JPH01320688A - Magnetic head supporting body - Google Patents

Abstract

PURPOSE:To prevent the contact sliding or attraction between a slider and a disk by providing a piezo-element and a cushioning material, which arrive at the central part of a suspension spring, through an insulating material on the negative pressure slider existing side of a suspension spring rear edge part. CONSTITUTION:After a spindle starts rotation and the disk arrives at a stationary speed, when a voltage is impressed on a piezo-element 5, the tip of the piezo-element 5 generates displacement in a direction separate from a suspension spring 3, and when the already bent spring 3 approaches to a flat condition, a negative pressure slider 1 coupled through a gimbal spring 2 with the tip approaches the surface of a disk 7. The interval between the surface of the disk 7 and the sliding surface of the negative pressure slider 1 amounts to several tens microns, a self-loading operation is generated in the negative slider 1, and the negative slider 1 is smoothly loaded on the disk 7. Further, when the piezo-element 5 is bent, the cushioning material 6 is completely separated from the spring 3, and the piezo-element 5 does not affect the spring 3 at all.

Description

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

[Conventional technology]

As a magnetic head in a magnetic disk drive, a floating RAD slider in which the magnetic head is mounted on one end surface of a support is used. The floating RAD slider levitates above the disk using high-speed airflow generated by the high-speed rotation of the disk, and performs recording and playback while maintaining a small gap between the magnetic head and the recording medium. A gimbal spring is used to maintain a constant spacing while allowing free movement in each of the pitch, roll, and parallel directions, and at the same time controls the floating amount of the floating head slider. A suspension spring is added to the gimbal spring to support the magnetic head in order to move it onto the recording track.

FIG. 5 is a diagram showing an example of a conventional magnetic head support and its usage mode. In the figure, 8 is a positive pressure floating RAD slider, 2 is a gimbal spring, 3 is a suspension spring, and 7
is a disk. The positive pressure type floating RAD slider 8 is supported by the gimbal spring 2 and the suspension spring 3, and at the same time has a structure in which a load is applied by the leaf spring effect at the root of the suspension spring 3 in order to achieve an appropriate amount of levitation. When the disk 7 stops rotating, the RAD slider 8 is in contact with the surface of the disk 7, and when the disk 7 starts rotating and the rotational speed increases, the RAD slider 8 changes to the positive pressure type floating due to the hydrodynamic effect. levitate above.

In current magnetic disk drives, as a start/stop method, when the rotation of the disk stops, a floating rad slider and the disk are installed in contact with each other to start the rotation of the disk.
The so-called contact start-stop (CSS) method is used, in which the RAD slider floats as the rotational speed increases and normal operation is performed, and when the disk rotation speed decreases when the disk stops, the RAD slider floats again and lands on the disk. There is.

In this method, the floating RAD slider and the disk surface are in contact,
It goes through the following stages: low-speed sliding, separation, low-speed sliding, and contact.

[Problems solved by the invention]

The C8S method has the advantage of a simple mechanism configuration, but
It has the following problems. That is, the first is C8S
This is a problem of contact and sliding that sometimes occurs unavoidably. When the rotation speed of the disk reaches a certain speed or higher, sufficient buoyancy force is generated on the floating Radoslider, so the floating Radoslider and the disk are kept out of contact, but immediately after the disk starts rotating, the floating Radoslider The buoyancy force acting is small;
As a result, a state occurs in which the RAD slider and the disk slide while being in contact with each other due to the floating state. Such contact sliding also occurs when the disk is stopped, and in this case, the floating Radoslider transitions from a fluid lubrication state to a contact sliding state.

Floating RAD sliders are usually made of extremely hard materials such as ceramics. On the other hand, disks have a protective film on the surface to protect the magnetic recording layer and a lubricating film with good sliding properties to reduce the frictional force during C8S, but the hardness of the disk is lower than that of a floating RadSlider. . Therefore, there is a problem of frictional wear during contact sliding, and the fine frictional abrasion powder generated at this time may impede the movement of the Radoslider from stable floating, possibly resulting in a head crash.

The second problem is that the finishing precision of the slider lubricating surface of the RAD slider is required to be extremely smooth, and at the same time, the disk surface is also a high flat surface that does not interfere with the low flying height of the slider. Due to this requirement, there is a risk that the rad slider and the disk may stick to each other when the disk is stopped. - Once adhesion occurs, the frictional force increases rapidly, making it difficult to start the disk.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head support that eliminates the above-mentioned conventional drawbacks and solves problems such as contact sliding and adhesion when starting and stopping a disk.

