JPH09161402A - Data recording / reproducing method, optical disc device, and optical disc recording medium - Google Patents

Abstract

(57) Abstract: A multi-zone CAV type optical disk device is improved so that the recording area of a magneto-optical disk can be effectively used and data can be recorded / reproduced with high reliability. SOLUTION: The sum of the recording capacities of recording zones 600 _k and 620 _k in an inner recording area 60 and an outer recording area 62 of an MO disk 6 is constant, and the difference between the shortest recording wavelength and the longest recording wavelength is minimized. Split so that In order to meet this condition, the recording zones 600 _k , 62 after division are divided.
0 relationship between the number T _k and the order k of the track of _k T _k = a +
bn (however, a = _Tall / 2n-n (n + 1) b / 2,
b is a proportional coefficient, T _all is the total number of tracks on the MO disk 6, and n is the number of divisions. The optical disc apparatus according to the present invention records / reproduces recorded data in parallel with the recording zones 600 _k and 620 _k .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing method for recording / reproducing data on / from an optical disk recording medium such as a magneto-optical disk, an optical disk device and an optical disk recording medium.

[0002]

2. Description of the Related Art Optical disk recording medium such as magneto-optical disk capable of recording and reproducing data (hereinafter referred to as "magneto-optical disk")
Is rotated at a constant angular velocity, the magneto-optical disk is divided into a plurality of recording zones at equal intervals in the radial direction, and data is recorded and reproduced (recording / recording) in each of these plurality of recording zones.
Multi Zone CAV (MZCAV; Multi Zo)
ne Constant Angular Velocity) type optical disc device is used.

For the above-mentioned optical disk device, there is a demand to effectively use a magneto-optical disk and record / reproduce data with high reliability. The present invention has been made in order to meet such a demand, and is a data recording / reproducing method which improves the MZCAV system and makes effective use of the recording area of a magneto-optical disk to record / reproduce data with high reliability. Another object of the present invention is to provide an optical disc device. Another object of the present invention is to provide an optical disc recording medium used in the data recording / reproducing method and the optical disc device according to the present invention.

[0004]

In order to achieve the above object, a data recording / reproducing method according to the present invention is directed to a recording area (radial direction) of an optical disc recording medium having recording tracks at equal intervals. An outer peripheral recording area) and an inner peripheral recording area (inner peripheral recording area) are divided into two recording areas, and the outer peripheral recording area and the inner peripheral recording area are each n in the radial direction (n is an integer). Recording zones, and each of the n recording zones is divided into one or more sectors at equal angles in the circumferential direction with respect to the center of the optical disc recording medium. It is rotated at a constant angular velocity, and at the data rate corresponding to each radius of the recording zone, the kth recording zone (k = 1, 2, ..., N) from the outer peripheral side of the outer peripheral recording area and the inner peripheral recording Inside of the area A data recording / reproducing method for recording data in parallel with a k-th recording zone, the recording capacity of the sector of the k-th recording zone from the outer peripheral side of the outer peripheral recording area, and the inner recording. The sum of the recording capacity of the sector of the k-th recording zone from the inner side of the area is constant, and the width of each of the recording zones is the difference between the longest recording wavelength and the shortest recording wavelength in the recording zone. Data to be recorded on the disc recording medium, which is determined to be minimum, is recorded from the recording capacity of the sector of the kth recording zone from the outer peripheral side of the outer peripheral recording area and the inner peripheral side of the inner peripheral recording area. The data amount is divided according to the recording capacity of the sector of the kth recording zone, and the divided data is recorded in each of these recording zones.

The optical disc recording medium used in the data recording / reproducing method according to the present invention has tracks having a constant pitch in the circumferential direction, and has two recording areas in the radial direction, that is, outer peripheral recording. It is divided into an area and an inner recording area. Further, each of these two recording areas is divided into n (n is an integer) recording zones in the radial direction, and a total of 2n of these recording zones are used to record data.
Will be played.

The above optical disc recording medium is rotated at a constant angular velocity, and the k-th recording zone (k = 1, 2, ..., From the outer peripheral side of the outer peripheral recording area at a data rate corresponding to each radius of the recording zone. n) and the data is recorded in parallel with the k-th recording zone from the inner circumference side of the inner circumference recording area.
Reproduce. That is, for example, the outer peripheral recording area is accessed from the outer peripheral side for recording / reproducing, and in parallel with this, the inner peripheral recording area is accessed from the inner peripheral side for recording / reproducing, thereby The data rate at the time of recording / reproducing is doubled as compared with the case where the data is divided into individual recording areas and not used.

Further, the length of the recording zone in the circumferential direction becomes shorter on the inner peripheral side, and the recording capacity becomes smaller. Therefore, for example, the recording capacity of the recording zone is set to be increased in proportion to the recording zone number m counted from the inner circumference side, and the sum of the recording capacities of two recording zones accessed in parallel is calculated. It is fixed so that the capacity of the buffer for buffering the data to be recorded / reproduced can be minimized.

Differently from the conventional case, the recording zones have different widths so as to minimize the difference between the longest recording wavelength and the shortest recording wavelength in the same recording zone. In this way, by minimizing the difference between the longest recording wavelength and the shortest recording wavelength, the difference in the recording characteristics within the same recording zone is minimized, and the recording area is effectively used.

Further, as described above, since data is recorded / reproduced in each recording zone at a data rate corresponding to the radius of the recording zone, eventually, in each of the outer peripheral recording area and the inner peripheral recording area. Does not need to change the recording format. Therefore, it is not necessary to change the recording format for each recording zone, and only the recording format needs to be changed only between the outer recording area and the inner recording area. In addition, two recording zones accessed in parallel with the data block of the data to be recorded,
By dividing and recording according to each recording capacity, the same data block is recorded / reproduced in parallel for each part at high speed.

Preferably, the data recording / recording according to claim 1
A data recording / reproducing method for reproducing data recorded on the optical disc recording medium by a reproducing method, wherein the data rate corresponds to each radius of the recording zone,
Data is read in parallel from the kth recording zone from the outer peripheral side of the outer peripheral recording area and the kth recording zone from the inner peripheral side of the inner peripheral recording area, and data is read from the outer peripheral side of the outer peripheral recording area in parallel. The data read from the sector of the kth recording zone and the kth recording area from the inner circumference side of the inner circumference recording area.
The data at the time of recording is restored from the data read from the sector of the second recording zone.

