JPH1196666A - Disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption by making a discoid recording medium perform a rotational servo operation by a CLV servo means having a constant linear speed rotation during an access execution period, and a rotational servo operation by a CAV servo means having a constant angular speed rotation during a stop period, and defining the reference value of the CAV rotational servo operation according to the radial position of the discoid recording medium. SOLUTION: A spindle motor 2 is driven by a motor driver 25, and an FG pulse is outputted to be a frequency according to motor rotation by an FG 26. In a CLV servo system, the motor driver 25 rotary-drives the spindle motor 2 according to a voltage as a servo drive signal, and executes rotational servo having a constant linear speed. Such a CLV servo operation is performed during an access execution period. On the other hand, the rotational speed of the CAV servo is set to be variable according to the radial position of the disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for performing a recording or reproducing operation on a recording medium on a disk, and more particularly to a disk drive in which recording / reproducing access is repeatedly performed intermittently.

[0002]

2. Description of the Related Art As a recording apparatus / reproducing apparatus capable of recording / reproducing music and the like, a magneto-optical disk recording / reproducing apparatus which records an audio signal as a digital signal is known. For example, in a recording / reproducing system using a magneto-optical disc known as a mini-disc, a user can record and reproduce sound such as music. In this mini-disc system, for example, at the time of reproduction, an optical head reads audio data from a disk at a high rate and temporarily stores the audio data in a buffer memory. Then, the data is read out from the buffer memory at a low rate (the rate at which the music is reproduced as a normal speed music), and is output as reproduced audio data. Thus, even if data reading by the optical head is temporarily interrupted due to disturbance or the like, the reproduced audio output is not interrupted, and a so-called anti-vibration function is realized as is well known.

[0003] Due to such an operation, when the accumulated amount of audio data in the buffer memory reaches the full capacity, data reading from the disk by the optical head is temporarily stopped, and the accumulated amount of audio data becomes equal to or less than a predetermined amount. At this point, reading from the disk is resumed.
That is, at the time of reproduction, as an operation on the disc, the access execution period and the access suspension period are repeated. At the time of recording, the recording data is temporarily stored in the buffer memory, and is used for the recording operation from the magnetic head when a predetermined amount of data is accumulated. The access suspension period is repeated.

[0004]

In the case of this mini-disk system, the disk (spindle motor for rotating the disk) is rotated at CLV (constant linear velocity) during the access execution period.
As a matter of course, data is not read / written, rotation speed control for the spindle motor is not particularly necessary. However, it is preferable that data can be read as quickly as possible when the access execution period is reached, and it is therefore desirable that startup of various servos be completed promptly.
In order to speed up the setting of the CLV servo of the spindle motor, it is preferable to apply the rotation servo roughly at a speed close to the CLV speed to some extent during the access suspension period.
Therefore, a technique has been proposed in which CAV (constant angular velocity) servo is applied to the spindle motor during the access suspension period.

FIG. 9 shows various servo states during an access execution period Ta and an access suspension period Tb. For example, at the time of reproduction, as shown in FIG. 9A, data is read from the disk during the access execution period Ta and written into the buffer memory. When the storage amount in the buffer memory becomes full, the data reading is stopped. That is, it enters the access suspension period Tb. And FIG. 9 (b)
As shown in (c), during the access execution period Ta, the spindle motor is driven by the CLV, and the focus servo, the tracking servo, and the thread servo are turned on, that is, the data can be read.
On the other hand, during the access suspension period Tb, although each servo is turned off, CAV rotation servo is applied to the spindle motor, and the spindle motor is driven to rotate at a predetermined rotation speed.

By the way, the mini disk system is a CLV
Because of this method, the rotational speed of the spindle motor by the CLV servo is greatly different between the inner circumference and the outer circumference of the disk. For example, when the rotation speed is represented by a rotation frequency, it is about 12 Hz at the inner circumference and about 6 Hz at the outer circumference. The above-described CAV control in the access suspension period Tb takes an intermediate value and executes, for example, 8.83 Hz as a rotation reference speed.

However, as described above, the access suspension period T
When CAV control is performed so that b has a specific rotation speed,
There has been a problem that a loss of power consumption is large and a good result is not always obtained in terms of speeding up the servo settling time.

As shown in FIG. 10A, the control voltage for the spindle motor when the access execution period Ta and the access suspension period Tb are repeated is shown in FIG.
(C) and (d) show the cases of the inner circumference, the middle circumference, and the outer circumference, respectively. 10 (b), (c) and (d), the current flowing through the spindle motor is expressed in the form of applied voltage (current I = voltage V / resistance R, in which case the resistance R is constant) Therefore it is synonymous). Although the kick voltage KC for increasing the rotation speed of the spindle motor and the brake voltage BL for decreasing the rotation speed of the spindle motor are also shown here, the kick voltage KC and the brake voltage BL as the actual control signals are opposite. It goes without saying that it becomes polar. In addition, the gain of the kick voltage or the brake voltage is higher in the transition to the access execution period Ta than in the transition to the access suspension period Tb for the purpose of speeding up the servo stabilization.

