JPS61144708A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To improve the reliability of a joining state by forming an adhesive layer of glass with a low fusion point over the entire abutting surface of a magnetic core half body on its back-gap side, fusing and caking the adhesive layer, and thus joining a couple of core half bodies. CONSTITUTION:The core blocks 1 and 3 are jointed together by laminating glass substrates 1' and 37 and magnetic layers 1a and 3a. A wedgelike winding groove 2 is formed continuously in one core block1 lengthwise closely to the surface side where a magnetic recording medium slides. Glass with a low fusion point is sputtered on joining surfaces 8 and 8' of the rear parts (back gap side) of the blocks 1 and 3 to form adhesive layers 9 previously. The blocks 1 and 3 are placed abutting on each other and a glass rod 5 as a caking agent is inserted into the tip part of the groove 2 to perform temporary fixation. The glass rod is heated while pressed and then the adhesive layer 9 and glass rod 5 fuse to join the blocks 1 and 3 completely after cooling. The blocks are cut into magnetic cores 7, thereby improving the reliability of the jointing state.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a method for manufacturing a magnetic head, and more particularly, to a magnetic head equipped with a magnetic core that abuts and integrates a pair of magnetic core halves. The present invention relates to a manufacturing method.

[Prior Art] A so-called bulk type magnetic head uses a magnetic core in which a pair of core halves are butted together to form a magnetic gap.

To join the core halves together, a spacer is interposed in the magnetic gap, so a glass material is usually used.

The reason why glass material is used is that glass material is stable against changes in humidity and is mechanically and chemically stable. A conventional method of manufacturing a magnetic core using such a glass material will be explained with reference to FIGS. 1 to 3.

The illustrated example shows a method of manufacturing a magnetic core used in a magnetic head for a video tape recorder.
, CB), a magnetic core block 1.3 is prepared.

Each core block 1.3 is made up of glass substrates 1', 3' and magnetic layers la, 3a made of a high permeability magnetic material formed by a method such as sputtering, which are laminated at intervals of 2 to 3 mm. The glass substrates adjacent to each other via the layers 1a and 3a are integrated by means such as welding.

Furthermore, a wedge-shaped winding groove 2 is formed continuously along the longitudinal direction of the core block 1 at a position closer to the sliding surface of the magnetic recording medium on the abutting surface of one of the core blocks 1.

Further, at the end opposite to the sliding surface of the magnetic recording medium, a groove 4 having a quadrilateral cross section is formed continuously along the longitudinal direction of the core block 1.

No grooves or the like are formed on the other core block 3 side.

The core blocks 1.3 having such a structure are butted together as shown in Fig. 2, and a glass rod 5 is inserted into the tip of the winding groove 2, and a glass JIJ 6 is inserted into the groove 4, and temporarily fixed. .

When the core blocks 1.3 are heated while being pressurized in this state, the glass rods 5.6 are melted, and when this is cooled and solidified, the core blocks 1.3 are reliably joined.

Next, there is a magnetic layer 1a shown by line A-A in FIG.

The magnetic core 7 as shown in FIG. 3 is obtained by cutting along cutting lines that intersect 3a.

Subsequently, winding is applied using the winding groove 2 to form a magnetic head.

By the way, when the method described above is adopted, the area of the portion joined by the glass material is small, so there is a drawback that the joining strength is weak.

Furthermore, since the molten state of the glass rod is not always uniform, there is a drawback that the reliability of the bonded state is reduced.

[Purpose] The present invention has been made to eliminate the above-mentioned conventional drawbacks, and provides a method for manufacturing a magnetic head that increases the bonding strength between the core halves and improves the reliability of the bonded state. It is intended to provide.

[Example 1 Hereinafter, details of the method of the present invention will be explained with reference to the drawings.

4 and 5 illustrate the method of the present invention. In the figures, the same or corresponding parts as in FIGS. 1 to 3 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, low melting point glass is preliminarily applied to the bonding surface 8.8 at the rear (back gap side) of the winding window 2 of each core block 1.3 by sputtering or the like to a thickness of l.
It is formed as an adhesive layer 9 with a thickness below ILm.

These core blocks 1.3 are moxibusted together as shown in FIG.
Insert and temporarily secure it.

Then, when heated while applying pressure, the adhesive layer 9. When the glass rod 5 is melted and cooled and solidified, the core block 1.3 is completely joined.

Subsequently, the core block is cut in the same manner as in the prior art to obtain a magnetic core as shown in FIG.

When using the method described above, an adhesive layer of low-melting glass is formed on the entire surface of the back gap side of the core, and this adhesive layer is melted and bonded, resulting in an extremely large bonding area and strong bonding strength. ,・The reliability of the bonding state can be significantly improved.

Note that since the thickness of the adhesive layer 9 is 1 gm or less, there is almost no increase in magnetic resistance due to the back gap.

[Effects] As is clear from the above description, according to the present invention, an adhesive layer of low melting glass is formed over the entire surface of the joint surface on the back gap side of the core blocks that are butted and integrated, Since a method is adopted in which a pair of core halves are joined by melting and solidifying this adhesive layer, the joining strength can be greatly improved, and the reliability of the joined form 7ai can be greatly improved.

[Brief explanation of the drawing]

Figures 1 to 3 explain the conventional method, and Figure 1 (
A) and (B) are perspective views of the core blocks that are butted together, FIG. 2 is a perspective view of the core blocks in the butted state, FIG. 3 is a perspective view of the magnetic core in the completed state, and FIG.
85 and 85 illustrate one embodiment of the present invention, FIG. 4 is a perspective view of the core blocks in abutted state, and FIG. 5 is a perspective view of the magnetic core in the completed state. 1.3...Core block 1a, 3a...Magnetic layer 1
b, 3b...High permeability magnetic material 2...Winding groove 4...Groove 5.6...Glass rod 7...Magnetic core 8...Joint surface
9... Adhesive layer Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a method for manufacturing a magnetic head that includes a step of abutting a pair of magnetic core halves and joining the two by melting and solidifying a glass material, a low melting point glass is applied over the entire abutting surface of the magnetic core halves on the back gap side. Forms an adhesive layer of
A method of manufacturing a magnetic head, characterized in that the adhesive layer is melted and solidified to join the pair of core halves.