Preferably, the relationship between the width of the recording zone and the order of the zones is expressed as a linear function.

The optical disc device according to the present invention is an optical disc device for recording data on a predetermined optical disc recording medium, wherein the optical disc recording medium is provided in a circumferential direction. A track having a constant pitch, a recording area on the outer circumference side (outer circumference recording area) and a recording area on the inner circumference side (inner circumference recording area) that divide the optical disk recording medium into two in the radial direction, and the outer circumference. The recording area and the inner recording area are divided into n (n is an integer) recording zones that divide the outer recording area and the inner recording area in a radial direction, and the n recording zones are divided into circles. Direction, and one or more sectors divided at the same angle with respect to the center of the optical disc recording medium, and the k-th (k =
1, 2, ..., N), the sum of the recording capacity of the sector of the recording zone and the recording capacity of the sector of the k-th recording zone from the inner peripheral side of the inner recording area is constant, and The width of each recording zone is determined so that the difference between the longest recording wavelength and the shortest recording wavelength in the recording zone is minimized, and disk rotation driving means for rotationally driving the optical disk recording medium at a constant angular velocity, At a data rate according to each radius of the recording zone of the outer peripheral recording area,
Outer peripheral recording means for recording data from the outer peripheral side of the outer peripheral recording area to the kth recording zone, and a data rate corresponding to the radius of the recording zone of the inner peripheral recording area. And an inner circumference recording means for recording data in the kth recording zone from the circumference side in parallel with the data recording from the outer circumference side of the outer circumference recording area of the outer circumference recording means to the kth recording zone. .

Preferably, the data to be recorded on the optical disc recording medium is read from the outer peripheral side of the outer peripheral recording area at the k-th position.
A recording means for dividing the recording capacity of the sector of the th recording zone and a recording capacity of the sector of the kth recording zone from the inner circumference side of the inner recording area to the outer circumference. The recording means and the inner circumference recording means record the divided data in each of the recording zones.

Preferably, the relationship between the width of the recording zone and the order of the recording zones is expressed as a linear function.

Preferably, the optical disc device reproduces data recorded on the optical disc recording medium by the optical disc device, wherein the outer circumference is at a data rate corresponding to each radius of the recording zone. Data reproducing means for reproducing data in parallel from the sector of the kth recording zone from the outer peripheral side of the recording area and the sector of the kth recording zone from the inner peripheral side of the inner peripheral recording area; During recording from data reproduced from the sector in the kth recording zone from the outer peripheral side of the outer peripheral recording area and data reproduced from the sector in the kth recording zone from the inner peripheral side of the inner peripheral recording area And a data restoration means for restoring the data.

Further, the optical disc recording medium according to the present invention is an optical disc recording medium in which data is recorded / reproduced by being rotated at a constant angular velocity, and the tracks provided in the circumferential direction have a constant pitch. And an outer recording area (outer recording area) and an inner recording area (inner recording area)
2 recording areas divided in the radial direction, the outer recording area and the inner recording area each being divided into n recording areas (n is an integer) in the radial direction, and the n recording areas. Each zone has one or more sectors divided in the circumferential direction at the same angle with respect to the center of the optical disc recording medium, and the recording of the kth recording zone from the outer peripheral side of the outer peripheral recording area is performed. The sum of the capacity and the recording capacity of the k-th recording zone from the inner peripheral side of the inner recording area is constant, and the width of each recording zone is the longest recording wavelength and the shortest recording wavelength in the recording zone. A predetermined signal is precoded on the track to minimize the difference between

[0017]

BEST MODE FOR CARRYING OUT THE INVENTIONFirst embodiment Hereinafter, the first embodiment of the present invention will be described. Figure 1 is a book
It is a figure which shows the structure of the optical disc apparatus 1 which concerns on invention.
You. As shown in FIG. 1, the optical disc device 1 is
Read / write magneto-optical disk (MO disk
Recording signal processing for the inner recording area 60 (FIG. 2) of the disk 6
System 10₁, For the outer recording area 62 of the MO disk 6
Recording signal processing system 10 _Two, Common signal processing system 14, control circuit
Path (CPU) 30, servo system 40 and disk drive system
It is composed of 44.

The recording signal processing systems 10 ₁ and 10 ₂ are optical heads (OP HEAD) 100 ₁ and 100 ₂ and R, respectively.
It is composed of F circuits 130 ₁ and 130 ₂ . For simplification of the drawing, FIG. 1 shows only the configurations of the optical head 100 ₁ and the RF circuit 130 ₁ , but the configurations of the optical head 100 ₂ and the RF circuit 130 ₂ are also the same.

The optical heads 100 ₁ and 100 ₂ are a front monitor (FRONT MONITOR) 102, a laser diode (LD) 110, and an LD drive circuit (LD DRIVE) 11 respectively.
2. An RF signal detector (DETECTOR) 120 and a matrix circuit (MATRIX) 122. RF circuit 13
0 ₁ and 130 ₂ are LD output control circuit (FAPC) 1 respectively
32, a pulse train circuit 134, an equalization circuit (EQ) 140, and a phase synchronization circuit (PLL circuit) 14
It consists of two.

The common signal processing system 14 includes a modulation / demodulation circuit (CHANNEL CODE ENDEC) 16 and an ECC circuit (ECC ENDEC).
) 18, a buffer circuit (BUFFER) 20, a buffer control circuit (BUFFER CONTROL) 22, and an interface circuit (IF circuit; SPC) 24.

The servo system 40 is a servo circuit (SERVO) 4
00 and drive coil 42. The servo circuit 400 includes a servo control circuit (CPU) 402 and a signal processing circuit (DSP) 404. The drive coil 42 is
Focus coil 420, tracking coil
(Tracking) 422 and linear coil (Linear) 424.

The disk drive system 44 is an MO disk 6
For the inner recording area 60 (Fig. 2) of the
TOR) 440 ₁ , an actuator 440 ₂ for the outer peripheral recording area 62 of the MO disk 6, a spindle motor drive circuit (S
PINDLE DRIVE) 442, spindle motor (SPINDLE MOT
OR) 444 and deck mechanism system (MECHA-DECK Loader)
446.

