JPH07129911A - Magnetic head and manufacturing method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] In a magnetic head having a structure in which the main magnetic path is formed by laminating a soft magnetic alloy thin film and an insulating film and sandwiching them with a non-magnetic substrate, the glass melted in the winding groove is in a good state in a narrow gap head. In addition, since the eddy current loss occurs in the Cr film formed in the winding groove portion and the side surface of the chip and the high frequency characteristics are deteriorated, a magnetic head and a method for manufacturing the same can be realized. [Structure] An insulating film 5 (for example, a SiO ₂ film) is formed in a winding groove portion 4 of a magnetic head whose main magnetic path is composed of a soft magnetic alloy thin film 1 and an insulating film 2 and which is sandwiched between nonmagnetic substrates 3. , A magnetic head in which the gap material 6 is deposited and the glass 7 is melted and joined. Alternatively, in a magnetic head having a structure in which a soft magnetic alloy thin film and an insulating film are laminated and sandwiched between non-magnetic substrates, glass is placed on the insulating film and the Cr film formed in the winding groove portion, and a gap material is formed. Bonded magnetic head.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a VTR (video tape re
The present invention relates to a magnetic head used for corder), DAT (dynamic address translation), etc., and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, with the trend of magnetic recording technology demanding characteristics in a high frequency region of a video head or the like, there is a demand for a magnetic head and a recording medium which can sufficiently cope with a recording wavelength of submicron. Under such circumstances, a magnetic head is a recording medium with a high coercive force (Hc) (for example, metal,
In order to perform sufficient writing in the Ba-Fe tape), the saturation magnetic flux density (B
A magnetic head of a laminated type having a main magnetic path formed of a soft magnetic alloy thin film having a high s) (for example, sendust, an amorphous material) has been developed, and some have been put into practical use for S-VHS, commercial D- VT
It is installed for R and so on.

A conventional magnetic head will be described below with reference to the drawings. FIG. 6 is a view showing a laminated magnetic head, which has a structure in which a soft magnetic alloy thin film 30 and an insulating film 31 are laminated and sandwiched by a non-magnetic substrate 32, and a pair is wound around at least one of the core halves to be the magnetic head. A line groove 33 is formed, the gap surface is mirror-polished, and then bonded through a gap material 34, and the glass 35 has a structure in which the bonding strength is increased. Further, the manufacturing method is as shown in FIG.
And the insulating film 37 are laminated, and a winding groove 39 is formed on at least one of the core halves with both sides sandwiched by the non-magnetic substrate 38, the gap surface is mirror-polished, and then butt-joined via the gap material 40. At the same time, the glass 41 is melted in the winding groove.

[0004]

However, in the above-described conventional structure and manufacturing method, in the laminated magnetic head having a narrow gap length (0.2 μm in the D-VTR for professional use), the glass melting surface has the ceramic and the metal film. Since it is composed of, there is unevenness in the melting method of the glass that melts in the winding groove, and when it is used as a head chip, there is no glass and the strength is insufficient,
There was a problem that the space of the winding could not be secured due to the dango shape. The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a highly reliable magnetic head and a manufacturing method thereof.

[0005]

In order to achieve the above object, in the magnetic head of the present invention, when the glass mold is formed at the time of forming the gap, the influence of the soft magnetic alloy thin film of the underlying layer on the winding groove portion causes the wetting of the glass. An insulating film is formed to the extent that it does not affect As a method of molding the glass before the gap bonding, an insulating film and a Cr film are formed in the winding groove portion to melt the glass, and the winding space is later removed by grinding or the like to secure the glass. The bonding is performed through the gap material.

[0006]

With this structure and manufacturing method, the glass can be melted without being affected by the underlying layer, and the glass is molded before forming the gap, in which the insulating film and the Cr film are formed in the winding groove. By forming a film on both sides, the wettability of the glass is improved, and it becomes possible to mold the winding groove in a good state, so that the adhesive strength is excellent and the laminated film on the side surface of the core does not short-circuit. Therefore, a magnetic head having excellent high frequency characteristics can be obtained without causing a loss due to an eddy current.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head according to a first embodiment of the present invention will be described below with reference to FIG. In FIG. 1, an insulating film 5 is formed in a groove portion where a winding groove 4 is formed in at least one of a pair of core halves having a structure in which a soft magnetic alloy thin film 1 and an insulating film 2 are laminated and sandwiched by a non-magnetic substrate 3. Gap material 6
The butt glass 7 is melted and joined via the.

