JPH09237473A - Disk-shaped information recording medium, optical disk and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a large recording capacity by enhancing a recording density and to eliminate a fear that an address part is erroneously detected by crosstalk from adjacent tracks. SOLUTION: In this continuous servo type optical disk in which a tracking control is performed by using per-grooves and information are recorded and reproduced by the clock of a single frequency in a state where an angular velocity is constant, tracks TRs consisting of data parts DAIAs where data are recorded and address parts ADRs where the recording and reproducing management information of the data are recorded are spirally formed. Moreover, both of a land part and a groove part are used as recording and reproducing tracks TRs and odd numbered tracks TRs are formed in the land part and even numbered tracks TRs are formed in the groove part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped information recording medium, an optical disc and an optical disc device for optically recording / reproducing information.

[0002]

2. Description of the Related Art In an optical disc system for recording / reproducing various data by scanning a recording / reproducing track on a recording surface with a laser beam, an optical disc has a constant linear velocity (CLV: Constan
t Linear Velocity), the CLV system that records / plays back and forth data, and the optical disk has a constant angular velocity (CAV: C
CAV method for recording / reproducing data by rotationally driving the onstant angular velocity), and MCAV (Modified CAV) method for increasing the recording efficiency by making the spatial recording density almost constant on the inner and outer circumferences of the disc. Are known.

Conventionally, in an optical disc, either a land portion or a groove portion formed concentrically or spirally on a recording surface is used as a recording / reproducing track, and as shown in FIG. The land portion formed in a spiral shape is used as the recording / reproducing track TR.

Further, there is a continuous servo system for performing tracking control or the like by using pregrooves continuously provided along the track, or tracking control or the like by utilizing servo areas discretely provided on the track. A known sample servo method is known. In the above continuous servo system, the optical phase difference between the land portion and the groove portion is used to track the land portion, and information is recorded / reproduced on the land portion, that is, the recording / reproducing track.

On the recording / reproducing track, there is provided an address section in which management information for recording / reproducing data is recorded.

[0006] Here, the International Standardization Organization (ISO)
FIG. 14 shows the structure of the address section of an optical disk of the continuous servo system defined by Al Organization for Standardization).

In the structure of the address part shown in FIG. 14, the VFO locks a phase locked loop (PLL) of a clock recovery system to extract a clock for recovering the address information, and thus phase information. It is a clock pull-in signal containing a lot of. AM
Is a synchronizing signal that is timed to reproduce the address information. The ID is the actual address information including the error detection code. Note that the address part may be composed of a plurality of the above sets, and is triple-recorded in the example of FIG. Further, a signal SM indicating the beginning of the address part may be added in advance.

Further, as the optical disk, a recordable RAM disk such as a so-called ROM disk dedicated to reproduction, a write-once disk, a magneto-optical (MO) disk, a ROM area and an R area.
A so-called hybrid disc having an AM area is known.

[0009]

By the way, if the track pitch is narrowed to increase the density in the radial direction in order to cope with the increase in the capacity of the disk, crosstalk between tracks becomes a problem, especially due to preformatting. The embossed pits have a large influence on the adjacent track, and the influence from the address part recorded as the embossed pit by the preformat to the data part or the address part of the adjacent track becomes a problem.

Further, as a method for coping with the increase in capacity of the disc, it is possible to optimize the physical conditions of the land portion and the groove portion on the recording surface and use the land portion and the groove portion as recording / reproducing tracks respectively. Conceivable.

Therefore, in view of the conventional situation as described above, it is an object of the present invention to provide a disc-shaped information recording medium in which the address portion is not likely to be erroneously detected by crosstalk from an adjacent track.

Another object of the present invention is to provide a disc-shaped information recording medium capable of increasing the recording density and ensuring a large recording capacity.

Another object of the present invention is to provide a disc-shaped information recording medium in which the land portion and the groove portion are used as tracks to ensure the continuity of the tracks.

