JP2002175667A - Information recording medium, information reproducing device and address reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a read error of an address signal by crosstalks between adjacent tracks of a disk narrowed in track pitch with simple constitution. SOLUTION: Lands (L1, etc.), and grooves (G1, etc.), which are recording tracks for recording information are adjacently disposed at a magneto-optical disk 1. Address marks AM which are synchronizing signals, land identification signals LID or groove identification signals GID as track identification signals arranged near the synchronizing signals (AM) and address signals ADR indicating the position information determined of the read timing by the synchronizing signals described above are previously recorded and formed by rugged pits, etc., in these recording tracks (lands L1, grooves G1, etc.). In reproducing the address signals, the synchronizing signals (AM) and the track identification signals (LID or GID) are detected in combination and the addresses are read in accordance with the detected synchronizing signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium, an information reproducing apparatus, and an address reproducing method, and more particularly, to an optical disk having a narrow track pitch and a multilayer structure in order to increase the capacity of the information recording medium. And the like, an information recording medium, an information reproducing apparatus, and an address reproducing method.

[0002]

2. Description of the Related Art In order to increase the capacity of an information recording medium such as an optical disk, a narrow track pitch and a multilayer structure have been attempted.

In other words, narrowing the track pitch means increasing the density of recording tracks on a medium (narrowing track intervals).
The multilayering means increasing the capacity of the entire medium by superimposing a plurality of recording layers and recording information on each recording layer.

[0004]

In an information recording medium such as an optical disk having a narrow track pitch and a multilayer structure as described above, an address signal of an adjacent recording track or an address signal of an adjacent recording layer is used. However, it becomes easier to see as crosstalk.

As described above, when an address signal of an adjacent recording track or an adjacent recording layer is reproduced as crosstalk, an address signal different from an original address signal is read, and a correct address position is determined. It cannot be detected. If the correct address location cannot be detected,
Recording and reproduction at the correct position cannot be performed. Also, if only the synchronization signal included in the adjacent address is detected, the address decode circuit will operate unnecessarily, and the operation will be the same as if an error was read but an error occurred. .

Further, when reproducing a disk-shaped recording medium having a narrow track pitch, disturbances are applied to the disk reproducing apparatus, and if the pickup becomes difficult to accurately scan the track, the above-mentioned disadvantages appear more remarkably. become.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has been made in view of the above circumstances, and has been made in view of the foregoing circumstances. Media, information reproducing device,
And an address reproduction method.

[0008]

In order to solve the above-mentioned problems, an information recording medium according to the present invention is an information recording medium in which recording tracks for recording information are arranged adjacently. A synchronization signal, a track identification signal disposed near the synchronization signal, and an address signal indicating read timing determined by the synchronization signal and representing position information are recorded in the recording track in advance. .

According to another aspect of the present invention, there is provided an information reproducing apparatus for reproducing an information recording medium on which a recording track for recording information is arranged adjacently. In the recording track of the medium, a synchronization signal, a track identification signal arranged near the synchronization signal, and an address signal indicating position information whose read timing is determined by the synchronization signal are recorded in advance. When the address signal is reproduced, a reproducing means for detecting the synchronization signal and the track identification signal together and reproducing the address signal based on the detected synchronization signal is provided.

In order to solve the above-mentioned problems, an address reproduction method according to the present invention provides an address signal recorded in advance on an information recording medium on an information recording medium on which recording tracks for recording information are arranged. In the address reproducing method for reproducing the information, the recording track of the information recording medium is provided with a synchronization signal, a track identification signal arranged near the synchronization signal, and a read timing determined by the synchronization signal to indicate position information. The address signal is recorded in advance, and when reproducing the address signal,
The synchronous signal and the track identification signal are detected together, and the address signal is reproduced based on the detected synchronous signal.

Here, the track identification signal is for identifying an adjacent recording track, and may be arranged in the vicinity of the synchronization signal. Further, an error detection code or an error correction code may be applied to the track identification signal and the address signal.

According to another aspect of the present invention, there is provided an information recording medium having a plurality of recording layers on which recording tracks for recording information are arranged. Is characterized in that a synchronizing signal, a recording layer identification signal arranged near the synchronizing signal, and an address signal indicating position information determined by a reading timing by the synchronizing signal are recorded in advance.

