JPH0554543A - Recording medium - Google Patents

Abstract

PURPOSE:To provide the recording medium with which the control based on reference data can be commonly executed in respective zones even when zoning recording is executed. CONSTITUTION:Areas for recording the reference signals for managing the quality of recording signals are provided at the prescribed intervals based on the clocks of recording data in the zone on the innermost peripheral side of the disk-shaped recording medium which is recorded and reproduced while being rotated at a specified speed, is divided to a prescribed number of zones (zone A, zone B) in its radial direction and records the digital data of the clocks varying in the respective zones. The areas for recording the reference data are provided at the prescribed intervals based on the clocks of the recording data in the other zones as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium suitable for application to, for example, a magneto-optical disk.

[0002]

2. Description of the Related Art In a disk-shaped recording medium, as a control of the rotation speed when recording / reproducing data, a constant rotation speed (CA) for recording / reproducing at a constant rotation speed
V) control and constant linear velocity (CLV) control for recording / reproducing at a constant linear velocity. Comparing these two types of control, in the case of the constant rotation speed control, the rotation speed is constant, so that the speed control is relatively simple, and the control data such as the track address can be recorded at constant intervals. Search can be done easily. Further, in the case of the constant linear velocity control, the rotation speed needs to be changed according to the position of the optical pickup, which complicates the speed control system, but since the recording density can be made constant, the rotation speed is constant. Although the amount of recorded information can be made larger than that of control, it is difficult to record control data such as a track address at equal intervals, so that there is an inconvenience that the track search is troublesome.

Generally, in the case of a magneto-optical disk having a large data recording capacity, data can be recorded / reproduced by a constant rotation speed control which facilitates track search so that necessary data can be easily searched. Many are set to be performed. However, as described above, the constant rotation speed control has a disadvantage that the recording capacity is lower than that of the constant linear speed control, and a zoning recording method has been proposed as a method for increasing the recording capacity by recording by the constant rotation speed control.

FIG. 1 shows an example of a recording medium (magneto-optical disk) on which this zoning recording is performed. The data recording area of the disk is divided into a zone A near the center of the disk and a zone B near the periphery. The track in each zone is divided into two parts, and the constant rotation speed control for recording / reproducing at the same rotation speed is performed, and the clock rate or the rotation speed of the recorded data is changed between zone A and zone B. is there. By doing so, the recording capacity can be increased.

12 and 13 are views showing that the recording capacity is increased by this zoning recording. FIG. 12 shows an example in which zoning recording is performed by dividing into 3 zones, and FIG. 13 shows an example without zone division (rotation speed). In the case of constant control), an example in which data is recorded in pits on each disk is shown. Here, when zoning recording is performed as shown in FIG. 12, the innermost track T1 of each zone 1, 2, 3 is
The recording linear densities of 1, T21 and T31 are set to be the same. In each zone 1, 2, 3, constant rotation speed control is performed (the clock rate or the rotation speed of the recording data changes when the zone changes), so the recording linear density decreases as the track becomes closer to the outer peripheral side. .. By dividing into a plurality of zones in this way, the linear recording density of one track can be returned to the highest state each time the zone changes, and the linear recording density becomes the highest as in the case where the zones are not divided as shown in FIG. The recording capacity can be greatly increased as compared with the case where the outer track is gradually lowered. That is, the outermost track without zone division has a very low linear recording density, but when the zone is divided into a plurality of zones, a certain degree of linear recording density is secured even with the outermost track. In this case, the recording capacity can be further increased by increasing the number of zones.

In the case of recording various data on such a magneto-optical disk, when the recording density is increased to some extent, the reference data is recorded first so that the recorded data can be reproduced well. I have to. At the time of reproduction, the phase of the clock signal of the reproduction system circuit is matched with this reference data so that various data recorded subsequent to the reference data can be reproduced well.

[0007]

By the way, when the reference data is recorded on the recording medium for performing the above-mentioned zoning recording, if the recording location of the reference data is adapted to the track configuration of each zone, However, there is an inconvenience that the data structure (1 unit length of recorded data, etc.) changes. That is, in general, each track in each zone is
It is divided into a predetermined number of sectors, data recording is performed with each sector as a unit, and reference data is also recorded for each sector. Here, if the reference data is simply recorded at a predetermined position of one sector (for example, the head portion of each segment in one sector), it becomes necessary to detect the reference data by different control for each zone, Therefore, the control operation must be switched, and the configuration of the control system of the recording / reproducing apparatus becomes complicated.