First, for example, the situation at the center of the disk where the CLV rotation frequency is about 9 Hz will be considered with reference to FIG. In this case, since there is not much difference in the rotation speed when transitioning from the access suspension period Tb driven by CAV rotation at approximately 8.8 Hz to the access execution period Ta, the CLV speed is quickly increased by the kick voltage KC as shown in the figure. Is settled to.
Also, when shifting from the access execution period Ta to the access suspension period Tb, if the brake voltage BL is slightly applied, the CAV speed is settled.

On the other hand, as shown in FIG. 10B, for example, on the inner circumference of the disk where the CLV rotation frequency is about 12 Hz, the access suspension period Tb driven by CAV rotation at about 8.8 Hz changes from the access execution period Ta to the access execution period Ta. At the time of shifting, a large difference in rotational speed is generated. There is also a large rotation speed difference when shifting from the access execution period Ta to the access suspension period Tb. Similarly, FIG.
As shown in the figure, for example, the CLV rotation frequency is
In the outer circumference of the disk, a large rotation speed difference occurs when shifting from the access suspension period Tb driven by CAV rotation at about 8.8 Hz to the access execution period Ta, and from the access execution period Ta to the access suspension period. T
There is also a large rotational speed difference when shifting to b.

As can be seen from these figures, at the inner circumference or outer circumference, the kick voltage K for pulling the rotation speed to the CLV speed when shifting to the access execution period Ta.
A large rush current flows due to C or the brake voltage BL. Also, when shifting to the access suspension period Tb, a large rush current is generated due to the kick voltage KC or the brake voltage BL for pulling the rotational speed to the CAV speed. Flows. Such a rush current results in a large power loss, and, for example, in the case of a battery-driven device, affects the recordable / reproducible drive time.

As can be seen from the situation shown in FIG. 10, the setting of the rotational speed of the spindle motor can be completed quickly at the center of the disk, and the servo setting can be speeded up over the entire circumference of the disk. Was not.

[0013]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a disk drive device in which recording / reproducing access is performed intermittently and repeatedly. The purpose is to realize quick settling.

For this purpose, CLV servo means for controlling the rotation of the disk-shaped recording medium by the motor means to a constant linear velocity rotation, and CAV servo means for controlling the rotation of the disk-shaped recording medium by the motor means to the constant angular velocity rotation. Provide. In addition, during the access execution period for writing or reading data, the rotation servo operation of the motor means is performed by the CLV servo means. During the access suspension period for not writing or reading data, the motor means is controlled by the CAV servo means. A control means is provided for executing the rotation servo operation and setting a reference value of the CAV rotation servo operation by the CAV servo means in accordance with the radial position of the disk-shaped recording medium. That is, during the access suspension period, the CAV rotation control at a rotation speed close to the CLV rotation speed at the radial position of the disk-shaped recording medium at that time is executed, that is, the CAV rotation speed is switched according to the radial position. This prevents the speed difference between the CLV rotation speed during the access execution period and the CAV rotation speed during the access suspension period from increasing over the entire circumference.

Similarly, there are provided CLV servo means for controlling the rotation of the disk-shaped recording medium by the motor means at a constant linear velocity rotation, and CAV servo means for controlling the rotation of the disk-shaped recording medium by the motor means to the constant angular velocity rotation. In the configuration, the rotation servo operation of the motor means by the CLV servo means is executed during the access execution period, the rotation servo operation of the motor means by the CAV servo means is executed during the access suspension period, and the CAV rotation servo operation by the CAV servo means is performed. The control means for setting the reference value to a value corresponding to the rotation speed immediately before the access suspension period is provided. In other words, during the access suspension period, CAV based on the CLV speed immediately before entering the access suspension period is used as a reference.
By performing the servo control, the speed difference between the CLV rotation speed during the access execution period and the CAV rotation speed during the access suspension period does not increase over the entire circumference.

[0016]

Embodiments of the present invention will be described below. The disk drive device according to this embodiment is a recording / reproducing device using a magneto-optical disk (mini disk) as a recording medium. The description will be made in the following order. <I> First Embodiment I-1. Configuration of recording / reproducing device I-2. Spindle servo system I-3. Spindle servo operation <II> Second embodiment II-1. Spindle servo system II-2. Spindle servo operation

<I> First Embodiment I-1. 1. Configuration of Recording / Reproducing Apparatus FIG. 1 shows an internal configuration of a mini-disc recording / reproducing apparatus 1 according to an embodiment. A magneto-optical disk (mini disk) 90 on which audio data is recorded is driven to rotate by the spindle motor 2. Then, a laser beam is irradiated on the magneto-optical disk 90 by the optical head 3 during recording / reproduction.

The optical head 3 performs a high-level laser output for heating a recording track to the Curie temperature during recording, and a relatively low-level laser for detecting data from reflected light by a magnetic Kerr effect during reproduction. Perform output. Therefore, the optical head 3 is equipped with a laser diode as a laser output unit, an optical system including a polarizing beam splitter and an objective lens, and a detector for detecting reflected light. The objective lens 3a is held by the biaxial mechanism 4 so as to be displaceable in the radial direction of the disk and in the direction of coming into contact with and separating from the disk.

The optical head 3 with the disk 90 interposed therebetween
The magnetic head 6a is arranged at a position facing the above. The magnetic head 6a performs an operation of applying a magnetic field modulated by the supplied data to the magneto-optical disk 90. The entire optical head 3 and the magnetic head 6a can be moved in the disk radial direction by the thread mechanism 5.

