JPH05314423A - Magnetic head - Google Patents

Abstract

PURPOSE:To provide a magnetic head in which further higher output characteristics can be obtained without increasing a thickness of a magnetic film for improving the output characteristics. CONSTITUTION:A magnetic head 20 has a pair of platelike magnetic elements 21, 22 connected to one another. A magnetic film 26 is formed on the element 21. A thickness of the film 26 at a position near a gap of the element 21 is a, and an angle formed between a reference line X which indicates a direction of its film thickness and a reference line Y which is extended in a longitudinal direction of the gap is theta. The thickness direction of the film indicated by the line X is decided when the film 26 is formed on the element 21. A magnetic film 27 is formed on the element 22. A thickness of the film 27 at a position near the gap of the element 22 is a, and its thickness direction of the film is the same as that of the film 26. A gap 30 is formed between an end of the film 27 and an end of the film 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to a magnetic head provided with a magnetic film near the gap.

[0002]

2. Description of the Related Art In recent years, a magnetic recording / reproducing apparatus having a large storage capacity has appeared with an increase in the amount of information to be processed, and the magnetic recording / reproducing apparatus has a high coercive force Hc in order to increase the storage capacity. A high-density recording medium made of the magnetic material has been used.

However, in the ferrite magnetic head, since the head core is made of a ferrite material, the saturation magnetic flux density is relatively small, magnetic saturation occurs in the vicinity of the gap, and a sufficient write magnetic field for the high density recording medium. I can't get strength. Therefore, instead of the conventional ferrite magnetic head, a metal in-gap head (hereinafter referred to as MIG head) is used as a magnetic head for the high density recording medium.

Next, a conventional MIG head will be described with reference to the drawings. FIG. 15 is a plan view showing a conventional MIG head, and FIG. 16 is a sectional view taken along the line CC of FIG.

The MIG head 10 is shown in FIG. 15 and FIG.
As shown in FIG. 3, a pair of plate-shaped magnetic bodies 21 and 22 are joined to each other so that a gap for defining the gap length is formed by the glass material 6. One magnetic body 21 is made of a ferrite material. The magnetic body 21 has a winding groove 23.
And an end surface 2 for defining a sliding surface with the recording medium
4 are formed. The magnetic body 21 is covered with a reaction preventive film (not shown).

The other magnetic body 22 is made of a ferrite material. The magnetic body 22 is formed with an end surface 25 for defining a sliding surface with the recording material. The magnetic body 22 is covered with a reaction preventive film (not shown).

A magnetic film 26 is formed on the joint surface of the magnetic body 21 and the magnetic body 22 to cover the joint surface. Magnetic film 26
The film thickness of the magnetic substance 21 near the gap is a, and the film thickness direction is parallel to the gap length direction.

A magnetic film 27 is formed on the joint surface of the magnetic body 22 with the magnetic body 21 to cover it. The magnetic film 27 is
The vicinity of the gap of the magnetic body 22 and the magnetic body 2 of the magnetic film 26.
The magnetic film 26 is abutted on the magnetic film 26 so that the distance between the first and the vicinity of the gap becomes equal to the gap length. Magnetic film 27
The thickness of the magnetic substance 22 in the vicinity of the gap is a, and the thickness direction thereof is the same as the thickness direction of the magnetic film 26.

An end face 28 that is substantially parallel to the film thickness direction is formed at the end of the magnetic film 26 located on the end face 24 side of the magnetic body 21, and similarly, a magnetic film 27 located on the end face 25 side of the magnetic body 22. An end surface 29 that is substantially parallel to the film thickness direction is formed at the end portion. End face 24 of magnetic body 21, end face 2 of magnetic body 22
5, end face 28 of magnetic film 26 and end face 29 of magnetic film 27
Cooperate with each other to form a sliding surface with the recording medium.

In the MIG head 10, magnetic films 26 and 27 having a high saturation magnetic flux density are formed in the vicinity of the gap 30, and the magnetic films 26 and 27 improve the write magnetic field strength.

Next, a method of manufacturing the MIG head 10 will be described with reference to the drawings. 17 to 21 are views showing a method of manufacturing the MIG head of FIG. 15, showing a first step and a fifth step thereof, respectively.