In view of the above points, the present invention has an object to provide a recording medium which can be commonly controlled in each zone based on reference data.

[0009]

DISCLOSURE OF THE INVENTION The present invention is a disk-shaped recording / reproducing device which is rotated at a constant speed and is divided into a predetermined number of zones in the radial direction to record digital data of different clock rates in each zone. In the recording medium of, the innermost zone is provided with an area for recording a reference signal for managing the quality of the recording signal at a predetermined interval based on the clock of the recording data, and also in other zones. Areas for recording the reference data are provided at predetermined intervals based on the clock of the recording data.

[0010]

According to the present invention, the recording state of the reference data is the same in each zone, and the control based on the reference data can be commonly performed in any zone.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The present embodiment is applied to a magneto-optical disk capable of freely recording and reproducing data, and the magneto-optical disk is subjected to zoning recording as shown in FIG. That is, a plurality of tracks are formed concentrically on one magneto-optical disk, and the tracks are divided into a zone A composed of tracks closer to the center and a zone B composed of tracks closer to the outer periphery. In this case, for example, if the size of the magneto-optical disc is 32 mm in radius, the range of zone A is 16 mm to 22 mm, and the range of zone B is 22 mm to 30 mm. Then, data recording / reproduction is performed in each zone at a constant rotation speed, and in this example, zoning recording in which the recording data density is changed by changing the clock rate of the recording data for each zone.

As shown in FIG. 2, each of the annular tracks in each of the zones A and B is composed of 990 segments. In this case, each 1-unit segment is composed of a servo byte of 4 bytes and a recordable area of 21 bytes (for zone A) or 31.5 bytes (for zone B). First
The reference area, the second reference area, and the data area are set. The 4-byte servo byte at the beginning of each segment is a so-called pre-pit in which data is previously recorded in pits on the disc, and sample servo control is performed by the data of this pre-pit at the time of recording / reproducing. Further, the track address and the sector address are recorded by the data of this pre-pit and are used at the time of search.

21 bytes and 3 in the recordable area
The difference in recording capacity from 1.5 bytes is due to the difference in recording clock rate between zone A and zone B. That is, the zoning recording sets the linear recording density of the innermost track of zone A and the linear recording density of the innermost track of zone B to be substantially the same. Capacity varies from zone to zone.

The structure of each zone will be specifically described. In the case of the zone A, as shown in FIG. 3, 33 segments form one sector and one track forms 30 sectors. In the case of zone B, as shown in FIG.
One segment is composed of two segments, and one track is 45
A sector is constructed. In this case, the recording of data in the recordable area is performed in units of one sector. In addition, the positions of the sectors are aligned within each zone. Therefore, as shown by the broken line in FIG. 1, the boundary of each sector exists radially in each zone.

Here, in the case of zone A, as shown in FIG. 5, one byte of the recordable area following the servo bytes of each segment is set as the first reference area, and the quality of the recording signal is detected during reproduction. In the area where the reference data is recorded, specifically, a signal having a constant frequency is recorded, and the reference data for gain adjustment during reproduction (hereinafter referred to as the first reference data) is simultaneously recorded when the data is recorded in the data area. To be recorded. In this case, the second reference data recorded in the second reference area, which will be described later, and the first reference data recorded in the first reference area may be the same data.

In the case of the first segment of zone A, the 20 bytes following this first reference area are the second
Reference data for phase adjustment during reproduction (hereinafter referred to as second reference data) is simultaneously recorded when data is recorded in the data area. Like the first reference data, the second reference data is for detecting the quality of the recording signal at the time of reproduction, and the reproduction signal of the reference data and the system clock are synchronized at the time of reproduction. .. Then, from the second segment to the 33rd segment, a data area is used instead of the second reference area, and 20 bytes of data are recorded in each segment.

Therefore, in the case of zone A, one sector
33 bytes (1 byte x 33 segments) of the first reference data (gain adjustment reference data), 20 bytes of the second reference data (phase adjustment reference data), and 640 bytes (20 bytes x 32 segments) Various data (target data) and are recorded.

