JPH01320687A - Magnetic head supporting body - Google Patents

Abstract

PURPOSE:To prevent the contact sliding and adsorption of a slider and a disk by providing a piezoelectric element, a wadding material and a holding spring to arrive through an insulating material at the central part of a suspension spring at the negative pressure slider existing side of a suspension spring rear edge part. CONSTITUTION:When a voltage is impressed to a piezoelectric element 5 after a spindle starts the rotation and a disk arrives at a stationary speed, the dis placement occurs in the direction in which the tip is separated from a suspension spring 3, and when the spring 3 deflected beforehand approaches to the flat condition, a negative pressure slider 1 joined through a jimbal spring 2 to the tip approaches the surface of a disk 7. When the surface of the disk 7 and the lubricating surface of the negative pressure slider 1 arrive at approximately several tens of micron, a self-loading action occurs at the negative pressure slider 1 and the negative pressure slider 1 is smoothly loaded on the disk 7. Further, when the piezoelectric element 5 is deflected, a wadding material 6, a pad 10 and the spring 3 are completely away, and the piezoelectric element 5, the pad 10 and a holding spring 9 do not give any adverse influence to the suspension spring 3.

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. It is held movable in pitch, roll, and parallel directions by a gimbal spring that allows the following movement while always keeping the spacing constant. A suspension spring is attached to the gimbal spring to support the magnetic head in order to move it onto the recording track.

FIG. 6 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 Radoslider 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 floating amount. When the disk 7 stops rotating at 0, the positive pressure type floating head slider 8 comes into contact with the surface of the disk, and when the disk 7 starts rotating and the rotational speed increases, the positive pressure type floating head slider 8 moves onto the disk 7 due to the hydrodynamic effect. to levitate.

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;
Therefore, a state occurs in which the floating RAD slider and the disk slide while contacting each other. 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 RAD slider 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-like insulating material is provided on the joint surface of the suspension spring on the side where the negative pressure slider is present, and a piezo element is further connected to the insulating material at one end on the insulating material in a state substantially parallel to the suspension spring. The suspension spring is flattened by adding a cushioning material having a thickness slightly larger than the thickness of the insulating material to the other end of the piezo element. From this state, the lubricated surface of the negative pressure slider is slightly bent in the rearward direction, and the negative pressure slider is present with respect to the suspension spring at the joint surface of the suspension spring with the head arm or head carriage of the magnetic disk drive. On the opposite side, a thin plate holding spring is fixed, one end of which is fixed to the root of the suspension spring, and the other end is set to contact or face the back surface of the suspension spring with a slight gap. (Including cases where the suspension spring comes into contact with the suspension spring through a pad etc. provided at the other end).

[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 suspension spring K is connected to the Herad arm or Herad carriage of the magnetic disk device. A thin plate-like insulating material is provided on the surface of the suspension spring on the side where the negative pressure slider is present, and 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 cushioning 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 tilted from the flat state toward the rear of the lubricated surface of the negative pressure slider. Set it to a different value.

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 spring and bringing the lubricated surface of the negative pressure slider closer to the rotating disk, the negative pressure slider gradually generates a suction force toward the disk surface, so the negative pressure 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 out of contact even when the disk is started or stopped, thereby eliminating problems such as frictional wear of the recording medium or adhesion between the head and the disk. It 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 an embodiment of a magnetic head support according to the present invention, FIG. 2 is a front view of the same embodiment, and FIG. 3 is a rear view thereof. In Figures 1, 2, and 3, 1 is a negative pressure slider, 2 is a gimbal spring, 3 is a suspension spring, 4 is an insulating material, 5 is a piezo element, 6 is a buffer material, and 9 is a holding member. 10 is a pad. The negative pressure slider 1 is joined to a gimbal spring 2 on the rear surface of its lubricated surface, and the gimbal spring 2 is further joined to a suspension spring 3. Negative pressure slider 1 for suspension spring 3
The insulating material 4 is bonded to the surface of the suspension spring 3 that is bonded to the head arm or helad carriage (not shown) in the direction in which the disk surface exists, that is, the direction in which the disk surface exists.

On the surface of the insulating material 4 opposite to the surface joined to the suspension spring 3, the piezo element 5 can be deflected almost parallel to the suspension spring 3 and in a direction that allows the suspension spring 3 to deflect. is joined to. One end of the piezo element 5 that is connected to the insulating material 4 and the other end of the piezo element 5 that is connected to the insulating material 4 have a surface in the same direction as the insulating material 4 with respect to the piezo element 5. A thick cushioning material 6 is joined. At this time, the cushioning material 6 and the suspension spring 3 are in contact with each other, and the structure is such that the suspension spring 3 and the piezo element 5 can be deflected in directions away from each other.

The cushioning material 6 is slightly thicker than the insulating material 4, and the piezo element 5 has a higher hardness than the suspension spring 3.
The suspension spring 3 is not deformed by the contact force between the suspension spring 3 and the suspension spring 3, and the suspension spring 3 is slightly bent when viewed from the piezo element 5. The amount of deflection can be controlled by the difference in thickness between the solid material 4 and the cushioning material 6.

Since the buffer material 6 and the suspension spring 3 are not coupled, if the piezo element 5 is bent in the direction away from the suspension spring 3 using a voltage supply means (not shown),
The suspension spring 3 tries to return to a flat position, and when the amount of deflection of the piezo element 5 becomes larger than the initial deflection cover of the suspension spring 3, the suspension spring 3 and the buffer material 6 separate. Therefore, when the buffer material 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 1, are not affected by the piezo element 5 and the buffer material 6. 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.

Also, in the direction where the negative pressure slider 1 is not present with respect to the suspension spring 3, that is, in the opposite direction to the direction in which the disk surface is present with respect to the suspension spring 3, the surface of the suspension spring that is joined to the head arm or helad carriage (not shown) is One end of the retaining spring 9 is joined to the other end of the retaining spring 9, and a pad 10 is joined to the side of the retaining spring 9 where the suspension spring 3 is located. pad 10
The end face is in contact with the suspension spring 3 with an extremely light contact force.

4 and 5 are side views for explaining the operation of the embodiment shown in FIGS. 1 to 3, and 7 shows a cross section of the disk. FIG. 4 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 set with a small gap of approximately α2.

After the spindle starts rotating and the disk 7 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 was previously 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 7. When the lubricating surface between the surface of the disk 70 and the negative pressure slider 1 reaches 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 cushioning material 6 and the suspension spring 3 are completely separated as shown in FIG. 5, and the piezo element 5 has no effect on the suspension spring 3. Further, when the suspension spring 3 returns to its flat shape due to the displacement of the piezo element 5, the pad 10 that was in contact with one back surface of the suspension spring 3 also separates from the suspension spring 3, and the holding spring 9 and the pad 10 is a structure that does not affect the suspension spring 3 in any way. Normal operation therefore takes place in this state.

When the apparatus is stopped, the voltage of the piezo element 5 is gradually removed from the state shown in FIG. By using this to lift the suspension spring 3 in a direction away from the disk 7, the negative pressure slider 1 is unloaded without coming into contact with the surface of the disk 70.

Furthermore, when the device is stopped, the suspension spring 3 is connected to the piezo element 5 and the pad 1 via the cushioning material 6 on both sides.
The structure is supported by a retaining spring 9 via 0,
Even when some impact force is applied to the device, the vibration generated in the suspension spring 3 is minimized, and therefore the negative pressure slider 1 connected to the tip of the suspension spring 3 via the gimbal spring 2 There is little risk that the surface will come into contact with the surface of the disk 7.

If the above-mentioned operation is realized using the magnetic head support shown in the embodiment of the present invention, the floating RAD slider and the disk surface are always kept in non-contact, and as a result, C8S and adsorption can occur. be able to solve problems. Here, as for the materials of 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 should 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 prevents problems such as contact sliding or adhesion between the slider and disk. can be avoided.

[Brief explanation of the drawing]

1 to 3 are a side view, a front view, and a rear view showing one embodiment of the present invention, respectively. FIG. 4 is a side view showing the same embodiment when the disk is stopped, and FIG. 5 is the same. FIG. 6 is a side view showing the operating state of the embodiment, and FIG. 6 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...
・Buffer material, 7... Disc, 8... Floating Rad slider, 9... Holding spring, 10...
····pad. Agent Patent Attorney Susumu Uchihara 1. Zukan 3. 4. 5. 6. Trouble

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 front face of the side where the negative pressure slider is present, and one end connected to the insulating material so as to be substantially parallel to the suspension spring, and the other end reaching approximately the center of the suspension spring. and a piezo element installed at the tip of the piezo element on the side where the suspension spring is present, which is slightly thicker than the insulating material and comes into contact with the suspension spring when the piezo element is not driven. a buffer material that bends toward the rear side and moves away from the suspension spring when the piezo element is driven; 1. A magnetic head support comprising: a retaining spring that abuts the rear surface of the suspension spring at approximately the center thereof or faces the suspension spring with a slight gap therebetween.