In order to solve the above-mentioned problems, an information reproducing apparatus according to the present invention reproduces an information recording medium having a plurality of recording layers on which recording tracks for recording information are arranged. In the recording track, a synchronization signal, a recording layer identification signal disposed in the vicinity of the synchronization signal, and an address signal indicating position information determined read timing by the synchronization signal is recorded in advance, When the address signal is reproduced, a reproducing means for detecting the synchronization signal and the recording layer identification signal together and reproducing the address signal based on the detected synchronization signal is provided.

[0014] The address reproducing method according to the present invention comprises:
In order to solve the above-mentioned problems, in an address reproducing method for reproducing an address signal previously recorded on the recording track in an information recording medium having a plurality of recording layers on which recording tracks for recording information are arranged, In the recording track of the information recording medium, a synchronizing signal, a recording layer identification signal arranged near the synchronizing signal, and an address signal indicating read timing determined by the synchronizing signal and indicating position information are recorded in advance. In reproducing the address signal, the synchronous signal and the recording layer identification signal are detected together, and the address signal is reproduced based on the detected synchronous signal.

Here, the recording layer identification signal may be arranged near the synchronization signal, and an error detection code or an error correction code may be used for the recording layer identification signal and the address signal. Is applied.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an information recording medium, an information recording / reproducing apparatus and a synchronization detecting method according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing an example of an information recording medium according to an embodiment of the present invention.

In FIG. 1, as an information recording medium according to an embodiment of the present invention, for example, a magneto-optical disk 1 is assumed, and the magneto-optical disk 1 has a recording track for recording information. They are arranged radially adjacent. In the recording track, a synchronization signal, a track identification signal arranged near the synchronization signal, and an address signal indicating read timing determined by the synchronization signal and indicating position information are recorded in advance. In the example of FIG. 2, a so-called land / groove recording format in which information is recorded using both lands and grooves as recording tracks is adopted.

FIG. 1A shows, on an enlarged scale, a portion where the groove G0, land L1, and groove G1 are arranged adjacently on the magneto-optical disk 1. The groove G0 has a recording data area. Address area G corresponding to GD01
A01, an address area GA02 corresponding to the recording data area GD02, etc. are recorded and formed in advance, and an address area LA1 corresponding to the recording data area LD11 is formed on the land L1.
1. Address area L corresponding to recording data area LD12
A12 and the like are recorded and formed in advance, and an address area GA11 corresponding to the recording data area GD11,
Address area GA1 corresponding to recording data area GD12
2 etc. are recorded and formed in advance. The address area of the groove and the address area of the land are displaced along the head scanning direction or the disk rotation direction, which is the scanning direction of the light beam spot, so that the positions in the scanning direction do not overlap. I have.

These address areas LA11, GA11
For example, the address area information, which is information recorded and formed in advance by, for example, pits (so-called pre-pits) having physical unevenness, has a configuration as shown in FIG. 1B, for example. In FIG. 1B, the address area information is composed of, for example, a total of 60 bits. From the top, VFO (16 bits) which is a PLL pull-in pattern and an address which is a synchronization signal for determining the position of the address area. A mark AM (3 bits), a track identification signal LID or GID (1 bit) for identifying between adjacent tracks, and an address ADR (24 bits) for specifying a recording data area provided continuously to the address area ) And an error detection code CRC (16 bits). In the track identification signal, LID indicates a land identification signal, and GID indicates a groove identification signal.

The data in the address area (address area information) is modulated by, for example, a bi-phase modulation method as shown in FIG. That is, 1-bit data before bi-phase modulation is converted into two channel bits (ch bi
The data "0" before modulation is converted to "11" or "00" after modulation, and the data "1" before modulation is converted to "10" or "01" after modulation, respectively. Is done.
In the data division before modulation, the modulation signal is always inverted. Therefore, when the immediately preceding modulation signal is “0”, the modulation signal starts from “1”, and when the immediately preceding modulation signal is “1”. Sometimes the modulation signal starts from "0". Here, for example, the land identification signal LID in the track identification signal is represented by “11” corresponding to data “0” before modulation, and the groove identification signal GID is “11” corresponding to data “1” before modulation. 10 ".

FIG. 1C shows pits having physical irregularities recorded and formed on the magneto-optical disk 1. The modulation signal "1" has a pit, and "0" has no pit. Respectively. FIG. 1D shows a reproduced signal waveform by these pits.

