JPS6224413A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To simplify the process and to improve productivity by welding glass materials both on one side surface of a magnetic head core and on a groove formed along the joint of a pair of core halves on the other side surface. CONSTITUTION:The titled head is mainly constructed with the low melting point glass material 4 welded on one side surface 3 of the magnetic head core 2 and the glass material 7 filled in the groove 6 formed on the other side surface 5 of the magnetic head core 2. In terms of the magnetic head core 2, magnetic head core halves 2a and 2b with high saturation flux density are jointed through a high melting point gap material to form a gap part 8 having an azimuth angle. Moreover, the magnetic head core 2 is machined into an extremely thin plate to reduce a current loss in a high frequency, and is reinforced with the glass material 4 welded on the entire surface of the side surface 3, thereby preventing the core from being damaged easily. Furthermore the glass materials 4 and 7 are welded on both surfaces of the gap part 8 along the joint part of a pair of magnetic head cores 2a and 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head and a method for manufacturing the same, and more particularly to a magnetic head and a method for manufacturing the same which allow the magnetic head core to be made thinner with precision and which are suitable for mass production.

2. Description of the Related Art It is generally known that magnetic heads can perform higher-density magnetic recording as the thickness of the magnetic head core becomes narrower. Therefore, in order to increase the density of magnetic recording, the magnetic head core has conventionally been formed from a thin metal magnetic plate with a high saturation magnetic flux density and a small thickness, and in addition to reducing manufacturing costs, it has also been made easy to mass produce in order to meet demand. There was a demand for a magnetic head with a shape that could be used.

As a conventional magnetic head, for example, as shown in FIG.
~Processed into a predetermined core half 31a.

A glass welding type magnetic head 33 is obtained by forming a cock of 31b, joining the blocks of 1 ta. 1 core half 318. There is. Further, as another magnetic head, as shown in FIG. 11, predetermined core halves 34a, 34b
After joining the blocks of a pair of core halves 34a and 34b processed into the shape of
After polishing the other side of the core 34 to have a thickness equal to the track width, a reinforcing material 36 is attached to the other polished side.
There is a laminate type magnetic head 37 in which a core 34 is laminated and both sides of a core 34 are sandwiched between reinforcements 035 and 36.

Problems to be Solved by the Invention However, in the case of the old conventional magnetic head 33 having the above structure, although it is excellent in mass production, the thickness of the core 31 is relatively large, so the frequency is high. This has the drawback of generating eddy currents and increasing core loss.

In the case of the latter conventional magnetic head 37, the core 34 is polished extremely thin, resulting in low eddy current loss and high output at high frequencies. Since it is necessary to bond the reinforcing plates 35 and 36, there is a drawback that it is time-consuming, has low productivity, and is not suitable for mass production.

Therefore, an object of the present invention is to provide a magnetic head that eliminates the above-mentioned drawbacks.

Means and Effects for Solving the Problem The present invention involves welding a glass material to one side surface of a magnetic head core formed by joining a pair of core halves made of thin plate-like magnetic material, and then bonding a glass material to the other side surface of the magnetic head core. By welding a glass material to a groove formed along the joint of a pair of core halves to form a thin magnetic head core, the manufacturing process is reduced to 1! l
This is simplified to improve productivity and make it suitable for mass production, and to suppress melt current loss at high frequencies.

EMBODIMENT OF THE INVENTION An embodiment of the magnetic head according to the present invention is shown in FIGS. 1A and 1B. In both figures, the magnetic head 1 is a magnetic head core 2 (magnetic head core half 2a).

2b), a low melting point glass material 4 welded to one side surface 3 of the magnetic head core 2, and a glass material 7 filled in a groove 6 formed on the other side surface 5 of the magnetic head core 2.
It is roughly composed of:

The magnetic head core 2 includes magnetic head core halves 2a and 2b made of, for example, Sendust, which have a high saturation magnetic flux density, and are joined together via a gap material having a high melting point, and a gap portion 8 having an azimuth angle is formed. In addition, the magnetic head core 2
is cut into an extremely substrate-like shape, reducing melt current loss at high frequencies. Therefore, the magnetic head core 2 is compatible with high-density recording. Further, the magnetic head core 2 is reinforced by a glass material 4 welded to the entire surface of the side surface 3, thereby preventing it from being easily damaged.

Since 2m6 is provided along the joint where the pair of magnetic head core halves 2a and 2b are joined, the gear 11 lug portion 8
The track width dimension is made smaller than the thickness dimension of the magnetic head core 2, and is compatible with high-density recording. Further, since the glass material 4.7 is welded to both sides of the gap part 8 along the joint part of the pair of magnetic head cores 2a and 2b, the glass material 4.7 is welded to both sides of the gap part 8.
It is held and reinforced by.

