JP2885015B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and more particularly to a CD having no clock information pit on a track.
When used as (Co m pact Disk) or MO (Magnet o Optical) peripheral storage device of a computer disk or the like, a technique for speeding up the access speed.

[0002]

Heretofore, CD is widely used as read disc of the audio information and video information, but, CD has a large storage capacity of 540M bytes be of diameter 12cm, the application Not limited to this, a so-called CD-ROM is used as a computer peripheral storage device for data files and image files. Recently, a MD (Mini-Disk) storing a rewritable MO disk in a floppy disk type small cartridge as a disk for recording and reproducing audio information has also been developed.
It is fully expected that MDs will be used as peripheral storage devices in small personal computers and the like in the near future.

In a CD or MD, the data recording / reproducing method is CLV (Constant Linear Velocit).
y: constant linear velocity), and as shown in FIG.
A spindle (SP) motor for driving the disk is controlled so that the rotation speed is inversely proportional to the track radius, so that the linear speed of the track to be recorded / reproduced is constant anywhere on the disk. Therefore, according to the CLV method, if a fixed length sector is continuously formed from the inner circumference to the outer circumference on a spiral track, data can be recorded in synchronization with a certain clock. When data is reproduced, data is reproduced and detected at a constant frequency, and recording and reproduction conditions are the same at any position on the disc.

[0004] On the other hand, the data recording / reproducing method for a disk is CAV (Constan- taneous) in comparison with the CLV method.
t Angular Velocity: Constant angular velocity. This method is used for analog audio records and ordinary hard disks. As shown in FIG.
The SP motor rotation speed and the recording / reproducing frequency are constant, so there is an advantage that the motor can be downsized and the circuit system can be simplified. There is a disadvantage that the total storage capacity is reduced because it is determined by the number of marks.

[0005]

SUMMARY OF THE INVENTION CD-RO
When the M disk device is compared with a general hard disk device, the latter is superior in access time, SP motor rotation speed, and data transfer speed. It is a matter of course that a CD-ROM disk device is required to have a high access speed as in the case of the hard disk device. Problems.

First, when reading data recorded at different positions on a disk, a pickup (PU)
Have reached the track, the disk rotation speed has reached the specified value, and the PU has reached the start point of the desired sector position on the target track. In this case, the control related to the condition is controlled by the PU feed motor and the PU servo circuit, and the control related to the condition is controlled by the SP motor and the SP servo circuit, respectively. Is a well-balanced optimal design. Since the time during which the conditions are satisfied under such design conditions is inversely proportional to the rotation speed of the SP motor, the access time of the SP motor is simply considered, as shown in the case of 1 × speed in FIG. It depends only on the number of revolutions.

However, if the rotation speed of the SP motor is increased to 2 ×, 4 ×,... In order to increase the data reading speed and the transfer speed, the CLV method increases the acceleration / deceleration of the rotation speed and increases the SP motor speed. If the torque is insufficient, an imbalance occurs in the time until the above condition is satisfied, and in fact, as shown in the case of the double speed and the quadruple speed in FIG. A standby time will be generated until the condition from is satisfied. That is, even if the rotation speed of the SP motor is increased, the access time itself does not change so much, and the time until the SP motor reaches the specified rotation speed is greatly affected. Also simply access
Not only the problem of time but also the acceleration of SP motor increases
Power consumption increases, and SP motors and
The temperature of the control circuit rises, and the disk
Thermal expansion may occur in the
There can be. Note that the above is for reading data.
However, similar conditions and problems arise during writing.
You.

On the other hand, with respect to those problems,
If the SP motor is rotated by the AV system,
There is no need to accelerate or decelerate the number of rotations during movement.
De the recording of the data address based on the formula it has been made
Even for disks, the time for reading / writing
Access time can be shortened by setting
And can be started with the acceleration of the SP motor.
The disadvantages and defects that occur can be eliminated.

