JPH11213392A - Optical disk and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the precision in identifying the lands and the grooves of a track by reproducing a header in which identification data are emboss- recorded, selecting the identification data with a priority and identifying the later sectors from the relationship between the sizes of first and third header fields. SOLUTION: Let n+3N, n+3N, n+2N and n+2N be the header numbers of header fields 1 to 4 between a group sector and another group sector. Similarly, let n+N, n+N, n+2N and n+2N be the header field numbers between a land sector and another land sector. Then, the sector numbers of a header 1 field and a header 3 field are compared. If the former is larger, the next sector is identified as a groove track. If the former is smaller, it is identified as a land track. Similarly, in the changes of a groove to a land or a land to a groove sector, the sector numbers of header fields are compared and a next track is identified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a DVD (Digital Video Disk) -RAM (rand) for recording predetermined information.
Optical discs such as om access memory). In addition, the present invention relates to an optical disk device that reproduces data recorded on an optical disk and records data on the optical disk.

[0002]

2. Description of the Related Art Generally, a groove track is formed on an optical disk by a spiral groove. A track corresponding to a position between groove tracks is called a land track. Some optical discs can record data on only one of a land track and a groove track, and others can record data on both a land track and a groove track.

In the latter case, identification of land tracks and groove tracks is required at the time of data recording and reproduction. This is because tracking and focusing according to land tracks and groove tracks are required.

Conventionally, land tracks and groove tracks have been identified from the detection state of reflected light of a light beam applied to an optical disk.

[0005]

In the case of the above-described identification, the corn is easily affected by scratches on the optical disk, meandering of the beam, and the like, and there is a problem in identification accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disk device capable of improving the accuracy of identifying a land track and a groove track.

Another object of the present invention is to provide an optical disc which can contribute to the achievement of the object of improving the accuracy of discriminating land tracks and groove tracks.

[0008]

In order to solve the above-mentioned problems and achieve the object, an optical disk and an optical disk apparatus according to the present invention are configured as follows.

The optical disk of the present invention is a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, a second, and a third groove which are sequentially adjacent in the radial direction. Tracks (G12, G32,
G52) including a plurality of groove tracks (G10, G3
0, G50, G70, G11, G31, G51, G7
1, G12, G32, G52, G72, G1n, G3
n, G5n, G7n) and a first land track formed at a position between the grooves adjacent to each other in the radial direction and between the first and second groove tracks. (L22) and a plurality of land tracks (L2) including a second land track (L42) formed at a position between the second and third groove tracks.
0, L40, L60, L21, L41, L61, L2
2, L42, L62, L2n, L4n, L6n), the first, second, and third groove tracks, and a header area including an area where one end of the first and second land tracks is in contact. ) And the first identification data (sector number of PID1 or PID2) which is arranged in the header area on the boundary extension line of the first land track and the second groove track. First header part (H32-1)
Or H32-2) and second identification data different from the first identification data, the second identification data being arranged in the header area on a boundary extension line of the second groove track and the second land track. And a second header section (H42-3 or H42-4) on which the (PID3 or PID4 sector number) is emboss-recorded.

[0010] The optical disk of the present invention is a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, a second, and a third groove which are sequentially adjacent in the radial direction. Tracks (G12, G32,
G52) including a plurality of groove tracks (G10, G3
0, G50, G70, G11, G31, G51, G7
1, G12, G32, G52, G72, G1n, G3
n, G5n, G7n) and a first land track formed at a position between the grooves adjacent to each other in the radial direction and between the first and second groove tracks. (L22) and a plurality of land tracks (L2) including a second land track (L42) formed at a position between the second and third groove tracks.
0, L40, L60, L21, L41, L61, L2
2, L42, L62, L2n, L4n, L6n), the first, second, and third groove tracks, and a header area including an area where one end of the first and second land tracks is in contact. ) And the first identification data (sector number of PID1 or PID2) which is arranged in the header area on the boundary extension line of the first land track and the second groove track. First header part (H32-1)
Or H32-2) and a value smaller than a value indicated by the first identification data, which is arranged in the header area on a boundary extension line of the second groove track and the second land track. A second header section (H42-3 or H42-4) on which second identification data (PID3 or PID4 sector number) is embossed, and a boundary extension between the second land track and the third groove track. A third header portion which is arranged in the header area on a line and in which third identification data (sector number of PID1 or PID2) having a value smaller than the value indicated by the second identification data is emboss-recorded; (H52-
1 or H52-2).

According to the present invention, in an optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, an irradiating means (35, 39) for irradiating the optical disk with a light beam; Detecting means (44) for detecting reflected light of the light beam irradiated and reflected on the optical disk, and reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means (3
8) and predetermined identification data (PID1, PID2, PID3,
An identification means (114) for identifying a land track and a groove track from the PID4 sector number) is provided.

According to the present invention, in an optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, an irradiating means (35, 39) for irradiating the optical disk with a light beam; Detecting means (44) for detecting reflected light of the light beam irradiated and reflected on the optical disk, and reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means (3
8) and a plurality of identification data (PID1, PID2, PID3,
Priority selecting means for preferentially selecting predetermined identification data (sector numbers of PID2 and PID4) from among the sector numbers of PID4) and (112, SEL1, S
EL2), and identification means (114) for identifying land tracks and groove tracks from the predetermined identification data preferentially selected by the priority selection means.

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, a second, and a third track which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which first identification data is emboss-recorded, and the header region on a boundary extension line of the second groove track and the second land track,
An optical disc device for reproducing data recorded on an optical disc having a second header portion on which second identification data different from the first identification data is emboss-recorded,
Irradiating means (35, 39) for irradiating the optical disk with a light beam; detecting means (44) for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disk; A reproducing means (38) for reproducing data recorded on the optical disc reflected on the reflected light detected by the first and second identification data included in the data reproduced by the reproducing means; Identification means (114) for identifying land tracks and groove tracks.

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, second, and third tracks which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion (H32-1 or H32-2) on which substantially identical first and second identification data (sector numbers of PID1 and PID2) are embossed, and the second groove track and The third and fourth identification data (PID3 and PID3) which are arranged in the header area on a boundary extension line of the second land track and are substantially the same.
In the optical disc apparatus for reproducing data recorded on an optical disc provided with a second header portion (H42-3 or H42-4) on which an embossed recording (sector number 4) is recorded, the optical disc is irradiated with a light beam. Irradiating means (35, 39), detecting means (44) for detecting reflected light of the light beam emitted from the irradiating means and reflected on the optical disk, and reflecting the reflected light detected by the detecting means A reproducing means (38) for reproducing the data recorded on the optical disc read out, and the second and fourth identification data (sector numbers of PID2 and PID4) are preferentially determined from the data reproduced by the reproducing means. Priority selection means to be selected and (112, SEL1, SE
L2), an identification means (114) for identifying a land track and a groove track from the second and fourth identification data preferentially selected by the priority selection means.

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, second, and third tracks which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which first identification data is emboss-recorded, and the header region on a boundary extension line of the second groove track and the second land track,
A second header portion on which second identification data having a value smaller than the value indicated by the first identification data is embossed, and the header on a boundary extension line between the second land track and the third groove track. And reproducing data recorded on an optical disk having a third header portion in which the third identification data having a value smaller than the value indicated by the second identification data is emboss-recorded. Irradiating means (35, 39) for irradiating the optical disk with a light beam, and detecting means (44) for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disk. Reproducing means (38) for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and The first included in the generated data, from the second, and third identification data, and a identification means for identifying the land track and a groove track (114).

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, second, and third tracks which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion (H32-1 or H32-2) on which substantially identical first and second identification data (sector numbers of PID1 and PID2) are embossed, and the second groove track and Wherein the first land track is arranged in the header area on a boundary extension line of the second land track, and
And a second header portion (H42-3) in which the third and fourth identification data (sector numbers of PID3 and PID4) having a value smaller than the value indicated by the second identification data and substantially the same are emboss-recorded. Or H42-4), which is arranged in the header area on the boundary extension line of the second land track and the third groove track, and is greater than the value indicated by the third and fourth identification data. The third header portion (H52-1 or H52) in which the fifth and sixth identification data (sector numbers of PID3 and PID4) having a small value and substantially the same are emboss-recorded.
-2) in an optical disc apparatus for reproducing data recorded on the optical disc, the irradiation means (35, 39) for irradiating the optical disc with a light beam; Detecting means (44) for detecting the reflected light of the light beam, and reproducing means (3) for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means.
8) and from the data reproduced by the reproducing means, the second and fourth identification data (sector numbers of PID2 and PID4) or the fourth and sixth identification data (sector numbers of PID4 and PID2) Priority selection means (112, SEL1, SEL
2) and identification means (114) for identifying a land track and a groove track from the second and fourth identification data or the fourth and sixth identification data preferentially selected by the priority selection means. And

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, second, and third tracks which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which first identification data is emboss-recorded, and the header region on a boundary extension line of the second groove track and the second land track,
A second header portion on which second identification data having a value smaller than the value indicated by the first identification data is embossed, and the header on a boundary extension line between the second land track and the third groove track. And reproducing data recorded on an optical disk having a third header portion in which the third identification data having a value smaller than the value indicated by the second identification data is emboss-recorded. An irradiating means for irradiating the optical disc with a light beam; a detecting means for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disc; Reproducing means for reproducing data recorded on the optical disk reflected on the reflected light, and the data contained in the data reproduced by the reproducing means. The values indicated by the first, second, and third identification data are compared, and when the value indicated by the second identification data is smaller than the value indicated by the first identification data, the second groove track is set to a groove. Identification means for identifying the track as a track, and identifying the second land track as a land track when the value indicated by the third identification data is smaller than the value indicated by the second identification data.