The information detected from the disk 90 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 performs an arithmetic operation on the supplied information to reproduce the RF signal, the tracking error signal TE, the focus error signal FE, and groove information (absolute position information recorded as a pre-groove (wobbling groove) on the magneto-optical disk 90). GFM and the like are extracted. The extracted reproduced RF signal is supplied to the encoder / decoder section 8. Further, the tracking error signal TE and the focus error signal FE are supplied to the servo circuit 9, and the groove information GFM is supplied to the address decoder 10.

The servo circuit 9 receives the supplied tracking error signal TE, focus error signal FE, and spindle error signal SPE from the encoder / decoder section 8.
(CLV), and various servo drive signals are generated by a track jump command, an access command, a start / stop command of the spindle motor 2 from the system controller 11 composed of a microcomputer, etc., and the two-axis mechanism 4 and the thread mechanism 5 to perform focus and tracking control, and apply a drive voltage to a motor driver 25 that drives the spindle motor 2 to control the spindle motor 2 to a constant linear velocity (CLV). Although the spindle servo system will be described later, the servo circuit 9 includes a pulse (FG) from an FG 26 (frequency generator) attached to the motor driver 25.
Pulse) to drive the spindle motor 2 at a constant angular velocity (C
AV).

The address decoder 10 decodes the supplied groove information GFM to extract address information.
This address information is supplied to the system controller 11 and used for various control operations. The reproduced RF signal is supplied to the encoder / decoder unit 8, where a reproduced clock is generated, an EFM demodulation of the reproduced RF signal is performed based on the reproduced clock, and a decoding process such as CIRC is performed. Are also extracted and supplied to the system controller 11. Further, since the reproduction clock synchronized with the reproduction RF signal also becomes information on the disk rotation speed, a spindle error signal SPE (CLV) as a CLV rotation servo is generated using this. Although the blocks are divided in the description, the encoder / decoder unit 8, the servo circuit 9, the address decoder 10 and the like are actually provided with a DSP (DIGITAL SIGNAL PROCESSER).
In some cases, it is integrated into a chip.

EFM demodulation in the encoder / decoder unit 8
The decoded audio data (sector data) such as CIRC is temporarily written into the buffer memory 13 by the memory controller 12. The buffer memory 13 is, for example, a 4-Mbit D-RAM and can store audio data corresponding to reproduced audio for about 10 seconds. In this example, reading of data from the disk 90 by the optical head 3 and transfer of reproduced data in the system from the optical head 3 to the buffer memory 13 are 1.41 Mbit / sec.
At a high rate, and intermittently.

The data written in the buffer memory 13 is read out at the timing when the transfer of the reproduction data becomes 0.3 Mbit / sec (the transfer rate corresponding to the normal audio output), and supplied to the encoder / decoder section 14. . Then, subjected to reproduction signal processing of the decoding processing and the like for the audio compression processing, 44.1KH _Z sampled and a digital audio signal of 16-bit quantization. This digital audio signal is converted into an analog signal by the D / A converter 15, the output processing unit 16 performs level adjustment, impedance adjustment, and the like, and outputs the analog audio signal Aout from the line output terminal 17 to an external device. . Although not shown, it is of course possible to output a sound signal to headphones connected by providing a headphone output terminal.

The digital audio signal decoded by the encoder / decoder section 14 is supplied to the digital interface section 22 so that the digital audio signal can be output from the digital output terminal 21 to an external device as a digital audio signal Dout. . For example, it is output to an external device in the form of transmission by an optical cable.

When a recording operation is performed on the magneto-optical disk 90, the recording signal (analog audio signal Ain) supplied to the line input terminal 18 is converted into digital data by the A / D converter 19. Thereafter, the data is supplied to the encoder / decoder unit 14 and subjected to audio compression encoding processing. Or from a digital input terminal 20
Is supplied with the digital audio signal Din,
The digital interface unit 22 extracts control codes and the like, and the audio data is supplied to the encoder / decoder unit 14 and subjected to audio compression encoding processing. Although not shown, it is naturally possible to provide a microphone input terminal and use the microphone input as a recording signal.

The recording data compressed by the encoder / decoder section 14 is once written and accumulated in the buffer memory 13 by the memory controller 12, and then read out for each predetermined amount of data unit.
The data is sent to the decoder unit 8. After being subjected to encoding processing such as CIRC encoding and EFM modulation in the encoder / decoder section 8, it is supplied to the magnetic head drive circuit 6.

The magnetic head drive circuit 6 supplies a magnetic head drive signal to the magnetic head 6a in accordance with the encoded recording data. That is, the magnetic head 6a applies an N or S magnetic field to the magneto-optical disk 90. At this time, the system controller 11 supplies a control signal to the optical head so as to output a laser beam at a recording level.

The operation unit 23 indicates a part to be operated by a user, and as operation elements, for example, reproduction, recording, pause,
Operators related to recording / reproducing operations such as stop, FF (fast forward), REW (fast rewind), and AMS (search for cue), and operators related to play modes such as normal playback, program playback, and shuffle playback. An operator for a display mode operation for switching a display state on the display unit 25,
Operators for editing operations such as track (program) division, track concatenation, track erasure, track name input, and disc name input are provided. Operation information from these operation keys and dials is supplied to the system controller 11, and the system controller 11 executes operation control according to the operation information.