First, as shown in FIG. 17, a pair of magnetic substrate 1 made of a ferrite material and formed in a predetermined shape is prepared.

Next, as shown in FIG. 18, a winding groove is formed on one of the magnetic substrates 1, and then a reaction preventing film (not shown) is attached thereto. A reaction prevention film is attached to the other magnetic substrate (not shown).

Next, as shown in FIG. 19, a magnetic film 2 covering the surface is formed on the groove forming surface of one magnetic substrate 1, and the thickness of the magnetic film 2 is a. The other magnetic substrate 1
As shown in FIG. 20, a magnetic film 2 is formed on the end surface of the magnetic film 2 so as to cover the surface, and the thickness of the magnetic film 2 is a.

Next, as shown in FIG. 21, one end and the other end of each of the magnetic films 2 of the magnetic substrate 1 are joined by a glass material so that the magnetic films 2 are joined together by a glass material. The distance between one and the other of the two defines the length of the gap 30.

After performing a predetermined machining on the pair of ferrite substrates 1 bonded to each other, FIGS.
The MIG head 10 is obtained as shown in FIG.

In the MIG head 10, in order to further improve the output characteristics such as the write magnetic field strength, the thickness of the magnetic film 2 which is a deciding factor of the output characteristics is increased. However, when the magnetic film 2 is formed on the magnetic substrate 1, distortion occurs between the magnetic substrate 1 and the magnetic film 2. Therefore, if the film thickness a of the magnetic film 2 becomes large, the magnetic film 2 will be changed. It becomes easy to peel from 1. When the peeling of the magnetic film 2 occurs, a pseudo gap occurs and magnetostriction occurs. Further, if the film thickness of the magnetic film 2 is increased, it becomes difficult to obtain a predetermined gap length, and the yield in manufacturing deteriorates. Therefore, the film thickness a of the magnetic film 2 is suppressed to the extent that the magnetic film 2 is not peeled off from the magnetic substrate 1, and it is difficult to obtain an MIG head having higher output characteristics.

[0018]

As described above, in the conventional MIG head, the film thickness of the magnetic film for improving the output characteristics is limited, and it is difficult to obtain higher output characteristics.

In order to solve the above problems, it is an object of the present invention to provide a magnetic head capable of obtaining higher output characteristics without increasing the thickness of the magnetic film for improving the output characteristics. And

[0020]

The magnetic head of the present invention comprises:
A pair of magnetic bodies that are arranged to face each other, and a pair of magnetic bodies that are arranged to face each other. And a pair of magnetic films formed with a surface that is inclined with respect to the thickness direction that defines a sliding surface with the recording medium in cooperation with the sliding defining surface of the magnetic body.

[0021]

[Operation] The magnetic head of the present invention is a so-called MIG head in which a magnetic film is formed in the vicinity of the gap of the magnetic body, and cooperates with the sliding regulation surface of the magnetic body to form a magnetic head. A surface that defines the sliding surface and is inclined with respect to the thickness direction is formed at the end of the magnetic film. The thickness direction of the magnetic film is a direction determined when the magnetic film is formed on the magnetic body.

Since the surface formed at the end of the magnetic film is inclined with respect to the thickness direction, the dimension of the magnetic film surface exposed on the sliding surface in the inclination direction is the thickness of the magnetic film. Larger than the size. Therefore, output characteristics such as the write magnetic field strength are improved without increasing the film thickness of the magnetic film.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the magnetic head of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

A magnetic head (hereinafter referred to as "MIG") used for writing and reading information on the recording medium of the magnetic recording / reproducing apparatus.
"Head". ) 20, as shown in FIGS. 1 and 2, includes a pair of magnetic bodies 21, 22.
The two are bonded together by a glass material 6 so that a gap for defining a gap 30 is formed between them. One magnetic body 21 is made of a ferrite material. The magnetic body 21 is formed with a winding groove 23 and an end face 24 for defining a sliding surface with respect to the recording material. The magnetic body 21 is covered with a reaction preventive film (not shown).

The other magnetic body 22 is made of a ferrite material. The magnetic body 22 is formed with an end surface 25 for defining a sliding surface with the recording material. The magnetic body 22 is covered with a reaction preventive film (not shown).

