JPH0845221A - Flying magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the flying height of the slider and increase the restoring force during rolling. [Structure] On the surface 30 of the slider 28 facing the disk,
A groove 31 is provided in the center, and rail surfaces 32 are provided on both sides of the groove 31.
A and 32B are formed. The depth of the groove 31 is 20
It is set to less than or equal to μm, in this example, 5 to 10 μm. In the floating magnetic head 14, the depth h of the concave groove 31 is shallower than in the conventional case, so that the buoyancy acts on the bottom surface 31A of the concave groove 31 in addition to the rail surfaces 32A and 32B. Therefore, the flying height H increases. The buoyancy F3 of the bottom surface 31A is
Since it is smaller than the buoyancy F1 and F2 of the rail surfaces 32A and 32B, the restoring force G that acts when the slider 28 rolls increases, and the slider 28 is immediately returned to the horizontal position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head suitable for application to hard disks, magneto-optical disk devices and the like.

[0002]

2. Description of the Related Art In rewritable hard disks, magneto-optical disk devices, etc., floating magnetic heads have come to be used in order to improve reliability. Figure 7
Shows the configuration of a general magneto-optical disk device 1. The figure shows a state in which the cabinet is removed. The magneto-optical disk device 1 includes a rewritable magneto-optical disk 11
Is driven to rotate by the spindle motor 12. An optical pickup 13 is arranged on the lower surface side of the magneto-optical disk 11,
A floating magnetic head 14 is arranged on the upper surface side.

Optical pickup 13 and floating magnetic head 1
4 is attached to the moving part 15, and this is attached to the movable part 17 of the linear motor 16. As a result, the optical pickup 13 and the floating magnetic head 14 move linearly in the radial direction of the magneto-optical disk 11. The light emitted from the optical system block 18 is supplied to the optical pickup 13 via a prism 19 in the moving unit 15. Further, the light reflected by the magneto-optical disk 11 is received by the optical system block 18 via the optical pickup 13 and the prism 19. The spindle motor 12, the linear motor 16, and the optical system block 18 are fixed on the chassis 20.

FIG. 8 is a perspective view of the floating magnetic head 14 as viewed from below. The magnetic head 14 includes a moving unit 15
A load beam 22 as an elastic arm is provided at the tip of a fixed portion 21 attached to (FIG. 7). An opening 23 is provided on the root side of the load beam 22, and the spring constant of the load beam 22 is appropriately set by this. A fixed portion 25 of a flexure 24 as a holding portion is fixed to the tip of the load beam 22 by, for example, spot welding, and a slider 28 is attached to a leaf spring-like displacement portion 27 provided below the fixed portion 25. A magnetic pole 29 is fitted in the slider 28, and information is recorded on the magnetic recording material of the magneto-optical disk 11 by the magnetic field generated from the magnetic pole 29.

Magneto-optical disk 11 of conventional slider 28
As shown in FIG. 9, a groove 31 having an appropriate width B and a depth h is provided at a substantially central portion of the surface 30 opposed to and along the disc rotation direction. Rail surfaces 32A and 32B are provided. The magnetic pole 29 is fitted on the air outflow end 33 side of one rail surface 32B, and on the air inflow end 34 side of both rail surfaces 32A and 32B.
Tapered portions 35A and 35B are provided to help the inflow of air.

Such two rail surfaces 32A, 32B
As shown in FIG. 10, when the air moving along with the rotation of the magneto-optical disk 11 flows into the lower side of the facing surface 30, the slider 28 having the buoyancy F1 and F2 acts on the slider 28 by the dynamic pressure of the inflowing air. And the slider 28
Emerges. This can prevent the magneto-optical disk 11 from being scratched. Also, rail surfaces 32A, 3 on both sides
Since the buoyancy forces F1 and F2 act on 2B, even when the slider 28 rolls to the left and right as shown by the chain double-dashed line in the figure, the restoring force G acts to return the slider 28 horizontally.

[0007]

By the way, in the above slider 28, the flying height is as low as possible, for example, 0.
The depth h of the groove 31 is set to 500 μm in order to suppress it to about 5 μm.
It was deepened to about m so that buoyancy was not generated on the bottom surface 31A of the concave groove 31. As a result, the slider 28
The buoyancy acting on is only the buoyancy F1 + F2 acting on both rail surfaces 32A and 32B.

On the other hand, in the magneto-optical disk device 1 and the like, the magnetic field required for recording reaches up to several 100 μm,
In addition, since the recording surface of the magneto-optical disk 11 has many irregularities, and because the magneto-optical disk 11 can be replaced, dust is likely to enter due to its structure. Therefore, the flying height of the slider 28 is required to be several μm or more. There is.