The display section 25 shows the operation mode state, the track number, the recording time / reproduction time, the editing operation state, etc. of the recording / reproducing disc. This display operation is controlled by the system controller 11. That is, the system controller 11 transmits data to be displayed when the display operation is performed to the display driver in the display unit,
The display driver drives the display panel unit 25 such as a liquid crystal based on the supplied data to execute display of required numbers, characters, symbols, and the like.

The system controller 11 is a microcomputer having a CPU, a program ROM, a work RAM, an interface, and the like, and controls the various operations described above.

When recording / reproducing operations are performed on the disk 90, management information recorded on the disk 90, that is, P-TOC (premastered TOC),
It is necessary to read U-TOC (user TOC).
The system controller 11 determines the address of the area to be recorded on the disk 90 and the address of the area to be reproduced on the disk 90 according to the management information. This management information is held in the buffer memory 13. Then, when the disk 90 is loaded, the system controller 11 reads out the management information by executing a reproduction operation on the innermost peripheral side of the disk on which the management information is recorded, and stores the information in the buffer memory 13. Thereafter, it can be referred to at the time of recording / reproducing / editing operation on the disc 90.

I-2. Spindle Servo System The configuration of the spindle servo system will be described with reference to FIG. In the case of this example, two spindle servo systems, a CLV servo system and a CAV servo system, are formed. In FIG. 2, E
The FM-PLL circuit 8a, the CLV-PLL circuit 8b, and the binarization circuit 8c are blocks provided in the encoder / decoder section 8. The switch 9a and the drive signal generation section 9
b, a frequency comparison unit 9c is a block provided in the servo circuit 9. Of course, when the encoder / decoder unit 8 and the servo circuit 9 are integrated, they become blocks in the same chip, and when they are not integrated, the EFM-PLL circuit 8a and the CLV-PLL circuit 8
b, a configuration in which the binarization circuit 8c is provided in the servo circuit 9 is also conceivable.

The spindle motor 2 is driven by, for example, a motor driver 25 as a three-phase drive circuit, and the FG 26 outputs an FG pulse having a frequency corresponding to the rotation of the motor. The FG 26 outputs, for example, 12 pulses per rotation of the spindle motor 2.

In such a configuration, first, the CLV servo system is formed by the EFM-PLL circuit 8a, the CLV-PLL circuit 8b, the binarization circuit 8c, the switch 9a, and the drive signal generation section 9b. The connection terminal of the switch 9a is switched by the switching control signal SC from the system controller 11 during the CLV operation and the CAV operation, and the terminal tCLV and the CAV during the CLV servo operation.
During the servo operation, the terminal tCAV is connected.

At the time of the CLV servo operation, the reproduced RF signal from the RF amplifier 7 is binarized by the binarization circuit 8c and then supplied to the EFM-PLL circuit 8a.
A reproduction clock synchronized with the reproduction RF signal is generated by the PLL circuit 8a. The reproduced clock and the binarized reproduced RF signal are supplied to an EFM demodulation circuit (not shown in FIG. 2) and are subjected to demodulation processing as audio data. C
In the processing of the LV servo system, the fact that the reproduction clock is also used as the rotation speed information of the spindle motor 2 is used, and the reproduction clock is used as the current rotation speed information as CLV-
It is supplied to the PLL circuit 8b. CLV-PLL circuit 8b
In addition, a frequency signal serving as reference speed information as a CLV rotation speed is formed and supplied, for example, by dividing the frequency of a crystal-based master clock.
The circuit 8b generates a signal corresponding to the difference between the reference speed frequency and the reproduction clock as the current speed. This is CL
This becomes the spindle error signal SPE (CLV) in the V servo system.

The spindle error signal SPE (CLV) is supplied to a drive signal generator 9b via a switch 9a, and is subjected to predetermined compensation processing and amplification processing to be a servo drive signal. Supplied. The motor driver 25 rotationally drives the spindle motor 2 in accordance with the voltage as the servo drive signal, thereby executing a rotational servo with a constant linear velocity. Such a CLV servo operation is performed during the access execution period.

On the other hand, the CAV servo is executed during the access suspension period.
6, formed by a frequency comparison unit 9c, a switch 9a, and a drive signal generation unit 9b. The FG 26 outputs an FG pulse having a frequency corresponding to the rotation speed of the spindle motor 2, and the FG pulse is supplied to the frequency comparing unit 9c. The frequency signal that becomes the CAV reference speed is also supplied from the system controller 11 to the frequency comparing unit 9c. The frequency comparison unit 9c actually includes, for example, a frequency counter.
The frequency signal of the CAV reference speed from 1 is supplied as a value corresponding to the frequency. In the frequency comparing section 9c, this 2
By comparing the two values, the difference information of the current rotation speed with respect to the predetermined rotation speed, that is, the rotation speed as the CAV reference speed from the system controller 11 is output, and this is the spindle error signal SPE in the CAV servo system.
(CAV).

