JPH0612802A - Disk device - Google Patents

Abstract

PURPOSE:To eliminate the attraction and the collision of a head at the time of starting/stopping by providing a lift-up mechanism raising the disk from a head at the time of turning a power source off and lowering the head at the time of turning the power source on. CONSTITUTION:The lift-up mechanism 13 is composed of a crank arm 15, a driving shaft 16, a shape memory alloy spring 18, etc. When the power source is turned off, a floating head 11 is moved in the inmost periphery of the disk and the crank arm 15 is driven in the direction of the arrow C' then a suspention 10 is pressed up. On the other hand, when the device is started at the time of turning the power source on, the shape memory alloy spring 18 is heated at about 80 deg.C and the crank arm 15 is driven and rotated to a prescribed lowering position in the direction of an arrow C through stress generated by the spring 18. The suspention 10 is lowered to the prescribed position, and thereafter, the suspention 10 is floated to a height of about 0.1-0.2mum, and so, an unexpected collision at the time of starting is not occurred at all.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device most suitable for application to a magnetic disk device for recording and / or reproducing a disk such as a magnetic disk.

[0002]

2. Description of the Related Art Conventionally, in a magnetic disk device for recording and / or reproducing a magnetic disk such as a hard disk,
For example, CS found in Japanese Patent Publication No. 60-16023
S (Contant Stavt Stop) method and US Pat.
CSS-Free (Contact S
There are two methods, tart stop free method.

In the CSS system, when the power supply is stopped (power off), the suspension arm of the head arm elastically urges the levitation arm to land on (contact) the landing zone formed on the innermost circumference of the magnetic disk. ), And at the start by supplying power (power-on), the flying head resists the elastic urging force of the suspension by the pressure of the air flow generated by the rising of the rotation of the magnetic disk, This is a system in which the flying head is moved to the data recording zone of the magnetic disk after the loading so as to be levitated to about 1 to 0.2 μm, and the recording / reproducing is performed.

In the CSS-free system, the flying head is mechanically lifted upward from the magnetic disk during rotation of the magnetic disk at the time of stop, and the magnetic disk is rotated after the rotational speed of the magnetic disk rises at the time of start. This is a system in which the flying head is mechanically lowered to a flying position with respect to the magnetic disk by balancing with the pressure of the air flow generated by the.

[0005]

[Problems to be Solved by the Invention] However, the conventional CSS
In the method, the flying head and the magnetic disk slide and wear at every start / stop, and the contact surfaces of these become mirror-finished, and when the friction coefficient exceeds the starting torque of the spindle motor, the flying head is magnetically moved. It will stick to the disk and you will not be able to rotate the magnetic disk. Further, even when a minute foreign substance such as oil or water droplets enters between the flying head and the magnetic disk at the time of stop, the flying head is adsorbed on the magnetic disk, which also makes it impossible to start.

Further, in the CSS-free method, since the flying head is lowered with respect to the magnetic disk at the time of rotation of the magnetic disk at the time of start, the flying head unexpectedly moves on the magnetic disk due to changes in the attitude of the flying head and vibrations. There was a problem that both sides were apt to be damaged due to collision.

The present invention has been made in order to solve the above problems, and provides a disk device capable of solving the problems of the attraction phenomenon and collision between the flying head and the disk at the time of start / stop. Is intended.

[0008]

In order to achieve the above-mentioned object, a disk apparatus of the present invention mounts a floating head on the tip of a head arm via a suspension, and rotates the disk to float the floating head from the disk. In a CSS type disk device configured to land the floating head on the disk when the disk is stopped, the floating head is lifted from the disk by cutting off the current, and the floating head is moved onto the disk by turning on the current. It is equipped with a lift-up mechanism for lowering to. At this time, the lift-up mechanism lowers the flying head by a shape memory alloy spring operated by energization, the lift-up mechanism includes a latch mechanism for holding the flying head in a lowered state, and the lift-up mechanism. Preferably includes means for operating the latch mechanism by utilizing wind pressure generated by the rotation of the disk.

[0009]

The disk device of the present invention having the above-described structure is provided with a lift-up mechanism for a CSS type disk device, in which the flying head is lifted from the disk by disconnecting the current and the flying head is lowered by the current. Since it is equipped, the floating head can be lifted from the stopped disk at the time of stop, and at the time of start,
The flying head can be levitated from the disk by utilizing the pressure of the air flow generated by the rotation of the disk.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic disk device to which the present invention is applied will be described below with reference to the drawings.

First, the entire CSS type magnetic disk device 1 will be described with reference to FIG.

