JPH0278077A - Floating head slider - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating head slider for a magnetic disk device, and particularly to a floating head slider for rotating a recording medium suitable for a high recording density, high reliability magnetic disk device. The present invention relates to a floating head slider with little accompanying fluctuation in flying height.

[Conventional technology]

As described in Japanese Patent Publication No. 57-569, a conventional floating head slider for a magnetic disk device is supported so as to make pitching and rolling movements relative to the surface of the magnetic disk, a magnetic slide comprising three longitudinally extending rails laterally spaced apart on a surface opposite the surface; a magnetic slide in longitudinal succession with a central rail of said rails and rearward of said magnetic transducer; The rail has a magnetic core provided at the end thereof, and at least the two outer rail surfaces of the rail form air bearing surfaces.

[Problem to be solved by the invention]

The prior art of a floating head slider will be explained with reference to FIGS. 11 and 12.

FIG. 11 is a side view showing the floating state of a conventional floating head slider, and FIG. 12 is an explanatory diagram showing the generation of streamlines and vortices in the conventional floating head slider.

As shown in FIG. 11, a conventional floating head slider 1'
is supported by a suspension mechanism 3, and floats by forming an air bearing film between the recording medium 2, such as a rotating magnetic disk, and the flat air bearing surface 6 and tapered part 5, which are floating rails. There is.

A magnetic spatula 1<8 for reading/writing data on the recording medium 2 is attached to the outflow side end surface (hereinafter referred to as the outflow end surface) 7 of the floating head slider 1'. The distance between the magnetic core gap portion 9 and the recording medium 2, which has a large effect on the recording capacity of a magnetic disk device, is generally called a floating point: hth.

FIG. 12 shows streamlines 20 representing the air flow (wind) accompanying the rotation of the recording medium 2 when the floating head slider 1' is viewed from the side. Air accompanying the rotation of the recording medium 2 flows from the inflow end surface 4 of the floating head slider 1' to the surface opposite to the flying direction 6 that faces the recording medium 2 (hereinafter referred to as the slider back surface 12), and A gap 10 is made on the inflow end side.

This vortex 10 is repeatedly generated, dissipated, and separated,
Every time formation or separation occurs, the slider is vibrated up and down at the corners based on the principle of conservation of motion.

This applied excitation force F causes the gap (flying height h) between the floating head slider 1 and the recording medium 2 to fluctuate, causing malfunctions in reading/writing data. Further, if the flying height is significantly reduced due to the fluid excitation angle, there is a problem in that the floating head slider 1' and the recording medium 2 come into contact and the data stored on the recording medium 2 is destroyed.

The present invention has been made to solve the problems of the prior art described above, by eliminating the vortices generated on the back surface of the slider and reducing the fluid excitation force.

The object is to provide a floating head slider with less variation in flying force.

[Means to solve the problem]

In order to achieve the above object, a floating head slider according to the present invention forms an air film on a rotating recording medium, floats above the recording medium, and reads and writes information on the recording medium. In a floating head slider of a magnetic disk device, air inflows into the floating head slider at right angles to the direction of rotation of the recording medium on the back surface of the slider opposite to the flying surface of the floating head slider facing the recording medium surface. A pneumatic guide portion formed from the side end face is provided.

As an additional note, the above purpose is achieved by providing an air guide section on the back surface of the slider of the floating head slider so that the wind (air) caused by the rotation of the recording medium flows smoothly around the slider. This is achieved by eliminating vortices.

[Effect]

An air guide section provided on the back surface of the slider near the air inflow end of the floating head slider allows air to flow smoothly around the slider as the recording medium rotates. Therefore, due to the sudden change in the flow direction, the flow that was occurring at the joint between the inflow end face and the back surface of the slider is no longer <M (flow opposite to the direction of movement of the recording medium). Since no flow vortices are generated on the back surface, the fluid (
The vortex) excitation force no longer acts on the floating head slider, and the fluid vibration of the floating head slider is reduced.

Therefore, the floating head slider maintains a constant flying height and stably flies above the surface of the recording medium that rotates once, eliminating malfunctions in reading/writing the DESO.

〔Example〕

Embodiments of the present invention will now be described with reference to FIGS. 1 to 10.

1 is a side view of a floating head slider according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an explanatory diagram showing streamlines around the slider in FIG. 1, and FIG. The figure is a diagram comparing the static pressure distribution around the slider between the conventional example and the embodiment shown in FIG.

In each figure, 1 is a floating head slider for a magnetic disk device, 2 is a rotating recording medium such as a magnetic disk,
3 is a suspension mechanism whose details are not shown; 4 is an inflow end surface of the floating head slider on the air inflow side; 5 is an inflow end surface of the floating head slider;
6 is a floating surface which is a flat part of the floating rail; 7 is an outflow end surface of the air outflow side of the flying head slider; 8 is a magnetic head;
Reference numeral 2 designates the back surface of the slider, which is the surface opposite to the floating surface 6, and reference numeral 13 designates an air guide portion provided on the inflow end surface 4 side of the slider back 12.