A magnetic film 26 is formed on the joint surface of the magnetic body 21 and the magnetic body 22 to cover the joint surface. Magnetic film 26
The film thickness of the magnetic substance 21 in the vicinity of the gap is a, and the angle formed by the reference line X indicating the film thickness direction and the reference line Y indicating the longitudinal direction of the gap 30 is θ. The film thickness direction of the magnetic film 26 is a direction determined when the magnetic film 26 is formed on the magnetic body 21. The film thickness a of the magnetic film 26 is 6 μm or less.

A magnetic film 27 is formed on the joint surface of the magnetic body 22 with the magnetic body 21 to cover it. The magnetic film 27 is
The vicinity of the gap of the magnetic body 22 and the magnetic body 2 of the magnetic film 26.
The magnetic film 26 is abutted on the magnetic film 26 so that the distance between the first and the vicinity of the gap becomes equal to the gap length. Magnetic film 27
The thickness of the magnetic substance 22 in the vicinity of the gap is a, and the thickness direction thereof is the same as the thickness direction of the magnetic film 26.

An end surface 28 that is substantially parallel to the reference line Y is formed at the end of the magnetic film 26 located on the end surface 24 side of the magnetic body 21, and similarly, an end of the magnetic film 27 located on the end surface 25 side of the magnetic body 22. An end surface 29 that is substantially parallel to the reference line Y is formed in the portion. End face 24 of magnetic body 21, end face 2 of magnetic body 22
5, end face 28 of magnetic film 26 and end face 29 of magnetic film 27
Cooperate with each other to form a sliding surface with the recording medium.

The dimension b of the end surface 28 of the magnetic film 26 in the direction along the reference line Y is a / cos θ.
Since the dimension of the end surface 29 of the magnetic film 26 in the direction along the reference line is b, the dimension b of the end surfaces 28, 29 of the magnetic films 26, 27 exposed on the sliding surface in the direction of the reference line Y is the magnetic film. Two
Since it is larger than the thickness dimension a of 6, 27, the magnetic film 2
The output characteristics such as the write magnetic field strength are improved without increasing the film thickness of 6, 27.

By adjusting the angle θ, the thickness of the magnetic films 26 and 27 in the direction along the reference line Y can be set to a predetermined value, and the reference line Y of the magnetic films 26 and 27 can be adjusted.
The yield with respect to the thickness dimension along the direction can be improved. Further, it is possible to prevent the occurrence of the pseudo gap due to the increase in the film thickness of the magnetic films 26 and 27.

Next, a method of manufacturing the MIG head 20 will be described with reference to the drawings. 3 to 6 are shown in FIG.
FIG. 6 is a diagram showing the method of manufacturing the magnetic head of FIG.

First, two magnetic substrates 1 made of ferrite material are prepared. Next, on one magnetic substrate 1,
As shown in FIG. 3, after the shape processing is performed, a reaction preventing film (not shown) is attached, and the magnetic film 2 is formed by a thin film forming means such as sputtering. The thickness dimension of the magnetic film 2 is a. Similarly, as shown in FIG. 4, a reaction preventing film (not shown) is attached to the other magnetic body 1 after a predetermined shape processing, and the magnetic film 2 is formed by the thin film forming means. It The thickness dimension of the magnetic film 2 is a.

Next, as shown in FIG. 5, one side and the other side of the magnetic substrate 1 are joined with a glass material so that the end portions of the magnetic films 26 and 27 are spaced from each other by a predetermined distance. The gap between the end of the film 26 and the end of the magnetic film 27 defines the gap length. The pair of ferrite substrates 1 bonded to each other is cut into a rectangular shape along a predetermined cutting line (shown by a two-dot chain line in the figure). The angle formed by the reference line Y along the cutting line on the gap side of the ferrite substrate 1 and the reference line X extending in the film thickness direction of the magnetic film 2 is θ.

After cutting, a head base material 3 is obtained as shown in FIG. 6, and the head base material 3 is machined so as to form the shape shown by the chain double-dashed line in the figure. After machining, as shown in FIGS. 1 and 2, the write magnetic field strength can be improved without increasing the thickness of the magnetic film 2.
The IG head 20 is obtained.