A magnetic disk 5 such as a hard disk, which is a disk rotatably driven by a vertical spindle 4 of a spindle motor 3, is housed in a chassis 2 which constitutes a shallow box-shaped hermetic case. Also, this chassis 2
A head arm 9 is housed therein, which is swingably driven by a voice coil motor 7 about a vertical arm shaft 8. A suspension 10 made of a leaf spring is attached to the tip of the head arm 9, and a flying head 11 is attached to the tip of the suspension 10 via a gimbal (not shown). It should be noted that the spindle 4 has 1
˜Several magnetic disks 5 are attached at intervals in the vertical direction, and a pair of upper and lower flying heads 11 and suspensions 10 are attached to one magnetic disk 5 on the head arm 9.

The magnetic disk 5 is rotationally driven in the direction of arrow a by the spindle motor 3 at a high speed, and a pair of upper and lower flying heads 11 are moved from the upper and lower surfaces of the magnetic disk 5 by 0.1 due to the pressure of the air flow generated at that time. ~ 0.
The suspension 10 is lifted up to about 2 μm against the elastic biasing force of the suspension 10. Then, the voice coil motor 7 swings the head arm 9 around the arm shaft 8 in the directions of arrows b and b ', and the upper and lower flying heads 11 record the upper and lower surfaces of the data recording zone of the magnetic disk 5. It is something to play.

Next, the lift-up mechanism 13 incorporated in the CSS type magnetic disk device 1 will be described with reference to FIGS.

The lift-up mechanism 13 includes a chassis 2
A base 14 mounted on the top, and a crank arm 15 having a lift arm 15a attached to the tip of the base 14 rotatably in the directions of arrows c and c ',
A drive shaft 16 rotatably driving the crank arm 15 mounted movably in the directions of the arrows d and d ′ along the groove 14 a of the base 14, a slider 17 fixed to the drive shaft 16, and the slider 17 are indicated by arrows. A compression coil spring-shaped shape memory alloy spring 18 driven in the d direction, a compression coil spring 19 made of an ordinary steel wire for biasing the slider 18 in the direction of the arrow d ', and a fulcrum shaft 2 on the base 14.
And a wind pressure lever 21 that is a latch mechanism operating means that is rotatably attached in the directions of arrows e and e ′ through 0 and is arranged in the vicinity of the surface of the magnetic disk 5, and that wind pressure lever 21 is in the direction of arrow e ′. It is composed of a tension coil spring 22 made of a normal steel wire that is biased in the backward direction, and a latch mechanism 23 composed of the slider 17 and a latch arm 21a of the wind pressure lever 21. The lift-up mechanism 13 is provided as a pair of upper and lower sides with respect to one magnetic disk 5 and is arranged on the inner peripheral side of the magnetic disk 5.

A landing zone 5b is formed at the innermost circumference of the data recording zone 5a formed on both upper and lower surfaces of the magnetic disk 5.

Next, the start / stop operation of the magnetic disk device 1 will be described.

First, in the stop state due to power-off (power-off), as shown in FIG. 1, the flying head 11 is moved in the direction of arrow b to the landing zone 5b formed on the innermost circumference of the magnetic disk 5, Suspension 1
0 is mounted on the lift arm 15a of the crank arm 15 at a right angle.

At this time, as shown in FIG. 2, the wind pressure lever 2
1 is returned by the tension coil spring 22 in the direction of arrow e ', the latch arm 21a of the latch mechanism 23 is released from the slider 17, and the slider 17 and the drive shaft 16 are integrally returned by the compression coil spring 19 in the direction of arrow d'. Have been moved. Then, as shown by the one-dot chain line in FIG. 4, the crank arm 15 is rotationally driven in the direction of arrow c ′ to the raised position, and as shown by the solid line in FIG.
The suspension arm 10 is pushed upward by the lift arm 15a against the elasticity in the upward arrow f'direction.

As a result, as shown in FIG. 6A, the flying head 11 moves the landing zone 5 of the magnetic disk 5.
At b, it is lifted up (lifted up) to a predetermined height position H ₁ above the magnetic disk 5.

Next, at the start by supplying power (power on), as shown in FIG. 3, the shape memory alloy spring 18 is used.
This shape memory alloy spring 18 is heated to about 80 ° C
The shape memory alloy spring 18 is restored to the original compression coil spring, and the stress of the shape memory alloy spring 18 overcomes the stress of the compression coil spring 19, and the slider 17 is compressed by the shape memory alloy spring 18. It slides in the direction of arrow d against 19.

