JPH06223313A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent peeling of a junction part of a magnetic ferrite substrate and a non-magnetic substrate as caused by heating in the lamination of the substrate. CONSTITUTION:A magnetic head is made up of a pair of magnetic core half bodies 7 and 8 joined together. The magnetic core half bodies 7 and 8 has metal magnetic films 1 and 2 sandwiched with first substrates 3 and 4 in which slide contact parts 3a and 4a with a magnetic recording medium sliding in contact therewith comprises a non-magnetic material N and back parts 3b and 4b comprises a magnetic material M and second substrates 5 and 6 comprising a non-magnetic material N. A glass transition point Tg of glass with which the slide contact parts 3a and 4a of the first substrates 3 and 4 is made higher than a glass yielding point Tc of the glass with which the first substrates 3 and 4 are joined on the second substrates 5 and 6 sandwiching the metal magnetic films 1 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head mounted on, for example, a video tape recorder, and more particularly to a magnetic head most suitable as a high density magnetic recording head.

[0002]

2. Description of the Related Art In the field of magnetic recording, for example, as a magnetic head for high-density magnetic recording having excellent high frequency characteristics, development of a laminated metal film head in which metal magnetic thin films are laminated in multiple layers with an insulating film interposed therebetween. Is being done. As such a magnetic head, for example, magnetic core halves made by sandwiching a laminated metal film formed by laminating a number of thin metal magnetic thin films with an insulating film interposed between a pair of magnetic core substrates. Is formed by abutting the end faces of the laminated metal film with each other and joining and integrating them with fused glass.

Generally, in this type of magnetic head,
Since the film thickness of the laminated metal film is the track width of the magnetic gap, a substrate made of a non-magnetic material such as ceramics or crystallized glass is used as the magnetic core substrate.

However, in such a magnetic head, when the track width is narrowed in order to achieve higher density recording, the head efficiency is deteriorated due to the reduction of the cross-sectional area of the core forming the magnetic path.

Therefore, in the prior art, in order to prevent deterioration of head efficiency by securing the core cross-sectional area, a method of using magnetic ferrite for the magnetic core substrate and a bonded substrate formed by bonding magnetic ferrite and a non-magnetic material Is proposed to be used. According to these methods, even if the track is narrowed, the core cross-sectional area is sufficiently secured by the magnetic ferrite, so that deterioration of head efficiency can be suppressed as compared with a magnetic head using a non-magnetic substrate. .

Of these, when an attempt is made to produce a laminated metal film head using a magnetic ferrite substrate, a step for regulating the track width is required, which complicates the manufacturing process. Further, since the track width is obtained by machining, the narrower the track, the more difficult it is to obtain dimensional accuracy.

On the other hand, in the case of using a bonding substrate formed by bonding a ferrite substrate and a non-magnetic substrate, even if these bondings are made by metal bonding by low temperature thermal diffusion or glass, before the metal magnetic film is formed thereafter. When the main surfaces of these bonded substrates are mirror-polished by polishing or the like in the process, a step difference of about 10 to 20 nm occurs at the bonded portion. Such a step adversely affects the magnetic characteristics of the metal magnetic film formed in the next step.

Therefore, it is desirable to use a non-magnetic substrate for the substrate on which the metal magnetic film is formed by sputtering or the like, and a magnetic ferrite substrate and a non-magnetic substrate are used for the substrate on which the metal magnetic film is laminated. It is desirable to use the bonded substrate. With this configuration, the magnetic characteristics of the metal magnetic film are not deteriorated, the core cross-sectional area is secured by the magnetic ferrite substrate, and the reduction in head efficiency can be suppressed.

[0009]

By the way, in order to produce a bonded substrate, there is a method of metal bonding using low temperature thermal diffusion, or a method of using a glass film formed by sputtering or the like, or frit glass coated by spin coating or the like. Can be mentioned.

However, in the case of metal bonding using low temperature heat diffusion, it is necessary to extremely improve the surface roughness and flatness of the bonding surface, which is troublesome and the process becomes complicated. on the other hand,
When glass is used, there is a problem that peeling is likely to occur at the bonding portion due to heating during the lamination of the substrates sandwiching the metal magnetic film.

Therefore, the present invention has been proposed in view of such conventional technical circumstances, and it is possible to prevent peeling of a joint portion between a magnetic ferrite substrate and a non-magnetic substrate due to heating during substrate lamination. An object of the present invention is to provide a magnetic head having high reliability.