[0009] Further , as a related prior art, data
While rotating the disk in CAV mode,
To perform recording and playback in the CLV format.
An optical disk recording / reproducing device capable of
(JP-A-2-16578). The device "spreads around the central hole.
Radially around the center hole on the circular recording surface
A clock information pit is arranged, and the clock information pit is
Recording tracks the central hole of the intercluster data SL recording area
Optical disks formed in a number of circular patterns surrounding
While rotating the track at a constant angular velocity,
Optical disk recording / reproducing device for recording / reproducing information to / from
From the reproduction output of the clock information pit
A clock recovery unit that generates a basic clock with a constant frequency fi
And the clock frequency fi of the basic clock is multiplied by M / N.
Form a channel clock of frequency fz converted to
Frequency conversion means and a frequency conversion ratio of the frequency conversion means
M / N is changed according to the recording track number of the optical disc.
Control means for converting the frequency,
Using the channel clock whose wave number has been converted, the recording
Characterized by recording and reproducing information on a disc
Disk recording and playback device. The purpose of the invention was
Although it is not intended for the problem described above,
At the time of access, based on the spinning disk
It is possible to shorten the time.

[0010] However, the above-mentioned invention is based on the center of the optical disc.
Clock information pits are placed on a line segment extending radially from
It is a prerequisite that the clock
Channel clock for recording / reproducing using information pits
Generate and set the channel track set for each recording track.
Each clock information pit on recording track using lock
Recording / reproduction to / from the data recording area
It is supposed to do. Therefore, as described above,
Suitable for CDs and MDs that do not have
I can't use it.

[0011] Therefore, the present invention relates to a method such as a CD or MD.
When accessing a general disk having no clock information pits and recording data addresses based on the CLV method, the access time is reduced,
It was also created for the purpose of solving each of the above-mentioned problems that occur with the acceleration of the SP motor.

[0012]

According to a first aspect of the present invention, in a disk device, a disk-shaped record carrier on which data is recorded based on a constant linear velocity system is mounted, and the record carrier is driven to rotate at a constant angular velocity. Rotation driving means, tracking means for controlling the position of a reading section with respect to a track of the record carrier, an amplifier for amplifying a signal read from the record carrier by the reading section and having a variable frequency characteristic, and the amplifier Detects the amplified read signal as digital data and determines the detected clock frequency of the read signal in accordance with the track position data of the record carrier and the track position and the rotational angular velocity of the rotation drive means in correspondence with the track position data. Frequency characteristic control data for controlling the high gain frequency band of the amplifier according to the reading speed. And storage means for storing detection clock frequency control data for controlling the detection clock frequency of the signal detection means, and the storage means corresponding to the track position data based on the track position data controlled by the tracking means. The present invention relates to a disk device comprising control means for controlling the amplifier and the signal detection circuit using the frequency characteristic control data and the detected clock frequency control data.

According to a second aspect of the present invention, there is provided a disk drive, wherein a disk-shaped record carrier on which an address has been recorded in advance based on a constant linear velocity method is mounted, and rotational drive means for rotating the record carrier at a constant angular velocity; Tracking means for controlling the position of a write / read section with respect to tracks on the record carrier; an amplifier for amplifying an address signal read from the record carrier by the write / read section and having a variable frequency characteristic; Address detection means for detecting the amplified address signal as digital data and its detection clock frequency is variable, and corresponding to the track position data of the record carrier,
Frequency characteristic control data for controlling the high gain frequency band of the amplifier according to the track position and a reading speed determined by the rotational angular velocity of the rotation driving means, and a detection clock frequency for controlling the detection clock frequency of the address detection means. Based on the track position data controlled by the tracking means, the frequency characteristic control data and the detected clock frequency control data corresponding to the track position data in the storage means based on the track position data controlled by the tracking means. The present invention relates to a disk device, comprising: a control unit that controls the amplifier and the address detection circuit; and a synchronization unit that synchronizes a writing unit based on address data detected by the address detection unit.

[0014]

In the first invention, data is recorded on the disc-shaped record carrier based on the CLV method.
The record carrier is rotated in a CAV system by a rotation driving means. Therefore, when reading data from the record carrier, the frequency of the read signal increases as the reading unit is shifted from the inner peripheral side to the outer peripheral side of the record carrier by the tracking means.

For this purpose, the frequency characteristic control data and the detected clock frequency control data corresponding to the track position data are provided in the storage means, and based on the track position data being controlled by the tracking means, the control means controls the correspondence of the storage means. The frequency characteristics of the amplifier and the detection clock frequency of the signal detection means are controlled using the control data thus obtained. In that case, the frequency of the read signal is determined by the track position and the rotational angular velocity by the rotary drive means. Naturally, each control data of the storage means is also configured to correspond to it, and the proper signal amplification and signal Detection becomes possible.