As is apparent from FIGS. 1C and 1D, the VFO of 32 channel bits is "1", "0".
The address mark AM following this is
It is “111000”. This is because "1" and "0" appear only twice at a maximum in a bi-phase modulated signal pattern, so that the address mark AM serving as a synchronization signal is "1" outside the modulation rule. , “0” are continuous patterns “111” of three channel bits each.
000 "is used to recognize where the head of the data area is based on this pattern. Following this address mark AM, a land identification signal LID or a groove identification signal GID is provided as a track identification signal. In this case, the address mark AM and the track identification signal may be regarded as an expanded or broadly-defined synchronizing signal portion, and in this case, the main part of the expanded synchronizing signal portion of the address mark AM, the track identification signal is used. The track identification signal may be placed before or after the address mark AM.

FIG. 3 is a block diagram showing a schematic configuration of a magneto-optical disk drive to which the embodiment of the present invention is applied.

In FIG. 3, the magneto-optical disk 1 is
The motor is rotationally driven by a spindle motor 2a, and is controlled by a spindle servo circuit 2b so as to maintain a specified number of rotations (rotation speed). The position of the pickup 3 is controlled by a servo circuit 4 so that recording and reproduction can be performed at a predetermined position. The laser beam emitted from the pickup 3 is applied to the magneto-optical disk 1 and the return light thereof is received. ing. An external magnetic field generating coil 5 is arranged at a position on the extension of the laser beam opposite to the disk. The laser light emitted from the pickup 3 is controlled by a laser power control circuit 6 to have a predetermined power.

The pickup 3 converts the address area information recorded on the magneto-optical disk 1 as pits having irregularities as described above, for example, into a light intensity signal (PIT RF signal).
And the signal is input to the address signal decoding circuit 7. In the address signal decoding circuit 7, the light intensity signal (PIT) from the pickup 3 is given by the track selection signal of the track at the target position given from the controller 8.
The track identification signal in the address area information of the (RF signal) is determined so that a false address due to crosstalk of a track adjacent to the target address is not read. As described above, the address signal decoding circuit 7 reads only the address information on the track at the target position,
A sector address or the like recorded on the disk is decoded, and an address position pulse (synchronization detection pulse) and address data are sent to the controller 8. Thus, the controller 8 commands the servo circuit 4 to control and move the pickup 3 to a desired position on the disk.

In the magneto-optical disk drive device shown in FIG. 3, the data flow and operation when data is normally recorded and reproduced will be briefly described.

The recording data is first subjected to an appropriate modulation, for example, an EFM plus modulation used in a so-called DVD (Digital Versatile Disk) when recorded on an optical disk by the modulation circuit 10. These modulated data are input to the magnet drive circuit 11, and the external magnetic field generating coil 5 outputs +,
A negative recording magnetic field is generated. At the same time, the controller 8 sets the power to the laser power control circuit 6 so that the laser has the recording power. As a result, a recording mark corresponding to the polarity of the external magnetic field is formed on the disk.

When data is reproduced from the formed recording marks, first, the controller 8 moves the pickup 3 to a desired address position based on the address data output from the address signal demodulation circuit 7. The magneto-optical signal (MORF signal) of the address to be reproduced is reproduced. As the reproduced MORF signal, information recorded by the MO signal demodulation circuit 9 is reproduced.

As described above, in the optical disk recording / reproducing system, the position on the disk where the data is to be recorded and the position where the data is to be reproduced are determined by the address data of the address area information recorded on the magneto-optical disk 1 in advance. It is based on.

Next, a description will be given of a procedure for reproducing address data of the address area information in the case of using a magneto-optical disk in which the address area information described in conjunction with FIG. 1 is recorded and formed in advance.

FIG. 4 shows a configuration example of the address signal demodulation circuit 7 in FIG. In FIG. 4, first, binarized data and a clock are reproduced by the binarization circuit 21 from the PIT RF signal reproduced from the disc,
It is supplied to an M detection circuit 22, a track identification data detection circuit 23, and an address data decode circuit 25. The AM detection circuit 22 calculates the AM pattern (111000) described above.
Is a circuit that outputs an AM detection pulse when the signal is detected. The track identification data detection circuit 23 is a circuit that outputs a track identification data detection pulse when the track identification signal selected by the track selection signal is detected. When both of these detection signals are detected, the AND circuit 24
Outputs a synchronization detection pulse, which is sent to the address data decoding circuit 25. Address data decode circuit 2
3 demodulates the data of the binary data from the binary circuit 21 with this synchronization detection pulse as a time reference, performs a CRC check, and outputs an address position pulse and address data. Send to 8. Note that CR
If the C check code is applied not only to the address data but also to the track selection signal, the reliability of track identification is further improved.