Still another object of the present invention is to provide an optical disk and an optical disk device which can easily perform address reproduction and tracking polarity switching in a reproduction system.

[0015]

DISCLOSURE OF THE INVENTION The present invention provides a disc-shaped information recording medium in which a groove is formed and information is recorded / reproduced on / from a track of a land portion and a groove portion,
It is characterized in that it is provided with an address portion having address information previously formed in a predetermined cycle with respect to the track, and the address portions are sequentially arranged in the radial direction so as to be displaced in the track direction.

In the disc-shaped information recording medium according to the present invention, for example, the land portion and the groove portion are switched an odd number of times in one round.

The disc-shaped information recording medium according to the present invention has, for example, the address portion arranged at a switching position between the land portion and the groove portion.

The present invention is a disk-shaped information recording medium in which a groove is formed and information is recorded / reproduced on / from a land portion and a track of the groove portion, wherein the land portion and the groove portion are formed an odd number of times per revolution. Switching and switching positions are formed in the radial direction in at least one or more zones in the radial direction, the address portion is formed at the switching position between the land portion and the groove portion, and the first address information portion is formed in the address portion. And a second address information section, the first,
The second address information portions are formed at predetermined intervals in the radial direction in the zone and are formed so as to be offset from each other in the radial direction.

The present invention is based on an optical head for recording / reproducing information on / from the optical disc in an optical disc apparatus for recording / reproducing information on / from a land portion and a groove portion of the optical disc, and a signal from the optical head. hand,
Based on signals from the address information detecting means for detecting address information formed on the optical disk in a predetermined cycle, the tracking servo means for performing tracking servo with respect to the optical head, and the signal from the address information detecting means. Means for giving a signal for switching the tracking polarity to the tracking servo means.

[0020]

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

The disc-shaped information recording medium according to the present invention is constructed, for example, as shown in FIG. The disc-shaped information recording medium shown in FIG. 1 is an optical disc having a pre-groove for tracking control, and has a data portion DATA in which data is recorded and an address portion ADR in which management information for recording / reproducing the data is recorded. And are formed in a spiral shape in a predetermined cycle. In this disc-shaped information recording medium, both the groove portion and the land portion are recording / reproducing tracks TR.
_Is used as, for example, an odd track TR _odd
Are formed in the land portion, and the even-numbered tracks TR _even are formed in the groove portion. In this disc-shaped information recording medium,
Both the groove portion and the land portion are recording / reproducing tracks T.
By using as R, an optical disc having a high recording density and a large recording capacity is realized.

In this disc-shaped information recording medium, the address portion ADR1 corresponding to the _odd number track TR _odd and the address portion ADR2 corresponding to the even number track TR _even are arranged at positions displaced from each other in the circumferential direction.

In the address parts ADR1 and ADR2,
In order to extract the clock for reproducing the address information, the phase-locked loop (PLL: Phas
e locked loop), a clock pull-in signal VFO containing a lot of phase information, a synchronization signal AM that takes timing to reproduce address information, an actual address information ID including an error detection code, etc. Will be recorded.

[0024] In general the modulation method, but there is a fear pit in the address of the track on both sides is to be erroneously detected by the various values crosstalk since taking the address portion ADR1 and even on the way odd track TR _odd Truck TR
_By arranging the address portions ADR2 on the evens in different radial directions, there is no risk of erroneous detection due to crosstalk.

In the above example, the odd track TR _odd
Address section ADR1 and even track TR _even corresponding to
The address portions ADR2 corresponding to are arranged at positions displaced from each other in the circumferential direction, and as shown in FIG.
Although they are aligned in the radial direction as a whole, the address parts ADR1 and ADR2 do not necessarily have to be adjacent to each other.

Further, as shown in FIG. 3, the address portion ADR1 corresponding to the _odd number track TR _odd and the address portion ADR2 corresponding to the even number track TR _even have the same signal, for example, a signal which does not cause a crosstalk between adjacent tracks. The clock pull-in signal VFO and the sync signal AM are aligned in the radial direction, and the address information I has a different value for each track.
D _{od d,} ID _even in not aligned radially crosstalk becomes an issue, it may be recorded by shifting in the track direction.