Next, another magnetic head will be described with reference to the drawings.

FIG. 7 is a plan view showing another embodiment of the magnetic head of the present invention, and FIG. 8 is a sectional view taken along the line BB of FIG.

As shown in FIGS. 7 and 8, the MIG head 31 includes a pair of magnetic bodies 21 and 2 made of a ferrite material.
2 is provided. The magnetic bodies 21 and 22 are joined to each other by the glass material 6 so that a gap for defining the length of the gap 30 is formed. The magnetic body 21 is formed with a winding groove 23 and an end face 24 for defining a sliding surface with respect to the recording material. The magnetic body 21 is covered with a reaction preventive film (not shown).

The other magnetic body 22 is formed with an end surface 25 for defining a sliding surface with the recording material. The magnetic body 22 is covered with a reaction preventive film (not shown).

A magnetic film 26 is formed on the surface of the magnetic body 21 to be joined to the magnetic body 22 so as to cover a part of the surface. The thickness of the magnetic film 26 near the gap of the magnetic body 21 is a,
The angle formed by the reference line X1 indicating the film thickness direction and the reference line Y indicating the length direction of the gap 30 is θ. The reference line X
The film thickness direction indicated by 1 is a direction determined when the magnetic film 26 is formed on the magnetic body 21.

A magnetic film 27 is formed on the surface of the magnetic body 22 that is joined to the magnetic body 21 so as to cover a part of the surface. The magnetic film 27 is formed in the vicinity of the gap of the magnetic body 22 and the magnetic film 26.
The magnetic film 26 is abutted on the magnetic film 26 so that the gap between the magnetic substance 21 and the portion near the gap becomes equal to the gap length.
The film thickness of the magnetic film 27 in the vicinity of the gap of the magnetic body 22 is a, and the angle formed by the reference line X2 indicating the film thickness direction and the reference line Y indicating the longitudinal direction of the gap 30 is θ. The film thickness direction indicated by the reference line X2 is a direction determined when the magnetic film 27 is formed on the magnetic body 22. The butt length dimension of the magnetic film 26 and the magnetic film 27 is C.

An end surface 28 that is substantially parallel to the reference line Y is formed at the end of the magnetic film 26 located on the end surface 24 side of the magnetic body 21, and similarly, an end of the magnetic film 27 located on the end surface 25 side of the magnetic body 22. An end surface 29 that is substantially parallel to the reference line Y is formed in the portion. End face 24 of magnetic body 21, end face 2 of magnetic body 22
5, end face 28 of magnetic film 26 and end face 29 of magnetic film 27
Cooperate with each other to form a sliding surface with the recording medium.

The dimension b of the end surface 28 of the magnetic film 26 in the direction along the reference line Y is a / cos .theta.
Since the dimension of the end surface 29 of the magnetic film 26 in the direction along the reference line is b, the dimension b of the end surfaces 28, 29 of the magnetic films 26, 27 exposed on the sliding surface in the direction of the reference line Y is the magnetic film. Two
It becomes larger than the thickness dimension a of 6, 27. Therefore, the output characteristics such as the write magnetic field strength are improved without increasing the film thickness of the magnetic films 26 and 27. In addition, the magnetic film 26 and the magnetic film 2
It is known that the output characteristic is deteriorated when the butt dimension C with 7 increases, but the direction along the reference line Y of the end surfaces 28 and 29 of the magnetic films 26 and 27 exposed on the sliding surface. When the dimension b is larger than the thickness a of the magnetic films 26 and 27, the deterioration of the output characteristics due to the dimension C is prevented.

Next, a method of manufacturing the MIG head 31 will be described with reference to the drawings. 9 to 14 are views showing a method of manufacturing the magnetic head of FIG. 7, and show first to sixth steps thereof, respectively.

As shown in FIG. 9, first, two magnetic material substrates 1 made of a ferrite material are prepared. Then, as shown in FIG. 10, the end face of each ferrite substrate 1 is subjected to shape processing, and then a reaction preventing film (not shown) is attached thereto, and a magnetic film 2 is formed by a thin film forming means or the like. .. Magnetic film 2
The thickness dimension of is a.

