JPH067404B2 - Magnetic head manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of manufacturing a magnetic head, and more particularly, to a magnetic material having a high magnetic permeability in a magnetic gap forming portion of a sliding surface of a magnetic recording medium via a non-magnetic material spacer. Of the center shim, and a method of manufacturing an erasing magnetic head including a ring-shaped magnetic core having magnetic gaps formed on both sides of the shim.

[Prior Art] FIGS. 4 and 5 show a conventional method of manufacturing a magnetic head of this type.
It will be described with reference to the drawings.

In FIG. 4, reference numeral 1 is the above-mentioned ring-shaped magnetic core. First, the ring core 1 is formed by bending an elongated rectangular plate made of a metal having high magnetic permeability into a ring shape as shown in the drawing.

However, the gap between the opposed end portions 1a, 1a forming the magnetic gap of the ring core 1 is made larger than the gap shown, and in this state, the bobbin 4 around which the winding 6 is wound next is fitted into the ring core 1. Terminals 5 and 5 to which both ends of a winding 6 are connected are planted in the bobbin 4.

Next, a force is applied to the tip portions 1a, 1a of the ring core 1 as indicated by an arrow to make the gap between the tip portions 1a, 1a predetermined.

Next, a center shim 2 made of a high-permeability material sandwiched by spacers 3 made of a non-magnetic material is sandwiched between the tip portions 1a, 1a, and then the center shim 2 and the spacer 3 are adhered, brazed or welded. Is fixed between the tip portions 1a, 1a to obtain a core unit indicated by reference numeral 8 in FIG.

Next, after the core unit 8 is fitted into a holder (not shown) and fixed, the tip end surface of the ring core 1 is ground together with the center shim 2 and the spacer 3 into a cylindrical shape as shown by the alternate long and short dash line in FIG. The medium sliding surface is formed to complete the magnetic head.

[Problems to be Solved by the Invention] However, according to the above-described manufacturing method, the center shim 2 is separate from the ring core 1 and the tip portions 1a, 1 of the ring core 1 are separated.
Since it is sandwiched between a, the center shim 2 is displaced in the width direction (vertical direction in the figure) with respect to the tip portions 1a, 1a of the ring core 1 as shown in FIG. As a result, there is a problem that the dimensional accuracy such as the track width and the track position deteriorates.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the method of manufacturing a magnetic head according to the present invention, the tips of the magnetic recording medium sliding surfaces that are arranged to face each other and form a magnetic gap are provided. Continuing on one side, a step of forming a ring-shaped magnetic core having a center shim forming member, bending the shim forming member, and sandwiching between the tip end portions of the core via a non-magnetic material spacer, A structure having a step of fixing and a step of removing the bent portion by grinding or the like to form the sliding surface is adopted.

[Operation] According to such a configuration, the center shim forming member is initially continuous with the ring core tip portion, that is, is integral with each other. Therefore, when the shim forming member is bent or pinched, the positional deviation from the core tip portion is prevented. It does not occur at least for the core tip on the integral side.

[Embodiment] Hereinafter, details of an embodiment of the present invention will be described with reference to Figs. Here, the method of manufacturing an erasing magnetic head of the same type as that of the above-mentioned conventional example is used as an example.
In FIGS. 3 to 3, the same parts as those in FIGS. 4 to 6 are designated by the same reference numerals.

In the manufacturing method of this embodiment, first, the ring core 1 shown in FIG. 1 is formed by bending an elongated rectangular plate made of a metal having a high magnetic permeability into a ring shape. However, in this embodiment,
A center shim forming portion (hereinafter abbreviated as a shim forming portion) 7 to be a center shim later is formed continuously with one of the end portions 1a forming the magnetic gap of the ring core 1, that is, integrally with the ring core 1. Further, the shim forming portion 7 is formed on the outer surface of the base end portion with a predetermined depth and width over the entire width of the shim forming portion 7 later. Since the shim forming portion 7 is integral with the ring core 1, it is of course made of a high magnetic permeability material.

