JPH0724092B2 - Method of manufacturing magnetic head - Google Patents

Description

The present invention relates to a magnetic head for high-density magnetic recording / reproduction.

[Conventional technology]

Conventionally, when manufacturing a magnetic head, for example, as shown in FIG. 5A, first, an inner winding groove 2, an outer winding groove 3, and a plurality of track grooves are formed on a long core 1 made of a magnetic material. 4 ... is provided, and now 1 shown in FIG.
External winding groove 6, multiple track grooves 7, 7, ...
And the reinforcing groove 8 is formed.

Next, after the gap facing surfaces 9 and 10 of each core 1.5 are mirror-polished, as shown in FIG.
Are welded to each other with glass (not shown) at a predetermined gap 11. Then, the tape sliding is performed while controlling the depth c of the gap 11, that is, the distance between the mating portion of the tape sliding surfaces 12 and 13 of each core 1 and 5 and the upper end of the inner winding groove 2 of the core 1. A plurality of magnetic heads as shown in FIG. 7 are obtained by polishing the surfaces 12 and 13 into a curved surface to give a curvature, and then cutting the cores 1 and 5 along a surface perpendicular to the longitudinal direction. Get 14

[Problems to be solved by the invention]

By the way, in the above-described magnetic head manufacturing method,
The depth c of the gap 11 is measured from the surface A in FIG. 6, and this surface A has a step due to the displacement of the cores 1 and 5 when the two cores 1 and 5 are welded. In some cases,
Since the glass used for welding the cores 1 and 5 may overflow into the area of the gap 11 on the surface A, there is a problem that it is difficult to accurately measure and control the depth c of the gap 11.

Also, while the mating portion of the tape sliding surfaces 12 and 13 that is the upper end of the gap 11 is measured as a line, the upper end of the inner winding groove 2 that is the lower end of the gap 11 is measured as a point, so it is accurate. It becomes more difficult to measure the depth c of the large gap 11. As described above, since the depth c of the gap 11 cannot be accurately controlled, the production yield of the magnetic head 14 is deteriorated.

[Means for solving problems]

In order to solve the above problems, a method of manufacturing a magnetic head according to the present invention includes a step of polishing a tape sliding surface into a curved surface while setting a depth of a gap. , The following measures are taken.

That is, it is made of a magnetic material and faces each other across a gap.
One of the two cores, which has no internal winding groove, extends in advance from the tape sliding surface to the position corresponding to the internal winding groove of the mating core, and penetrates from the outer wall surface to the gap facing surface. The groove is formed in advance, and the tape sliding surface is polished while actually measuring the depth of the gap through the groove.

[Work]

According to the above method, it becomes possible to measure the depth of the gap at a portion which is not affected by the glass used for welding the two cores, and the tape sliding surface and the internal take-up groove are both formed as lines. You will be able to measure.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

When manufacturing a magnetic head, first, as shown in FIG. 1 (a), one core 15 made of a magnetic material such as an oxide or an alloy is provided with an inner winding groove 16 and an outer winding as in the conventional example. Wire groove
17 and a plurality of track grooves 18, 18 ... Are provided, and as shown in FIG. 1 (b), one core 19 made of a magnetic material corresponds to the outer winding groove 20, the track grooves 18, 18 ,. .. and the reinforcing groove 22 are formed.

Further, the core 19 on the side where the internal winding groove is not provided is further provided with grooves 23 and 24 for measuring depths a and b of a gap 27 described later.
To provide. These grooves 23 and 24 extend from a tape running surface 30 of the core 19 described later to a depth corresponding to the internal winding groove 16 of the counterpart core 15, and will be described later from the surface provided with the external winding groove 20. It has a size in the width direction reaching the gap facing surface 26.

Next, after the gap facing surfaces 25 and 26 of the two cores 15 and 19 are mirror-polished, as shown in FIG.
Are joined together by a predetermined gap 27 and are joined together by molten glass (not shown) or the like. Subsequently, the depths a and b of the gap 27 shown in FIG. 3, that is, the distance between the mating portion of the tape running surfaces 28 and 30 of the cores 15 and 19 and the upper end of the inner winding groove 16 of the core 15. Is measured through the grooves 23 and 24, and the tape running surfaces 28 and 30 are polished into curved surfaces while controlling the depths a and b of the gap 27 to be predetermined values. In this case, the tape running surface 28, which is the top of the gap 27
.30 mating parts and internal winding groove 16 at the bottom of the gap 27
The upper end of is measured together as a line. After that, the integrated cores 15 and 19 are cut along a plane perpendicular to the longitudinal direction to obtain a plurality of magnetic heads 31 as shown in FIG.

The groove 23 for measuring the depth a / b of the gap 27
The number and width of 24 can be arbitrarily changed.

〔The invention's effect〕

The method of manufacturing a magnetic head according to the present invention, as described above,
Of the two cores made of magnetic material that face each other across the gap, extend from the tape sliding surface to the position corresponding to the internal winding groove of the mating core in advance on the core without the internal winding groove. In addition, a groove is formed so as to penetrate from the outer wall surface to the gap facing surface, and the tape sliding surface is polished while actually measuring the depth of the gap through the groove.

This makes it possible to measure the depth of the gap in the area that is not affected by the glass used for welding the two cores, and also to actually measure both the tape sliding surface and the internal winding groove as lines. Therefore, the gap depth can be accurately measured and adjusted. as a result,
There is an effect that recording and reproduction by the magnetic head can be performed more accurately. Further, since the depth of the gap can be adjusted accurately, the manufacturing yield of the magnetic head is improved.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIGS. 1 (a) and 1 (b) are perspective views showing two cores, respectively, and FIG. 2 shows two cores joined together. FIG. 3 is a front view showing a state in which two cores are joined, FIG. 4 is a perspective view of a magnetic head, and FIGS. 5 to 7 show conventional examples. 5 (a) and 5 (b) are perspective views showing two cores respectively, FIG. 6 is a perspective view showing a state in which the two cores are joined, and FIG. 7 is a perspective view of the magnetic head. 15 and 19 are cores, 16 is an internal winding groove, 23 and 24 are grooves, 27 is a gap, 28 and 30 are tape running surfaces, and 31 is a magnetic head.

Claims (1)

[Claims] 1. A method of manufacturing a magnetic head including a step of polishing a tape sliding surface into a curved shape while setting a depth amount of a gap, wherein two cores made of a magnetic material and facing each other across a gap are provided. A groove that extends from the tape sliding surface to the position corresponding to the internal winding groove of the mating core in advance on the core on the side where the internal winding groove is not provided and that penetrates from the outer wall surface to the gap facing surface is provided. It is characterized in that the tape sliding surface is polished while actually measuring the depth of the gap through the groove with both the tape sliding surface and the internal winding groove as lines. Magnetic head manufacturing method.