JPH03130928A - Recording medium - Google Patents

Abstract

PURPOSE:To increase usable data regions by providing a reference pattern for detecting a reference position in the servo region of at least one segment within one track. CONSTITUTION:The reproduction signal from an optical disk is supplied via an input terminal 20 to a synchronizing pattern detecting circuit 21 and an address reproducing circuit 22 and the reproduction timing signal from the clock pit of the servo region is supplied from a timing controller 27. The reference pattern recorded in the servo region at the top of tracks is detected in the circuit 21 and a segment counter 24 and a sector counter 25 are initialized and are operated by the clock signal from the controller 27. The count information is sent from the controller 27, by which the revolutions are synchronized. Track addresses are reproduced in the circuit 22 and are stored into a track address register 26 by the clock signal from the controller 27. The management of the recording/reproducing is executed by using the address information.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a sample servo type recording medium.

B0 Summary of the Invention The present invention provides a sample servo type recording medium in which a segment consisting of a servo area where a servo signal is recorded and a data file area where data is recorded is arranged in the track direction which is the recording/reproducing direction. By having a reference pattern for detecting a reference position in the servo area of at least l segment in the track, an access code is provided in the servo area, and position information on the track is entered in the access code of the servo area having the reference pattern. As a result, sector marks and sector addresses that were conventionally required are eliminated, and sectors within a track and segments within a sector can be managed.

C9 Conventional technology Recording media, for example, optical disks such as write-once optical disks and magneto-optical disks, are rotated by a spindle motor or the like at constant linear velocity (CLV) or constant angular velocity (CAV), and a spiral or Data (information) is recorded/reproduced on concentric recording tracks. In addition, in these optical disks, the so-called self-clock method and external clock method are known as clock synchronization methods during data recording/reproduction. ) is arranged in the track direction, which is the recording/playback direction, and the sample servo method (or discrete block method) is known in which clock synchronization and tracking servo control are performed using servo signals in the servo region. ing.

Here, a sample servo type optical disc will be explained using FIG. 4. In FIG. 4, one track of the optical disc 1 is composed of a sector 2 which is a recording unit of n pieces of data (information), and one sector is composed of m segments. The l segment is composed of a servo area 3 and a data area 4 (a header area 5 in which addresses and the like are recorded in the first segment of the sector or in the first few segments). The servo area 3 includes a clock pit 16 for synchronizing clocks, a pair of so-called wobble pits 17a for obtaining a tracking error signal,
17b, and information corresponding to a plurality of pits on the lower side of the track address, for example, an access code 18 using a gray code, is provided in advance in the case of a disk type disk drive in order to improve access performance in the radial direction. Here, a pattern composed of the clock pit 16 and wobble pits 17a and 17b is referred to as a synchronization pattern I5.

In addition, in the header area 5 following the servo area 3 of the first segment, which is the first segment of the sector, there is a sector mark 6 indicating the beginning of the sector, and in the address area 7, a track address (track number), a sector address (sector number)
Address information (10 codes) such as ``10 codes'' are recorded in advance on the disk-type memory card. For example, in the case of a magneto-optical disk, data (information) is recorded/reproduced in the data area 4 following the servo area 3 of the second to m-th segments using the magneto-optic effect.

Here, a synchronization control operation (rotation synchronization control, tracking servo control, etc.) in a recording/reproducing apparatus that records and reproduces data on an optical disc having the above recording format will be described. FIG. 5 is a block circuit diagram showing the main parts of the recording/reproducing apparatus. In FIG. 5, a reproduction signal reproduced from an optical disk that is rotationally driven at a constant angular velocity (CAV) by a spindle motor is input to an input terminal 60.
The signal is supplied to a synchronization pattern detection circuit 61, a sector mark detection circuit 62, an address reproduction circuit 63, an access code reproduction circuit 64, and a servo information generation circuit 65, respectively. These circuits also include the servo area 3.
A reproduction timing signal reproduced from the clock pit 16 is supplied from the timing controller 72.

In the synchronization pattern detection circuit 61, the synchronization pattern 15 of the servo area 3 is detected, and a byte counter 66 for managing time within the segment is initialized. This byte counter 66 counts the number of bytes in the l segment by counting a predetermined clock signal from the timing controller 72, and when it counts up a predetermined number (counts up), a carry signal is sent to the segment counter 67.

