order of an address block, a mirror area, an address block, and a mirror area, and the land tracks are arranged in the order of a mirror area, an address block, a mirror area, and an address block. However, the arrangement order of the address block and the mirror area may be switched between the groove track and the land track.

In this embodiment, there are two address blocks in the sector address area of each sector. However, three or more address blocks may be provided.

FIG. 4 shows an example of the layout of the address blocks when there are three address blocks.

In FIG. 4, the VFO area is a single frequency pattern area for providing synchronization to the PLL. AM
The (address mark) area is an area that indicates an address position by a pattern that does not exist in the data part. In the LG area, whether the sector following the address is a land sector,
This is an area indicating whether the sector is a groove sector. The PID area is an area indicating a sector address and the order of address blocks in the sector address area. The IED area is an area for error detection.

Although address blocks are shown in succession in FIG. 4, a mirror area exists between each address block.

Next, in the optical disk in which the address blocks are arranged as described above, for example, the light spot 613 follows the groove track 13b,
The case of passing through the 3b sector address area 15 will be described.

FIG. 3 shows the configuration of an optical disk apparatus for reading signals on an optical disk. In FIG. 3, 11 is an optical disk, 31 is a disk motor, 32 is an optical block,
3 is a preamplifier, 34 is an equalizer, 35 is a binarization circuit, 36 is a PLL, 37 is a demodulation circuit, 38 is a switching circuit, 39 is an address mark detection circuit, 310 is an error correction circuit, 311 is a CRC determination circuit, 312 is a CRC determination circuit. Data signal,
313 is an address signal.

When the light spot 613 follows the track (for example, the groove track 13b), in the address blocks 25 and 26 of the sector address area 15, the light interferes with the pits in the pitted portions, so that the amount of reflected light decreases and the light receiving portion The output decreases, and the amount of reflected light increases in portions without pits, so that the output of the light receiving unit increases.

The total amount of light output from the light receiving section corresponding to the address pit is input to the preamplifier 33, and the equalizer 34
, And is binarized by a binarization circuit 35 from a predetermined slice level, and is converted into a signal sequence of 0 and 1.

The clock is converted from the binary signal to the PLL 36.
And a signal 314 synchronized with the clock is output. The signal 314 is demodulated by the demodulation circuit 37 and converted into a data format that can be processed externally. If the demodulated data is a signal in the data area, an error of the data is corrected by the error correction circuit 310 to become a data signal 312.

On the other hand, the signal 314 is input to the AM detection circuit 39, and when an AM signal for identifying an address portion is detected from a signal sequence constantly output from the PLL 36, the switching circuit 38 The demodulated data is switched as a signal in the address area, and the CRC judgment circuit 3
At 11 it is determined whether or not there is an error, and if there is no error, it is output as an address signal 313.

With the above arrangement of address blocks,
When the address signal is read from the change in the amount of reflected light due to the unevenness of the pit row of each of the address blocks 25 and 26, since the adjacent tracks 12a and 12b are mirror areas, the amount of reflected light from the adjacent track in the form of an AC signal is also reduced. There is no interruption, and the reading of the address is not affected. Therefore, good address reading can be performed without being affected by crosstalk from an adjacent track.

Further, by alternately arranging the address blocks and the mirror areas as in the present embodiment, even if the track pitch becomes narrow, the length of the mirror area is short, so that it is hardly affected by the eccentricity of the disk, and the sector address is not changed. The tracking servo in the area becomes stable.

Next, data recording in the optical disk device shown in FIG. 3 will be described. The track detection circuit 318 takes in the signal 314 by using the output signal of the address mark detection circuit 39 as a trigger, and outputs the LG signal in the address block.
From the area, it is detected whether the sector to be recorded is a land sector or a groove sector, and a CRC determination circuit 311
Is output, that is, the time when the address is normally detected is used as a trigger to output a signal 319 corresponding to the track polarity.

The recording start position setting circuit 317 controls the time from the detection of an address to the start of recording by the signal 319 output from the track polarity detection circuit 318 according to the track polarity.
When recording is performed on the land track 12a, the recording start time is delayed by the passage time of the mirror area 164, as compared with the case where recording is performed on the land track 12a.