[0012]

In order to achieve the above-mentioned object, the present invention provides a first substrate in which a sliding contact portion in sliding contact with a magnetic recording medium is made of a non-magnetic material and a back portion is made of a magnetic material. In a magnetic head in which a pair of magnetic core halves formed by sandwiching a metal magnetic film in the film thickness direction with a second substrate made of a non-magnetic material are joined and integrated, the sliding contact portion of the first substrate The glass transition point Tg of the glass that joins the back portion is higher than the glass deformation point Tc of the glass that joins the first substrate and the second substrate across the metal magnetic film.

[0013]

In the magnetic head according to the present invention, the glass transition point Tg of the glass that joins the sliding contact portion and the back portion of the first substrate is sandwiched between the first substrate and the second substrate by sandwiching the metal magnetic film. Since the temperature is higher than the glass deformation point Tc of the glass to be bonded, when the first substrate and the second substrate are bonded with the metal magnetic film sandwiched therebetween, peeling occurs at the bonding portion of the first substrate. Absent.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. As shown in FIG. 1, the magnetic head of this embodiment has a pair of magnetic layers in which metal magnetic films 1 and 2 are sandwiched between first substrate 3 and 4 and second substrate 5 and 6 in the thickness direction. The magnetic core halves 7 and 8 are composed of the core halves 7 and 8.
The two end faces are abutted to each other and are joined and integrated by the fused glass 9.

The magnetic core halves 7 and 8 are composed of the metallic magnetic films 1 and 2 serving as main cores, and the first and second substrates 3 and 4 serving as auxiliary cores sandwiching the magnetic magnetic films 1 and 2 from the thickness direction. , 6 to sandwich the metal magnetic films 1 and 2 deposited on one main surface of the second substrates 5 and 6 so as to sandwich the first substrate 3,
4 are laminated to be joined and integrated.

The metal magnetic films 1 and 2 are thin magnetic metal thin films 1a, 1b and 2 for the purpose of improving high frequency characteristics, as shown in an enlarged view of the sliding surface of the magnetic recording medium in FIG.
It is a laminated metal film formed by laminating a and 2b in multiple layers with insulating films 10b and 11b interposed therebetween. And the second
At the interfaces between the substrates 5 and 6 and the magnetic metal thin films 1a and 2a,
Base films 10a and 11a are formed to improve the adhesive force and prevent the reaction.

The magnetic metal thin films 1a, 1b and 2a, 2
In b, for example, sendust (Fe-Al-Si) or Fe
A film made of -Ru-Ga-Si, a crystalline magnetic metal material obtained by adding O, N, or the like to these, or a Fe-based or Co-based microcrystalline magnetic metal material can be used. The thickness of the magnetic metal thin films 1a, 1b and 2a, 2b herein is 2 to 5 per layer from the viewpoint of avoiding eddy current loss.
It is desirable that the thickness is μm.

The insulating films 10b and 11b are
For example, an oxide film such as SiO ₂ or Ta ₂ O ₅ or Si ₃ N ₄
A nitride film or the like is used. The insulating films 10b and 11
The film thickness of b is preferably about 0.1 to 0.3 μm, for example.

Meanwhile, the base film 10a, the 11a, the magnetic metal thin film 1a, 2a and the need to increase the adhesion between the second substrate 5, 6, SiO _2, Ta ₂ O ₅ or the like oxide film, S
A nitride film of i ₃ N ₄ or the like, a metal film of Cr, Al, Si, Pt or the like, an alloy film thereof, or a laminated film combining them is used.

In this embodiment, the magnetic metal thin film 1a,
Sendust and insulating films 10b and 11 on 1b and 2a and 2b
SiO ₂ was used for b, and films made of SiO ₂ were used for the base films 10a and 11a. The film thickness at that time is 5μ when the track width is
In order to set m, the magnetic metal thin films 1a, 1
b, 2a and 2b are 2.4 μm, insulating films 10b and 11b are 0.2 μm, and base films 10a and 11a are 50 nm.

In the first substrates 3 and 4, the sliding contact portions 3a and 4a which are in sliding contact with the magnetic recording medium are made of a non-magnetic material N, and the back portions 3b and 4b which are the other portions are made of a magnetic material M. There is. Sliding contact parts 3a, 4a and back parts 3b, 4b
In this embodiment, the inclined surfaces 12a of the winding grooves 12 and 13 for controlling the depth of the magnetic gap g and winding the coil,
13a is joined and integrated at a midway position.

