JPS62141607A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To manufacture a magnetic head that does not cause coming off at the time of post-processing by joining ceramic films formed on the surface of a core devoid of a winding window and butting gap forming side of a core having a winding window to the core devoid of the winding window and joining them and removing the part of back bar. CONSTITUTION:Opposing faces (joining faces) of I cores 1a, 2a made of magnetic ferrite and devoid of winding windows, 1e, 2e are finished to mirror face, and ceramic films 7 made of barium titanate etc., are formed respectively to the thickness of about 20mum by sputter vapor deposition process etc. The faces on which ceramic films are formed are butted to each other and kept at a temperature of about 1,050 deg.C for 4hr while applying pressing force F to form a mutual diffusion layer by solid phase reaction, and join them firmly. The side that forms gap parts 1c, 2c of C cores 1b, 2b made of magnetic ferrite similar to the I core and provided with winding windows 1e, 2e is thrusted against I cores 1a, 2a and joined by filling with glass. Then, the part of a back bar is removed by working.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a bulk type magnetic head in which cores made of magnetic ferrite members are connected in series through a non-magnetic material such as a ceramic thin plate. be.

[Traditional American technology]

In recent years, OA*f! With the rapid spread of technology, the demand for floppy disk devices, for example, has expanded considerably.The magnetic heads used in these types of devices include a magnetic head core for recording and reproduction, a magnetic head core for erasing, and a magnetic head core for erasing. Bulk type magnetic heads are often used, in which magnetic heads are connected in series.

FIG. 3 is a perspective view showing an example of the bulk type magnetic head, and FIG. fjS4 is an enlarged plan view of the main part.

In FIG. tIS3.4, reference numeral 1 denotes a recording/reproducing magnetic head core in which a pair of magnetic ferrite cores 1a (I core) and 1b (C core) are joined together by a glass 4. 2 is
A pair of magnetic 7 elite cores 2a (I: r7) and 2b (C
This is an erasing magnetic head core in which: +a) are joined by a glass 4.

A thin plate (T core) 3 of a non-magnetic material such as barium titanate or calcium titanate is interposed between the recording and reproducing magnetic head core 1 and the erasing magnetic head core 2. The magnetic heads are joined together in series using glass or resin, and further sliders 5 and 6 shown by two-dot chain lines in the figure are joined on the left and right sides to form a magnetic head.

FIGS. 2(a) and 2(b) are front views of the recording/reproducing magnetic head core 1 and the erasing magnetic hesid core 2 in a conventional manufacturing process, with the ear portion facing downward.

Conventionally, as shown in Fig. 2(a), first the I core 1a and the C core lb, and the I core 2a and the C core 2b are joined with respective laths, and then ■ the cores 1a and 2a are made to face each other and a T
sandwiching the core 3 and filling it with glass or resin to form a C core 1b;
2b is pressed to press the I cores 1a, 2a and the T core 3 together, thereby joining the cores 1 and 2.

Then, the parts 1d and 2d of packers indicated by dotted lines in the figure were removed by processing, and the result was formed as shown in FIG. 2(b).

[Problem that the invention seeks to solve]

However, according to the above conventional method, C cores 1b and 2
The pressing force from b is C core 1b12b and I tip 1m, 2
The winding window 1e is strongly applied to the gap parts lc and 2c and the pack pars 1d and 2d where the winding windows 1e and
12e does not apply much force between the opposing parts l, so the I cores 1a, 2a and the T core 3 due to insufficient pressing force.
There was a problem in that a bonding failure occurred and peeling occurred at the portion 1 during post-processing.

Further, (2) When the cores la and 2a and the T core 3 are bonded using glass, there is a problem in that portions without glass, that is, voids, are generated in the bonding layer, which promotes the above-mentioned peeling.

Recently, however, there has been a strong demand for an improvement in the magnetic recording density of floppy disk drives, and in conjunction with this, a magnetic head that is compatible with the increased density of magnetic recording is required.

For this purpose, in a bulk type magnetic head, there must be a gap between the recording/reproducing magnetic head core 71 and the erasing magnetic head core 2! It is necessary to reduce the distance d between S 1 c and 20 (see FIG. 4).

To reduce the gap distance d, ■cores 1a, 2a
Since it is not possible to make it very thin, this Ephala
, 2a, the non-magnetic T-core 3 interposed between them must be thin, for example, a thin ceramic plate (about 50 μm thick).
Making the T-core 3 made of m) even thinner is extremely difficult to process and requires a large number of man-hours.

The present invention solves the above conventional problems and makes it easy to create a magnetic head that does not cause peeling during post-processing! ! ! The purpose is to provide a method that can be used to

[Means for solving problems]

The present invention provides a method for manufacturing a magnetic head in which a recording/reproducing magnetic head core made of a pair of magnetic ferrite cores and an erasing magnetic head core made of a pair of magnetic ferrite cores are integrally joined in series via a non-magnetic material. A ceramic film is formed on the surface of the recording/reproducing magnetic head core 7 and the erasing magnetic head core that does not have a winding window, and the surfaces on which the ceramic film is formed are brought into contact and diffusion bonded by solid phase reaction. Then, the gap forming side of the core having a winding window is brought into contact with the core having no winding window and bonded with glass, and then the part of the packer on the opposite side to the gap is removed. That is.