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, second, and third tracks which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion in which substantially identical first and second identification data are emboss-recorded, the second groove track, and the second header portion.
A third track and a fourth track which are smaller than the values indicated by the first and second identification data and are substantially the same. A second header portion on which data is emboss-recorded, and the header region on a boundary extension line between the second land track and the third groove track, wherein the third and fourth Fifth and sixth values that are smaller than the value indicated by the identification data and are substantially the same
An optical disk device for reproducing data recorded on an optical disk provided with a third header portion on which the identification data of the above is emboss-recorded, and irradiating means for irradiating the optical disk with a light beam; Detecting means for detecting reflected light of the light beam reflected on the optical disk; reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and reproducing means Priority selecting means for preferentially selecting the second and fourth identification data or the fourth and sixth identification data from the data reproduced by The values indicated by the second and fourth identification data or the fourth and sixth identification data are compared, respectively, and the value indicated by the second identification data is compared with the value indicated by the second identification data. When the value indicated by the identification data is smaller, the second groove track is identified as a groove track. When the value indicated by the sixth identification data is smaller than the value indicated by the fourth identification data, the second groove track is identified. Identification means for identifying a land track as a land track.

According to the present invention, in an optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, an irradiating means (35, 39) for irradiating the optical disk with a light beam; Detecting means (44) for detecting reflected light of the light beam irradiated and reflected on the optical disk, and reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means (3
8) and predetermined identification data (PID1, PID2, PID3,
First identification means (11) for identifying a land track and a groove track from the PID4 sector number).
4) and a second identification means for identifying a land track and a groove track according to the detection state of the reflected light detected by the detection means.

According to the present invention, in an optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, an irradiating means (35, 39) for irradiating the optical disk with a light beam; Detecting means (44) for detecting reflected light of the light beam irradiated and reflected on the optical disk, and reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means (3
8) and a plurality of identification data (PID1, PID2, PID3,
Priority selecting means for preferentially selecting predetermined identification data (sector numbers of PID2 and PID4) from among the sector numbers of PID4) and (112, SEL1, S
EL2), first identification means (114) for identifying a land track and a groove track from the predetermined identification data preferentially selected by the priority selection means, and the reflected light detected by the detection means. A second identification unit that identifies a land track and a groove track according to a detection state.

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, a second and a third track which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which first identification data is emboss-recorded, and the header region on a boundary extension line of the second groove track and the second land track,
A second header portion on which second identification data having a value smaller than the value indicated by the first identification data is embossed, and the header on a boundary extension line between the second land track and the third groove track. And reproducing data recorded on an optical disk having a third header portion in which the third identification data having a value smaller than the value indicated by the second identification data is emboss-recorded. An irradiating means for irradiating the optical disc with a light beam; a detecting means for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disc; Reproducing means for reproducing data recorded on the optical disk reflected on the reflected light, and the data contained in the data reproduced by the reproducing means. The values indicated by the first, second, and third identification data are compared, and when the value indicated by the second identification data is smaller than the value indicated by the first identification data, the second groove track is set to a groove. A first identification unit for identifying the second land track as a land track when the value identified by the third identification data is smaller than a value indicated by the second identification data; And a second identification means for identifying a land track and a groove track in accordance with the state of detection of the reflected light detected by the method.

According to the present invention, there is provided a track formed by a plurality of grooves arranged in a discontinuous spiral shape, each of which has a first, second and third tracks which are sequentially adjacent in the radial direction.
A plurality of groove tracks, including the groove track of
A first land track formed at a position between the first and second groove tracks, the track corresponding to a position between radially adjacent grooves, and the second and third tracks formed at positions between the first and second groove tracks. A plurality of land tracks including a second land track formed at a position between the groove tracks of the first, second, and third groove tracks;
And a header area including an area where one ends of the first and second land tracks are in contact with each other, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion in which substantially identical first and second identification data are emboss-recorded, the second groove track, and the second header portion.
A third track and a fourth track which are smaller than the values indicated by the first and second identification data and are substantially the same. A second header portion on which data is emboss-recorded, and the header region on a boundary extension line between the second land track and the third groove track, wherein the third and fourth Fifth and sixth values that are smaller than the value indicated by the identification data and are substantially the same
An optical disk device for reproducing data recorded on an optical disk provided with a third header portion on which the identification data of the above is emboss-recorded, and irradiating means for irradiating the optical disk with a light beam; Detecting means for detecting reflected light of the light beam reflected on the optical disk; reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and reproducing means Priority selecting means for preferentially selecting the second and fourth identification data or the fourth and sixth identification data from the data reproduced by The values indicated by the second and fourth identification data or the fourth and sixth identification data are compared, respectively, and the value indicated by the second identification data is compared with the value indicated by the second identification data. When the value indicated by the identification data is smaller, the second groove track is identified as a groove track. When the value indicated by the sixth identification data is smaller than the value indicated by the fourth identification data, the second groove track is identified. A first identification unit that identifies a land track as a land track; and a second identification unit that identifies a land track and a groove track according to a detection state of the reflected light detected by the detection unit. .

[0023]

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

First, referring to FIGS. 1 to 9, a DVD (Digital Video Disk) -RAM (rand) as an optical disk will be described.
The outline of om access memory) will be described. FIG. 1 is a diagram for explaining the concept of a zone in a data recording area of an optical disc. FIG. 2 is a diagram for explaining an outline of a data structure of a data recording area of the optical disc. FIG.
FIG. 3 is a diagram for explaining a rotation speed corresponding to each zone of the optical disc and the number of sectors per track in each zone. FIG. 4 is a diagram for explaining the sector format of the optical disc. FIGS. 5 and 6 are diagrams for explaining a header field provided between a groove sector and a land sector or a land sector. 7 and 8 are diagrams for explaining a header field provided between a groove sector and a land sector. FIG. 9 is a perspective view showing the structure of the optical disc.

As shown in FIG. 1 and FIG.
Can be divided into a lead-in area 2, a data area 3, and a lead-out area 4. Each area is composed of a plurality of zones, and each zone is composed of a plurality of tracks.

The lead-in area 2 includes an emboss data zone 5 and a rewritable data zone 6. A reference signal and control data are recorded in the emboss data zone 5 during manufacturing. The rewritable data zone 6 further includes a guard track zone, a disk test zone, a drive test zone, a disk identification data zone, a replacement management zone as a replacement management area, and the like. .

The data area 3 is composed of a plurality of zones, for example, zones 3a,.

The lead-out area 4 is a rewritable data zone similar to the rewritable data zone 6 formed in the lead-in area 2. In the lead-out area 4, data having the same recording content as the data zone 6 is recorded.

The optical disc 1 has a different number of sectors per track between the inner circumference and the outer circumference. That is, the number of sectors included in one track on the outer peripheral side is larger than the number of sectors included in one track on the inner peripheral side.
Therefore, as shown in FIG. 3, the number of rotations (rotational speed) of the optical disc 1 changes for each zone. Therefore, in each zone in the lead-in area 2, each zone in the data area 3, and each zone in the lead-out area 4, the rotation speed decreases from the inner circumference to the outer circumference of the optical disc 1.

The zones 3a,... 3x of the data area 3
As shown in FIG. 1 and FIG. 2, each track has an ECC (error correction code) block data unit (for example, 38688 bytes) as a data recording unit.
The data is recorded.

Next, the sector format will be described with reference to FIG.

As shown in FIG. 4, one sector is approximately 2 sectors.
It consists of 697 bytes. This sector contains 8-
Data modulated by 16 modulation is recorded. 8-1
Six modulation is a modulation method for modulating an 8-bit input code sequence into a 16-bit output code sequence. The input code sequence is called an input bit, and the output code sequence is called a channel bit. Incidentally, one byte has the same meaning as 16 channel bits.

Here, the details of one sector will be described. One sector has a 128-byte header field,
It consists of a byte mirror field and a 2567 byte recording field.

In the header field, predetermined data is emboss-recorded (pre-formatted) as an uneven shape in the optical disk manufacturing process. In this header field, quadruplicate sector addresses are written in order to improve the detection accuracy of the header. That is, this header field is composed of a header 1 field, a header 2 field, a header 3 field, and a header 4 field. The header 1 field and the header 3 field are composed of 46 bytes. The header 2 field and the header 4 field are composed of 18 bytes.

The header 1 field and the header 3 field are a 36-byte synchronization code VFO (Variable Frequency).
ency Oscillator) 1 field, 3-byte address mark AM (Address Mark) field, 4-byte address PID (Physical ID) 1 field, 2-byte error detection code IED (ID Error Detection Code) 1
Field, 1-byte postamble PA (Post Amb
les) 1 field.