These sliding contact portions 3a, 4a and the back portion 3b,
4b, as shown in FIG.
It is joined and integrated by a glass film 15 formed by sputtering glass through underlying films 14a and 14b made of Cr. The base films 14a and 14b interposed between the sliding contact portions 3a and 4a and the glass film 15 and between the back portions 3b and 4b and the glass film 15 are provided for the purpose of improving the adhesive force of the glass film 15 or preventing reaction. It is what is done. Although only one magnetic core half body 7 is shown in FIG. 2, the other magnetic core half body 8 has the same structure.

As the glass film 15, a film made of frit glass applied by spin coating or the like can be used in addition to the film formed by sputtering glass. The base films 14a and 14b are made of Si.
An oxide film of O ₂ , Ta ₂ O ₅ or the like, a nitride film of Si ₃ N ₄ or the like, a metal film of Al, Si, Pt or the like in addition to Cr, or a laminated film combining them can be used. In this example, a 0.1 μm thick Cr film was formed on each of the joint interfaces between the sliding contact portions 3a and 4a and the back portions 3b and 4b, and then a 0.2 μm thick glass film 15 was formed.

The non-magnetic material N used for the sliding contact portions 3a, 4a is, for example, CaTiO ₃ , ZrO ₂ , B.
Examples include ceramics such as aTiO _2, crystallized glass, and non-magnetic ferrite. On the other hand, the back portions 3b and 4
For the magnetic material M used for b, magnetic ferrite or the like is used.

On the other hand, the second substrates 5 and 6 are all made of a non-magnetic material N from the sliding contact portion slidingly contacting the magnetic recording medium to the back portion. For the second substrates 5 and 6, for example, substrates made of ceramics such as CaTiO ₃ , ZrO ₂ , BaTiO ₂ or the like, crystallized glass, non-magnetic ferrite or the like can be used. Then, the metal magnetic films 1 and 2 described above are formed on the main surfaces of the second substrates 5 and 6.

The first substrates 3 and 4 having the above structure
The second substrates 5 and 6 are formed on the base films 16a, 16b and 1 made of Cr as shown in FIG.
It is joined and integrated by glass films 18 and 19 formed by sputtering low melting point glass via 7a and 17b. As the glass films 18 and 19, films made of frit glass applied by spin coating or the like can be used in addition to those formed by sputtering glass. The magnetic metal thin films 1b and 2b or ferrite (back portions 3b and 4b of the first substrates 3 and 4) and the glass films 18 and 19 are formed on the base films 16a, 16b and 17a and 17b.
For the purpose of preventing reaction with etc., oxide films of SiO ₂ , Ta ₂ O ₅ , etc., nitride films of Si ₃ N _4, etc., Cr, Al, P
A metal film such as t or a laminated film combining them can be used.

In this embodiment, 0.1 μm thick C is formed on each of the magnetic metal thin films 1b and 2b and on the main surfaces of the first substrates 3 and 4.
After forming the r film, a 0.2 μm thick Pb-based low melting point glass was sputtered.

In the magnetic core halves 7 and 8 constructed as described above, the end faces of the metal magnetic films 1 and 2 present on the abutting faces are abutted to each other via a gap film (not shown) and fused. A magnetic gap g is formed between the abutting surfaces of the metal magnetic films 1 and 2 by gap-bonding by the glass plate 9 to operate as a recording / reproducing gap.
Is configured. Further, in this magnetic head, a step is provided on the sliding surface of the magnetic recording medium that is in sliding contact with the magnetic recording medium in order to ensure contact with the magnetic recording medium, and the coil formed in the winding grooves 12 and 13 is wound. This winding groove 1 to make the mounting condition good
Winding auxiliary grooves 20 and 21 are formed at positions opposed to 2 and 13, respectively. In order to secure the bonding strength of the magnetic core halves 7 and 8, glass grooves 22 and 23 are formed on the back-side butting surfaces of the magnetic core halves 7 and 8.

In the magnetic head thus constructed, the magnetic materials 1 and 2 serving as the main cores and the magnetic materials arranged on the back portions 3b and 4b of the first substrates 3 and 4 serving as the auxiliary cores. Since the closed magnetic circuit is formed by M and M, the track width of the magnetic gap g is narrowed (for example, 1
Even if it is 3 μm or less), by ensuring sufficient core cross-sectional area,
It is possible to prevent a decrease in head effectiveness. Therefore, recording / reproducing can be satisfactorily performed on the high-density magnetic recording medium.