Then, the drive shaft 1 is integrated with the slider 17.
6 is moved in the direction of arrow d, the crank arm 15 is rotationally driven in the direction of arrow c to the lowered position as shown by the solid line in FIG. 4, and the lift of the crank arm 15 is shown by the chain line in FIG. The arm 15a moves away from the suspension 10 in the downward direction of the arrow f, and the elastic restoring force of the suspension 10 causes the suspension 10 to move toward the arrow f.
Is lowered in the direction.

On the other hand, simultaneously with the power supply, the spindle motor 3 starts rotating the magnetic disk 5 in the direction of arrow a in FIG.

Therefore, as shown in FIG. 6B, the flying head 11 is landed (lifted down) on the landing zone 5b of the magnetic disk 5 from the direction of arrow f almost at the same time when the magnetic disk 5 starts to rotate. This is the so-called contact start state.

Then, when the magnetic disk 5 rises to a predetermined high speed, as shown in FIG. 6C, the pressure generated by the air flow in the direction of arrow a in FIG. 1 generated on the surface of the magnetic disk 5 causes The flying head 11 is the magnetic disk 5
Is flying in the arrow f 'direction in the landing zone 5b from the surface of the magnetic disk 5 to a height H ₂ of about 0.1~0.2μm against the suspension 10.

Then, as shown by the alternate long and short dash line in FIG. 5, the suspension head 10 floats in the direction of the arrow f ', so that the suspension 10 is separated from the lift arm 15a in the direction of the arrow f'.

On the other hand, the air flow generated on the surface of the magnetic disk 5 at high speed collides with the wind pressure lever 21 in the direction of arrow a in FIG. 1, and the wind pressure causes the wind pressure lever 21 to move as shown in FIG. It is rotationally driven in the direction of arrow e against the tension coil spring 22, the latch arm 21a of the latch mechanism 23 is engaged with the slider 17, and the slider 17 is latched at the forward movement position in the direction of arrow d.

Therefore, as shown by the solid line in FIG. 4, the lift arm 15a is locked as it is in the lowered position in the direction of arrow c. The shape memory alloy spring 18 is de-energized several seconds after the latch arm 21a is latched by the slider 17.

After that, the head arm 9 is rotatably driven by the voice coil motor 7, and the flying head 1
1 is pulled out from the landing zone 5b of the magnetic disk 5 to the data recording zone 5a in the arrow b'direction, and the flying head 11 is sought in the data recording zone 5a by the compression coil spring 19 in the directions of the arrows b and b '. 5 is recorded and reproduced. In addition, this record,
During reproduction, as shown in FIG. 6C, the flying head 11 keeps a state of being floated to a height H ₂ with respect to the surface of the magnetic disk 5.

Next, when the power is cut off (power off), the head arm 9 is moved to the arrow b in FIG. 1 by utilizing the counter electromotive force generated by the voice coil motor 7 after the power supply to the voice coil motor 7 is cut off. And is driven to rotate in the direction, and the flying head 11 is moved to the landing zone 5b of the magnetic disk 5.
Move back in the direction of arrow b to the upper position of.

On the other hand, a back electromotive force generated by the spindle motor 3 after the spindle motor 3 is cut off is supplied to the shape memory alloy spring 18, and the shape memory alloy spring 18 causes the slider 17 to move in the direction of arrow d in FIG. When the power is turned off, the crank arm 15 is prohibited from being returned in the direction of arrow c'in FIG.

On the other hand, when the magnetic disk 5 is stopped by turning off the power supply to the spindle motor 3, the levitation force of the levitation head 11 due to the air flow disappears. Therefore, as shown in FIG. The landing zone 5b of the disk 5 is landed in the direction of arrow f, and a so-called contact stop state is established.

At the same time, when the magnetic disk 5 is stopped, the wind pressure acting on the wind pressure lever 21 in the direction of the arrow a disappears. Therefore, as shown in FIG. The latch arm 21a of the latch mechanism 23 is released from the slider 17 in the arrow e'direction by returning to the e'direction.

Then, as shown in FIG. 2, when the temperature of the shape memory alloy spring 18 is lowered to about 40 ° C. or lower, the stress of the shape memory alloy spring 18 is overcome by the stress of the compression coil spring 19, and the compression coil spring 19 causes the stress. The slider 17 and the drive shaft 16 are integrally returned in the direction of arrow d ',
As shown by the one-dot chain line in FIG. 4, the crank arm 15 is rotationally driven in the direction of the arrow c ′ to the raised position, and as shown by the solid line in FIG.
The suspension 10 is pushed up again in the direction of arrow f '.

