JPH1145495A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk driving device low in power consumption and manufacturing cost. SOLUTION: When a magnetic disk 30 is loaded, a spindle motor driver 8 generates a clock signal CK1 to revolve a spindle motor 7 at the stationary revolving speed (3600 rpm) of the reading/writing of data based on the clock CK1. At a standby time, the driver 8 generates a clock CK2 based on a standby signal from a DMC 3 to revolve the motor 7 at a revolving speed lower than the stationary revolving speed, for example, at 50 rpm based on the clock CK2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk drive device for preventing a magnetic head from sticking to a magnetic disk.

[0002]

2. Description of the Related Art At present, a high-density floppy disk (hereinafter, referred to as "high-density FD") capable of recording data of a larger capacity than a so-called 2HD standard floppy disk and a disk drive device for such a high-density FD Has been proposed.

However, since the high-density FD and the magnetic head of the disk drive have a small surface roughness, if the magnetic head is stationary on the high-density FD for a long time, it sticks to the high-density FD. Problems arise.

[0004] In order to prevent such a sticking problem, the above-mentioned disk drive device is capable of bringing a magnetic head into a non-contact state with a high-density FD by flowing a predetermined current through a solenoid coil. It has an unload mechanism.

However, when a solenoid coil and a head unloading mechanism are provided in a hard disk drive, there arises a problem that the size becomes larger and the production cost increases.

On the other hand, in a hard disk drive device having a relatively high recording density, in order to prevent the above-mentioned sticking problem, the hard disk is rotated at the same speed as when reading / writing data, or the magnetic head is moved to the hard disk drive. Or moving it over a part with a large surface roughness.

[0007]

However, similar to the disk drive for a hard disk, the high-density FD
In a conventional disk drive device, when the high-density FD is rotated at the same speed as that for reading / writing data, there is a problem that power consumption is increased as compared with the conventional disk drive device.

Further, similarly to the hard disk, the high density F
D may be provided with a portion having a large surface roughness, and the magnetic head may be moved over such a portion to avoid sticking. However, a manufacturing process for forming a portion having a large surface roughness in a high-density FD is considered. Increase the production cost.

The present invention has been proposed in view of the above circumstances, and has as its object to provide a disk drive device that consumes less power and has no manufacturing cost.

[0010]

In order to solve the above-mentioned problems, a disk drive according to the present invention is a disk drive for recording / reproducing data on / from a magnetic disk, in which the magnetic disk is rotated. A spindle motor; and spindle motor driving means for driving the spindle motor at a predetermined rotation speed when data recording / reproduction is not performed.

That is, in the disk drive device, the spindle motor is driven so as to make a predetermined number of rotations when recording / reproducing data, and less than the predetermined number when not recording / reproducing data. The spindle motor is driven so as to rotate by a number.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is to prevent the magnetic head from sticking to the magnetic disk,
The present invention can be applied to the disk drive device shown in FIG.

As shown in FIG. 1, the disk drive device comprises a magnetic head 1 for reading data recorded on a magnetic disk 30 and a read / write channel IC 2.
, A disk motor controller (hereinafter referred to as “DMC”) 3 for controlling various drivers, and a magnetic head 1
, A VCM driver 6 for driving the VCM 5, a spindle motor 7 for rotating the magnetic disk, and a rotational drive for the spindle motor 7. A spindle motor driver 8 for controlling the magnetic disk 30, a disk detector 9 for detecting whether or not the magnetic disk 30 is loaded,
A hard disk controller (hereinafter, referred to as “HDC”) 10 and a host computer 11 are provided.

The magnetic head 1 reads data recorded on the magnetic disk 30 and supplies the data to a read / write channel IC 2. The read / write channel IC2 amplifies the read data, performs a filtering process, and supplies the amplified data to the DMC 3 and the HDC 10.

DMC 3 has a read / write channel I
The VCM 5 is controlled via the VCM driver 6 so that the magnetic head 1 is positioned on the recording track of the magnetic disk 30 according to the data output from C2. Also, DMC3
When a disk-in signal is supplied from the disk detector 9, the master clock MCK, the motor-on signal,
The standby signals are sequentially generated, and the number of rotations of the spindle motor 7 is controlled via the spindle motor driver 8.

The spindle motor driver 8 includes a DM
In addition to the motor-on signal and standby signal from C3, the number of revolutions of the spindle motor 7 is controlled based on the FG signal indicating the number of revolutions from the spindle motor 7.

Specifically, as shown in FIG. 2, the spindle motor driver 8 includes a frequency divider 21 and a frequency divider 22 for dividing the master clock MCK, and a frequency divider 21 or a frequency divider 22. Switching circuit 23 for switching and outputting the clock of
A speed comparison circuit 24 that compares the speed of the clock and the FG signal output from the switching circuit 23; and a servo circuit 25 that controls the spindle motor 7 according to the output of the speed comparison circuit 24.

The frequency divider 21 frequency-divides the master clock MCK by a predetermined number, and outputs a clock C for reading / writing data.
K1 is output. The frequency divider 22 is also connected to the master clock MC
K is divided by a specific number, and a clock C output from the frequency divider 21
A clock CK2 having a lower frequency than K1 is output.

The switching circuit 23 is switched and set by a standby signal generated in the DMC 3. More specifically, the switching circuit 23 is set to the terminal a when no standby signal is generated, that is, when data is read / written, and when the standby signal is generated, that is, when data is read / written. Otherwise, it is set to terminal b. Therefore, the switching circuit 23 supplies the clock CK1 to the speed comparison circuit 24 when reading / writing data, and supplies the clock CK2 when not reading / writing data.

The speed comparison circuit 24 includes a spindle motor 7
Is compared with the frequency of the clock from the switching circuit 23, and an error signal indicating an error of the frequency is supplied to the servo circuit 25.

The servo circuit 25 is driven while the H-level motor-on signal is being supplied. That is,
When the motor-on signal is supplied, the servo circuit 25 controls the rotation speed of the spindle motor driver 8 based on the error signal from the speed comparison circuit 24 so as to cancel the error. Further, when the motor-on signal is not supplied, the servo circuit 25
Stop the rotation of.

The HDC 10 responds to a read / write command from the host computer 11 to read the DMC 3
The magnetic head 1 is controlled to read / write data via the write channel IC2.

When the magnetic disk 30 is loaded in the disk drive configured as described above, the disk detector 9 supplies a disk-in signal shown in FIG.

When the DMC 3 is supplied with the disc-in signal, as shown in FIG. 3, the master clock MCK,
A motor-on signal is sequentially generated and supplied to the spindle motor driver 8.

In the spindle motor driver 8, since the switching circuit 23 is set to the terminal a, the speed comparison circuit 2
4 is supplied with a clock CK1. Speed comparison circuit 24
When the motor-on signal is supplied, an error signal between the FG signal and the clock CK1 is output and supplied to the servo circuit 25. The servo circuit 25 controls the rotation speed of the spindle motor 7 based on the error signal. At this time, the servo circuit 25 rotates the spindle motor 7 at a steady rotational speed (3600 rpm) for reading / writing data, for example.

As shown in FIG. 3, the DMC 3 generates a standby signal after the output of the motor-on signal and after a lapse of a predetermined time, and supplies the standby signal to the spindle motor driver 8.

In the spindle motor driver 8, the switching circuit 23 is set to a terminal b based on the standby signal, and the clock CK2 is supplied to the speed comparison circuit 24.

The servo circuit 25 controls the rotation speed of the spindle motor 7 based on an error signal between the FG signal and the clock CK2 via the speed comparison circuit 24. At this time, the servo circuit 25 rotates the spindle motor 7 at a rotation speed smaller than the steady rotation speed, for example, 50 rpm.

As described above, when the magnetic disk is in a standby state, that is, when data is not read / written, as shown in FIG. 4, the disk drive device operates at a rotation speed smaller than the normal rotation speed. By rotating the magnetic disk 30, the magnetic head 1
Can be prevented.

Further, in the above disk drive device, the magnetic disk 30 is rotated at a lower rotation speed than the normal rotation speed in order to prevent sticking. Can be planned.

Further, the disk drive device changes the frequency of the clock so that the magnetic disk 30
Since the number of rotations is controlled, there is no need to provide a special mechanical mechanism, and it is possible to avoid an increase in size for controlling the number of rotations and to improve workability during manufacturing.

Next, another embodiment of the disk drive device will be described. The circuit configuration of the disk drive device is almost the same as that of the above-described embodiment. However, the frequency divider 22 is not provided in the spindle motor driver 8, and the switching circuit 23 is always set to the terminal a. It is assumed that

When the DMC 3 is supplied with the disc-in signal, the master clock MCK,
A motor-on signal is sequentially generated and supplied to the spindle motor driver 8.

In the spindle motor driver 8, the speed comparison circuit 24 outputs the FG signal and the master clock MCK.
And outputs an error signal from the frequency-divided clock CK1 to the servo circuit 25. The servo circuit 25 includes a motor
When the ON signal is supplied, the spindle motor 7 is controlled based on the error signal so that the spindle motor 7 has a steady rotation speed.

The DMC 3 outputs a motor-on signal, generates a standby signal after a predetermined time has elapsed, and supplies the standby signal to the spindle motor driver 8 as shown in FIG. In the spindle motor driver 8, when the standby signal is supplied, the servo circuit 25 inverts the polarity of the motor-on signal and stops the rotation of the spindle motor 7. Then, as shown in FIG. 5, the servo circuit 25 controls on / off of the rotation of the spindle motor 7 at a predetermined cycle while the standby signal is at the L level. That is, as shown in FIG. 5, the spindle motor 7 is driven at a steady speed when the motor-on signal is at the L level and the standby signal is at the H level, and the motor-on signal is at the L level and the standby signal is also at the L level.
When it is at the level, the rotation is turned on / off at the above-mentioned predetermined cycle and at a steady speed or less.

As described above, the spindle motor driver 8
In the standby state, the spindle motor 7 is rotated at a rotation speed lower than the steady rotation speed, for example, 50 rpm,
Or stop it.

As described above, when the magnetic disk is in a standby state, that is, when data is not read / written, as shown in FIG. 6, the disk drive device operates at a rotational speed smaller than the normal rotational speed. By rotating or stopping the magnetic disk 30, the magnetic head 1 can be prevented from sticking to the magnetic disk 30.

Further, since the disk drive device is turned on / off at a rotation speed lower than the normal rotation speed to prevent sticking, power saving is achieved as compared with the case where the disk drive device is rotated at the normal rotation speed. Can be planned.

As in the above-described embodiment, the disk drive does not need to be provided with a special mechanical mechanism. Can be better.

It should be noted that the present invention is not limited to the above-described embodiment, and that various design changes can be made within the scope of the technical idea described in the claims. Needless to say.

For example, the frequency divider 21, the frequency divider 22, the switching circuit 23, and the speed comparison circuit 24 may be provided in the DMC 3 instead of the spindle motor driver 8, or a circuit for generating the clocks CK1 and CK2 may be provided separately. Of course.

[0042]

As described above in detail, according to the disk drive device of the present invention, when recording / reproducing data, the spindle motor is driven so as to rotate a predetermined number of times to record / reproduce data. When not performed, the power consumption can be reduced as compared with rotating the magnetic disk at the same rotation speed as when reading / writing data for driving the spindle motor so that the magnetic head rotates at a rotation speed smaller than the predetermined number. It is possible to prevent the magnetic disk from sticking.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk drive device to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a drive motor controller of the disk drive device.

FIG. 3 is a time chart for explaining an operation when rotating a spindle motor of the disk drive device.

FIG. 4 is an explanatory diagram of a steady rotation speed and a standby rotation speed of the spindle motor.

FIG. 5 is a time chart for explaining an operation when rotating a spindle motor of the disk drive device.

FIG. 6 is an explanatory diagram of a steady rotation speed and a rotation speed during standby of the spindle motor.

[Explanation of symbols]

1 magnetic head, 3 DMC, 7 spindle motor,
8 spindle motor driver, 10 HDC, 11
Host computer

Claims (3)

[Claims] 1. A disk drive for recording / reproducing data on / from a magnetic disk, comprising: a spindle motor for rotating the magnetic disk; and a motor for rotating at a predetermined rotation speed when recording / reproducing data. Drive the spindle motor to record /
A disk drive device comprising: a spindle motor driving unit that drives the spindle motor so that the spindle motor rotates at a rotation speed lower than the predetermined number when reproduction is not performed. 2. A clock generating means for generating high-frequency and low-frequency clocks, wherein the spindle motor driving means, based on a high-frequency clock generated by the clock generating means, when recording / reproducing data. The spindle motor is driven to rotate at the predetermined number of rotations, and when data recording / reproduction is not performed, the spindle motor rotates at a rotation number lower than the predetermined number based on a low frequency clock generated by the clock generation means. 2. The disk drive device according to claim 1, wherein the spindle motor is driven so as to perform the operation. 3. When the data is not recorded / reproduced, the spindle motor driving means turns on / off the spindle motor at a predetermined cycle to rotate at a rotation number smaller than the predetermined number. 2. The disk drive device according to claim 1, wherein the spindle motor is driven as described above.