Reference numeral 9 denotes an adhesive groove, which is filled with an adhesive glass material when joining the pair of magnetic head core halves 2a and 2b, and is provided at the joining portion of the magnetic head core 2. The pair of magnetic head core halves 2a and 2b are stably bonded together by welding of the glass material filled to the 90% and by melting the glass materials 4 and 7. 10a to 10c are grooves for winding the coil 11.

Although the shape of the head surface 2C of the magnetic head core 2 is asymmetrical in the 1-rack width direction, by selecting materials for the glass members 4 and 7 that have wear resistance comparable to that of the material of the magnetic head core 2. Uneven wear of the head surface 2C can be prevented. Further, the glass materials 4 and 7 are a pair of core halves 2a,
2b may peel off from the magnetic head core 2 due to heating during bonding.

In order to prevent this, the temperature is about the same as that of the material of the magnetic head core 2! Use a material with a tensile modulus.

Next, an embodiment of the method for manufacturing a magnetic head according to the present invention is illustrated in FIGS. 2 to 9. Refer to and explain. As shown in FIG. 2, track grooves are first formed on the lower surface 12a of a magnetic material block (hereinafter referred to as block) 12 made of Sendust and having a predetermined rectangular parallelepiped shape using a machining tool such as a slicing machine. In addition, in order to form the azimuth angle of the gap portion 8, each track groove (shallow groove 13 and deep groove 14) is formed in the vertical direction! The machining is performed at an angle of azimuth angle from the straight line.

The block 12 has shallow grooves 13 and deep grooves 14 having different depths formed at a predetermined interval equal to the track width.

That is, the block 12 has a shallow groove 13 whose depth is shallower than its upper surface 12a, and a deep groove 14 whose depth is deeper than its upper surface 12a.
are formed alternately. The protrusion 15 left between the shallow groove 13 and the deep groove 14 constitutes a gap 8 of the magnetic head core 2, as will be described later. That is, the upper surfaces 15a of the protrusions 15 are butted against each other, creating a gap between the upper surfaces 15a, and the protrusions 1
The thickness dimension of 5 is the track width. Shallow groove 13 and deep groove 1
4 have not reached the T surface +26 of block 12,
Connecting portions 17 are left between the metal plates 13, 14 and the lower surface 12d, which connect the protrusions 16 except the metal plates 13, 14, which become the magnetic head core 2.

Note that the blade or grindstone used to cut the block 12 cuts the metal 13 and 14 along the side surface of the magnetic head core 2, so that the distance between the shallow groove 13 and the deep groove 14 is made minute and has a high precision (e.g. (20μ or less) can be easily processed. Further, since the shallow grooves 13 and the deep grooves 14 are formed alternately, the protrusion height of the protrusion 15 is shortened, and the protrusion 15 is not easily damaged by cutting and machining erosion.

Therefore, the protrusion 15 having an extremely small track width
can be easily formed with high precision, making it suitable for mass production, stabilizing dimensional accuracy, and improving reliability.

Note that by slightly displacing the blade and cutting the matching grooves 13° and 14 twice, the thickness of the protrusion 15 can be precisely machined to any desired dimension.

Next, as shown in FIG. 3, each of the shallow grooves 13 and deep grooves 14 formed in the block 12 is filled with a gusset material 18 (shown in a matte pattern in the figure). By filling the glass material 18, the extremely thin protrusion 15 is reinforced with the glass material 18 welded to both sides and kept in a stable state without wobbling.

Next, as shown in FIG. 4, the block 12 in the state shown in FIG.
An inner groove 19 forming one of the adhesive grooves 9 is carved in the longitudinal direction of the upper surface 12a of A. Furthermore, an outer groove 20 that forms a groove 10b for winding the coil 11 is carved in parallel to the inner groove 19 on the lower surface 12d of the block 12A. As shown in FIG. 5, grooves 1Qa and 10C for winding the coil 11 in the longitudinal direction of the upper surface 12a and lower surface 12d of the block 12B.
An inner groove 21. Engraving 22 outside. Further, an inner groove 23 forming the other side of the adhesive groove 9 is carved in the longitudinal direction of the upper surface 12a of the block 12B.

Note that since the protrusion 15 is reinforced by being sandwiched on both sides by the glass material 18 filled in the shallow groove 13 and the deep groove 14, matching grooves 19, 20, 21, . No damage occurs when engraving 22°23.

Next, a gap material (silicon dioxide M:
S i 02 or aluminum oxide: △f! , 203
) is deposited by sputtering. Then, as shown in FIG. 6, the block 12 is inserted through the gap material.
The lower surface 12d of A and the F surface 12a of the block 12B are butted against each other. Note that the positions where the blocks 12A and 12B meet are at the shallow end of 13. Align the deep grooves 14 with H and accurately align their joint positions. do. Further, the pair of blocks 12A and 12B are butted together so that the iM 19 of the block 12A and the iM 23 of the block 12B face each other.

