JPS6085476A - Floating head mechanism - Google Patents

Abstract

PURPOSE:To stabilize floating by constituting one slider of a negative pressure utilizing type slider, and the other slider is provided with two floating faces or a floating face surrounding the center of the slider and placing one slider between the floating faces. CONSTITUTION:A shape widened toward the end of an aperture such as a step is formed in a part of pressure generating face of the negative pressure utilizing type slider 11. Negative pressure is generated by said shape, and the difference in force between positive pressure and negative pressure is fed from the outside as spring load. By constituting a magnetic head 20 using such a negative pressure utilizing type slider 11, the rigidity of an air film can be made sufficiently large even if the spring load is made zero, and the value of the ridigity can be made sufficiently larger than the rigidity of a supporting mechanism 16 against pitching and rolling movement of the slider 11. Accordingly, even when the fluctuation of floating space due to swelling of running recording medium face by making the length of the slider sufficiently small, the influence of external force applied from the supporting mechanism 16 can be made sufficiently small, and the strict accuracy of assembling is not necessary even if the magnetic head 20 and supporting mechanism 16 are made small.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a floating head mechanism that flies over the surface of a traveling magnetic recording medium with a minute flying gap.

[Prior art]

Conventionally, in magnetic disk drives, in order to avoid wear and tear caused by contact between the magnetic head, which controls electromagnetic conversion, and the surface of the magnetic recording medium, a part of the slider that floats using the viscous flow of air that accompanies the surface of the rotating recording medium has conventionally been used. A floating head equipped with an electromagnetic transducer is used. This floating head is designed so that the load applied by the external load spring and the pressure generated by the slider are balanced to maintain a constant clearance.

Incidentally, one of the causes of changes in the flying clearance in a floating head is that the relative dimensions between the head support position and the recording medium surface are different from the normal setting value due to assembly errors of the disk device or the warping of the disk. The pressing force of the load spring increased or decreased. The increase in floating gap is
This deteriorates the electromagnetic conversion characteristics during recording and reproduction, and on the other hand, the reduction in the flying clearance increases the risk of contact between the head and the surface of the traveling recording medium, which in turn increases the possibility of causing a head crash.

Therefore, as a means to solve such problems, for example, a magnetic head (
Japanese Patent Publication No. 44-18667) is known.

This consists of a slider 1 that floats by generating only positive pressure on the surface of a traveling recording medium, and a magnetic head 2 that is equipped with an electromagnetic transducer.
and a support spring 3 that applies a pressing force to the magnetic head 2 to support it, and a fixing device for the attachment point of the support spring,
It is formed of a plurality of pads 4 having spherical surfaces, and is configured to fly with a larger flying gap than the magnetic head 2. The floating gap of the magnetic hand 2 is several microns (lt), and the floating gap of the pad 4 is approximately several tens of microns (lt). If there is an assembly error in the device, the floating gap of the pad 4 will change, but since the floating gap amount in the normal setting is already large enough, the amount of change is small, and there is a possibility that the pad 4 will come into contact with the surface of the recording medium. There was almost no problem, and good levitation reliability was ensured.

However, such magnetic heads have the following problems.

That is, in order to increase the recording density of a magnetic disk device, it is necessary to reduce the flying gap of the magnetic head 2, which is 0.5
There is a need to realize a floating clearance on the order of μm. By the way, waviness generally exists on the surface of a recording medium, and the amount of fluctuation in the flying gap due to the waviness is as follows:
It is almost independent of the amount and is determined by the slider length t and the wavelength of the waviness (t/L). Therefore, it is proportional to
This amount of variation becomes more obvious as the flying gap becomes smaller [7. It is necessary to shorten the slider length (a) because the risk of contact between the magnetic head and the recording medium surface, and even head crash, increases. . Also, considering the case where the magnetic head and the recording medium surface come into contact even temporarily, if the pressing force by the support spring 3 is large, there is a risk that the magnetic head 2 will significantly damage the recording medium surface and cause a head crash. Highly sexual. Therefore, in order to minimize damage during contact, it is necessary to reduce the pressing force.