Further, in the case of zone B, as shown in FIG. 6, in the first segment, 31.
The first 1 byte in the recordable area of 5 bytes is the first
The following 20 bytes are used as the second reference area, the further 1 byte is used as the first reference area again, and the remaining 9.5 bytes are used as the data area. Then, in the second segment, the first 10.5 bytes of the recordable area of 31.5 bytes are used as the data area, and the data following the last data area of the first segment is recorded. That is, by combining the last data area of the first segment and the first data area of the second segment, a 20-byte data area is formed, and this 20-byte data area is used as a unit of data area. .. And 1 of the second segment
After the 0.5-byte data area, a 1-byte first reference area is provided, and the remaining 20 bytes are used as the data area again. Hereinafter, the area configuration similar to the first segment and the second segment is the last segment (the 22nd segment).
Segment) in 2 segment units.

Therefore, even in the case of zone B, one sector
33 bytes (2 bytes x 11 segments + 1 byte x 1
1 segment of 1st reference data (gain adjustment reference data), 20 bytes of 2nd reference data (phase adjustment reference data), and 640 bytes (9.5 bytes x 1 byte + 29.5 bytes x) Various data (target data) of 10 segments + 30.5 bytes × 11 segments) is recorded.

Thus, in zone A and zone B, 1
The storage capacities of the sectors are the same. Further, in this example, even in the case of the zone B, the reference data are inserted at the same intervals as in the zone A, and the arrangement of the reference areas and the data areas in the recordable area is common to the zones. In other words, the area configuration is exactly the same except for the servo bytes from each zone.

Next, a recording / reproducing apparatus for a magneto-optical disk in which each track is formed in this way will be described.

FIG. 7 is a diagram showing the structure of a recording / reproducing apparatus for a magneto-optical disk to which the present invention is applied. Reference numeral 1 denotes a magneto-optical disk, and this magneto-optical disk 1 has a zone A as shown in FIG. Zoning recording is performed by dividing the recording into two zones, i.e., zone B and zone B. The magneto-optical disk 1 is rotationally driven by a spindle motor 2, and a signal is recorded / reproduced by an optical pickup 3 having a semiconductor laser or the like built therein. The rotation control of the spindle motor 2 and various controls (seek control, etc.) of the optical pickup 3 are performed by a system controller 4 having a microcomputer configuration.

The data to be recorded on the magneto-optical disk 1 is RA from a recording data forming circuit (not shown).
It is supplied to the M control circuit 11 and temporarily stored in the RAM 12 under the control of the RAM control circuit 11. Then, the stored data is supplied from the RAM 12 to the modulation circuit 13 at a predetermined timing, the modulation circuit 13 performs recording modulation, and the modulated recording data is supplied to the writing circuit 14, and the writing circuit 14 A predetermined writing process is performed at 14, and the processed recording data is supplied to the optical pickup 3 to perform writing by the magneto-optical effect.

The data thus written on the magneto-optical disk 1 is read by the optical pickup 3 and supplied to the read circuit 15, and the data read by the read circuit 15 is demodulated. It is supplied to the circuit 16. Then, the data demodulated for reproduction by the demodulation circuit 16 is temporarily stored in the RAM 12, and the RAM control circuit 1
Under the control of 1, the data stored in the RAM 12 is read and supplied to the reproduction data output circuit (not shown) side.

Here, FIG. 8 and FIG. 9 show the detailed structure of the read circuit 15 and its surroundings necessary for reproduction. In this example, the magneto-optical disk 1 is recorded as zoning recording divided into two zones. Therefore, two types of read clocks are required. That is, when the configuration of the clock generation circuit is shown in FIG.
The reproduction signal supplied to the clock 5 is supplied to the clock pit extraction circuit 2
2 and the data of the servo byte is extracted by the clock pit extraction circuit 22. Then, the data of the extracted servo bytes is supplied to the first PLL circuit (phase locked loop circuit) 23 and the second PLL circuit 24. In this case, the first PLL circuit 23 is a circuit for converting input data into a signal having a frequency of 200 times.
A signal having a doubled frequency is supplied to the terminal 25 as a zone A data detection clock. In addition, the second PLL circuit 24
Is a circuit for converting the input data into a signal having a frequency of (200 × 1.5) times, that is, 300 times.
Supply to.

