JPS59146424A - Magnetic head core and its production - Google Patents

Abstract

PURPOSE:To avoid exfoliation of the laminated members during a manufacturing process and to keep a fixed magnetic gap width constant to increase the strength of a magnetic head core, by forming previously the grooves for thin plate magnetic material to a block of a nonmagnetic material with prescribed pitches and then putting the thin plate magnetic material into those grooves. CONSTITUTION:Plural grooves 10 are formed in parallel to the single side of a block 1 made of a nonmagnetic material with prescribed pitches. Then thin plate magnetic mateial 2 is put into these grooves 10 via an adhesive, etc. The block 9 is cut in the lengthwise direction of the grooves 10 as shown by broken lines to obtain a core block half. Then a nonmagnetic material is attached to the areas of a junction surface 14 or 15 and 16 or 13-15 respectively by the vapor deposition or sputtering process. Then the blocks which are set opposite to each other centering on the material 2 and joined together at the center part in the thickness direction of the material 2 are cut to obtain a single magnetic core body 16.

Description

Detailed Description of the Invention Technical Field The present invention relates to a magnetic head core and a method of manufacturing the same, and more particularly to a narrow track magnetic head core formed from a metallic magnetic material such as sendust or amorphous, and a method of manufacturing the same. It is.

Prior Art A conventional method for manufacturing this type of magnetic head core is shown in FIGS. 1 to 5.

First, as shown in FIG. 1, a plurality of layers are formed so that a thin plate magnetic material 2 is present between non-magnetic materials 1, 1, and the gaps are fixed with adhesive.

Thereafter, the laminated block 3 as shown in FIG. 2 is obtained by cutting it into a predetermined size as shown by the broken line in FIG. 1. Thereafter, the winding grooves 4 are formed in a continuous state in this laminated block as shown in FIG. 3, and the abutting surfaces 6,
7 is flat-finished to obtain a laminated core opposite block 5.

Next, a non-magnetic material is deposited by vapor deposition or sputtering to obtain a predetermined gap width only on the abutting surfaces 6, 7, or 6 of the core-opposite block 5, and as shown in FIG. The two core-opposite blocks are bonded with an adhesive in a state where they are arranged in correspondence so that there is no one-to-one discrepancy.

Next, this joined block is cut from approximately the center of the thickness of the non-magnetic material 1 sandwiching the thin magnetic material 2 as shown by the broken line in FIG.
A single magnetic core 8 is obtained. Note that the reference numeral 8a indicates a magnetic gap.

By the way, in the magnetic core formed as described above, the non-magnetic phases 1 and 1 and the thin plate magnetic material 2 are only bonded with adhesive or the like, so the magnetic core is shown in FIG. 2 or 3. When processed into a block, the non-magnetic material 1 and the thin magnetic material 2 peel off from the bonded portion, resulting in an extremely poor manufacturing yield.

Furthermore, as shown in Fig. 4, in the conventional structure, adhesive is applied to the abutting surfaces of the core half blocks, or adhesive is applied to the inner surface of the winding window 4. Because of this, there were problems such as the width of the magnetic gap 8a being unstable and the adhesive strength being weak.

Purpose The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and it is possible to prevent the peeling of laminated members during the manufacturing process, make the magnetic gap width constant, and increase the strength. The present invention aims to provide a magnetic head core and a method for manufacturing the same.

EXAMPLES The present invention will be described in detail below based on examples shown in the drawings.

6 to 10 illustrate a method of manufacturing a magnetic head core to which the present invention is applied. In the present invention, a block 9 of non-magnetic material is first prepared. A plurality of parallel grooves 10 into which the thin magnetic material 2 is fitted are formed at predetermined intervals on one side of the block 9.

Then, the thin plate magnetic material 2 is fitted and fixed into each groove 10 via an adhesive or the like.

Thereafter, the grooves 10 are cut at predetermined intervals along the longitudinal direction as shown by broken lines in FIG. 6 to obtain half core blocks 9a as shown in FIG.

