JPH07225932A - Magnetic head - Google Patents

Abstract

PURPOSE:To miniaturize a magnetic head and to accelerate increasing of a recording density. CONSTITUTION:A winding hole 11 to be provided with a pair of winding parts 10a, 10b across a magnetic gap part 12 is formed in a magnetic core 10. A sliding part 14 which is extended in a direction approximately orthogonal with these winding parts 10a, 10b and has a medium-facing surface 14a on one surface and a supporting mounting surface 14b having a height size approximately equal to the hole size of the winding hole 11 on the other surface is formed at one end of the winding hole 11 corresponding to a magnetic gap part 12 of this magnetic core 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head suitable for use in, for example, a fixed magnetic disk device (HDD).

[0002]

2. Description of the Related Art In recent years, in fixed magnetic disk devices, recording density has increased and 3.5 inch, 1 GB,
With 2.5 inches, a large capacity of 500 MB has appeared. As a recording medium of such a fixed magnetic disk, a metal magnetic medium in which a metal magnetic substance is adhered from an oxide magnetic substance coated with conventional oxide magnetic powder is used. This metal magnetic medium has a coercive force (HC) 2-3 times as high as that of the oxide magnetic medium (up to 600-1) in order to improve the recording density.
It is set to 500e), and a magnetic head capable of producing a strong recording magnetic field for magnetizing this is used.

The above magnetic head is a so-called MIG (Me
The recording ability has been improved by adding a metal magnetic film to the magnetic gap portion of an oxide magnetic core (magnetic core) called a “tal in gap” head. Then, this magnetic head is attached to a support structure via, for example, a gimbal, and is used for magnetic recording / reproduction on a medium.

FIG. 10 shows such a conventional monolithic MIG magnetic head, in which a magnetic core 1 is provided with a winding hole 1a. At one end of this winding hole 1a,
Winding 2 is applied. Further, the magnetic core 1 is provided with the metal magnetic film 3b with the magnetic gap 3a sandwiched therebetween to form the magnetic gap portion 3 (see FIG. 10B). A slider 4 is integrally formed with the magnetic core 1. A gimbal mounting surface 4a and a medium facing surface 4b are formed on the slider 4.

A method of manufacturing this magnetic head is shown in FIG.
As shown in FIG. 1, at least one surface of each of the pair of ferrite plates 41, 41 is mirror-finished, and a winding groove 42 is formed on one of the mirror-finished surfaces (see (a) and (b) of the same figure). ). And, these ferrite plates 41, 41
Is a thin film 43 of a diffusion prevention film, a metal magnetic film and a gap film, which is sequentially formed on the surface on which one winding groove 42 is formed and the opposite surface (see FIG. 11C). Overlap each other, insert a glass rod into the winding groove 42,
It is pressed and heated to adhere to form a block (see (d) of the same figure). Next, the blocked ferrite plates 41, 4
The magnetic core 1 and the slider 4 are molded as shown in FIG. 9 (e) by subjecting 1 to the processing of the tip portion, depth finishing, and track processing. After the formation, the winding 2 is applied to the winding groove portion of the winding hole 1a formed by the winding groove 42.

With the above structure, at the time of recording, the magnetic flux generated in the core leaks from the magnetic core 1 through the metal magnetic film to the outside from the magnetic gap to magnetize the recording medium arranged near the magnetic gap 3a. Record the information. On this occasion,
Since the magnetic flux density of the thin metal magnetic film is about 2 to 5 times as large as that of ferrite, the magnetic field generated from the magnetic gap is correspondingly increased, and the magnetization of the high coercive force recording medium is increased. Is realized.

However, in the magnetic head described above, due to the head structure in which the magnetic core 1 and the slider 4 are integrally formed, if the magnetic core 1 is made large to increase the recording density, the recording density will be correspondingly increased. Since the slider 4 must be made large, for example, when the gimbal 5 is attached to the gimbal attachment surface 4a of the slider 4 as shown in FIG. 12, the height dimension becomes higher than that of the magnetic core 1 and the slider becomes large in size. Have.
This problem is a major obstacle to the miniaturization of the mounted HDD.

Further, according to this, the winding 2 is provided with the winding hole 1a.
Because of the winding structure that is difficult to apply only to the winding groove part of
At the time of reproducing information from the recording medium, there is a problem that the external induction noise B is added to the magnetic field A generated in the winding portion as shown in FIG. Such a situation is not limited to the above-mentioned monolithic magnetic head, and the same applies to a bulk magnetic head including a composite type.

