JPH0462126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of manufacturing a magnetic head suitable for application to, for example, a magnetic head for erasing. In the conventional erasing magnetic head, for example, as shown in FIG. 1A, a groove 1a into which a center core 2 fits is formed in the center of a side core 1 having a C-shaped cross section, and a recessed step 1b for gap formation is formed on both sides of the groove 1a. Figure B
As shown in FIG. 2, the center core 2 is inserted, and the molten glass 3 is poured into the gap created between the center core 2 and the recessed step portion 1b and fixed. After solidifying the glass 3, the side core 1 and center core 2
The integral part (dimension a) is separated from unnecessary parts and is obtained through a polishing process. On the other hand, as shown in FIG. 2A, the center core 6 is butted against the left and right side cores 4 and 5, and the center core
A concave stepped portion 4 for forming a gap formed on the surface facing the
Glass 3 is poured into the gap formed by a and 5a (see B in the same figure), and a magnetic head is formed in substantially the same manner as described above. Incidentally, the dimension b indicates the portion that becomes the magnetic head in the example shown in FIG.

However, the above method causes variations in gap dimensions. That is, if an oxide magnetic material is used as the material for each core, the dimensions at the time of gap cutting and the dimensions at the time of pouring the molten glass will be inconsistent due to deformation over time or warping that occurs during the high temperature heat treatment process. For example, if a gap of 50 μm is required, there will be an error of up to ±25 to 30 μm.
It greatly affects the quality of the product. Also, in the case of the example in Figure 2, when filling molten glass, a defoaming agent is used, but this creates void bubbles that penetrate into the oxide material, and these bubbles stay inside, causing the glass to deteriorate. This has the disadvantage that the quality of the magnetic head is degraded. In addition, since the proportion of the material is large and the majority of the material is removed, there is also a disadvantage in terms of cost.

In view of the above, the main object of the present invention is to provide an inexpensive magnetic head with a structure that reduces variations in gap dimensions and gap depth, and by significantly reducing the amount of materials used in conventional manufacturing methods. .

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 shows an example of a material 10 for a magnetic head, and unlike the conventional method, the side cores and center core are cut out from this material all at once. That is, the side core 1 is moved in the longitudinal direction from the bottom of the material 10.
The head gap slits 11 for dividing 0a, 10b and center core 10c are shown at 2 in the figure.
As shown by the dotted chain line, the concave surface is formed by cutting until it reaches the bottom of the slit 11 to facilitate division of each core from the upper part of the material 10 and to allow air bubbles to escape. 12 (see Figure 4). in this case,
Instead of the cut concave surface 12, the slit 11 can be formed using a material in which a concave portion 12' similar to the cut concave surface 12 has been formed in advance, as shown in FIG.
The concave surface 12 extends in the direction of slit extension of the material 10 (arrow A
Each core 10a, 10 is
The portions b and 10c are still integrated as the material 10 despite the presence of the slit 11. The width of the slit 11 depends on the dimensional accuracy caused by the run-out of the cutting edge during slitting, but it is usually within a range of about ±15 μm, so it can sufficiently cope with gap formation dimensions of, for example, 50 μm. The state after slit processing and concave processing is shown in FIG.

Next, the left and right gaps of the unseparated and integrated materials are filled with molten glass 13 for bonding in a furnace. At this time, bubbles are generated due to the structure of the material and the glass material, but the bubbles generated in the glass part penetrate the center of the slit 11 due to the presence of the concave surface 12, so they do not stay at the bottom of the slit. There is no such thing, and it ends up being lost to the outside.

Incidentally, as shown in FIG. 5, the slit 11 can be provided with a V-shaped slit 11a that has a gap depth d and is opened at an angle with respect to the vertical plane of the center core 10c.

As shown in FIG. 6, both ends 10d, 10
By deleting e, each core 10a, 10b, 10c is divided by the bonding material 13 and integrated into the glass 13, so the upper surface can be further polished and used as a sliding surface for a tape or the like. can.

As described above, according to the present invention, the slits that divide both side cores and the center core are formed in the magnetic head material without separating them individually, and the slits other than both ends in the extending direction of the slits are removed from the opposite direction of the slit forming surface. Penetrate the center of the slit, fill the slit with a non-magnetic bonding material, grind or cut both ends, and use the non-magnetic bonding agent to form a surface where both side cores and the center core are divided into a sliding surface. As a result, it is possible to minimize variations in gap dimensions compared to the conventional method of manufacturing each core and then joining them with a bonding material. Since the parts are transferred all at once without being separated, parts management can be simplified. Furthermore, in the past, material was required that functioned only to secure the gap width and did not become a product, resulting in poor material yield, but according to the present invention, it is sufficient to secure the minimum length at both ends of the slit in the extending direction, and the material The amount of removed parts is extremely reduced and the material yield is improved.

Further, according to the present invention, slits for dividing both side cores and the center core are formed in the magnetic head material, which is previously formed into a concave shape except for both ends in the longitudinal direction of the tape sliding surface, without separating them individually. After penetrating the center part and filling the slit of the head material with a non-magnetic bonding material, both ends are ground or cut, and the surface where both side cores and the center core are divided is formed into a sliding surface via the non-magnetic bonding material. Therefore, the same effects as the above invention can be achieved.

[Brief explanation of the drawing]

1A, B and 2A, B are perspective views for explaining the conventional method, FIGS. 3, 4, and 6 are perspective views for explaining the process of the present invention, and FIG. 5 FIG. 3 is a perspective view showing another example. 10...Magnetic head material, 10a, 10b...
Side core, 10c... Center core, 10d, 1
0e... Both ends in the slit extension direction, 11... Slit, 12... Cutting concave surface, 12'... Concave portion.

Claims (1)

[Scope of Claims] 1. Slits dividing both side cores and a center core, respectively, are formed in a magnetic head material without separating them individually, and the slits are formed by removing other than both ends in the direction of extension of the slit from the opposite direction of the slit forming surface. After penetrating the center of the slit and filling the slit with a non-magnetic bonding material, both ends are ground or cut, and the surface where both side cores and the center core are divided via the non-magnetic bonding material is used as a sliding surface. A method of manufacturing a magnetic head characterized by: 2. Forming slits for dividing both side cores and the center core, respectively, into a magnetic head material which is previously formed into a concave shape except for both ends in the longitudinal direction of the tape sliding surface without separating them individually, and penetrating the central part of the slit, After the slit of the head material is filled with a non-magnetic bonding material, both ends thereof are ground or cut, and the surface where both side cores and the center core are divided via the non-magnetic bonding material is used as a sliding surface. A method of manufacturing a magnetic head.