JPH0554539A - Recording method and recording medium - Google Patents

Abstract

PURPOSE:To allow the simple execution of reproduction control when the disk- shaped recording medium is subjected to zoning recording. CONSTITUTION:Digital data of clock rates varying in respective zones are recorded on the disk-shaped recording medium formed with the plural zones A, B in its radial direction while the rotating speed is kept constant within the respective zones. Reference data for detecting the quality of recording signals and the data for the zone control are recorded in the prescribed one segment segmented by the data for servo control recorded at prescribed intervals in the tracks within the respective zones of the recording medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method and 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.

[0006]

However, when the zoning recording is performed in this way, the recording form is different in each zone, so it is necessary to switch various controls such as extraction of a reproduction clock at the time of reproduction in each zone. The control system was complicated.

In view of the above points, an object of the present invention is to provide a recording method and a recording medium capable of easily reproducing recorded data even when zoning recording is performed.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a disc-shaped recording medium having a predetermined number of zones formed in a radial direction is provided with at least a constant rotation speed in each zone and a different clock in each zone. In a recording method for recording rate digital data, reference data for detecting the quality of a recording signal in a predetermined one segment delimited by servo control data recorded at predetermined intervals on tracks in each zone of a recording medium. And data for zone control are recorded.

Further, the present invention is a disk which is divided into a predetermined number of zones in the radial direction, rotates at least at a constant speed in each zone for recording / reproducing, and records digital data of a different clock rate for each zone. -Shaped recording medium, servo control data is recorded on tracks in each zone at a predetermined interval, and reference data for detecting the quality of a recording signal is recorded in a predetermined segment delimited by the servo control data. An area and a data recording area for zone control are provided.

[0010]

According to the recording medium recorded by the recording method of the present invention, in the case of zoning recording, reference data for detecting the quality of the recording signal and zone control are recorded in at least one segment divided by the servo control data. And data for zone control are recorded, and reproduction control of the zoning-recorded data using the data for zone control can be appropriately performed corresponding to each 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 is recorded / reproduced at a constant rotation speed in each zone,
In this example, zoning recording is performed in which the recording 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 data area of 20 bytes (for zone A) or 30 bytes (for zone B). 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. Data is recorded in the 20-byte or 30-byte data area following the servo byte by a magneto-optical effect by a circuit having a configuration described later. This 20
The difference in recording capacity between bytes and 30 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. With such a setting, the recording capacity of the data area is set. Changes from zone to zone.

Then, in the case of zone A, as shown in FIG. 3, 33 sectors form one sector, and one track forms 30 sectors. Further, in the case of zone B, as shown in FIG. 4, 22 sectors form one sector, and one track forms 45 sectors. In this case, 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.

When data is recorded, this sector is used as a unit. As for the structure of each sector, in the case of zone A, as shown in FIG. 5, the data area of the first segment (first segment) of the 33 segments forming one sector is set as the reference area. 20-byte reference data (reference data) is recorded when data is recorded in the sector. This reference data is for detecting the quality of the recording signal at the time of reproduction,
Specifically, a signal of a constant frequency is recorded, the reproduction level of the reference data is detected during reproduction, the gain is adjusted, and the system clock and the reproduction data are synchronized with each other. It is recorded in all sections of the area. In the data areas from the second segment to the 33rd segment, 20 bytes of data are recorded in each segment.

Therefore, in the case of zone A, one sector
20 bytes of reference data and 640 bytes (20 bytes × 32 segments) of various data are recorded.

In the case of zone B, as shown in FIG. 6, 1/3 of the first half of the data area of the first segment (first segment) of the 22 segments forming one sector corresponds to 10 bytes. A zoning information area having a capacity of 1 byte and a low recording density (that is, a normal 1
Data for zone control relating to zoning recording of a maximum of 10 bits is recorded at a recording density of / 8). Then, the latter half 2/3 of the data area of the first segment following this zoning information area is used as a reference area, and 20 bytes of reference data is recorded when data is recorded in this sector. The reference data of the zone B is the same as the reference data of the zone A described above. In the data area from the second segment to the 22nd segment, 30 bytes of data are recorded in each segment.