In such a case, when the conventional slider 28 is used, since the flying height is low, the slider 28 collides with the magneto-optical disk 11, and the magneto-optical disk 11
There is a problem in that the recording or erasing cannot be performed normally due to scratches on the surface or the slider 28 is displaced and the reliability is impaired.

In order to solve such a problem, if the recessed groove 31 of the slider 28 is eliminated and the facing surface 30 is made flat, the flying height becomes high, and the air outflow end 33 of the slider 28 comes to the magneto-optical disk 11. Although the possibility of contact is reduced, the restoring force G when the slider 28 rolls is insufficient, so that the side end 36 of the slider 28 is more likely to contact the magneto-optical disk 11 this time.

Therefore, the present invention solves the above-mentioned problems, and proposes a flying type magnetic head in which the flying height of the slider is high and the restoring force at the time of rolling can be increased. Is.

[0012]

In order to solve the above-mentioned problems, in the present invention, an arm slidably arranged in the radial direction of the disk and a tip end of the arm are arranged.
A flying magnetic head having a slider that receives air moving as the disk rotates and floats, a magnetic pole attached to the slider, and a displaceable holding portion interposed between the slider and the arm. A groove having a depth of 20 μm or less is provided on the surface facing the disk along the moving direction of air, and slide surfaces are provided on both sides of the groove.

[0013]

As shown in FIG. 1, a surface 30 of the slider 28 facing the disk is provided with a groove 31 at the center thereof, and rail surfaces 32A and 32B are formed on both sides thereof. Groove 3
The depth h of 1 is 20 μm or less, and is set to 5 to 10 μm in this example. As shown in FIG. 2, since the depth h of the concave groove 31 of the floating magnetic head 14 is shallower than that of the conventional one, the buoyancy is not limited to both rail surfaces 32A and 32B, and the bottom surface 3 of the concave groove 31 is not included.
Also works on 1A. Therefore, the flying height H increases. Further, the buoyancy F3 of the bottom surface 31A is
Since it is smaller than the buoyancy F1 and F2 of 32B, the slider 28
The restoring force G that acts when is rolled increases, and the slider 28 is immediately returned to the horizontal position.

[0014]

Embodiments of the floating magnetic head according to the present invention will now be described in detail with reference to the drawings. In addition,
The same parts as those described above are designated by the same reference numerals, and detailed description thereof is omitted.

FIG. 1 shows a floating magnetic head 1 according to the present invention.
It is the perspective view which looked at a part of 4 from the bottom. The floating magnetic head 14 is applied to the magneto-optical disk device 1 (FIG. 7), and is fixed to the moving unit 15 (see FIG. 1).
A load beam 22 as an arm having an appropriate spring constant is provided at the tip of 0), and a flexure 24 as a holding portion is fixed to the tip by, for example, spot welding. The flexure 24 is provided with a leaf spring-like displaceable displacement portion 27, and a slider 28 is bonded to the lower surface thereof.

A concave groove 31 having a width B is provided in the center of the surface 30 of the slider 28 facing the magneto-optical disk 11. The depth h of the groove 31 is set to 5 to 10 μm. This is a depth at which the flying height H of the slider 28 can be increased and the restoring force G during the upper roll can be increased as described later. Both sides of the groove 31 are rail surfaces 32
A and 32B. A magnetic pole 29 for generating a magnetic field is attached to the rail surface 32B on the air outflow end 33 side. Tapered portions 35A and 35B are provided on the air inflow end 34 side of the rail surfaces 32A and 32B to assist the inflow of air.

In this flying type magnetic head 14, as shown in FIG. 2, the rail surfaces 32A and 32B of the facing surface 30 and the bottom surface 31A of the concave groove 31 receive the air that moves with the rotation of the magneto-optical disk 11. Buoyancy F1, F2 and F3 are generated respectively. That is, in this example, the depth h of the concave groove 31 is 5 to 5.
Since the depth is as shallow as 10 μm, buoyancy F3 is generated by receiving air even on the bottom surface 31A. Therefore, the flying height of the slider 28 is higher than that in the conventional case where the depth h of the concave groove 31 is as deep as about 500 μm.

Since the buoyancy force F3 acting on the bottom surface 31A of the concave groove 31 is smaller than the buoyancy forces F1 and F2 acting on the rail surfaces 32A and 32B on both sides, the slider 28 is indicated by a chain double-dashed line in the figure. When the roll is rolled, the restoring force G is generated and the roll is returned to the horizontal state. That is, the flying height H of the slider 28 of this example is higher than that of the conventional slider 28, and the restoring force G at the time of rolling is larger than that when the facing surface 30 is flat.

