JP2000011562A - Disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a suppressing rate of external disturbance by synthesizing a sine wave generated from a sine wave generating means to supply it to an actuator driving means and making a recording/reproducing head follow up to the external disturbance synchronized to the rotation of a disk-like recording medium. SOLUTION: Servo pits inscribed on an optical disk 1 are read out by a pickup 2, and based on these data, tracking error signals are produced in a tracking error signal detector 4. The tracking error signals are made to AFC input signals and multiplied respectively by cosine wave data from a cosine wave table 93 and by sine wave data from a sine wave table 94 in multipliers 95, 96, then cumulatively added respectively in cumulating adders 99, 100 after appropriately amplified by amplifiers 97, 98. The cumulatively added values are multiplied by the cosine wave, sine wave data in multipliers 101, 102 and made to AFC output signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, there has been proposed a disk recording / reproducing apparatus for recording / reproducing information signals on / from various disk-shaped recording media such as an optical disk, a magneto-optical disk, and a magnetic disk. As shown in FIG. 4, such a disk recording / reproducing apparatus includes a pickup 2 serving as a recording / reproducing head for optically writing and reading information signals on / from an optical disk 1 which is a disk-shaped recording medium. The optical disc 1 is held at the center, and is rotated by a spindle motor 19. In this disc recording / reproducing apparatus, the pickup 2 moves the position of writing / reading an information signal to / from the optical disc 1, that is, the irradiation position of the light beam on the optical disc 1 by the pickup 2 in the radial direction of the optical disc 1. A two-stage actuator is provided with a slide motor 8 for moving the whole of the pickup 2 and a voice coil motor 3 for moving only the objective lens in the pickup 2. That is, the movement of the light beam irradiation position over a long distance is performed by the slide motor 8, and the fine positioning is performed by the voice coil motor 3.

In the pickup 2, a tracking operation is performed to make the irradiation position of the light beam follow a recording track formed on the optical disk 1. That is, the servo pits carved on the optical disc 1 are read by the pickup 2 and sent to the tracking error signal detector 4. The tracking error signal detector 4 generates a tracking error signal based on the servo pit read signal. A control current is generated by the phase compensation drive amplifier 5 based on the tracking error signal. By driving the voice coil motor 3 with this control current, the irradiation position of the light beam by the pickup 2 is positioned on the recording track.

In this disk recording / reproducing apparatus, as shown in FIG. 5, a CLV (constant linear velocity) servo is performed for controlling the rotation speed of the spindle motor 19. The CLV servo is executed by reading out the frequency of a signal recorded on the optical disc 1 which is proportional to the rotation speed of the optical disc 1, and adjusting this frequency to a reference frequency.

That is, in this disk recording / reproducing apparatus, data read from the optical disk 1 by the pickup 2 is demodulated by the demodulator 10. Demodulator 1
The data demodulated at 0 is synchronized by the PLL circuit 11 to generate a write clock. Based on this write clock, data demodulated by the demodulator 10 is written to a RAM (memory) 12. On the other hand, based on a read clock generated from crystal oscillator 13, data written in RAM 12 is read, and DA
Output via converter 14. Then, the write clock generated by the PLL circuit 11 is frequency-divided by the frequency divider 15 to, for example, 1 / N1. On the other hand, the quartz oscillator 1
3 is divided by the frequency divider 16 into, for example, 1 / N2. The phase error of the two clocks thus divided is detected by the phase detector 17. The phase error detected by the phase detector 17 is fed back to the rotation speed of the spindle motor 19 via the spindle driver 18. By this feedback, the frequency ratio between the write clock and the read clock is always kept constant. Then, by fixing the frequency of the read clock, the linear velocity of the portion of the optical disc 1 where the light beam is irradiated by the pickup 2 is controlled to be constant.

[0006]

By the way, in the above-mentioned disk recording / reproducing apparatus, in order to follow a disturbance synchronized with the rotation frequency of the spindle motor including eccentricity, a wide-band servo must be applied. Is performed, and a filter for following such a disturbance, that is, a disk rotation synchronous disturbance elimination filter is hardly used. This is because the rotation frequency of the spindle motor changes according to the position of the pickup, and the appearance frequency of the disk rotation synchronous disturbance also changes according to the change, so that it is difficult to configure the filter.