In particular, in the magnetic head of this embodiment, the sliding contact portions of the first substrates 3 and 4 due to heating when the first substrates 3 and 4 and the second substrates 5 and 6 are laminated. 3a,
The glass transition point Tg of the glass joining the sliding contact portions 3a, 4a and the back portions 3b, 4b is set to the first substrate 3, in order to prevent the joining portions of the back portions 3a, 4a and the back portions 3b, 4b from coming off.
It is set higher than the glass deformation point Tc of the glass that joins the second substrate 5 and the second substrate 5 and 6. By defining the two glasses in this way, it is possible to avoid peeling of the bonded portion of the first substrates 3 and 4 due to heating during substrate lamination. Regarding that it is possible to avoid peeling of the joint,
Based on the following experimental results.

Experimental Conditions As the glass for making the bonded substrates (first substrates 3 and 4), the following three types of glass were used. Glass A: Tg = 465 ° C., Tc = 495 ° C. Glass B: Tg = 490 ° C., Tc = 530 ° C. Glass C: Tg = 547 ° C., Tc = 610 ° C. Substrate stacking (first substrates 3, 4 and second As the glass for bonding the substrates 5 and 6), the following three types of glass were used.

Glass D: Tg = 430 ° C., Tc = 480 ° C. Glass E: Tg = 465 ° C., Tc = 495 ° C. Glass F: Tg = 500 ° C., Tc = 530 ° C. A magnetic head was produced, and it was examined whether or not peeling occurred at the bonded portion of the bonded substrate due to heating during substrate lamination. The results are shown in Table 1. In Table 1, ◯ indicates that peeling did not occur, and x indicates that peeling occurred.

[0033]

[Table 1]

From these results, in the magnetic heads produced by using glass in which the glass transition point Tg of the glass for forming the bonded substrate is higher than the glass deformation point Tc of the glass for stacking the substrates, both of the bonded substrates are used. It was confirmed that peeling did not occur at the joint part. On the other hand, when the glass for making the bonded substrate has a glass transition point Tg smaller than the glass deformation point Tc of the glass for stacking the substrates, both are bonded to the bonded substrate. Peeling occurred. As can be seen from the above experimental results, the glass transition point Tg of the glass for forming the bonded substrate is set higher than the glass deformation point Tc of the glass for stacking the substrates, so that the bonded substrates are bonded by heating during the substrate stacking. It is possible to prevent the parts from peeling off.

Next, a method for manufacturing the above-described magnetic head shown in FIG. 1 will be described in the order of steps with reference to the drawings. First, as shown in FIG. 4 (a), CaTi
A nonmagnetic substrate 24 made of O ₂ or the like is prepared, and one main surface 24a of the nonmagnetic substrate 24 is mirror-finished by polishing or the like.

Next, one main surface 24a of the non-magnetic substrate 24
Then, the metal magnetic films 25 and 26 are formed in a strip shape so as to be parallel to each other with a predetermined interval by using mask sputtering in a necessary minimum area.

When forming the metal magnetic films 25 and 26, as shown in FIG. 4B, a base film 27 made of SiO ₂ is formed to improve the adhesion with the non-magnetic substrate 24. Of 50 nm. In order to improve the high frequency characteristics, the metal magnetic films 25 and 26 are magnetic metal thin films 25a and 25b made of sendust having a small thickness via the insulating film 28 (one metal magnetic film 26 is not shown). Was formed by laminating several layers. In this embodiment, the magnetic metal thin films 25a and 25b each having a thickness of 2.4 μm are formed through the insulating film 28 having a thickness of 0.2 μm.
Were stacked in two layers.

Next, a rectangular non-magnetic substrate 29 as shown in FIG. 5A is prepared. Then, after the main surface 29a of the non-magnetic substrate 29 is mirror-finished by polishing or the like, a glass film 30 is formed by sputtering as shown in FIG. At that time, a base film 31 made of Cr is formed for the purpose of improving the adhesive force of the glass film 30 or preventing reaction.

In this example, Cr was deposited to a thickness of 0.1 μm, and then glass was deposited to a thickness of 0.2 μm.

Next, as shown in FIG. 6A, a magnetic ferrite substrate 32 for joining and integrating with the non-magnetic substrate 29 is prepared. And this magnetic ferrite substrate 3
After mirror-finishing the second main surface 32a, the main surface 32a is
As shown in FIG. 6B, a base film 33 made of Cr was formed, and a glass film 34 was formed thereon by sputtering.

