JPS6085406A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To enhance a mechanical joining strength to improve precisions of a track width and a gap width by using an alloy solder for adhesion of a back gap constituting face in a high-temperature atmosphere at a specific temperature and charging a molding glass material in track forming grooves. CONSTITUTION:The back gap constituting face of a metallic magnetic body 10 is masked, and a gap spacer 12 consisting of SiO2 or the like is sputtered to a front gap constituting face with a prescribed thickness, and the front gap constituting face is masked, and an alloy solder 16 is sputtered to the back gap constituting face 13. The magnetic body 10 is allowed to face a normal metallic magnetic body 17, where track forming grooves 17a are formed, as shown in a figure, and a glass bar 19 having a prescribed size is inserted to a groove corresponding to a winding window part 10a, and the alloy solder 16 and the glass bar 19 are melted by heat treatment in an N2 or Ar atomosphere at 800-820 deg.C on a basis of respective heat treatment temperatures, and then, the glass bar 19 is charged in grooves 17a and becomes a mold glass 20. A pair of metallic magnetic body blocks produced in this manner are cut to a prescribed thickness (d) to obtain a magnetic head core.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a magnetic head formed by joining a pair of half-core blocks of plate-shaped magnetic material.

Conventional Structure and Problems In recent years, as VTRs have become more densely recorded, magnetic heads using magnetic metals such as Sendust alloy have been developed. A method of manufacturing a magnetic head using such a conventional metal magnetic material will be explained using FIGS. 1 to 8. In Figures 1 to 4, (1) is a metal magnetic material, and has winding windows +2) and track (T, ) forming grooves (1).
5L) has been processed.

(3) is the same metal magnetic material as (1), and the trick forming groove (
It has been processed with pride. t metal magnetic material (1) (3) shown in ta1 and 1g2 fig. At this time, the gap width is set to a predetermined thickness at the front gap part.
A special gap spacer (5) is attached by sputtering or the like, and the thickness is controlled. The pair of completed core half-dead blocks are cut to a predetermined thickness d. W is Si
This is the gap width created by the gap spacer 1511C such as n. FIG. 4 shows the shape of the magnetic core after cutting the core block of FIG. 3. The magnetic held core obtained in the above manner is hollow at the notch portion (6) and therefore easily damages the hollow portion of the track (T), resulting in a defect. ■Lack of III corrosion resistance. ■There are problems such as the accuracy of the gap width W is poor when only the alloy brazing material is bonded.

On the other hand, as a method to solve the above problems, Figures 5 to 8 show
A method as shown in the figure will also be performed and discussed.

That is, after filling the trick regulating grooves of the metal magnetic materials (1) and (3) with glass material (7) and 18) ft, one of the metal magnetic materials (1) was filled with a winding window equivalent to that of the metal magnetic material (1) as shown in Fig. 5. As shown in Fig. 7, the two metal magnetic bodies (1) and 13) are placed facing each other, and the temperature is raised to the melting temperature of the glass to obtain a pair of magnetic half cores. There is a method. Note that the gap spacer (5) is preliminarily attached to a predetermined thickness by sputtering or the like and then cut to a predetermined thickness d to obtain a magnetic core f.

(9) is a filled glass material (molded glass). The magnetic head core obtained by the above method has excellent wear resistance and track width accuracy, but is inferior to the magnetic head core shown in FIG. 4 in terms of mechanical bonding strength of 5.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional technology, has high wear resistance, and has low trick width and gap width. The rad core is applied to a strong magnetic field with a mechanical bonding strength of 4m or 4m.

Structure of the Invention In order to achieve the above object, the method for manufacturing a magnetic head of the present invention includes applying an alloy brazing material to at least one back gap forming surface of a pair of core half blocks made of a plate-shaped magnetic material.
Gap spacers are sputtered to a predetermined thickness on the front gap forming surface, and the pair of core half-dead blocks are butted against each other L/-h, and a glass rod of a predetermined size is inserted into the first winding window. When forming a gap by melting the alloy brazing filler metal in a high-temperature atmosphere of 800 to 820°C, the &Cl1ff period glass rod is simultaneously melted and the molten glass is poured into the pair of core semi-dead blocks. The structure is such that the track forming area is filled.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In the 9th national study, 5iO5'
This figure shows the process of sputtering i4 gap spacer 〇 to a predetermined thickness.
Mask it with resist material 114 or the like.

