JP2002074680A - Optical disk and recording/reproducing device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk such as reducing the deterioration of qual ity of a reproduced signal or the deterioration of a land prepit signal at the time when the zone is changed over, and also to provide a recoding/reproducing device thereof. SOLUTION: In the optical disk 1 on which the land prepit is preliminarily recorded, an information recording part is preliminarily divided into plural zones in the radial direction of the disk and wobbles are recorded by a CAV for every respective zone, then the optical disk 1 of the ZCLV or ZCAV is formed as the result. This optical disk 1 is provided with at least one combined track A consisting of a groove Ga and a land La not forming the land prepit in either of zone k+1 or k at the border part of the plural zones k, k+1. The groove Ga of the combined track A has the period and phase same as those of grooves G3, G4 in the zone k+1 to which the combined track A belongs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc and a recording / reproducing apparatus for the same, and more particularly to an optical disc for storing a digital information signal on a phase change medium or a magneto-optical medium and a recording / reproducing apparatus for the same.

[0002]

2. Description of the Related Art Recording and reproduction can be performed on groove grooves having waviness (hereinafter referred to as wobble) formed on a disk, and auxiliary information (hereinafter referred to as land pre-pits) is previously stored in lands existing between the groove grooves. An optical disk on which recording has been performed is known as a DVD-RW (proposed by DVD Forum).

[0003] Conventionally, Japanese Patent Application Laid-Open No. 9-326138 describes
In this publication, an optical disk similar to a DVD-RW is disclosed. That is, Japanese Patent Application Laid-Open No. 9-326138 discloses an optical disk having wobbled grooves for the purpose of high-density recording and having pits recorded at predetermined intervals in an area between the grooves, and a groove of the optical disk. There is disclosed a recording / reproducing method and a recording / reproducing apparatus for controlling the rotation of an optical disk by a wobble signal detected from a pit and detecting a position of a recording signal on the optical disk by a pit signal detected from a pit.

[0004]

However, in the above-mentioned DVD-RW and the conventional optical disk described in the above-mentioned publication and the recording apparatus and reproducing apparatus therefor, the linear velocity (C
LV) has the following problems because recording and reproduction are performed.

(1) Since there is a portion where adjacent wobbles have an opposite phase, crosstalk from an adjacent track increases, and a plurality of areas which cannot be used for recording due to deterioration of signal quality exist on the disk surface. I do. In addition, since the phases are opposite to each other, problems such as deterioration of the land pre-pit signal occur.

[0008] For example, FIG. 8 is a view conceptually showing a portion of a conventional optical disk where adjacent wobble phases have opposite phases. In the figure, of three grooves G21, G22, G23 adjacent in the disk radial direction,
The phase of the wobbles formed in the groove G22 between the groove G22 and the groove G21 adjacent thereto is inverted as indicated by I, and similarly, the phase of the wobbles in the grooves G22 and G23 is also inverted.

In such a case, in a portion where the distance from the adjacent groove becomes short, the crosstalk from the signal recorded in the adjacent groove becomes large, causing a data error due to signal deterioration or recording already in the recording. Erroneous erasure of the adjacent track that has occurred occurs. Further, in such a portion, the output of the land pre-pit signal cannot be sufficiently obtained, or reading is affected. For this reason, the recording of the digital information signal is not performed for the portions where the wobble phases are opposite to each other between the adjacent grooves.
It was necessary to take measures such as not recording land pre-pits.

(2) When performing a data seek of a large distance in the radial direction of the optical disk, it takes a long time until the rotation speed of the spindle motor for rotating the optical disk falls within a range in which data can be recorded or reproduced. It takes.

(3) When land prepits are present in the same phase in adjacent tracks, reproduction cannot be performed, and a process of changing the phase is required.

