JPS62145519A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To prevent the occurrence of separation at the time of after-treatment by forming a glass film at the junction surface of a core without having a winding window and two surfaces of the thin plate-shaped core, abutting these surfaces mutually and diffusing and junctioning them by the solid phase reaction when a magnetic head core for recording and reproducing and a magnetic head core for deletion are serially junctioned. CONSTITUTION:The facing surface (junction surface) of I cores 1a and 2a without winding windows 1e and 2e is finished at a mirror surface, two surfaces of a T core 3 are finished at the mirror surface, at the junction surface of the I cores 1a and 2a and the two surfaces of the T core 3, a glass film 7 is respectively formed, the surface to form the glass film 7 is mutually abutted, a pressuring force F is applied and the thermal treatment is executed. As the result, the junction surface forms the mutual diffusing layer by the solid phase reaction and can firmly junction it. After the IC cores 1c and 2a are junctioned, the side to form gap parts 1c and 2c of C cores 1b and 2b having the winding windows 1e and 2e is clashed against the I cores 1a and 2a, the glass is filled and junctioned and next, the part of a back bar is removed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a bulk type magnetic helad in which cores made of magnetic 7-light members are joined in series through non-magnetic ceramic members. be.

[Conventional technology]

With the rapid spread of OA display devices in recent years, the demand for floppy disk devices, for example, has expanded dramatically.The magnetic heads used in these types of devices include a recording/reproducing magnetic head core and an erasing magnetic head core. Bulk type magnetic heads are often used, in which magnetic heads are connected in series.

tJS3 is a perspective view showing an example of the bulk type magnetic head, and FIG. 4 is an enlarged plan view of the main part.

In FIG. 3.4, reference numeral 1 denotes a recording/reproducing magnetic head core in which a pair of magnetic 7-elite cores 1a (I core) and 1b (C core) are joined together by a glass 4. , 2 is an erasing magnetic head core in which a pair of magnetic ferrite cores 2a (I core) and 2b (C core) are joined together by a glass 4.

The recording/reproducing magnetic head core 1 and the erasing magnetic head core 2 each have a thin plate (T core) 3 of a non-magnetic material such as barium titanate or calcium titanate at the opening of each I core la, 2a. They are interposed and joined together in series with 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 head core 2 in a conventional manufacturing process, with the gap portion facing downward.

Conventionally, as shown in Fig. 2(a), first, ■core 1a and C core Ib, and I core 2a and C core 2b are bonded with glass, and then ■cores 1a and 2a are faced and their openings are bonded. T
A C core 1b sandwiching the core 3 and filling with glass or resin,
2b is pressed to press the I cores Ia, 2a and the T core 3 together, thereby joining the cores 1 and 2.

Next, there is a back bar 1cl indicated by dotted diagonal lines in the figure.

The part 2d was removed by machining, and it was formed as shown in FIG. 2(b).

[Problem that the invention seeks to solve]

However, according to the above conventional method, C core Ib,2
The pressing force from b is C core 1b12b and ■core la, 2
The part of the gap IC12c where a is joined and the hack, ? -1d and 2d are strongly applied, but the winding window 1
Since 'e and 2e do not apply much force to the opening of the opposing portion P, a bonding failure between I core la and 2a and T core 3 occurs due to insufficient pressing force, and the above l portion is removed during post-processing. There was a problem that peeling occurred.

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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a magnetic head that eliminates the above-mentioned conventional problems and does not cause peeling during post-processing.

[Means for solving problems]

The present invention provides a magnetic head in which a recording/reproducing magnetic core made of a pair of magnetic ferrite cores and a magnetic head core for erasing made of a pair of magnetic ferrite cores are integrally joined in series via a thin plate-shaped core made of ceramic. In the manufacturing method, a glass film is formed on the joining surface of the recording/reproducing magnetic head core and the erasing magnetic head core, which do not have a winding window, and on both surfaces of the thin plate-like core, and each surface is covered with a glass film. Then, the gap portion forming side of the core with a winding window is brought into contact with the core without the winding window and bonded with glass, and then,
The first feature is to remove a portion of the back bar on the opposite side to the gap portion.