[0009]

As described above, the conventional magnetic head has a problem that it becomes large in size when the density is increased. The present invention has been made in view of the above circumstances, has a simple structure, can be miniaturized, and
It is an object of the present invention to provide a magnetic head capable of promoting a higher recording density.

[0010]

According to the present invention, there is provided an electromagnetic conversion element having a winding hole in which a pair of winding portions are provided with a magnetic gap portion facing a recording medium sandwiched therebetween, and the electromagnetic conversion element described above. One end of the winding hole corresponding to the magnetic gap portion is extended in a direction substantially orthogonal to the winding portion, a medium facing surface is provided on one surface, and the hole of the winding hole is provided on the other surface. A magnetic head is configured by including a slider portion provided with a support mounting surface located within a diameter.

[0011]

According to the above construction, the support mounting surface of the slider portion is positioned within the diameter of the winding hole of the magnetic core. Therefore, the mounting state in the assembled state can be made thinner, and the core efficiency can be improved.

Then, in the electromagnetic conversion element, external induction noise is applied in the opposite direction to the winding portion provided with the magnetic gap portion interposed therebetween and cancels each other. Therefore, external induction noise can be reduced and the S / N ratio can be improved.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a magnetic head according to an embodiment of the present invention. A magnetic core 10 forming an electromagnetic conversion element is provided with, for example, a rectangular winding hole 11. A magnetic gap portion 12 is provided on one side of the winding hole 11 of the magnetic core 10. Magnetic gap 12
1 is formed of a magnetic gap 12a and a metal magnetic film 12b (see FIG. 1 (b) 9 and is arranged to face a recording medium (not shown). Further, both sides of the winding hole 11 sandwiching the magnetic gap portion 12 of the magnetic core 10 are disposed. Includes a pair of winding parts 10a, 10b
2, the winding portions 10a and 10b are provided with a winding 13 as shown in FIG. 2, and the winding 13 is connected to an internal device (not shown).

On the opposite side of the winding hole 11 of the magnetic core 10 facing the magnetic gap portion 12, a slider portion 14 is provided at one end of the winding hole 11 in a direction substantially orthogonal to the winding portions 10a and 10b. It will be extended. A medium facing surface 14a called a ski is provided on one surface of the slider portion 14, and a support mounting surface 14b having a height dimension substantially similar to the hole diameter of the winding hole 11 is provided on the other surface thereof. Then, as shown in FIG. 2, for example, a cymbal 15 is provided on the support mounting surface 14b.
Is attached, and the gimbal 15 is supported by a support structure (not shown).

Next, a method of manufacturing the above magnetic head will be described. That is, as shown in FIGS. 3A and 3B, first,
A pair of ferrite plates 20, 20 is prepared, and at least one surface of each is mirror-finished, and concave winding grooves 21, 21 and track grooves 22, 22 are formed correspondingly on the processed surfaces. And these ferrite plates 20, 2
On the processed surface of the winding grooves 21 and 21 of 0 and the track grooves 22 and 22, a thin film 2 of a diffusion prevention film, a metal magnetic film and a non-magnetic film 2 is formed.
3 is sequentially formed into a thin film, and the thin film forming surfaces are overlapped with each other,
A glass rod is inserted into the winding grooves 21 and 21 and heated and pressed to bond them to form a block (see FIGS. 3C and 3D). Next, after slicing this block-shaped ferrite plate perpendicularly to its abutting surface so that the position of the track will later become the medium facing surface (see FIG. 3 (e)), depth finishing, track processing, etc. To form the magnetic core 10 and the slider portion 14 ((f) in the figure,
(See (g)). Here, the support mounting surface 1 of the slider portion 14
4b has a height H and a length L, which are substantially the same as the diameter of the winding hole 11.

As described above, in the above magnetic head, the pair of winding portions 10 sandwich the magnetic gap portion 12 in the magnetic core 10.
A winding hole 11 in which a and 10b are provided is formed, and the winding hole 11 corresponding to the magnetic gap portion 12 of the magnetic core 10 is formed.
Has a medium facing surface 14a on one side and a height dimension substantially the same as the hole diameter of the winding hole 11 on one side. The slide portion 14 having the support mounting surface 14b is formed.

According to this, since the support mounting surface 14b of the slider portion 14 is provided with a height dimension substantially similar to the hole diameter of the winding hole 11 of the magnetic core 10, as shown in FIG. Can be maintained at a height substantially equal to the height of the magnetic core 10 in a state of being mounted on the support mounting surface 14b of the slider portion 14, and can be made thinner than the conventional type shown in FIG. Miniaturization is easily realized.