However, in a disk recording / reproducing apparatus, as the track pitch on a recording disk becomes narrower, it is necessary to secure a disturbance suppression rate.

In a disk recording / reproducing apparatus using a magnetic disk as a disk-shaped recording medium, for example, as disclosed in Japanese Patent Application No. 10-3325, it is necessary to introduce a disk rotation synchronous disturbance elimination filter. Have been. However, this is because in a disk recording / reproducing apparatus using a magnetic disk, the magnetic disk is rotated at a constant angular velocity (CAV), and the rotation speed of the spindle motor does not change depending on the position of the pickup.

Therefore, the present invention has been proposed in view of the above situation, and has a disk recording / reproducing apparatus employing a CLV servo or a zone CAV servo in which the rotation speed of a spindle motor changes according to the position of a pickup. In this regard, it is an object of the present invention to provide a disk recording / reproducing apparatus in which a disk rotation synchronous disturbance elimination filter is introduced so that a sufficient disturbance suppression rate can be secured.

[0010]

In order to solve the above-mentioned problems, a disk recording / reproducing apparatus according to the present invention is provided as a disk rotation synchronous disturbance suppressing filter for suppressing a specific order component of disk rotational synchronous disturbance. A device for compensating one or more disk rotation synchronization order components (Adap
A CLV type disk recording / reproducing apparatus having a tive feel forward canceller (AFC) and positioning a recording / reproducing head on a predetermined track on a disk-shaped recording medium.

That is, a disk recording / reproducing apparatus according to the present invention comprises: a spindle motor for rotating a disk-shaped recording medium; and a recording / reproducing apparatus for recording / reproducing information signals on / from the disk-shaped recording medium rotated by the spindle motor. A reproducing head; an actuator for moving the recording / reproducing head to an arbitrary radial position on the disk-shaped recording medium; an actuator driving means for driving the actuator; a control means for controlling the actuator driving means; And a sine wave generating means for generating a sine wave synchronized with the rotation frequency of the disk-shaped recording medium.

The control means synthesizes the sine wave generated by the sine wave generation means and supplies the sine wave to the actuator driving means so that the recording / reproducing head follows a disturbance synchronized with the rotation of the disk-shaped recording medium.

As the disk-shaped recording medium, a medium in which a signal recording area is divided into a plurality of zones in the radial direction may be used. In this case, the disk rotation control means controls the rotation angular velocity of the disk-shaped recording medium to be constant for each zone to which the position of the recording / reproducing head belongs.

The sine wave generating means can be constituted by a counter and a sine wave data table.

A device for compensating a disk rotation synchronous order component (Adaptive Feeldforward Canceller) (hereinafter, AFC)
Japanese Patent Application No. 10-3)
As described in the specification of No. 325, the control target is P (s) 21 as shown in FIG. For this controlled object P (s), a periodic disturbance d (t) 34
It is assumed that there is. For simplicity, this periodic disturbance d
If the frequency of (t) is ωi / 2π, the periodic disturbance d
(T) is expressed by the following equation (1).

[0016]

(Equation 1)

First, the multiplier 23 adds cos (ωit + Φ) to the output y (t) 22 of the control target P (s) 21.
By multiplying by i) and integrating the multiplication result by the integrator 25, an AFC coefficient ＾ ai27 is generated. This AF
The C coefficient ＾ ai27 is converted by a multiplier 29 into cos (ωi
t) and sent to the adder 31. Similarly, the output y (t) 22 of the control target P (s) 21 is multiplied by sin (ωit + Φi) by the multiplier 24, and the multiplication result is integrated by the integrator 26, thereby generating the AFC coefficient ＾ bi28. . This AFC coefficient ＾ bi28 is calculated by the multiplier 30
Is multiplied by sin (ωit) and sent to the adder 31. The output u (t) 32 of the adder 31 is
At 3, it is reduced from the periodic disturbance d (t). The output obtained by subtracting the output u (t) from the periodic disturbance d (t) is the control target P
(S). Here, Φi is the control target P (s)
Transfer function from AFC addition point of 21 to AFC drop-in point,
That is, the phase value at the frequency ωi / 2π of the transfer function from the output u (t) to the output y (t) is set.

The output u (t) 32 of the adder 31 is expressed by the following equation (2).