Next, an adhesive groove 11 is formed on one side of the core block half 9a in a portion away from the thin plate magnetic material 2. Subsequently, the winding groove 12 is cut in the area where the thin plate magnetic material 2 is present, and the bonding surfaces 13 to 15 are finished flat.

After that, the joint surface 14, or 14.15, or 13
A non-magnetic material is deposited on the portions 15 to 15 by vapor deposition or sputtering.

Next, as shown in FIG. 9, core block halves 9b and 9a formed in the same manner are butted and joined to form a magnetic gap 8a having a predetermined width. In this case, the bonding is performed by applying or injecting an adhesive onto the inner surface of the winding groove 19 and the adhesive groove 11.

Next, as shown by the broken line in FIG. 9, the joined block is cut from the center in the thickness direction of the non-magnetic material 1 located across the thin magnetic material 2, and the magnetic core is cut as shown in FIG. Obtain single unit 16.

Since the magnetic core obtained by the method of the present invention has continuous non-magnetic material sandwiching the thin magnetic material 2, it is not laminated over the entire surface as in the conventional method, and peeling between the layers may occur due to insufficient adhesive strength. It never happens.

Furthermore, since the core block halves 9a and 9b are bonded together by applying or injecting adhesive to the inner peripheral surfaces of the adhesive groove 11 and the winding groove 12, the adhesive does not flow into the magnetic gap 8a. It can be prevented. For this reason, the magnetic gap 8
Since the gap width a is determined only by the thickness of the non-magnetic material applied to the bonding surface, there is no variation in the gap width.

Furthermore, as shown in FIG. 6, since the block 9 has grooves 10 formed in advance at predetermined intervals, the core block halves 9a, 9b, etc. obtained by cutting the block 9, have the thin magnetic material 2 in the grooves 10. Because they are arranged at the same pitch, which is only affected by the processing accuracy, no extraneous positioning work is required.

Effects As is clear from the above explanation, according to the present invention, grooves into which the thin magnetic material is fitted and fixed are formed in advance at a predetermined pitch in a block of non-magnetic material, and the thin magnetic material is fitted and fixed into these grooves. This structure prevents peeling between the thin magnetic material and non-magnetic material during the manufacturing process, making it possible to keep the width of the magnetic cap constant and increase strength.

[Brief explanation of the drawing]

1 to 5 are manufacturing process diagrams illustrating a conventional method for manufacturing a magnetic head core, and FIGS. 6 to 10 are manufacturing process diagrams illustrating a method for manufacturing a magnetic head core according to the method of the present invention. 2... Thin magnetic material 9... Block 9a of non-magnetic material
, 9b... Core block half body 10... Groove 11...
・Adhesive groove 12...Winding groove 13-15...Joining 16...Magnetic core alone Figure 1 Figure 2 Figure 3 Figure 4 Figure 1 51! A Figure 6 Figure 7

Claims (2)

[Claims] (1) A groove into which the base magnetic material fits is provided on one end side of a block made of non-magnetic material, and the opposite sides of the cores with winding grooves and adhesive grooves formed on the abutting surfaces of the blocks are butted, and the winding grooves and adhesive grooves are A magnetic head core characterized in that core halves are integrated by applying or filling an adhesive. (2) A thin magnetic material is bonded and fixed in grooves formed at a predetermined pitch on the side surface of a block made of non-magnetic material, and then cut at predetermined intervals along the longitudinal direction of the groove to obtain a core block half. a step of forming a winding groove and an adhesive groove on the abutting surfaces of the core block halves, a step of forming a non-magnetic material layer at least in the magnetic gap portion of the abutting surfaces, and a step of butting these core half blocks. A method for manufacturing a magnetic head core, comprising the steps of integrating the blocks by applying or filling an adhesive into the winding groove and the adhesive groove, and cutting the integrated blocks at predetermined intervals. .