(10a) is a winding window. Next, as shown in FIG. 9 IBI, the flint gap structure FiL surface 0 is masked with V cyst material, and the back gap structure surface O is sputtered with alloy brazing material. FIG. 10(A) shows the sputter spread adhesion wAt made in the above manner. (10b) is the track forming groove. Figure 10 iB) shows track forming grooves (1) on the metal magnetic body α similar to the conventional metal magnetic body (3).
7JL) was applied. Metal magnetic material made in this way
αη are faced to each other as shown in FIG.
In an N1 atmosphere at ~820°C, a certain i is heat treated in an M atmosphere, and the alloy brazing material and the glass rod u9 are melted and stirred.

As shown in FIG. 12, the glass rod melts and fills the track forming groove, forming mold glass ω. A pair of metal magnetic blocks thus produced are cut to a predetermined thickness dK as shown in FIG. 13 to obtain a magnetic core as shown in FIG. 14. In FIG. 14, W indicates the gap width.

However, the gap spacer 1 and the alloy brazing filler metal may be sputtered onto the surface of the magnetic material, respectively, or they may be sputtered onto the surface of the magnetic material αη. Regarding the sputter film thickness, the thickness of the gear spacer such as Sin is equivalent to the gap width, and the film thickness of the alloy brazing material d is 1.
The size of ~3 μm is the size of the fish. In addition, the glass rod α9 is a metal magnetic material (
To) It is better to get as close as possible to the linear expansion coefficient of Ctη. The linear expansion coefficient of Sendust alloy is 160 x 10-7/d
The linear expansion coefficient of the glass rod must be at least 140 x s o '/deg or more. Also, the heat treatment temperature of alloy brazing material 00 [silver solder] is 800℃.
℃ or higher, and considering that the upper limit is 820℃ in consideration of the heat treatment temperature of glass rod α9, N
A-thread glass is suitable. The atmosphere for heat treatment is
Since the alloy brazing filler metal αG is used, the mechanical bonding strength will be weak unless the oxidation of the metal magnetic material αOσ is prevented. Therefore, a high vacuum is desirable, but the characteristic of the present invention is to melt all the glass at the same time. Because glass foams in high vacuum,
N is suitable for use in the atmosphere, while M medium is suitable for certain types of work.

As described in detail, according to the present invention, the back gear wrap gFl;L surface is bonded with an alloy brazing material, so the mechanical bonding strength is strong, and the track forming grooves are filled with molded glass material. Therefore, it is possible to provide a magnetic head with excellent track width accuracy and gap width accuracy (and excellent wear resistance and C).Furthermore, the melting of the alloy brazing material and the melting of the glass rod can be performed at the same time in one heat treatment. Therefore, mass productivity is excellent.

[Brief explanation of drawings]

1 to 4 show each manufacturing process of a conventional magnetic head, and FIGS. 1 and 2 are perspective views of a half-core core block, and
The figure is a perspective view of the core pro-tsuk, Figure 1g4 is a perspective view of the magnetic core, Figures 5 to 8 show each IMa process of other conventional magnetic heads, and Figures 5 and 6 are the core. Fig. 7 is a perspective view of the half block, and Fig. 8 is a perspective view of the core block.
The figure is a perspective view of the magnetic head 1A, and FIGS. 9 to 14 show each manufacturing process of the magnetic head in an embodiment of the present invention.
Figure 9 (Al [Bl is a front view of the core half-closed block, Figure 10 is a perspective view of the core half-closed block, Figure 11 is a perspective view of the core block, Figure 12 is along the line ■-■ of Figure 11. A sectional view, Fig. 13 is a perspective view of the core block, and Fig. 14 is a perspective view of the magnetic head core.
...Front gap - A side, tU... Gap spacer - 1j... Ba Fugu gap *aa, t18...
・Alloy brazing filler metal, (10b) (17a)...Track forming groove,]...Glass rod, field...Mold glass agent Yoshihiro Moriki Figure 1 Figure 3 Figure 5 Figure 7 q figure 11 figure 13 figure 2θ 7 figure 14

Claims (1)

[Claims] 1. Sputtering an alloy brazing material to a predetermined thickness on at least one back gap forming surface and a gap spacer on the front gap forming surface of at least one of a pair of core half-dead blocks made of a plate-shaped magnetic material, These pair of core half-dead blocks are butted against each other, a glass rod of a predetermined size is inserted into the winding window, and the alloy brazing material is melted in a high temperature atmosphere of 800-820°C to form a gap.
A method for manufacturing a magnetic head, which comprises melting a glass rod and filling the molten glass into track forming areas of each of the pair of core semi-dead blocks. 2. As a glass rod, the coefficient of linear expansion is 140 x 10
Claim 1: A method of manufacturing a magnetic head according to Kigeki, in which Na-based glass having a particle diameter of 1/ydeg or more is #ULn. β, Patent (1) in which gap formation is performed in an Na atmosphere
1) A method for manufacturing a magnetic head according to claim 1 or 2. manufacturing method.