JP2943780B2 - Contact recording magnetic head slider - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head slider of a contact recording type for performing magnetic recording and reproduction while sliding a magnetic head slider and a magnetic disk in contact with each other, and more particularly, to a pad by the action of a negative pressure generated in the magnetic head slider. The present invention relates to a magnetic head slider having a function of bringing a contact surface of the magnetic head into parallel contact with a magnetic disk and maintaining the state of contact in parallel.

[0002]

2. Description of the Related Art For the contact between a magnetic head slider of the conventional contact recording type and a magnetic disk, for example, Japanese Patent Application Laid-Open No. 5-54578 discloses an attraction due to the surface tension of a liquid lubricant on the surface of a magnetic disk and a liquid lubricant. A technique is disclosed in which a magnetic head slider and a magnetic disk are brought into contact with each other by balancing the repulsion caused by the pressure.

FIG. 2 is a schematic diagram showing an example of contact between a magnetic head slider of a contact recording type and a magnetic disk. A magnetic head slider 32 having a magnetic head 31 is supported by a magnetic head slider holding mechanism 35 with a pressing force or a pulling force L and comes into contact with a liquid lubricant layer 33 on the outermost surface of the magnetic disk. Are formed. Generally, a surface tension acting on an interface between a liquid and a solid is called a meniscus force, and a meniscus 34 of a liquid lubricant is formed by the meniscus force. Then, the attractive force F1 by the meniscus 34 and the repulsive force F2 due to the pressure of the liquid lubricant 33 compressed by the magnetic head slider 32 act on the magnetic head slider 32,
The magnetic head slider 32 maintains contact with the magnetic disk at a position where the attractive force F1 and the repulsive force F2 are balanced.

In the contact method that does not use a meniscus force, the attitude of the magnetic head slider, such as the pitch and roll, is controlled by reducing the assembly dimensional tolerance of the magnetic disk device, as in the case of a general floating magnetic head slider. The magnetic head slider brings the pad and the magnetic disk into parallel contact with each other by the pressing force of the magnetic head holding mechanism.

[0005]

However, according to the contact recording method of the magnetic head slider and the magnetic disk of the above-described example, the liquid lubricant needs an appropriate thickness to generate a meniscus force. Since the disk is rotating at high speed, the spin-off of the liquid lubricant occurs and the thickness of the liquid lubricant becomes thin, so that a sufficient meniscus force cannot be generated, and the contact between the magnetic head slider and the magnetic disk can be maintained for a short time. In order to maintain the thickness of the liquid lubricant, a liquid lubricant supply mechanism is required.However, the space for the supply mechanism must be provided inside the magnetic disk drive by reducing the size of the magnetic disk drive. However, there are problems that the number of parts is increased due to the difficulty in adding the supply mechanism.

When the meniscus force is not used, the pad and the magnetic disk are contacted in parallel, and in order to maintain the contact state and obtain good electromagnetic conversion characteristics, the assembly dimensional tolerance of the magnetic disk device is reduced, and the magnetic head is reduced. There is a problem that the attitude of the slider, such as pitch and roll, must be controlled.

An object of the present invention is to use a meniscus force generated between a liquid lubricant and a magnetic head slider without using a meniscus force.
It is an object of the present invention to provide a technique for keeping a contact surface of a pad of a magnetic head slider and a magnetic disk in parallel by a simple method and maintaining the contact.

Another object is to contribute to downsizing of a magnetic disk drive and downsizing of members.

[0009]

A magnetic head slider according to the present invention is a contact recording type magnetic head slider, and is provided on a head slider surface facing a magnetic disk and on the head slider surface. And a magnetic head mounted on the pad, and a step is provided on the head slider surface by providing a recess in a direction away from the magnetic disk.

In the magnetic head slider according to the present invention, the pads are arranged near both ends near the air inflow end of the head slider surface and near a step near the air outflow end of the head slider surface. It is characterized by having been done.

The magnetic head slider according to the present invention is characterized in that the step extends substantially in the radial direction of the disk.

The magnetic head slider according to the present invention is characterized in that the step has a wedge shape facing the air outflow side.