[0019]

(Equation 2)

At this time, each AFC coefficient ＾ ai27, ＾ b
When i28 converges to ai and bi, the periodic disturbance d
(T) 34 is an adder 33 serving as a disturbance addition point.
It is canceled by the output u (t) 32.

The operation in the AFC is actually performed in a digital operation unit (DSP). In this case, the AFC coefficients ＾ ai27 and ＾ bi28 are updated in accordance with the update rules shown in Expressions 3 and 4 below.

[0022]

(Equation 3)

[0023]

(Equation 4)

Here, k is an integer indicating the sampling time, and T is a sampling interval. At this time, as shown in FIG. 7, the digital AFC Ci (z) 41 is
It becomes like the following formula.

[0025]

(Equation 5)

That is, as shown in FIG. 7, when the control target is P (z) 40, the basic configuration of the AFC is that the periodic disturbance D (z) 42 having the frequency ωi / 2π
(Z) 40 and output Y of this control target P (z).
(Z) 43 is input to the digital AFC 41, and the output U (z) 44 of the digital AFC 41
(Z) 42.

FIG. 8 shows a disk recording / reproducing apparatus constructed using AFC and using a magnetic disk.
The magnetic disk 60 is driven to rotate by a spindle motor 61 as shown in FIG. On the magnetic disk 60,
Servo information is recorded or marked in advance.

As a method of recording the servo information, for example, a data area is divided at equal angles, and a plurality of servo areas extending radially from the center of the magnetic disk 60 are provided between the data areas. In the case of a so-called data surface servo system for recording servo information in this servo area, or in a large-capacity disk recording / reproducing apparatus using a plurality of magnetic disks, one of the plurality of magnetic disks is used. There is a so-called servo surface servo method in which one surface of a magnetic disk is used as a recording surface dedicated to servo information, and servo information is recorded on the entire recording surface.

A magnetic head 62 for recording and reproducing information signals on and from a magnetic disk 60 is driven by an actuator 63 continuously or intermittently. The actuator 63 is a so-called voice coil motor (VCM)
It is configured using

The servo information read from the magnetic disk 60 by the magnetic head 62 is amplified by a preamplifier 64, digitized by an A / D converter 65, and sent to a position error signal generator 66. The position error signal generator 66 generates a position error signal (PES) 67 indicating a deviation from the target position of the magnetic head 62 based on the transmitted servo information. This position error signal 67 is
A switch (SW1) operated by a control mode switching signal 78 sent from the control mode switch 77.
According to the switching state of 69, the tracking controller 7
0, settling controller 71 or seek controller 7
2 is input. Each of these controllers calculates a drive output 74 of the actuator 63 to the voice coil motor in accordance with the sent position error signal 67. The drive output 74 to the voice coil motor is sent to a D / A converter 75 through a switch (SW2) 73 switched by a control mode switching signal 78 sent from a control mode switch 77. The drive output to the voice coil motor, which has been analog-converted by the D / A converter 75, is passed through the voice coil motor driver 76 to the actuator 63.
Is supplied to the voice coil motor.

In this disc recording / reproducing apparatus, the AFC input signal 80 drawn from the position error signal 67 is switched according to the control mode switching signal 78 sent from the control mode switch 77 (S).
W3) is sent to AFC through 81. Here, AF
As C, AFC that cancels the first to fourth order components of the disk rotation synchronous disturbance is used. That is,
This AFC has C1 (z) 82, C2 (z) 83, C3
(Z) 84 and C4 (z) 85.

Therefore, assuming that the rotation frequency of the magnetic disk 60 is ω / 2π, the following equations 6 to 9 are obtained.

[0033]

(Equation 6)

[0034]

(Equation 7)

[0035]

(Equation 8)

[0036]

(Equation 9)

AFC C1 (z) 82, C2 (z) 8
3, the AFC output 88 calculated by C3 (z) 84 and C4 (z) 85 is added by the adder 86, and the control mode switching signal 7 sent from the control mode switch 77
The signal is sent to the adder 68 through a switch (SW4) 87 which is switched by 8. The AFC output 88 is added to the position error signal 67 by the adder 68 and sent to the controllers 70, 71, 72.

Here, the switches before and after the AFC (SW)
3) 81 and (SW4) 87 are turned on only at the time of tracking, and turned off at the time of other settling or seeking. Therefore, the AFC output 88 is output only at the time of tracking, and the tracking controller 7
Only sent to 0.