In this example, Cr was deposited to a thickness of 0.1 μm, and then glass was deposited to a thickness of 0.2 μm.

Next, the non-magnetic substrate 29 and the magnetic ferrite substrate 32 are butted against each other with the glass films 30 and 34 as the abutting surfaces as shown in FIG. To do. At this time, the glass films 30 and 34 formed on the abutting surfaces of each other are as shown in FIG.
As shown in (b), they melt and fuse with each other. As a result, the non-magnetic substrate 29 and the magnetic ferrite substrate 32 are firmly joined and integrated.

Then, the main surface 35a of the bonded and integrated bonded substrate 35 is mirror-finished by polishing or the like.

Thereafter, as shown in FIG. 7C, a base film 36 made of Cr is formed on the main surface 35a of the bonding substrate 35, and then a Pb-based low melting point glass is sputtered to form a glass film 37. Was deposited. In this embodiment, the film thickness is 0.
After depositing Cr to a thickness of 1 μm, the glass is 0.2
The film was formed to have a thickness of μm.

Similarly, as shown in FIG. 8, a base film 38 made of Cr is formed on the metal magnetic films 25 and 26 on the non-magnetic substrate 24, and then a Pb-based low melting point glass is sputtered. Then, the glass film 39 was formed.

Next, the non-magnetic substrate 24 and the bonding substrate 35 are
As shown in FIG. 9 (a), the glass films 37 and 39 formed on the abutting surfaces are abutted against each other and pressed to each other 5
Heat to 00 ° C-700 ° C. As a result, the glass films 37 and 39 formed on the abutting surfaces of each other are separated from each other as shown in FIG.
Fused as shown in.

At this time, the glass transition point Tg of the glass at the bonded portion of the bonded substrate 35 is set higher than the glass deformation point Tc of the glass for stacking the substrates. The joint portion of the substrate 35 does not peel off.

Next, the laminated substrate integrated and joined is
The magnetic head is cut at the positions indicated by the line AA ', the line BB', and the line CC 'in FIG. 10 at the same angle as the azimuth angle given to the magnetic head. Then, after removing unnecessary portions of the ferrite by using a surface grinder or the like, winding grooves 42 for winding the coil are formed on the magnetic core half blocks 40, 41 as shown in FIGS. 11 and 12. Glass grooves 44 and 45 for glass fusion with 43 are formed on the respective butting surfaces.

The winding grooves 42, 43 and the glass grooves 44, 4
5 is formed as a groove having a substantially U-shaped cross section, but one side surface 42a, 43a of the winding groove 42, 43 is an inclined surface in order to restrict the depth of the magnetic gap g.
The other side surfaces 42b, 43b of the winding grooves 42, 43
May be an inclined surface or a vertical surface.

Next, the magnetic core half blocks 40,
41, glass inflow grooves 46a, 46b and 47a, 47b for securing the bonding strength of the block are formed.
Such glass inflow grooves 46a, 46b and 47a, 47
b are formed on both sides of the metal magnetic films 25 and 26 and at positions close to the metal magnetic films 25 and 26 as grooves having a substantially U-shaped cross section over the entire block.

Next, the magnetic core half blocks 40,
Gap forming surfaces 40a, 41a which are abutting surfaces of 41
Is mirror-finished by polishing or the like.

Then, one magnetic core half block 40
After forming a gap film (not shown) on the gap forming surface 40a of FIG. 15 or on the gap forming surfaces 40a and 41a of both magnetic core half blocks 40 and 41, as shown in FIG. The blocks 40 and 41 are abutted while the tracks are aligned, and the gap bonding is performed while the fused glass 48 is poured.

As a result, these magnetic core half blocks 4
0 and 41 are joined and integrated by a fused glass 48,
A magnetic gap g that operates as a recording / reproducing gap is formed between the abutting surfaces of the metal magnetic films 25 and 26. Then, after forming a winding auxiliary groove in the ferrite block joined and integrated by the fused glass 48, the sliding surface of the magnetic recording medium is cylindrically polished to be subjected to width processing and cut into a predetermined chip shape. To do.

As a result, the magnetic head capable of excellent recording and reproducing on the high density recording medium shown in FIG. 1 is completed.