In the magnetic head slider according to the present invention, the step is provided near a base of the pad, and the pad has a side defined by the step or an end of the head slider surface of the head slider surface. It is characterized by being installed on a triangle.

The magnetic head slider according to the present invention is characterized in that one side of the triangle is on the air inflow side and one corner is on the air outflow side.

The electromagnetic conversion characteristics do not depend on the assembly dimensional tolerance. Therefore, the assembly dimensional tolerance can be widened.

No need for the meniscus force of the liquid lubricant,
Since the phenomenon that the lubricant inside the disk surface becomes thinner due to the spin-off of the liquid lubricant can be prevented, the life of the magnetic disk device can be extended. Further, since a liquid lubricant supply mechanism is not required, it is possible to cope with downsizing of the magnetic disk drive.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a perspective view showing a contact recording type magnetic head slider according to the present invention. At least one pad 2 that contacts a magnetic disk (not shown) is provided on the side of the magnetic head slider 1 facing the magnetic disk (not shown), and a magnetic head 6 is mounted on the pad 2. A step 3 is provided on a slider surface 7 of the magnetic head slider 1 on which the pads 2 are provided. The operation will be described in detail with reference to FIG. 3 showing a state in which the magnetic head slider is in contact with the magnetic disk. When the magnetic disk 4 is not rotating, the magnetic head slider 1 is moved by the suspension 5 to the magnetic disk 4.
Pressed against. When the magnetic disk 4 rotates, the air flow A flows between the magnetic head slider 1 and the magnetic disk 4. The air flow A flowing from the tip of the magnetic head slider 1 is compressed between the magnetic head slider and the magnetic disk. When air flows to the step 3 located at the rear of the pad 2, the pressure between the magnetic head slider 1 and the magnetic disk 4 is increased because the distance between the magnetic head slider 1 and the magnetic disk 4 is increased. Occurs. Since the negative pressure B generated by the magnetic head slider 1 acts in the direction of the magnetic disk 4 in addition to the load applied from the suspension 5 to the magnetic head slider 1, the pad 2 can be kept in contact with the magnetic disk 4. Further, even if the magnetic head slider is inclined with respect to the magnetic disk 4 due to an assembly error of the magnetic disk device, and the pad 2 is in contact with the magnetic disk 4 while being inclined or slightly floats, the magnetic disk 4 rotates. When the negative pressure B is generated on the step 3, the magnetic head slider 1 is pressed against the magnetic disk 4 and the contact surface of the pad 2 comes into contact with the magnetic disk 4 in parallel. Demonstrates conversion characteristics.

FIG. 4 shows the measurement results of the head output for the magnetic head slider 1 of the present invention. Due to the shapes and positions of the three pads 2, it is difficult to make the slider surface 7 of the magnetic head slider 1 facing the magnetic disk completely parallel to the magnetic disk surface. Roll angle with respect to. In the magnetic head slider 1 of the present invention, even when the roll angle with respect to the magnetic disk is ± 2 degrees, the amount of change in the output when the roll angle is 0 degree is small. On the other hand, in the conventional magnetic head slider having no step, when a roll angle of ± 1 degree occurs as shown in FIG. 4, the output becomes close to zero. The range of the roll angle at which the head output is output (the range where the output is 0 or more in FIG. 4) is more than twice as large in the case of the magnetic head slider having the step as compared with the conventional magnetic head slider having no step. In other words, this means that the allowable value of the assembly dimensional error has more than doubled. At the same time, as a result of measuring the fluctuation of the read / write signal output of the magnetic head, it is found that the magnetic head slider cannot follow the undulation or minute roughness of the magnetic disk with the magnetic head slider having no step, and the magnetic head jumps. Although the output fluctuation was about 15%, the magnetic head slider 1 with the step can reduce the output fluctuation to 5% and maintain the attitude of bringing the pads into contact with the magnetic disk in parallel. I understood.

Next, as a second embodiment of the present invention, FIG.
1 shows an example of a magnetic head slider 1 in a perspective view similar to FIG.