Therefore, in the case of zone B, one sector
10-byte zone control data (actually, the recording density is reduced to 1/8 for 10-bit data)
, Reference data of 20 bytes, and various data of 630 bytes (30 bytes × 21 segments) are recorded.

Thus, in zone A and zone B, 1
The storage capacities of the sectors are almost the same, and the zone B has a larger storage capacity of one track because the number of sectors of each track is larger in the zone B.

Here, the first of each sector in the case of zone B
An example of data recorded in the zoning information area of a segment is shown in FIG. 7. In this example, a zoning information area having a recording capacity of 10 bytes has a low recording density with 1-byte area being 1 bit, Data for zone control up to 10 bits is recorded, zone number data is recorded in the first 5 bytes of this zoning information area, and zone number data is recorded in the latter 5 bytes.
As the zone number data, data of the number of zone divisions of this disc is recorded. For example, in the case of two divisions as shown in FIG. 1, data of the number of zones 2 is recorded. In this case, since up to 5 bits can be recorded, a maximum of 32 types of zone number data can be recorded. The example of FIG. 7 shows an example of data in the case of four types of zone numbers 2, 4, 8 and 16. In this case, it is possible to record with 4 bits and record other data with the remaining 1 bit.

As zone number data, data indicating which zone the sector in which this data is recorded corresponds to is recorded. For example, in the case of two divisions as shown in FIG. 1, the zone number 1 ( Zone A) or zone number 2 (zone B) is recorded. However, in the case of zone A, there is actually no zoning information area, so only zone number 2 is recorded in zone B. In this case, since up to 5 bits can be recorded, a maximum of 32 types of zone number data can be recorded. In the example of FIG. 7, data examples of zone numbers 1 to 16 are shown. Also in this case,
Recording can be performed with 4 bits, and other data can be recorded with the remaining 1 bit. In the reference area following the zone number data recording area, information of about 8 bits is recorded in 1 byte.

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

FIG. 8 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. 9 and FIG. 10 show the detailed structure of the read circuit 15 and its surroundings necessary for reproduction. In this example, the magneto-optical disk 1 is zoning-recorded into two zones. Therefore, two types of read clocks are required. That is, FIG. 9 shows the configuration of the clock generation circuit. The reproduction signal supplied to the read circuit 15 obtained at the terminal 21 is supplied to the clock pit extraction circuit 22. To extract. 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 the input data into a signal having a frequency of 192 times.
A signal having twice the frequency is supplied to the terminal 25 as a zone A data detection clock. In addition, the second PLL circuit 2
4 is (192 × 1.5) times the input data, that is, 288
This is a circuit for making a signal of double frequency, and this signal of 288 times frequency is used as a clock for data detection of zone B in terminal 2
Supply to 6.

The configuration 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 5 is supplied to the AGC circuit (automatic gain adjustment circuit) 32, the amplitude detection circuit 33, and the clock phase detection circuit 34. 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. Also, based on the supplied clock phase detection data, create correction data for the read clock,
This correction data is supplied to the clock phase correction circuit 39. The clock phase correction circuit 39 has terminals 25 and 2
The phase of the data detection clock obtained in 6 is adjusted (phase shifted) based on the correction data, and one of the adjusted clocks is supplied to the data detection circuit 38.

In this case, the clock to be 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 192 in the first PLL circuit 23 becomes the system clock and the read clock at the same frequency. .. Further, at the time of reproducing the track of the zone B, as shown in FIG. 6, the reproduction data of the servo byte is multiplied by 192 in the first PLL circuit 23 and becomes a system clock for performing control based on the servo byte. , 288 times the second PLL circuit 24 becomes the read clock.

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.

