JPS6338766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic head suitable for use in obtaining a magnetic head with a narrow track width.

Magnetic heads are generally required to have high sensitivity, low noise, and wear resistance over a wide frequency band. However, in practice, a magnetic head that satisfies all of these characteristics has not been obtained. For example, in the case of ferrite heads, although they have excellent high frequency characteristics and wear resistance, they have a low saturation magnetic flux density, and as a magnetic recording medium, even if a magnetic medium with high coercive force was used, it was not possible to achieve high density recording. There are disadvantages in that sensitivity cannot be obtained and sliding noise is relatively large. Furthermore, alloy heads such as Sendust have a high saturation magnetic flux density and low sliding noise, but are inferior in high frequency characteristics and wear resistance. In contrast, in recent years, amorphous alloys, such as cobalt (Co)-iron (Fe)-boron (B)-carbon (C) alloys, have been developed to achieve high magnetic flux densities and An alloy with low noise and high hardness (Vickers hardness of about 900), that is, excellent wear resistance, has a relatively large resistivity, and has excellent high frequency characteristics. However, when this amorphous alloy is heated to a high temperature, unstable crystallization progresses, leading to deterioration of properties. Therefore, when manufacturing a magnetic head using this type of amorphous alloy, it is necessary to avoid processing under high temperature heating during the manufacturing process, and there are limitations in processing and manufacturing, especially for narrow track widths. A drawback is that it is difficult to manufacture magnetic heads efficiently and with a high yield.

The present invention provides a method for manufacturing a magnetic head that can easily and mass-produce a magnetic head with a narrow track width using various magnetic materials, such as amorphous alloys with poor workability such as those described above. It is something to do.

An embodiment of the manufacturing method of the present invention will be described with reference to FIGS. 1 to 5.

In the present invention, as shown in FIG. 1, a pair of non-magnetic guard materials 1 and 2 are prepared, and a block 4 is constructed by laminating them together and fixing them with a magnetic thin plate 3 interposed between them. The non-magnetic guard materials 1 and 2 may be made of a plate-like material having excellent wear resistance, such as non-magnetic ferrite, for example Zn ferrite, or ceramic. These non-magnetic guard materials 1 and 2 are shaped or cut out so that the surfaces facing each other and the opposite surface have high parallelism and flatness. The magnetic thin plate 3 is composed of a single thin plate or a plurality of laminated thin plates, and the overall thickness is selected to correspond to the track width of the magnetic head to be finally obtained. This magnetic thin plate 3 can be, for example, a Co-Fe-B-C based amorphous alloy thin plate, and this amorphous alloy thin plate is
Since it is manufactured as a thin plate by a normal manufacturing method, it is convenient to use it as the magnetic thin plate 3, but the magnetic thin plate 3 is not limited to this amorphous magnetic alloy thin plate. In addition, guard materials 1 and 2
and the magnetic thin plate 3, for example, by applying an organic adhesive to the joint surfaces of the guard materials 1 and 2 with the magnetic thin plate 3, and placing the magnetic thin plate 3 between the guard materials 1 and 2 and the magnetic thin plate 3.
Both guard materials 1 and 2 are sandwiched and stacked together.
A predetermined load is applied from the outside to bond the three parts together.

This block 4 is indicated by the dashed line a in FIGS. 1A and B.
As shown with, each guard material 1 and 2,
As shown in FIG.
It is divided into two or more divided blocks 5.

Then, these divided blocks 5 are combined into pairs of blocks 5, and the divided blocks 5 of each group are brought together with their cut sides facing each other. Here, the opposing side surfaces 5a and 5b of each divided block 5 are assumed to be surfaces with excellent parallelism and flatness.

As shown in FIG. 3, at least one of the divided blocks 5 of the pair has an abutting surface with the other block 5, that is, for example, a side surface 5a.
A groove extending in a direction substantially perpendicular to the magnetic thin plate 3 is formed in the magnetic thin plate 3. This groove defines the depth of the final magnetic gap of the magnetic head, and
A winding groove 6 for winding the winding wire, an adhesive filling groove 7 provided on one side of the groove as necessary, and a pair of grooves 6 and 7 provided on both outer sides between each pair. It consists of a reference groove 8.

Then, as shown in FIG. 4, the paired divided blocks 5 are combined by abutting the side surface 5a provided with the grooves 6, 7 and 8 against the side surface 5b of the other divided block 5. These two blocks 5 are combined so that the end faces of the respective magnetic thin plates 3 facing the abutting sides 5a and 5b abut each other, and the magnetic thin plates 3 of both blocks 5 extend in the same plane. . Also,
These pairs of divided blocks 5 are joined together by filling the grooves 7 with an adhesive 9. This adhesive 9 is used to fill the groove 7 and to fill both blocks 5.
The adhesion temperature for adhesion, that is, curing, is
An organic,
Or use an inorganic adhesive.

In addition, before this pair of split blocks 5 are combined, a spacer is formed with a thickness to define the gap between the abutting end surfaces of the magnetic thin plates 3 of both blocks 5, that is, the magnetic gap length. Non-magnetic e.g.
Side surfaces 5a and 5b where _two SiO layers are butted against each other
, particularly between the winding groove 6 and the reference groove 8, by vapor deposition, sputtering, or the like.