In such a disk recording / reproducing apparatus, the CLV in which the frequency of occurrence of disturbances synchronized with the disk rotation varies.
Type or zone CAV type servo operation, by using an AFC that changes the compensation frequency according to the change in the disk rotation frequency, a specific disk rotation synchronization order component can be removed stably, A high disturbance suppression rate can be secured.

[0040]

Embodiments of the present invention will be described below with reference to the drawings.

The disk recording / reproducing apparatus according to the present invention provides a CLV type servo in which the linear velocity at a position corresponding to a recording / reproducing head on a disk-shaped recording medium is constant, or a signal recording area of a disk recording medium is concentric. When performing a zone CAV type servo that rotates at a constant angular velocity for each zone formed by dividing into a plurality of zones, a disk rotation synchronous disturbance removal filter that removes a specific order component of the disk rotation synchronous disturbance is used. It is composed. As a disk rotation synchronous disturbance suppression filter for suppressing a specific order component of the disk rotation synchronous disturbance, a device (Adaptive FeeldforwardCanceller) (hereinafter, referred to as AFC) for compensating one or a plurality of disk rotation synchronous order components. Used.

[First Embodiment] In this disk recording / reproducing apparatus, as shown in FIG. 1, data read from an optical disk 1 as a disk-shaped recording medium by a pickup 2 as a recording / reproducing head is demodulated. Demodulated by the demodulator 10. The data demodulated by the demodulator 10
Synchronization is performed by the LL circuit 11, and a write clock is generated.

On the other hand, the crystal oscillator 13 generates a read clock. These two clock signals are CL
The data is input to the V controller 90 and phase comparison is performed. The phase error signal output from the CLV controller 90 is fed back to the spindle driver 18. By driving the spindle motor 19 by the spindle driver 18, the linear velocity at a position corresponding to the pickup 2 of the optical disk 1 is controlled to be constant.

A signal (so-called FG) synchronized with the rotation speed of the spindle motor 19 is sent from the spindle driver 18.
Etc.) are output. This rotation synchronization signal is used as it is, or the rotation synchronization signal is appropriately multiplied or divided by a multiplier or a frequency divider 91, and is multiplied by a constant multiple of the disk rotation frequency, for example, M times. A clock signal having a frequency can be obtained. The counter 92 is incremented based on this clock signal.
The counter 92 counts up from 0 to M−1, and is cleared to 0 by M.

On the other hand, a cosine wave table 9 having M data
3 and a sine wave table 94 are prepared on the memory. In these tables, M data for one cycle of a cosine wave and one cycle of a sine wave are stored in a memory space from addresses 0 to M-1. From these tables, counter 9
The data at the address indicated by No. 2 is referenced and output. As a result, cosine wave and sine wave data constantly synchronized with the disk rotation speed can be obtained.

Then, the servo pits engraved on the optical disk 1 are read by the pickup 2, and the tracking error signal detector 4 generates a tracking error signal based on the read data. This tracking error signal becomes an AFC input signal, and is output from multipliers 95 and 9.
At 6, the signals are multiplied by the cosine wave data from the cosine wave table 93 and the sine wave data from the sine wave table 94, respectively, appropriately amplified by the amplifiers 97 and 98, and further accumulated by the accumulators 99 and 100, respectively. Is added. Each cumulative addition value is calculated by the multiplier 10
At 1, 102, the data is further multiplied by cosine wave data and sine wave data, and added at an adder 103.
AFC output signal.

The AFC output signal is added to the tracking error signal in the adder 104 and sent to the phase compensation drive amplifier 5. The phase compensation drive amplifier 5
A voice coil motor (VCM) that generates a control current based on a signal obtained by adding the AFC output signal and the tracking error signal and constitutes an actuator of the pickup 2
Supply 3 When the voice coil motor 3 is driven, the pickup 2 positions the irradiation position of the light beam on the recording track. The control current generated by the phase compensation drive amplifier 5 has a DC component detected by a DC detection circuit 6 and is supplied to a slide motor 8 via a power amplifier 7. The slide motor 8 moves the pickup 2 in the radial direction of the optical disc 1.