The header 2 field and the header 4 field are an 8-byte synchronization code VFO2 field, a 3-byte address mark AM field, a 4-byte address PID2 field, and a 2-byte error detection code I
The ED2 field is composed of a 1-byte postamble PA2 field.

The PID field (PID1 field,
PID2 field, PID3 field, PI
D4 field), sector information and a sector number are recorded. This PID field will be described later in detail.

VFO field (VFO1 field,
The PLL (Phase Locked Loo) is stored in the VFO2 field.
A continuous repeating pattern (100010001000...) for performing the pull-in of p) is recorded. More specifically, the pattern recorded in the VFO field is for synchronizing the frequency for reproducing the information recorded in the PID field.

In the AM field, an address mark (A
M) is recorded, and this address mark has a role of detecting a block boundary when demodulating a fixed-length block code. Specifically, the address mark recorded in the AM field indicates the position of the address information recorded in the PID field. A special pattern (a pattern violating the run-length restriction) that does not appear elsewhere is used for the address mark recorded in the AM field.

IED field (IED1 field,
An error detection code for the PID field is recorded in the IED2 field, IED3 field, and IED4 field), and the presence or absence of an error in the PID field read by the error detection code is detected.

State information necessary for demodulation is recorded in the PA field, and also has a role of adjusting the polarity so that the header field ends with a space.

The mirror field is a mirror surface field, and this field is used for, for example, gain adjustment of a photodetector described later.

The recording field is a field mainly responsible for recording user data. The recording fields are a (10 + J / 16) byte gap field, a (20 + K) byte guard 1 field, a 35 byte VFO3 field, and a 3 byte PS.
(Pre-synchronous code) field, 2418-byte data field (user data field), 1-byte postamble PA3 field, (55-K)
Guard 2 field of bytes, and (25-J / 1
6) Consists of a byte buffer field. Incidentally, J takes an integer of 0 to 15 and K takes an integer of 0 to 7 and takes a random value. As a result, the start position of the data writing is randomly shifted. As a result, deterioration of the recording film due to overwriting can be reduced.

The gap field is a field in which nothing is recorded.

The guard 1 field is a discard data area for absorbing the deterioration of the beginning of the repeated overwriting peculiar to the phase change recording film.

Although the VFO3 field is also a field for PLL lock, it is also a field for inserting a synchronization code in the same pattern to synchronize byte boundaries.

The PS field is a field in which a synchronization code is recorded, and is provided for detecting a block boundary.

The data field includes a data ID, a data ID error correction code IED (Data ID Error Detection Code).
Code), synchronization code, ECC (Error Collection Code)
), EDC (Error Detection Code), 2048 bytes of user data, and the like.
The data ID is a sector ID 1 to ID 16 of 4 bytes (32 channel bits) of each sector. Data ID
The error correction code IED is a 2-byte (16-bit) error correction code for data ID.

The postamble PA3 field contains state information necessary for demodulation and is a field indicating the end of the last byte of the previous data field.

The guard 2 field is a field provided to prevent the end deterioration at the time of repetitive recording peculiar to the phase change recording medium from reaching the data field.

The buffer field is a field provided to absorb rotation fluctuations of the motor for rotating the optical disk 1 so that the data field does not overlap the next header field.

Subsequently, the PID fields (PID1, PID2, PID3, PID
ID4 field) will be specifically described. PID
The field is composed of a 1-byte (8-bit) sector information field and a 3-byte (24-bit) sector number field. In the sector number field, address data of the sector is recorded.

Further, this sector information includes a 2-bit reserved field and a 2-bit PID.
It is composed of a number field, a 3-bit sector type field, and a 1-bit layer number field.

Nothing is recorded in the reserved field.

The PID number field records a PID number. For example, the PID number field in the header 1 field is “00” indicating PID1, the PID number field in the header 2 field is “01” indicating PID2, and the PID number field in the header 3 field is PI.
"10" indicating D3, P in header 4 field
“11” indicating PID4 is recorded in the ID number field.

According to the present invention, the land track and the groove track are identified based on the relationship between the sector numbers recorded in the sector number fields in the header 1 field to the header 4 field.

In the sector type field, "00" indicating a read-only sector is set.
0, "001", "010", or "011" indicating a reserved sector (Reserved), a rewritable head sector (Rewrit) of a land or groove track.
"100" indicating that it is an able first sector), and "10" indicating that it is a rewritable last sector of a land or groove track.
1 ", the sector immediately before the rewritable last sector of the land or groove track (Rewritable before last
sector), and other rewritable sectors (Rewr) of land or groove track.
It records "111" indicating that it is an itable other sector).

"1" or "0" indicating layer 1 or 0 is recorded in the layer number field.

Next, a header field provided between a groove sector and a land sector, a land sector and a land sector, or a groove sector and a land sector will be described with reference to FIGS. 5 to 8 are views showing a part of the information recording area of the optical disc.

FIGS. 5 and 6 show a land sector L01, a groove sector G11, a land sector L21, a groove sector G31, a land sector L41, and a groove sector G5 from the outer circumference to the inner circumference of the optical disk.
1 is provided. Further, the distance between the centers of adjacent tracks is referred to as a track pitch. For example, from the center of the track where the land sector L22 is provided, the groove sector G32
Is the track pitch. Note that N in FIG. 6 indicates one track (1
Per sector), and the value of N is 17 to 40
Is an integer between.

In FIGS. 7 and 8, a groove sector G1n, a land sector L2n, a groove sector G3n, a land sector L4n, and a groove sector G5n are provided from the outer circumference to the inner circumference of the optical disk. The situation is shown. Further, the distance between the centers of adjacent tracks is referred to as a track pitch. For example, the distance from the center of the track provided with the land sector L40 to the center of the track provided with the groove sector G50 is the track pitch. In addition,
N in FIG. 8 indicates the number of sectors per track (one round), and the value of N is an integer between 17 and 40.

First, with reference to FIGS. 5 and 6, a description will be given of a header field provided between a groove sector and a land sector or a land sector.

The header field 11 is provided with a plurality of pits P as shown in FIG. The centers of the pits constituting the header 1 field H12-1 and the 2 field H12-2 are the land sector L02 and the groove sector G12 (or the land sector L01 and the groove sector G12).
It exists at a position on the same line as the tangent of 11). Header 3 field H22-3 and header 4 field H22-4
Is located on an extension of a tangent line between the groove sector G12 and the land sector L22 (or the groove sector G11 and the land sector L21). Header 1
Field H32-1 and header 2 field H32-
The center of the pits constituting the second sector 2 exists on an extension of a tangent line between the land sector L22 and the groove sector G32 (or the land sector L21 and the groove sector G31). Header 3 field H42-3 and header 4 field H42
The center of the pits constituting -4 is the groove sector G32
And the land sector L42 (or the groove sector G31 and the land sector L41). Header 1 field H52-1 and header 2 field H5
The center of the pit constituting 2-2 is the land sector L42.
And the groove sector G52 (or the land sector L41 and the groove sector G51). Header 3 field H62-3 and header 4 field H
The center of the pit constituting 62-4 is located in the groove sector G.
52 and land sector L62 (or groove sector G51).
And the land sector L61).

The sector number of each header of the header field 11 provided between the groove sectors has a relationship as shown in FIG. For example,
A description will be given taking a sector number of a header field provided between the groove sector G11 and the groove sector G12 as an example. Groove sector G11 and groove sector G1
2, header 1 field H12-1, header 2
Field H12-2, header 3 field H22-
3 and a header 4 field H22-4. The sector number of the header 1 field H12-1 is (n + 3N), the sector number of the header 2 field H12-2 is (n + 3N), and the header 3 field H
The sector number of 22-3 is (n + 2N), and the sector number of header 4 field H22-4 is (n + 2N). In other words, comparing the sector numbers of each header provided between the groove sector and the groove sector,
The relationship of (sector number of header 1 field or header 2 field)> (sector number of header 3 field or header 4 field) is established.

On the other hand, the sector number of each header of the header field 11 provided between land sectors has a relationship as shown in FIG. For example, a description will be given taking a sector number of each header provided between the land sector L21 and the land sector L22 as an example. Header 1 is located between land sector L21 and land sector L22.
Field H32-1, header 2 field H32-
2, a header 3 field H22-3 and a header 4 field H22-4. The sector number of the header 1 field H32-1 is (n + N), and the sector number of the header 2 field H32-2 is (n + N).
N), the sector number of the header 3 field H22-3 is (n + 2N), and the sector number of the header 4 field H22-4 is (n + 2N). That is, when the sector numbers of the headers provided between the land sector and the land sector are compared, the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is found. To establish.

That is, by reproducing the header, (sector number of header 1 field or header 2 field)>
If the relationship of (sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a groove sector (groove track).
And a reproduction process corresponding to a groove sector can be performed. Conversely, by header playback,
If the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a land sector (land track). Thus, the reproduction process corresponding to the land sector can be performed.

Next, with reference to FIGS. 7 and 8, a description will be given of a header field provided between a groove sector and a land sector, that is, at a transition between a groove and a land.