By the way, in the disk device of the present invention, since the rotation speed of the record carrier is constant, it is not necessary to change the rotation speed unlike the drive in the CLV system. Therefore, FIG.
In: Since the specified rotation speed arrival time is always constant and it is not necessary to consider the required time, the access time is the total time of: the movement time of the reading unit (PU) and the waiting time inversely proportional to the rotation speed. It is determined. In other words,
If the rotational angular velocity of the rotation driving means is increased, the time is shortened. If the control for the amplifier and the signal detecting means is executed correspondingly, normal signal detection can be performed while the access time is significantly reduced. Can be. And book
The disk device according to the present invention is compatible with the track position data.
Since each control data is provided in the storage means in advance,
Clock information pits are placed on the tracks of the
There is no need to keep it, so it can be used for a wide range of record carriers
Applicable.

The second invention relates to a configuration of a disk device for writing data to a record carrier formatted based on the CLV system. Generally, an index area (including an address area) divided by a wobbling mark or the like is formed in advance on a record carrier such as a CD or an MD, and data is written by detecting the address signal.

Therefore, according to the present invention, control of the amplifier and the address detecting means corresponding to the tracking position of the writing / reading section is executed based on the same principle as that of the above-mentioned invention, and the synchronizing means controls the address detected by the address detecting means. If the write unit is synchronized with the data, the data write can be executed based on the detection of the appropriate address signal. In other words, similarly to the above-described invention, normal writing of data can be performed while significantly shortening the access time at the time of writing. Also, the same as the first invention
Thus, no clock information pits are required on the record carrier.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described in detail with reference to FIGS. First, FIG.
FIG. 2 is a system circuit diagram of a disk device that reads data from a D-ROM and transfers the data to a host. In the figure, 1
Is a CD-ROM mounted on a spindle hub, 2 is an SP motor for rotating a turntable, and 3 is a built-in PLL (Ph
ase-Locked Loop) SP motor while synchronizing with circuit 3a
SP servo circuit for controlling rotation of 2, PU (optical pickup) for reading recorded data of CD-ROM1, PU driver for driving PU4, PU servo circuit for controlling driving and feeding of PU4, 7 Is a high-frequency amplifier whose frequency characteristics can be changed by switching the internal filter,
Reference numeral 8 denotes a signal detection circuit that detects a read signal obtained from the high-frequency amplifier 7 as a digital signal while synchronizing with a built-in digital PLL circuit 8a, and 9 demodulates EFM (Eight to Fourteen Modulation) data obtained from the signal detection circuit 8. EFM demodulation circuit 10 is a CIRC (Cross Inter
CD-ROM decoder that decodes demodulated data while performing error correction based on leave read-solomon code, etc., 11 is a host computer (not shown, hereafter referred to as “host”)
SCSI (Small Computer System Interface) that transfers decoded data to the host while communicating with
e) The control unit 12 is an MPU (Micro P
rocessing Unit).

This disk device is composed of (1) a CD-R
Although data recording based on the CLV method is performed in OM1, the SP servo circuit 3 rotates the SP motor 2 in the CAV method, (2) the frequency characteristics of the high-frequency amplifier 7 are variable, (3) It is characterized in that the detection clock frequency of the signal detection circuit 8 is variable and (4) the MPU 12 stores the high-frequency amplifier 7 and the control table 12a of the signal detection circuit 8 in its built-in ROM.

