JPS6220125A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To obtain a high density recording even if unevenness and undulation exist on a disk surface by bringing only an end part located at the rotating direction side of a slider as a profiling surface into contact with a magnetic disk board. CONSTITUTION:The slider 7 is supported by an access arm 9 through an elastic mechanism 8, which is constructed with a gimbal mechanism 18 supporting the slider 7 with a part close to the rotating direction side end part of the slider 7 as a fulcrum. A fulcrum position P supporting the slider 7 by the gimbal mechanism 18 is set between the pressure center A of a dynamic pressure Q arising on the rail surface of the slider 7 due to the rotation of the magnetic disk board 3 and the pressure center B of the surface pressure R of the profiling surface 16. A magnetic head 6 is constructed with a yoke 20 fixed to the end surface positioned at the rotating direction side of the slider 7 with the rotating direction of the magnetic disk board 3 as a reference so that a magnetic gap G can be positioned at a place retreating by about 0.1mum from the profiling surface 16, and a coil 21 wound in the outer periphery of the yoke 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a LA disk device, and particularly to a magnetic disk device that is capable of realizing high-density recording and reproduction.

C Technical background of the invention and its problems] As is well known,! 1-ki disk devices are widely used as external storage devices for computers.

The main parts of such a magnetic disk device are generally a magnetic disk plate driven eight times by a one-turn drive source, a slider provided movably along the magnetic disk plate, and a magnetic disk fixed to the slider. It consists of a magnetic head that writes to and reads from the disk plate.

Generally, it is not preferable to bring a magnetic head into direct contact with a magnetic disk plate that is rotating at high speed. For this reason, in conventional magnetic disk drives, the slider has the function of supporting the magnetic head and the function of compressed air flowing between the slider and the disk surface when the magnetic disk plate rotates while facing the magnetic disk plate. This dynamic pressure causes the slider itself to levitate, thereby achieving the function of preventing the slider and magnetic head from coming into direct contact with the disk surface. 2. Normally, a method is adopted in which the magnetic head is positioned at a point where the lift force generated on the slider and the force exerted by a spring member or the like are balanced.

By the way, recently there has been a desire for a magnetic disk device with sufficiently high recording density to appear, and a
The use of perpendicular magnetic recording media is being considered as one means. However, when using a perpendicular magnetic recording medium, in order to maximize the characteristics of this recording medium, the distance between the magnetic head and the magnetic disk plate must be kept to 0.1 μm or less, and the fluctuations must be kept to a very small level. It is necessary to keep it to a value.

However, if the magnetic head is fixed to a slider that flies due to dynamic pressure, as in conventional magnetic disk drives, the flying height of the slider itself fluctuates greatly due to external disturbances, so the relationship between the magnetic head and the magnetic disk plate increases. It has been inherently difficult to keep the spacing between them sufficiently small and with little variation. For this reason,
It has been difficult to achieve high-density recording using perpendicular magnetic recording media.

Therefore, in order to eliminate such problems.

It is conceivable to bring the slider into direct contact with the magnetic disk plate. However, since the slider itself is connected to the access arm via a gimbal mechanism or the like, it is not possible to make the entire slider so small. therefore,
When the above-described method is adopted, a relatively large block-like slider comes into direct contact with the magnetic disk plate. Therefore, there is a problem in that the amount of wear on the slider and the magnetic disk plate increases and the life of the device is shortened. Further, the surface of the @1 disk plate is not necessarily flat, but usually has irregularities and undulations. For this reason, when a large slider is brought into contact with the magnetic disk plate.

The distance between the magnetic head and the magnetic disk plate is determined by the highest protrusion present in the range in which the slider is in contact. For this reason, there is a possibility that the recording density cannot be improved that much.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and its purpose is to minimize the distance between the magnetic head and the magnetic disk plate even if the disk surface has unevenness or undulations. It is an object of the present invention to provide a magnetic disk device that can hold magnetic disks stably at all times, realize high-density recording, and extend the life of the device.