The spindle error signal SPE (CAV) is supplied to a drive signal generator 9b via a switch 9a, and is subjected to predetermined compensation processing and amplification processing to be a servo drive signal. Supplied. The motor driver 25 rotationally drives the spindle motor 2 in accordance with the voltage as the servo drive signal, whereby the rotation servo with a constant angular velocity is executed.

I-3. Spindle Servo Operation As described above, the CLV servo system and the CAV servo system are formed in this example. The operation of such a servo system will be described with reference to FIGS. As described above, the CLV servo is executed during the access execution period, and the CAV servo is executed during the access suspension period. The rotation speed as the CAV servo is variably set according to the radial position of the disk 90. . FIG. 3 shows the rotational speed frequency targeted as the CAV servo for each area of the disk 90.

The area structure of the disk 90 will be briefly described with reference to FIG. The innermost peripheral side of the disc 90 is a pit area, and data as P-TOC is recorded by emboss pits. Also, the outer side of the pit area
A groove area (an area where a groove is formed as a magneto-optical area and data can be rewritten) is provided up to the outermost readout. The innermost circumference of the groove area is an area in which U-TOC and other administrative information are recorded, and the area up to the lead-out following that area is the main data recording area. That is, it is an area where audio data and the like are recorded.

In the case of the mini disk system, a data unit called a cluster is set as a unit of the recording operation, and one cluster is composed of 36 sectors. One sector is 2352 bytes. The address indicating the absolute position on the disk has a structure of a cluster address and a sector address, and is recorded for each sector. The starting point as the cluster address is the head of the groove area, which is shown in FIG.
00h ".

For such an area structure of the disk 90, a CAV frequency (CAV rotation speed) is set as shown in FIG. In this example, the area is
And a different CAV frequency is set for each of the divided areas. First, the innermost region is PT
The range is set up to OC and cluster address 0FFh, and the CAV frequency here is set to 12.76 Hz. The theoretical CLV frequency is shown on the right side. For example, the CLV at the cluster address 032h included in the area is shown.
The V frequency is 11.9 Hz.

The area includes the cluster addresses 100h to 1
FFh range, where the CAV frequency is 10.
94 Hz. The CLV frequency at the cluster address 100h included in the area is 10.5 Hz. The area is set within the range of cluster addresses 200h to 4FFh, and the CAV frequency here is 8.83 Hz. Cluster address 400h included in the area
Is 8.1 Hz. The area is set as a range from the cluster address 500h to the outermost periphery,
The CAV frequency here is 6.75 Hz. The CLV frequency at the cluster address 800h included in the area is 6.5 Hz.

That is, for each region set in the radial direction, a value close to the CLV frequency in that region is set as the CAV frequency. The system controller 11 stores such a CAV frequency for each area, and when entering the access suspension period, the address read at that time reads the area to
Is determined, and the CAV frequency is set.

FIG. 5 shows the processing of the system controller 11 for the spindle servo operation at the time of reproduction. During reproduction, the system controller 11 reads data from the disk 90 by the optical head 3, decodes the data, reads the data into the buffer memory 13,
Read and audio compression decoding and a series of playback operations such as audio compression and decoding.
With respect to the control of (1), the audio data storage amount of the buffer memory 13 is monitored as steps F100 and F101, and switching control of the access execution period and the access suspension period is performed based on this storage amount. That is, during the access execution period, the audio data is accumulated in the buffer memory 13 at a high rate, but when the full capacity of the buffer memory 13 is accumulated, the operation shifts to the access suspension period. Also, the storage amount of the buffer memory is monitored during the access suspension period, and reading from the disk 90 is resumed when the audio data storage amount becomes equal to or less than the predetermined amount. That is, the process shifts to the access execution period. Such a determination is made in steps F100 and F101.

First, when shifting to the access execution period,
The process proceeds from step F101 to F102. Of course, during the access execution period, each servo must be turned on in order to actually read data. Therefore, in step F102, a servo start-up process for turning on the focus servo, tracking servo, and thread servo is performed. Also, since the spindle motor 2 is being rotated by the CAV servo during the immediately preceding access suspension period, a process of switching to the CLV servo is performed in step F103. That is, the switch 9a in FIG. 2 is switched to the terminal tCLV.

Focus, tracking, thread, C
When the servos of the LV are settled and the current address is read, access to the target address is executed in step F104. That is, the operation is to access the sector next to the sector of the last audio data read in the previous access execution period. Then, when the access is completed, data reading by the optical head 3 and accumulation in the buffer memory 13 are started from step F105.

After the operation during the access execution period is started in this way, it is monitored in a loop of steps F100 and F101 whether or not the accumulated amount in the buffer memory 13 has become full. The process proceeds from step F100 to F106 assuming that the period shifts to the suspension period. In step F106, the current address, that is, the address of the last read sector in the access execution period is determined, and in step F107, the CAV frequency is set according to the address. That is, the system controller 11 refers to the information held (for example, stored as table data) as shown in FIG. 3 and first determines which of the area to the current address corresponds to. Then, the CAV frequency is set according to the determined area. The value corresponding to the set CAV frequency is supplied to the frequency comparing unit 9c in FIG.

