JPS63119002A - Magnetic head - Google Patents

Abstract

PURPOSE:To complete the joining of a core by building in a member having mechanical strength larger than a glass in a glass pool. CONSTITUTION:In a glass pool 4, a ferrite-made member 10 with the mechanical strength larger than a glass 6 is distributed. The member 10 is formed by the same ferrite material as both core parts 2a and 2b and a cross section is circular. The member 10 is brought into contact with a surface 2s of the core part 2a respectively in parallel to surfaces 4a and 4b of the core part 2b to form the glass pool 4. To a residual part in the glass pool 4, the glass 6 is charged. Thus, when the member 10 having the mechanical strength larger than the glass is built in the glass pool 4, the member comes to be core, resists the stress to concentrate on the vicinity of the central part of the glass pool 4, and therefore, the generation of the crack is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention relates to a magnetic head used in a VTR1FDD and the like.

[Sub] West Exit Branch Technique - In a conventional magnetic head of this type, for example for a VTR, as shown in Fig. 2, two core parts 2a12b made of a ferromagnetic material such as ferrite are joined. An integrated core 2 is constructed.

A gap 7 is formed in the tape sliding surface 2t of the core 2, and the track width W of the gap 7 is equal to the glass reservoir 3.
regulated by. A glass reservoir 4 having a triangular cross section or the like is provided at the bottom of the core portion 2b, passing through both side surfaces of the core portion.
is provided. Both glass reservoirs 3.4 are filled with low melting point glass 5.6.

A non-magnetic thin film is disposed as a spacer in the gap 7, and the bonding strength between both core portions 2ai2b is maintained mainly by the fusion of the low melting point glass 6 in the glass reservoir 4. By this fusion of the glass 6 within the glass reservoir 4, the surface of the glass reservoir 4 and the side surface of the core portion 2a facing the glass reservoir 4 are firmly adhered via the glass 6. Further, a coil 8.9 is wound around the core 2.

Such a magnetic helad 11 is manufactured as follows. That is, as shown in FIG. 3, a large number of fast funnel-shaped grooves 32a132b are formed at each predetermined track width W in the upper portions of opposing sides of a block material 31a131b made of a ferromagnetic material such as single-crystal ferrite. In addition, block material 31b
A long groove 3 having a triangular cross section is formed on the side surface of the gap forming surface.
3 in the longitudinal direction.

After disposing an extremely thin non-magnetic thin film between the gap forming surfaces of both block materials 31a131b and filling the grooves 35a135b133 with low melting point glass, both block materials 31a and 31b are coated with copper metal, etc., as shown in FIG. The blocks 31a and 131b are clamped without applying pressure using a clamping jig 41 made of the same material, heated in a heating furnace 42, and the glass is fused to join both block materials 31a131b to form an integral block 34. This block 3
After polishing the upper end surface of the block 34 into a curved surface, the block 34 is sliced with a wire saw or the like into a large number of cores 2, and a coil 8.9 is wound around each core 2 to obtain the magnetic head 11.

B 9 B In the conventional magnetic head having the above configuration, for example, when force is applied to the core 2 during the above-mentioned heat fusion, the glass 6 in the glass reservoir 4 (particularly near the center of the glass) ), and a rack C is generated on the glass 6 in the glass reservoir 4 as shown in Figure 5.
There is a problem that the core 2 is not completely joined.

The present invention has been made in view of the problems of conventional magnetic heads, and even if force is applied to the core, stress is not concentrated on the glass in the glass reservoir that contributes to bonding, thus preventing cracks. It is an object of the present invention to provide a magnetic head having a structure that can prevent the occurrence of.

In order to achieve the above-mentioned object, in the present invention, two core portions are joined by fusing glass in a glass reservoir formed in at least one of the core portions to form a core. The magnetic head is characterized in that a member having greater mechanical strength than glass is built into the glass reservoir.

When the magnetic head is configured as described above, the core is a member with greater mechanical strength than the glass, which resists the stress concentrated near the center of the glass reservoir, causing cracks to form. is prevented.

Real-”L-Example 1 FIG. 1 shows an embodiment of the magnetic head of the present invention.

The structure of the magnetic helad 1 of this embodiment is such that a ferrite member 10 having a mechanical strength greater than that of the glass 6 is placed inside the glass reservoir 4.
Since the structure is the same as that of the conventional example described above except that , the same reference numerals are given to the same parts and the description thereof will be omitted.

This member 10 is made of the same ferrite material as both core parts 2a12b, and has a circular cross section. This member 1
0 indicates surfaces 4a, 4 of the core portion 2b forming the glass reservoir 4.
b and the surface 2s of the core portion 2a. The remaining portion of the glass reservoir 4 is filled with glass 6 as in the conventional case. When the member 10 having greater mechanical strength than glass is built into the glass reservoir 4 in this way,
This member 10 acts as a core and resists the stress concentrated near the center of the glass reservoir 4, thereby preventing the occurrence of cracks.

The production of this embodiment with such a configuration is similar to the production of the conventional example described above, after placing a ferrite round bar of the same length as the block material 31b in the groove 33, a low This can be done by filling the melting point glass 6.

In the above embodiment, the same ferrite as both core parts is used as the member arranged in the glass reservoir 4, but in the present invention, any material having higher mechanical strength than the glass 6 can be used. Either can be used.

However, it is preferable to use the same material for both core parts because it facilitates the above-mentioned slicing process and allows good compatibility with the glass 6.

Light W and Elbow As is clear from the above explanation, in the magnetic head according to the present invention, the member with high mechanical strength in the glass reservoir resists the stress concentrated near the center of the glass reservoir. So,
Cracks no longer occur in the glass reservoir, the cores are perfectly bonded, and a high quality magnetic head can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the external appearance of an embodiment of the present invention, Fig. 2 is a perspective view of a conventional example, Fig. 2 is an explanatory diagram of one process of manufacturing the conventional example, and Fig. 3 is a manufacturing process of the conventional example. FIG. 4 is an enlarged view of the main part of the conventional example. 1... Magnetic head, 2... Core, 2 a s 2
b... Core part, 2s... Opposing surface, 4... Glass reservoir N 4 az 4b... Glass reservoir surface, 6.
...Glass, 10...member. Figure 1 Figure 2 Procedural amendment (method) September 2, 1985 1. Case description 1988 Patent Application No. 18489 2. Name of the invention Magnetic head 3. Person making the amendment Relationship to the case Patent applicant: Kansai NEC Corporation 5, 2-9-1 Seiran, Otsu City, Shiga Prefecture, 520, subject of amendment 6, "Enlarged view of essential parts" on page 7, line 6 of the detailed description of the amendment. ``An enlarged view of the main part, FIG. 5 is an enlarged view of the main part showing the glass reservoir of the magnetic head shown in FIG. 4.'' This is corrected.

Claims (1)

[Scope of Claim] A magnetic head in which the cores are integrally formed by joining at least two core portions by fusing glass in a glass reservoir formed in at least one of the core portions, comprising: a glass reservoir; A magnetic head characterized by having a built-in member having mechanical strength greater than that of glass.