Further, according to this, as shown in FIG. 5, external induction noise B added at the time of recording is similarly applied to the pair of winding portions 10a and 10b provided with the magnetic gap portion 12 interposed therebetween. As a result, the noises imparted to each other are canceled, the influence of the external induction noise B on the magnetic field A of the magnetic core 10 can be reduced, and the S / N ratio can be improved.

The present invention is not limited to the above-described embodiment but can be applied to the head structure shown in FIGS. 6 to 9, and the same effect can be expected in any head structure. However, the same reference numerals are given to the same parts in the drawings, and the description thereof will be omitted.

6 and 7 show a slider having a magnetic core 33 having a winding hole 32 in which winding portions 31 and 31 are provided with a magnetic gap 30 sandwiched between them, a medium facing surface 34 and a support mounting surface 35. This is a so-called composite type head structure in which the part 36 is formed separately and the magnetic core 33 and the slider part 36 are molded by glass bonding, for example.

FIG. 8 shows a head structure having a magnetic core 38 in which a track is formed with a magnetic gap portion 37 from the edge of the magnetic core 10 by a predetermined width and the lateral portion of the track is filled with glass 37a. Is.

In FIG. 9, the electromagnetic conversion element portion is formed by using a laminated film in which a metal magnetic film and an insulating film are laminated once or a plurality of times as a main core, and the core 39 and the slider portion 40 in which the laminated film is formed are not formed. It has a so-called laminated head structure formed of a magnetic material. In this case, the magnetic gap portion 41 is formed by the magnetic gap 42 and the metal magnetic film / insulating film laminated core 43. In addition, this laminate head structure can be applied to a composite type structure as described above.

In the above embodiment, the slider portion 14,
The support mounting surfaces 14b and 35 of 36 and 40 are attached to the magnetic core 10,
Although the description has been given of the case where the height dimensions of the winding holes 11 and 32 of 33, 38 and 39 are substantially the same as those of the winding holes 11 and 32,
Without being limited to this, the height dimensions of the support mounting surfaces 14b and 35 may be further positioned in the medium direction.
Further, as the height dimension of the support mounting surfaces 14b and 36,
By arranging the winding holes 11 and 32 so that they are positioned within the hole diameters, substantially the same effect is expected.

Furthermore, in the above-mentioned embodiment, the case of application to a gimbal support structure has been described, but the present invention is not limited to this and can be applied to various support structures.
Therefore, the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

[0025]

As described above in detail, according to the present invention, a magnetic head having a simple structure, a small size, and a high recording density can be provided. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a magnetic head according to an embodiment of the invention.

FIG. 2 is a view showing a mounted state of the gimbal of FIG.

FIG. 3 is a diagram showing the manufacturing process of FIG. 1;

FIG. 4 is a diagram shown for explaining the effect of FIG.

FIG. 5 is a diagram shown to explain the effect of FIG. 1;

FIG. 6 is a diagram showing another embodiment of the present invention.

FIG. 7 is a view showing an assembled state of FIG.

FIG. 8 is a diagram showing another embodiment of the present invention.

FIG. 9 is a diagram showing another embodiment of the present invention.

FIG. 10 is a diagram showing a conventional magnetic head.

FIG. 11 is a diagram showing the manufacturing process of FIG. 10;

FIG. 12 is a diagram shown for explaining a conventional problem.

FIG. 13 is a diagram shown for explaining a conventional problem.

[Explanation of symbols]

 10, 33 ... Magnetic core. 11, 32 ... Winding holes. 12, 30, 37, 41 ... Magnetic gap portion. 12a, 42 ... Magnetic gap. 12b ... Metal magnetic film. 10a, 10b, 31 ... Winding part. 14, 36, 40 ... Slider section. 15 ... Gimbal. 20 ... Ferrite plate. 21 ... Winding groove. 22 ... Track groove. 23 ... Thin film. 37a ... glass. 39 ... Core. 43 ... Metal magnetic film / insulating film laminated core.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Ota 33 Shinisogocho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture

Claims (2)

[Claims] 1. An electromagnetic conversion element having a winding hole in which a pair of winding portions are provided sandwiching a magnetic gap portion facing a recording medium, and a winding corresponding to the magnetic gap portion of the electromagnetic conversion element. One end of the hole is extended in a direction substantially orthogonal to the winding part, a medium facing surface is provided on one surface, and a support mounting surface located on the other surface within the hole diameter of the winding hole. A magnetic head having a slider portion provided with. 2. The magnetic head according to claim 1, wherein the support mounting surface of the slide portion is provided so as to be located in the medium direction with respect to the hole diameter of the winding hole.