Shortening the slider length η) and reducing the pressing force described here will lead to a decrease in the rigidity of the air film of the slider 1, so
When an external force is applied to the support material of the magnetic head 1, the flying gap of the magnetic head 1 tends to change. The head mechanism has the drawback of not being able to solve this problem.

Furthermore, because the conventional mechanism has a complicated structure, it has to be large in order to reduce assembly precision.However, attempts have been made to downsize the slider and reduce the invalid area on the surface of the recording medium that is not involved in recording and reproduction. As a result, assembly precision becomes difficult. In addition, since a positive pressure slider is used as the slider of the magnetic head, a load mechanism is required, and there is a drawback that assembly becomes difficult if an attempt is made to downsize the slider and support mechanism.

[Summary of the invention]

The present invention has been made in view of the above-mentioned points, and includes a first magnetic head that flexibly supports a magnetic head formed of an electromagnetic transducer.
The slider is composed of a negative pressure-utilizing slider having a positive pressure generating section and a negative pressure generating section, and the fixed end of the supporting mechanism that floats above the recording medium surface and flexibly supports the magnetic head is joined. By configuring the second slider with at least two independent air bearing surfaces or a slider having an air bearing surface surrounding the center of the slider, and arranging the first slider between the air bearing surfaces, the structure can be simplified. The purpose of the present invention is to provide a floating head mechanism that stably floats in a minute gap.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 2 is a perspective view showing an embodiment of the floating head mechanism according to the present invention. In the figure, 10 is an electromagnetic converter, 11
is a negative pressure utilizing slider (first slider) that includes a negative pressure generating section 12, and constitutes a floating magnetic head 20.

Reference numeral 13 denotes an integrally formed slider (second slider), which has a pair of left and right air bearing surfaces 14 located on both sides of the magnetic head 200. In this embodiment, a planar slider (cheaper fugit type slider) having a tapered portion 15 is shown. Reference numeral 16 denotes a cymbal (first support mechanism) that flexibly supports the magnetic head 20 on the slider 13, and its fixed end is the second slider 13. Reference numeral 17 designates a part of a cymbal spring (second support mechanism) that flexibly supports the slider 13 from a not-illustrated head arm (fixing member) that can be positioned on the disk surface. Note that arrow 18 indicates the direction of movement of the recording medium surface.

Next, the operational effects and the like of the floating head mechanism having the above configuration will be explained.

First of all, the negative pressure utilization type slider 11 has a widening shape with a gap such as a step formed on a part of the pressure generating surface of the slider, thereby generating negative pressure, and reducing the force of the difference between the positive pressure and the negative pressure. A stable floating state is obtained by applying external spring load. In this negative pressure utilization type slider 11, the magnitude relationship between the positive pressure and negative pressure generated on the reaction force generating surface is as follows.
Since #1 can be arbitrarily determined, for example, if both are made equal, a stable floating state can be obtained even without an external pressing load, and the air film rigidity of the slider, which is approximately proportional to positive pressure, can be made sufficiently large. It has advantages.

If the magnetic head 20 is configured with such a negative pressure utilizing slider 11, the loading mechanism may be omitted or only a simple loading mechanism may be provided. In addition, since the rigidity of this air film can be made sufficiently large by reducing the spring load to zero, the slider 1
It is easy to set the rigidity to a sufficiently large value compared to the rigidity of the support mechanism 1B against pitching and rolling motions. Therefore, even if the slider length is made sufficiently small to reduce fluctuations in the flying gap due to ridges on the surface of the traveling recording medium, the influence of the external force applied from the support mechanism 16 can be sufficiently reduced. Since the influence of the external force applied from the support mechanism 16 is sufficiently small, even if the magnetic head 20 and the support mechanism 16 are made small, strict assembly precision is not required.