Further, as shown in FIG. 4, the clock pull-in signal VFO is aligned in the radial direction, and the address information ID _odd and ID _even having different values for each track are the synchronization signal A.
The recording may be performed by shifting in the track direction together with M _odd and AM _even . The synchronization signals AM _odd , AM
_{The even} patterns are different from each other.

Further, in a disc-shaped information recording medium in which both the groove portion and the land portion are used as recording / reproducing tracks TR to increase the recording density, for example, as shown in FIGS. And replace the land part,
By cutting beforehand, the continuity of the track can be secured.

An address portion ADR1 is provided adjacent to the groove portion at a portion changing from the land portion to the groove portion, and an address portion ADR2 is provided adjacent to the land portion at a portion changing from the groove portion to the land portion. The address information of the address part ADR1 is used in the odd track TR _odd that changes from the land part to the groove part, and the address information of the address part ADR2 is used in the even track TR _even that changes from the groove part to the land part.

Here, the synchronization signals AM _odd and AM _{even in the} address portion ADR1 and the address portion ADR2.
By setting the patterns different from each other, it is possible to perform address reproduction and switching of tracking polarities even if timing management is not performed.

Further, it is not necessary to replace the groove portion and the land portion once per revolution. For example, as shown in FIG. 7, an example of three revolutions per revolution is performed once per revolution. If so, the continuity of the truck can be secured.

Further, in the disc-shaped information recording medium adopting the MCAV (Modified CAV) system, which is divided into a plurality of zones so that the spatial recording density is substantially constant on the inner and outer circumferences of the disc to improve the recording efficiency, The number of addresses, the position, the number of times the groove portion and the land portion are replaced and the position are changed for each round.

In the recording / reproducing system of the disc-shaped information recording medium shown in FIG. 1, it is not allowed to record in the wrong sector (position) or reproduce data other than the desired one, but recording / reproducing Since it is known in advance whether the target sector is on the land portion or the groove portion, the address portion ADR1 and the address portion ADR2 are selected depending on whether the target sector is on the land portion or the groove portion. Play it. Addresses that cannot be accurately reproduced due to a large amount of crosstalk need not be reproduced, and only the required address part may be reproduced.

When tracking is applied to the groove portion, if the address information ADR2 is directly entered, the tracking information is changed from the on-pit state to the on-groove state, and the address portion ADR2 can be reproduced. Therefore, the address part ADR2 is used as information. Further, when tracking is applied to the groove portion, if the information directly enters the address portion ADR1, the tracking information changes from the on-pit state to the on-land state, and the address portion ADR1 is a signal due to crosstalk components from both sides that cannot be reproduced. is there. Therefore, the address part ADR
The information of 1 is not used.

If address reproduction is performed for the purpose of knowing the current position in order to seek to the target address, 1
Since there is no problem even if there is an error of about a track, it is only necessary to perform reproduction without paying attention to the address portion ADR1 and the address portion ADR2, and use address information at a reproducible portion.

In general, in order to increase the detection probability of an address error, a detection code or the like is included in the address information. Therefore, when the address is reproduced, the above-mentioned detection code or the like is used to detect an error so that there is no error. Address part ADR1, AD
It is possible to use only the information of R2. For example, on the land portion, the address portion ADR2 reproduces an erroneous signal due to the influence of crosstalk, and the address portion ADR1
Since this is an on-track, it is reproduced normally, and an error is detected in the information of the address part ADR2 by error detection, but the information of the address part ADR1 is normally detected by error detection. Department AD
The information of R1 is used. Even in such a case, if strict position information is required, tracking may be performed for reproduction. Further, as in the case of recording and reproducing, the address portion ADR1 and the address portion ADR2 may be selected and reproduced depending on whether they are on the land portion or the groove portion.