In this embodiment, only one counter is provided for the sake of simplicity, so that the above-mentioned [Equation 3] and [Equation 4] are examples where Φ = 0. By adding a counter shifted by Φ,
AFC as shown in the above [Equation 5] can be realized. Further, by further increasing the counter, sine wave data and cosine wave data can be extracted from one sine wave table. Here, only the first-order component of the disk rotation synchronization is compensated. However, by arranging a number of blocks in parallel and appropriately setting the counter value, it is possible to compensate for a plurality of arbitrary order components.

Although the output signal of the spindle driver 18 is used here to obtain a signal synchronized with the rotation speed of the spindle motor 19, the input signal of the spindle driver 18 can be used.

[Second Embodiment] In the disk recording / reproducing apparatus according to the present invention, the AFC operation may be performed in a digital arithmetic unit (hereinafter referred to as DSP) 130 as shown in FIG. In this case, even when compensating for a plurality of orders, it is not necessary to increase the circuit scale.

The CLV drive control for the spindle motor 19 is the same as that in the first embodiment. Since a signal (so-called FG or the like) synchronized with the rotation speed of the spindle motor 19 is output from the spindle driver 18, the rotation synchronization signal is used as it is, or a multiplier or a frequency divider 91 is used. Thus, a clock signal having a frequency which is a constant multiple of the disk rotation frequency, for example, M times, is obtained by appropriately multiplying or dividing the rotation synchronization signal. In this embodiment, this clock signal is used as an operation reference clock of the DSP 130.

Assuming that the rotational angular velocity of the optical disc 1 is ω,
One cycle T of the clock signal is 2π / Mω. The rotational angular velocity of the optical disc 1 changes according to the radial position of the pickup 2 so that the linear velocity at a position corresponding to the pickup 2 becomes constant.
Also change. The DSP 130 performs the following AFC operation every time T. Here, k is an integer indicating the time point, and 0
To M-1.

The servo pits engraved on the optical disk 1 are read by the pickup 2, and a tracking error signal is generated in the tracking error signal detector 4 based on the read signal. This tracking error signal becomes an AFC input signal and is input to the DSP 130 through the A / D converter 99. In the DSP 130, the AFC input signal is subjected to cos (ω) calculated in the DSP 130 by multipliers 106 and 107, respectively.
kT + Φ1) and sin (ωkT + Φ1), and after being appropriately amplified by the amplifiers 108 and 109,
Cumulative adders 110 and 111 respectively perform cumulative addition. The respective cumulative addition values are calculated by multipliers 112 and 113.
Are further multiplied by cos (ωkT) and sin (ωkT), added by the adder 114, and become an AFC output signal of the disk rotation synchronous primary component. Similarly,
The AFC input signal is supplied to the multiplier 11 in the DSP 130.
At 5 and 116, the signals are multiplied by cos (2ωkT + Φ2) and sin (2ωkT + Φ2) calculated in the DSP 130, respectively, appropriately amplified by the amplifiers 117 and 118, and then cumulatively added by the cumulative adders 119 and 120, respectively. . Each cumulative addition value is calculated by the multiplier 12
Further, cos (2ωkT) and sin (2ω
kT), and the result is added in the adder 123 to become an AFC output signal of the disk rotation synchronous secondary component.

The primary AFC output signal and the secondary AFC output signal are added in an adder 124, and then added to a tracking error signal in an adder 102 through a D / A converter 125.
Sent to The phase compensation drive amplifier 5 generates a control current based on the signal obtained by adding the AFC output signal and the tracking error signal, and supplies the control current to a voice coil motor (VCM) 3 constituting an actuator of the pickup 2. When the voice coil motor 3 is driven, the pickup 2 positions the irradiation position of the light beam on the recording track. In the control current generated by the phase compensation drive amplifier 5, a DC component is detected by a DC detection circuit 6, and the slide motor 8
Supplied to The slide motor 8 moves the pickup 2 in the radial direction of the optical disc 1.

In the present embodiment, only the primary and secondary components of the disk rotation synchronization are compensated, but the configuration of the disk recording / reproducing apparatus according to the present invention is not limited to this.

In this embodiment, the output signal of the spindle driver 18 is used to
Although a signal synchronized with the number of revolutions of 9 is obtained, an input signal of the spindle driver 18 may be used.

