JPS63113989A - Floating head slider - Google Patents

Abstract

PURPOSE:To stabilize the floating posture of a slider by forming a notch part different at the outer circumferential side and at the inner circumferential side on the floating surface of a floating head slider, and generating the approximately floating force between both. CONSTITUTION:When a taper part 6 formed at a floating surface 4 is the part formed on a floating surface 4a at the inner circumferential side to disk media and the part formed on a floating surface 4b at the outer circumferential side, the length of a taper part 6b formed at the outer circumferential side is set longer. The difference in the length between the inner circumferential side of such a taper part 6 and the outer circumferential side corresponds to the difference in the floating force to occur at floating surfaces 4a and 4b with the inner circumferential side and the outer circumferential side to disk media, and the length comes to the one to be able to cancel the difference in these floating forces. Consequently, thus, by changing the length of the taper part 6 of the floating surface 4 at the inner circumferential side and the outer circumferential side, a floating head slider 2 can be floated in the stable condition to the disk media.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a floating head slider for a magnetic disk device with stable floating.

<Prior Art> FIGS. 11 and 12 show a floating head slider 30 in a conventional magnetic disk device. This floating head slider 30 is for recording and reproducing information by facing a disk medium rotating at high speed in a magnetic disk device without contacting it, and is a twin-body type having air bearing surfaces 32 on the left and right sides. A tapered portion 34 is formed in front of it. Further, FIG. 13 shows a floating head slider 38 in which the taper portion is a step portion 36.

<Problems to be solved by the invention> However, such a floating head slider 30 etc.
As shown in FIG. 4, since the air bearing surface 32 is arranged along the circumferential direction of the disk medium 40, the running speed of the left and right air bearing surfaces 32 relative to the disk medium 40 is different, and therefore the air bearing surface 32 is located on the inner circumferential side of the disk medium 40. A difference occurs between the floating blades of the floating surface 32 located on the outer peripheral side and the floating blades of the floating surface 32 located on the outer circumferential side, and the flying posture of the floating head slider 30 becomes unstable. In the figure, 42 is the center of rotation of the disk medium 40. This means that when the disk medium 40 has a large diameter, the gap between the floating surfaces 32 is small compared to the diameter, so the unbalance of the floating blades is not so much of a problem. There is a problem in that the speed difference between the speed at the surface 32 and the speed at the air bearing surface 32 on the inner peripheral side becomes relatively large, which deteriorates the flying stability of the floating head slider 30.

On the other hand, as a means to solve this problem, there is a conventional floating head slider in which the width of the floating surface 32 on the outer circumferential side is made smaller than the width of the floating surface 320 on the inner circumferential side to eliminate the unbalance of the floating blade. However, if the width of the floating surface 32 is changed, the floating blade will change at a rate approximately equal to the cube of the change, so in order to obtain the desired floating blade, the width of the floating surface must be widened. The problem was that high accuracy was required.

Means for Solving the Problems> Therefore, in the present invention, different notches are formed on the outer circumferential side and the inner circumferential side on the floating surface of the floating head slider so that almost the same floating blade is created between the two. This stabilizes the flying attitude of the floating head slider.

Embodiment> FIG. 1 shows an embodiment of the floating head slider 2 according to the present invention, which is generally of a double body type with floating surfaces 4 on the left and right sides, and as described in the conventional example, This floating surface 4 is arranged in the G1 disk device along the circumferential direction of a disk medium (none of which is shown) in the G1 disk device. It is provided facing the disk medium without contacting it, so that magnetic recording and reproduction can be performed between the disk medium and the disk medium.