The laser drive circuit 315 switches the laser power from the reproduction power to the recording power according to the output signal of the recording start position setting circuit 317, and records desired data. As described above, by including the track polarity detection circuit 318 and the recording start position setting circuit 317, the recording start position in the data area can be correctly controlled regardless of whether recording is performed in either the land sector or the groove sector.

In the present embodiment, the LG area of the address block is used as a method of detecting the track polarity. However, any method can be used to detect whether the sector to be recorded is a land sector or a groove sector. Other methods may be used, such as making a determination in the order of detecting the address block and the mirror area.

When determining in the order of detecting the address block and the mirror area, for example, from the beginning of the sector address area, when detecting the mirror area, the address block, and the mirror area in this order, it is determined that the track is a land track, and the address block, When a mirror area and an address block are detected in this order, it is determined to be a groove track.

[0073]

According to the arrangement of the address blocks of the optical disk of the first embodiment of the present invention, when reading an address, data is not recorded at a position radially adjacent to the address. There is no leakage of reflected light from the recording mark at the time of reading, and address reading reliability can be ensured.

The arrangement of the address blocks on the optical disk according to the second embodiment of the present invention allows the influence of crosstalk from the address blocks of adjacent tracks when reading an address and reduces the track pitch. However, the tracking servo in the mirror area can be stabilized.

The polarity of the sector to be recorded next can be determined by the arrangement of the address blocks on the optical disc according to the first and second embodiments of the present invention.

Further, according to the optical disk devices of the first and second embodiments of the present invention, the recording start position in the data area can be correctly controlled regardless of whether the recording is performed in the land sector or the groove sector.

[Brief description of the drawings]

FIG. 1 is an external view of an optical disc according to a second embodiment of the present invention.

FIG. 2 is a configuration diagram of an address area of a conventional optical disc.

FIG. 3 is a configuration diagram of an optical disc device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a layout of an address block according to the first embodiment of the present invention;

FIG. 5 is a configuration diagram of an address area of a conventional optical disk.

FIG. 6 is a configuration diagram of an address area according to a second embodiment of the present invention;

FIG. 7 is an external view of an optical disc according to the first embodiment of the present invention.

FIG. 8 is a configuration diagram of an address area of the optical disc in the first embodiment of the present invention.

FIG. 9 is a configuration diagram of an optical disc device according to the first embodiment of the present invention.

FIG. 10 is a diagram showing a track configuration of an optical disc in the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Optical disk 12 Land track 13 Groove track 15 Address area 16 Data area 21 Address block 212 Mirror area 213 Light spot 39 Address mark detection circuit 311 CRC discrimination circuit 318 Track polarity detection circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunji Ohara 1006 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] An optical disk provided with a plurality of sectors having an address area and a data area on both a groove-shaped track (groove track) and a track (land track) between grooves, wherein a plurality of sectors are provided in the address area. It has an address block composed of an uneven pit row, and between adjacent groove tracks and land tracks, the address blocks are arranged so as not to be adjacent in the radial direction. In the adjacent track, a section radially adjacent to the address block in the address area is a mirror area having no groove track and no pit, and in the address area, the address block and the mirror area are alternately arranged in the circumferential direction. An optical disk characterized in that the optical disk is made. 2. An optical disk having a plurality of sectors each having an address area and a data area on both a groove-shaped track (groove track) and a track (land track) between grooves, wherein a plurality of sectors are provided in the address area. It has an address block composed of an uneven pit row, and the end position of the address area of a groove track (land track) and the start position of the address area of an adjacent land track (groove track) are adjacent in the radial direction. An optical disc, wherein a section adjacent to the address area in a radial direction is a non-recorded area. 3. The address block includes a pattern for determining whether a data area following an address area including the address block is a land track or a groove track. Item 1
Or the optical disk of 2. 4. An optical disk provided with a plurality of sectors having an address area and a data area on both a groove-shaped track (groove track) and a track (land track) between grooves, wherein the address area has a plurality of sectors. In an optical disc apparatus having an address block composed of an uneven pit row and performing recording on an optical disc arranged so as not to be adjacent in the radial direction between adjacent groove tracks and land tracks, An optical disc device characterized in that the time from the detection of an address to the start of recording differs depending on the polarity of the optical disk. 5. The optical disk apparatus according to claim 4, wherein data is not recorded in a position adjacent to the address area in a track adjacent to the track having the address area in a radial direction.