The combined block 10 obtained by combining the pair of divided blocks in this manner is shown by the dashed line b in FIGS. Then, as shown in FIG. 4B and C, sandwich the magnetic thin plate 3 so that both upper and lower outer surfaces thereof are along the longitudinal direction of the block 10 and parallel to the magnetic thin plate 3. Cut it to the required thickness. Then, as shown by the chain line d in FIGS. 4A and 4B, the adjacent winding grooves 6 and the adhesive 9 filling grooves 7 are set as a set, and the blocks 10 are set in the reference grooves 8 between each set. A plurality of magnetic heads 11 shown in FIG. 5 are cut out from the block 10 by dividing it along a plane substantially perpendicular to the longitudinal direction and the magnetic thin plate 3. This magnetic head 11 is
A surface 12 that contacts the magnetic medium is polished and formed. The surface 12 in contact with the magnetic medium may be formed into an arcuate surface substantially perpendicular to the magnetic thin plate 3 on the opposite side of the winding groove 6 to the adhesive-filled groove 7 .

In this way, the pair of magnetic cores 13A and 13B, which are each made up of a portion of the pair of magnetic thin plates 3, are butted against each other, and the depth between the surface 12 in contact with the magnetic medium and the winding groove 6 is A magnetic head 11 is obtained in which a magnetic gap g is defined. A winding 14 is wound in the winding groove 6 .

In the magnetic head constructed in this way, the pair of magnetic cores 13A and 13B are constructed of the magnetic thin plate 3, and the track width is the same as that of the magnetic thin plate 3.
The track width is determined by the thickness of a single magnetic thin plate constituting the magnetic thin plate 3 or the total thickness of the laminated magnetic thin plates, so the track width can be set to be sufficiently small. core 1
Although the cores 3A and 13B are sufficiently thin, these cores 13A and 13B have a core retainer 1 made of a portion of each of the non-magnetic guard materials 1 and 2.
Since the cores 13A and 13B are sandwiched between the cores 5A and 15B, they are mechanically reinforced by the core retainers 15A and 15B, and the mechanical strength is maintained sufficiently.

According to the above-mentioned manufacturing method of the present invention, the magnetic thin plate 3, which will eventually constitute the magnetic core of the magnetic head, is sandwiched between the non-magnetic guard materials 1 and 2, and then the magnetic head is obtained. Therefore, even when using an amorphous alloy with poor workability as a magnetic material, it is possible to process it without changing the properties of the magnetic material without using processing methods such as processing at relatively high temperatures. can be carried out reliably, and magnetic heads with good characteristics can be obtained at a high yield.

As described above, according to the manufacturing method of the present invention, a magnetic head with a narrow track width can be obtained by using an amorphous alloy magnetic material with poor workability. The magnetic head 11 obtained using the -C-based amorphous alloy has high wear resistance and excellent frequency characteristics. FIG. 6 shows head output-frequency characteristics of a magnetic head made of this amorphous alloy and a conventional ferrite magnetic head. In this case, the relative speed between the magnetic head and the magnetic medium is 10 m/
In the case of selecting seconds, the solid line curve 16 in Fig. 6
is the dashed curve 17 for an amorphous alloy magnetic head.
This applies to a ferrite magnetic head, and an amorphous alloy magnetic head provides high output at 1 to 5 MHz.

In the above example, the pair of divided blocks 5 are joined together by adhesively filling the groove 7 with the adhesive 9, but in some cases, both blocks are combined without providing the groove 7. 5 butting side 5a,
5b, the above-mentioned adhesive 9 is applied to the part other than the part constituting the operating magnetic gap g on the front side of the magnetic head finally obtained, that is, the part other than the part on the front side of the winding groove 6, for example, the rear gap part. In addition to the above-mentioned example, various modifications and changes can be made in the details, for example, the blocks 5 of the pair can be glued together.

[Brief explanation of the drawing]

1 to 5 are process diagrams showing one embodiment of the method for manufacturing a magnetic head according to the present invention, each figure A is an enlarged top view, each figure B is an enlarged side view, and FIGS. 1 and 4 respectively. Each figure C is an enlarged front view, and FIG. 6 is a frequency characteristic curve diagram. 1 and 2 are non-magnetic guard materials, 3 is a magnetic thin plate, 4
is a block, 5 is a divided block, 6 is a winding groove, 7
8 is a groove for filling adhesive, 8 is a reference groove for position regulation, 10 is a groove for filling adhesive.
is a combined block, 13A and 13B are magnetic cores,
g is the magnetic gap.

Claims (1)

[Claims] 1. A step of forming a block in which a magnetic thin plate is fixed between a pair of non-magnetic guard materials, a step of dividing the block in a direction perpendicular to the surface of the magnetic thin plate to obtain at least two divided blocks, and a step of obtaining at least two divided blocks; forming a groove extending substantially perpendicularly to the magnetic thin plate in at least one of the divided blocks; and joining the two divided blocks via a required gear spacer so that the end faces of the respective magnetic thin plates face each other. 1. A method for manufacturing a magnetic head, comprising the steps of: forming a contact surface with a magnetic medium so as to have a required gap depth from the groove;