The structure of the read circuit 15 for extracting the reproduced data based on the clock thus created is shown in FIG.
The reproduction signal supplied to the AGC circuit (automatic gain adjustment circuit) 32, the amplitude detection circuit 33, and the clock phase detection circuit 3
4 and supply. Then, the amplitude detection circuit 33 detects the reproduction amplitude of the reference data, and the clock phase detection circuit 34 detects the reproduction phase of the reference data. Then, the detection data of both detection circuits 33 and 34 are supplied to a central control unit (CPU) 35 for read control. Then, the central controller 35 controls the gain adjustment amount of the reproduction signal performed by the AGC circuit 32 based on the supplied amplitude detection data. The gain adjustment in this case is performed based on the gain adjustment reference data recorded in the first reference area, which is prepared by 1 byte for each segment.

Further, correction data of the read clock is created based on the clock phase detection data supplied from the clock phase detection circuit 34, and this correction data is supplied to the clock phase correction circuit 39. In this case, the clock phase detection is performed based on the reference data of this area when the phase adjustment reference data is recorded in the data area of the first segment of each sector (that is, when the reference area exists). Then, the clock phase correction circuit 39 performs phase adjustment (phase shift) of the data detection clocks obtained at the terminals 25 and 26 based on the correction data, and supplies one of the adjusted clocks to the data detection circuit 38. ..

In this case, the clock supplied from the clock phase correction circuit 39 to the data detection circuit 38 is selected according to the zone of the reproducing portion of the disc. That is, when the zone A is reproduced, the clock output from the first PLL circuit 23 is phase-corrected and supplied to the data detection circuit 38, and when the zone B is reproduced, the second PL circuit is reproduced.
The clock output from the L circuit 24 is phase-corrected and supplied to the data detection circuit 38. Therefore, when reproducing the track of the zone A, as shown in FIG. 5, the reproduction data of the servo byte multiplied by 200 in the first PLL circuit 23 becomes the system clock and the read clock at the same frequency. .. Further, when reproducing the track of the zone B, as shown in FIG. 6, the reproduction data of the servo byte is multiplied by 200 in the first PLL circuit 23 to become the system clock for performing the control based on the servo byte. The read clock is multiplied by 300 in the second PLL circuit 24.

Then, the data detection circuit 38 is supplied with the reproduction signal whose gain is adjusted by the AGC circuit 32, and based on the clock supplied from the clock phase correction circuit 39,
The data recorded on the disc is decoded from the reproduction signal, and the decoded data is used as reproduction data in the terminal 40.
To the circuit in the subsequent stage via.

A terminal 36 indicates a terminal to which a reproduction signal of data recorded in pits, that is, a servo byte is supplied. The reproduction signal obtained at this terminal 36 is supplied to an address detecting circuit 37, and this address detecting circuit is supplied. The address data decoded at 37 is supplied to the central control unit 35, and the central control unit 35 determines the track or sector currently being reproduced from this address data.

When reproducing the data recorded on the magneto-optical disk 1 by the circuit configured as described above, FIG.
The processing is performed at the timings shown in FIG. That is,
In the case of zone A, as shown in FIG. 10A, during reproduction of 1-byte first reference data (gain adjustment reference data) of each segment of each sector, as shown in FIG. The reproduction amplitude of the reference data is detected at 33, and in the case of the first segment, the second reference data (reference data for phase adjustment) is continuously reproduced while
As indicated by 0C, the clock phase detection circuit 34 detects the reproduction phase of this reference data. Then, the central controller 35 determines the detection state of each of the reference data, and controls the gain adjustment amount in the AGC circuit 32 and the phase correction amount in the clock phase correction circuit 39. Then, in the state where the gain adjustment and the phase correction are performed in this manner, as shown in FIG.
As indicated by 0D, the data recorded in the data area from the second segment is decoded. Then, every time the segment is changed, the gain adjustment amount and the phase correction amount are readjusted based on the reference data that is similarly reproduced, so that good reproduction is continuously performed. In this case, in particular, the first reference data for gain adjustment is detected for each segment, so that the gain adjustment in the AGC circuit 32 can be performed in one segment cycle, and the gain adjustment is performed strictly in a short cycle. be able to.