In step F108, as a process for actually shifting to the access suspension period, focus servo,
The tracking servo and the thread servo are turned off, and in step F109, the spindle servo is switched to the CAV servo. That is, the switch 9a of FIG.
To be connected. As a result, during the access suspension period, C
The AV servo is executed. In particular, the CAV servo is controlled at a CAV frequency of 12.76 Hz if the immediately preceding access execution period is a read operation in the area.
If the immediately preceding access execution period was a read operation in the area, control is performed at a CAV frequency of 10.94 Hz. If the immediately preceding access execution period is a read operation in the area, the CAV frequency is 8.83 Hz. If the immediately preceding access execution period is a read operation in the area, the CAV frequency is 6.75 Hz.

By the processing of FIG. 5 as described above, the CAV rotation speed during the access suspension period is set to a rotation speed corresponding to the region (radial position) at that time, and the CLV during the access execution period before and after the access suspension period is set. It is assumed that there is not much difference between the rotation speed and the rotation speed. FIG. 6 shows a state of switching between the access suspension period and the access execution period in the area to the area in the same format as in the case of FIG. 10 described above. That is, when the access execution period Ta and the access suspension period Tb are repeated as shown in FIG.
FIG. 6B shows the control voltage for the spindle motor.
(C), (d) and (e) show the case of each of the areas (1) and (2). In this example, the buffer memory 13 has 4 Mbi.
t, in this case, the access execution period T
a is about 0.5 seconds, and the access suspension period Tb is about 1.5 seconds.

First, as an example of the region shown in FIG. 6B, a cluster in which the CLV rotation frequency is 11.9 Hz is shown. In this case, the access suspension period T
b, the CAV rotation frequency is 12.76 Hz, and there is not much difference in rotation speed when shifting from the access suspension period Tb to the access execution period Ta. Therefore, as shown in FIG. At the CLV speed. Also, when shifting from the access execution period Ta to the access suspension period Tb, the CAV speed is settled by slightly applying the kick voltage KC.

Next, as an example of the case of the region of FIG. 6C, a state of a cluster in which the CLV rotation frequency is 10.5 Hz is shown. In this case, the access suspension period T
b, the CAV rotation frequency is 10.94 Hz. When the transition from the access suspension period Tb to the access execution period Ta is performed, there is not much difference in rotation speed. Therefore, as shown in FIG. At the CLV speed. Also, when shifting from the access execution period Ta to the access suspension period Tb, the CAV speed is settled by slightly applying the kick voltage KC.

Similarly, in the cases of FIGS. 6C and 6D, there is not much speed difference between the CAV rotation speed during the access suspension period Tb and the CLV rotation speed during the access execution period Ta, so that the access execution period Ta As shown in the figure, when the brake voltage BL (or kick voltage) is applied, the CLV speed is quickly settled by the application of a slight brake voltage, and when the access execution period Ta shifts to the access suspension period Tb, the kick voltage If KC (or the brake voltage BL) is slightly applied, the CAV speed is settled.

As can be seen from these figures, since the speed difference between the CLV rotation speed and the CAV rotation speed can be made small over the entire circumference of the disk, the rotation speed is reduced to the CLV speed at the time of shifting to the access execution period Ta. A large rush current does not flow due to the kick voltage KC or the brake voltage BL, and the kick voltage KC or the brake voltage BL for pulling the rotation speed to the CAV speed when shifting to the access suspension period Tb. Power loss is eliminated. As a result, especially in the case of a battery-driven device, the recordable / reproducible drive time can be extended.

As can be seen from the situation shown in FIG. 6, the rotation speed of the spindle motor can be quickly settled over the entire circumference, realizing a CLV servo with good responsiveness and improving the operation efficiency during the access execution period. realizable.

In this embodiment, four areas are set in the radial direction of the disk and the CAV rotation frequency is switched in four steps. However, the number of area divisions for switching the CAV rotation frequency is not limited to four steps. Needless to say. Especially C
The larger the number of divisions as regions having different AV rotation frequencies, the smaller the difference between the CLV speed and the CAV speed, and the greater the effect of reducing power consumption and improving operation efficiency.

<II> Second Embodiment II-1. Spindle Servo System Next, a recording / reproducing apparatus according to a second embodiment of the present invention will be described. However, the overall configuration is the same as in FIG. 1 and the description is omitted. FIG. 7 shows a spindle servo system formed in the recording / reproducing apparatus according to the second embodiment.

The spindle servo system shown in FIG.
V servo system is EFM-PLL circuit 8a, CLV-PLL
The circuit 8b, the binarization circuit 8c, the switch 9a, and the drive signal generator 9b are formed in the same manner as in FIG.

As the CAV servo system, the FG 26, the frequency comparator 9c, the switch 9a, the drive signal generator 9
b, formed by the sample and hold circuit 9d. FG
An FG pulse having a frequency corresponding to the rotation speed of the spindle motor 2 is output from 26, and this FG pulse is supplied to the frequency comparison unit 9c. The frequency comparing unit 9c measures the frequency of the FG pulse using, for example, a frequency counter. The FG pulse is applied to the sample hold circuit 9d.
Is also supplied. The sample hold circuit 9d is provided with a sample timing signal STM from the system controller 11.
The FG pulse is sampled in accordance with, and is held and output to the frequency comparing section 9c. Specifically, for example, the measured value of the FG pulse measured by the frequency counter is held and output.