When tracking is performed on the land portion, when the address portion ADR1 is entered, the address pit can be tracked by switching the tracking polarity to reproduce the address portion ADR1. After that, by returning the tracking polarity to the original value, the data recording / reproducing can be normally performed in the subsequent data portion DATA.

Here, recording / reproduction of the data portion DATA on the land portion will be described.

Since the land portion is tracked, the reproduced RF signal is as shown in FIG. In a read-only ROM disk, a phase-change type optical disk that detects data by a reflected light amount difference, or a dye-based optical disk, some signal may appear in the data section DATA. In the address section 1, address information due to crosstalk from adjacent tracks leaks in.

CRC is error detection, and the error detection code in the address information is used. P in address part
When the LL is locked and the sync signal is detected, error detection is performed while reproducing the address information. The error is also terminated at the end of the address information (CRC = Hi). Therefore, even if there is a reproduction signal in the data part DATA, CRC does not become Hi. In the address part 2, since it is difficult to obtain correct data due to the influence of the adjacent track, it is unlikely that CRC = Hi. Since the reproduced signal of correct data is naturally obtained in the address portion ADR1, CRC = Hi.

FIG. 9 shows a structural example of an optical disk recording / reproducing apparatus for recording / reproducing data on / from the optical disk 10 which is the disk-shaped recording medium having the above-mentioned structure.

In this optical disk recording / reproducing apparatus, the spindle motor 11 is controlled by the control circuit 19 to rotate the optical disk 10 at a predetermined speed. Further, the optical head 12 irradiates the optical disc 10 with laser light,
Data is recorded on the optical disc 10 and data is reproduced from the reflected light. The tracking servo circuit 13 also generates a tracking error signal based on, for example, the push-pull method, and is controlled by the control circuit 19 in response to the tracking error signal to drive the optical head 12. Further, the focus circuit 14 generates a focus error signal based on, for example, the astigmatism method, and the control circuit 19 corresponding to the focus error signal.
The objective lens (not shown) of the optical head 12 is driven.

Further, the recording / reproducing circuit 15 modulates the recording data input from the controller 16 and outputs it to the optical head 12 and outputs the reproducing data output from the optical head 12 to the controller 16.

The address reproducing circuit 17 includes the optical head 12
The address information included in the data reproduced by is output to the read timing generation circuit 18 and the control circuit 19. The timing generation circuit 18 is, for example, a circuit that takes timing within a track and is initialized by an address detection signal (address information) from the address reproduction circuit 17. This initialization enables prediction of the next address position, for example. Further, the timing generation circuit 18 operates with the reference clock, unlike the address reproduction circuit 17. Further, the timing generation circuit 18 outputs a polarity switching signal to the tracking servo circuit 13.

The sled motor 20 has a control circuit 1
Controlled by 9, the optical head 12 is moved to a predetermined track position on the optical disk 10.

FIG. 10 shows the address reproducing circuit 1 shown in FIG.
It is a block diagram which shows the detail of 7.

In the address reproducing circuit 17 shown in the block diagram of FIG. 10, the reproduced RF signal is supplied to the serial / parallel conversion register 102 via the sampling circuit 101, and the output of this register 102 is output to the address register 1.
03.

The sampling circuit 101 has a fetch signal CR.
The reproduction RF signal is extracted by COK (CRC = Hi) and supplied to the serial / parallel conversion register 102. Then, the data stored in the register 102 is taken into the address register 103 as address information with CRC = Hi.

A control signal EN is output from the timing generation circuit 18 with a margin at the position where an error is detected.
The capture signal CRCOK (CR to the address register 103 via the gate circuit 104 controlled by
By gating C = Hi), the address information taken into the address register 103 is made accurate.

A specific example of tracking at the time of reproducing address information will be described.

For example, the S-shaped curve of the tracking error signal corresponding to the locus of the pickup when recording / reproducing data to / from the data part DATA on the land part is shown in FIG.
As shown in, data part DATA and address part A
The S-curve of the tracking error signal is opposite to that of DR1. In order to apply tracking, it suffices to match the 0 cross of the S-shaped curve, but it is necessary to reverse the drive direction. In the address part ADR1, as shown in FIG.
The tracking error signal obtained via 02 is switched in polarity by the polarity switching circuit 203 in the tracking servo circuit 13 and supplied to the drive circuit 204. The polarity switching signal is output from the timing generation circuit 18, but the timing from the sampling circuit 101 may be used for the stability of the servo. In the sampling circuit 101, the reproduction end timing of the address part ADR2 is actually obtained accurately, not the managed rough timing, and therefore the polarity is switched immediately after the end of reproduction of the address part ADR2. Similarly, the polarity can be returned immediately after the reproduction of the address portion ADR1 is completed.

In the disc-shaped information recording medium in which the land portion and the groove portion are switched on the same tracking and the address portion ADR is arranged at the switching position, it is not necessary to return the polarity immediately after the reproduction of the address portion ADR1. Try to maintain the same polarity.

Further, in the disc-shaped information recording medium in which the synchronizing signals AM _odd and AM _even in the address portion ADR1 and the address portion ADR2 are different patterns from each other,
For example, when recording and reproducing data on the land part,
The address part ADR1 is used. That is, the synchronization signal AM
Start by detecting _{odd numbers} . The synchronization signal AM _odd is
It is a unique pattern for the address part ADR1,
It is not detected by the address part ADR2. Therefore,
The address portion ADR2 does not perform extraction. Specifically, no error detection is performed. Therefore, the address part A
Even if a reproduction signal is obtained in DR2, CRC = Hi does not occur and the address information is not loaded into the address register. Eventually, the information of the desired address part ADR1 is loaded into the address register.

When recording / reproducing data to / from the groove portion, the address portion ADR2 is used. That is, it starts by detecting the synchronization signal AM _even . The synchronization signal AM _even is a unique pattern for the address part ADR2 and is not detected by the address part ADR1. Therefore, the address portion ADR1 is not extracted. Specifically, no error detection is performed. Therefore, even if a reproduction signal is obtained in the address part ADR1,
CRC = Hi does not occur and address information is not loaded into the address register. Eventually, the information of the desired address part ADR2 is loaded into the address register.

Further, other than during recording / reproducing, for example, if the user wants to know the current track position before seek, if he wants to know the rough position such as checking the track reached after seek, or if tracking is not performed. If it is desired to know the position without needing to read the address parts, both the address parts ADR1 and ADR2 may be read without limitation.
That is, the sync signals AM _odd and AM _even may be detected.

The address parts ADR1 and ADR2 are
Recording may be performed with a 1/2 pitch shift with respect to the groove and land, respectively.

[0057]

In the disk-shaped information recording medium according to the present invention, the address portions having the address information preformed at a predetermined cycle with respect to the tracks of the land portion and the groove portion are sequentially displaced in the radial direction in the track direction. Since it is provided, there is no risk of erroneous detection due to crosstalk. Further, in the disc-shaped information recording medium according to the present invention, since the tracks are formed in the land portion and the groove portion, it is possible to increase the recording density and secure a large recording capacity. Further, in the disc-shaped information recording medium according to the present invention, track continuity can be ensured by switching the land portion and the groove portion on the track an odd number of times in one round. Further, according to the present invention, by disposing the address portion at the switching position between the land portion and the groove portion, it is possible to provide a disc-shaped information recording medium in which the address reproduction and the tracking polarity can be easily switched in the reproducing system. it can.

Further, in the optical disc according to the present invention, the land portion and the groove portion for recording / reproducing information are switched odd number of times in one round, and the switching positions are aligned in the radial direction in at least one zone in the radial direction. The address portion is formed at a switching position between the land portion and the groove portion, and the address portion has a first address information portion and a second address information portion, and first and second address information portions. Are formed at predetermined intervals in the radial direction in the zone and are displaced from each other in the radial direction, the address information can be reliably provided.

