JPS63157358A - Magnetic head supporting device - Google Patents

Abstract

PURPOSE:To decrease the vibrations of a magnetic head produced in a track direction by providing a damper having faces opposite to each other with a slight gap secured and approximately in parallel to an end face vertical to the track direction of a magnetic head slider in addition to a gimbal spring which holds the head slider. CONSTITUTION:A head slider 1 is attached to a flexible gimbal spring 2 and particularly the rigidity of the spring 2 of the track direction is reduced compared with a suspension spring 3. While a damper 4 is attached directly to the spring 3 having high rigidity in the track direction. Thus if the slider 1 produces vibrations in the truck direction, the distance between a head slider end face 5 and a damper plate 6 varies in response to the oscillation frequency of the slider 1. As a result, an air layer existing in a gap 7 between the face 5 and the plane 6 works as a squeeze film damper to suppress the vibrating amplitude and reduce the vibrating duration time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head support II used in a magnetic disk device or a flexible disk device.

[Conventional technology]

A head slider, which is a dynamic pressure type gas bearing, is used as a magnetic head in a magnetic disk device generally called a hard disk.

With the increase in the capacity and density of magnetic disk drives, the flying height of the head slider has become extremely small, and currently the flying height has reached the submicron range. The head slider travels while maintaining its floating amount stably against the run-out of the magnetic disk medium rotating at high speed and minute surface protrusions, and restrains the free movement of the head slider in order to improve the reliability of the device. It is supported by a gimbal spring, which is an extremely flexible spring. Generally, a suspension spring is connected to the gimbal spring to load the head slider with an appropriate load and to support the head slider so that the head slider runs stably at a submicron level.

Furthermore, in flexible disk drives, although the head slider differs from that of a hard disk in terms of the flying height of the head, the head slider is joined to a gimbal spring in order to improve the track followability of the magnetic nodal.

FIG. 4 is a perspective view showing an example of a conventional magnetic head support device in a hard disk drive. In the figure, 1 is a head slider, 2 is a gimbal spring, and 3 is a suspension spring. The suspension spring 3 is connected to an actuator mechanism (not shown), and the magnetic head support device is positioned at an arbitrary trunk on the surface of the magnetic disk medium at high speed. During operation of the apparatus, a pressure higher than atmospheric pressure is generated between the head slider 1 and a magnetic disk medium (not shown) due to the hydrodynamic action of air, and as a result, the head slider 1 floats above the surface of the magnetic disk medium. be able to. At that time, in order to optimally maintain the amount of levitation, an appropriate load is applied to the hent slider 1 by tension bending applied to the suspension spring 3.

FIG. 5 is a perspective view showing another example of a conventional magnetic head support device used in a flexible disk device. The mechanical configuration is almost the same as that of a hard disk device, and the head slider 1 is a very flexible spring so that it can freely move relative to the magnetic disk medium.
It is joined to the gimbal spring 2. The outer periphery of the gimbal spring 2 is fixed by a head holder 9.

[Problem that the invention seeks to solve]

In general, one of the greatest features of magnetic disk drives is their high-speed data transfer capability, which is achieved by combining a high-speed rotating magnetic disk medium and a high-speed magnetic head access mechanism. In other words, by rotating the magnetic disk medium at high speed, the rotational waiting time when reading and writing data is reduced, and by configuring a high-speed positioning system using servos, the magnetic head can be placed on the target track at high speed. It is something. High-speed rotation of magnetic disk media can be difficult, especially for large-diameter disks, due to the generation of vibrations caused by the rotational unbalance of minute weights, but technically it is possible to reduce disk runout and improve balance. It can be said that by adopting this method, even more stable and faster speeds can be achieved.

On the other hand, for a high-speed access control system, vibration of the device, especially vibration of the magnetic head support device, impedes the speeding up of the system. In other words, if you try to improve the storage capacity of the device by improving the inter-track density, as with today's large-capacity disks,
In particular, the vibration of the head portion causes oscillation of the servo system due to an increase in positional error, which significantly reduces the reliability of the fruiting device. The vibration generation mechanism in this case is mostly caused by the head being moved at high speed by an actuator such as a voice coil, and then the sudden acceleration and stop that occurs at that time.