Next, a second embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. Figure 2 (a) shows the soft magnetic alloy thin film 8
The insulating film 9 and the insulating film 9 are laminated, the winding groove 11 is formed in the core half sandwiched by the non-magnetic substrate 10, and then the insulating film (SiO ₂ or the like) 12 is formed. Further, FIG. 2B shows a core half body in which the gap member 13 is formed after the gap abutting surface is mirror-polished. Further, FIG. 2 (c) shows a core block in which the gap surfaces of a pair of core halves are butted and the glass 14 is melted and joined.

Next, a magnetic head according to a third embodiment of the present invention will be described with reference to FIG. In FIG.
The soft magnetic alloy thin film 15 and the insulating film 16 are laminated to form a non-magnetic substrate 17
The insulating film 19 and the Cr film 20 are formed in the groove portion where the winding groove 18 is formed on at least one of the pair of core halves having the structure sandwiched by It is joined.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. In FIG. 4A, an insulating film (such as SiO ₂ ) 24 and a Cr film 25 are formed on a gap surface including a winding groove 23 of a core half having the same structure as that of the second embodiment, and then a glass 26 is formed. It is melted. Further, FIG. 4 (b) shows a case where the gap surface is polished and the winding space 27 is secured by grinding or the like. Further, FIG. 4C is a core half body in which the gap material 28 is formed. Further, FIG. 4D shows a core block in which the gap surfaces are butted, the glass 29 is melted, and the gap is joined.

FIG. 5 is an example showing the effect relating to the magnetic characteristics of the above-mentioned invention. The magnetic permeability of the head is 1 MHz in the conventional example.
Although it sharply decreases in the vicinity, the present invention shows a high value up to a high frequency region. Also, the head output is 30
There was a 2-3 dB difference in MHz.

[0012]

As described above, according to the present invention, when the glass is molded at the time of forming the gap, the insulating film is formed in the winding groove portion to the extent that the effect of the soft magnetic alloy thin film as the base does not affect the wetting of the glass. Glass and mold the glass before gap bonding.
As for the material to be welded, since the insulating film and the Cr film are formed in the winding groove portion and then melted, both the wettability of the glass is improved, and the winding groove can be molded in a good state. Since the adhesive strength is excellent and the laminated films are not short-circuited, loss due to eddy current does not occur, and a magnetic head excellent in high frequency characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is an external view of a head core according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention after forming a base film,
It is an external view of a head core and the like at the time of forming a gap film and at the time of gap bonding.

FIG. 3 is an external view of a head core according to a third embodiment of the present invention.

FIG. 4 is an external view of a head core at the time of forming a gap film, a head core at the time of gap bonding after processing a winding space after molding a glass in a fourth embodiment of the present invention.

FIG. 5 is a diagram showing an effect relating to magnetic characteristics of the present invention.

FIG. 6 is an external view of a conventional magnetic head.

FIG. 7 is an external view of a conventional magnetic head during formation of a gap film and before formation of a gap.

[Explanation of symbols]

1, 8, 15, 30, 36 ... Soft magnetic alloy thin film, 2, 5, 9,
12, 16, 19, 24, 31, 37 ... Insulating film, 3, 10, 17, 32,
38 ... Non-magnetic substrate, 4, 11, 18, 23, 33, 39 ... Winding groove,
6,13,22,28,34,40 ... Gap material, 7,14,2
1, 26, 29, 35, 41 ... Glass, 20, 25 ... Cr film.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Yoda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. In a laminated magnetic head having a structure in which a main magnetic path is composed of a soft magnetic alloy thin film and an insulating film, and both side surfaces are sandwiched by non-magnetic substrates, an insulating film is formed on at least one winding groove portion. A magnetic head having a structure in which a film is formed and is butt-joined via a gap material. 2. In a laminated magnetic head having a structure in which a main magnetic path is composed of a soft magnetic alloy thin film and an insulating film, and both side surfaces are sandwiched by non-magnetic substrates, an insulating film is formed on at least one winding groove portion. A method of manufacturing a magnetic head comprising: a film forming step, a step of polishing a gap surface to form a mirror surface, and a step of butt-joining via a gap material. 3. A laminated magnetic head having a structure in which a main magnetic path is composed of a soft magnetic alloy thin film and an insulating film, and both side surfaces are sandwiched by non-magnetic substrates, and an insulating film and a Cr film are formed in at least one winding groove portion. A magnetic head having a structure in which glass is formed on a film, and the films are abutted and bonded together via a gap material. 4. A laminated magnetic head having a structure in which a main magnetic path is composed of a soft magnetic alloy thin film and an insulating film, and both sides of which are sandwiched by non-magnetic substrates, and an insulating film and a Cr film are provided in at least one winding groove portion. The process of forming a film, the process of molding glass in the winding groove, the process of securing the winding space by grinding, the process of polishing the gap surface to a mirror surface, and the gap material. And a step of butt-joining via a magnetic head.