[0055]

As is apparent from the above description, in the magnetic head of the present invention, the glass transition point Tg of the glass that joins the sliding contact portion and the back portion of the first substrate is set to the metal magnetic film. Since it is set higher than the glass deformation point Tc of the glass for joining the first substrate and the second substrate, when the first substrate and the second substrate are heated and joined by sandwiching the metal magnetic film. Moreover, peeling does not occur at the bonded portion of the first substrate. Therefore, while improving the mechanical strength,
The electromagnetic conversion characteristics are improved, and recording / reproduction can be performed in a good state on a high density recording medium.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head to which the present invention is applied.

FIG. 2 is an enlarged cross-sectional view of a main part of the magnetic head of FIG. 1, showing an enlarged joint portion of a first substrate.

FIG. 3 is an enlarged sectional view of an essential part showing an enlarged sliding surface portion of a magnetic recording medium in the magnetic head of FIG.

FIG. 4 is a sequential view showing steps of manufacturing the magnetic head of the present invention, (a) is a perspective view showing a step of forming a metal magnetic film on a non-magnetic substrate, and (b) shows a metal magnetic film portion. It is a principal part expansion front view which expands and shows.

5A to 5C sequentially show steps of manufacturing the magnetic head of the present invention, FIG. 5A is a perspective view of a non-magnetic substrate for producing a bonded substrate, and FIG. It is a principal part enlarged front view which shows the process of forming a film.

6A and 6B sequentially show steps of manufacturing the magnetic head of the present invention, FIG. 6A is a perspective view of a magnetic ferrite substrate for producing a bonded substrate, and FIG. 6B is a view showing a glass film on the magnetic ferrite substrate. It is a principal part enlarged front view which shows the process of forming a film.

FIG. 7 is a perspective view sequentially showing steps of manufacturing the magnetic head of the present invention, in which FIG. 7A is a perspective view showing a step of bonding a non-magnetic substrate and a magnetic ferrite substrate to form a bonded substrate;
FIG. 7B is an enlarged plan view of an essential part showing the joined part of the joined substrate in an enlarged manner, and FIG. 7C is an enlarged side view of an essential part showing the joined part of the joined substrate in an enlarged manner.

FIG. 8 is an enlarged front view of essential parts showing the steps of manufacturing the magnetic head of the present invention sequentially, showing the step of forming a glass film on a metal magnetic film formed on a non-magnetic substrate.

FIG. 9 is a perspective view sequentially showing a process of manufacturing the magnetic head of the present invention, in which (a) is a perspective view showing a process of bonding a non-magnetic substrate having a metal magnetic film formed thereon and a bonded substrate; [FIG. 4] is an enlarged front view of a main part showing an enlarged view of a joint portion thereof.

FIG. 10 is a perspective view sequentially showing a process of manufacturing the magnetic head of the present invention, showing a process of cutting the bonded laminated substrate.

FIG. 11 is a perspective view sequentially showing steps of manufacturing the magnetic head of the present invention, showing steps of forming a winding groove and a glass groove in one magnetic core half block.

FIG. 12 is a perspective view sequentially showing the steps of manufacturing the magnetic head of the present invention and showing the step of forming the winding groove and the glass groove in the other magnetic core half block.

FIG. 13 is a perspective view sequentially showing a process of manufacturing the magnetic head of the present invention, showing a process of forming a glass casting groove in one magnetic core half block.

FIG. 14 is a perspective view sequentially showing the steps of manufacturing the magnetic head of the present invention, showing the step of forming the glass casting groove in the other magnetic core half block.

FIG. 15 is a perspective view showing a glass fusing step, which sequentially shows steps for manufacturing the magnetic head of the present invention.

[Explanation of symbols]

 1, 2 ... Metal magnetic film 1a, 1b, 2a, 2b ... Magnetic metal thin film 3, 4 ... First substrate 3a, 4a ... Sliding contact portion 3b, 4b ... Back portion 5 , 6 ... Second substrate 7, 8 ... Magnetic core half body 9 ... Fused glass 12, 13 ... Winding groove 15, 18, 19 ... Glass film 20, 21 ...・ Auxiliary winding grooves 22, 23 ... Glass grooves

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomio Kobayashi 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (1)

[Claims] 1. A metal magnetic film formed by a first substrate having a non-magnetic material in a sliding contact portion with which a magnetic recording medium is in sliding contact and a magnetic material in a back portion, and a second substrate made of a non-magnetic material. In a magnetic head in which a pair of magnetic core halves sandwiched from the thickness direction are joined and integrated, a glass transition point Tg of glass joining a sliding contact portion and a back portion of a first substrate is the metal magnetic film. A magnetic head characterized in that it is higher than a glass deformation point Tc of glass for joining the first substrate and the second substrate with each other.