[Summary of the invention]

According to the present invention, a magnetic disk plate rotationally driven by a one-rotation drive source, a slider provided movably along the magnetic disk plate, and rotation of the slider with reference to a rotational direction of the magnetic disk plate. a forced contact means for bringing only the end located on the direction side into contact with the magnetic disk plate as a scanning surface; and a magnetic head fixed at a position close to the scanning surface of the slider for writing and reading on and from the magnetic disk plate. A magnetic disk device is provided.

〔Effect of the invention〕

In the magnetic disk drive according to the present invention, only the end of the slider located on the rotational direction side is always in contact with the magnetic disk plate as a tracing surface. and.

A magnetic head is fixed at a position close to the tracing surface. Therefore, the distance between the magnetic head fixed to the slider and the magnetic disk plate is.

It is always kept almost constant without being affected by external disturbances. The distance from the tracing surface to the magnetic head can be set to about 0.1 μm or less using current machining technology.

In addition, as long as the contact area of the tracing surface is set to be sufficiently narrow, the magnetic head can be made to completely follow the unevenness and undulations existing on the disk surface.

The above-mentioned spacing can always be maintained substantially constant. Therefore, according to the present invention, it is possible to set the distance necessary to fully utilize the features of the perpendicular magnetic recording system, that is, the distance between the magnetic head and the magnetic disk plate, to about 0.1 μm or less, and The spacing can always be maintained stably. Therefore, high-density recording can be achieved while protecting the magnetic head. Further, the portion of the surface of the slider that comes into contact with the magnetic disk plate is only the portion that serves as a tracing surface, regardless of the overall size of the slider, and it is easy to make this tracing surface sufficiently narrow. Therefore, by setting the contact area of the tracing surface to be narrow, wear of the slider and the magnetic disk plate can be suppressed, and as a result, the life of the device can be extended.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an example in which the present invention is applied to a magnetic disk drive having an access arm for each magnetic disk plate.

In other words, 1 in Figure 9 is a disk stack.

This disk stack 1 has, for example, 6 disks on the outer periphery of the shaft 2.
It is constructed by fixing two magnetic disk plates 3 coaxially and at regular intervals. The shaft 2 is connected to a rotary drive source 4, which is controlled by a control device 5. A recording medium layer made of a perpendicular magnetic recording medium is formed on the upper and lower surfaces of each disk plate 3 in the figure. One disk surface of the outermost disk plate is used for positioning, and the other disk surface and other magnetic disk plates are used for data. Furthermore, a lubricating oil film is provided on both surfaces of each magnetic disk plate 3.

Near both sides of each magnetic disk plate 3, a total of 12 magnetic heads 6 are arranged on a line parallel to the axis 2, sandwiching each disk plate, and each of these magnetic heads 6 has a slider 7 and an elastic mechanism 8. and is supported by a carriage 10 via an access arm 9. The carriage 10 is
Actuator 11 controlled by control 11 device 5
1, and is selectively controlled to move in the direction shown by arrow 12 in FIG. The rotary drive source 4 and the actuator 11 are controlled by the control device 5 using a method similar to a known method.

The magnetic head 6, slider 7, and elastic mechanism 8 have the same structure, and are specifically constructed as shown in FIG. 2. That is, the slider 7 is formed as a whole in the shape of a long square block in the direction along the rotational direction of the magnetic disk plate 3, and the slider 7 is formed in the shape of a long square block in the direction along the rotational direction of the magnetic disk plate 3, and the slider 7 has a rectangular block shape that is long in the direction along the rotational direction of the magnetic disk plate 3. An inclined surface 15 is formed at the end located on the counter-rotation direction side and gradually moves away from the disk surface as it goes in the counter-rotation direction, and a profiled surface 15 is formed at the end roughly on the rotation direction side as shown in FIG. 16 was formed.

Furthermore, a rail surface 17 for generating dynamic pressure is formed in the center. The slider 7 configured as described above is supported by the access arm 9 via two elastic mechanisms 8. The elastic mechanism 8 is.

It is comprised of a gimbal mechanism 18 that supports the slider 7 using a portion near the end of the slider 7 in the rotational direction as a fulcrum. The fulcrum position for supporting the slider 7 in the gimbal deep groove 18 is as shown at P in FIG.