Further, in the optical disk device according to the present invention, the address information formed on the optical disk in a predetermined cycle is detected by the address information detecting means on the basis of the signal from the optical head, and the tracking servo means performs tracking. By switching the polarity, stable tracking servo is applied to the optical head,
Information can be recorded / reproduced on / from the land portion and the groove portion of the optical disc by the optical head.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing an essential configuration of a disc-shaped information recording medium according to the present invention.

FIG. 2 is a plan view schematically showing the arrangement of address parts on odd tracks and address parts on even tracks in the disc-shaped information recording medium.

FIG. 3 is a diagram for explaining an example of recorded contents of each address part.

FIG. 4 is a diagram for explaining another example of the recorded contents of each address part.

FIG. 5 is a diagram showing a part where the groove part and the land part of the disc-shaped information recording medium, which are used as continuous recording and reproducing tracks by replacing the groove part and the land part once, are replaced with each other.

FIG. 6 is a diagram showing a disc-shaped information recording medium in which a groove portion and a land portion are exchanged once per revolution and used as continuous recording / reproducing tracks.

FIG. 7 is a diagram showing a disc-shaped information recording medium in which a groove portion and a land portion are replaced three times in a circle and used as continuous recording / reproducing tracks.

FIG. 8 is a time chart for explaining recording / reproduction with respect to a data section on a land section.

FIG. 9 is a block diagram showing a schematic configuration of an optical disc recording / reproducing apparatus for recording / reproducing data on / from a disc-shaped information recording medium according to the present invention.

FIG. 10 is a block diagram showing a configuration of an address processing circuit in the optical disc recording / reproducing apparatus.

FIG. 11 is a diagram showing an S-shaped curve of a tracking error signal corresponding to a locus of a pickup when recording / reproducing data to / from a data portion on a land portion.

FIG. 12 is a block diagram showing a circuit configuration for switching the polarity of the tracking drive.

FIG. 13 is a diagram showing recording / reproducing tracks on a general optical disc.

FIG. 14 is a diagram schematically showing a configuration of an address section of an optical disc of a continuous servo system defined by ISO.

[Explanation of Codes] DATA data part, ADR1, ADR2 address part, 10 optical disk, 11 spindle motor, 12
Optical head, 13 Tracking servo circuit, 15
Recording / reproducing circuit, 16 controller, 17 address reproducing circuit, 18 timing generation circuit, 19 control circuit

Claims (5)

[Claims] 1. A disc-shaped information recording medium in which a groove is formed and information is recorded / reproduced on / from a track of a land portion and a groove portion, and address information preformed in a predetermined cycle on the track. A disc-shaped information recording medium, comprising: an address section having a plurality of address sections, wherein the address sections are sequentially arranged in the radial direction so as to be displaced in the track direction. 2. The disc-shaped information recording medium according to claim 1, wherein the land portion and the groove portion are switched an odd number of times in one round. 3. The disc-shaped information recording medium according to claim 2, wherein the address portion is arranged at a switching position between the land portion and the groove portion. 4. An optical disc in which a groove is formed and information is recorded / reproduced on / from a land portion and a track of the groove portion, wherein the land portion and the groove portion are switched an odd number of times in one round.
Further, the switching positions are formed in the radial direction in at least one or more zones in the radial direction, the address parts are formed at the switching positions of the land part and the groove part, and the first address information part and the first address information part are formed in the address part. An optical disc having two address information parts, wherein the first and second address information parts are formed at predetermined intervals in the radial direction in the zone and are displaced from each other in the radial direction. . 5. An optical disk device for recording / reproducing information on / from a land portion and a groove portion of an optical disc, wherein an optical head for recording / reproducing information on / from the optical disc, and a signal from the optical head Based on signals from the address information detecting means for detecting address information formed on the optical disc in a predetermined cycle, tracking servo means for performing tracking servo with respect to the optical head, and the signal from the address information detecting means. An optical disk device comprising: a means for applying a signal for switching tracking polarity to the tracking servo means.