JPS60251503A - Manufacturing method of magnetic head - Google Patents

Abstract

PURPOSE:To improve the productivity at the time of manufacturing magnetic heads, by providing glass grooves to be formed in the block of a holder which is adhered to both sides of a metallic magnetic core comprising a magnetic head in parallel with the block surface and a back core to the lower section of the block. CONSTITUTION:Plural grooves 9 for winding are formed in a ferrite wafer 10 in parallel with each other and plural glass grooves 11 for adhering glass are provided at almost right angles to the grooves 9. Then two pieces of the ferrite wafers 10 are glass-adhered as one set after the winding groove 9 and glass groove 11 of one wafer 10 are fitted to those of the other wafer 10. The set of a holder block 14 is divided into pieces at every winding groove 9 and a back core block 15 of the same material is adhered to each of the divided blocks 14. The holder block 14 with the back core block 15 is then sliced along the grooves 11 and holders are formed. The holder is adhered to both sides of a ''Sendut(R)'' core 1 and a magnetic head is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a magnetic head used in a magnetic recording/reproducing device such as a FiVTR.

[Technical background of the invention]

Recently, the recording density of magnetic recording and reproducing devices has been increasing, as exemplified by 8 m VTRK, and in order to meet this trend, it is important to improve metal tapes and magnetic heads. In order to sufficiently inject individual particles into a metal tape with a high coercive force, since the magnetic flux saturates with conventional ferrite heads, it is necessary to use a magnetic metal material with a high saturation magnetic flux density, such as Sendust (85% iron, 9.5% silicon). A metal head of 5.5% aluminum (magnetic alloy) has been proposed. With this Sendust metal head, l MHz ~ 6
In the MHz frequency band, core loss due to eddy current loss becomes large, so as shown in Figure 1, Sendust 1, which has been thinned into a trap so that it has approximately the same width as the track width, is held and integrated with holders 2a + 2b from both sides. It has a similar structure. For these holders 2a and 2b, oxide magnetic material such as ferrite is often used to improve magnetic properties. In addition, the improvement effect on magnetic properties is better as the ferrite holder 2a + 2b is brought as close as possible to the gap of Sendust 1, so that the ferrite can be deposited directly on the tape sliding surface as shown in Fig. 1, and moreover, on the sides of the gap. It has a structure with glass 3 embedded in it.

A conventional manufacturing method for a magnetic head having the above structure is shown in FIGS. 2 to 5. As shown in FIG. 2, a ferrite block 5 in which a winding groove 4, which is one half of the winding hole, has been processed, is made perpendicular to the winding groove 4 and inclined at an angle θ with respect to the block surface. A plurality of glass grooves 6 are formed in parallel at approximately equal intervals. This glass groove 6 is processed using a grindstone having a tip angle of, for example, 90 degrees. As shown in FIG. 4, the two blocks 5a and 5b'i having the glass grooves 6 formed thereon are butted against each other so that the winding grooves 4 and glass grooves 6 formed in each block face each other and are at the same position. A glass rod 7f is placed in one corner 4a of the groove 4, and heated to melt the glass rod 7 into the glass m6, thereby forming the two blocks 5a,
Glue 5b. Two blocks 5a integrated with adhesive
, 5b is the thin plate 8 with the hatched area shown in Fig. 4 as the cutting allowance.
is cut off. Both sides of the cut thin plate 80 are wrapped to a predetermined thickness as indicated by the dotted line in FIG.
Ferrite holders 2a and 2b shown in FIG. 1 are completed. The thin plate-shaped sendust 1 is also provided with a winding groove having almost the same shape as the winding groove 4 formed in the ferrite holders 2b, and the positions of these winding grooves are aligned. A magnetic spatula P was manufactured by bonding two ferrite holders 2a and 2b to both sides of a Sendust 10 using an organic adhesive or the like. In this case, the reason why the boundary line between glass and ferrite on the tape sliding surface forms a large angle with the gap inclination angle is to prevent crosstalk in the low frequency band.

[Problems with background technology]

In the conventional manufacturing method of the magnetic spatula P as described above, the glass grooves 6 formed in the block 5 are formed at an angle θ with respect to the surface of the block 50. It is difficult to process the glass grooves on the blocks 5, and it is impossible to bond the glass on a block-by-block basis, so each winding groove 4 has to be bonded, which poses a problem in productivity during mass production. In order to solve this problem, if the glass grooves 6 are not sloped and the glass grooves are formed on the entire block parallel to the surface of the block 50, productivity will be improved, but the lower pack core of the winding 11J4 The disadvantage was that the magnetic path was missing in some parts.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method of manufacturing a magnetic head that can improve productivity during mass production.