FIG. 2 is a diagram for explaining the recording format and recording area of the sectors of the MO disk 6,
(B) shows the inner recording area 60 and the inner recording area 60 of the MO disk 6. As shown in FIG. 2B, the recording surface of the MO disk 6 is divided into, for example, two recording areas (inner peripheral recording area 60 and outer peripheral recording area 62) in the radial direction, and the tracks of the inner peripheral recording area 60 are divided. Tracks are formed in a spiral shape from the inner circumference side to the outer circumference side, and in the outer circumference recording area 62, spiral tracks are formed from the outer circumference side to the inner circumference side.

These tracks are equally spaced (pitch, eg 1.15 μm) on the entire recording surface of the MO disk 6.
A predetermined number (for example, 40000; T _all ), one track of the inner recording area 60 includes 56 sectors, and one track of the outer recording area 62 includes 56 sectors.

Inner circumference recording area 60 and outer circumference recording area 62
Are, for example, 10 (n = 1) in the radial direction.
0), the inner recording area 60 and the outer recording area 62 are combined.
20 recording zones 600 (m = 2 × n = 20)₀
~ 600₉(Recording zone 600 _k; K is an integer, 0 ≦ k ≦
n), 620₀~ 620₉(Recording zone 620_k) Minutes
Cracked. The recording zone 600₀~ 600₉You
And recording zone 620₉~ 620₀, In this order
And recording zone 640₁~ 640₂₀(Recording zone 640
_hAlso referred to as (1 ≦ h ≦ 20). In addition, each recording zone 64
0₁~ 640₂₀Is equal to the center of the MO disk 6
It is divided into sectors with a certain angle.

The optical disc device 1 (FIG. 1) has an MO disc 6 (FIGS. 1 and 2) due to these components.
(B)) is divided into a plurality of recording zones and is rotationally driven at a constant angular velocity to record / reproduce data.
(MZCAV; Multi Zone Constant Angular Velocit
By the y) method, data is recorded and reproduced (recorded / reproduced) by accessing in the order of the zone numbers shown in FIG.

That is, the optical disc apparatus 1 sequentially accesses the recording zone 600 _k of the inner recording area 60 of the MO disc 6 from the inner peripheral side (in the order of the recording zone 600 ₀ to the recording zone 600 ₉ ), The recording zones 620 _k of the outer circumference recording area 62 are sequentially arranged from the outer circumference side (recording zone 620 _k
Accessing from ₀ to the recording zone 620 ₉ ) is performed in parallel to the recording zone 600 _k and the recording zone 620 _k to record / reproduce data at different data rates.

The control circuit 30 is composed of, for example, a CPU having a RISC (Reduced Instruction Set Computer) configuration and the like, and an operation input via a cable such as an RS-232C connected to an external operation terminal. A buffer control circuit 22 of the data / common signal processing system 14,
Each component of the optical disk device 1 is controlled based on the data input from the IF circuit 24, the servo circuit 400, and the like.

The IF circuit 24 is input from a computer or the like connected to the outside in accordance with the SCSI protocol,
The data (recording data) recorded on the MO disk 6 is accepted and output to the buffer circuit 20. IF
The circuit 24 outputs the data (playback data) reproduced from the MO disk 6 and input through the buffer circuit 20 to an external computer or the like.

The buffer control circuit 22 controls the buffering operation of the buffer circuit 20 under the control of the control circuit 30. The buffer circuit 20 is the buffer control circuit 2
In accordance with the control of No. 2, the inner recording area 60 of the MO disk 6
And the outer peripheral recording area 62, and the ECC
The data (reproduction data D _600k , D _620k ) input via the circuit 18 is buffered, the original data at the time of recording is restored, and output to the IF circuit 24. Also,
The buffer circuit 20 buffers the recording data input from the IF circuit 24 and divides the recording data (D _{60 0k} , D _620k ) to be recorded in the inner recording area 60 and the outer recording area 62 into the ECC circuit 18. Output to.

The ECC circuit 18 adds an error correction code (ECC code) to the recording data input from the buffer circuit 20 and outputs it to the modulation / demodulation circuit 16. Also,
The ECC circuit 18 performs error correction processing using the ECC code included in the reproduction data input from the modulation / demodulation circuit 16, and outputs the error correction processing to the buffer circuit 20.

The modulation / demodulation circuit 16 modulates the recording data input from the ECC circuit 18 by a predetermined modulation method suitable for recording on the MO disk 6, and the inner recording area 60 and the outer circumference of the MO disk 6 are modulated. Signals (recording signals S _600k and S _620k ) to be recorded in the recording areas 62 are generated, and the RF circuits 13 of the recording signal processing systems 10 ₁ and 10 ₂ are generated.
It outputs to the pulse train circuit 134 of 0 ₁ and 130 ₂ .

The modulation / demodulation circuit 16 is the RF circuit 1
Clock signals CK ₁ generated by the PLL circuit 142 from the signals (reproduction signals S _600k and S _620k ) input from the optical discs 30 ₁ and 130 ₂ and reproduced from the inner recording area 60 and the outer recording area 62 of the MO disk 6, respectively. , Demodulated by a demodulation method corresponding to the modulation method at the time of recording in synchronization with CK ₂ ,
Reproduced data is generated and output to the ECC circuit 18.

The recording signal processing systems 10 ₁ and 10 ₂ are MO
Inner recording area 60 and outer recording area 62 of the disk 6
Recording signals are recorded and reproduction signals are reproduced for each of them. The RF circuits 130 ₁ and 130 _{2 of the} recording signal processing systems 10 ₁ and 10 ₂ respectively perform predetermined processing on the reproduction signal reproduced from the MO disk 6 and reproduce the clock signal.

In each of the RF circuits 130 ₁ and 130 ₂ , the pulse train circuit 134 is the modulation / demodulation circuit 1
A light emission timing signal for controlling the timing of laser light emission of the laser diode 110 is generated on the basis of the recording signal input from 6. LD output control circuit 132
Generates a control signal S132 for controlling the laser light intensity of the laser diode 110 on the basis of the intensity signal S102 indicating the laser light intensity of the laser diode 110 detected by the front monitor 102, and outputs the control signal S132 to the LD drive circuit 112. Output.