The header field 11 is provided with a plurality of pits P as shown in FIG. The centers of the pits constituting the header 3 field H20-3 and the header 4 field H20-4 are located on an extension of a tangent between the groove sector G10 and the land sector L20. Header 1
Field H30-1 and header 2 field H30-
The center of the pit constituting the second sector 2 exists on an extension of a tangent line between the land sector L20 and the groove sector G30 (or the groove sector G1n and the land sector L2n). Header 3 field H40-3 and header 4 field H40
The center of the pits constituting -4 is the groove sector G30.
And the land sector L40 (or the land sector L2n and the groove sector G3n). Header 1 field H50-1 and header 2 field H5
The center of the pit constituting 0-2 is located at the land sector L40.
And the groove sector G50 (or the groove sector G3n and the land sector L4n). Header 3 field H60-3 and header 4 field H
The center of the pit constituting 60-4 is the groove sector G
50 and the land sector L60 (or the land sector L4n and the groove sector G5n).
The center of the pits constituting the header 1 field H70-1 and the header 2 field H70-2 is the land sector L
It exists on an extension of the tangent line between the groove sector 60 and the groove sector G70.

The sector number of each header of the header field 11 provided between the land sector and the groove sector (when changing from the land sector to the groove sector) has a relationship as shown in FIG. For example, a description will be given taking a sector number of each header provided between the land sector L2n and the groove sector G30 as an example. Between the land sector L2n and the groove sector G30, a header 1 field H30-1, a header 2 field H30
-2, a header 3 field H40-3, and a header 4 field H40-4. Also, header 1
The sector number of the field H30-1 is (m + 3
N), the sector number of the header 2 field H30-2 is (m + 3N), the sector number of the header 3 field H40-3 is (m + 2N), and the header 4 field H40.
The sector number of -4 is (m + 2N). That is,
Comparing the sector number of each header provided between the land sector and the groove sector, the relationship of (sector number of header 1 field or header 2 field)> (sector number of header 3 field or header 4 field) is established. .

On the other hand, the sector number of each header of the header field 11 provided between the groove sector and the land sector (when changing from the groove sector to the land sector) has a relationship as shown in FIG. For example, a description will be given taking a sector number of each header provided between the groove sector G3n and the land sector L40 as an example. A header 1 field H50-1 and a header 2 field H50 are provided between the groove sector G3n and the land sector L40.
-2, a header 3 field H40-3, and a header 4 field H40-4. Also, header 1
The sector number of the field H50-1 is (m + N),
The sector number of the header 2 field H50-2 is (m
+ N), the sector number of the header 3 field H40-3 is (m + 2N), and the sector number of the header 4 field H40-4 is (m + 2N). That is, when the sector numbers of the headers provided between the groove sector and the land sector are compared, the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is satisfied. To establish.

That is, by reproducing the header, (sector number of header 1 field or header 2 field)>
If the relationship of (sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a groove sector (groove track).
And a reproduction process corresponding to a groove sector can be performed. Conversely, by header playback,
If the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a land sector (land track). Thus, the reproduction process corresponding to the land sector can be performed.

As described above with reference to FIG. 5 to FIG. 8, the size of the header 1 field (or header 2 field) and the header 3 field (or header 4 field) obtained by header reproduction indicates that It is possible to identify whether the (track) is a land sector (land track) or a groove sector (groove track).

Further, the positional relationship of the header field with respect to the groove sector (groove track) and the land sector (land track) will be described.

The groove track and the land track are 1
A system that switches every lap is called a single spiral system. As described above, by recording the header field between the land track and the groove track in the optical disk employing the single spiral system, cutting by one beam can be realized. A sector located at the switching between the groove track and the land track is called a first sector.
FIGS. 7 and 8 described above show the header field of the first sector. In FIGS. 5 to 8, when the track is spirally tracked, the tracking polarity changes to land, groove, land, groove,.
It switches to.

As described above, in the single spiral system in which the groove and the land are switched at every turn, it is necessary to switch the polarity between the groove track and the land track at the time of tracking. Therefore, the sector where the groove track is switched to the land track or the sector where the land track is switched to the groove track has a different header arrangement from other sectors.

Here, a method of manufacturing an optical disk will be briefly described. First, a glass disk is produced. A photoresist (photosensitive resin) is applied to the glass disk to produce a photoresist disk. The photoresist disk is rotated, and the rotating photoresist disk is irradiated with laser light, and tracks and headers are exposed and recorded on the photoresist disk. When a photoresist disc on which tracks and headers are exposed and recorded is developed, the exposed portions of the photoresist dissolve in the developing solution, and tracks and headers are formed on the photoresist disc.

The process of forming tracks and headers on the photoresist disk in this manner is called a cutting process, and this cutting process is realized by a cutting device. That is, the cutting apparatus is provided with an optical head for irradiating the photoresist disk with laser light. Further, metal is deposited on the photoresist disc on which the tracks and the header are formed, and a master disc is manufactured. The master is plated with Ni, and the Ni plating layer is peeled from the master.
The peeled Ni plating layer becomes a mold of an optical disk called a stamper. Then, an optical disk is manufactured using the stamper as a mold.

In the cutting process described above,
The optical head of the cutting device is
The movement at a constant speed from the inner circumference to the outer circumference is performed by the track pitch. A portion irradiated with the laser beam becomes a groove, and a portion not irradiated becomes a land.

FIG. 8 shows sector numbers m, (m + N),
A first sector of (m + 2N) for three tracks is shown. In the cutting process, after the land sector L4n, the land sector L4n is shifted outward by a half track pitch from the center of the track, and the header 1 field H50-1 and the header 2 field H
50-2 is recorded. Further, the header 1 field H50-3 and the header 2 field H50-4 are recorded shifted inward from the center of the track of the land sector L4n by a half track pitch.

The mirror section is generated when laser light is not irradiated. The groove portion is generated by irradiating a laser beam. At this time, the groove is formed in a wave shape by sine-wave oscillating the laser beam spot from the inner circumference to the outer circumference at a period of 186 channel bits. This signal component can be used as a reference signal for clock generation during data writing. Sector number m
The recording from one turn to the sector number (m + N-1) is performed according to the procedure described above. One round from the sector number (m + N) to the sector number (m + 2N-1) is not irradiated with laser light. By repeating this operation, a header field as shown in FIG. 8 is formed.

FIGS. 5 and 6 show header structures other than the first sector. By the cutting process as described above, the header 1 field and the header 2 field which are the first half header and the header 3 field and the header 4 field which are the second half header of the groove sector are recorded. Note that the first half header and the second half header of the land sector are recorded with a difference of one turn.

Next, the structure of the optical disk will be described with reference to FIG.

The substrate 200 of the optical disk is made of a transparent material such as plastic, and is copied by a mold called a stamper. A header field and a recording field are recorded on the substrate 200. Header information is recorded in the header field by emboss pits P. A groove track GT and a land track LT are formed in the recording field.

As viewed from the side where the reproduction laser beam is incident, the emboss pit P has a convex shape, the groove track GT has a convex shape, and the land track LT has a concave shape. Substrate 1
A protective film 201, a recording film 202, a protective film 203, and a reflective film 204 are sequentially formed on the uneven recording surface 00 from the substrate 200 side. The chain line in the figure indicates the groove track GT.
Alternatively, it indicates the center of the land track LT. The emboss pits P constituting the header field are located at Wt / 2 from the center lines of the groove track GT and the land track LT.
Located on the line shifted only by. Here, Wt indicates a track pitch, and is a distance between the center of the groove track GT and the center of the land track LT.

The emboss pits P are the groove tracks G
When the T is cut, the laser spot is wobbled by Wt / 2 to generate a staggered shape.

As shown in FIGS. 6 and 8, by providing the staggered emboss pits P in the header field, it is not necessary to make the width of the groove track GT different from the diameter of the emboss pits P. That is, the groove track GT and the emboss pit P can be cut by the same beam. Therefore, the cutting device can be greatly simplified.

Next, the cutting apparatus will be described with reference to FIGS. FIG. 10 is a diagram showing a schematic configuration of a cutting device. FIG. 11 is a diagram for explaining the cutting modulation signal and the wobble control signal generated by the format circuit of the cutting device.
FIG. 12 is a diagram for explaining a cutting modulation signal for forming a single spiral.

First, a schematic configuration of the cutting device will be described with reference to FIG. Laser light (Ar laser or Kr laser) emitted from the laser light source 141
Is incident on a laser optical axis control system 142 for adjusting the optical axis. In the laser optical axis control system 142, the optical axis of the laser light is adjusted. The laser light passing through the laser optical axis control system 142 is reflected by a mirror 143 and is output from the format circuit 14.
The beam enters the beam modulation system 144 controlled at 9.

The beam modulation system 144 includes an acousto-optic modulator (AOM) 144a and an acousto-optic modulator (AOM). The acousto-optic modulator 144a modulates the laser light according to the cutting modulation signal supplied from the format circuit 149. The acousto-optic deflector 144b
The laser beam is deflected according to an instruction supplied from the format circuit 149. The format circuit 149 is a ROM
And a wobble control signal indicating a wobble amount and a wobble direction. The ROM 150 will be described later in detail.