In order to solve the problem that the wobble of (1) is out of phase and the quality of data is degraded, a tracking area formed by periodically undulating the header area and the data recording area. Among the recordable and reproducible optical disks having the above-mentioned groove, an optical disk in which the undulation phase of the groove is made coincident between adjacent grooves has been conventionally proposed (Japanese Patent Laid-Open No. 10-255330: Title of Invention "Optical disk and manufacturing thereof"). apparatus").

In the optical disk disclosed in Japanese Patent Application Laid-Open No. H10-255330, although the problem (1) is solved, the solution to the problems (2) and (3) is explicitly mentioned. Absent.

In order to solve this problem, the present applicant has proposed the contents described in Japanese Patent Application No. 2000-060018. In the optical disk proposed in Japanese Patent Application No. 2000-060018, the wobble has a constant angular velocity for each zone (C
AV), and the wobbles adjacent in the radial direction are always configured to have the same phase in each zone. Therefore, the occurrence of crosstalk between tracks caused by the adjacent wobbles having opposite phases is suppressed. In addition, the present invention solves the problem that the pre-pit reproduced signals generated when adjacent pre-pit positions overlap between adjacent lands cancel each other out and a sufficient pre-pit reproduced signal cannot be obtained.

However, a track at the boundary between zones has a CLV (Constant Linear Velocity).
problem). This problem will be described with reference to FIG. FIG. 9 is a diagram showing the zone arrangement of the optical disc. As shown in FIG. 9, the recording area of the optical disk is divided into N zones from zone 0 to zone N-1 concentrically of the disk, and the wobble and land prepit phases are formed for each zone as shown below. Have been. FIG. 10 is a diagram showing the states of grooves, lands, and pre-pits at the boundary between zone k and zone k + 1 of the optical disc disclosed in Japanese Patent Application No. 2000-060018. As shown in FIG. 10, zone k + 1 is on the outer peripheral side adjacent to zone k. In zone k, grooves G1 and G2 are formed in the same phase, and in zone k + 1, grooves G3 and G4 are formed in the same phase. The wobble periods of the grooves G3 and G4 are the same as those of the grooves G1 and G4.
It is higher than 2.

In such an optical disk, at the boundary of the zone, a portion where the wobbles of the adjacent grooves G2 and G3 have opposite phases as shown by a wavy line surrounded portion M in FIG. There is a portion where the position of the land prepit p21 of the adjacent land L2 and the position of the land prepit p31 of the land 3 overlap. When reproducing from the zone k toward the zone k + 1 in such a state, the crosstalk of the reproduction signal increases in the portion surrounded by the dotted line M, or a sufficient land prepit reproduced signal output cannot be obtained in the portion N surrounded by the dotted line. Was. In addition, since the wobble cycle switches abruptly at the boundary between the zone k and the zone k + 1, it takes time to stabilize in the early stage of the reproduction of the zone k + 1, so that a stable reproduction signal cannot be obtained.

Therefore, as shown in FIG. 11, it has been considered to form a combined track for converting the period at the boundary between zone k and zone k + 1. FIG. 11 is a diagram showing an optical disc on which a combined track for converting a period is formed at the boundary between zone k and zone k + 1. In the figure, the combined track T
Consists of a land Lt and a groove Gt. In zone k, grooves G1 and G2 having the same phase are formed in zone k +
In 1, the grooves G3 and G4 having the same phase and the groove Gt of the coupling track T are formed. The wobble cycle of the grooves G3 and G4 in the zone k + 1 is higher than the wobble cycle of the grooves G1 and G2 in the zone k + 1. The wobble cycle of the groove Gt in the zone k + 1 is set to the grooves G1, G2 and G3. , G4.

As described above, the wobble period of the groove Gt is an intermediate value between the wobble periods of the grooves G1 and G2 and the grooves G3 and G4.
The wobble frequency can be smoothly drawn into the channel, but also in this case, the crosstalk of the reproduced signal is caused by the wobbles of the adjacent grooves Gt and G3 having opposite phases, as indicated by a dotted line portion P. Increases, or the land L2
However, since the position of the land prepit p21 of the land L3 and the position of the land prepit p31 of the land L3 overlap, a problem that a sufficient land prepit signal output cannot be obtained still remains.