The equalizing circuit 140 includes an optical head 100 ₁ ,
The reproduction signal S122 input from the matrix circuit 122 of 100 ₂ is equalized and output to the PLL circuit 142. The PLL circuit 142 generates a clock signal synchronized with the reproduction signal input from the equalization circuit 140 and outputs it to the modulation / demodulation circuit 16.

Each of the optical heads 100 ₁ and 100 _{2 of the} recording signal processing systems 10 ₁ and 10 ₂ has an inner recording area 60 and an outer recording area 62 according to a light emission timing signal.
A laser beam is radiated to the laser beam to detect the intensity signal S102 indicating the intensity of the laser beam and the laser beam reflected from each of the inner recording area 60 and the outer recording area 62 to generate a reproduction signal S122. The circuit 130 ₁ ,
Output to 130 ₂ .

In each of the optical heads 100 ₁ and 100 ₂ , the LD drive circuit 112 includes an LD output control circuit 13
The laser diode 110 is driven based on the control signal S132 input from the device 2 to generate a laser beam to generate M
The O disk 6 is irradiated. Front monitor 10
2 detects the intensity of the laser light generated by the laser diode 110 and outputs it as an intensity signal S102 to the LD output control circuit 132.

The RF signal detector 120 is used for the MO disk 6
The laser light reflected by each of the inner recording area 60 and the outer recording area 62 is detected, converted into an electrical reproduction signal, and output to the matrix circuit 122. The matrix circuit 122 separates the servo signal (servo signal) from the reproduction signal input from the RF signal detector 120 and the reproduction signal containing the recorded data, and reproduces the reproduction signal as R.
The F circuits 130 ₁ and 130 ₂ output to the respective equalization circuits 140, and the servo signals are output to the servo circuit 400. Note that the signal lines between the matrix circuit 122 and the servo circuit 400 are omitted in FIG. 1 for simplicity of illustration.

In the servo system 40, the servo circuit 40
0 is the optical head 1 of the recording signal processing system 10 ₁ , 10 _2.
The focus coil 420, the tracking coil 422, and the linear coil 424 of the drive coil 42 are driven based on the servo signals input from the matrix circuits 122 of 00 ₁ and 100 ₂ .

Further, the servo circuit 400 includes the optical head 1
Laser diode 110 for each of 00 ₁ and 100 ₂
The focus control (focus control) of the laser light irradiating the inner circumference recording area 60 and the outer circumference recording area 62, and the laser light generated by the laser diode 110 are provided in the inner circumference recording area 60 and the outer circumference recording area 62, respectively. Servo control is performed to trace the track. Further, the servo circuit 400, based on the FG signal input from the spindle motor 444,
Control rotation of 4.

In the servo circuit 400, the signal processing circuit 404 is composed of, for example, a digital signal processor (DSP) or the like, and drives the focus coil 420, the tracking coil 422 and the linear motor coil 424 under the control of the servo control circuit 402. Signal S40
4 to the generation drive coil 42, and also controls the spindle motor drive circuit 442.
Is generated and output to the drive coil 42. The servo control circuit 402 is, for example, a RISC (reduced instruction set;
It is composed of a CPU having a Reduced Instruction Set Computer) configuration and controls the processing operation of the signal processing circuit 404 under the control of the control circuit 30.

The disk drive system 44 is the MO disk 6
The spindle motor 444 and the MO disk 6 are driven to rotate. In the disk drive system 44, the spindle motor drive circuit 442 operates according to the control signal S400 input from the servo circuit 400.
A drive signal to be supplied to 44 is generated. According to the drive signal S442 supplied from the spindle motor drive circuit 442, the spindle motor 444 moves the MO disk 6 at a constant angular velocity in a predetermined direction (for example, 1920 rpm, as shown in FIG.
Rotate in the counterclockwise direction in (B).

The deck mechanism system 446, under the control of the control circuit 30, starts the recording / reproducing with respect to the MO disc 6 and is mounted on the optical disc device 1.
The disk 6 is mounted on the shaft of the spindle motor 444.
In addition, the deck mechanism system 446 uses the spindle motor 44 when the recording / reproducing for the MO disk 6 is completed.
The MO disk 6 is removed from the axis of 4 and ejected to the outside of the optical disk device 1.

The optical disc in the first embodiment will be described below.
The operation of the disk device 1 will be described. First of all, for MO disk 6
A method of dividing the recording surface will be described. In the first embodiment
In addition, in the optical disc device 1, the recording zone 640
_hAll longest recording wavelengths and shortest recording wavelengths are equal, etc.
MO disk 6 (Fig. 1, Fig. 1)
2 (B)) recording zone 640_h(Recording zone 600 _k
And recording zone 620_k) Each minimum radius and
Maximum radius and recording zone 640_hRecord for each
・ Data rate during playback (recording / playback data rate)
Set the recording zone 640_hData for each
Record and play.

For the MO disk 6 under the condition 1 described above
When recording / reproducing data, the recording zone 640_h
Maximum and minimum radii of the recording zone 640
_hThe specified recording / playback data rate for each
Need to meet the requirements. This condition is the recording zone 640
_hMinimum radius R of each_hAnd maximum radius R_{h + 1}, And
And recording zone 640_hRecording / playback data for each
Tartrate RATE_hIs in the relation of the following formula.
The recording / playback data rate RATE _hIs the RF circuit
130₁, 130_TwoGenerated by each PLL circuit 142
Clock frequency CK₁, CK_TwoCorresponding to

[0047]

R ₂ / R ₁ = R ₃ / R ₂ = ... = R ₂₁ / R ₂₀ (1.1) RATE ₂ / RATE ₁ = RATE ₃ / RATE ₂ = ... = RATE ₂₁ / RATE ₂₀ (1.2) where, R _h, R _{h + 1} is a minimum radius and a maximum radius of recording zone 640 _h, rATE _h is a recording and reproducing data rate for recording zone 640 _h.

The above equation is the minimum radius R _h of recording zone 640 _h
(R _{1 to} R ₂₀ ) and recording / reproducing data rate RATE
It means that each of _h (RATE _{1 to} RATE ₂₀ ) is a geometric series. In addition, for easy understanding,
The minimum radius of the recording zone of the recording zone 640 _h 640 _h-1
Is the same as the maximum radius of (R _h ), and the recording zone 640
the same (R h _{+ 1)} is the maximum radius R _{h + 1} and the recording zone 640 h + ₁ of the smallest radius _h.