The sector mark detection circuit 62 detects the sector mark 6 in the header area 5, and initializes the segment counter 67 that manages time in units of segments within the sector. This segment counter 67 is the byte counter 6.
By counting the carry signals from 6, the number of segments in one sector is counted, and when a predetermined number (m) is counted (counted up), the carry signal is sent to the sector counter 68.

In the address reproduction circuit 63, the sector address of the header area 5 is reproduced, and the sector counter 68, which manages time in units of sectors within a track, is initialized in synchronization with the reproduction of the sector address. This sector counter 68 counts the number of sectors (maximum n) within one track by counting the carry signal from the segment counter 67.

The byte counter 66, segment counter 67, and sector counter 68 are operated by a predetermined clock signal from the timing controller 72, and each count information from these counters is transmitted to the timing controller 72.
Rotation synchronization such as segment synchronization, sector synchronization, and trunk synchronization is performed.

After the rotation is synchronized, the servo information generation circuit 65 generates servo information such as tracking servo control based on the reproduction signals of the Wopno P pits 17a and 17b in the servo area 3, and this servo information is transmitted to the timing controller 72. The information is stored in the servo information register 71 using a predetermined clock signal from the servo information register 71. Then, tracking servo control is performed based on this servo information, and the reproduced track address is stored in the track address register 69 by a predetermined clock signal from the tracking controller 72 in the address reproduction circuit 63. .

In the access code reproducing circuit 64, an access code (a plurality of lower bits of the track address) is reproduced from the access code 18 of the servo area 3, and is stored in the track access register 70 according to a predetermined clock signal from the timing controller 72. .

The track address stored in the track address register 69, the access code stored in the track access register 70, and the servo information stored in the servo information register 71 are taken out from the terminals, and using these address information etc. Data (information) recording/reproduction management is performed.

D0 Problems to be Solved by the Invention By the way, if a sector mark and a sector address (sector number) are provided in the header area 5 of each sector as described above,
The area for recording data becomes smaller, reducing the recording capacity of the entire optical disk! (data area available to the user) decreases. Furthermore, a sector mark detection circuit and a circuit for reproducing sector addresses are required within the recording/reproducing apparatus, increasing the cost of the recording/reproducing apparatus.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to write sector addresses such as sector addresses using, for example, synchronization patterns that are recorded in the servo area in advance in a recording medium, such as a sample servo type optical disk. The purpose of the present invention is to provide a recording medium with a large recording capacity from which information can be obtained, and to reduce the cost of the recording/reproducing device by removing the sector mark detection circuit and the circuit for reproducing sector addresses from the recording/reproducing device. The purpose is to provide a recording medium that can.

A recording medium according to the present invention is a sample in which a segment consisting of a servo area where a servo signal is recorded and a data area where data is recorded is arranged in the track direction which is the recording/reproducing direction. The above problem is solved by providing a reference pattern for detecting a reference position in the servo area of at least one segment in one track in a servo type recording medium.

Further, the above problem is solved by providing an access code in the servo area and including positional information on the track in the access code of the servo area having the reference pattern.

10 Effects According to the recording medium according to the present invention, when recording/reproducing data (information) on a recording medium, for example, an optical disc, sector information such as a sector address is obtained using the reference pattern or the reference pattern and access code. be able to.

G. Examples Examples of the recording medium according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an optical disc, which is an embodiment of a recording medium according to the present invention, together with a recording format.

This optical disk is, for example, a write-once optical disk, a rewritable magneto-optical disk, etc., and is rotated by a spindle motor or the like at a constant angular velocity (CAV), and is mounted on a recording trunk provided spirally or concentrically on the disk. Data (information) is now recorded/played on. Furthermore, a sample servo method (or discrete block method) is used as a clock synchronization method when recording/reproducing data. That is, a segment consisting of a servo area where servo signals are recorded and a data area where data is recorded is arranged in the track direction which is the recording/reproducing direction, and one sector is the recording unit of data (information). It is composed of JI number of segments, and one track is composed of multiple sectors. It reproduces the servo signal recorded in the servo area, performs clock synchronization, tracking servo control, and records/reproduces data. ing.

In FIG. 1, one track of an optical disc I is composed of sectors 2 which are n data recording units, and one sector is composed of m segments. Further, one segment is composed of a servo area 3 and a data area 4.