Accordingly, the present invention has been made to solve the above problems, and has been made in consideration of the following.
An object of the present invention is to provide an optical disc and a recording / reproducing apparatus for the optical disc, which reduce deterioration of the quality of a reproduction signal and deterioration of a land prepit signal.

[0018]

Means for Solving the Problems A first invention of the present invention is:
A groove formed concentrically or spirally from the innermost circumference to the outer circumference of the optical disc; and land portions continuously formed between the groove grooves, wherein the land portion has the groove groove. Has an information recording portion in which auxiliary information used when recording an information signal is recorded in advance as land pre-pits, and this information recording portion is divided into a plurality of zones in the disk radial direction in advance,
One or both sides of the groove are continuously wobbled with a constant frequency in each of the plurality of zones by a constant angular velocity method, and each of the grooves adjacent in the disk radial direction in the zone. An optical disc formed so that the phases of wobbles are always in phase, and a combination of the groove and the land that does not form the land prepit in one of the zones at the boundary between the plurality of zones. An optical disc having at least one track, wherein the groove and groove of the combined track have the same period and phase as those of the groove in the zone to which the combined track belongs. According to a second aspect of the present invention, there is provided the optical disc according to the first aspect, wherein at least one of a total reflection portion and preformed pit information is recorded in a groove of the combined track. According to a third aspect of the present invention, there is provided an optical disk comprising: a groove formed concentrically or spirally from the innermost circumference to the outer circumference of the optical disc; and land portions continuously formed between the groove grooves. The portion has an information recording portion in which auxiliary information used for recording an information signal in the groove is recorded in advance as land pre-pits, and the information recording portion is divided into a plurality of zones in the disk radial direction in advance. At the same time, one or both sides of the groove are continuously wobbled with a constant frequency in each zone of the plurality of zones by a constant angular velocity method, and are adjacent in the disk radial direction in the zone. The wobbles of the groove are formed so that the phases of the wobbles are always in the same phase, and the groove is formed in one of the zones at the boundary between the plurality of zones. It has at least one coupling track composed of a groove and a land that does not form the land prepit, and the groove groove of the coupling track has the same period and phase of the groove groove in the zone to which the coupling track belongs. What is claimed is: 1. A recording / reproducing apparatus for recording / reproducing information on / from an optical disc, comprising: prepit detecting means for detecting a land prepit signal from a reproduction signal of the optical disc; and wobble detection for detecting and outputting a wobble signal from the reproduction signal of the optical disc. Means,
Prepit decoding means for decoding the land prepit signal, wobble frequency phase synchronization means for outputting a wobble frequency synchronized with the prepit phase from the prepit phase from the prepit detection means and the wobble signal from the wobble detection means, A combined track detecting means for detecting the combined track based on the decoded land pre-pit signal and outputting combined track information is provided. According to a fourth aspect of the present invention, the pre-pit detecting means has an output polarity corresponding to both positive and negative with respect to a detection reference level, and when a light spot traces the combined track, a polarity detected from a groove other than the combined track. 4. A recording / reproducing apparatus according to claim 3, wherein a land pre-pit signal having a polarity opposite to that of the signal is detected and used for recording / reproducing control.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIGS. FIG. 1 is an enlarged view of a zone boundary in the optical disc according to the first embodiment of the present invention. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 1, an optical disc 1 according to a first embodiment of the present invention has a groove formed concentrically or spirally (spirally) from the innermost circumference to the outermost circumference (hereinafter simply referred to as a groove). And land portions (hereinafter simply referred to as lands) continuously formed between the grooves, respectively. In the lands, auxiliary information used for recording and reproducing information signals in the grooves is previously set as land pre-pits. In the recorded optical disk, as described above, the information recording section is divided in advance into a plurality of zones in the radial direction of the disk, and the wobble has a constant angular velocity (CA) for each zone.
V), and as a result, ZCLV (Zone Co.
nstant Linear Velocity) or ZCAV (Zone Constant Angl)
er Velocity). A track is formed by a pair of lands and grooves.