Next, each magnetic substrate 1 on which the magnetic film 2 is formed is cut along a predetermined cutting line (shown by a two-dot chain line in the drawing) as shown in FIG. The reference line Y extending along the cutting line on the gap side of the magnetic substrate 1 and the magnetic film 2
The angle formed by the reference line X1 (X2) extending in the film thickness direction is θ.

After cutting, as shown in FIG. 12, a magnetic film 2 having a thickness b is formed on the end face of the magnetic substrate 1.
As shown in FIG. 13, the other magnetic substrate 1 is subjected to mechanical processing such as groove processing for winding, and a magnetic film 2 having a thickness b is formed on the end surface thereof.

Next, as shown in FIG. 14, one and the other of the magnetic substance substrates 1 are bonded by a glass material so that the end portions of the respective magnetic films 2 are spaced from each other by a predetermined distance, and one of the magnetic substances is The gap between the end of the film 2 and the end of the other magnetic film 2 defines the length of the gap 30. As shown in FIG. 7 and FIG. 8, the magnetic films 26 and 27 have film thicknesses by performing mechanical processing such as cutting the pair of magnetic substrates 1 bonded to each other along a predetermined cutting line. The write magnetic field strength can be improved without increasing the thickness of the magnetic film 2.
Thus, it is possible to obtain the MIG head 31 capable of preventing the deterioration of the output characteristics due to the size of the butt dimension C between the magnetic layer 6 and the magnetic film 27.

[0049]

As described above, according to the magnetic head of the present invention, higher output characteristics can be obtained without increasing the thickness of the magnetic film for improving the output characteristics.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a magnetic head of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram for explaining a first step of the method of manufacturing the magnetic head of FIG.

FIG. 4 is a diagram for explaining the second step of the method of manufacturing the magnetic head of FIG.

5A and 5B are views for explaining a third step of the method for manufacturing the magnetic head of FIG.

6A and 6B are views for explaining a fourth step of the method of manufacturing the magnetic head of FIG.

FIG. 7 is a plan view showing another embodiment of the magnetic head of the present invention.

8 is a cross-sectional view taken along the line BB of FIG.

9A and 9B are views for explaining the first step of the method for manufacturing the magnetic head of FIG.

FIG. 10 is a diagram for explaining the second step of the method of manufacturing the magnetic head of FIG.

FIG. 11 is a diagram for explaining the third step of the method for manufacturing the magnetic head of FIG.

12 is a drawing for explaining the fourth step of the method of manufacturing the magnetic head of FIG.

FIG. 13 is a diagram for explaining the fifth step of the method for manufacturing the magnetic head of FIG.

FIG. 14 is a diagram for explaining the sixth step of the method for manufacturing the magnetic head of FIG. 7.

FIG. 15 is a plan view showing a conventional magnetic head.

16 is a cross-sectional view taken along the line CC of FIG.

FIG. 17 is a diagram for explaining the first step of the method for manufacturing the magnetic head of FIG.

FIG. 18 is a drawing for explaining the second step of the method of manufacturing the magnetic head of FIG.

FIG. 19 is a drawing for explaining the third step of the method of manufacturing the magnetic head of FIG.

20 is a diagram for explaining the fourth step of the method for manufacturing the magnetic head of FIG.

FIG. 21 is a diagram for explaining the fifth step of the method for manufacturing the magnetic head of FIG.

[Explanation of symbols]

 1 Magnetic Substrate 2 Magnetic Film 20,31 Magnetic Head 21,22 Magnetic Material 24,25 Magnetic End Face 26,27 Magnetic Film 28,29 Magnetic Film End Face 30 Gap

Claims (1)

[Claims] 1. A pair of magnetic bodies facing each other, each having a sliding defining surface defining a sliding surface with respect to a recording medium, and formed on the facing surfaces of the pair of magnetic bodies facing each other, respectively. A pair of magnetic films, each end of which is formed with a surface inclined in relation to the thickness direction that defines a sliding surface with the recording medium in cooperation with the sliding defining surface of the magnetic body. A magnetic head characterized in that.