Further, in the case of zone B, the structure of one segment is different from that of zone A, but as shown in FIG. 11A, during reproduction of 1-byte first reference data (reference data for gain adjustment). As shown in FIG. 11B, the amplitude detection circuit 33 detects the reproduction amplitude of the reference data, and
In the case of the first segment, subsequently, during reproduction of the second reference data (reference data for phase adjustment), as shown in FIG. 11C, after the reproduction phase of this reference data is detected by the clock phase detection circuit 34, Then, as shown in FIG. 11D, the first
The 9.5-byte data recorded in the segment is decoded in an adjusted state based on both reference data. Then, thereafter, as in the case of zone A, the gain of the first reference data is adjusted, and the data in the data area is decoded each time it is reproduced.

Although not shown, sample servo control is performed for each segment based on the data reproduced from the servo bytes of each segment, and the track address and sector address recorded in the servo bytes are recorded. Data decoding is also performed.

By performing recording / reproduction by the magneto-optical disk 1 in this manner, the zoning recording divided into zones is performed on the magneto-optical disk 1. However, common recording control and reproduction control are performed in each zone. You can do it. That is, excluding the servo bytes, the reference area and the data area are set at exactly the same intervals in each zone, and when recording data in the data area, recording processing with 20 bytes as one unit is performed in any zone. Therefore, it is not necessary to change the recording unit of data in each zone, and recording processing such as addition of a correction code can be performed by common control in each zone. Further, at the time of reproduction, data reproduction with 20 bytes as one unit is performed in each zone, and a common reproduction process can be performed in each zone. In particular, since the reproduction interval of the first reference data is the same in each zone, the gain adjustment of the reproduction system circuit based on this first reference data is performed in the same cycle in each zone, and the gain is always adjusted at the optimum interval. The data can be reproduced in a state where the adjustment is performed and the gain adjustment is always favorably performed, and the favorable data reproduction can be performed.

In the above embodiment, the zoning recording is divided into two zones, but it can be applied to the zoning recording divided into three zones or more than three zones. Further, the present invention is not limited to the above-mentioned embodiment, and needless to say, various other configurations can be adopted.

[0037]

According to the present invention, the recording state of the reference data is the same in each zone, even though the recording medium is a zoning-recorded recording medium, and the control based on the reference data is common to all the zones. It is possible to control the recording and reproduction with the same cycle in each zone, and dividing the zone does not complicate the control in the recording system circuit and the reproduction system circuit, and data with uniform characteristics regardless of the zone. Playback is possible.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a configuration of each track according to an embodiment.

FIG. 3 is an explanatory diagram showing a track configuration of a zone A according to an embodiment.

FIG. 4 is an explanatory diagram showing a track configuration of a zone B according to an embodiment.

FIG. 5 is an explanatory diagram showing a data structure of a zone A according to an embodiment.

FIG. 6 is an explanatory diagram showing a data structure of a zone B according to an embodiment.

FIG. 7 is a block diagram showing a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 8 is a configuration diagram showing a main part of a recording / reproducing apparatus of an embodiment.

FIG. 9 is a configuration diagram showing a main part of a recording / reproducing apparatus of an embodiment.

FIG. 10 is a timing chart for explaining an embodiment.

FIG. 11 is a timing diagram for explaining an example.

FIG. 12 is a schematic diagram for explaining zoning recording.

FIG. 13 is a schematic diagram for explaining zoning recording.

[Explanation of symbols]

1 Magneto-Optical Disk 4 System Controller 23 First PLL Circuit (Phase Locked Loop Circuit) 24 Second PLL Circuit 32 AGC Circuit (Automatic Gain Adjusting Circuit) 33 Amplitude Detection Circuit 34 Clock Phase Detection Circuit 35 Central Control Unit 39 Clock phase correction circuit

Claims (1)

[Claims] 1. A disk-shaped recording medium for rotating and recording / reproducing at a constant speed, dividing into a predetermined number of zones in a radial direction, and recording digital data of different clock rates in each zone. An area for recording a reference signal for managing the quality of the recording signal is provided in the above zone at a predetermined interval based on the clock of the recording data, and the clock of the recording data is also used as a reference in other zones. And a recording medium having areas for recording the reference data at the predetermined intervals.