Further, a terminal 36 indicates a terminal to which the reproduction signal of the data recorded in the pit, that is, the servo byte is supplied. The reproduction signal obtained at this terminal 36 is supplied to the 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 process is performed at the timing shown in. That is, as shown in FIG. 11A, while the reference data of the first segment of each sector is being reproduced, the amplitude detection circuit 33 detects the reproduction amplitude of the reference data as shown in FIG. 11B, and as shown in FIG. 11C. First, the clock phase detection circuit 34 detects the reproduction phase of the reference data. Then, when reproducing the servo bytes of the second segment, as shown in FIG. 11D, the central control unit 35 judges the reproduction amplitude and the reproduction phase, and the gain adjustment amount and the clock phase in the AGC circuit 32 are determined. The amount of phase correction in the correction circuit 39 is controlled. Then, in the state where the gain adjustment and the phase correction are performed in this manner, as shown in FIG.
As shown in 1E, the data recorded in the data area from the second segment is decoded. Based on the data reproduced from the servo byte of each segment, 1
Sample servo control is performed for each segment.

Then, when the reference data is reproduced by reproducing the next sector, the gain adjustment and the phase correction are readjusted (recorrection) based on the reference data in the same manner.
The reproduction state is adjusted (corrected) for each sector based on the reference data.

In this case, in this example, the zoning information area of zone B is arranged in front of the reference area, and 20 bytes are set in the first segment of each sector regardless of whether the reproduction track is zone A or zone B. After the reference data is recorded, only the target data is recorded in all data areas, so if the servo byte is ignored, the reference data and the target data will be the same in each zone. As a result, common playback control can be performed in each zone, and the playback process can be performed with simple control despite the zoning recording.

Further, since the reference area of the zone B of the first segment is 20 bytes aligned with the reference area of the zone A, a zoning information area is provided in the remaining 10-byte area to store data for zone control. By recording the data, the zoning state and the zone number of the reproduction point can be known from the data in this area, and the reproduction control corresponding to the reproduction zone can be performed. In this case, since the data recorded in the zoning information area has a low recording density that records data bit by bit in the area of 1 byte, even if the read clock of the reproduction system circuit is not synchronized with the recording signal. The reproduction data can be sufficiently discriminated, and there is no inconvenience even if the reproduction data is recorded before the reference data.

Although the zoning information area is provided before the reference data in the above embodiment, it may be provided in the same segment after the reference data. In this case, since the zoning information is read after the synchronization with the reference data is performed at the time of reproduction, it is not necessary to record at a low recording density as in the above embodiment. However, in this case, the arrangement state of the reference data and the target data (that is, the presence or absence of zoning information between both data)
However, it differs depending on the zone, and it is necessary to take measures for this.

Further, in the above-mentioned embodiment, the information on the number of zones and the zone number is recorded in the zoning information area, but information on other recording modes may be recorded.

Further, in the above embodiment, the zoning recording is divided into two zones, but three zones or three zones are used.
It can also be applied to zoning records divided into zones or more.
Further, the present invention is not limited to the above-mentioned embodiment, and needless to say, various other configurations can be adopted.

[0038]

According to the present invention, reference data for detecting the quality of a recording signal and data for zone control are recorded in at least one segment delimited by servo control data. The reproduction control of the zoning-recorded data using the above data can be performed well corresponding to each zone.

[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 an explanatory diagram showing a data configuration example of a zoning information area according to an embodiment.

FIG. 8 is a configuration diagram showing a recording / reproducing apparatus according to an embodiment of the present invention.

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

FIG. 10 is a configuration diagram showing a main part of a recording / reproducing apparatus of 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 (2)

[Claims] 1. A recording for recording digital data of a different clock rate in each zone on a disc-shaped recording medium having a predetermined number of zones formed in a radial direction while keeping a rotation speed constant in at least each zone. In the method, reference data for detecting the quality of a recording signal and zone control for zone control are provided in a predetermined one segment divided by servo control data recorded at predetermined intervals on tracks in each zone of the recording medium. A recording method that records data and data. 2. A disc-shaped recording which is divided into a predetermined number of zones in the radial direction, rotates at least in each zone at a constant speed for recording / reproducing, and records digital data of a different clock rate for each zone. In the medium, servo control data is recorded on tracks in each zone at a predetermined interval, and a reference data recording area for detecting the quality of a recording signal is provided in a predetermined segment divided by the servo control data. , A recording medium provided with a data recording area for zone control.