The frequency comparing section 9c compares the current frequency of the FG pulse (a value corresponding to the frequency) with the frequency (value corresponding to the frequency) output from the sample-and-hold circuit 9d and holds the predetermined rotation. The speed, that is, the difference information of the current rotation speed using the held rotation frequency as the CAV reference speed, is output, and this becomes the spindle error signal SPE (CAV) in the CAV servo system.

This spindle error signal SPE (CAV)
Is supplied to the drive signal generator 9b via the switch 9a, and is subjected to predetermined compensation processing and amplification processing to become a servo drive signal. This servo drive signal is supplied to the motor driver 25. The motor driver 25 rotationally drives the spindle motor 2 in accordance with the voltage as the servo drive signal, whereby the rotation servo with a constant angular velocity is executed.

For such a CAV servo system, the system controller 11 causes the sample-and-hold circuit 9d to execute a sampling operation immediately before shifting to the access suspension period, and to hold and output the sampled value during the access suspension period. .

II-2. Spindle Servo Operation The operation in the second embodiment in which the CAV servo system is formed as described above will be described with reference to the flowchart of FIG. FIG.
Is a process of the system controller 11 for the spindle servo operation at the time of reproduction.

As in the case of the first embodiment, the system controller 11 controls the optical head 3 during reproduction.
Read data from the disk 90, decode processing,
A series of reproduction operations such as reading into the buffer memory 13, reading from the buffer memory 13, and audio compression decoding processing are controlled and related. During this time, the control of the spindle motor 2 is performed in steps F202 and F201. 13 is monitored, and the switching of the access execution period and the access suspension period is controlled based on the storage amount. That is, during the access execution period, the audio data is accumulated in the buffer memory 13 at a high rate, but when the full capacity of the buffer memory 13 is accumulated, the operation shifts to the access suspension period. Also, the storage amount of the buffer memory is monitored during the access suspension period, and reading from the disk 90 is resumed when the audio data storage amount becomes equal to or less than the predetermined amount. That is, the process shifts to the access execution period. Such a determination is made in step F2.
00 and F201.

When shifting from the access suspension period to the access execution period, the processing is performed from steps F201 to F202.
Proceed to. Then, in the same manner as the processing described with reference to FIG. 5, in step F202, servo start-up processing for turning on the focus servo, tracking servo, and thread servo is performed, and in step F203, processing for switching the spindle servo from CAV servo to CLV servo is performed. . In step F204, the access to the target address is executed, and when the access is completed, data reading by the optical head 3 and accumulation in the buffer memory 13 are started from step F205.

After the operation during the access execution period is started in this way, it is monitored in a loop of steps F200 and F201 whether or not the accumulation amount in the buffer memory 13 has become full. The process proceeds from step F200 to F206 assuming that the process shifts to the access suspension period. In step F206, the system controller 11 causes the sample / hold circuit 9d to execute sampling of the FG pulse (a value corresponding to the pulse frequency) by the timing signal STM, and thereafter, holds and outputs the sampled value.

Next, in step F207, as a process for actually shifting to the access suspension period, the focus servo, the tracking servo, and the thread servo are turned off.
In step F208, the spindle servo is switched to the CAV servo. That is, the switch 9a of FIG.
Connect to CAV. As a result, the CAV servo is executed during the access suspension period.
The CLV frequency (the held rotation frequency) in the immediately preceding access execution period is the reference value. Therefore, when shifting from the access execution period to the access suspension period, the setting to the CAV rotation speed is established immediately without requiring almost any kick or brake control. Also, when shifting from the access suspension period to the access execution period, the CLV rotation speed required in the access execution period substantially coincides with the immediately preceding CAV rotation speed. There is little power consumption and the CLV speed will be established immediately.

That is, the difference in speed between the CLV rotation speed during the access execution period and the CAV rotation speed during the access suspension period can be reduced over the entire circumference of the disk, thereby eliminating power loss, rapidly setting the spindle, and improving operation efficiency. it can.

In the first and second embodiments, the switching operation between the CLV servo and the CAV servo has been described by taking the operation at the time of reproduction as an example. However, the access execution period and the access suspension period are also repeated at the time of recording. Accordingly, the same switching operation between the CLV servo and the CAV servo as during reproduction is performed. Although the embodiment has been described with respect to the mini-disc system, the present invention can be widely applied to a system in which an access execution period and an access suspension period are repeated in a recording or reproducing operation.

[0071]

As described above, according to the present invention, the reference value of the CAV rotation servo operation by the CAV servo means during the access suspension period is set according to the radial position of the disk-shaped recording medium. That is, during the access suspension period, the CL at the radial position of the disc-shaped recording medium at that time is
By switching the CAV rotation speed according to the radial position so that the CAV rotation control at a rotation speed close to the V rotation speed is executed, the CLV rotation speed during the access execution period and the CAV rotation speed during the access suspension period are changed. Can be prevented from increasing over the entire circumference, thereby avoiding a large power consumption (rush current) due to a spindle kick or a spindle brake during switching between the access execution period and the access suspension period. There is an effect that it can be realized. In particular, in the case of being driven by a dry battery or a rechargeable battery in a portable disk drive device or the like, the effect of extending the battery life can be obtained. In addition, since the speed difference between the CLV rotation speed during the access execution period and the CAV rotation speed during the access suspension period does not increase over the entire circumference, the spindle rotation speed at the time of switching between the access execution period and the access suspension period is always quickly set. And the operation efficiency can be improved. This also leads to the promotion of power saving.