On the slider surface 7 of the magnetic head slider 1 facing the magnetic disk (not shown), there are provided pads 2 which are in contact with the magnetic disk (not shown). The slider surface on which the pads 2 of the magnetic head slider 1 are provided Is provided with a step 3. The difference from the first embodiment is that the step surface 3 has a wedge shape, so that even if air flows into the magnetic head slider 1 from an oblique direction, the step 3 can be received in a positional relationship close to the front and is negative. Pressure can be generated stably, and the magnetic head slider 1 is pressed against a magnetic disk (not shown) to bring the pad 2 into parallel contact with the disk, so that the magnetic head 6 exhibits good electromagnetic conversion characteristics.

Next, FIG. 6 shows a third embodiment of the present invention.
1 shows an example of the magnetic head slider 1 in a perspective view similar to FIGS.

On the side of the magnetic head slider 1 facing the magnetic disk (not shown), there is provided a pad 2 which is in contact with the magnetic disk (not shown), indicating that a step 3 is provided near the base of the pad 2. ing. The difference from the first embodiment and the second embodiment is that the step 3 is provided near the base of the pad 2. This configuration is adopted because a portion near the pad 2 easily generates a negative pressure due to a step. A negative pressure is generated near the pad 2 to bring the pad 2 into parallel contact with a magnetic disk (not shown), so that the magnetic head 6 exhibits good electromagnetic conversion characteristics.

[0024]

The first effect of the present invention relates to a magnetic head slider of the contact recording type, and can widen an allowable assembly tolerance. The reason is that the magnetic head slider generates a negative pressure and presses the pad against the magnetic disk.

The second effect is that the pad of the magnetic head slider can maintain a parallel contact state with the magnetic disk without using the meniscus force of the liquid lubricant during the operation of the magnetic disk device. The reason is that the magnetic head slider generates a negative pressure and presses the pad against the magnetic disk.

The third effect is that the life of the magnetic disk drive can be extended by the contact recording type magnetic head slider utilizing the meniscus force of the liquid lubricant. The reason is that the negative pressure is used so that the contact can be maintained as long as the magnetic disk is rotating at a steady rate. This is because the magnetic head cannot be generated, and the magnetic head floats away from the magnetic disk, so that the magnetic head of the contact recording type cannot obtain good electromagnetic conversion characteristics.

A fourth effect is that the magnetic head slider can be kept in contact even if the magnetic disk drive is downsized. The reason is that the magnetic head slider has a function of appropriately contacting the pad of the magnetic head slider with the magnetic disk depending on the shape, so that a liquid lubricant supply mechanism that uses a small space inside the magnetic disk device is required. Because it does not.

[Brief description of the drawings]

FIG. 1 is a perspective view of a contact recording type magnetic head slider according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a main part of a conventional technique.

FIG. 3 is a side view of the magnetic head slider and the magnetic disk of FIG. 1;

FIG. 4 is an explanatory diagram showing the effect of the contact recording type magnetic head slider of the present invention.

FIG. 5 is a perspective view showing a contact recording type magnetic head slider according to a second embodiment of the present invention.

FIG. 6 is a perspective view showing a contact recording type magnetic head slider according to a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 magnetic head slider 2 pad 3 step 4 magnetic disk 5 suspension 6 magnetic head 7 slider surface A air flow B negative pressure 31 magnetic head 32 magnetic head slider 33 liquid lubricant layer 34 meniscus 35 magnetic head slider holding mechanism L pressing force or pulling up Force F1 Attraction F2 Repulsion

Claims (2)

(57) [Claims] 1. A magnetic head slider of a contact recording type, comprising: a head slider surface facing a magnetic disk; a pad provided on the head slider surface and in contact with the magnetic disk; and a pad provided on the pad. A step formed by providing a recess in a direction away from the magnetic disk on the head slider surface , wherein the step has a wedge shape facing the air outflow side.
Characteristic magnetic head slider. 2. The head slider according to claim 1, wherein said pad has a space on said head slider surface.
Near both ends near the air inlet end and the head slide
It is located near the step near the end on the air outflow side of the
2. The magnetic head slider according to claim 1, wherein: