JPH0765526A - Stiction prevention device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a stiction prevention device for preventing stiction between a magnetic disk and a head slider when the magnetic disk device is stopped. [Structure] In the magnetic disk device 10, a stiction prevention device is configured such that mechanisms 6a and 12 for separating the head slider 7 from the magnetic disk surface are provided on the inner peripheral side of the magnetic disk 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mass storage device for an information processing device, and more particularly to a stiction preventing device at the time of starting and stopping a rotary disk type storage device such as a magnetic disk or an optical disk.

[0002]

2. Description of the Related Art Conventionally, a so-called CSS (contact start stop) type magnetic disk device is shown in FIG.
It is configured as shown in FIG. In FIG. 11, a magnetic disk device 1 includes a magnetic disk 2 that is rotationally driven,
An actuator 3 for supporting the head slider so as to move in the radial direction while slightly flying above the surface of the magnetic disk 2.

The actuator 3 is, as shown in the figure,
An arm 5 movably supported around the rotary shaft 4, a head slider 7 supported by a tip of the arm 5 via a suspension 6 and an arm 5 supported by the rotary shaft 4
And a voice coil 8 which is driven to rotate around.

The magnetic disk drive 1 thus constructed
According to this, when the magnetic disk 2 is stopped, the head slider 7 is in contact with the surface of the magnetic disk 2, and when the magnetic disk 2 starts to rotate, the head slider 7 floats accordingly. It has become.

[0005]

However, in the CSS type magnetic disk device 1 thus constructed, the head slider 7 is always in contact with the surface of the magnetic disk 2 when the magnetic disk device 1 is stopped. . For this reason, the attraction phenomenon between the head slider 7 and the magnetic disk 2 (hereinafter referred to as stiction) may occur.

This stiction is caused by the head slider 7
It tends to occur in proportion to the contact time of the magnetic disk 2 with the surface of the magnetic disk 2. As a countermeasure against this, a texture that roughens the surface of the magnetic disk 2 is formed. This is to reduce the flying height of the head slider 7 from the magnetic disk surface as much as possible so that the head slider 7 serves as a magnetic film of the magnetic disk 2. It goes against the basic demand for magnetic recording that is being approached. Therefore, the formation of such a texture is an obstacle to the realization of a high recording density.

In view of the above points, it is an object of the present invention to provide a stiction prevention device which prevents stiction between a magnetic disk and a head slider when the magnetic disk device is stopped. .

[0008]

According to the present invention, there is provided a driving means for driving a rotary information recording disk,
An arm that supports the head slider so as to be movable along the surface of the disk through a suspension, a voice coil type drive mechanism that drives the arm, and a disk-head slider to prevent the disk-adhesion phenomenon. This is achieved by a stiction prevention device having a mechanism for separating the head slider from the disk surface on the inner peripheral side of the disk.

The stiction prevention device according to the present invention is
Preferably, the mechanism for separating the head slider from the disk surface on the inner peripheral side of the disk comprises a cam member rotationally symmetric with respect to the rotation axis of the spindle motor as the driving means, and a cam follower attached to the suspension. The cam member is designed to rotate integrally with the magnetic disk.

The stiction prevention device according to the present invention is
Preferably, a cam member is integrally formed on the inner peripheral surface of the disc.

The stiction prevention device according to the present invention is
Preferably, the cam member is formed on the clamper for fixing and holding the disk of the magnetic disk device.

The stiction prevention device according to the present invention is
Preferably, the head slider is separated from the disk surface at the inner circumference of the disk when the disk is stopped.

The stiction prevention device according to the present invention is
Preferably, when the disk is rotating, the head slider is separated from the disk surface at the inner circumference of the disk.

[0014]

According to the above construction, when the operation of the magnetic disk device is stopped, the head slider is moved to the inner peripheral side of the magnetic disk, so that the head slider is moved from the surface of the magnetic disk by a mechanism such as a cam surface. To be separated. This shortens the contact time between the magnetic disk surface and the slider.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIGS. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 shows a first embodiment of a magnetic disk device incorporating a stiction prevention device according to the present invention. In the figure, a magnetic disk device 10 includes a magnetic disk 2 that is rotationally driven, and an actuator 3 that supports a head slider so as to move in a radial direction while slightly flying above the surface of the magnetic disk 2. I'm out.

This actuator 3 is, as shown,
An arm 5 movably supported around the rotary shaft 4, a head slider 7 supported by a tip of the arm 5 via a suspension 6 and an arm 5 supported by the rotary shaft 4
It has a voice coil 8 which is driven to rotate around and a permanent magnet which is arranged at a predetermined position with respect to the voice coil 8.

Here, the magnetic disk 2 is driven to rotate by a spindle motor 9.
In this case, the spindle motor 9 is a generic term for a unit including a clamper, a flange and the like.

The above-described structure is similar to that of the conventional magnetic disk device 1 shown in FIG. 11, but in the magnetic disk device 10 according to this embodiment, the cam follower 1 extending from the tip of the suspension 6 of the actuator 3 thereof.
1 and a cam member 12 provided on the inner peripheral side of the magnetic disk 2.

The cam member 12 is formed in a slope shape whose thickness gradually increases toward the inner peripheral edge of the magnetic disk 2.

FIG. 2 is an enlarged side view showing the vicinity of the cam member 12. In FIG. 2, the cam member 12 is
A thick and flat upper surface 12a on the inside and the upper surface 12a
And a slanted surface 12b formed in a truncated cone shape so as to gradually become thinner outward in the radial direction. Although the upper surface 12a is flat in the illustrated case, the upper surface 12a may be more surely held by the cam follower 6a.
It may be formed in a slightly concave shape.

Further, FIG. 3 shows the magnetic disk device 10 described above.
3 shows an example of the configuration of the control unit 13 for driving and controlling the. In FIG. 3, the control circuit 13 as a control unit includes a microprocessor 14 and a driver IC 15.

The microprocessor 14 comprises a mode controller 14a, a spindle sequencer 14b, a D / A converter 14c and a buffer 14d. The driver IC 15 also includes a spindle driver 15a and a VCM driver 15b.

Here, the mode controller 14a receives the servo signal and the output signal of the spindle sequencer 14b to control the operation mode of the actuator 3 and to rotate the magnetic disk 2 by the spindle motor 9a.
Controls the rotation stop and start modes of the.

The spindle sequencer 14b is an output signal of the mode controller 14a and the spindle driver 1
The rotation speed of the spindle motor 9 is selected in response to the feedback signal from 5a. Thus, the spindle driver 15a receives the speed signal from the spindle sequencer 14b and drives the spindle motor 9.

The D / A converter 14c also converts the digital signal from the mode controller 14a into an analog signal. The buffer 14d is the D / A converter 14
It is a preamplifier for inputting the analog output signal from c to the VCM driver 15b. Thus, this VCM
The driver 15b receives the signal from the buffer 14,
The actuator 3 is driven.

The magnetic disk drive 10 according to this embodiment is
With the configuration as described above, when the magnetic disk device 10 is stopped, the cam follower 6a is arranged on the high portion 12a of the cam member 12 by the actuator 3. As a result, the head slider 7 is separated from the surface of the magnetic disk 2.

When operating the magnetic disk drive 10 from this state, the control circuit 13 drives the actuator 3 to move the cam follower 6a in the R1 direction along the slope 12b of the cam member 12. As a result, the cam follower 6a descends in the vertical direction, and the head slider 7 moves the magnetic disk 2
Land on the surface of.

After that, as shown in FIG. 4, the control circuit 13
Thus, the magnetic disk 2 is rotationally driven by rotationally driving the spindle motor 9, and the head slider 7 slightly floats above the surface of the magnetic disk 2.

When the magnetic disk device 10 is stopped,
After the actuator 3 is rotationally driven by the control circuit 13 to move the head slider 7 to the inner circumference side of the magnetic disk 2, the control circuit 13 causes the spindle motor 9 to move as shown in FIG. Rotation is stopped.

As a result, the rotation of the magnetic disk 2 is stopped and the head slider 7 lands on the surface of the magnetic disk 2. After that, by driving the actuator 3,
The cam follower 6a is moved in the R2 direction along the slope 12b of the cam member 12. Thus, the head slider 7 is separated from the surface of the magnetic disk 2, and the cam follower 6a is placed on the upper surface 12a of the cam member 12.

In the magnetic disk device 10 described above, the head slider 7 is landed on or separated from the surface of the magnetic disk 2 in the state where the spindle motor 9 is stopped in the same manner as the conventional CCS method. For example, the head slider 7 can be landed on or separated from the surface of the magnetic disk 2 while the spindle motor 9 is rotating.

In this case, as shown in FIG. 6, the head slider 7 is landed on the surface of the magnetic disk 2 after the number of rotations of the magnetic disk 2 reaches a value at which the head slider can fly. Therefore, the rotation speed of the magnetic disk 2 is not affected by the loading of the head slider 7,
Continues stable rotation.