Next, the optical disc in the first embodiment will be described.
The recording operation of the disk device 1 will be described. Control circuit 30
(Fig. 1) controls the deck mechanism system 446 to be installed.
The rotary disk of the spindle motor 444 to the MO disk 6
Place it on. Further, the control circuit 30 controls the light from the inner circumference side.
Science head 100₁The recording zone 600 _kIs accessed
The optical head 100 in order from the outer peripheral side._TwoRecording zone 6
20_kControl the servo circuit 400 so that
I will. The servo circuit 400 follows the control of the control circuit 30.
Actuator 440₁, 440_TwoMove the light
Science head 100₁, 100_TwoRecording zone 600 for the purpose
_k, 620_k(640_k, 640_19-k) Access
You.

Recording data input from an external computer or the like is input to the buffer circuit 20 via the IF circuit 24. The buffer circuit 20 buffers the recording data under the control of the buffer control circuit 22 (control circuit 30), divides the recording data into proportions according to the recording capacities of the recording zones 600 _k and 620 _k , and records the recording data D _{60. It is} output to the ECC circuit 18 as _0k and D _620k .

The ECC circuit 18 uses the recording data D _600k , D
_An ECC is added to each _620k and output to the modulation / demodulation circuit 16, and the modulation / demodulation circuit 16 outputs the recording data D.
_600k, to modulate the respective D _620K outputs to the modulation and demodulation circuit 16. The modulation / demodulation circuit 16 modulates the recording data D _600k and D _620k in synchronization with the master clock signal to generate recording signals S _600k and S _620k, and outputs the recording signals S _600k and S _620k to the recording signal processing systems 10 ₁ and 10 _2, respectively. Output. The recording signal processing systems 10 ₁ and 10 ₂ write the recording signals S _600k and S _620k to the recording zone 600 _k of the inner recording area 60 and the recording zone 620 _k of the outer recording area 62 of the MO disk 6, respectively.

The reproducing operation of the optical disc device 1 according to the first embodiment will be described below. As in the case of the recording operation, the control circuit 30 causes the spindle motor 444 to rotate the MO disk 6 and causes the optical head 10 to rotate.
0 ₁ , 100 ₂ target recording zones 600 _k , 620 _k
To access.

The LD drive circuit 112 is a servo circuit 400.
Laser diode 1 according to the control signal S132 from
Driving zone 10 and recording laser beam for reading
600_k, 620_kIrradiate the truck. Recording zone
600_k, 620_kThe laser light reflected by the
Dead 100 ₁, 100_TwoEach RF signal detector 12
Detected by 0, converted into an electrical reproduction signal and matrix
Output to the circuit 122. Optical head 100₁, 1
00_TwoWhether each matrix circuit 122 is a reproduction signal
From the servo signal and the reproduction signal S122,
Servo circuit 400 and RF circuit 130, respectively₁, 130
_TwoTo the equalizer circuit 140.

The servo circuit 400 includes a focus coil 420 and a tracking coil 4 based on the servo signal.
Controls 22, actuator 440 _1, 440 ₂ optical head 100 ₁ through 100 ₂ recording zone 600
Trace to tracks _k and 620 _k . RF circuit 1
The equalization circuit 140 of each of 30 ₁ and 130 ₂ equalizes the reproduction signal S122 and outputs it as reproduction signals S _600k and S _620k to the PLL circuit 142 and the modulation / demodulation circuit 16. PL of each of the RF circuits 130 ₁ and 130 ₂
The L circuit 142 generates clock signals CK ₁ and CK ₂ synchronized with the reproduction signal S122 and outputs them to the modulation / demodulation circuit 16.

The modulation / demodulation circuit 16 reproduces the reproduced signal S _600k ,
Each S _620k is demodulated in synchronization with the clock signals CK ₁ and CK ₂ and _output as reproduction data D _600k and D _{620k to} the ECC circuit 18 of the common signal processing system 14. The modulation / demodulation circuit 16 uses the ECCs included in the reproduction data D _600k and D _600k, respectively, to reproduce the reproduction data D _600k and D _620k.
Each of them is error-corrected and output to the buffer circuit 20. The buffer circuit 20 uses the reproduction data D _600k and D _620k.
And the data at the time of recording are reproduced and output as reproduction data to the IF circuit 24. The IF circuit 24 outputs the reproduction data to the computer connected to the outside.

As shown in the first embodiment, the recording surface of the MO disk 6 is divided and used so that the shortest recording wavelength and the longest recording wavelength of all the recording zones are the same. It is possible to record / reproduce data with the same characteristics for all recording zones of. Therefore, by dividing and using the recording surface of the MO disk 6 as shown in the first embodiment, it is possible to improve the reliability of data recording / reproduction with respect to the MO disk 6.

Second Embodiment Below, a second embodiment of the present invention will be explained. The first embodiment shows a case where the recording surface of the MO disk 6 is divided and used so that the shortest recording wavelength and the longest recording wavelength of all recording zones are the same (condition 1).

However, in order to satisfy the condition 1, MO
When the recording surface of the disk 6 is divided, the recording zone 640 ₁
The minimum radius of ˜640 ₂₀ becomes geometric progression toward the outer peripheral side. On the other hand, the tracks are recorded zones 640 _{1 to} 640 _20.
Recording zone 60, because each is included at equal intervals
The sum of the recording capacities of 0 _k and 620 _k is not constant.

Therefore, when the storage capacity of the buffer circuit 20 is the largest (the recording zone 600
_0, it is necessary to match the 620 the sum of the recording capacity of _0),
The storage capacity of the buffer circuit 20 becomes larger than necessary.
Further, the control of the buffer circuit 20 by the buffer control circuit 22 also becomes complicated. Furthermore, the RF circuits 130 ₁ and 130
₍₂₎ The frequencies of the clock signals CK ₁ and CK ₂ generated by the respective PLL circuits 142 also increase geometrically as they go to the outer peripheral side, so that it is difficult to configure a stable circuit.