Therefore, as shown in FIG. 6D, the flying head 11 has the landing zone 5b of the magnetic disk 5.
At almost the same time as landing in the direction of arrow f, the vehicle is lifted (lifted up) from the landing zone 5b in the direction of arrow f ', and returns to the initial stop state, as shown in FIG. 6 (A).

According to the magnetic disk device 1 constructed and operated as described above, the flying head 11 is contacted at the landing zone 5b of the magnetic disk 5.
Since it is a CSS method that starts and stops, CS
Like the S-free method, the flying head 11
The flying head 11 does not accidentally collide with the magnetic disk 5 due to a change in posture, vibration, etc., and both are not damaged at all.

Moreover, at the time of stop, the flying head 11 can be lifted up from the magnetic disk 5 by the lift-up mechanism 13, so that the flying head 11 is attracted to the landing zone 5b of the magnetic disk 5 and the magnetic disk 5 is attracted. There is no inconvenience that 5 cannot be activated.

The embodiment of the present invention has been described above.
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention.

[0039]

The disk device of the present invention constructed as described above has the following effects.

In the CSS type disk device, a lift-up mechanism for raising the flying head from the disk by cutting off the energization and lowering the flying head onto the disk by energization is provided, and at the time of stop, the flying head is lifted from the stopped disk. Since the flying head is lifted from the disk by using the pressure of the airflow generated by the rotation of the disk at the time of start, the flying head moves to the disk like the conventional CSS method. There is no inconvenience that the flying head sticks to the disk when it remains landed. Moreover, unlike the conventional CSS-free system, the flying head does not accidentally collide with the disk due to a change in the posture of the flying head or vibration at the start, and both are not damaged at all.

Unlike the CSS-free method, the flying head can be vertically moved statically at the time of start / stop. Therefore, the attitude difference of the flying head is inspected at the time of manufacture, and the flying head which is likely to collide with the disk at the time of start / stop is checked. Sorting becomes possible, and reliability can be guaranteed at the time of manufacturing.

The interface between the flying head and the disk needs only to be CSS compatible, and is easy to manufacture.

The flying head can land on the innermost circumference of the disk, and the data recording area of the disk can be effectively used.

If the floating head is lowered by the shape memory alloy spring operated by energization, there will be no problem of corrosion due to outgas, and the floating head can be lifted up after the disk is stopped. . In addition, the flying head can be landed on the disk before the disk starts to rotate, which facilitates control.

If a latch mechanism for holding the flying head in a lowered state is provided, contact start / stop operations can be stably performed.

By providing a means for operating the latch mechanism by utilizing the wind pressure generated by the rotation of the disk, it is possible to save power and simplify the structure.

[Brief description of drawings]

FIG. 1 is a plan view of an entire magnetic disk device that is an embodiment of the present invention.

FIG. 2 is a plan view showing a lift-up state of a lift-up mechanism.

FIG. 3 is a plan view showing a lift-down state of a lift-up mechanism.

FIG. 4 is a side view illustrating lift-up / lift-down of a lift-up mechanism.

FIG. 5 is an enlarged sectional view showing a lift arm portion of a lift-up mechanism.

FIG. 6 is a cross-sectional view illustrating a contact stop operation of the flying head.

[Explanation of symbols]

 1 magnetic disk device 5 magnetic disk (disk) 5a magnetic disk data recording zone 5b magnetic disk landing zone 9 head arm 10 suspension 11 flying head 13 lift-up mechanism 15a lift arm 17 slider 18 shape memory alloy spring 19 compression coil spring Dynamic urging means) 21 Wind pressure lever (latch mechanism operating means) 21a Latch arm 23 Latch mechanism

Claims (4)

[Claims] 1. A structure in which a floating head is attached to the tip of a head arm via a suspension, the floating head is floated from the disk by rotation of the disk, and the floating head is landed on the disk when the disk is stopped. In the CSS type disk device, the disk device is provided with a lift-up mechanism that lifts the flying head from the disk when power is cut off, and lowers the flying head onto the disk when power is supplied. 2. The disk device according to claim 1, wherein the lift-up mechanism lowers the flying head by means of a shape memory alloy spring which is activated by energization. 3. The disk device according to claim 1, wherein the lift-up mechanism includes a latch mechanism for holding the flying head in a lowered state. 4. The disk device according to claim 3, wherein the lift-up mechanism comprises means for operating the latch mechanism by utilizing wind pressure generated by rotation of the disk.