In the servo area 3, a clock bit 11 for clock synchronization and a pair of so-called wobble bits 12a and 12b for obtaining a tracking error signal are provided in advance at the time of disk formation. In addition, in the remaining area following the synchronization pattern 10 of the servo area 3, information corresponding to the lower bits of the track address is stored as an access code using a Gray code in order to improve access performance in the radial direction, for example. The information is recorded in advance when the disc is formed. For example, in the case of a magneto-optical disk, data (information) is recorded in the data area 4 using the magneto-optic effect.
will be played. Also, the first segment, which is the first segment of the sector,
A trunk address (track number) may be provided in advance in the data area 4 following the servo area 3 of the segment at the time of disk formation. Here, the above clock bit 1
1. A pattern composed of wobble bits 12a and 12b is defined as a synchronization pattern 10.

In addition, in the present invention, in order to increase the data area available to the user, the area for recording sector marks and sector addresses, which was conventionally required, is deleted, and instead,
For example, sector information such as a sector address is obtained using the synchronization pattern 10 and the like.

Specifically, as shown in FIG.
For example, a standard pattern P1 is provided in the servo area 3 at the beginning of a track, and a conventional pattern P0 is provided in all other servo areas 3. is recorded in advance so that the beginning of the track can be identified.

For example, when one track is composed of 16 segments, the reference pattern P1 is placed in the servo area 3 at the beginning of the first sector, which is the first sector of the track, and the servo area 3 at the beginning of the third sector, for example, is placed in the remaining sectors. jiM
3 is a reference pattern Pt.

In the servo area 3 at the beginning of the fifth sector, a plurality of (in this example, two) different reference patterns for each sector, such as the reference pattern P3, are recorded and formed in advance, and in all other servo areas 3, the conventional pattern P0 is recorded. The recording format is set in advance so that the beginning of the track can be identified, and even if the reference pattern P1 recorded in the servo area 3 at the beginning of the track cannot be detected due to a defect in the disk, other reference patterns ( For example, sector information is obtained using reference patterns P2 to pe).

By the way, if it is difficult to select many types of reference patterns as described above without affecting other signals within the limited synchronization pattern 10, one type of reference pattern may be used,
This reference pattern is recorded in the servo area 3 for each of multiple sectors, and the position information on the track is entered in the above-mentioned access code following this reference pattern, and the sector address etc. is written using both the reference pattern and the position information of the access code. Get sector information. In addition, one access code is
If there is not enough capacity to record sector information such as sector addresses, the sector information may be divided and stored in multiple access codes.

FIG. 2 is a block circuit diagram of the main parts of a recording/reproducing apparatus that records/reproduces data on an optical disc having the recording format shown in FIG. 1. In FIG. 2, a reproduction signal reproduced from an optical disk rotationally driven at a constant angular velocity (CAV) by a spindle motor is supplied to a synchronization pattern detection circuit 21 and an address reproduction circuit 22 via an input terminal 20. There is. Further, a reproduction timing signal reproduced from the clock pit 11 in the servo area 3 is supplied from a timing controller 27 to the synchronization pattern detection circuit 21 and the address reproduction circuit 22.

In the synchronization pattern detection circuit 21, the conventional pattern P0 and the reference pattern P recorded in the servo area 3,
Pa to Pa, that is, all synchronization patterns 10 are detected, and the byte counter 23 that manages time within the segment is initialized. This byte counter 23 counts the number of bytes in the l segment by counting a predetermined clock signal from the timing controller 27, and when it counts up a predetermined number (counts up), a carry signal is sent to the segment counter 24.

In the synchronization pattern detection circuit 21, a reference pattern recorded, for example, in the servo area 3 at the beginning of a track, for example, reference pattern P, is detected, and a segment counter 24 that manages time in units of segments in a sector and sectors in the track are detected. The sector counter 25 that performs unit time management is initialized. This segment counter 24 is
By counting the carry signals from the byte counter 23, the number of segments in one sector is counted.

That is, the byte counter 23 is incremented (increased by 1) every time the byte counter 23 carries a carry, and when a predetermined number (m) has been counted (counted up), a carry signal is sent to the sector counter 25. This sector counter 25 counts the number of sectors (maximum n) in one track by counting the carry signal from the segment counter 24. That is, the segment counter 24 is incremented (increased by l) every time the segment counter 24 carries. The byte counter 23, segment counter 24, and sector counter 25 are operated by a predetermined clock signal from the timing controller 27, and each count information from these counters is sent to the timing controller 27 for segment synchronization and
Rotational synchronization such as sector synchronization and track synchronization is achieved.