In order to solve such a problem, PL
Instead of the L circuit 142, recording zones 640 _{1 to} 640
_20. A crystal oscillator having a frequency corresponding to each recording / reproducing data rate is prepared, and a clock signal CK synchronized with the reproducing signals S _600k and S _620k by the PLL circuit 142.
It is possible to generate ₁ and CK ₂ , but this is not realistic because the circuit scale increases and the cost increases.

Further, the RF circuit 130₁, 130_TwoEach
The PLL circuit 142 is connected to the recording zone 600._k, 620
_kClock signal CK whose frequency is proportional to the minimum radius of₁,
CK _TwoConfigured to generate a recording zone 600
_k, 620_kThe shortest recording wavelength of
You. However, the clock signal C having such a frequency
K₁, CK_TwoRF circuit 130₁, 130_Twoeach
Configuring the PLL circuit 142 to generate is currently
Not practical.

The recording zone 640 _h (recording zone 6
When the number (h) of 00 _k and 620 _k is a very large number (for example, 100), it is possible to make the frequencies of the clock signals CK ₁ and CK ₂ proportional to the minimum radius of the recording zone 640 _h . However, the relationship between the signal processing, the number of recording zones 640 _h, it is not realistic to increase too greatly.

Further, these clock signals CK ₁ , CK
_When data is recorded in the recording zones 640 _{1 to} 640 ₂₀ (recording zones 600 _k and 620 _k ) using ₂ , it is necessary to change the sector recording format for each of the recording zones 640 _{1 to} 640 ₂₀ . However, the ratio of the number of bytes in the vertical and horizontal directions of the recording format (for example, 84 × 59 lines) cannot be freely changed, and it is not realistic to change the recording format.

On the contrary, when the optical disc apparatus 1 is configured to record / reproduce data by using different clock signals CK ₁ and CK ₂ and recording formats for each of the recording zones 640 _{1 to} 640 ₂₀ , the MO disc 6 However, the recording capacity of the MO disk 6 becomes small as a whole. In the second embodiment, an optical disc device 1 which solves the above problem will be described.

In the second embodiment, the MO disk 6 is
In order to minimize the storage capacity of the buffer circuit 20 and simplify the buffering control of the buffer circuit 20 by the buffer control circuit 22, the characteristics relating to recording / reproduction on the inner and outer circumference sides within the same recording zone. (Condition 2), the sum of the recording capacities of the recording zones 600 _k and 620 _k is constant, and the recording zone 640 _h is minimized so that the difference between the shortest recording wavelength and the longest recording wavelength is minimized. Is divided into

FIG. 3 shows recording zones 640 _h (recording zones 600 _k and 620) of the MO disk 6 shown in FIG. 2B.
It is a figure explaining the width of _k ). In order to satisfy the above condition 2, the inner recording area 60 and the outer recording area 62 of the MO disk 6 are divided into recording zones 600 _k and 620 _k after division.
The number of tracks T _k and the order k of the recording zones 600 _k and 620 _k may be divided so as to satisfy the linear function shown in the following equation. Since the pitch of the tracks of the MO disk 6 is constant, the width of the recording zone 640 _h is proportional to the number of tracks T _k.

[0067]

[Number 2] T _k = a + bn _{where, a = T all / 2n-} n (n + 1) b / 2, b is a proportionality coefficient, T _all is the total number of tracks of the MO disc 6, n is recording zone 600 _k, 620 _k Each number n
It is.

[0068] When determining the number of tracks included in each such record zone 640 _h (width), the recording zone 60
The sum of 0 _k and 620 _k is constant at 4000 lines. For example, if a = 1450 and b = 100, the recording zone 6
00 _0, 600 _1, the number T _k of tracks included in 600 _9, respectively 1550,1650, ..., becomes 2450, recording zone 620 _0, 620 _1, the number T _k of tracks included in to 620 _9, 2450 and 235 respectively
0, ..., 1550. Recording and reproducing clock against recording zone 640 _h, respectively, and the number of clocks needed in each sector, the time Ji response frequency for recording and reproducing for one sector. Therefore, the recording / reproducing clock for each recording zone 640 _h is
Different values for _h .

FIG. 2A is a diagram showing the recording format of each sector of the track of the MO disk 6. FIG.
As shown in (A) and (B), the tracks of the inner recording area 60 and the outer recording area 62 of the MO disk 6 are 62 (56; outside the parentheses are the numerical values of the outer recording area 62 at constant angles). , The parentheses indicate the values of the inner recording area 60).

As shown in FIG. 2A, the head of each sector has an address portion of 55 bytes (precoded) recorded in advance on the track of the MO disk 6. In this address part, a sector mark (SM), VFO1 data, AM1 data, ID1 data, VFO2 data, A
It is composed of M2 data, ID2 data, VFO3 data, AM3 data, ID3 data and PA data.

Among these data, the sector mark is an identifier indicating the beginning of the sector, the VFO1 to VFO3 data are data patterns used for PLL pulling of the address, and the AM1 to AM3 data are ID1 to ID3.
3 is a data pattern indicating a read start position of the. The ID1 data, ID2 data, and ID3 data further include track number data, sector number data, a CRC code and an end identifier (0
0h) is recorded.

Following the address part, ALPC data,
VFO4 data, data area (DATA AREA) and BU
The FFER area is recorded. The ALPC data is a trial writing area for determining the recording light amount. As the VFO4 data, data having the same content as the VFO1 to VFO3 data is written. In the data area, SYN for synchronization
After the C data, the data body (DATA) and the RE that requires resynchronization
The SYNC data is recorded alternately. The BUFFER area is an area for absorbing the rotation unevenness of the MO disk 6.

FIG. 4 and FIG. 5 are diagrams showing the frame structure of data recorded in the data area. As shown in FIGS. 4 and 5, the data recorded in the data area includes SYNC data (SY _{1 to} SY ₃ ), DATA,
The P and Q parity codes and the RESYNC data (RS ₁ , RS ₂ ) in the middle are set as the head (76+
8) It has a frame structure of words × (55 + 4) rows. 76 bytes of data body (D1 to D380) follows each data SYNC and RESYNC, and further ECC codes (P1 to P47) for these data.
2) continues for 8 bytes each. Further, the end identifier 00h is added at the end of the frame.