Further, as shown in FIG. 7, a pair of blocks 12A, 1
With 2B butted together, groove 21 and groove 19.2 of the joint part.
111 rod-shaped glass 'vJ24°25 are placed in 3. These rod-shaped glass materials 27I and 25 are melted to create a block 12A.
and 128 are integrally joined.

In this way, as shown in FIG. 8, the rod-shaped glass material 24.2
5 is fused to form a pair of blocks 12A.

A block 26 is formed by joining 12B.

Next, both sides 26a of the block 26 are cut at the cutting surface 27 indicated by the dashed line in FIG. After grinding the front surface 26b of the block 26, which will become the head surface 2C, into an R shape, the block 26 is machined using a slicing machine or
A shallow groove 13 and a deep groove 1 are cut by a saw etc. as shown by the two-dot chain line.
Cut the center of 4 at the position of cutting plane 28 parallel to 8 full 13.14.

Note that by cutting both sides 268 of the block 26, a part of the deep groove 14 is cut, and the glass material 18 filled in the deep groove 14 is exposed on both sides of the block 26. Also, the outer grooves 20 and 22 on both sides of the block 26 are formed on the cut surface 2, respectively.
Since it is carved deeper than 7, it remains even after cutting both side portions 26a.

As shown in FIG. 9, there is a magnetic head core 2 formed by joining a pair of core halves 2a and 2b made of thin plate-like magnetic material as described above, and a glass welded to one side surface 3 of the magnetic head core 2. material 4 and the other side surface 5 of the magnetic head core 2
The magnetic head 1 made of the glass material 7 welded to the vortex 6 formed along the joint portion of the pair of core halves 2a and 2b can be easily manufactured with high precision. In addition, there is no need for the process of adhering reinforcing plates to both sides of the magnetic head core, which is required in conventional laminated magnetic heads, and the magnetic head core 2 can be made thinner than conventional glass welding type magnetic head cores, and mass production is possible. It is possible to respond to changes in

Effects of the Invention Song As mentioned above, according to the magnetic head of the present invention and its manufacturing direction, the magnetic head core can be made thinner to reduce wax current loss at high frequencies, and the manufacturing process of the magnetic head core can be simplified and mass-produced. In particular, as magnetic head cores become thinner, the process of gluing reinforcing materials to the sides of each magnetic head core can be omitted, simplifying the manufacturing process and making it easier to reduce the thickness without much effort. It has the advantage that it is possible to manufacture a magnetic head core with a high density, and also that the track width dimensions of the magnetic head core and the gap portion can be processed stably with high viscosity, and the reliability of high-density recording can be improved.

[Brief explanation of the drawing]

FIG. 1(A) shows one example of the magnetic head tJ(!) according to the present invention.
A perspective view for explaining example i, Fig. 1 <8) is shown in Fig. 1 (
A) is a plan view of the sized magnetic head seen from the head surface;
The figure is a perspective view for explaining the state in which shallow grooves and deep grooves are cut into a magnetic material block, FIG. 3 is a perspective view for explaining the state in which the shallow grooves and deep grooves of the block are filled with glass material, Figures 4 and 5 are perspective views for explaining the state in which grooves are provided in the longitudinal direction of the block, and Figure 6 is ff14.
．． A perspective view for explaining the state in which the blocks shown in Fig. 5 are butted together, Fig. 7 is a perspective view in which a rod-shaped glass material is inserted to join a pair of blocks, and Fig. 8 is a perspective view showing the joined blocks being cut. FIG. 9 is a perspective view of the magnetic head cut from the block shown in FIG. 8, and FIGS. 10 and 11 are perspective views of the conventional magnetic head. be. 1... Magnetic head, 2... Magnetic head core, 4, 7
゜1st...Glass material, 8...r Yap part, 12...
・Magnetic material block, 13...Shallow groove, 14...Deep groove,
15... Protrusion. One person for patents Japan Victor Co., Ltd. Figure 1 Figure 3 Figure 6 Figure 7

Claims (2)

[Claims] (1) A magnetic head core formed by joining a pair of core halves made of thin plate-shaped magnetic material, a glass material welded to one side of the magnetic head core, and a pair of core halves made of a thin plate-like magnetic material, and a glass material welded to one side of the magnetic head core. A magnetic head comprising a glass material welded to a groove formed along a joint between core halves. (2) Deep grooves and shallow grooves having different depths from the bonding surface are formed alternately at predetermined intervals equal to the track width dimension on the bonding surface of the magnetic material block, and the deep grooves and the shallow grooves are filled with a glass material, Next, the pair of magnetic material blocks are butt-jointed with the positions of the deep grooves and the shallow grooves aligned, and then the pair of magnetic material blocks are cut in parallel along each of the deep grooves and each of the shallow grooves. A method for manufacturing a magnetic head, characterized in that a magnetic head is obtained by