Further, as shown in FIG. 7, the magnetic disk 2
Of the head slider 7 becomes lower than the number of revolutions at which the head slider can fly (flying number of revolutions).
Separate from the surface of the magnetic disk 2. Therefore, the rotational speed of the magnetic disk 2 is not affected by the unloading of the head slider 7, and the stable rotation continues.

FIGS. 8 to 10 show a second embodiment of a magnetic disk device incorporating a stiction prevention device according to the present invention. In FIG. 8, in the magnetic disk device 20, the cam member 12 is attached from above and below the magnetic disk 2, and the clamper 21 holds the magnetic disk 2 to the spindle motor 9 in a fixed manner.
It is fixed on both sides of this magnetic disk 2.

FIG. 9 shows a third embodiment. In FIG. 9, the magnetic disk device 30 is different from the magnetic disk device 20 in that the cam members 12 are integrally formed on both surfaces of the magnetic disk 2.

FIG. 10 shows a fourth embodiment. Figure 1
At 0, the magnetic disk device 40 has the cam member 12
Are integrally formed with the spindle motor 9 and the clamper 41, respectively. These magnetic disk devices 2
In any of the cases of 0, 30, and 40, the operation is similar to that of the magnetic disk device 10 shown in FIG.

It should be noted that the head slider 7 is moved to the magnetic disk 2 while the magnetic disk 2 is rotating at a speed lower than the flying speed.
It is obvious that the landing surface and the landing surface may be separated from each other.

[0039]

As described above, according to the present invention, the head slider and the magnetic disk can be separated from each other when the magnetic disk device is stopped, so that the contact time between the head slider and the disk is significantly shortened. , Or eliminated. Therefore, stiction between the head slider and the magnetic disk is prevented, and the reliability of the magnetic disk device can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic disk device incorporating a stiction prevention device according to the present invention.

FIG. 2 is a partially enlarged side view showing a main part of the magnetic disk device shown in FIG.

3 is a block diagram showing a configuration example of a control unit of the magnetic disk device of FIG.

FIG. 4 is a graph showing the change over time in the rotational speed of the magnetic disk when the magnetic disk device of FIG. 1 is started up.

5 is a graph showing the change over time in the number of revolutions of the magnetic disk when the magnetic disk device shown in FIG. 1 is stopped.

6 is a graph showing the change over time in the number of rotations of the magnetic disk when the head is loaded with the spindle motor of the magnetic disk device shown in FIG. 1 being rotated.

7 is a graph showing the change over time in the number of rotations of the magnetic disk during head unloading with the spindle motor of the magnetic disk device of FIG. 1 rotated.

FIG. 8 is a second example of the stint prevention device according to the present invention.
FIG. 3 is an exploded side view showing the main parts of the embodiment of FIG.

FIG. 9 is a third example of the stint prevention device according to the present invention.
FIG. 3 is an exploded side view showing the main parts of the embodiment of FIG.

FIG. 10 is an exploded side view showing the main parts of a fourth embodiment of the stinking prevention device according to the present invention.

FIG. 11 is a perspective view showing an example of a conventional magnetic disk device.

[Explanation of symbols]

 1 magnetic disk device 2 magnetic disk 3 actuator 4 rotary shaft 5 arm 6 suspension 7 head slider 8 voice coil 9 spindle motor 10 magnetic disk device 11 cam follower 12 cam member 13 control circuit 14 microprocessor 15 driver IC 20 magnetic disk device 21 clamper 30 Magnetic disk unit 40 Magnetic disk unit 41 Clamper

Claims (6)

[Claims] 1. A drive means for driving a rotary information recording disk, an arm for supporting a head slider movably along a surface of the disk via a suspension, and a voice coil type drive mechanism for driving the arm. A stiction prevention device comprising a mechanism for separating the head slider from the disk surface on the inner peripheral side of the disk in order to prevent the disk and the head slider from being attracted to each other. 2. A mechanism for separating the head slider from the disk surface on the inner peripheral side of the disk, a cam member rotationally symmetric with respect to a rotation axis of a spindle motor as the driving means, and a cam follower attached to the suspension. The stiction prevention device according to claim 1, wherein the cam member rotates integrally with the magnetic disk. 3. The stiction prevention device according to claim 2, wherein the cam member is integrally formed on an inner peripheral surface of the disk. 4. The stiction prevention device according to claim 2, wherein the cam member is formed on a clamper for fixing and holding a disk of a magnetic disk device. 5. The stiction prevention device according to claim 2, wherein the head slider is separated from the disk surface at the inner circumference of the disk when the disk is stopped. 6. The stiction prevention device according to claim 2, wherein the head slider is separated from the disk surface at the inner circumference of the disk when the disk is rotating.