Next, the bobbin 4 is fitted into the ring core 1 as in the case of the conventional example.

Subsequently, the shim forming portion 7 is sandwiched by the spacer 3 made of the non-magnetic material described above, and then the shim forming portion 7 is formed at the groove 7a.
Is bent into a substantially U shape, and is folded back inside the tip portion 1a to be stacked.

Further, force is applied to the tip portions 1a, 1a of the ring core 1 to bring them closer to each other, and the shim forming portion 7 and the spacer 3 are sandwiched between the tip portions 1a, 1a as shown in FIG. The shim forming portion 7 and the spacer 3 are fixed between the tip portions 1a, 1a by welding or the like to obtain the core unit 8 shown in the figure.

Next, as in the case of the conventional example, the core unit 8 is fitted and fixed to a holder (not shown), and then the tip end surface of the ring core 1 is formed with the shim forming portion 7 and the spacer 3 as shown by the one-dot chain line in FIG.
At the same time, it is ground into a cylindrical shape, the bent portion of the shim forming portion 7 is removed, and the sliding surface of the magnetic recording medium is formed to complete the magnetic head.

According to the method as described above, since the shim forming portion 7 is continuous with the one tip portion 1a of the ring core 1, the tip portion 1
There is no positional deviation in the width direction with respect to the continuous tip portion 1a when it is sandwiched between a and 1a. Further, it is extremely easy to accurately overlap the tip 1a which is not continuous with the shim forming portion 7.

Therefore, as shown in FIG. 3 where the shim forming portion 7 is sandwiched and fixed, the shim forming portion 7 is attached to the tip portion 1 of the ring core 1.
There is no displacement in the width direction with respect to a and 1a. Therefore, the track width is not changed and the track position is not displaced, the track width and the track position are accurately determined, and the characteristics of the magnetic head are improved.

Further, according to the present embodiment, since the shim forming portion 7 is integrated with the ring core 1, the number of parts can be reduced and the manufacturing cost can be reduced as compared with the conventional separate body.

In the above structure, the ring core 1 is assumed to be integral as a whole, but a pair of core halves or a larger number of core constituent members may be combined to form a ring.

[Effects] As is apparent from the above description, in the method of manufacturing a magnetic head according to the present invention, the center of the magnetic recording medium is continuously formed at one of the tip ends of the magnetic recording medium, which are arranged to face each other and form a magnetic gap. A step of forming a ring-shaped magnetic core having a shim forming member, a step of bending the shim forming member, sandwiching and fixing the shim forming member between the tip end portions of the core through a non-magnetic material spacer, grinding, etc. By adopting a configuration having a step of removing the bent portion and forming the sliding surface by, the positional deviation between the center shim and the tip portion is prevented, and the dimensional accuracy such as the track width and the track position is improved, A magnetic head with excellent characteristics can be manufactured, and the number of parts can be reduced to reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 and FIG. 2 are perspective views illustrating a manufacturing process of a magnetic head according to an embodiment of the present invention, and FIG. 3 is an explanatory view of a center shim forming portion in FIG.
FIG. 4 and FIG. 5 are perspective views for explaining the conventional manufacturing process of the magnetic head, and FIG. 6 is an explanatory view of the position deviation of the center shim in FIG. 1 ... Ring core, 3 ... Spacer 4 ... Bobbin, 5 ... Terminal 6 ... Winding, 7 ... Center shim forming part 7a ... Groove

Claims (2)

[Claims] 1. A step of forming a ring-shaped magnetic core having a center shim forming member which is continuous with one of tip portions which are arranged to face each other on a sliding surface of a magnetic recording medium and form a magnetic gap, and the shim formation. A step of bending the member, sandwiching it between the tip portions of the core through a non-magnetic material spacer, and fixing;
A method of manufacturing a magnetic head, comprising a step of removing the bent portion by grinding or the like to form the sliding surface. 2. The method according to claim 1, further comprising the step of previously forming a groove in the bent portion of the shim forming member.
A method of manufacturing a magnetic head according to the item 1.