From the perspective of the servo system, of the vibrations that occur at this time, the most problematic vibration is in the track direction, that is, in the radial direction of the magnetic disk. Not only does this increase the tolling time when the servo is on-track, resulting in a decrease in data transfer speed, but if the vibration is severe, the tracking error increases, resulting in a decrease in the margin of the servo system, causing servo oscillation. It causes This vibration in the disk track direction is different from the vibration in the flying direction of the magnetic disk head slider. Because there is an air film between the head slider and the disk medium in the flying direction, the air acts as a spring and damper, and as a result, even when vibration occurs in the head slider, the duration of the vibration amplitude is short. It also shows that the vibration amplitude is small. On the other hand, in the case of vibrations in the track direction, since there is no air film in that direction, the vibration damping and vibration amplitude are reduced only by the structural damping and viscous damping of the device. It is safe to say that we cannot actually expect much from these effects. Therefore, vibrations in the trunk direction are vibrations! ! The waiting time and vibration amplitude increase, and in some cases, it may cause servo system oscillation.
This had the disadvantage of significantly reducing the reliability of the device.

On the other hand, the capacity of flexible disk devices has also increased significantly, and the linear recording density and track density have improved. Generally speaking, flexible disk devices do not have high-grade servo systems like hard disk devices, but larger capacity flexible disk devices require a servo mechanism for track following because the distance between tracks is small. . In particular, in flexible disk drives, the magnetic disk medium is extremely flexible and replaceable, so the distortion and eccentricity of the trunk circle are currently much larger than in hard disks, and for this reason, the accuracy of the head cannot be adjusted. Track following is required. In flexible disk drives, contact and sliding often occur between the head slider and the magnetic disk recording medium, and therefore, many disturbances such as frictional force occur in the head slider. Therefore, vibrations of the head slider are unavoidable in flexible disk devices as well, and the occurrence of such vibrations causes failures in the servo system or read/write operations, which has the disadvantage of impairing the reliability of the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head support device that can eliminate the above-mentioned drawbacks and reduce the amplitude and duration of vibration of a head slider in the track direction.

[Means for solving problems]

The present invention provides a magnetic head support device having a head slider of a magnetic head and a gimbal spring that supports the head slider, in which at least one end surface of the head slider parallel to a track tangential direction of a magnetic disk medium,
It is characterized by having dampers that face each other with substantially parallel planes and are installed with a slight gap between them.

[Effect]

According to the magnetic head support device of the present invention, in addition to the head slider and the gimbal spring that supports the head slider, at least one small gap is maintained substantially parallel to the end surface perpendicular to the track direction of the magnetic head slider. By providing a damper with a surface that moves, when the head slider generates vibration in the track direction, the air film is removed using the squeeze effect that occurs when the distance between the damper and the head slider changes at high frequency. It acts as a film damper, and as a result, the amplitude of the track direction vibration of the head and the waiting time of the vibration can be significantly reduced.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of a first embodiment of the magnetic head support device of the present invention. In the figure, 1 is a head slider, 2 is a gimbal spring, 3 is a suspension spring, and 4 is a damper. The head slider 1 is connected to a gimbal spring 2, and the gimbal spring 2 is further connected to a suspension spring 3. The head slider 1 has an end surface 5 parallel to the track tangent direction of the magnetic disk medium, while the damper 4 has a flat surface 6. The damper 4 is joined to the suspension spring 3 with its flat surface 6 substantially parallel to the end surface 5 of the head slider 1 and with a slight gap 7 maintained between the flat surface 6 and the end surface 5. A gimbal spring 2 is connected to the back of the head slider 1.
In order to apply a load to the head via the gimbal spring 2, the gimbal spring on the back surface of the head is provided with a semicircular pivot.

In the case of this embodiment, the head slider 1 is joined to an extremely flexible gimbal spring 2, and in particular, it can be said that the rigidity of the gimbal spring 2 in the track direction is smaller than that of the suspension spring 3. On the other hand, the damper 4 has a structure in which it is directly connected to the highly rigid suspension spring 3 in the trunk direction.

Therefore, when vibration occurs in the head slider 1 in the track direction, the distance between the hent slider end face 5 and the damper plane 6 changes in accordance with the vibration frequency of the head slider 1, and as a result, a distance exists between the slider end face 5 and the damper plane 6. The air layer, that is, the air layer existing in the gap 7 acts as a squeeze film damper, suppressing the vibration amplitude and reducing the vibration waiting time by 1 mm.

