JPH09305910A - Magnetic head and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve output of a magnetic head by forming a half core with a thin film to shorten a magnetic path. SOLUTION: A wiring groove 2 and a depth groove are formed at a contact surface between a first half core 101 as a magnetic core and a second half core 102 as a non-magnetic core to be coupled. Next, a core thin film portion 3 is evaporated through sputtering by a magnetic substance to the coupling surface of the second half core 102 where the wiring groove 2 and depth groove are formed. Next, gap is sputtered with silicon dioxide to form a magnetic head gap 5 on the core thin film portion 3 and the second half core 102 and the first half core 101 are welded by glass after the above gap sputtering process. Next, the contact surface which is the sliding surface of the welded second half core 102 and first half core 101 is polished by the rounding polishing method and the side surface of the first half core 101 polished by the rounding polishing method is then polished.

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 a method for manufacturing the same, and more specifically, to improve the output of the magnetic head by depositing a magnetic substance on a non-magnetic core to shorten the magnetic path. The present invention relates to such a magnetic head and a manufacturing method thereof.

[0002]

2. Description of the Related Art Generally, in magnetic recording devices, high saturation is accelerated, and at the same time, increasing the amount of recorded information per unit area of a medium, that is, increasing the recording density is a core improvement task. The development of the magnetic recording will have a great influence on the improvement of the medium performance of magnetic tapes and disks. With the progress of the medium technology such as the increase of the coercive force of the magnetic material, the magnetic recording of the magnetic head which plays a leading role in recording and reproduction. And improvement of reproduction sensitivity and output improvement are the most important issues for realizing high density.

FIG. 7 is a structural diagram of a conventional magnetic head. The magnetic head according to the prior art shown in FIG. 7 has a pair of first half cores (101) made of manganese zinc ferrite.
And a coil is wound around the second half core (102), and when a signal current flows through this coil, a magnetic flux is generated in the first half core (101) and the second half core (102). However, the manufacture of such a conventional magnetic head requires winding groove (2),
It has been performed through the steps of depth groove, gap sputter, core bonding and welding, rounding polishing and slicing.

[0004]

In the above process, the shorter the average magnetic path length (4), the better the efficiency of the head.
The head output can be increased, but the core width should be reduced to shorten the magnetic path. On the other hand, the winding groove (2) requires a space for winding the coil at least about 20 times. Therefore, if the width of the core is small, the winding groove (2) may be damaged or cracked when the coil is wound due to residual stress. Since there is a limit to downsizing the width of the core, there is a problem that the magnetic head cannot be downsized.

Therefore, the present invention has been devised to solve the above-mentioned conventional problems, and the main object of the present invention is to shorten the magnetic path and increase the output of the magnetic head.
It is an object of the present invention to provide a magnetic head having a reduced size and a method for manufacturing the same.

[0006]

In order to achieve the above-mentioned object, a feature of the first invention according to claim 1 is that a nonmagnetic core is joined to a first half core which is a magnetic core. The step of forming the winding groove and the depth groove on the joint surface of the half core, and the core thin film part is sputtered with a magnetic substance on the joint surface of the second half core on which the winding groove and the depth groove are formed. And vapor deposition, and gap sputtering so that a thin film that is a magnetic head gap is formed on the core thin film portion,
A step of welding the first half core and the second half core with glass after the above step, and the above-mentioned welded first half core and the second half core
It is manufactured by a rounding polishing step of polishing the contact surface of the half core, a step of polishing the side surface of the first half core after the rounding polishing step, and a step of slicing the magnetic head. The main point is that. Therefore, the magnetic path can be shortened, the output of the magnetic head can be increased, and the size of the magnetic head can be reduced.

A second aspect of the present invention is characterized in that the core thin film portion is vapor-deposited with a magnetic substance such as manganese zinc or sendust. Therefore, the magnetic core thin film portion can be deposited.

A third aspect of the present invention is characterized in that the core thin film portion has a thin film thickness of 2 μm to 50 μm. Therefore, the thin film of the core thin film portion can maintain the strength of the thin film and prevent cracking and damage due to residual stress.