As shown in the figure, the floating head slider 1 uses the wedge effect of the tapered part 5 of the floating rail and the floating surface 6 to convert the air generated by the rotating recording medium 2 into a submicron-order air film. The recording medium 2 is formed and floats above the recording medium 2, and is supported and positioned by a suspension mechanism 3. Note that the magnetic head 8 is provided on the outflow end face 7.

In the first embodiment, a wedge-shaped air guide portion 13 is provided on the slider back surface 12 and widens from the upper end of the inflow end face 4 toward the outflow end of the slider. The air guide section 13 is
It is attached to the back side of the slider 12 with adhesive, etc.
It is not necessarily necessary to form it integrally with the floating head slider 1.

FIG. 2 is a plan view of FIG. 1 viewed from the suspension mechanism 3 side.

The width E of the wedge-shaped air guide portion 13 attached to the slider back surface 12 is the same as the width W of the flying head slider 1, and is constant in the width direction.

Note that the width E of the air guide portion 13 is the same as that of the flying head slider 1.
The width W may be greater than or equal to the width W (E≦W).

The operation of such a floating head slider 1 will be explained with reference to FIG. The arrows 20 shown in FIG. 3 are air flows or streamlines.

Air hitting the inflow end surface 4 of the floating head slider 1 is divided into two directions: the slider back side 12 and the floating rail surface facing the recording medium 2, and flows toward the rear of the slider. Floating surface 6
Since the gap h (floating f) between the floating head slider 1 and the recording medium 2 is on the order of submicrons and is sufficiently small compared to the slider height H, almost no air flows between the floating head slider 1 and the recording medium 2. Therefore, most of the air that hits the inflow end face 4 flows toward the rear side 12 of the slider. Slider back 1
The air flowing through the slider 2 smoothly flows along the back side 12 of the slider by the air guide section 13. Therefore, the vortex 10 that was generated behind the conventional floating head slider 1' shown in FIG. 12 is no longer generated.

Therefore, since the excitation force (fluid force) of the vortex 10 shown in FIG.
f1) is held constant, thereby eliminating data read/write malfunctions of the magnetic head 8.

The effects of this embodiment will be explained with reference to a diagram of static pressure distribution around the slider shown in FIG.

FIG. 4(,) shows the conventional floating head slider shown in FIG. 11, and FIG. 4(b) shows the floating head slider shown in FIG. 1, each with symbols for each part. , FIG. 4(c) compares the static pressure distribution around the slider, with one solid line for the conventional type and a broken line for the embodiment (invention). In FIG. 4(Q), the horizontal axis represents each part of the floating head slider, and the vertical axis represents static pressure.

The center point of the inflow end surface 4 of the conventional floating head slider (see FIG. 4(a)) is A, the meeting point of the inflow end surface 4 and the back surface is B,
Let C be the intermediate point between point B and the installation position of the suspension mechanism 3, D be the meeting point of the slider back surface 12 and the outflow end surface 7, and E be the center point of the outflow end surface 7.

In this embodiment (see FIG. 4(b)), the 0 point is the apex of the air guide portion 13, and the other points are at the same positions as in the conventional type.

As is clear from Fig. 4(c), in the conventional floating head slider, the static pressure is positive at point A, but the pressure rapidly decreases at point B, resulting in a negative pressure lower than atmospheric pressure. The static pressure distribution occurs, becomes positive between 80 and then becomes negative again at point D.

In comparison, in this example, negative static pressure is not generated at 8 points, but slightly negative static pressure is generated at 6 points. In addition, the negative pressure at point D is smaller than that of the conventional type.In other words, in the conventional floating head slider, the static pressure changes rapidly from point A to point D, but in this example, the static pressure There are few fluctuations in pressure, and there are few vortices generated due to pressure fluctuations.

According to this embodiment, the wind (air) accompanying the rotation of the recording medium can be smoothly guided from the inflow end face of the four-motion head slider to the inflow end face. For this reason, the static pressure distribution around the slider changes rapidly from positive to negative static pressure between the inflow end and the outflow end in the conventional floating head slider, as shown in Figure 4(c). On the other hand, in this example,
By narrowing the region of negative static pressure, pressure fluctuations can be reduced, and vortices generated from the inflow end face of the floating head slider to the back surface of the slider can be eliminated.

Therefore, the fluid vibrations of the slider caused by the generation and dissipation of vortices are eliminated, and fluctuations in the distance between the recording medium and the floating head slider (:4) can be reduced, which improves the reliability of the magnetic disk drive. can be improved.

Next, FIG. 5 is a side view of a floating head slider according to another embodiment of the present invention, and FIG. 6 is a plan view thereof. Since this is the same part as the example, its explanation will be omitted.

Outflow end surface 7 of floating head slider lA shown in FIGS. 5 and 6
A thin film magnetic head 15 is provided on the slider, and an air guide section 14 is attached to the slider back surface 12. This air guide portion 14 is characterized in that the apex angle of the triangle facing the surface bonded to the slider back surface 12 is an obtuse angle.

