JPH09282823A - Suspension for magnetic disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a head slider to jump on the disk surface by arranging a load arm having a projection on the surface in the opposite side of the head slider mounting surface and a gimbal for mounting the head slider. SOLUTION: A suspension loading a head slider receives an impact load to be deviated in the direction to become far from a disk and a head slider 20 receives a force in the direction as isolated from the disk surface. In this case, a projection formed on the load arm 20 of suspension is placed in contact with the suspension and thereby further displacement of the load arm 20 can be controlled and the head slider will never be floated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device used for recording information, and more particularly to a suspension for a magnetic disk device having excellent impact resistance.

[0002]

2. Description of the Related Art A magnetic disk device is a precision machine component, and if it receives an impact by being dropped or the like, the head disk interface or bearings of various parts may be damaged and may not operate normally. For example, the impact causes the head slider to jump off the disk surface, and then collide with the disk. The head slider is generally made of ceramics and is hard and brittle. Therefore, a part of the head slider may be damaged or the mounted magnetic head may be damaged due to the collision with the disk. To prevent this, as described in Patent Application No. PCT WO 89/08313, there is a method of retracting the head slider to the outside of the disk surface when the magnetic disk device is stopped.

0-7803-2605-9 / 95 / $ 4.00 1995 IEEE
As described in HC-07, there is a method of providing a head slider jump-up prevention mechanism on the side surface of the spindle.
According to this method, jumping of the head slider can be prevented by positioning the head slider near the spindle when information is not being read or written.

[0004]

[Problems to be Solved by the Invention] Patent application number PCT WO 8
The method described in 9/08313 cannot prevent the head slider from jumping up because the head slider is on the disk surface when the magnetic disk device is operating.

0-7803-2605-9 / 95 / $ 4.00 1995 IEEE
The method described in HC-07 cannot prevent jumping of the head slider because the head slider is far from the spindle while information is being read or written. An object of the present invention is to provide a magnetic disk device used for recording information, and particularly to provide a suspension for obtaining a magnetic disk device having excellent impact resistance without being restricted by the position of the head slider on the disk.

[0006]

According to the present invention, as a suspension of a magnetic disk device, a load arm having at least one protrusion provided on a surface opposite to a head slider mounting surface, and a gimbal for mounting the head slider. It uses a suspension consisting of.

When the magnetic disk drive receives an impact from below, the disk and suspension flex. At this time, the suspension mounted with the head slider mounted upward bends in the direction away from the disk under the impact load, and the head slider receives a force in the direction away from the disk surface. Further thereafter, due to the elastic repulsion of the disk and / or the elastic repulsion of the suspension, the suspension mounted with the head slider mounted downward jumps upward, and the head slider receives a force in a jumping direction from the disk surface. At this time, since the protrusion provided on the load arm of the suspension comes into contact with the adjacent suspension, further displacement of the load arm is suppressed.
The head slider does not jump up, or the jumping distance can be made extremely small. In addition, even if it jumps up, the protrusions are plastically deformed,
Vibration energy of the suspension can be absorbed. Furthermore, by using a shape memory alloy as the material of the protrusions, the shape of the protrusions can be returned to the original state without contact by increasing the ambient temperature of the protrusions.

[0008]

1 is a perspective view of a suspension for a magnetic disk device according to the present invention. 1 is a protrusion, 4
Is a gimbal and 5 is a load arm.

FIG. 2 is a perspective view of a part of a suspension for a magnetic disk drive according to the present invention and an arm for mounting it. 6 is a head slider, 7 is a guide arm, and 8 is a mount. According to this embodiment, the protrusion 1
Is provided directly above the head slider 6, and can effectively prevent the head slider from jumping up due to the primary bending of the suspension including the gimbal 4 and the load arm 5.

FIG. 3 is a cross-sectional view of a suspension for a magnetic disk device according to the present invention, a part of an arm for mounting the suspension, and a part of the disk. Reference numeral 1a is a shape memory alloy protrusion. Two sets of two suspensions are arranged between the three disks. In this embodiment, the shape memory alloy protrusion 1a is disposed on one of the suspensions. The shape memory alloy protrusion 1a keeps the displacement amount of the tip end portion of the set of suspensions on which the head slider 6 is mounted to be equal to or less than the maximum displacement of the gimbal 4, so that the head slider jumps up from the disk even when an impact is applied. Can be prevented. When a larger impact is applied, the shape memory alloy protrusions 1a are plastically deformed to absorb the impact, and the displacement of the suspension can be effectively damped.