[Means to solve the problem]

The magnetic head support of the present invention includes a negative pressure slider, a gimbal spring that supports the slider, and a suspension spring. A thin plate-shaped insulating material is provided on the side of the suspension spring where the negative pressure slider is present,
Furthermore, a piezo element is installed on the insulating material in a state substantially parallel to the suspension spring so that one end thereof is connected to the insulating material and the other end reaches approximately the center of the suspension spring, and the other end of the piezo element is connected to the insulating material. By adding a buffer material that is slightly thicker than the material,
The suspension spring is set so as to be slightly bent from a flat state toward the back side of the lubricated surface of the negative pressure slider.

[Effect]

According to the magnetic head support of the present invention, in the magnetic head support consisting of a negative pressure slider, a gimbal spring that supports it, and a suspension spring, the connection between the suspension spring and the head arm or head carriage of a magnetic disk drive is provided. A thin plate-shaped insulating material is provided on the joining surface of the suspension spring on the side where the negative pressure slider is present, and further a piezo element is placed on the insulating material in a state substantially parallel to the suspension spring, one end of which is connected to the insulating material and the other end. Install it so that it reaches approximately the center of the suspension spring. By adding a buffering material having a thickness slightly larger than the thickness of the insulating material to the other end of the piezo element, the suspension spring is slightly moved from the flat state toward the rear side of the lubricated surface of the negative pressure slider. Set it to flex.

The lubricated surface of the negative pressure slider is set away from the disk surface while the disk is stopped, and after the disk starts and reaches a steady rotational speed, voltage is applied to the piezo element and the piezo element is bent toward the disk. By removing the initially applied deflection of the suspension w7 spring and bringing the lubricated surface of the negative pressure slider closer to the rotating disk, suction force to the disk surface is gradually generated in the negative pressure slider, causing negative pressure to increase. The slider is loaded onto the disk surface. Then, when the disk is stopped, the applied voltage to the piezo element is removed, and the piezo element returns to a horizontal position, so that the suspension spring is separated from the disk surface, and as a result, the negative pressure slider is unloaded. As described above, by using the magnetic head support of the present invention, the floating head and the disk are always kept in non-contact even when the disk starts and stops, so there are problems such as abrasion of the recording medium or adhesion between the head and the disk. can be solved.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a side view showing one embodiment of a magnetic head support according to the present invention, and FIG. 2 is a front view of the same embodiment.

In Figure 1, 1 is the negative pressure slider, 2 is the gimbal,
3 is a suspension wing; 4 is an insulating material; 5 is a piezo element; and 6 is a buffer material.

The negative pressure slider 1 is joined to a gimbal spring 2 on the back side of its lubricated surface, and the gimbal spring 2 is further joined to a suspension spring 3. The insulating material 4 is bonded to the surface of the suspension spring that is bonded to the head arm or helad carriage (not shown) in the direction in which the negative pressure slider 1 exists relative to the suspension spring 3, that is, in the direction in which the disk surface exists. Ru.

On the surface of the insulating material 4 opposite to the surface that is bonded to the suspension spring 3, the piezo element 5 is bonded so as to be substantially parallel to the suspension spring 3 and to be able to bend in a direction that allows the suspension spring 3 to bend. be done. Then, at one end of the piezo element 5 opposite to the one end joined to the insulating material 4, there is a loose film slightly thicker than the insulating material 4 on the same direction as the direction in which the insulating material 4 exists with respect to the piezo element 5. The balance member 6 is joined. At this time, the buffering material 6 and the suspension spring 3 are in contact with each other and have a structure that allows them to deflect in the direction away from each other.The buffering material 6 is set to be slightly thicker than the insulating material 4, and the suspension spring Since the baby piezo element 5 has a higher hardness than the piezo element 3, the piezo element 5 has a buffer material 6.
The suspension spring 3 is not deformed by the contact force between the suspension spring 3 and the suspension spring 3, and when viewed from the piezo element 5, the suspension spring 3 is slightly bent. The amount of deflection can be controlled by the difference in thickness between the insulating material 4 and the buffering material 6.