Here, the control table 12a is a CD-ROM.
In correspondence with the continuous track position data [Dt] from the innermost circumference to the outermost circumference, the high-frequency amplifier 7 of 36 stages
, The frequency characteristic control data [Df (1) to Df (36)], the charge pump control data [Dc (1) to Dc (36)] for the PLL circuit 8a of the signal detection circuit 8, and the division ratio control data [Dd ( 1) -D
d (36)]. Specifically, when the high frequency amplifier 7 is controlled by the frequency characteristic control data [Df (1) to Df (36)], the frequency characteristics as shown by F1 to F36 in FIG. 2 are obtained. That is, a 12 cm CD-ROM1 is 520 rpm
When rotated at a speed of 1.41 MBPS to 3.67
It becomes MBPS, and the required frequency of reading is 4.321, which is about 3 times
8MHz-11.24MHz, but it is a 36-stage LP
F and the high-frequency boost circuit divide the signal at a cutoff frequency of 200 kHz, and the read signal is "H" in the case of the EFM modulation method.
Or, the period corresponding to "L" is 3T, where T is 1 bit interval.
And 11T, there are 9 types. For each divided frequency characteristic, 1/11 is set to the lowest frequency, 1/3 is set to the highest frequency, and the boost peak value is increased by 3dB near the highest frequency. Have been.
Therefore, for example, regarding the innermost frequency characteristic F1, the frequency band from 0.3929 MHz to 1.4406 MHz is set as the optimum reproduction band. In this embodiment, only the high gain band is shifted, but control may be performed such that the boost amount is gradually increased as the frequency increases. The PLL circuit 8a of the signal detection circuit 8 includes a phase comparator 31 and a charge pump as shown in FIG.
32, a VCO (Voltage Controlled Oscillator) 33 and a frequency divider 34. The charge pump control data [Dc (1) to Dc (36)] switches the filter of the charge pump 32 and separates the filter. Circle ratio control data [Dd (1) to Dd
By switching the frequency division ratio of the frequency divider in (36)], the detection clock frequency of the signal detection circuit 8 is synchronized with the read signal by the PU4.

Next, a data reading procedure by the disk device will be described with reference to a flowchart of FIG. First, the MPU 12 activates the SP motor 2 by the SP servo circuit 3 and uses the speed signal of the speed sensor provided on the SP motor 2 to synchronize the signal with the PLL circuit 3a.
It is rotated at a constant speed of 20 rpm (S1). And CD-ROM1
When reading data from the host, the track position data [Dt (R1) to Dt (Rn)] is sent from the host via the SCSI controller 11.
Is received, and the MPU 12
The received data is saved in the AM (S2, S3).

Here, the MPU 12 controls the movement of the PU 4 by the PU servo circuit 6 and drives the PU driver 5, and the TOC (Table of Contents) data is stored while the PU 4 is once moved to the innermost periphery of the CD-ROM 1. Is read, and PU4 is moved to the reading start position by obtaining the focus / tracking control data of PU4 (S4).

According to the above procedure, the position of the PU 4 is controlled to the start track of the read area designated by the host. The MPU 12 controls the frequency characteristic corresponding to the start track position data [Dt (R1)] in its control table 12a. The control data [Df (X))] is set in the register of the high frequency amplifier 7, and the charge pump control data [Dc (X)] and the frequency division ratio control data are supplied to the PLL circuit 8a of the signal detection circuit 8.
[Dd (X)] is set (S5, S6). And high frequency amplifier 7
And the PLL circuit 8a respectively set the frequency characteristic of the gain and the detection clock frequency in accordance with each control data, and in this state, the recording data is read by the PU4 (S7, S7).
8). Therefore, the high-frequency amplifier 7 can amplify the read signal with the optimum characteristic corresponding to the starting track, and the signal detection circuit 8 converts the read signal into a digital signal accurately using the detection clock corresponding to the frequency. .

Next, when the read area designated by the host extends over a plurality of tracks, the PU servo circuit
6 moves the PU4 to the outer track sequentially while
Data will be read from the ROM 1 (S8 to S1
0). In this case, since the control table 12a of the MPU 12 divides all tracks into 36 steps and prepares control data corresponding to each divided area, the next read track is the switching position of the high-frequency amplifier 7 and the signal detection circuit 8. Needs to be determined. Therefore, MPU12 is always PU
4 monitors the position data of the track to which the track is sent, and the control table 12a indicates that the track has the control data [Df (1) to
f (36), Dc (1) to Dc (36), Dd (1) to Dd (36)], the control state is maintained as it is (S8 to S11 → S8), and the switching is performed. When a track is detected, the control data corresponding to the track is immediately set in the high-frequency amplifier 7 and the signal detection circuit 8, and the frequency characteristics and the detected clock frequency are switched (S
8-S11 → S12 → S6).