The optical disk 1 shown in FIG. 1 shows only the zone k and the zone k + 1 as representatives, but the same applies to other zones. Within the zone k, the phases of the grooves G1 and G2 are equal, and the land L1
A 3-bit pre-pit having a wobble cycle composed of the land pre-pits p11, p12 and p13 recorded in the land L2 is defined as one pre-pit group, and a wobble cycle composed of the land pre-pits p21, p22 and p23 recorded in the land L2. When the 3-bit pre-pits are regarded as one pre-pit group, the pre-pit groups of the land L1 and the pre-pit groups of the land L2 have different phases in the disk circumferential direction (here, alternately for each pre-pit group). Are located.

Similarly, in the zone k + 1,
The phases of the grooves Ga, G3 and G4 are equal and the land L
3 is a wobble period composed of land prepits p31, p32 and p33, which is a one-bit prepit group, and a wobble period composed of land prepits p41, p42 and p43 recorded on land L4. When the 3-bit land pre-pits are regarded as one pre-pit group, the pre-pit groups of the land L3 and the pre-pit groups of the land L4 have different phases in the disk circumferential direction (here, each pre-pit group (Alternating).

In FIG. 1, the land prepits are arranged at the peak position of the wobble amplitude. Further, although it is illustrated that all 3-bit prepits are present, the bit value is set to 1 when a land prepit exists, and the bit value is set to 0 when no land prepit exists. 1 or 0 of data by bit combination
Express. The above-mentioned phase relationship of the pre-pit groups is the same at other positions of the optical disk, and the pre-pit groups are alternately arranged in the disk circumferential direction between two lands adjacent to each other in the disk radial direction in each zone. Have been.

Grooves Ga, G3, G in zone k + 1
The wobble period of No. 4 corresponds to the grooves G1 and G2 in the zone k.
Shorter than. The coupling track A, which is a feature of the first embodiment of the present invention, includes a land La and a groove Ga.
No land pre-pit is formed on the land La, and no information is recorded on the groove Ga.

According to the first embodiment of the present invention, in the optical disc 1, the phase of each groove in each zone is equal, the pre-pit groups are arranged at different phases in the circumferential direction of the disc, and the zones k and At the boundary of k + 1, there is a coupling track A consisting of a groove Ga on which no information is recorded and a land La on which no land pre-pits are formed in the zone k + 1. To prevent the crosstalk of the reproduction signal and the land prepits p21, p22, p of the land L2.
23 and land prepits p31 and p3 of land L3
2. Deterioration of the reproduced signal of p33 can be prevented. Also, a groove Ga having a cycle shorter than the cycle of the grooves G1 and G2,
Even if it is changed to G3 or G4, the signal of the groove G3 and the land pre-pits p31, p32 and p33 are reproduced after being adjusted to the period of the groove G3 by the combined track A and reproduced so that reproduction is possible. Delay can be prevented.

In the first embodiment of the present invention, no information was recorded on the groove Ga of the combined track A. However, as shown in FIG. 2, the groove Ga position not corresponding to the pre-pit group in the disk circumferential direction. The pit information of a single frequency can be recorded on the optical disk, and the presence or absence of the pit information can be used to prevent illegal copying of the optical disk.

The pit information modulated using the pit Q instead of the pit information of a single frequency may be formed. For example, the modulated pit information includes MFM modulation in which the carrier frequency is selected in a frequency region that does not affect the recording / reproducing data. In this case, not only the presence or absence of pit information,
It is possible to record more additional information. Further, as shown in FIG.
A total reflection portion (mirror portion) R may be formed in a part of the optical disk to reduce the tracking offset. Note that the pits Q and the total reflection portions R may be formed in combination.