As mentioned above, the reference pattern P is recorded in the first servo area 3 of the first sector, which is the first sector of the trunk, and the reference patterns P2 to P are recorded in each of the remaining sectors. When the servo fIJr area 3 is prerecorded and the reference pattern P1 recorded in the servo area 3 at the beginning of the track cannot be detected due to a defect in the disk, the synchronization pattern detection circuit 21 detects the reference pattern P1. Sector addresses (sector numbers) corresponding to other reference patterns (reference patterns P2 to pe) are supplied as initial values to the sector counter 25, and counting is started from this initial value.

After the rotation is synchronized, the address reproducing circuit 22 reproduces the track address, and the reproduced track address is stored in the track address register 26 in response to a predetermined clock signal from the timing controller 27. Note that the access code reproducing operation, servo information generation operation, and tracking servo control operation may be performed, for example, in the same manner as in the conventional technology described above, so track addresses obtained in the manner of 0 or more, which are not shown in the drawings and will not be described further, may be used. Data (information) recording/reproduction management is performed using the address information.

FIG. 3 is a block circuit diagram of the main parts of the recording/reproducing apparatus when one type of reference pattern is used as described above and position information on the track is included in the access code. This third
In the figure, the operations of the byte counter 33 and segment counter 34 are the same as the operations of the byte counter 23 and segment counter 24 shown in FIG. 2, so a description thereof will be omitted.

After the reference pattern is detected by the synchronization pattern detection circuit 31, when the position information recorded in the access code is reproduced by the access code reproduction circuit 32, the sector counter 35 is set to the sector address corresponding to this position information as an initial value. is supplied to start counting from this initial value.

As mentioned above, if the number of segments that make up a sector and the number of sectors that make up a track are specific, for example, if the number of segments in one sector is m, and the number of sectors in a rack is n, then based on the reference pattern By detecting the head of the track and counting the number of segments m and the number of sectors n, it becomes possible to manage segments and sectors. Therefore, the sector mark that was previously required,
It becomes possible to eliminate the area for recording sector addresses, and the data (information) recording capacity can be increased. In addition, the sector mark detection circuit from the recording/playback device,
By reducing the circuitry that reproduces sector addresses,
Cost can be reduced.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, the recording medium may include, in addition to magneto-optical disks, for example, organic dye-based optical disks, various write-once disks, overwritable disks,
Applicable to optical cards, magneto-optical cards, etc.

H1 Effects of the Invention As is clear from the above explanation, the recording medium according to the present invention eliminates sector marks and sector addresses,
For example, a reference pattern is recorded using an area for recording a synchronization pattern in the servo area, and the start position of the track is detected based on this reference pattern, and the number of sectors is determined.
By counting the number of segments, segments and sectors can be managed. As a result, it becomes possible to increase the data area available to the user. Furthermore, it is possible to eliminate the sector mark detection circuit and the sector address reproduction circuit in the recording/reproduction device, thereby realizing cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an optical disc as an embodiment of a recording medium according to the present invention, together with a recording format, and FIG. 2 is a block circuit diagram of the main parts of a recording/reproducing apparatus for a recording medium according to the present invention. FIG. 3 shows the recording/recording of the recording medium of the second embodiment.
FIG. 4 is a block circuit diagram of the main parts of the playback device, and FIG. 4 is a diagram showing a conventional optical disc along with its recording format.
FIG. 5 is a block circuit diagram of the main parts of a conventional recording/reproducing device. 21...Synchronization pattern detection circuit 23...Byte counter 24...Segment counter 25...Sector counter 10 digits) 7 Figure 1

Claims (2)

[Claims] (1) In a sample servo type recording medium in which a segment consisting of a servo area where a servo signal is recorded and a data area where data is recorded is arranged in the track direction which is the recording/playback direction, at least one segment in one track. A recording medium comprising a reference pattern for detecting a reference position in the servo area. (2) The recording medium according to claim (1), wherein an access code is provided in the servo area, and position information on the track is included in the access code of the servo area having the reference pattern.