Accordingly, as the read track by the PU 4 moves, the control data is switched each time the track becomes the switching track position in the control table 12a, and the read signal is reproduced / reproduced with the optimum frequency characteristics and the detected clock frequency.
Will be detected. In this case, in this embodiment, CLV
The CD-ROM1 data recorded in the CD-ROM format is read while being rotated and driven in the CAV format, so the high-frequency amplifier naturally accompanies the movement of the read track (movement in the outer peripheral direction).
The optimum frequency band of 7 is shifted to the higher frequency side, and the detection clock frequency is shifted to a higher frequency.

By the way, a read request is often made repeatedly from the host after all the specified data has been read (S9 → S2). At that time, the time required for the disk device to start accessing the CD-ROM 1 is considered in consideration of the time required for the SP motor 2 to reach the specified rotation speed because the CD-ROM 1 is rotated by the CAV method. It does not need to be performed, and is determined by the initial control time (S1 to S7) for moving the PU4 to the target track and the waiting time until the start point of the desired sector position on the track is reached. That is, even when reading at a high speed in FIG. 9, if the SP motor 2 is previously rotated at a speed corresponding to the double speed mode, the standby time due to the difference between the PU movement time and the specified rotation speed arrival time is obtained. No occurrence occurs, and when the high-speed mode is set, the time required to reach the start point of the desired sector position (corresponding to) is inversely proportionally reduced, so that the access time is greatly reduced. In this embodiment, a CD-ROM is used.
However, based on the control method, the conventional technology (Japanese Patent Laid-Open No.
No. 62578).
There is no need to arrange the pits in a special manner.
The type of disk does not matter.

Then, in this disk device, the control data [Df (1) to
Df (36), Dc (1) to Dc (36), Dd (1) to Dd (36)] have their capture ranges overlapped, but read data continuously from multiple tracks In this case, since it is possible to determine whether or not the next read track is the switching position of each control data based on the control table 12a, the control data can be switched in advance immediately before the PU 4 moves to that track. In that case, for example, PU4 may move to a position greatly deviated from the target position due to an impact or the like, and a state in which data cannot be accurately read out when the capture range is exceeded occurs. When such a state occurs, a countermeasure for re-searching the address by setting the control data of the track position having the highest probability based on the immediately preceding read address by the MPU 12 can be taken. The TOC data may be read.

On the other hand, in the case of continuous reproduction,
When each control data is switched every time the PU 4 moves to the switching position track without performing the control data switching in advance, if the timing is determined by the first channel bit of the first frame in the track, Since the time required for the circuit operation of the high-frequency amplifier 7 and the signal detection circuit 8 to stabilize is about 2 μsec,
The data of the read track after the switching can be quickly reproduced and detected. In addition, depending on the circuit configuration of the high-frequency amplifier 7 and the signal detection circuit 8, a relatively long time (about 10 μsec) may be required until a stable operation at the time of switching, and a read error may occur. Stops playback / detection at the frame where the error occurred, moves PU4 to the inner circumference by one track, and if control data switching is completed during that time, the circuit is interrupted in a stable state It is possible to read again from the frame after that.
In the CD-ROM decoder 10, the read data is once written in the buffer memory and decoded, and the error data as described above is transferred to the host side so as to invalidate the error data so as not to be transferred. The continuity of data is not impaired, and the difference in transfer rate with the host side is absorbed by the buffer memory.

Further, as described above, each control data [Df (1)
To Df (36), Dc (1) to Dc (36), and Dd (1) to Dd (36)], the switching track position does not always have to be fixed. Thus, control with a certain degree of freedom can be executed. For example, in the case where the remaining read area specified by the host is several tracks despite reaching the switching track position, the high-frequency amplifier 7 and the signal detection are performed without intentionally switching control data. The control state of the circuit 8 can be maintained as it is.