The first embodiment of the present invention is suitable for an optical disk in which the track interval is relatively wide. Further, although the combined track A is formed on the zone k + 1 side, a similar effect can be obtained by forming the combined track A on the zone k side. As described above, the same effect can be obtained by forming the combined track A in any one of the boundaries of each zone. Further, in the physical format configuration, a configuration in which the combined track A is not included in the zone can provide the same effect.

Next, a description will be given of a second embodiment of the present invention with respect to an optical disk having a narrow track interval. FIG. 4 is an enlarged view of a zone boundary in the optical disc according to the second embodiment of the present invention. The same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 4, the optical disc 2 according to the second embodiment of the present invention
Is a combined track B consisting of a groove Gb and a land Lb in a zone k instead of the combined track A of the optical disc in the first embodiment of the present invention, and a combined track C consisting of a groove Gc and a land Lc in a zone k + 1. And the other configuration is the same.

No land prepits are formed on the land Lb of the combined track B and the land Lc of the combined track C, and no information is recorded on the groove Gb of the combined track B and the groove Gc of the combined track C. As described above, in the case of an optical disc having a narrow track width, the combined track B including the groove Gb and the land Lb is set in the zone k, and the groove Gc and the land L are set in the zone k + 1.
c, it is possible to form a combined track C composed of the land prepit p2 of the land L2 as compared with the first embodiment of the present invention.
The deterioration of the reproduction signals of the land prepits p31, p32 and p33 of the lands L3 and p22 and p23 can be more effectively prevented.

Next, land pre-pit signals recorded on the optical discs of the first and second embodiments of the present invention will be described. FIG. 5 is a diagram illustrating an example of a format configuration of a land pre-pit signal recorded on the optical disc according to each embodiment of the present invention. As shown in FIG. 5, the land pre-pit signal is modulated by a predetermined modulation method in a configuration in which a zone address 3, a block address 4, a flag 5 and an error correction code 6 are combined in a time-series manner. Is recorded in advance.

The zone address 3 is an address indicating which zone the zone is, and the block address 4 is
An address signal for identifying a recording block position in each segment. Flags 5 are combined track information,
Information necessary for driving the laser power, a serial number, and other various auxiliary information. Block address 4
The corresponding table information may be inserted so that the combined track can be detected based on The error correction code 6 is a code for correcting an error of the land pre-pit signal.

Next, a recording / reproducing apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram of a recording / reproducing apparatus according to the third embodiment of the present invention. The optical disk used here is the optical disk 1 described in the first embodiment of the present invention. On the optical disc 1,
As described with reference to FIG. 1, the pre-pit groups are alternately arranged in advance in the circumferential direction of the disk, and wobbles of the adjacent grooves have the same phase in the zone in two adjacent grooves in the radial direction of the disk. In this manner, a combined track A is formed at each zone boundary.

Recording / reproducing apparatus 7 according to a third embodiment of the present invention
Includes a spindle motor control drive circuit 8 for rotating the optical disk 1 via a spindle motor M, an optical pickup 10 for irradiating a laser beam to record input data on the optical disk 1 and reproducing data from the optical disk 1, and a laser. LD drive circuit 9 for driving and a photodetector 11 for receiving light reflected from the optical disk 1, an amplifier 12 for amplifying and outputting a reproduction signal from the photodetector 10, transmission line coding of input data, addition of an error correction code A signal processing circuit 13 for outputting after performing a recording format process, a pre-pit detecting circuit 14 for outputting as a land pre-pit signal corresponding to a groove being recorded / reproduced based on the reproduced signal amplified by the amplifier 12, Wobble detection circuit for outputting a wobble signal from the reproduction signal amplified by the amplifier 12 5, a wobble frequency phase synchronizing circuit 16 for outputting a wobble frequency synchronized with the pre-pit phase from the phase of the land pre-pit signal and the wobble signal from the wobble detection circuit 15; A combined track detection circuit 17 for detecting combined track information, a pre-pit decoding circuit 18 for adding combined track information to a land pre-pit signal output from the pre-pit detection circuit 14 and decoding a land pre-pit signal; Based on the decoded land pre-pit signal, the system controller 19 detects and outputs zone information and recording / reproduction control timing, and converts an information signal output from the signal processing circuit 13 into a predetermined format. After that, a recording (not shown) obtained by multiplying the wobble frequency is performed. Based on the recording and reproducing control timing from the lock and the system controller 19, the LD driving circuit 9, and recording the record signal in the groove of the optical disc 1 at a constant angular velocity method in each zone, and,
A recording / reproducing control circuit 20 for adding the combined track information to the reproduction signal amplified by the amplifier 12 and reproducing the recording signal from the groove of the optical disc 1.