[Third Embodiment] A disk recording / reproducing apparatus according to the present invention may be provided with a zone CAV controller 132 as shown in FIG. Zones are
The signal recording area of the optical disc is divided into a plurality of concentric areas. Zone CAV controller 13
Reference numeral 2 denotes a controller that changes the number of revolutions of the optical disc 1 for each zone in accordance with the radial position of the pickup 2, and is basically realized by switching the reference frequency of the spindle driver 18.

To execute the zone CAV, there is a method of changing the frequency division ratio of the master clock by the control computer. However, in this embodiment, the means is not limited. When the spindle driver 18 drives the spindle motor 19 in accordance with the zone CAV controller 132, the optical disc 1 is controlled so that the number of rotations is constant for each zone.

A signal (so-called FG) synchronized with the rotation speed of the spindle motor 19 is sent from the spindle driver 18.
Etc.) are output. This rotation synchronization signal is used as it is, or the rotation synchronization signal is appropriately multiplied or divided by a multiplier or a frequency divider 91, and is multiplied by a constant multiple of the disk rotation frequency, for example, M times. A clock signal having a frequency can be obtained. The counter 92 is incremented based on this clock signal.
The counter 92 counts up from 0 to M−1, and is cleared to 0 by M.

On the other hand, a cosine wave table 9 having M data
3 and a sine wave table 94 are prepared on the memory. In these tables, M data for one cycle of a cosine wave and one cycle of a sine wave are stored in a memory space from addresses 0 to M-1. From these tables, counter 9
The data at the address indicated by No. 2 is referenced and output. As a result, cosine wave and sine wave data constantly synchronized with the disk rotation speed can be obtained.

The signal engraved on the optical disk 1 is read out by the pickup 2 and sent to the reproduction system circuit 131. Further, servo pits engraved on the optical disk 1 are read by the pickup 2, and a tracking error signal is generated in the tracking error signal detector 4 based on the read data. This tracking error signal becomes an AFC input signal, and is multiplied by the cosine wave data from the cosine wave table 93 and the sine wave data from the sine wave table 94 in multipliers 95 and 96, respectively, and is appropriately amplified by amplifiers 97 and 98. After that, they are cumulatively added by the cumulative adders 99 and 100, respectively. The respective cumulative addition values are calculated by multipliers 101, 10
At 2, the data is further multiplied by the cosine wave data and the sine wave data, added at the adder 103, and becomes an AFC output signal.

The AFC output signal is added to the tracking error signal in the adder 104, and sent to the phase compensation drive amplifier 5. The phase compensation drive amplifier 5
A voice coil motor (VCM) that generates a control current based on a signal obtained by adding the AFC output signal and the tracking error signal and constitutes an actuator of the pickup 2
Supply 3 When the voice coil motor 3 is driven, the pickup 2 positions the irradiation position of the light beam on the recording track. The control current generated by the phase compensation drive amplifier 5 has a DC component detected by a DC detection circuit 6 and is supplied to a slide motor 8 via a power amplifier 7. The slide motor 8 moves the pickup 2 in the radial direction of the optical disc 1.

In this embodiment, since only one counter is provided for simplicity, an example is shown in the case of Φ = 0 in the above [Equation 3] and [Equation 4]. By adding a counter shifted by Φ,
AFC as shown in the above [Equation 5] can be realized. Further, by further increasing the counter, sine wave data and cosine wave data can be extracted from one sine wave table. Here, only the first-order component of the disk rotation synchronization is compensated. However, by arranging a number of blocks in parallel and appropriately setting the counter value, it is possible to compensate for a plurality of arbitrary order components. Further, as described in the second embodiment, it is also possible to configure so that the AFC operation is performed using the DSP.

Although the output signal of the spindle driver 18 is used here to obtain a signal synchronized with the rotation speed of the spindle motor 19, the input signal of the spindle driver 18 can be used.

The present invention can be applied to a case where a spiral track disk-shaped recording medium is used and a case where a concentric track disk-shaped recording medium is used. Further, the present invention is also applicable to an apparatus that can only reproduce a disk-shaped recording medium.

[0066]

As described above, in the disk recording / reproducing apparatus according to the present invention, when executing the CLV type servo in which the frequency of occurrence of the disk rotation synchronous disturbance changes according to the position of the pickup, one or a plurality of servos are performed. For compensating the disk rotation synchronization order component (Adaptive Feeld)
By using a forward canceller (AFC) that changes the compensation frequency in accordance with a change in the disk rotation speed, a specific disk rotation synchronization order component can be stably removed, and the disturbance suppression rate can be sufficiently ensured. .