FIG. 5 shows a specific configuration example of the AM detection circuit 22, the track identification data detection circuit 23, and the AND circuit 24. In FIG. 5, the binarized data B from the binarizing circuit 21 shown in FIG. 4 is used as a D-type flip-flop (D-FF) 23 of the track identification detecting circuit 23.
a, 23b. This D-FF 23a, 23b
Constitutes an 8-bit shift register together with the D-FFs 22a to 22f of the AM detection circuit 22, and is driven by a channel clock A. D-FF 23a, 2
3b is sent to an AND circuit 23c, and
The output from the circuit 23c is sent to the selected terminal a of the changeover switch 23f. The output from the D-FF 23a inverted by the NOT circuit 23d and the output from the D-FF 23b are sent to the AND circuit 23e, and the output from the AND circuit 23e is sent to the selected terminal b of the changeover switch 23f. The changeover switch 24f is controlled by a track selection signal C from the controller 8 shown in FIG.
The output from the changeover switch 24f is used as the track identification data detection pulse E as the selected terminal a of the changeover switch 27.
Is sent to the AND circuit 24 via AM detection circuit 22
Then, the outputs from the D-FFs 22a to 22c are inverted by NOT circuits 22g to 22i, respectively, and
j, and the respective outputs from the D-FFs 22d to 22f are sent to the AND circuit 22j as they are. AND circuit 2
The output from 2j is sent to the AND circuit 24 as an AM detection pulse D. The output from the AND circuit 24 is sent to the address data decoding circuit 25 shown in FIG.

The synchronization detection operation with track identification by the circuit of FIG. 5 will be described with reference to FIGS. The track identification data detection circuit 23 shown in FIG.
A changeover switch 27 inserted and connected between the control circuit 28 and the AND circuit 24 is used to select whether or not the track identification function is enabled, as described later. In the following description, it is assumed that the track identification data detection pulse from the track identification data detection circuit 23 is sent to the AND circuit 24 by switching to the selected terminal a.

FIG. 6 shows the case where the beam spot of the laser beam (SP in FIG. 1) scans the land track L1 and the like in FIG. 1, and FIG. 7 shows the case where the beam spot scans the groove track G1 and the like in FIG. Respectively. In this case, a case is shown in which both land and groove signals are detected by crosstalk as the PIT RF signal, and both land and groove address area information is obtained as binary data. This is, for example, FIG.
When the beam spot SP scans over the land track L1, the level of the crosstalk component appears relatively large because the correlation between the VFOs and AMs of the address areas G0 and G1 is high.

The 8-bit shift register composed of the D-FFs 23a, 23b and 22a to 22f of FIG. 5 is driven by the channel clock A of FIGS. 6 and 7, and the binary data B of FIGS. The data is input to this 8-bit (8-channel bit) shift register. AM in FIG.
When the 6-channel bit AM pattern (111000), that is, the 3-channel bit “1” is input to the 6-bit shift register of the detection circuit 22 after the 3-channel bit “1”, the AND circuit 22j outputs Is "1". Also, in the track identification data detection circuit 23 of FIG.
Is input, the output from the AND circuit 23c is "1", and when the 2-channel bit "10" is input, the output from the AND circuit 23e is "1".

When the target track to be accessed is a land track, the controller 8 shown in FIG.
FIG. 5 shows "0" or "L" as the track selection signal D.
To the changeover switch 23f to control the switching to the selected terminal a side. Therefore, the track identification data detection circuit 2 shown in FIG.
3, the output from the AND circuit 23c is
The signal is selected as 3f and taken out as a track identification data detection pulse E.

FIG. 6 is a timing chart showing the output signal waveform of each part when such a land track is selected.
At time _{t 1} the land identification signal LID successively to the AM (pattern "11") is input, the pulse _{P 11} to the output of the AM detection pulse D from AM detection circuit 22 of FIG. 5
Appears, the pulse P ₁₂ appears at the output of the track identification data detection pulse E from the track identification data detection circuit 23. Thus the output of the synchronous detection pulse F from the AND circuit 24, a pulse P ₁₃ is obtained, is sent to the address data decoding circuit 25 of FIG. 4, the decoding operation of the address data is started this pulse P ₁₃ as a trigger.