The laser light incident on the beam modulation system 144 is modulated by the acousto-optic modulator 144a and deflected by the acousto-optic deflector 144b. This beam modulation system 1
The laser light passing through 44 enters a beam shaping system 145 including a pinhole and a slit. Beam shaping system 14
In 5, the beam diameter and shape of the laser beam are adjusted. The laser light having passed through the beam shaping system 145 is incident on the beam monitor system 146. The beam monitor system 146 monitors the beam shape of the laser light.

The laser beam passing through the beam monitor system 146 is guided by the mirror-147, focused and irradiated on the photoresist board 140 by the objective lens 148. The photoresist disc 140 is a glass disc coated with a photoresist. The portion of the photoresist disc irradiated with the laser beam has a concave shape due to the etching.

At the time of cutting, the photoresist disc 140 is rotated at a constant speed by the spindle motor 139. Further, the photoresist disc 140 is moved in a predetermined direction by the feed screw 151 while being integrated with the spindle motor 139. This movement causes the objective lens 1
The laser light irradiated through 48 is moved from the inner peripheral side to the outer peripheral side of the photoresist disc 140. Incidentally, the feed screw 151 is controlled by the feed control device 152 so that the photoresist disk 14 integrated with the spindle motor 139 is integrated.
Move 0. Under the control of the feed control device 152, the laser beam is moved from the inner peripheral side to the outer peripheral side by a track pitch for one rotation of the photoresist disc 140. The portion irradiated with the laser beam thus moved is a group track, and the portion not irradiated is a land track. Further, the embossed pits constituting the header field are formed by blinking the laser light.

Here, the ROM 150 provided in the format circuit 149 will be described. The ROM 150 stores a conversion table for implementing the 8-16 modulation. This conversion table modulates an 8-bit input code sequence (hereinafter, referred to as source data) into a 16-bit output code sequence (hereinafter, referred to as a conversion code).
That is, a cutting modulation signal is generated based on the conversion code converted by the conversion table.

Next, the cutting modulation signal and the wobble control signal generated by the format circuit 149 will be described with reference to FIG.

The cutting modulation signal is a signal used as a modulation signal of the laser light source 141 of the cutting device. In FIG. 11, it is assumed that the level of the cutting modulation signal is proportional to the output of the laser beam.

The wobble control signal is a signal for controlling the deflection angle in the acousto-optic deflector 144b for shifting the beam position. If the wobble control signal is larger than the zero level, the irradiation position of the beam moves upward with respect to the center position of the track. If the wobble control signal is smaller than the zero level, the beam irradiation position moves downward with respect to the center position of the track.

As shown in FIG. 11, the portion where the wobble control signal has a value larger than zero level, that is, the header 1 and the header 2 are shifted upward from the center position of the track. On the other hand, the portion of the wobble control signal having a value smaller than the zero level, that is, the portions of the header 3 and the header 4 are shifted downward from the center position of the track. In the part where the wobble control signal is at the zero level, that is, in the groove part, a groove is formed at the center position of the track.

When the cutting modulation signal is at a high level, a concave shape is formed on the master. Therefore, when the cutting modulation signal is at a high level, an emboss pit is formed.

Next, a cutting modulation signal for forming a single spiral will be described with reference to FIG.

The cutting modulation signals a to d are all signals corresponding to one round of the track.

A land track LT forming the track a is formed corresponding to the low (LOW) level cutting modulation signal a. A groove track GT forming the track a is formed corresponding to the cutting modulation signal a at a high level.

A land track LT forming the track b is formed corresponding to the low (LOW) level cutting modulation signal b. A groove track GT forming the track b is formed corresponding to the cutting modulation signal b at a high (HIGH) level.

A land track LT forming the track c is formed corresponding to the low (LOW) level cutting modulation signal c. A groove track GT forming the track c is formed corresponding to the cutting modulation signal c at a high (HIGH) level.

A land track LT forming the track d is formed corresponding to the low (LOW) level cutting modulation signal d. A groove track GT forming the track d is formed corresponding to the cutting modulation signal d at a high level.

By switching the cutting modulation signal between the cutting modulation signal a, the cutting modulation signal b, the cutting modulation signal c, and the cutting modulation signal d each time the photoresist disk makes one rotation, a single spiral structure is realized.

Next, an optical disc device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a diagram showing a schematic configuration of the optical disk device. FIG. 14 shows a data reproduction circuit 1 of the optical disk device.
It is a figure which shows schematic structure of. FIG. 15 is a diagram showing a schematic configuration of a data reproduction circuit 2 of the optical disk device.

First, a schematic configuration of the optical disk device will be described with reference to FIG.

The optical disk device irradiates the optical disk 1 with a converging light beam, receives reflected light of the light beam from the optical disk 1, and records the reflected light on the optical disk 1 reflected on the received reflected light. The reproduced data is reproduced. The optical disk device irradiates the optical disk 1 with a light beam and records data on the light beam 1.

As shown in FIG. 13, the optical disc 1 is loaded on the spindle motor 23 while being held by the cartridge 21. The optical disc 1 is rotated by the spindle motor 23, for example, at a different rotation speed for each zone. This spindle motor 23
Are controlled by the motor control circuit 24.

The reproduction of data recorded on the optical disk 1 is performed by the optical head 25. The spindle motor 23 and the optical head 25 are provided on a fixed base as described later.

The optical head 25 includes a linear motor 26
Is fixed to a drive coil 27 which constitutes a movable portion of the motor, and the drive coil 27 is connected to a linear motor control circuit 28.

On the other hand, a speed detector 29 is connected to a linear motor control circuit 28 for driving the linear motor 26. The speed signal of the optical head 25 detected by the speed detector 29 is transmitted to the linear motor control circuit 28. And the moving speed of the optical head 25 is controlled.

The objective lens 30 is provided on the carriage 70 of the optical head 25, and is supported by a wire or a leaf spring (not shown). This objective lens 3
0 is moved in the focusing direction (the direction of the optical axis of the lens) by the drive coil 31 and the drive coil 3
2 moves in the tracking direction (the direction orthogonal to the optical axis of the lens).

A semiconductor laser 39 as an irradiating means for irradiating a light beam is driven by a laser driving circuit 35 to generate a laser beam. Laser drive circuit 35
Is a photodiode P for monitoring the semiconductor laser 39.
The light amount of the laser beam generated by the semiconductor laser 39 is corrected according to the monitor current from D.

The laser drive circuit 35 includes a PLL (not shown).
It operates in synchronization with a clock signal for data recording or data reproduction from a circuit. This PLL circuit divides the frequency of a basic clock signal from an oscillator (not shown) to generate a clock signal for data recording or data reproduction. In the laser drive circuit 35, the semiconductor laser 3
When a laser beam for data recording is generated from step 9, control is performed so as to generate a high-output laser beam higher than the laser beam for data reproduction by a predetermined level.

The laser beam generated by the semiconductor laser 39 driven by the laser drive circuit 35 is collimated by the collimator lens 40, and the optical path is bent by the half prism 41 at a substantially right angle.
That is, the semiconductor laser 39 is formed by the half prism 41.
Is emitted toward the optical disc 1 in a collimated state. This laser beam is focused on the data recording surface of the optical disc 1 by the objective lens 30.

The light beam reflected from the data recording surface of the optical disk 1 passes through the objective lens 30 and the half prism 41, passes through the condenser lens 42 and the cylindrical lens 43, and detects light as detection means. Vessel 4
It is led to 4.

The photodetector 44 is composed of, for example, four divided photodetection cells 44a, 44b, 44c and 44d.

The light detection cell 4 included in the light detector 44
The output signal of 4a is supplied to an adder 46a via an amplifier 45a.
The output signal of the photodetection cell 44b is supplied to one end of an adder 46b via an amplifier 45b.
The output signal of the light detection cell 44c is supplied to the other end of the adder 46a via the amplifier 45c.
The output signal of d is supplied to the other end of the adder 46b via the amplifier 45d.

The output signal of the photodetector cell 44a included in the photodetector 44 is supplied to one end of an adder 46c via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied via an amplifier 45b. It is supplied to one end of the adder 46d. The output signal of the light detection cell 44c is
The output signal of the photodetector cell 44d is supplied to the other end of the adder 46d via the amplifier 45d via the amplifier 45d.
6c is supplied to the other end.

The output signal of the adder 46a is a differential amplifier O
The output signal of the adder 46b is supplied to a non-inverting input terminal of the differential amplifier OP2. Thus, the differential amplifier OP2 includes the adder 46a,
A signal relating to the focus point, that is, a focus error signal is supplied to the focusing control circuit 47 in accordance with the difference 46b. The output signal from the focusing control circuit 47 is supplied to the drive coil 31, and is controlled so that the laser beam is always just focused on the data recording surface of the optical disc 1.

The output signal of the adder 46c is the differential amplifier O
The output signal of the adder 46d is supplied to the non-inverting input terminal of the differential amplifier OP1. As a result, the differential amplifier OP1 includes the adder 46c,
A tracking error signal is supplied to the tracking control circuit 48 according to the difference of 46d. Tracking control circuit 48
Creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 48 is supplied to the drive coil 32 in the tracking direction. The tracking error signal used in the tracking control circuit 48 is also supplied to the linear motor control circuit 28.

The sum signal of the outputs of the photodetection cells 44a to 44d of the photodetector 44 in the state where the focusing control and the tracking control are performed, that is, the adder 4
The signal obtained by adding the output signals from 6c and 46d by the adder 46e reflects a pit formed on the track, that is, a change in reflectance from the recording data. This signal is supplied to a data reproducing circuit 38 as reproducing means.
In the data reproducing circuit 38, data recorded on the data recording surface of the optical disk is reproduced.

The reproduced data reproduced by the data reproducing circuit 38 is subjected to error correction by an error correction circuit 52 as an error correction means using an error correction code ECC added to the reproduced data, and then the interface circuit 55 Optical disk control device 56 as an external device through
Is output to

A data generation circuit 34 is provided at a stage preceding the laser drive circuit 35. The data generation circuit 34 receives the format data of the ECC block as the recording data supplied from the error correction circuit 52,
Recording EC with synchronization code for ECC block
An ECC block data generation circuit 34a for converting the data into C block format data, and a modulation circuit 34b for modulating the recording data from the ECC block data generation circuit 34a by the 8-16 modulation method are provided.

The data generation circuit 34 is supplied with recording data to which an error correction code has been added by the error correction circuit 52 and error check dummy data read from the memory 10. To the error correction circuit 52, recording data from an optical disk control device 56 as an external device is supplied via an interface circuit 55 and a bus 49.

The error correction circuit 52 converts the 32 Kbytes of recording data supplied from the optical disk control unit 56 to 4K bytes.
The horizontal and vertical error correction codes are added to the recording data in the unit of sector for each byte, the sector ID (logical address number) is added, and the ECC is added.
Generate block format data.

Further, the optical disk device has a focusing control circuit 47 and a tracking control circuit 4 respectively.
8, and a D / A converter 51 used to exchange information between the linear motor control circuit 28 and the CPU 50 that controls the entire optical disk device.

Motor control circuit 24, linear motor control circuit 28, laser drive circuit 35, data reproduction circuit 38, focusing control circuit 47, tracking control circuit 4
8. The error correction circuit 53 and the like are connected to the CPU via the bus 49.
50. The CPU 50 has a memory 1
A predetermined operation is performed by the control program recorded in “0”.

The memory 10 stores a control program and is used for data recording. This memory 10
Is a table 10 in which the relationship between speed data (number of revolutions) and the number of sectors in one track is recorded for each zone.
a.

Next, the schematic structure of the data reproduction circuit 38 (data reproduction circuit 1) will be described with reference to FIG.

The signal supplied to the data reproduction circuit 38 (the signal output from the adder 46e) is
Supplied to The PLL circuit 100 extracts data and the clock from the signal. The data and clock extracted by the PLL circuit 100 are output to the AM detection circuit 10.
2 is supplied. The AM detection circuit 102 is a PLL circuit 1
Address mark (AM) from data supplied from 00
Is detected. When an address mark is detected by the AM detection circuit 102, a timing control signal is generated by the timing generation unit 104 based on the detection of the address mark.

On the other hand, the data extracted by PLL circuit 100 is also supplied to S / P conversion section 106. S / P
The conversion unit 106 converts serial data supplied from the PLL circuit 100 into parallel data. The parallel data converted by the S / P converter 106 is supplied to the 8/16 demodulator 108. The 8/16 demodulation unit 108 performs S / P
8 for the parallel data supplied from the conversion unit 106
/ 16 demodulation processing is performed. Thereby, the 8/16 demodulation unit 1
08 to 8 bits of demodulated data are output.

As shown in FIG. 4, the 4-byte data after the address mark recorded in the AM field is a PID.
Data. Further, two bytes after the PID data are IED data. Therefore, the timing generator 1
The reproduction of the PID data and the IED data is realized by the timing control signal generated by the control unit 04, that is, the timing reference signal generated based on the detection of the address mark.

Here, the control of the register by the register control section 110 will be described. I in the IED1 field
If it is determined from the ED data that there is no error in the PID1 data in the PID1 field, the PID number included in the PID1 field is referred to. As described above, “00” is recorded as the PID number in the PID1 field. In the PID2 field, "01" is recorded as a PID number.
In the PID3 field, “1” is set as the PID number.
0 ”is recorded in the PID4 field.
“11” is recorded as the D number. That is,
By referring to the PID number, PID1 data, PID2 data, PID3 data, and PID4 data are distinguished. When “00” is confirmed as the PID number, the register control unit 110
The PID1 data of the PID field including the number (PID1 field) is written to the register REG1. Conversely, if "00" is not confirmed as the PID number, no data is written to the register REG1.

Similarly, PID2 data in the PID2 field is written into register REG2 by register control section 110. PID3 of PID3 field
Data is written to register REG3. The PID4 data in the PID4 field is written to the register REG4.

The priority adding section 112 determines which of PID1 data and PID2 data has priority,
It is determined which of the data and the PID4 data has priority. That is, the priority order adding unit 112 functions as a priority selecting unit. In this embodiment, PID2 data and PID4 data are given priority. 5 to 9
As shown in the figure, the PID3 field and the PID4 field are formed in a staggered manner with respect to the PID1 field and the PID2 field. The PID1, PID2, PID3, and PID4 fields are formed on an extension of the boundary between the land track and the groove track. Therefore, P
The PID2 data in the ID2 field is reproduced relatively more stably than the PID1 data in the PID1 field.
The PID4 data in the PID4 field is the PID4
Reproduced relatively stably from PID3 data of three fields. That is, by giving priority to the PID2 data and the PID4 data, the reliability of the data in the PID field can be improved.

Of course, PID1 data and PID3 data may be given priority, PID1 data and PID4 data may be given priority, and PID2 data and PID3 data may be given priority.

The priority adding section 112 outputs a PID2 selection signal indicating selection of PID2 data to the selection section SEL1. Further, the priority adding unit 112 selects the selecting unit S
PID4 indicating selection of PID4 data for EL2
Output the selection signal.

When PID1 data is written in register REG1, selector SEL1 stores register REG1.
1 supplies PID1 data. Similarly, when PID2 data is written in the register REG2, PID2 data is supplied from the register REG2 to the selector SEL1. Further, the selection unit SEL1 includes a PI
A D2 selection signal is supplied. PID1 in the selector SEL1
If the data and the PID2 data are prepared, the selector SEL1 selects the PID2 data according to the PID2 selection signal. When only the PID1 data is prepared in the selection unit SEL1, this selection unit SEL1
Select ID1 data. That is, the selection unit SEL1
Functions as priority selection means. The PID1 data or PID2 data selected by the selection unit SEL1 is
4 and the ID calculation unit 116.

On the other hand, when PID3 data is written in register REG3, PID3 data is supplied from register REG3 to selector SEL2. Similarly, when PID4 data is written to the register REG4, the selector SEL2 stores the PID4 data from the register REG4.
Four data are supplied. Further, a PID4 selection signal is supplied to the selector SEL2. If PID3 data and PID4 data are prepared in the selector SEL2, the selector SEL2 responds to the PID4 selection signal and
Select D4 data. It should be noted that the selection unit SEL2 has
When only three data are prepared, the selection unit S
EL2 selects PID3 data. That is, the selection unit S
EL2 functions as priority selection means. Selector SEL
The PID3 data or PID4 data selected in 2 is
It is supplied to the comparison unit 114 and the calculation unit 116.

The comparing section 114 includes a sector number included in the PID data (PID1 data or PID2 data) supplied from the selecting section SEL1, and a PID data (PID3 data or PID4 data) supplied from the selecting section SEL2.
Data) is compared with the sector number included in the data. That is, the land track and the groove track are identified by comparing the magnitude relationship between the sector number included in the PID data supplied from the selection unit SEL1 and the sector number included in the PID data supplied from the selection unit SEL2. That is, the comparing unit 114 functions as an identification unit. Then, the comparison unit 114 supplies the identification result (land / groove) to the calculation unit 116.

(Sector number included in PID data supplied from selection unit SEL1)> (sector number included in PID data supplied from selection unit SEL2)
In the case of, the track following these PID data is identified as a groove track. Conversely, (selection section SEL
In the case of (sector number included in PID data supplied from 1) <(sector number included in PID data supplied from selection unit SEL2), tracks following these PID data are identified as land tracks.

The calculation section 116 calculates a sector number based on the comparison result (land / groove) supplied from the comparison section 114. Comparing unit 11 with respect to calculating unit 116
When the comparison result (land) is supplied from No. 4, the calculation unit 116 outputs the sector number included in the PID data supplied from the selection unit SEL1. That is, when a land track is identified, a sector number included in PID1 data or PID2 data is output. When a comparison result (groove) is supplied from the comparison unit 114 to the calculation unit 116, the calculation unit 11
6 outputs a sector number included in the PID data supplied from the selection unit SEL2. That is, when the track is identified as a groove track, the sector number included in the PID3 data or PID4 data is output.

Here, regarding the calculation of the sector number,
A supplementary explanation is given with reference to FIG.

A header 1 field H12-1 or a header 2 field H12-2 and a header 3 field H22
-3 or the header 4 field H22-4. The magnitude relationship in this case is (sector number of header 1 field H12-1 or header 2 field H12-2)> (sector number of header 3 field H22-3 or header 4 field H22-4).
Therefore, the groove sector G12 is identified as a groove sector (groove track). Further, at this time, the sector number of the groove sector G12 is:
The sector number is included in the header 3 field H22-3 or the header 4 field H22-4.

As another example, header 1 field H32-
It is assumed that 1 or header 2 field H32-2 is compared with header 3 field H22-3 or header 4 field H22-4. The magnitude relation in this case is (Header 1 field H32-1 or Header 2 field H32
-2 sector number) <(Header 3 field H22)
-3 or the sector number of the header 4 field H22-4). Therefore, the land sector L22 is identified as a land sector (land track). Further, at this time, the sector number of the land sector L22 is the sector number included in the header 1 field H32-1 or the header 4 field H32-2.

According to the data reproducing circuit 38 shown in FIG. 14, it is possible to identify whether the target track is a land track or a groove track from the header data included in the header field. That is, the sector number included in the PID1 field or the PID2 field and the PID
By comparing with the sector number included in the ID3 field or the PID4 field, it is possible to identify whether the target track is a land track or a groove track from the comparison result.

This eliminates the need for a conventional configuration for executing land / groove identification processing. The conventional land / groove identification process is a process of identifying a land / groove from a detection state of reflected light of a light beam applied to an optical disk. Further, such a conventional land / groove discrimination process is susceptible to disturbance and is uncertain.

The land / groove discrimination processing of the present invention is performed by the IE
The identification process is performed based on the reliable PID data for which the error has been checked by the D data. Therefore, according to the land / groove identification processing of the present application, an identification processing that is more reliable than the conventional land / groove identification processing is realized.

Further, the data reproducing circuit 38 shown in FIG.
The PID1 data and P
Which ID2 data is prioritized, and PID3
It is determined which of the data and the PID4 data has priority. At this time, by giving priority to PID2 and PID4, more reliable identification processing can be realized.

Next, a schematic configuration of the data reproducing circuit 38 (data reproducing circuit 2) will be described with reference to FIG. The data reproduction circuit shown in FIG. 15 is a modification of the data reproduction circuit shown in FIG. Here, only differences from the data reproduction circuit shown in FIG. 14 will be described, and description of common parts will be omitted.

The land / groove determination unit 118 identifies a land track and a groove track from the detection result of the reflected light of the light beam applied to the optical disk, and
The identification result (land / groove) is output. That is, the land / groove determination unit 118 functions as an identification unit. The identification result (land / groove) output from the land / groove determination unit 118 is supplied to the collation unit 120. The identification result (land / groove) output from the comparing unit 114 is also supplied to the matching unit 120.

The collation unit 120 collates the identification result output from the comparison unit 114 with the identification result output from the land / groove determination unit 118. The identification result is supplied to the calculation unit 116 only when the two identification results match.
That is, the matching unit 120 functions as an identification unit. If the two identification results do not match, the identification result is not supplied to the calculation unit 116, and the mismatch between the identification results is indicated by C in FIG.
Notify PU50. Upon receiving this notification, the CPU 50
Each part is instructed to retry the reproduction of the header part.

That is, the data reproducing circuit shown in FIG.
Identification result of comparison section 114 and land / groove determination section 1
The final land / groove identification is performed on the basis of the identification results of the two. Therefore, according to the data reproducing circuit shown in FIG. 15, it is possible to perform a more reliable identification process than the data reproducing circuit shown in FIG.

[0157]

According to the present invention, the following optical disk and optical disk device can be provided.

(1) An optical disk device capable of improving the identification accuracy for identifying land tracks and groove tracks.

(2) An optical disc that can contribute to the achievement of the objective of improving the accuracy of discrimination between land tracks and groove tracks.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a concept of a zone of a data recording area of an optical disc.

FIG. 2 is a diagram for explaining an outline of a data structure of a data recording area of the optical disc.

FIG. 3 is a diagram for explaining a rotation speed corresponding to each zone of the optical disc and the number of sectors per track in each zone.

FIG. 4 is a diagram for explaining a sector format of an optical disc.

FIG. 5 is a diagram for explaining a header field provided between a groove sector and a groove sector or between a land sector and a land sector.

FIG. 6 is a diagram for explaining a header field provided between a groove sector and a land sector or a land sector.

FIG. 7 is a diagram for explaining a header field provided between a groove sector and a land sector.

FIG. 8 is a diagram for explaining a header field provided between a groove sector and a land sector.

FIG. 9 is a perspective view showing the structure of an optical disc.

FIG. 10 is a diagram showing a schematic configuration of a cutting device.

FIG. 11 is a diagram illustrating a cutting modulation signal and a wobble control signal generated by a format circuit of the cutting device.

FIG. 12 is a diagram for explaining a cutting modulation signal for forming a single spiral.

FIG. 13 is a diagram showing a schematic configuration of an optical disk device.

FIG. 14 is a diagram showing a schematic configuration of a data reproducing circuit 1 of the optical disc device.

FIG. 15 is a diagram showing a schematic configuration of a data reproduction circuit 2 as a modification of the data reproduction circuit 1 shown in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 5 ... Optical head 10 ... Memory 38 ... Data reproduction circuit 35 ... Laser drive circuit 39 ... Semiconductor laser 50 ... CPU 100 ... PLL circuit 102 ... AM detection part 104 ... Timing generation part 106 ... S / P conversion part 108 ... 8/16 modulating section 110 register register section 112 priority adding section 114 comparing section 116 calculating section 118 land / groove determining section 120 matching section REG1, REG2, REG3, REG4 register SEL1, SEL2 selecting section

Claims (15)