the second support mechanism 16 to which the fixed end of the first support mechanism 16 is joined;
The slider 13 only needs to fly with a flying clearance several to ten times larger than the flying height of the magnetic head 20, and for this reason, a second support mechanism consisting of a conventionally widely used tapered flat slider and cymbal spring is used. 11 can be easily realized. The second slider 13 can be attached to the recording medium surface by a few gigameter (30 micrometers) even when there are variations in the relative dimensions of the head arm (not shown) and the recording medium surface, or when there is a runout on the recording medium surface. (b) The position is adjusted to a relative gap of approximately For this reason, the support machine 411 of the magnetic herad 20
Fluctuations in the flying clearance caused by errors in the relative dimensions between the mounting surface of the slider 1B, that is, the double-barreled slider 13, and the recording medium surface can be completely ignored.

Furthermore, a negative pressure utilization type slider 1 having an electromagnetic conversion section 10
1 on the airflow outflow end side of the central groove portion 18 of the second slider 13), the negative pressure utilization type slider 1
No. 1 is completely unaffected by fluctuations in the floating gap due to airflow. Further, the structure of the first support mechanism 16 that connects the second slider 13 and the magnetic head 20 may be simple as long as it has high rigidity in the sheet direction, for example, it may be a thin plate as shown in FIG. Cymbal 1 without formed load spring
6 is fine. Alternatively, as shown in FIG. 4, it is also possible to use the cymbal 16 as an input/output terminal to easily take out the signal output from the magnetic head 20. Note that FIG. 4 shows a case where a twin-barrel type slider utilizing negative pressure is used as the second slider 13. In this case, such a double-barreled negative pressure slider that serves as the mounting frame for the magnetic head 20 is
Since it only has one small negative pressure slider 11 inside, there is no need to increase the size compared to conventional magnetic heads, and therefore it can be made of a single material (e.g. Feray, At5Os Tic). By forming it, no extra adjustment is required and it can be used as a highly accurate mounting frame.

In FIG. 2, a pair of left and right air bearing surfaces 14 are provided on the second slider 13, but it goes without saying that more than one pair of air bearing surfaces 14 may be provided.

〔Effect of the invention〕

As explained above, in the floating head mechanism according to the present invention, the first slider is configured with a negative pressure type slider, and the second slider is provided with at least two air bearing surfaces or an air bearing surface surrounding the central portion of the slider. Since the first slider is arranged between the air bearing surfaces, it is easy to levitate the electromagnetic transducer stably with a minute air gap even on a medium with large undulations, and the slider and Even if the support mechanism is miniaturized, there is no need to tighten assembly precision, so a floating head mechanism capable of high recording density can be easily constructed.
The effect is very large.

[Brief explanation of the drawing]

FIGS. 1(a) and (1)) are a perspective view from above and a perspective view from below showing an example of a conventional floating head mechanism, and FIG. 2 is an example of a floating head mechanism according to the present invention. FIG. 3 is a plan view showing an example of the cymbal, and FIG. 4 is a perspective view showing another embodiment in which the cymbal is used as an input/output terminal. 10... Φ Electromagnetic conversion section, 11... 0 Negative pressure utilization type slider (first slider), 12... Negative pressure generation section, 1
3...φ・Second slider, 14...@e air bearing surface, 16
...Cymbal (first support mechanism), 1T, e-cymbal gene (second support mechanism), 20..., @magnetic head. 11- Figure 1(b)

Claims (1)

[Claims] 1 on the first slider floating above the surface of the traveling recording medium!
A first plate that flexibly supports a magnetic head formed by electromagnetic transducer.
A fixed end of the support mechanism is joined to a second slider floating above the recording medium surface, and the second support mechanism that flexibly supports the second slider can be positioned on the disk surface. In the floating head mechanism joined to a fixed member, the first slider is constituted by a negative pressure utilizing type slider having a positive pressure generating section and a negative pressure generating section on the air bearing surface, and the second slider is configured to include: A floating head mechanism comprising at least two independent air bearing surfaces or air bearing surfaces surrounding a central portion of the slider, the first slider being disposed between the air bearing surfaces.