It is set between the pressure center A of the dynamic pressure Q generated on the rail surface 17 of the slider 7 due to the rotation of the magnetic disk plate 3 and the pressure center B of the surface pressure R of the tracing surface 16. On the other hand, the magnetic head 6 has a magnetic gab G located on the end face located on the rotational direction side of the slider 7 with respect to the rotational direction of the magnetic disk plate 3 at a position retreated by about 0.1 μm from the tracing surface 16. It consists of a yoke 20 that is fixed so as to be fixed, and a coil 21 that is wound around the outer periphery of this yoke 20.

With such a configuration, when each magnetic disk plate 3 is rotating, each slider 7 receives a rotational force about the fulcrum position P due to the dynamic pressure Q formed on the rail surface 17.
As a result, the tracing surface 16 of each slider 7 is always in contact with the corresponding disk surface.

Therefore, the distance between the magnetic gap G of each magnetic head 6 and the disk surface of each magnetic disk plate 3 is:

The distance is determined by the attachment of the magnetic head 6 to each slider 7. Generally, it is relatively easy to set the above-mentioned interval to 0.1 μm or less by employing etching technology or the like. Therefore, the magnetic head 6 and the magnetic disk plate 3
It becomes possible to always maintain the distance between the two at about 0.1 μm or less. In this case, since the tracker 16 of each slider 7 is always brought into contact with the corresponding disk surface, it is possible to prevent the above-mentioned interval from varying due to external disturbances. In addition, it is easy to narrow the contact area of the tracing surface 16, and by making the contact area sufficiently narrow, even if there are irregularities or undulations on the disk surface, the magnetic head 6 and the magnetic disk plate can be sufficiently tracked. 3 can be kept almost constant. Therefore, the distance between the magnetic head and the magnetic disk can be maintained at a value that allows the characteristics of the perpendicular magnetic recording medium to be fully exhibited. In addition, as described above, the tracing surface 16
It is easy to make the width sufficiently narrow, and by making it narrow in this way, wear of the slider 7 and the magnetic disk plate 3 can be suppressed. therefore.

The lifespan of the device can also be improved, after all.

The above-mentioned effects can be achieved.

Note that the present invention is not limited to the embodiments described above, and can be modified in various ways. That is, in the embodiment described above, the slider 7 is rotated by the dynamic pressure applied to the rail surface 17 to apply the necessary surface pressure to the tracing surface 16, but even if the surface pressure is applied by a load spring or the like. good. Alternatively, the tracing surface and the magnetic disk may be set to be in line contact. Further, a thin film magnetic head may be used as the vA head. Other 2 Various modifications can be made without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the slider section of the device, FIG. 3 is a side view showing only the slider, and FIG. FIG. 4 is a diagram for explaining the slider support position. DESCRIPTION OF SYMBOLS 1... Disk stack, 2... Axis, 3... Magnetic disk plate, 4... Rotation drive source, 5... Control device,
6... Magnetic head, 7... Slider, 8... Elastic mechanism, 9... Access arm, 10... Carriage, 11... Actuator, 16... Copying surface, 17
...Rail surface, 18...Cymbal mechanism, 20...
Yoke, 21...coil. Applicant's agent Patent attorney Takehiko Suzue No. 10

Claims (5)

[Claims] (1) A magnetic disk plate that is rotationally driven by a rotational drive source, a slider that is movably provided along the magnetic disk plate, and a slider that is disposed on the rotational direction side of the slider with reference to the rotational direction of the magnetic disk plate. A forced contact means for bringing only the located end into contact with the magnetic disk plate as a tracing surface, and a magnetic head fixed at a position close to the tracing surface of the slider for writing to and reading from the magnetic disk plate. A magnetic disk device characterized by: (2) The magnetic disk device according to claim 1, wherein the magnetic head is fixed to the slider with a magnetic gap portion located at a position retreating from the tracing surface of the slider. . (3) The magnetic disk device according to claim 1 or 2, wherein the magnetic head is a thin film head. (4) The magnetic disk device according to claim 1, wherein the magnetic disk plate has a recording layer made of a perpendicular magnetic recording medium. (5) The magnetic disk drive according to claim 1, wherein the forced contact means is performed by setting a fulcrum position of the slider.