As described above, the recording zones 600 _k , 6
Since the sum of the recording capacities of 20 _k is constant, the optical disc device 1 buffers the recording data input from the outside and further divides the recording data according to the recording capacities of the recording zones 600 _k and 620 _k . The ratio of dividing the recording data is performed by a method of distributing the recording data to the recording zones 600 _k and 620 _{k for} each row (59) shown in FIG. 5, and the value of the dividing ratio is, for example, ( Data amount distributed to recording zone 600 _k : Data amount distributed to recording zone 620 _k ) = 20: 39, 21:38, ..., 2
It will be 9:30. With such a division ratio,
The sum of the recording capacities of the sectors of the recording zones 600 _k and 620 _k can be made constant.

Also, when the optical disc device 1 reproduces data from the recording zones 600 _k and 620 _k , the reproduced data reproduced from the recording zone 620 _k is buffered, and the data is reproduced from the recording zone 600 _k behind it. The original data at the time of recording can be reproduced by buffering the reproduced data reproduced.

The recording operation of the optical disk device 1 according to the second embodiment will be described below. The control circuit 30 (FIG. 1) rotates the MO disk 6, further causes the optical head 100 ₁ to access the recording zone 600 _k from the inner peripheral side, and sequentially accesses the optical head 100 ₂ to the recording zone 620 _k from the outer peripheral side. Let Recording data is input to the buffer circuit 20 from an external computer or the like via the IF circuit 24, and the buffer circuit 20 causes the recording zones 600 _k and 620 to pass.
_The division ratio (20:
39, 21:38, ..., 29:30), and the ECC circuit 18 divides the recording data into recording data D _600k and D _620k.
Output to

The ECC circuit 18 uses the recording data D _600k , D
_An ECC is added to each _620k and output to the modulation / demodulation circuit 16, and the modulation / demodulation circuit 16 outputs the recording data D.
_600k, to modulate the respective D _620K outputs to the modulation and demodulation circuit 16. The modulation / demodulation circuit 16 uses the recording data D _600k ,
_Generate recording signals S _{60 0k} and S _620k from D _620k ,
Recording signal processing system 10 _1, respectively 10 _2, the recording signal in parallel with respect to a sector of the recording zone 620 _k of the recording zone 600 _k sectors and the outer peripheral recording area 62 of the inner peripheral recording area 60 of the MO disk 6 S _600k , S _620k is written.

Next, the optical disc according to the second embodiment will be described.
The reproducing operation of the disc device 1 will be described. Place of recording operation
The control circuit 30 rotates the MO disk 6 in the same manner as described above.
Let the optical head 100₁, 100_TwoThe desired recording zone
600_k, 620_kTo access. LD drive circuit 1
12 drives the laser diode 110 for reading
Recording zone 600 of laser beam_k, 620_kThe tiger
To irradiate the lock. Recording zone 600_k, 620_kAnti
The emitted laser light is emitted from the optical head 100. ₁, 100_Two
Each RF signal detector 120 is electrically connected in parallel.
It is converted into a proper reproduction signal. Optical head 100₁, 100
_TwoThe matrix circuits 122 are arranged in parallel to reproduce the reproduction
The servo signal and the reproduction signal S122 from the
The circuit 140 equalizes the reproduction signal S122 in parallel.
You.

The modulation / demodulation circuit 16 demodulates the equalized reproduced signals S _600k and S _620k to _obtain reproduced data D _600k and D _620k . The modulation / demodulation circuit 16 performs error correction on each of the reproduction data D _600k and D _600k , and the buffer circuit 20 combines the reproduction data D _600k and D _620k and reproduces the data at the time of recording, and the data is reproduced via the IF circuit 24. Output to the outside.

Although the above-described embodiment shows the case where the number of recording zones is 20, the effect of the present invention becomes more remarkable when the number of recording zones is smaller. For example, as an example of the MO disk 6, the total number of tracks is 4000, the track pitch is 1.15 μm, and the number of divisions of the recording zone (2k).
20 and the redundancy of the inner recording area 60 is 1.319310.
3, the outer peripheral recording area 62 has a redundancy of 1.3041907,
Data capacity is 4.587500, transfer data rate is 5
8.72 Mbps, inner recording area 60 of MO disk 6
Radius of 50.0 mm to 73.0 mm, outer recording area 6
When the radius of 2 is 73.0 to 96.0 mm, the constant a of Expression 2 is about 1920, and the constant b is 33 (the state of the MO disk 6 of the second embodiment), the constant a of Expression 2 is about 2000. ,
The constant b is 0 (state of the MO disk 6 of the first embodiment)
Compared with the above case, the difference between the shortest recording wavelength and the longest recording wavelength is smaller by about 0.0015 μm.

On the other hand, when the number of divisions is 4, the constant a is 6000, and the constant b is 2000, and the other conditions are not changed (state of the MO disk 6 of the second embodiment), the constant a of the expression 2 is approximately The difference between the shortest recording wavelength and the longest recording wavelength is about 0.0051 μm smaller than in the case where 10000 and the constant b are set to 0 (state of the MO disk 6 of the first embodiment).

[0082]

As described above, according to the data recording / reproducing method and the optical disc device of the present invention,
By improving the MZCAV system and effectively using the recording area of the magneto-optical disk, it is possible to record / reproduce data with high reliability. The optical disc recording medium according to the present invention is suitable for the data recording / reproducing method and the optical disc device according to the present invention.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an optical disc device according to the present invention.

FIG. 2 is a diagram illustrating a recording format and a recording area of a sector of an MO disc.

FIG. 3 is a diagram for explaining the width of a recording zone of the MO disc shown in FIG.

FIG. 4 is a diagram showing a frame structure of data recorded in a data area.