According to a fourth aspect of the present invention, the second non-magnetic core is joined to the first half core which is the non-magnetic core.
A step of forming a winding groove and a depth groove on the joining surface of the half core, and a joining surface of the joining surface of the first half core and the second half core on which the winding groove and the depth groove are formed And a step of depositing a first core thin film portion and a second core thin film portion by sputtering with a magnetic material, and gap sputtering so that a thin film that is a magnetic head gap is formed on the second core thin film portion. A step, a step in which the first half core and the second half core are welded by glass after the above step, and a lounger in which a contact surface of the welded first half core and the second half core is polished The gist of the present invention is to include a polishing step, a step of polishing the side surface of the first half core after the rounding step, and a step of slicing the magnetic head. Therefore, the magnetic path can be remarkably shortened by the magnetic flux flowing through the first core thin film portion and the second core thin film portion.

A fifth aspect of the present invention is characterized in that the core thin film portion is vapor-deposited with a magnetic substance such as manganese zinc or sendust. Therefore, the magnetic core thin film portion can be deposited.

A sixth aspect of the present invention is characterized in that the core thin film portion has a thin film thickness of 2 μm to 50 μm. Therefore, the thin film of the core thin film portion can maintain the strength of the thin film and prevent cracking and damage due to residual stress.

According to a seventh aspect of the present invention, in a magnetic head formed by joining a first half core and a second half core,
The first half core, which is a magnetic core, and the second half, which is a non-magnetic core
A core thin film portion formed by sputtering a magnetic substance on the joint surface of the half core and the second half core which is the non-magnetic core, and silicon oxide formed by gap sputtering on the core thin film portion. The gist is that it is composed of a thin film that is a film. Therefore, the magnetic path can be shortened, the output of the magnetic head can be increased, and the size of the magnetic head can be reduced.

An eighth aspect of the present invention is characterized in that the magnetic substance is manganese zinc ferrite or sendust. Therefore, the magnetic core thin film portion can be deposited.

A ninth aspect of the present invention is summarized in that the nonmagnetic core is nickel zinc ferrite or AlTiC. Therefore, it has a hardness similar to that of manganese zinc ferrite.

A tenth aspect of the present invention is characterized in that the width of the first half core is about 1/3 or less of the thickness of the first half core. Therefore, the shortening of the magnetic path can be optimized.

According to an eleventh aspect of the present invention, in a magnetic head formed by joining a first half core and a second half core, the first half core which is a non-magnetic core and the non-magnetic core are used. A second half core, a first core thin film portion sputtered with a magnetic substance on a bonding surface of the first half core where the first half core and the second half core are bonded, and the first half A second core thin film portion sputtered with a magnetic material on a joint surface of the second half core where the body core and the second half core are joined, and gap sputtering is formed on the second core thin film portion. The main point is that it consists of a thin film. Therefore, the magnetic path can be remarkably shortened by the magnetic flux flowing through the first core thin film portion and the second core thin film portion.

A twelfth aspect of the present invention is characterized in that the magnetic substance is manganese zinc ferrite or sendust. Therefore, the magnetic core thin film portion can be deposited.

A thirteenth aspect of the present invention is characterized in that the nonmagnetic core is nickel zinc ferrite or AlTiC. Therefore, it has a hardness similar to that of manganese zinc ferrite.

A fourteenth aspect of the present invention is characterized in that the width of the first half core is about ⅓ or less of the thickness of the first half core. Therefore, the shortening of the magnetic path can be optimized.

[0020]

1 is a process diagram showing a method of manufacturing a magnetic head according to the present invention. A magnetic head and a method for manufacturing the same according to the present invention include a first half core (a magnetic core forming a magnetic head). The second, which is a non-magnetic core joined to 101)
Step (A) in which the winding groove (2) and the depth groove are formed on the joint surface of the half core (102), and the second half core in which the winding groove (2) and the depth groove are formed. A step (B) in which the core thin film part (3) is sputtered with a magnetic substance and deposited on the bonding surface of the (102), and a magnetic head gap (5) is formed on the core thin film part (3). A gap sputtering step (C) of sputtering with silicon oxide, and a step (D) of welding the second half core (102) and the first half core (101) with glass after the gap sputtering step. The welded second half core (10
2) and a rounding polishing step (E) in which a contact surface which is a sliding surface of the first half core (101) is polished, and a side surface of the first half core (101) subjected to the rounding polishing step. Is polished and the magnetic head is sliced (F).

In the above manufacturing method, the second half core (102) which is a non-magnetic core is the first half core (10) which is a magnetic core.
The magnetic core thin film part (3) is deposited by sputtering a manganese-zinc material, which is a magnetic material, on the bonding surface to be bonded with 1). It is desirable that the thin film of the core thin film portion (3) has a thickness of 2 μm to 50 μm in order to maintain the strength of the thin film and prevent cracking and damage due to residual stress.

The core sputtering for forming the core thin film part (3) on the second half core (102) which is a non-magnetic core made of Al _{2 2} O ₃ and Ca-based oxide (Oxide) is a magnetic substance. Manganese Zinc Ferrite or Fe-Si-A
It is composed of sendust which is an alloy of 10 ³ to
It is formed by sputtering in an Ar atmosphere of rr.

In addition, the first half core (1
01) is made of conventional bulk manganese zinc ferrite, and is the non-magnetic core of the second half core (102).
Is a non-magnetic nickel zinc ferrite or AlTiC having a hardness similar to that of manganese zinc ferrite.

FIG. 2 is a plan view of the magnetic head according to the present invention, and FIG. 3 is a sectional view taken along the line III--III in FIG.

The magnetic head according to the present invention as shown in FIG.
The first half core (101) which is a magnetic core, the second half core (102) which is a non-magnetic core, and the second half core (102) which is a non-magnetic core are bonded to each other with a magnetic substance. A core thin film portion (3) formed by sputtering, a magnetic head gap (5) and a second half core (102) formed by gap sputtering of silicon oxide on the core thin film portion (3), First half core (1
01) is welded, and the core thin film part (3) deposited on the second half core (102) which is the non-magnetic core and the first half core (101) which is the magnetic core are short. Magnetic path
(4a) is formed.

Therefore, in the magnetic head according to the present invention, when the second half core (102) is used, the magnetic flux can pass through the second half core (102) which is a non-magnetic core without using the magnetic core. The magnetic core thin film part (3) is formed on the core and the magnetic flux does not pass through the second half core (102).
Since it flows through (3), the magnetic path (4a) is remarkably shortened.
Is formed.

FIG. 4 is a plan view of a magnetic head according to another embodiment of the present invention, FIG. 5 is a sectional view taken along line VV in FIG. 4, and FIG. 6 is a magnetic view of another embodiment of the present invention. FIG. 6 is a process diagram showing a manufacturing process of the head.

FIG. 9 is a process diagram showing a magnetic head manufacturing method of another embodiment according to the present invention in FIG. 6. In the figure, the first
The magnetic head in which the half core (101) and the second half core (102) are joined together has a first half core (101) which is a non-magnetic core,
The magnetic flux is applied to the joint surface of the second half core (102) which is a non-magnetic core and the first half core (101) where the first half core (101) and the second half core (102) are joined. The second core (102) in which the first core thin film part (3a) sputtered with a magnetic material so that the first half core (101) and the second half core (102) are joined to each other ) The second core thin film portion (3b) sputtered with a magnetic substance so that the magnetic flux can pass to the joint surface of
The magnetic head gap (5) is a thin film formed by gap sputtering with silicon oxide on the core thin film portion (3b). In the above magnetic head, since magnetic flux flows through the first core thin film portion (3a) and the second core thin film portion (3b), a magnetic path (4a ') which is remarkably shortened is formed.

The magnetic head according to the present invention manufactured as described above and the method for manufacturing the same are intended to reduce the core cross-sectional area by reducing the core width (in FIG. 1, the core width reduced by side polishing). As a result, the output decreases and the magnetic path (4a) in FIG. 3 and the magnetic path (4a ′) in FIG. 6 become shorter than the magnetic path (4) in FIG. 7, and the output of the magnetic head increases. , The output reduction due to the reduction of the core width at this time is the core
By increasing the thickness of the core (which is the thickness of the core in the winding groove direction) and suppressing the decrease in the core cross-sectional area, the output increasing efficiency due to the shortening of the magnetic path can be maximized.

Further, in the magnetic head and the method for manufacturing the same according to the present invention, in the reduction of the core cross-sectional area as described above, the width of the core is preferably about 1/3 or less than the thickness of the core, and the optimum magnetic path shortening is achieved. It has a feature that can be realized.

[0031]

As described above, according to the first invention, the winding groove and the depth are formed on the joint surface of the second half core which is the non-magnetic core and which is joined to the first half core which is the magnetic core. A step of forming a groove, a step of depositing a core thin film portion by sputtering a magnetic material on a bonding surface of the second half core in which the winding groove and the depth groove are formed, and a step of forming the core thin film portion. A step of gap sputtering to form a thin film of a magnetic head gap thereon; a step of welding the first half core and the second half core with glass after the above step; A rounding polishing step of polishing the contact surface between the first half core and the second half core, a step of polishing the side surface of the first half core after the rounding polishing step, and a slicing of the magnetic head. Since it is manufactured from the process of Increasing the output of the de, it is possible to reduce the size of the magnetic head.

In the second aspect of the invention, the core thin film portion can be deposited because the core thin film portion is deposited with a magnetic substance such as manganese zinc or sendust.

In the third invention, the core thin film portion has a thickness of 2 μm to 50 μm, so that the thin film of the core thin film portion can maintain strength of the thin film and prevent cracks and damages due to residual stress.

A fourth invention is a step of forming a winding groove and a depth groove on a joint surface of a second half core which is a non-magnetic core joined to a first half core which is a non-magnetic core. , The first core thin film portion and the second core thin film portion are sputtered with a magnetic substance and deposited on the joint surface of the first half core and the joint surface of the second half core on which the winding groove and the depth groove are formed. And a step of performing gap sputtering so that a thin film which is a magnetic head gap is formed on the second core thin film portion, and the first half core and the second half core are made of glass after the above step. Of the first half core and the rounding polishing step of polishing the contact surfaces of the welded first half core and the second half core, and after the rounding polishing step, Since it consists of the step of polishing the side surface and the step of slicing the magnetic head, Magnetic path by the magnetic flux flows through the core thin film portion and the second core thin section can be remarkably shortened.

In the fifth aspect of the invention, the core thin film portion can be deposited because the core thin film portion is deposited with a magnetic substance such as manganese zinc or sendust.

In the sixth invention, the core thin film portion has a thickness of 2 μm to 50 μm, so that the thin film of the core thin film portion can maintain strength of the thin film and prevent cracks and damages due to residual stress.

According to a seventh aspect of the invention, in a magnetic head formed by joining a first half core and a second half core, a first half core which is a magnetic core and a second half core which is a non-magnetic core. A core thin film portion formed by sputtering a magnetic substance on the bonding surface of the second half core which is the non-magnetic core, and a silicon oxide film formed by gap sputtering on the core thin film portion. Since it is made of a thin film, the magnetic path can be shortened, the output of the magnetic head can be increased, and the size of the magnetic head can be reduced.

In the eighth invention, since the magnetic substance is manganese zinc ferrite or sendust, the magnetic core thin film portion can be deposited.

In the ninth invention, since the nonmagnetic core is nickel zinc ferrite or AlTiC, it has a hardness similar to that of manganese zinc ferrite.

In the tenth aspect of the invention, the width of the first half core is about 1/3 or less of the thickness of the first half core, so that the shortening of the magnetic path can be optimized.

An eleventh invention is a magnetic head in which a first half core and a second half core are joined, and a first half core which is a non-magnetic core and a second half body which is a non-magnetic core. A core and a first half core to which the first half core and the second half core are joined
The first core thin film portion sputtered with a magnetic substance on the joint surface of the half core and the joint surface of the second half core with which the first half core and the second half core are joined are sputtered with a magnetic substance. Since the second core thin film portion and the thin film formed by gap sputtering on the second core thin film portion are formed, the magnetic path is formed by the magnetic flux flowing through the first core thin film portion and the second core thin film portion. It can be shortened epoch-making.

In the twelfth aspect of the invention, since the magnetic substance is manganese zinc ferrite or sendust, the magnetic core thin film portion can be deposited.

In the thirteenth invention, since the nonmagnetic core is nickel zinc ferrite or AlTiC, it has a hardness similar to that of manganese zinc ferrite.

In the fourteenth aspect of the invention, the width of the first half core is about 1/3 or less of the thickness of the first half core, so that the magnetic path can be optimized.

[Brief description of drawings]

FIG. 1 is a process drawing showing a manufacturing process of a magnetic head according to the present invention.

FIG. 2 is a plan view of a magnetic head according to the present invention.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view of a magnetic head according to another embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a process diagram showing a manufacturing process of a magnetic head according to another embodiment of the present invention.

FIG. 7 is a structural diagram of a conventional magnetic head.

[Description of Reference Signs] 2 winding groove 3 core thin film portion 3a first core thin film portion 3b second core thin film portion 4a magnetic path 5 magnetic head gap 101 first half core 102 second half core

Claims (14)

[Claims] 1. A step of forming a winding groove and a depth groove on a joining surface of a second half core which is a non-magnetic core joined to a first half core which is a magnetic core, and the winding groove. And a step of depositing a core thin film portion with a magnetic material on the joining surface of the second half core having the depth groove formed therein, and a step of gap sputtering so that a thin film is formed on the core thin film portion. A step of welding the second half core and the first half core with glass after the above step, and rounding polishing for polishing the contact surface of the welded second half core and the first half core And a step of polishing the side surface of the first half core after the rounding polishing step; and a method of manufacturing a magnetic head by slicing the magnetic head. 2. The method of manufacturing a magnetic head according to claim 1, wherein the core thin film portion is deposited with a magnetic substance such as manganese zinc or sendust. 3. The core thin film portion has a thin film thickness of 2 μm.
The method of manufacturing a magnetic head according to claim 1, wherein the thickness is from m to 50 μm. 4. A step of forming a winding groove and a depth groove on a joint surface of a second half core which is a non-magnetic core joined to a first half core which is a non-magnetic core, and the above winding. A step of depositing a first core thin film portion and a second core thin film portion with a magnetic material on the joint surface of the second half core and the joint surface of the first half core in which the groove and the depth groove are formed; A step of gap sputtering so that a thin film is formed on the two-core thin film part, a step of welding the second half core and the first half core with glass after the above step, and the step of welding the above A rounding polishing step in which the contact surface between the second half core and the first half core is polished, a step in which the side surface of the first half core is polished after the rounding polishing step, and a magnetic head is sliced. A method of manufacturing a magnetic head, which is manufactured by the following method. 5. The method of manufacturing a magnetic head according to claim 4, wherein the core thin film portion is deposited with a magnetic substance such as manganese zinc or sendust. 6. The core thin film portion has a thin film thickness of 2 μm.
The method of manufacturing a magnetic head according to claim 4, wherein the thickness is from m to 50 μm. 7. A magnetic head comprising a second half core and a first half core joined together, the first half core being a magnetic core, the second half core being a non-magnetic core, and the non-magnetic core. A magnetic film, comprising: a core thin film portion formed by sputtering a magnetic substance on a bonding surface of a second half core, which is a magnetic core; and a thin film formed by gap sputtering on the core thin film portion. head. 8. The magnetic head according to claim 7, wherein the magnetic substance is manganese zinc ferrite or sendust. 9. The magnetic head according to claim 7, wherein the non-magnetic core is nickel zinc ferrite or AlTiC. 10. The magnetic head according to claim 7, wherein the width of the first half core is about ⅓ or less of the thickness of the first half core. 11. A magnetic head comprising a second half core and a first half core joined together, wherein the first half core is a non-magnetic core, the second half core is a non-magnetic core, and The first core thin film portion sputtered with a magnetic substance is formed on the bonding surface of the first half core where the first half core and the second half core are bonded, and the first half core and the second half core are A second core thin film portion sputtered with a magnetic substance on the joint surface of the second half core to be joined, and a thin film formed by gap sputtering on the second core thin film portion. Magnetic head. 12. The magnetic material according to claim 11, wherein the magnetic material is manganese zinc ferrite or sendust.
The magnetic head as described. 13. The non-magnetic core is nickel zinc ferrite or AlTiC.
1. The magnetic head according to 1. 14. The magnetic head according to claim 11, wherein the width of the first half core is about 1/3 or less of the thickness of the first half core.