Next, an embodiment in which data is written while a disk formatted based on the CLV system is rotated and driven by the CAV system will be described. The disk device according to this embodiment is shown in FIG. 5, and writes and reads data to and from an MD. In the figure, the system configuration related to the data reading system is almost the same as that of the above-mentioned disk device for CD. That is, although the characteristics of each unit and circuit are different because the MD1m is targeted, the SP motor 2, the SP servo circuit 3,
PU4, PU driver 5, high frequency amplifier 7, signal detection circuit
8, EFM demodulation circuit 9, SCSI controller 11, MPU 12
Is common. On the other hand, the data writing system is an MD decoder / encoder 21 shared with the reading system.
An EFM modulation circuit 22 for EFM-modulating the encoded data; an address detection circuit 23 for converting an address signal obtained from the high-frequency amplifier 7 into a digital signal while synchronizing with an internal digital PLL circuit 23a; A decoder 24 for decoding, a write synchronization circuit 25 for synchronizing a write clock with the decoded address data, a head driver 26, a magnetic head 27,
It is composed of a PU / head servo circuit 28 which also serves to feed the reading system PU 4 and the head driver 26.

Then, similarly to the above embodiment, the MPU 12
In the control table 12a, the frequency characteristics of the high-frequency amplifier 7 and the signal detection circuit 8 corresponding to the track position data of MD1m are stored.
Control data [Df] for controlling the detection clock frequency of
(1) to Df (24), Dc (1) to Dc (24), Dd (1) to Dd (24)].
The charge pump control data [Dca (1) to Dc (24)] for controlling the PLL circuit 23a of 23 and the division ratio control data [Dda
(1) to Dda (24)].

In this case, the frequency characteristic control data [Df (1)
~ Df (24)] controls the high frequency amplifier 7 as shown in FIG.
Frequency characteristics as shown in F1 to F24.
That is, when the MD1m is rotated at about 900 rpm, the reading speed is 1.41 MBPS (the innermost circumference: a diameter of 29 mm) to 2.97 MBPS.
(Outer circumference: 61 mm in diameter), and the required reading frequency is approximately tripled from 4.3218 MHz to 9.09 MHz.
With a 4-stage LPF and a high-frequency boost circuit, the signal is divided at a cutoff frequency of every 200 kHz. Further, as in the case of the above-described embodiment, there are nine types of read signals between 3T and 11T. 1/11 is set as the lowest frequency and 1/3 as the highest frequency, and the peak value of the boost is set to be higher by 3 dB near the highest frequency. Further, the control data [Dc (1) to
Dc (24), Dd (1) to Dd (24)] are also provided in 24 stages, and the charge pump and the frequency divider of the PLL circuit 8a are controlled in accordance with the frequency of the read signal. ing. Therefore, in the read mode of the disk device, the control data is set in the high-frequency amplifier 7 and the signal detection circuit 8 in the same procedure as in FIG.
Data can be stably read while the MD1m on which data is recorded based on the V method is rotationally driven by the CAV method.

On the other hand, the control data of the address detection circuit 23
[Dca (1) to Dc (24), Dda (1) to Dda (24)] are for detecting an address signal divided by a wobbling mark of MD1m.
Since U4 reads an address signal FM-modulated at a frequency of 22.05 kHz (innermost circumference) to 46.38 kHz (outermost circumference), the frequency corresponding to the track position data Dt from the innermost circumference to the outermost circumference is read. Is controlled by controlling the charge pump and the frequency divider of the PLL circuit 23a so that a detection clock obtained by dividing the address data into 24 stages can be obtained.

Hereinafter, a data writing procedure by the disk device will be described with reference to a flowchart of FIG. First, the MPU 12 activates the SP motor 2 by the SP servo circuit 3 and uses the speed signal of the speed sensor provided in the SP motor 2 to synchronize with the PLL circuit 3a to perform the synchronization.
It is rotated at a constant speed of 00 rpm (S21). Then, the track position data [Dt (W1)) is sent from the host via the SCSI control unit 11.
~ Dt (Wn)], M
PU12 saves the received data in the built-in RAM (S2
2, S23).

Here, the MPU 12 moves the transducer on which the PU 4 and the magnetic head 27 are mounted to the innermost peripheral side of the MD 1m by the PU / head servo circuit 28, and the PU driver
5 to read the TOC data and obtain focus / tracking control data to control the movement of the transducer to the writing start position (S24).

According to the above procedure, PU 4 and magnetic head 2
7, the position control is performed on the start track of the write area designated by the host. The MPU 12 controls the frequency characteristic control data [Df (X)] corresponding to the start track position data [Dt (W1)] in the control table 12a. )] High frequency amplifier 7
(S25, S26). Therefore, the high-frequency amplifier 7 sets the frequency characteristic of the gain corresponding to the set data.