The unique features of this floating head slider 2 are:
As shown in FIG. 2, the length of the tapered portion 6 formed on the floating surface 4 is the same as that of the floating surface 4a on the inner peripheral side with respect to the disk medium, and that on the floating surface 4b on the outer peripheral side with respect to the disk medium. The tapered portion 6b formed on the side is set longer. The difference in length between the inner circumferential side and the outer circumferential side of the tapered portion 6 is
The length is such that it corresponds to the difference in floating blades that occurs between the inner and outer floating surfaces 4a and 4b with respect to the disk medium and can eliminate the difference in these floating blades. Therefore, by changing the length of the tapered portion 6 of the floating surface 4 between the inner circumferential side and the outer circumferential side in this way, the floating head slider 2 can be stably floated relative to the disk medium.

FIG. 3 shows such a floating head slider 2 from the side.

In FIG. 4, the tapered portion 6 is formed as a step portion 8,
The lengths of the inner circumferential side and the outer circumferential side of the step portion 8 are changed to match the respective floating blades.

In FIG. 5, the tapered portion 10 is inclined with respect to the floating surface 4, and its length is such that the floating blades are equal on the inner circumferential side and the outer circumferential side, as in the above example. FIG. 6 is a front view thereof.

FIG. 7 shows the boundary 14 between the step portion 12 and the floating surface 4.
It is tilted. Further, as shown in FIG. 8, the boundary 14 between the outer circumferential side and the inner circumferential side may be formed in a straight line, regardless of whether it is stepped or tapered.

9 and 10 show a floating head slider 18 having a negative pressure generating section 16 in which the step section 20 is made longer toward the outer circumference.

According to the floating head slider 2 and the like described above, the floating blades on the inner circumferential side and the outer circumferential side can be made equal,
Floating in a stable state can be achieved. Moreover, the formation of the various notches described above can be achieved by flatly polishing the floating surface 4 in the tapered portion 6 described in the example or FIG. 1, and then adding parallel step polishing to each floating surface 4a and 4b. In addition, in the step part 8 described in FIG. 4 etc.,
It can be easily obtained by placing a mask of a desired shape on the flat and polished floating surface 4 and etching it.

<Effects of the Invention> As mentioned above, the present invention makes the floating blades on the inner and outer circumferential sides equal by making the lengths of the step portion or the tapered portion of the floating surface different. Therefore, the floating head slider can be floated in a stable state, and the step or taper part formed on the floating surface has a much smaller effect on the floating blade than changes in the width direction of the floating surface. The tolerance can be made much looser than when machining the width of the floating surface, so machining to obtain a desired floating edge can be easily performed.

[Brief explanation of the drawing]

1 to 10 are related to the present invention; FIG. 1 is a perspective view showing one embodiment of a floating head slider, FIG. 2 is a bottom view of FIG. 1, and FIGS. 3 and 4 are 5 is a bottom view of another embodiment, FIG. 6 is a front view of another embodiment, and FIGS. 7, 8, and 9 are other embodiments. A bottom view of the example, FIG. 10 is a side view of FIG. 9,
11 to 13 show a conventional example of a floating head slider. FIG. 11 is a bottom view, FIG. 12 is a side view of FIG. 11, FIG. 13 is a side view of another example, and FIG. The figure is an explanatory diagram showing a floating head slider and a disk medium. In the drawing, 2.18, 30, 38 are floating head sliders, 4.32
6.10, 34 are tapered parts; 8.12, 20, 36 are step parts; 14 is a boundary; 16 is a negative pressure generating part. Patent applicant: Agent of Nippon Telegraph and Telephone Corporation

Claims (3)

[Claims] (1) In a twin-hulled floating head slider having two air bearing surfaces with a taper or step for use in a magnetic disk device, the tapered portion or step portion of the air bearing surface on the outer peripheral side of the disk of the floating head slider is located at the inner periphery of the disk. A floating head slider characterized in that the side air bearing surface is longer than a tapered part or a step part. (2) The tapered portion or step portion of the air bearing surface of one or both of the floating head sliders is made longer toward the outer periphery of the disk.
Floating head slider as described in section. (3) A floating head slider having a negative pressure generating section, characterized in that the length of the tapered section or step section is increased toward the outer circumference.