[For production]

When joining a recording/reproducing magnetic head core and an erasing magnetic head core in series, first a core without a winding window,
In other words, ■A ceramic film is formed on the surface of the core, and these surfaces are brought into contact with each other and diffusion bonded by solid phase reaction.
The entire length is firmly joined and no voids occur.

Therefore, it is possible to greatly reduce peeling accidents during processing in subsequent steps.

Further, since there is no need to manufacture and insert a thin T-core, manufacturing is easy.

〔Example〕

FIG. 1 is a front view showing a state in which I-cores are joined to each other during a manufacturing process showing an embodiment of the present invention.

As shown in FIG. 1(a), first, a winding window 1e is made of, for example, Mn-Zn based magnetic heptadite.

The facing surfaces (joint surfaces) of the I cores 1a and 2a without 2e are finished to a mirror finish, and a ceramic film 7 made of, for example, barium titanate or calcium titanate is coated on both sides with a thickness of about 20 μm by sputter deposition or the like. The surfaces on which the ceramic film 7 was formed were brought into contact with each other, and as shown in FIG. 1(b), a heat treatment was performed in which the surfaces were held at a temperature of about 1.050° C. for 4 hours while applying a pressing force F in the upward direction. I did it.

As a result, (2) a mutual diffusion layer was formed at the bonding surface with the core in and 2a by solid phase reaction, and a strong bond could be achieved.

During heat treatment, if the temperature is too low, the solid phase reaction between the two members will not take place sufficiently and the bonding strength will be low; if the temperature is too high, the bonding strength will be high but voids will occur in the bonding layer, so the heat treatment temperature should be 850~ A range of 1300″C is suitable.

After joining the (1) cores 1a and 2a as described above, a winding window 1e made of the same magnetic ferrite as the core (1),
Gap part IC12C of C cores 1b and 2b having 2c
The side forming the I core 1a, 2a was pressed against the I core 2a, filled with glass, and joined in the same shape as the conventional one shown in FIG. 2(a) (however, the T core was not present).

During this bonding, the melting temperature of the glass was lower than the heat treatment temperature of the solid phase diffusion bonding, so there was no adverse effect on the diffusion layer.

Next, back par 1d indicated by dotted diagonal lines in Fig. 2(a)
, 2d were removed by machining, and the process was completed to obtain a shape shown in FIG. 2(b).

Therefore, as mentioned above, at the beginning of the bonding process, the I core la
, 2a were solid-phase diffusion bonded through the ceramic group, and then C cores lb and 2b were bonded, so ■cores la, , 2
With respect to a, the pressing force F was applied evenly over the entire length, resulting in a strong bond and fewer accidents of peeling during processing in the subsequent process.

In addition, in the conventional joining method, the defective rate of non-bonded cores 1a and 2a and the T core was 60% or more, but according to the method of the present invention, the defective rate of non-bonded cores la and 2a was less than 10%. Became.

〔Effect of the invention〕

The present invention 1Δ Since the structure is as described above, ■ the bond between the cores is strong, there is no void generation, and accidents of peeling during post-process processing are reduced, which greatly improves the yield. In addition, since no T-core is used, manufacturing is extremely easy.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are front views showing the joining process of I cores during the manufacturing process showing one embodiment of the present invention, tpJ2
Figures (a) and (b) are front views of a magnetic head in a conventional manufacturing process, Figure M3 is a perspective view of a bulk type magnetic head, and Figure 4 is an enlarged plan view of the main parts. 1: Magnetic head core for recording and reproduction, 2: Magnetic head core for erasing, la, 2a: I core, lb, 2b: C
Core, lc, 2c: Gi+-/bu part, ld,
2d: Back bar, le, 2e: 8M window, 7: Ceramics membrane agent Patent attorney Honma Le Figure 2 (a> (b)/d
24 Figure 300 4

Claims (2)

[Claims] (1) A method for manufacturing a magnetic head in which a recording/reproducing magnetic head core made of a pair of magnetic ferrite cores and an erasing magnetic head core made of a pair of magnetic ferrite cores are integrally joined in series via a non-magnetic material. A ceramic film is formed on the surface of the recording/reproducing magnetic head core and the erasing magnetic head core that do not have a winding window, and the surfaces on which the ceramic film is formed are brought into contact and diffusion bonded by a solid phase reaction, and then the winding is performed. A magnetic head characterized in that the gap forming side of the core having a wire window is brought into contact with the core having no winding window and bonded with glass, and then the part of the back bar on the opposite side to the gap is removed. manufacturing method. (2) A method for manufacturing a magnetic head according to claim 1, characterized in that diffusion bonding by solid phase reaction is carried out within a temperature range of 850 to 1300°C.