FIG. 5 is a diagram showing contents of data recorded in a data area.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disc device, 10 ₁ , 10 ₂ ... Recording signal processing system, 100 ₁ , 100 ₂ ... Optical head, 102 ... Front monitor, 104 ... Outer code encoder circuit, 120
... RF signal detector, 122 ... Matrix circuit, 13
0 ₁ , 130 ₂ ... RF circuit, 132 ... LD output control circuit, 134 ... Pulse train circuit, 140 ... Equalization circuit,
142 ... Write address control circuit, 16 ... Modulation / demodulation circuit, 18 ... ECC circuit, 20 ... Buffer circuit, 22 ...
Buffer control circuit, 24 ... Interface circuit, 30
... Control circuit. 40 ... Servo system, 400 ... Servo circuit,
402 ... Servo control circuit, 404 ... Signal processing circuit, 42
... Servo system, 420 ... Focus coil, 422 ... Tracking coil, 424 ... Linear coil, 44 ... Disk drive system, 440 ₁ , 440 ₂ ... Actuator,
442 ... Spindle motor drive circuit, 444 ... Spindle motor, 6 ... MO disk, 60 ... Inner circumference recording area, 6
2 ... Outer peripheral recording area, 600 _k , 620 _k ... Recording zone

Claims (8)

[Claims] 1. An optical disc recording medium having recording tracks at equal intervals, and two recording areas in a radial direction, an outer peripheral recording area (outer peripheral recording area) and an inner peripheral side recording area (inner peripheral recording area). Divided into the outer circumference recording area and the inner circumference recording area,
It is divided into n (n is an integer) recording zones in the radial direction, and each of the n recording zones is divided into one or more sectors at an equal angle to the center of the optical disc recording medium in the circumferential direction. The optical disc recording medium is divided, and the optical disc recording medium is rotated at a constant angular velocity, and at a data rate corresponding to each radius of the recording zone, the k-th recording zone (k = 1, 2, , N) and a data recording / reproducing method for recording data in parallel with the k-th recording zone from the inner circumference side of the inner circumference recording area, wherein The sum of the recording capacity of the sector of the th recording zone and the recording capacity of the sector of the kth recording zone from the inner circumference side of the inner recording area is constant, and the width of each of the recording zones is Within the recording zone Data to be recorded on the disc recording medium is set so as to minimize the difference between the long recording wavelength and the shortest recording wavelength, and the recording capacity of the sector of the k-th recording zone from the outer peripheral side of the outer peripheral recording area. A data recording / reproducing method for dividing the data into an amount corresponding to the recording capacity of the sector of the k-th recording zone from the inner side of the inner recording area and recording the divided data in each of these recording zones. . 2. A data recording / reproducing method for reproducing the data recorded on the optical disc recording medium by the data recording / reproducing method according to claim 1, wherein the data corresponds to each radius of the recording zone. Data is read in parallel from the k-th recording zone from the outer peripheral side of the outer peripheral recording area and the k-th recording zone from the inner peripheral side of the inner peripheral recording area at a rate Data to be restored at the time of recording from the data read from the sector of the k-th recording zone from the side and the data read from the sector of the k-th recording zone from the inner circumference side of the inner recording area Recording / playback method. 3. The data recording / reproducing method according to claim 1, wherein the relationship between the width of the recording zone and the order of the zones is expressed as a linear function. 4. An optical disc device for recording data on a predetermined optical disc recording medium, wherein the optical disc recording medium comprises tracks arranged in a circumferential direction with a constant pitch, and the optical disc. The recording medium has an outer peripheral recording area (outer peripheral recording area) and an inner peripheral recording area (inner peripheral recording area) that divide the recording medium into two in the radial direction, and each of the outer peripheral recording area and the inner peripheral recording area is , N (n is an integer) recording zones that divide each of the outer recording area and the inner recording area in a radial direction, and each of the n recording zones is a center of the optical disk recording medium in a circumferential direction. And one or more sectors divided at an equal angle with respect to, and the k-th (k = 1, 2,
, N), the sum of the recording capacity of the sector of the recording zone and the recording capacity of the sector of the k-th recording zone from the inner peripheral side of the inner recording area is constant, and The width is determined so that the difference between the longest recording wavelength and the shortest recording wavelength in the recording zone is minimized, and a disc rotation driving unit that rotationally drives the optical disc recording medium at a constant angular velocity, and the outer peripheral recording area. Outer peripheral recording means for recording data in the kth recording zone from the outer peripheral side of the outer peripheral recording area at a data rate corresponding to each of the recording zone radii, and the radius of the recording zone of the inner peripheral recording area. At a data rate according to the above, from the inner circumference side of the inner circumference recording area to the kth recording zone, and from the outer circumference side of the outer circumference recording means to the kth recording zone. An optical disk device having an inner recording means for recording data in parallel with data recording. 5. The data to be recorded on the optical disc recording medium is recorded from the recording capacity of the sector of the k-th recording zone from the outer peripheral side of the outer peripheral recording area and from the inner peripheral side of the inner peripheral recording area. a dividing means for dividing the data amount according to the recording capacity of the sector of the k-th recording zone, wherein the outer peripheral recording means and the inner peripheral recording means record the divided data in each of the recording zones. Item 4
The optical disc device according to 1. 6. The optical disc device according to claim 4, wherein the relationship between the width of the recording zone and the order of the recording zones is expressed as a linear function. 7. An optical disc device for reproducing data recorded on the optical disc recording medium by the optical disc device according to claim 5, at a data rate corresponding to each radius of the recording zone. , The sector of the k-th recording zone from the outer circumference side of the outer circumference recording area and the k-th sector from the inner circumference side of the inner circumference recording area
Data reproducing means for reproducing data in parallel from the sector of the th recording zone; data reproduced from the sector of the kth recording zone from the outer peripheral side of the outer peripheral recording area; An optical disk device comprising: a data recovery means for recovering data at the time of recording from data reproduced from the sector of the k-th recording zone from the inner peripheral side. 8. An optical disk recording medium for recording / reproducing data by being rotated at a constant angular velocity, wherein a track provided in a circumferential direction and having a constant pitch, and a recording area on an outer peripheral side (outer peripheral recording area). ) And a recording area on the inner circumference side (inner circumference recording area) divided into two radial areas, and the outer circumference recording area and the inner circumference recording area, respectively.
A recording zone divided into n (n is an integer) in the radial direction, and one or more obtained by dividing each of the n recording zones in the circumferential direction at the same angle with respect to the center of the optical disc recording medium. And the recording capacity of the k-th recording zone from the outer peripheral side of the outer peripheral recording area and the recording capacity of the k-th recording zone from the inner peripheral side of the inner peripheral recording area are constant. The width of each of the recording zones is an optical disc recording medium in which a predetermined signal is precoded on the track so as to minimize the difference between the longest recording wavelength and the shortest recording wavelength in the recording zone.