FIG. 2 is a perspective view showing a second embodiment of the magnetic head support device of the present invention. In the figure, 1 is a head slider, 2 is a gimbal spring, 4 is a damper, and 8 is a load spring. A head slider 1 is fixed to a gimbal spring 2. A load is applied to the head slider 1 by a load spring 8. The head slider 1 has an end surface 5 parallel to the track tangent direction of the magnetic disk medium, while the damper 4 has a flat surface 6. The damper 4 is joined to the load spring 5 with its flat surface 6 substantially parallel to the end surface 5 of the head slider 1 and with a slight gap 7 maintained between the flat surface 6 and the end surface 5.

Also in this device, when the head slider 1 vibrates in the trunk direction, the end face 5 of the hent slider 1 and the damper 4
The continuation of vibration and increase in amplitude can be suppressed by the squeeze damper action formed by the plane 6.

FIG. 3 is a perspective view showing a third embodiment of the magnetic head support device of the present invention. This embodiment is a support device used for a flexible disk device.

In the figure, 1 is the head slider, 2 is the gimbal spring,
4 is a damper, and 9 is a head holder. The head slider 1 is fixed approximately at the center of the gimbal spring 2. The periphery of the gimbal spring 2 is fixed by a head holder 9. The head slider 1 has two end surfaces 5a and 5b parallel to the track tangent direction of the magnetic disk medium, while the damper 4 has flat surfaces 5a and 5b.

Then, the damper 4 connects the flat surfaces 5a and 5b to the head slider 1.
The planes 5a, 5b are approximately parallel to the end faces 5a, 5b of the
5b and the end surfaces 5a and 5b, each having a slight gap 7a.
, 7b and is joined to the head holder 9.

In the case of this device, the damper 4 and the end face 2 of the head slider 1
They are structures that face each other at the surface. On the other hand, although the gimbal spring 2 is very flexible, the head holder 9 has a relatively rigid design.

The damper 4 is joined to a highly rigid head holder 9. Therefore, even if the head slider 1 and gimbal spring 2 generate vibrations, the vibration level is small because the damper 4 is fixed to the head holder 9, which has a low vibration level.

Therefore, the gaps 7a and 7b between the navel slider 1 and the damper 4 change vibrationally when vibration occurs, and as a result, the vibration amplitude of the head slider and its duration can be reduced by the squeezing effect of the air film. .

It should be noted that this embodiment does not limit the present invention, and it goes without saying that any changes may be made without departing from the spirit of the present invention.
The shape of the damper may be optimized for each case.

〔Effect of the invention〕

According to the present invention, in addition to a head slider and a gimbal spring that supports the head slider, the magnetic head slider has at least one opposing surface substantially parallel to the end surface perpendicular to the track direction with at least one small gap therebetween. By providing a damper, when the head slider generates vibration in the track direction, the air film acts as an air film damper by using the squeeze effect caused by the distance between the damper and the heel slider changing at high frequency. This has the effect of significantly reducing the amplitude and duration of the resulting vibration in the track direction of the head.

[Brief explanation of the drawing]

1 is a perspective view showing a first embodiment of a magnetic head support device according to the present invention; FIG. 2 is a perspective view showing a second embodiment of a magnetic head support device according to the present invention; 5 is a perspective view showing a third embodiment of a magnetic head support device according to the present invention; FIG. 4 is a perspective view showing an example of a conventional magnetic head support device; FIG. 5 is a perspective view showing a conventional magnetic head support device FIG. 7 is a perspective view showing another example of the device. 1...Head slider 2...Gimbal spring 3...Suspension spring 4...
...Damper 5.5a, 5b...End face 6.5a, 6b...Flat surface 7.7a, 7b...Gap 8...Load spring 9...・
... Head holder agent Yoshiyuki Iwasa Figure 1 Figure 2 Head holder Figure 3 Figure 4

Claims (1)

[Claims] (1) In a magnetic head support device that includes a head slider of a magnetic head and a gimbal spring that supports the head slider, the head slider is substantially parallel to at least one end surface that is parallel to the track tangential direction of the magnetic disk medium. A magnetic head support device characterized by having dampers that face each other with a plane and are installed with a slight gap between them.