[Summary of the invention]

The present invention is a method for manufacturing a magnetic head in which a ferrite holder is bonded to both sides of a sendust core, in which a plurality of winding grooves are formed in parallel to each other on a ferrite wafer, and a plurality of winding grooves are formed approximately at right angles to the winding grooves. glass grooves for glass bonding are formed, these winding grooves and glass grooves are aligned, and the two ferrite wafers are glass bonded as a set, and this glass bonded pair of holder blocks is bonded to the winding grooves. Divide each line groove, and glue two core blocks made of the same material as these holder blocks to these divided holder blocks. The desired purpose is achieved by cutting the sendust core into holders and gluing these holders to both sides of the sendust core.

[Embodiments of the invention]

An embodiment of the method for manufacturing a magnetic spatula r according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 6 to 11. Figure 6 (
As shown in a) and (b) as a side view and a front view, respectively, a plurality of glass grooves 11 are formed in parallel at substantially right angles to the winding grooves 9 on a ferrite wafer 10 on which three winding grooves 9 have been processed. . The cross-sectional shape of the glass groove 11 is processed using a grindstone whose tip angle is approximately 90°, so that the bottom surface of the groove is approximately 90°, as shown in FIG. This glass groove 11
traverses all three windings n9 at approximately right angles. As shown in FIG. 7, two ferrite wafers 10a and 10b each having a glass groove 11 formed thereon are arranged so that the winding groove 9 and the glass groove 11 are aligned facing each other. Groove 12 formed in the part
Insert the glass rod 131 into the glass groove 11 by heating and melting it.
Melt it inside and glue it. As shown in FIG. 8, the diagonal line between the winding grooves 90 is cut out to form three holder blocks 14a.

14b and 14c are created. These holder blocks, for example 14a, are bonded to ferrite blocks 15 having the same plane as shown in FIG. This bonding method involves applying an organic adhesive or low melting point glass to the bonding surface, and then heat bonding to integrate the components. This block is cut out by the same means as in the conventional example shown in FIG. 4, leaving only the portion between the center of the glass groove 11 and the side surfaces, and both sides are wrapped to a predetermined thickness to complete the holder 16. The process of arranging the two completed ferrite holders 16a and 16b with the winding grooves aligned on both sides of the sendust 10 as shown in FIG. 11, and bonding them with an organic adhesive or the like to form a magnetic spatula r is a conventional process. Similar to the example.

In the manufacturing method of the magnetic head according to the present embodiment as described above, since the glass groove is not inclined with respect to the block surface, the three ferrite blocks can be bonded to the glass as one body, and the process is simple. Since it has a solid core, there will be no loss of magnetic path.

In this embodiment, a case has been described in which three winding grooves are formed in the holder, but it goes without saying that the number of winding grooves is not limited to three. Further, the winding groove may be formed only in either ferrite wafer 10a or 10b.

〔Effect of the invention〕

As described above, according to the present invention, the glass grooves formed in the block of the holder bonded to both sides of the metal magnetic core constituting the magnetic head are made parallel to the block surface, and the pack core is provided at the bottom of the block. The glass bonding process of the ferrite holder can be simplified without causing any magnetic path defects, and the productivity during mass production of the magnetic spatula r can be improved, which is highly effective.

[Brief explanation of drawings]

Figure 1 is a partial perspective view showing the structure of a conventional magnetic head, Figure 2 is a partial enlarged perspective view showing the structure of the winding groove and glass groove of a conventional magnetic spatula P block, and Figures 3 to 5 are FIGS. 6 to 10 are perspective views showing steps of a conventional method for manufacturing a magnetic head, FIGS. 6 to 10 are perspective views showing steps of an embodiment of a method for manufacturing a magnetic spatula r according to the present invention, and FIG. FIG. 2 is a partial perspective view showing the structure of a magnetic spatula r manufactured by a method according to an embodiment. 1... Sendust 2... Ferrite holder 3.
...Glass 4,9...5ss5,10...Wafer block 6,11...Glass groove 7,13...
Glass rod 8... Ferrite thin plate 12... Groove 14
...Holder block 15... Ferrite block agent Patent attorney Noriyuki Chika Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Ward Isso 0 15 Fig. 8 Fig. 9 1 Figure 10 1

Claims (1)

[Claims] 1. A method for manufacturing a magnetic head in which a holder made of oxide magnetic material is adhered to both sides of a metal magnetic core,
a step of forming a plurality of winding grooves parallel to each other in the wafer of the oxide magnetic material; a step of forming a plurality of glass grooves for glass bonding almost perpendicularly to the winding grooves; and a step of forming these winding grooves in parallel. a step of aligning the grooves and glass grooves and bonding the two wafers as a set with glass; and a step of dividing the set of glass-bonded holder blocks into a plurality of holder blocks for each of the winding grooves. , a process of gluing blocks that will become /9 cores made of the same material as these holder blocks to these divided holder blocks, and cutting the holder block to which the blocks that will become the back cores are glued in the direction of the glass groove. A method of manufacturing a magnetic head, comprising the steps of forming holders and adhering these holders to both sides of the metal magnetic core. 2. The method of manufacturing a magnetic head according to claim 1, wherein the metal magnetic core is Sendust. 3. The method of manufacturing a magnetic head according to claim 1, wherein the oxide magnetic material is ferrite.