[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 glass film is formed on the bonding surface of the I core and both sides of the thin plate core, that is, the T core, and these surfaces are brought into contact with each other and diffusion bonded by an in-phase reaction, so the entire length is firmly bonded, and no voids occur. do not have.

Therefore, it is possible to greatly reduce peeling accidents during post-process processing.

〔Example〕

FIG. 1 is a front view showing the bonded state of the (1) core and the T-core during the manufacturing process showing one embodiment of the present invention. Figure 1 (a
), first, I-cores Ia, 2a are made of, for example, Mn-Zn-based magnetic ferrite and have no winding windows 1e, 2e.
The opposing surfaces (joint surfaces) of the T cores 3 made of ceramics such as barium titanate or calcium titanate are finished with a mirror finish, and the joint surfaces of the I cores la and 2a and the T cores 3 are finished with a mirror finish. A glass film 7 with a thickness of approximately 20 μm is formed on both sides of the core 3 by sputter deposition or the like, and the surfaces on which the glass films 7 are formed are brought into contact with each other and are moved in the direction of the arrow as shown in FIG. 1(b). A heat treatment was carried out in which a pressing force F was applied and the temperature was maintained at about i, o s o ℃ for 4 hours.

As a result, (1) a mutual diffusion layer was formed at the joint surfaces of the cores la, 2a and the T-core 3 by solid phase reaction, and a strong joint 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 cores 1a and 2a as described above, a winding window 1e made of magnetic ferrite similar to the I core,
Gap portions 1e, 2c of C core 1b12b having 2e
The side forming the I-cores 1a and 2a was filled with glass, and joined into the same shape as the conventional one shown in FIG. 2(a).

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 this process was completed to obtain a shape shown in tiS2 figure (b).

However, as mentioned above, at the beginning of the joining process, 1371 g
, 2a and the T core 3 are in-phase diffusion bonded through a glass, and then the C cores lb and 2b are bonded. This has resulted in a strong bond and fewer peeling accidents during post-processing.

In addition, in the conventional joining method, the defective rate of non-bonded cores la and 2a and 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 and T core was 1
It became below 0%.

〔Effect of the invention〕

Since the present invention has the above-described configuration, ■ the bond between the core and the T-core is strong, and no voids are generated;
This reduces the number of peeling accidents during post-process processing, and greatly improves yield.

[Brief explanation of drawings]

1(a) and 1(b) are front views showing the bonding process of the cores in the manufacturing process of an embodiment of the present invention, and FIG.
a) and (b) are front views of the magnetic head in the conventional manufacturing process, Fig. 3 is a perspective view of the bulk type magnetic head, and Fig. 4 is a front view of the magnetic head in the conventional manufacturing process.
The figure is also an enlarged plan view of the main part. 1: Magnetic head core for recording and reproduction, 2: Magnetic head core for erasing, la, 2a: I core, lbl 2b:
C core, lc, 2c: gear part, 1d, 2d
: Back bar, le, 2e: Winding window, 3: T core, 7: Las membrane agent Patent attorney Honma
Abrasion resistance / O 2nd F

Claims (2)

[Claims] (1) A method for manufacturing a magnetic head in which a recording/reproducing magnetic head core consisting of a pair of magnetic ferrite cores and an erasing magnetic head core consisting of a pair of magnetic ferrite cores are integrally joined in series via a thin plate-shaped core made of ceramics. In this step, a glass film is formed on the bonding surface of the recording/reproducing magnetic head core and the erasing magnetic head core, which do not have a winding window, and on both surfaces of the thin plate-like core, and these surfaces are brought into contact and fixed. Diffusion bonding is carried out by a phase reaction, and 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 back bar on the opposite side from the gap is bonded. A method of manufacturing a magnetic head characterized by removing the magnetic head. (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.