This air guiding section 14 is expected to produce the same effects as the embodiments shown in FIGS. 1 and 2 above. Further, as an effect specific to the embodiment shown in FIGS. 5-6, the air flow expanded by the IJ direction in the figure is again reduced by the JK direction and flows along the slider back surface 12. Therefore, the vortex generated behind the outflow end face 7 of the slider can also be reduced at the same time. Therefore, the excitation force exerted on the floating head slider by the vortex generated behind the slider is reduced, and fluctuations in the flying height of the slider are reduced.

Next, FIG. 7 is a side view of a floating head slider according to still another embodiment of the present invention, and FIG. 8 is a plan view thereof. Since they are equivalent parts, their explanation will be omitted.

Outflow end surface 7 of floating head slider IB shown in FIGS. 7 and 8
A thin film magnetic head 15 is provided on the slider, and an air guide section 16 is attached to the slider back surface 12. This air guide portion 16 has a half-cylinder shape of an elliptical cylinder, and the surface that is bonded to the slider back surface 12 is a flat surface, and the other surfaces are curved surfaces having a streamlined shape.

As a result, the same effects as in the embodiments shown in FIGS. 1 and 2 can be expected. In addition, in the embodiment shown in FIGS. 7 and 8, the air flow around the slider expanded at the IJ' surface of the air guide section 16 is again reduced in the plane J', similar to the embodiment shown in FIGS. 5 and 6. , it can flow smoothly to the outflow side along the slider back surface 12.

In the embodiments shown in FIGS. 7 and 8, since the air guide portion 16 has a curved surface, it is possible to smoothly guide air to the outflow end with a smaller shape than in the previous embodiments. For this reason, the air guide section 1
This embodiment has the advantage that the change in the mass of the slider itself due to the attachment of the slider 6 is small, and the load placed on the suspension mechanism 3 is small.

Next, FIG. 9 is a side view of a floating head slider according to still another embodiment of the present invention, and FIG. 10 is a plan view thereof. In FIG. Therefore, its explanation will be omitted.

A thin film magnetic head 15 is provided on the outflow end surface 7 of the floating head slider IC shown in FIGS. 9 and 10, and a thin film magnetic head 15 is provided on the slider back surface 12 in a substantially symmetrical manner in front and behind the suspension mechanism 3. Air guide portions 13a and 13b are provided on the inflow end face 4 side and the outflow end face 7 side, respectively.

As a result, the same effects as in the embodiment shown in FIG. 1 can be expected. Furthermore, as an effect unique to this embodiment.

By installing the two air guide parts 13a and 13b before and after the suspension mechanism 3, the wind does not directly hit the suspension mechanism 3, eliminates vortices generated from the suspension mechanism 3, and allows the air to flow smoothly into the slider. It can be guided to the outflow end. As a result, the vortex generated behind the slider outflow end face is eliminated, and the same effects as in the second and third embodiments can be expected. Further, fluid vibration of the suspension mechanism due to wind turbulence can be reduced.

〔Effect of the invention〕

As described above, according to this embodiment, by eliminating the vortices generated behind the slider and reducing the fluid excitation method, it is possible to provide a floating head slider with less fluctuation in flying force.

[Brief explanation of the drawing]

1 is a side view of a floating head slider according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an explanatory diagram showing streamlines around the slider in FIG. 1, and FIG. The figure is a diagram comparing the static pressure distribution around the slider between the conventional example and the embodiment shown in FIG. 1, and FIG. 5 is a graph comparing the static pressure distribution around the slider. FIG. 6 is a side view of a floating head slider according to another embodiment of the present invention; FIG. 7 is a side view of a floating head slider according to still another embodiment of the present invention; FIG. 8 is a side view of a floating head slider according to still another embodiment of the present invention; is a plan view thereof, FIG. 9 is a side view of a floating head slider according to still another embodiment of the present invention, FIG. 10 is a plan view thereof, and FIG. 11 is a floating state of a conventional floating head slider. FIG. 12 is an explanatory diagram showing the generation of streamlines and vortices in a conventional floating head slider. 1. LA, IB, LC-? J11h Head Sly'j,
2... Recording medium, 3... Suspension mechanism, 4... Inflow end surface, 6... Air bearing surface, 7... Outflow end direction, 12... Slider back surface. 13, L 3 a, l 3 b, l 4
, L 6 - air guide. ¥20,000 3 mouths ¥4 (α) + b) ↑ 5th flash ¥41 Kaya'7 country 8th flash 9 mouth 410 holes 11th country

Claims (1)

[Claims] 1. A floating head slider for a magnetic disk device that forms an air film on a rotating recording medium and floats above the recording medium to read and write information on the recording medium,
an air guide section formed from an air inflow side end surface of the floating head slider perpendicular to the rotational direction of the recording medium, on the back surface of the slider opposite to the air bearing surface of the floating head slider facing the recording medium surface; A floating head slider characterized by being provided with. 2. In a floating head slider of a magnetic disk device that forms an air film on a rotating recording medium and floats above the recording medium to read and write information on the recording medium,
on an air inflow end face side and an air outflow end face side of the floating head slider that are perpendicular to the rotational direction of the recording medium on the back surface of the slider opposite to the air bearing surface of the floating head slider facing the recording medium surface; A floating head slider characterized in that air guide portions are provided symmetrically around a suspension mechanism of the floating head slider.