The detection of the combined track A is performed as follows. The detection of the combined track A is recorded as land pre-pit information on the optical disk 1 as, for example, a flag 5 in a track one or more before the combined track, and transmitted to the system controller 19 as additional information by the pre-pit decoding circuit 17. This is obtained by performing a predetermined operation by the system controller 19. Alternatively, the system controller 19 may have a correspondence table based on the block address 4 so that the combined track A can be detected.

Recording and reproduction are performed as follows. First,
The recording will be described. Zone information output from system controller 19 and wobble frequency phase synchronization circuit 1
The wobble frequency output from 6 is input to the spindle motor control drive circuit 8 to control the rotation of the optical disk 1 via the spindle motor M. On the other hand, the signal processing circuit 13
The recording / reproduction control circuit 20 generates a recording signal based on the signal obtained by subjecting the input data input to the transmission line coding, the addition of the error correction code, and the recording format, to the wobble frequency and phase information from the wobble frequency phase synchronization circuit 16. Is output to the LD drive circuit 9 and recorded on the optical disk 1 using the optical pickup 11.

Next, reproduction will be described. The zone information output from the system controller 19 and the wobble frequency output from the wobble frequency phase synchronization circuit 16,
The phase information is input to the spindle motor control drive circuit 8 to control the rotation of the optical disc 1 via the spindle motor M. On the other hand, after the laser beam reflected from the optical disk 1 is received by the photodetector 10 of the optical pickup 11, the laser beam is amplified by the amplifier 12, and the reproduced signal output from the amplifier 12 is recorded / reproduced by the recording / reproduction control circuit 20, the pre-pit detection circuit 1
4 and the wobble detection circuit 15.

Further, after the land prepit signal is decoded by the prepit decoding circuit 17 and additional information is output, the zone information output from the system controller 19 and the wobble frequency output from the wobble frequency phase synchronization circuit 16 are recorded and reproduced. The recording / reproduction control circuit 20 outputs a reproduction signal to the signal processing circuit 13 based on the information signal and the wobble frequency. Thereafter, after performing processing such as demodulation and error correction from the signal processing circuit 13,
It is reproduced by an output device (not shown).

Here, the detection of the land pre-pit signal at the time of recording / reproducing the combined track A in the zone and each track other than this in the zone on the optical disc 1 will be described in detail with reference to FIG. FIG. 7 shows a land pre-pit signal detected in each track in the zone. FIG. 7A shows a land pre-pit signal detected in each track other than the combined track A in the zone. (B) is a diagram showing a land pre-pit signal detected in the combined track A in the zone.

As shown in FIG. 7 (a), when each groove of the track except for the combined track A in the zone is being reproduced, land prepits recorded on lands inside each groove are detected. Therefore, the land pre-pit signal has a negative polarity. On the other hand, FIG.
As shown in (b), when the groove Ga of the combined track A is being reproduced, no land prepit is formed on the land L3 adjacent thereto, so that a negative land prepit signal is not detected. . When recording is desired to be performed instantaneously in the groove G3, since the groove Ga does not have land pre-pits, the phase of the recording signal is not determined, and a delay occurs in the start of recording. Therefore, in this case, the polarity of the land prepit signal is switched to positive according to the combined track information output from the combined track detection circuit 17, and the land prepits p31 and p32 of the land L3 adjacent to the groove Ga of the combined track A are changed. , P33, and detect them as land pre-pit signals of the groove Ga. In this way, the phase information from the adjacent land pre-pits can be obtained even during the tracing of the combined track A, so that the recording start delay due to the zone switching can be prevented. Note that the polarity of the land pre-pits described here is an example, and may be set in reverse according to the arrangement of the land pre-pits corresponding to the wobble polarity in the groove.

As described above, the wobbles of the groove recorded in advance on the optical disk 1 are always in phase in the disk circumferential direction within the same zone, and the plurality of zones k,
at least one coupling track A including a groove Ga and a land La that does not form land prepits in one of the zones at the boundary of k + 1;
Since the groove Ga of the combined track A has the same phase as the period of the groove in the zone to which the combined track A belongs, crosstalk from an adjacent track at the zone boundary can be reduced, and the recording / reproducing signal quality can be improved. In addition, land pre-pit signals can be reproduced with high quality. When tracing the groove Ga of the combined track A,
The detection polarity of the land pre-pit is switched according to the connection track information output from the connection track detection circuit 17, and the land pre-pit of the land L3 of the next zone detected with the opposite polarity is adopted. For this reason, it is possible to prevent a recording start delay at the time of zone switching. Note that the same effect can be obtained by using the optical disk 2 of the second embodiment of the present invention instead of the optical disk 1.

The present invention is not limited to the above embodiment. For example, both sides of the groove shown in FIGS. 1 and 2 are continuously wobbled with a fixed period, but only one side of the groove is used. You may wobble. Further, one pre-pit group is constituted by three land pre-pits, but it goes without saying that the number of land pre-pits constituting one pre-pit group may be other than three. Further, in the second embodiment of the present invention, the number of combined tracks is two, but may be more.

[0042]

According to the present invention, each wobble of a groove previously recorded on an optical disk has the same phase in the circumferential direction of the disk in the same zone, and any one of the wobbles at the boundary of a plurality of zones. And at least one connecting track composed of a groove and a land on which no land pre-pits are formed, and the groove of this connecting track has the same period as that of the groove in the zone to which the connecting track belongs. Since the phase is a phase, crosstalk from an adjacent track at the zone boundary can be reduced, the quality of the recording / reproducing signal can be improved, and the land pre-pit signal can be reproduced with high quality. Further, when the groove groove of the combined track is traced, the polarity of the detection of the land pre-pit is switched and reproduced according to the combined track information output from the combined track means.
Recording start delay at the time of zone switching can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a zone boundary in an optical disc according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a state in which bit information is recorded in a groove of a combined track of the optical disc according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a state in which a total reflection portion is recorded in a groove of a combined track of the optical disc according to the first embodiment of the present invention.

FIG. 4 is an enlarged view of a zone boundary in an optical disc according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating a format configuration of an example of a land pre-pit signal recorded on the optical disc according to each embodiment of the present invention.

FIG. 6 is a block diagram of a recording / reproducing apparatus according to a third embodiment of the present invention.

FIGS. 7A and 7B show land pre-pit signals detected in each track in the zone, and FIG. 7A shows land pre-pit signals detected in each track other than the combined track A in the zone; And (b)
FIG. 4 is a diagram showing a land pre-pit signal detected in a combined track A in a zone.

FIG. 8 is a diagram conceptually showing a portion of a conventional optical disc where adjacent wobble phases have opposite phases.

FIG. 9 is a diagram showing a zone arrangement of an optical disc.

FIG. 10 is a diagram showing the states of grooves, lands, and prepits at the boundary between zone k and zone k + 1 on the optical disc disclosed in Japanese Patent Application No. 2000-060018.

FIG. 11 is a diagram showing a case where a combined track for converting a period is formed at a boundary where a zone k is switched to a zone k + 1.