[0039] In contrast, in the timing of time t ₂ that is input (pattern of "10") groove identification signal GID successively to the AM, track identifying data detection pulse E from the track identification data detection circuit 23 No pulse appears in the output of the synchronous detection pulse F from the AND circuit 24. Therefore, even if the address area information of the groove track is detected and input as the binary address data by the crosstalk as described above, the address data decoding circuit 25 does not malfunction.

FIG. 7 shows that the target track to be accessed is a groove track, the track selection signal D is "1" or "H", and the changeover switch 23f of FIG. 5 is connected to the selected terminal b side. This is for explaining the operation when there is. At this time, the output from the AND circuit 23e is extracted as a track identification data detection pulse E.

In the example shown in FIG.
Input the land identification signal LID (“11” pattern)
Time t₃ Then, a pulse is output to the output of the AM detection pulse D.
SU ₃₁Appears, but the track identification data detection pulse E
No pulse appears at the output of the synchronous detection pulse F
No pulse is obtained at the output. Next, continue to the above AM
The groove identification signal GID (“10” pattern)
Time t₄ At the timing, the AM detection pulse
Pulse P on D output₄₁Appears and track identification
Pulse P is applied to the output of data detection pulse E₄₂Will appear
From the output of the synchronization detection pulse F, the pulse P₄₃Is obtained
It is sent to the address data decode circuit 25 in FIG.
Pulse P₄₃Of address data with trigger as a trigger
The operation starts.

Therefore, when a groove track is selected, even if the address area information of the land track due to crosstalk is input as binary data, it is not erroneously detected, and only the address area information of the groove track is read. be able to.

As is apparent from FIGS. 6 and 7, even if the AM detection pulse is output in both the land and the groove, the AM detection pulse and the track identification data detection pulse are output in the same manner.
By taking D, it is possible to output a synchronization signal only to the position of the land address when in the land, and to output a synchronization signal only to the position of the group address when in the group.

As described above, a track identification signal for discriminating between adjacent tracks, for example, between a land track and a groove track, is provided in the vicinity of a synchronization signal (for example, address mark AM). In addition, by detecting a track identification signal included in a target address by a track selection signal, a desired address signal can be accurately reproduced without being affected by a signal from an adjacent track. it can.

Therefore, according to the embodiment of the present invention, (1) the crosstalk of the address synchronization signal (for example, the address mark AM) of the adjacent track causes the synchronization detection circuit to operate and the address demodulation circuit to operate erroneously. No more. (2) There is no need to read the address of an adjacent track and generate a timing signal from the incorrect address position. (3) In actualization, only a few circuits need to be added to the current circuit, so that the load on the device is small. (4) Since the track pitch can be reduced, a high-density optical disk can be realized. (5) The address of the next track is not read by mistake. The effect is obtained.

Here, the changeover switch 27 inserted and connected between the track identification data detection circuit 23 and the AND circuit 24 in FIG. 5 selects whether or not to enable the above-described track identification function. Control terminal 2
8 is switched to the selected terminal a by the control signal from the control signal 8, the track identification data detection pulse from the track identification data detection circuit 23 is sent to the AND circuit 24, and the synchronization with the track identification as described above is performed. Detection is performed. Further, in the case of using a disk or the like of a recording format having no track identification signal, or in the case where crosstalk is small depending on the position on the disk, the switching switch 27 is switched and connected to the selected terminal b side.
Since "H" (or "1") is always sent to the AND circuit 24, synchronization detection is performed only by the AM detection pulse from the AM detection circuit 22.

In the above-described embodiment, the case where the adjacent track is identified when the track pitch is narrowed by increasing the density of the recording track has been described. However, when the recording layer is multilayered in order to increase the medium capacity. The present invention can be similarly applied to the discrimination between layers.

That is, in an information recording medium such as a multi-layer disc formed by laminating a plurality of recording layers on which recording tracks for recording information are arranged, an address area such as an address mark AM is provided in the address area of the recording track. A synchronization signal, a recording layer identification signal arranged in the vicinity of the synchronization signal, and an address signal indicating read timing determined by the synchronization signal and representing position information are recorded in advance. When reproducing an information recording medium such as a multi-layer disk having such an address area, the synchronization signal (AM or the like) and the recording layer identification signal are detected together, and based on the detected synchronization signal, By reproducing the address signal, an address signal of a desired recording layer can be accurately reproduced without being affected by a crosstalk signal from a recording track of another layer.