[Claims] 1. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral, each including a first, a second, and a third groove track which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area where one end of the land track touches, and the header area on a boundary extension line between the first land track and the second groove track. There, first the first identification data is embossed recorded
And a second identification data different from the first identification data is disposed in the header area on a boundary extension line of the second groove track and the second land track. An optical disc, comprising: a second header section on which is recorded. 2. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral shape, each track including first, second, and third groove tracks which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area where one end of the land track touches, and the header area on a boundary extension line between the first land track and the second groove track. There, first the first identification data is embossed recorded
And a second header having a value smaller than the value indicated by the first identification data, wherein the header is located in the header area on a boundary extension line between the second groove track and the second land track. A second header portion in which the identification data of the second identification information is emboss-recorded; and a second header portion on a boundary extension line between the second land track and the third groove track, wherein the second identification portion is provided. An optical disc, comprising: a third header portion in which third identification data having a value smaller than the value indicated by the data is emboss-recorded. 3. An optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, comprising: an irradiating unit for irradiating the optical disk with a light beam; Detecting means for detecting the reflected light of the light beam; reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and data reproduced by the reproducing means. An identification means for identifying a land track and a groove track from predetermined identification data included in the optical disk device. 4. An optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, irradiating means for irradiating the optical disk with a light beam; Detecting means for detecting the reflected light of the light beam; reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and data reproduced by the reproducing means. Priority selecting means for preferentially selecting predetermined identification data from a plurality of pieces of identification data included in the data, and a land track and a groove track are selected from the predetermined identification data preferentially selected by the priority selecting means. An optical disk device comprising: an identification unit for identifying; 5. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral shape, each track including first, second, and third groove tracks that are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area where one end of the land track touches, and the header area on a boundary extension line between the first land track and the second groove track. There, first the first identification data is embossed recorded
And a second identification data different from the first identification data is disposed in the header area on a boundary extension line of the second groove track and the second land track. An optical disc device for reproducing data recorded on an optical disc, comprising: a second header part recorded on the optical disc; and irradiating means for irradiating the optical disc with a light beam; Detecting means for detecting the reflected light of the light beam, and reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and Identification means for identifying a land track and a groove track from the first and second identification data included in the data. An optical disk device characterized by the above. 6. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral shape, each track including first, second, and third groove tracks which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area where one end of the land track touches, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which substantially identical first and second identification data are emboss-recorded; and a header region on an extension of a boundary between the second groove track and the second land track. And a second header portion on which substantially identical third and fourth identification data are emboss-recorded. An optical disc device for reproducing data recorded on an optical disc, comprising: Irradiating means for irradiating the optical disc with a light beam; detecting means for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disc; reflecting the reflected light detected by the detecting means A reproducing means for reproducing the data recorded on the optical disc read from the optical disc; and a second reproducing means for reproducing the second and fourth identification data from the data reproduced by the reproducing means. Priority selecting means for selectively selecting, and identification means for identifying a land track and a groove track from the second and fourth identification data preferentially selected by the priority selecting means. Optical disk device. 7. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral, each of which includes first, second, and third groove tracks that are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area where one end of the land track touches, and the header area on a boundary extension line between the first land track and the second groove track. There, first the first identification data is embossed recorded
And a second header having a value smaller than the value indicated by the first identification data, wherein the header is located in the header area on a boundary extension line between the second groove track and the second land track. A second header portion in which the identification data of the second identification information is emboss-recorded; and a second header portion on a boundary extension line between the second land track and the third groove track, wherein the second identification portion is provided. An optical disk device for reproducing data recorded on an optical disk comprising: a third header portion on which third identification data having a value smaller than the value indicated by the data is embossed; and irradiating the optical disk with a light beam. Irradiating means for detecting reflected light of the light beam emitted from the irradiating means and reflected on the optical disk; and detecting by the detecting means Reproducing means for reproducing data recorded on the optical disk reflected on the reflected light thus obtained; and a land based on the first, second and third identification data contained in the data reproduced by the reproducing means. An optical disc device comprising: an identification unit for identifying a track and a groove track. 8. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral shape, each track including first, second, and third groove tracks which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area where one end of the land track touches, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which substantially identical first and second identification data are emboss-recorded; and a header region on an extension of a boundary between the second groove track and the second land track. A second header portion having a value smaller than the value indicated by the first and second identification data and having substantially the same third and fourth identification data emboss-recorded; And being arranged in the header area on a boundary extension line between the second land track and the third groove track, wherein the value is smaller than the value indicated by the third and fourth identification data and substantially And a third header section on which the same fifth and sixth identification data are emboss-recorded, and an optical disc apparatus for reproducing data recorded on an optical disc, comprising: Irradiating means for irradiating a light beam; detecting means for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disk; and the optical disk reflected on the reflected light detected by the detecting means A reproducing means for reproducing the data recorded in the memory, and a priority selection for preferentially selecting the second and fourth identification data or the fourth and sixth identification data from the data reproduced by the reproducing means. Means for identifying land tracks and groove tracks from the second and fourth identification data or the fourth and sixth identification data preferentially selected by the priority selection means. An optical disk device characterized by the above-mentioned. 9. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral shape, each track including first, second, and third groove tracks which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area where one end of the land track touches, and the header area on a boundary extension line between the first land track and the second groove track. There, first the first identification data is embossed recorded
And a second header having a value smaller than the value indicated by the first identification data, wherein the header is located in the header area on a boundary extension line between the second groove track and the second land track. A second header portion in which the identification data of the second identification information is emboss-recorded; and a second header portion on a boundary extension line between the second land track and the third groove track, wherein the second identification portion is provided. An optical disk device for reproducing data recorded on an optical disk comprising: a third header portion on which third identification data having a value smaller than the value indicated by the data is embossed; and irradiating the optical disk with a light beam. Irradiating means for detecting reflected light of the light beam emitted from the irradiating means and reflected on the optical disk; and detecting by the detecting means Reproducing means for reproducing data recorded on the optical disk reflected on the reflected light thus obtained; and values indicated by the first, second, and third identification data included in the data reproduced by the reproducing means. By comparing
When the value indicated by the second identification data is smaller than the value indicated by the first identification data, the second groove track is identified as a groove track, and the third track is determined by the value indicated by the second identification data. An identification means for identifying the second land track as a land track when the value indicated by the identification data is small. 10. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral, each of which includes first, second, and third groove tracks which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area at which one end of the land track contacts one another, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which substantially identical first and second identification data are emboss-recorded; and the header area on a boundary extension line between the second groove track and the second land track. And a second header section in which the third and fourth identification data having a value smaller than the value indicated by the first and second identification data and substantially the same are emboss-recorded. And arranged in the header area on a boundary extension line between the second land track and the third groove track, the value being smaller than a value indicated by the third and fourth identification data, and And a third header portion on which substantially the same fifth and sixth identification data are emboss-recorded, and an optical disc device for reproducing data recorded on an optical disc, comprising: Irradiating means for irradiating the optical beam with light; detecting means for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disc; and reflecting the reflected light detected by the detecting means. A reproducing unit for reproducing data recorded on the optical disk; and a priority for preferentially selecting the second and fourth identification data or the fourth and sixth identification data from the data reproduced by the reproducing unit. Comparing the value indicated by the second and fourth identification data or the value indicated by the fourth and sixth identification data preferentially selected by the selection means with the second identification data. When the value indicated by the fourth identification data is smaller than the value indicated by, the second groove track is identified as a groove track, and the value indicated by the fourth identification data is smaller than the value indicated by the fourth identification data. When the value indicated by the identification data 6 is small, the optical disk apparatus characterized by comprising a, and identifying means for identifying the second land track as a land track. 11. An optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, irradiating means for irradiating the optical disk with a light beam, irradiating the light beam from the irradiating means and reflecting the light beam on the optical disk. Detecting means for detecting the reflected light of the light beam; reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and data reproduced by the reproducing means. A first identification unit that identifies a land track and a groove track from predetermined identification data included in the first identification data, and a second identification unit that identifies the land track and the groove track according to a detection state of the reflected light detected by the detection unit 2. An optical disk device comprising: (2) an identification means. 12. An optical disk apparatus for reproducing data recorded on an optical disk having land tracks and groove tracks, an irradiating means for irradiating the optical disk with a light beam, and an irradiating means for irradiating the optical disk with the light beam and reflecting it on the optical disk Detecting means for detecting the reflected light of the light beam; reproducing means for reproducing data recorded on the optical disk reflected on the reflected light detected by the detecting means; and data reproduced by the reproducing means. Priority selecting means for preferentially selecting predetermined identification data from a plurality of pieces of identification data included in the data, and a land track and a groove track are selected from the predetermined identification data preferentially selected by the priority selecting means. First identifying means for identifying, and a detection state of the reflected light detected by the detecting means In response, the optical disk apparatus characterized by comprising a second identifying means for identifying the land track and groove track. 13. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral shape, each track including first, second, and third groove tracks which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area at which one end of the land track contacts one another, and the header area on a boundary extension line between the first land track and the second groove track. A is, first the first identification data is embossed recorded
And a second header having a value smaller than the value indicated by the first identification data, wherein the header is located in the header area on a boundary extension line between the second groove track and the second land track. A second header portion in which the identification data of the second identification information is emboss-recorded; and a second header portion on a boundary extension line between the second land track and the third groove track, wherein the second identification portion is provided. An optical disk device for reproducing data recorded on an optical disk comprising: a third header portion on which third identification data having a value smaller than the value indicated by the data is embossed; and irradiating the optical disk with a light beam. Irradiating means for detecting reflected light of the light beam emitted from the irradiating means and reflected on the optical disk; and detecting by the detecting means Reproducing means for reproducing data recorded on the optical disk reflected on the reflected light thus obtained; and values indicated by the first, second, and third identification data included in the data reproduced by the reproducing means. By comparing
When the value indicated by the second identification data is smaller than the value indicated by the first identification data, the second groove track is identified as a groove track, and the third track is determined by the value indicated by the second identification data. When the value indicated by the identification data is small, a first identification means for identifying the second land track as a land track; and a land track and a groove track according to a detection state of the reflected light detected by the detection means. An optical disc device comprising: a second identification unit for identifying the optical disk. 14. A plurality of tracks formed by a plurality of grooves arranged in a discontinuous spiral, each including a first, a second, and a third groove track which are sequentially adjacent in the radial direction. A first land track formed at a position between the first and second groove tracks, wherein the first land track corresponds to a position between radially adjacent grooves. A plurality of land tracks including a second land track formed at a position between the second and third groove tracks; the first, second, and third groove tracks; and the first and second groove tracks And a header area including an area at which one end of the land track contacts one another, and the header area on a boundary extension line between the first land track and the second groove track. A first header portion on which substantially identical first and second identification data are emboss-recorded; and the header area on a boundary extension line between the second groove track and the second land track. And a second header section in which the third and fourth identification data having a value smaller than the value indicated by the first and second identification data and substantially the same are emboss-recorded. And arranged in the header area on a boundary extension line between the second land track and the third groove track, the value being smaller than a value indicated by the third and fourth identification data, and And a third header portion on which substantially the same fifth and sixth identification data are emboss-recorded, and an optical disc device for reproducing data recorded on an optical disc, comprising: Irradiating means for irradiating the optical beam with light; detecting means for detecting reflected light of the light beam irradiated from the irradiating means and reflected on the optical disc; and reflecting the reflected light detected by the detecting means. A reproducing unit for reproducing data recorded on the optical disk; and a priority for preferentially selecting the second and fourth identification data or the fourth and sixth identification data from the data reproduced by the reproducing unit. Comparing the value indicated by the second and fourth identification data or the value indicated by the fourth and sixth identification data preferentially selected by the selection means with the second identification data. When the value indicated by the fourth identification data is smaller than the value indicated by, the second groove track is identified as a groove track, and the value indicated by the fourth identification data is When the value indicated by the identification data of No. 6 is small, a first identification means for identifying the second land track as a land track; and a land track and a land track according to a detection state of the reflected light detected by the detection means. An optical disk device comprising: a second identification unit that identifies a groove track. 15. The apparatus according to claim 11, further comprising control means for validating the identification result only when the identification results by said first and second identification means match. Item 15. The optical disk device according to Item 13 or 14.