FIG. 3 shows the relationship between the depth h of the concave groove 31 and the flying height H. Here, as shown in FIG. 1, the corresponding surface 30 of the slider 28 shows an experimental result when the width W = 5 mm, the length L = 6 mm, and the width B of the concave groove 31 is constant. As can be seen from the figure, the shallower the depth h of the concave groove 31, the higher the flying height H, but the restoring force G, on the contrary, becomes smaller as the depth h becomes shallower, so the depth h is 5 to 10 μm. 2 is preferred
If it is 0 μm or less, it is practical.

On the air outflow end 33 side of the slider 28, tapered portions 37A and 37B can be provided as shown in FIG. By doing this, as shown in FIG.
Since the distance H1 between the magneto-optical disc 11 and
They are less likely to come into contact. Taper portion 37A,
37B is preferably parallel to the magneto-optical disk 11. By doing so, even if the taper portions 37A and 37B come into contact with the magneto-optical disk 11, it is possible to prevent the magneto-optical disk 11 from being scratched.

Further, the concave groove 31 of the slider 28 can be formed in various shapes as shown in FIG. 6, that is, in the present example, the shape can be narrowed on the air outflow end 33 side. by this,
The flying height H and the restoring force G of the slider 28 can be adjusted appropriately.

In the above embodiment, the rail surfaces 32A,
Although the case where 32B is a flat surface has been described, the rail surface 32
A and 32B can be cylindrical surfaces, spherical surfaces, or other curved surfaces.

[0023]

As described above, according to the present invention, the arm slidably arranged in the radial direction of the disk and the slider which is arranged at the tip of the arm and which receives the air moving as the disk rotates and floats. A flying magnetic head having a magnetic pole attached to the slider, and a displaceable holding portion interposed between the slider and the arm, a concave groove having a depth of 20 μm or less on the surface of the slider facing the disk. Are provided along the moving direction of air, and slide surfaces are provided on both sides of the concave groove.

Therefore, according to the present invention, the flying height of the slider is increased and the restoring force during rolling is also increased, so that the possibility that the air outflow end of the slider contacts the disk is reduced, and further, the slider is rolled during rolling. The side edges of the are less likely to contact the disc. by this,
It is possible to reliably prevent the disc from being scratched.

[Brief description of drawings]

FIG. 1 is a perspective view of a part of a floating magnetic head 14 according to the present invention as seen from below.

FIG. 2 shows buoyancy forces F1 to F acting on a slider 28 of the embodiment.
It is sectional drawing which shows 3 and the restoring force G.

FIG. 3 is a diagram showing a relationship between a depth h of a groove 31 and a flying height H.

FIG. 4 is a perspective view showing a first modified example of a slider 28.

FIG. 5 is a cross-sectional view showing an increment d of the flying height H1 due to the tapered portions 37A and 37B.

FIG. 6 is a perspective view showing a second modification of the slider 28.

FIG. 7 is a configuration diagram of a general magneto-optical disk device 1.

FIG. 8 is a perspective view of the floating magnetic head 14 as viewed from below.

9 is a perspective view showing the shape of a conventional slider 28. FIG.

FIG. 10 shows buoyancy forces F1 and F acting on the conventional slider 28.
It is a figure which shows 2 and the restoring force G.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 magneto-optical disk device 11 magneto-optical disk 13 optical pickup 14 floating magnetic head 15 moving part 22 load beam 24 flexure 28 slider 29 magnetic pole 30 facing surface 31 concave groove 32A, 32B rail surface 33 air outflow end 34 air inflow end 35A, 35B, 37A, 37B Tapered portion 36 Side end

Claims (3)

[Claims] 1. An arm slidably arranged in a radial direction of a disk, a slider arranged at a tip of the arm and flying by receiving air moving as the disk rotates, and a slider attached to the slider. In a flying magnetic head having a magnetic pole and a displaceable holding portion interposed between the slider and the arm, a depth of 20 μm is formed on a surface of the slider facing the disk.
A flying magnetic head, characterized in that recessed grooves of m or less are provided along the moving direction of air, and slide surfaces are provided on both sides of the recessed grooves. 2. The flying magnetic head according to claim 1, wherein the depth of the concave groove is 5 μm to 10 μm. 3. The taper is provided on the air outflow end side of the facing surface, and the taper is provided.
The flying type magnetic head described in.