[Explanation of symbols]

1, 2 optical disk, 3 zone address, 4 block address, 5 flags, 6 error correction code, 7 recording / reproducing device, 8 spindle motor control drive circuit, 9 ...
LD drive circuit, 10 photodetector, 11 optical pickup, 12 amplifier, 13 signal processing circuit, 14
Prepit detection circuit (prepit detection means), 15: wobble detection circuit (wobble detection means), 16: wobble frequency phase synchronization circuit (wobble frequency phase synchronization means),
17: combined track detection circuit (combined track detection means), 18: pre-pit decoding circuit (pre-pit decoding means), 19: system controller (system control means), 20: recording / reproduction control circuit (recording / reproduction control means), A, B ,
C: coupling track, G1, G2, G3, G4, Ga, G
b, Gc ... groove, L1, L2, L3, L4, La,
Lb, Lc ... Land

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D029 WA02 WA27 WC03 5D044 BC06 CC05 CC06 DE03 DE27 DE44 DE57 DE77 5D090 AA01 BB04 EE16 FF04 FF15 FF45 GG09 5D118 AA22 BA01 BB05 BC08 BC12 BD04 CD03

Claims (4)

[Claims] 1. An optical disk comprising: a groove formed concentrically or spirally from the innermost circumference to the outer circumference of an optical disc; and land portions continuously formed between the groove grooves. Has an information recording section in which auxiliary information used for recording an information signal in the groove is recorded in advance as land pre-pits, and the information recording section is divided into a plurality of zones in the disk radial direction in advance. In addition, one or both sides of the groove are continuously wobbled with a constant frequency in each zone of the plurality of zones by a constant angular velocity method, and in the zone, grooves adjacent to each other in a disk radial direction. An optical disc formed such that the phases of the wobbles of the grooves are always the same, and one of the zonals at the boundary between the plurality of zones is provided. At least one coupling track including the groove groove and the land on which the land pre-pits are not formed, and the groove groove of the coupling track has a groove groove in the zone to which the coupling track belongs. An optical disc characterized by having the same period and phase. 2. The optical disk according to claim 1, wherein at least one of a total reflection portion and previously formed pit information is recorded in a groove groove of said combined track. 3. An optical disk comprising: a groove formed concentrically or spirally from the innermost circumference to the outer circumference of an optical disc; and land portions continuously formed between the groove grooves. Has an information recording section in which auxiliary information used for recording an information signal in the groove is recorded in advance as land pre-pits, and the information recording section is divided into a plurality of zones in the disk radial direction in advance. In addition, one or both sides of the groove are continuously wobbled with a constant frequency in each zone of the plurality of zones by a constant angular velocity method, and in the zone, grooves adjacent to each other in a disk radial direction. The phase of each wobble of the groove is formed so as to always be in the same phase, and the groove is formed in one of the zones at the boundary of the plurality of zones. And at least one coupling track including the land that does not form the land pre-pits, and the groove groove of the coupling track has the same cycle and phase as the groove groove in the zone to which the coupling track belongs. What is claimed is: 1. A recording / reproducing apparatus for recording or reproducing information on / from an optical disc, comprising: prepit detecting means for detecting a land prepit signal from a reproduction signal of the optical disc; and wobble detecting means for detecting and outputting a wobble signal from a reproduction signal of the optical disc. Prepit decoding means for decoding the land prepit signal; wobble frequency phase synchronization means for outputting a wobble frequency synchronized with the prepit phase from the prepit phase from the prepit detection means and the wobble signal from the wobble detection means. And the decrypted land pre-pit And a combined track detecting means for detecting the combined track based on the input signal and outputting combined track information. 4. The pre-pit detecting means has output polarity corresponding to both positive and negative with respect to a detection reference level, and when a light spot traces the combined track, a polarity detected from a groove groove other than the combined track is determined. 4. The recording / reproducing apparatus according to claim 3, wherein a land pre-pit signal having an opposite polarity is detected and used for recording / reproducing control.