Next, the MPU 12 stores start track position data.
[Dt (W1)] control data [Dca] of the address detection circuit 23
(X), Dda (X)] is set in the PLL circuit 23a, and the frequency division ratio of the filter of the charge pump and the frequency divider is switched (S27, S
28). Here, when the PU4 detects the wobbling mark from the write start track, the address detection circuit 23
While synchronizing with the detection clock set by the L circuit 23a, an address signal obtained through the high-frequency amplifier 7 is detected and output to the decoder 24 as digital data (S
29, S30).

The address data decoded by the decoder 24 is output to the write synchronizing circuit 25. The write synchronizing circuit 25 creates a write synchronizing signal using the address data, and the head driver 26 generates a write synchronizing signal based on the synchronizing signal. The recording data is written to the MD 1m by driving the head 27 (S31). It should be noted that the recording data is received from the host via the SCSI control unit 11, is encoded by the MD decoder / encoder 21, is modulated by the EFM modulation circuit 22, and is input to the write synchronization circuit 25.

Next, when the write area specified by the host extends over a plurality of tracks, the PU / head servo circuit 28 writes data on the MD1m while sequentially moving the transducer to the outer track. (S31-S33). In that case, the control table 12a of the MPU 12
Divides all tracks into 24 steps and prepares control data corresponding to each divided area. Therefore, it is determined whether or not the next write track is a switching position between the high-frequency amplifier 7 and the address detection circuit 23. There is a need. Then, M
The PU 12 constantly monitors the position of the transducer (track position data), and the control table 12a indicates that the track has control data [Df (1) to Df (24), Dca (1) to Dca (24), Dd
a (1) to Dda (24)], if the track is not a switching track, the control state is maintained (S31 to S34 → S31). If the track is a switching track, the control corresponding to that track is immediately performed. The data is set in the high-frequency amplifier 7 and the address detection circuit 23, and their frequency characteristics and the detected clock frequency are switched (S31 to S34 → S35 → S26).
Then, at that time, the write synchronization circuit 25 sets the 4.3218 MHz (innermost circumference) based on the address data obtained from the MD1m.
A synchronization signal is generated in the CLV system divided into 24 steps in a frequency range of 9.09 MHz (outermost circumference).

Accordingly, as the writing track by the magnetic head 27 moves, the control data is switched each time the switching track position in the control table 12a is reached, whereby the address signal is optimized with the optimum frequency characteristics and the detected clock frequency. Is reproduced and detected, and the write synchronization circuit 25
Thus, data is written while maintaining stable synchronization. Also in this embodiment, since data is written while the MD1m formatted in the CLV format is driven to rotate in the CAV format, the high-frequency amplifier 7 and the address detection are performed in accordance with the movement of the write track (movement in the outer peripheral direction). The control tendency of the circuit 23 is the same as that of the above embodiment, and the access time at the time of writing is greatly reduced because the MD1m is rotationally driven by the CAV method.

[0042]

According to the disk device of the present invention having the above configuration, the following effects can be obtained. The invention according to claim 1 has a clock information pit on a track.
Not, the disc-shaped record carrier the data recording based on the CLV method have been made, it possible to read the stable data is rotated driven by the CAV method, the data prior rotatably driven thereby by the CLV method as The access time in the reading mode is greatly reduced as compared with the case where reading is being performed. The invention of claim 2 is the same as the above.
Of the disc-shaped record carrier possible to write stable data while rotating driven by the CAV method, greatly shortening the access time in writing inclusive mode. Then, both of inventions, also limits of what such as if the disc-shaped recording medium received
Kicking applied can without further together can be miniaturized and circuitry simplification of the SP motor to without acceleration or deceleration of the rotation speed of the record carrier, reduction of the recording and reproducing accuracy due to temperature increase due to the acceleration and deceleration Also has the advantage of not inducing.

[Brief description of the drawings]

FIG. 1 shows a disk drive (CD-RO) according to an embodiment of the present invention.
FIG. 3 is a system circuit diagram of an access target (M is an access target).

FIG. 2 is a graph showing frequency characteristics of a high-frequency amplifier that is changed with a movement of a track position.

FIG. 3 is a block circuit diagram showing a configuration of a PLL circuit.