In the case of this multilayered information recording medium,
The recording layer identification signal is preferably arranged near the synchronization signal, and an error detection code or an error correction code is applied to the recording layer identification signal and the address signal. preferable.

By using such a recording layer identification signal, an address synchronization signal (address mark A) between recording layers can be obtained.
M) causes the synchronization detection circuit to operate,
The address demodulation circuit does not operate erroneously, and the address of another recording layer is not read and the timing signal from the incorrect address position is not generated. Further, by performing such a recording layer identification, it is possible to realize multi-layering by adding only a small number of circuits to the current circuit, thereby reducing the load on the device and increasing the height of the information recording medium such as an optical disk. Density can be increased.

It should be noted that the present invention is not limited to only the above-described embodiment. For example, in addition to the magneto-optical disk described in the embodiment, address regions of various disk-shaped recording media and the like are formed in advance. The present invention can be applied to an information recording medium having a recorded recording track. Also,
The specific example of the address area information is not limited to the example of FIG. 1 described above, and the specific circuit configuration is not limited to the configuration examples of FIGS.

[0052]

According to the present invention, a synchronizing signal and a track identification signal arranged near the synchronizing signal are recorded on the recording track of the information recording medium on which recording tracks for recording information are arranged adjacently. A signal and an address signal indicating the position information whose reading timing is determined by the synchronizing signal are recorded and formed in advance, and when reproducing the address signal of the information recording medium, the synchronizing signal and the track identification signal are combined. In addition, by detecting the address signal and reproducing the address signal based on the detected synchronization signal, a desired address signal can be accurately reproduced even when crosstalk between adjacent tracks is large due to a narrow track pitch.

Therefore, the synchronization detection circuit operates due to the crosstalk of the address synchronization signal (address mark AM or the like) of the adjacent track, and the address demodulation circuit does not operate erroneously. No timing signal is generated from the wrong address position. Also, when such track identification is performed, the track pitch can be narrowed by adding only a few circuits to the current circuit.
It is possible to increase the density of an information recording medium such as an optical disk while reducing the load on the device.

According to the present invention, a synchronizing signal and a synchronizing signal are arranged on the recording track of an information recording medium having a plurality of recording layers on which recording tracks for recording information are arranged. The recording layer identification signal and the address signal representing the position information determined at the read timing by the synchronization signal are recorded and formed in advance, and when reproducing the address signal of the information recording medium, the synchronization signal and the recording signal are recorded. By detecting the address signal together with the layer identification signal and reproducing the address signal based on the detected synchronization signal, it is possible to accurately reproduce a desired address signal even when crosstalk between recording layers is large due to multi-layering. Can be.

Accordingly, the synchronization detection circuit operates due to the crosstalk of the address synchronization signal (such as the address mark AM) between the recording layers, so that the address demodulation circuit does not operate erroneously, and the addresses of other recording layers are read. Therefore, a timing signal is not generated from the wrong address position. According to such recording layer identification, multi-layering can be realized by adding only a small number of circuits to the current circuit, so that it is possible to reduce the load on the device and increase the density of information recording media such as optical disks. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an example of an information recording medium according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an example of a modulation method of track area information.

FIG. 3 is a block diagram illustrating a schematic configuration of a magneto-optical disk drive device to which an embodiment of the present invention is applied;

FIG. 4 is a block diagram illustrating a configuration example of an address signal demodulation circuit 7 of FIG. 3;

FIG. 5 is a block diagram showing a specific configuration example of an AM detection circuit 22, a track identification data detection circuit 23, and an AND circuit 24 of FIG.

FIG. 6 is a timing chart for explaining a land track synchronization detection operation with track identification.

FIG. 7 is a timing chart for explaining a groove track synchronization detection operation accompanied by track identification.