Since the buffer member 6 and the suspension spring 3 are not coupled, if the piezo element 5 is bent in a direction away from the suspension spring 3 using a voltage supply means (not shown),
Suspension spring 1 and spring 3 try to return to a flat position, and when the amount of deflection of piezo element 5 becomes larger than the initial amount of deflection of suspension spring 3, suspension spring 3 and shock absorber 6 separate. do. Therefore, when the shock absorber 6 and the suspension spring 3 are separated, the suspension spring 3 and the gimbal spring 2 coupled thereto, and needless to say, the negative pressure slider IK, are not affected by the piezo element 5 and the buffer material 6, and Since the suspension spring 3 is fixed to the head arm or the like at its root, the influence from the root can be almost ignored.

3 and 4 are side views for explaining the operation of the embodiment of the present invention, and 7 shows a cross section of the disk. FIG. 3 shows the setting state of the embodiment of the magnetic head support of the present invention when the apparatus is stopped, that is, when the disk is not rotating. In this state, the lubricating surface of the negative pressure slider 1 and the surface of the disk 7 are approximately 0.2
It is set with a slight gap of about 100 mm.

After the spindle starts rotating and the disk reaches a steady speed, a driving voltage is applied to the piezo element 5 from a voltage supply device (not shown). When a voltage is applied to the piezo element 5, the tip of the piezo element 5 is displaced in a direction away from the suspension spring 3, and as a result, the suspension spring 3, which has been bent and bent, attempts to restore its flat state. When the suspension spring 3 approaches a flat state, the negative pressure slider 1 connected to its tip via the gimbal spring 2 approaches the surface of the disk 70. When the surface of the disk 7 and the lubricated surface of the negative pressure slider 1 reach approximately several tens of microns, a self-loading effect occurs in the negative pressure slider 1, and the negative pressure slider 1 is smoothly loaded onto the disk 7. If the piezo element 5 is further bent, the buffer material 6 and the suspension spring 3 are completely separated as in the fourth case, and the piezo element 5 has no effect on the suspension spring 3.

Therefore, normal operation is performed in this state.0 When the device is stopped, the voltage of the piezo element 5 is gradually removed from the state shown in Fig. 4, and at the same time, the rotation speed of the disk 70 is decreased, and when a certain speed is reached, the piezo element 5 is turned off. The negative pressure slider 1 is unloaded without contacting the surface of the disk 70 by lifting the suspension spring 3 in a direction away from the disk 7 using the force of the slider 5 trying to return to a flat state.

By realizing the above-mentioned operation using the magnetic head support shown in the embodiment of the present invention, the floating RAD slider and the surface of the disk are always kept in non-contact, and as a result, problems such as C8S and adsorption can be avoided. can be solved. As for the materials for the insulating material and the buffering material, it is sufficient to select appropriate materials that do not affect the operation of the piezo element, and it goes without saying that the shape and material of the piezo element may also be appropriately designed.

〔Effect of the invention〕

As explained above, the magnetic head support of the present invention is set so that the negative pressure slider and the disk are not in contact when the disk is stopped, and after the rotation speed of the disk reaches the rated rotation speed. By loading the negative pressure slider onto the disk and unloading it just before the disk stops, it is possible to keep the disk and magnetic head out of contact at all times, which eliminates problems such as contact sliding or adhesion between the slider and disk. can be avoided.

[Brief explanation of the drawing]

1 and 2 are a side view and a front view showing an embodiment of the present invention, respectively, FIG. 3 is a side view showing the embodiment in a state when the disk is stopped, and FIG. 4 is an operation of the embodiment. FIG. 5 is a side view showing a conventional magnetic head support. 1... Negative pressure slider, 2... Gimbal spring, 3... Suspension spring, 4...
...Insulating material, 5...Piezo element, 6...
-Buffering material, 7... Disk, 8... Floating RAD slider. Agent Patent Attorney Shinken Uchihara 4 Kasumi 5 Figure

Claims (1)

[Scope of Claims] A magnetic head support including a negative pressure slider, a gimbal spring that supports the negative pressure slider, and a suspension spring that supports the gimbal spring at its tip, comprising: A thin plate-shaped insulating material provided on the side where the negative pressure slider is present, and installed so that one end is connected to the insulating material and the other end reaches approximately the center of the suspension spring so as to be substantially parallel to the suspension spring. The piezo element is provided at the tip of the piezo element on the side where the suspension spring is present, and is slightly thicker than the insulating material, and when the piezo element is not driven, it comes into contact with the suspension spring and protects it from the suspension spring. 1. A magnetic head support comprising: a buffer material which is deflected to the opposite side of the negative pressure slider and separated from the suspension spring by driving the piezo element.