The present invention can be similarly applied to a so-called zone CAV type servo in which the disk rotation speed changes in each zone with the same configuration.

Further, the present invention can be similarly applied to a case where a spiral track disk-shaped recording medium is used and a case where a concentric track disk-shaped recording medium is used. Further, the present invention is also applicable to an apparatus that can only reproduce a disk-shaped recording medium.

That is, the present invention provides a CLV in which the rotation speed of the spindle motor changes according to the position of the pickup.
A disk recording / reproducing apparatus employing a servo or zone CAV servo, capable of providing a disk recording / reproducing apparatus capable of sufficiently securing a disturbance suppression rate by introducing a disk rotation synchronous disturbance elimination filter. It is.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a disk recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a disk recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a tracking servo system in the recording / reproducing apparatus for an optical disc.

FIG. 5 is a block diagram showing a configuration of a CLV servo system in an optical disk recording / reproducing apparatus.

FIG. 6 is a block diagram showing the basic principle of AFC in a recording / reproducing apparatus for an optical disc.

FIG. 7 shows a basic A in an optical disk recording / reproducing apparatus.
FIG. 2 is a block diagram illustrating a configuration of an FC.

FIG. 8 is a block diagram showing a configuration of a control system in a conventional disk recording / reproducing apparatus.

[Explanation of symbols]

1 optical disk, 2 pickup, 3 voice coil motor, 4 tracking error signal detector, 5 phase compensation drive amplifier, 8 slide motor, 10 demodulator,
11 PLL, 12 RAM, 13 crystal oscillator, 18
Spindle driver, 19 Spindle motor, 91
Frequency divider or multiplier, 92 counter, 93 cosine wave table, 94 sine wave table, 130 DS
P, 131 playback system, 132 zone CAV controller

Continuation of the front page (72) Inventor Hiroaki Yada 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D066 GA08 5D096 AA05 CC01 DD01 DD02 FF01 FF04 FF06 HH01 HH06 HH14 HH18 KK01 KK12 5D118 AA24 BA01 BB01 BB02 BD02 BF01 CA09 CA13 CB02 CC12 CD03 CD12 CD17

Claims (4)

[Claims] A spindle motor for rotating a disk-shaped recording medium; a recording / reproducing head for recording / reproducing an information signal on / from a disk-shaped recording medium rotated by the spindle motor; An actuator that moves to an arbitrary radial position on a disk-shaped recording medium; an actuator driving unit that drives the actuator; a control unit that controls the actuator driving unit; and the disk-shaped recording medium at a position of the recording / reproducing head. Disk rotation control means for controlling the linear rotation speed of the disk to be constant, and sine wave generation means for generating a sine wave synchronized with the rotation frequency of the disk-shaped recording medium, wherein the control means, the sine wave generation means Combining the generated sine wave and supplying it to the actuator drive means. Ri, disk recording and reproducing apparatus, characterized in that to follow the write head to a disturbance synchronizing rotation of the disk-shaped recording medium. 2. The disk recording / reproducing apparatus according to claim 1, wherein the sine wave generating means comprises a counter and a sine wave data table. 3. A spindle motor for rotating a disk-shaped recording medium having a signal recording area divided into a plurality of zones in the radial direction, and recording of information signals on the disk-shaped recording medium rotated by the spindle motor. A recording / reproducing head for reproducing, an actuator for moving the recording / reproducing head to an arbitrary radial position on the disc-shaped recording medium, an actuator driving means for driving the actuator, and a control means for controlling the actuator driving means Disk rotation control means for controlling the rotation angular velocity of the disk-shaped recording medium to be constant for each zone to which the position of the recording / reproducing head belongs; and a sine for generating a sine wave synchronized with the rotation frequency of the disk-shaped recording medium. Wave generating means, wherein the control means generates the sine wave generating means. By supplying to said actuator drive means by synthesizing a sine wave, the disk recording and reproducing apparatus, characterized in that to follow the write head to a disturbance synchronizing rotation of the disk-shaped recording medium. 4. The disk recording / reproducing apparatus according to claim 3, wherein the sine wave generating means comprises a counter and a sine wave data table.