FIG. 4 is a cross-sectional view for explaining the positional relationship of the magnetic disk drive suspension according to the present invention and a part of the arm for mounting the same and a part of the disk in a state where no shock is applied. 4a and 4b are gimbals, and 5a and 5b are load arms.

The head sliders 6a and 6b and the load arms 5a and 5b maintain a distance Ld via the gimbals 4a and 4b, respectively. Also, the shape memory alloy protrusion 1
The distance between the tip of a and the load arm 5a on which the shape memory alloy protrusion is not arranged is Lg.

FIG. 5 is a sectional view for explaining the positional relationship of the suspension for a magnetic disk device according to the present invention, a part of an arm for mounting the same, and a part of the disk when an impact is applied from below. For ease of explanation, two discs and a set of suspensions placed between them are shown. When the suspension receives an impact and the load arm 5 bends downward, the load arm 5b comes into close contact with the head slider 6b and the distance therebetween becomes zero. Furthermore, the load arm 5a comes into close contact with the shape memory alloy protrusion 1a, and the distance between them becomes zero. On the other hand, the distance between the load arm 5a and the head slider 6a increases to Lf. Lf is Lg + 2 as shown in FIG.
It is Ld. Here, the maximum displacement amount Lm of the gimbals 4a and 4b is set so that the following relationship is established between Lg and Lf.
Is set. Lm ≧ Lf = Lg + 2Ld Therefore, the distance between the head slider 6a and the load arm 5a does not exceed the maximum displacement amount Lm of the gimbal 4a.
The head slider 6a never jumps up from the disk. Similarly, since the distance between the head slider 6b and the load arm 5b does not exceed the maximum displacement amount Lm of the gimbal 4b, the head slider 6b does not jump up from the disk.

FIG. 6 is a sectional view of a magnetic disk device mounted with a suspension for a magnetic disk device according to the present invention. Reference numeral 10 is a spindle, 11 is an actuator, 12 is a base, and 13 is a cover.

A shape memory alloy protrusion 1 is arranged on a load arm 5 on the upper surface side of the disk to prevent the head slider from jumping up from the disk surface when the magnetic disk apparatus receives an impact. You can When a large impact is applied, the shape memory alloy protrusion 1a is plastically deformed to absorb the kinetic energy of the suspension and to effectively damp the vibration of the suspension. It is possible to prevent the slider and / or the disk from being damaged. As a result, the information read / write operation of the magnetic disk device is not hindered. Further, the shape memory alloy protrusion 1a has a self-repairing function of recovering the shape when the ambient temperature rises above the transformation point due to heat generation when the magnetic disk device on which the shape memory alloy is mounted is operated. As a result, it is possible to prepare for the next impact without performing opening repair or adjustment at all.

[0016]

When a shock is applied, the head disk slider can be prevented from jumping up from the disk surface, and even if it jumps up, its kinetic energy can be absorbed and the vibration of the suspension can be effectively damped. Therefore, it is possible to prevent the head slider and / or the disk from being damaged due to the collision between the head slider and the disk.

[Brief description of drawings]

FIG. 1 is a perspective view of a suspension for a magnetic disk device according to the present invention and a part of an arm for mounting the suspension.

FIG. 2 is a sectional view of a suspension for a magnetic disk device according to the present invention, a part of an arm for mounting the suspension, and a part of a disk.

FIG. 3 is a cross-sectional view of a magnetic disk device mounted with a suspension for a magnetic disk device according to the present invention.

FIG. 4 is a sectional view showing one state of a suspension unit for a magnetic disk device according to the present invention.

FIG. 5 is a cross-sectional view showing another state of the suspension unit for the magnetic disk device according to the present invention.

FIG. 6 is a sectional view of a magnetic disk device mounted with a suspension according to another embodiment of the present invention.

[Explanation of symbols]

1, 1a, 1b ... Shape memory alloy protrusions, 4 ... Gimbal, 5 ... Load arm, 6 ... Head slider, 7 ... Guide arm, 8 ... Mount, 10 ... Spindle, 11 ... Actuator, 12 ... Base, 13 ... cover.

Claims (1)

[Claims] 1. A magnetic disk drive suspension comprising: a load arm having at least one protrusion provided on a surface opposite to a head slider mounting surface; and a gimbal for mounting the head slider. Suspension for magnetic disk drive.