[Explanation of symbols]

1 magneto-optical disk, 7 address signal demodulation circuit,
8 controller, 21 binarization circuit, 22 AM
(Address mark) detection circuit, 23 track identification data detection circuit, 24, 22j, 23c, 23e AN
D circuit, 25 address data decode circuit, 22a
22f, 23a, 23b D-FF (D-type flip-flop), 22g to 22i, 23d NOT circuit,
23f, 27 selector switch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D044 BC02 CC04 DE32 DE38 DE57 DE70 FG18 GM02 5D090 AA01 CC04 CC14 DD02 EE15 FF07 FF45 GG26 GG28

Claims (21)

[Claims] 1. An information recording medium in which recording tracks for recording information are arranged adjacent to each other, wherein the recording tracks include a synchronization signal, a track identification signal disposed near the synchronization signal, An information recording medium, wherein a reading timing is determined by a synchronization signal and an address signal representing position information is recorded in advance. 2. The information recording medium according to claim 1, wherein the track identification signal identifies an adjacent recording track. 3. The information recording medium according to claim 1, wherein the track identification signal is arranged near the synchronization signal. 4. The information recording medium according to claim 1, wherein an error detection code or an error correction code is applied to the track identification signal and the address signal. 5. An information reproducing apparatus for reproducing an information recording medium in which recording tracks for recording information are arranged adjacent to each other, wherein the recording tracks of the information recording medium include a synchronizing signal and a synchronizing signal of the synchronizing signal. A track identification signal arranged in the vicinity and an address signal indicating position information determined at the read timing by the synchronization signal are recorded in advance. When the address signal is reproduced, the synchronization signal and the track identification signal are recorded. And a reproducing means for reproducing the address signal based on the detected synchronizing signal. 6. The information reproducing apparatus according to claim 5, wherein the track identification signal identifies an adjacent recording track. 7. The information reproducing apparatus according to claim 5, wherein the track identification signal is arranged near the synchronization signal. 8. The information reproducing apparatus according to claim 5, wherein an error detection code or an error correction code is applied to the track identification signal and the address signal. 9. An address reproducing method for reproducing an address signal recorded in advance on said recording track on an information recording medium on which recording tracks for recording information are arranged adjacently, wherein said recording track of said information recording medium is A synchronization signal, a track identification signal arranged near the synchronization signal, and an address signal indicating position information determined by the synchronization signal at a read timing, are recorded in advance, and the address signal is reproduced. An address reproducing method comprising: detecting the synchronization signal and the track identification signal together; and reproducing the address signal based on the detected synchronization signal. 10. The address reproducing method according to claim 9, wherein the track identification signal identifies an adjacent recording track. 11. The address reproducing method according to claim 9, wherein said track identification signal is arranged near said synchronization signal. 12. The address reproducing method according to claim 9, wherein an error detection code or an error correction code is applied to the track identification signal and the address signal. 13. An information recording medium having a plurality of recording layers on which recording tracks for recording information are arranged, wherein the recording tracks include a synchronization signal and a recording layer identification disposed near the synchronization signal. An information recording medium, characterized in that a signal and an address signal whose read timing is determined by the synchronizing signal and indicates position information are recorded in advance. 14. The information recording medium according to claim 13, wherein the recording layer identification signal is arranged near the synchronization signal. 15. The information recording medium according to claim 13, wherein an error detection code or an error correction code is applied to the recording layer identification signal and the address signal. 16. An information reproducing apparatus for reproducing an information recording medium having a plurality of recording layers on which recording tracks for recording information are arranged, wherein the recording tracks include a synchronizing signal and a signal near the synchronizing signal. The arranged recording layer identification signal and the address signal representing the position information whose read timing is determined by the synchronization signal are recorded in advance. When the address signal is reproduced, the synchronization signal and the recording layer identification signal are read. And a reproducing means for reproducing the address signal based on the detected synchronizing signal. 17. The information reproducing apparatus according to claim 16, wherein the recording layer identification signal is arranged near the synchronization signal. 18. The information reproducing apparatus according to claim 16, wherein an error detection code or an error correction code is applied to the recording layer identification signal and the address signal. 19. An address reproducing method for reproducing an address signal pre-recorded on said recording track in an information recording medium having a plurality of recording layers on which recording tracks for recording information are arranged. The recording track is pre-recorded with a synchronization signal, a recording layer identification signal arranged near the synchronization signal, and an address signal indicating position information whose read timing is determined by the synchronization signal. When reproducing a signal, an address reproducing method characterized by detecting the synchronization signal and the recording layer identification signal together and reproducing the address signal based on the detected synchronization signal. 20. The address reproducing method according to claim 19, wherein the recording layer identification signal is arranged near the synchronization signal. 21. The address reproducing method according to claim 19, wherein an error detection code or an error correction code is applied to the recording layer identification signal and the address signal.