FIG. 4 is a flowchart showing a data reading procedure in the disk device.

FIG. 5 is a system circuit diagram of a disk device (an MD is an access target) according to the embodiment of the present invention.

FIG. 6 is a graph showing a frequency characteristic of a high-frequency amplifier that is changed with a movement of a track position.

FIG. 7 is a flowchart showing a data write procedure in the disk device.

FIG. 8 is a graph showing a relationship between a disk rotation speed, a recording / reproducing frequency, and a sector length in relation to a track position of a disk in a CLV system and a CAV system.

FIG. 9 shows a configuration of an access time for a CD-ROM:
FIG. 9 is a graph showing a relationship between a PU movement time, a time required to reach a specified number of revolutions, and a time required to reach a start point of a desired sector position on a target track.

[Explanation of symbols]

1 ... CD-ROM (disk-shaped record carrier), 1m ... MD (disk-shaped record carrier), 2 ... SP motor (rotation drive means), 3 ...
SP servo circuit (rotation driving means), 3a, 8a, 23a PLL circuit, 4 PU (read unit), 5 PU driver (read unit),
6 PU servo circuit (tracking means) 7 RF amplifier (amplifier) 8 Signal detection circuit (signal detection means) 9 EF
M demodulation circuit, 10 ... CD-ROM decoder, 11 ... SCS
I control unit, 12: MPU (control means), 12a: control table
(Storage means), 21 ... MD decoder / encoder, 22 ... E
FM modulation circuit, 23 ... address detection circuit (address detection means), 24 ... decoder, 25 ... write synchronization circuit (synchronization means), 2
6 head driver (write unit), 27 magnetic head (write unit), 28 PU / head servo circuit (tracking means), 31 phase comparator, 32 charge pump, 33 VC
O, 34: frequency divider, Dt: track position data, Df (1) to
Df (36), Df (1) to Df (24) ... frequency characteristic control data, Dc
(1) to Dc (36), Dc (1) to Dc (24), Dca (1) to Dca (24) ... Charge pump control data, Dd (1) to Dd (36), Dd (1) to D
d (24), Dda (1) to Dda (24): frequency division ratio control data.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 20/10 321

Claims (2)

(57) [Claims] 1. A disk drive, comprising: a disk-shaped record carrier on which data is recorded in accordance with a constant linear velocity system; a rotation driving means for rotating the record carrier at a constant angular velocity; and a track of the record carrier. Tracking means for controlling the positioning of the reading unit with respect to the amplifier, an amplifier for amplifying the signal read from the record carrier by the reading unit and having a variable frequency characteristic, and detecting the read signal amplified by the amplifier as digital data Signal detection means whose detection clock frequency is variable and corresponding to the track position data of the record carrier,
Frequency characteristic control data for controlling the high gain frequency band of the amplifier in accordance with the track position and a reading speed determined by the rotational angular velocity of the rotation driving means, and a detection clock frequency for controlling the detection clock frequency of the signal detection means. Based on the track position data controlled by the tracking means, the frequency characteristic control data and the detected clock frequency control data corresponding to the track position data in the storage means based on the track position data controlled by the tracking means. A disk device comprising a control unit for controlling the amplifier and the signal detection circuit. 2. A disk drive, comprising: a disk-shaped record carrier on which addresses have been recorded in advance based on a constant linear velocity method; a rotation driving means for driving the record carrier to rotate at a constant angular velocity; Tracking means for controlling the position of a write / read unit with respect to a track; an amplifier for amplifying an address signal read from the record carrier by the write / read unit and having a variable frequency characteristic; and an address amplified by the amplifier. An address detecting means for detecting a signal as digital data and a detection clock frequency of which is variable; and a reading speed determined by the track position and a rotation angular velocity by the rotation driving means in correspondence with the track position data of the record carrier. Frequency characteristic control for controlling the high gain frequency band of the amplifier Storage means for storing control data and detection clock frequency control data for controlling a detection clock frequency of the address detection means; and track position data stored in the storage means based on track position data controlled by the tracking means. Control means for controlling the amplifier and the address detection circuit using the frequency characteristic control data and the detected clock frequency control data corresponding to the control signal, and synchronization for synchronizing the write section based on the address data detected by the address detection means. A disk device comprising means.