Further, the control means has a reference value for the CAV rotation servo operation corresponding to the address value of the disk-shaped recording medium, and selects the corresponding reference value from the address value at the time of the access suspension period to perform the CAV. By supplying it to the servo means, it is possible to obtain an appropriate C
AV rotation drive control can be performed.

Further, according to the present invention, CAV during the access suspension period
The reference value of the CAV rotation servo operation by the servo means is set to a value corresponding to the rotation speed immediately before the access suspension period. In other words, during the access suspension period,
By performing the CAV servo control on the basis of the CLV speed immediately before entering the access suspension period, the CV of the access execution period is reduced.
The speed difference between the LV rotation speed and the CAV rotation speed during the access suspension period can be prevented from increasing over the entire circumference,
As a result, large power consumption (rush current) due to the spindle kick or the spindle brake during switching between the access execution period and the access suspension period can be avoided, and power saving can be realized. When this is also driven by dry batteries and rechargeable batteries,
The effect of extending the battery life can be obtained. In addition, similarly, the effect that the spindle rotational speed can be settled quickly at the time of switching between the access execution period and the access suspension period can be always quickly increased, and the effect of improving operation efficiency and promoting power saving can be obtained.

Further, the control means samples the rotational speed information of the motor means immediately before the access suspension period and supplies the hold output as a reference value to the CAV servo means, thereby obtaining the above effect with a simple configuration. Proper C for
AV rotation drive control can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a spindle servo system according to the first embodiment.

FIG. 3 is an explanatory diagram of a CAV rotation speed according to a radial position according to the first embodiment.

FIG. 4 is an explanatory diagram of an area of a disk used in the embodiment.

FIG. 5 is a flowchart of a spindle servo process according to the first embodiment.

FIG. 6 is an explanatory diagram of operating voltages in an access suspension period and an access execution period by a spindle process according to the embodiment.

FIG. 7 is a block diagram of a spindle servo system according to a second embodiment.

FIG. 8 is a flowchart of a spindle servo process according to the second embodiment.

FIG. 9 is an explanatory diagram of an access operation in the mini disc system.

FIG. 10 is an explanatory diagram of operating voltages in an access suspension period and an access execution period by a conventional spindle process.

[Explanation of symbols]

Reference Signs List 1 recording / reproducing device, 2 spindle motor, 3 optical head, 6a magnetic head, 8 encoder / decoder, 8a EFM-PLL circuit, 8b CLV-PLL
Circuit, 9 servo circuit, 9a switch, 9b drive signal generation section, 9c frequency comparison section, 9d sample hold circuit, 11 system controller, 12 memory controller, 13 buffer memory, 14 encoder / decoder section, 25 motor driver, 26F
G, 90 disc

Claims (4)

[Claims] An access execution period for writing or reading data as an access operation to the disc-shaped recording medium at the time of recording or reproducing the information on or from the disc-shaped recording medium; In a disk drive device in which an access suspension period in which data writing or reading is not performed is repeated, a motor means for rotating and driving the disk-shaped recording medium, and the rotation of the disk-shaped recording medium by the motor means is controlled to a constant linear velocity rotation. CLV servo means, CAV servo means for controlling the rotation of the disk-shaped recording medium by the motor means to a constant angular velocity rotation, and performing the rotation servo operation of the motor means by the CLV servo means during the access execution period, During the access suspension period, the CAV servo means controls the motor means. Together to execute rolling servo operation, said C
A disk drive device comprising: a control unit that sets a reference value of a CAV rotation servo operation by an AV servo unit according to a radial position of a disk-shaped recording medium. 2. The control means has a reference value of a CAV rotation servo operation corresponding to an address value of a disk-shaped recording medium, and selects a corresponding reference value from an address value at the time of an access suspension period. 2. The disk drive according to claim 1, wherein the signal is supplied to the CAV servo means. 3. An access execution period in which information is recorded or reproduced on a disk-shaped recording medium, and data writing or reading is performed as an access operation to the disk-shaped recording medium during the recording or reproducing operation; In a disk drive device in which an access suspension period in which data writing or reading is not performed is repeated, a motor means for rotating and driving the disk-shaped recording medium, and the rotation of the disk-shaped recording medium by the motor means is controlled to a constant linear velocity rotation. CLV servo means, CAV servo means for controlling the rotation of the disk-shaped recording medium by the motor means to a constant angular velocity rotation, and performing the rotation servo operation of the motor means by the CLV servo means during the access execution period, During the access suspension period, the CAV servo means controls the motor means. Together to execute rolling servo operation, said C
Control means for setting a reference value for the CAV rotation servo operation by the AV servo means to a value corresponding to a rotation speed immediately before the access suspension period. 4. The control means samples the rotation speed information of the motor means immediately before the access suspension period, and supplies the hold output as the reference value to the CAV servo means. A disk drive device according to claim 1.