JPS61148616A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To make nice setting of glass and improve strength of a core remarkably by sticking a thin non-magnetic film arround a track including inner face of a track groove beforehand as a foundation layer when setting glass in the track groove as a protective material for bonding. CONSTITUTION:Ag brazing filler metal accumulating grooves 31, 32, a groove 33 for passing window of winding, winding locking grooves 34, 35 are cut before hand by a die etc., and after sticking a non-magnetic SiO2 film 36 having thick ness equal to the gap of a magnetic gap, i.e. several thousand Angstrom , on the joint face near the top by sputtering, joined by Ag brazing 37. Under this state, a magnetic gap 39 appears at the center of the top face 38. Then, track grooves 20, 20- are cut along lateral direction on the top face, worked to comblike form, and then an Al2O3 film 24 is formed. Then, a comb is obtained by conven tional way.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to processing near a gap after core bonding in manufacturing a magnetic head, and relates to glass embedding technology for electronic elements and the like.

Subdivision 1 - Conventionally, as an element for performing magnetic recording and reproduction, a magnetic head that applies the principle of partial magnetization by magnetic permeation or IF induction has been required. This magnetic head has generally used a ferrite core, but recently, as the medium magnetic tape uses metal magnetic materials, etc.
High saturation magnetic flux density is required, and alloy cores such as Sendust are being adopted. That is, this Sendust core has a saturation magnetic flux density of 9500, as shown in the magazine "Electronic Materials J 1! June 381 issue P2O6".
Gauss, coercive force 20m0e N effective permeability 3000
It has excellent properties such as 0at300Hz1 and Vickers hardness of 500.

This Sendust core differs from conventional ferrite cores in the way the cores are joined. In other words, as shown in Fig. 6, it is virtually impossible to glass-weld the core halves 1 and 2 with the sendust core, so adhesive 3 such as Ag solder is accumulated at the joint ends of the two to join them. I'm letting you do it. And in this case, the tops 5, 6 forming the magnetic gap 4
In this case, diamagnetic material such as Ag solder cannot be used, so recesses are formed on both side walls and glass 7.8 is embedded to serve as gap protection.

roi ・° ＋ 　　　. 8 divination However, the Sendust core described above has a composition of Sl.

It is an alloy consisting of AX and Fe, and the compatibility between the glass 7.8 and the tops 5 and 6 is not good, so
It was extremely difficult to embed the glass. In other words, as shown in Fig. 7, an assembled body in which a core block with a thickness of several dozen cores is joined with Ag solder is shaped like Track grooves 8, 9.
. . . . does not fit in with the inner surface of the track grooves 3, 9. The width dimension T of...
Dot-dashed line 11.11 , slice interval of...
In other words, depending on the thickness of the core plate, it is about 100-odd μm, so
The viscosity of the glass 10 had an adverse effect, and it sometimes hardened as shown by the solid line.

Moreover, as mentioned above, due to the unevenness of the glass lO,
If it solidifies in an unfavorable manner, it may cause track misalignment or opening of the magnetic cap when the core blocks are butted against each other and slid to align the tracks, and the glass 10 that is trying to harden from the molten state may cause the surrounding air There was a problem in that it invited crowding and generated bubbles.

This invention was proposed as a result of consideration of the above circumstances.

. ° In order to solve the above-mentioned problems, this invention provides a core that has undergone processing such as predetermined adhesive reservoir grooves, winding through-hole grooves, winding locking grooves, and magnetic gap spacer film formation. After the blocks are bonded and fixed with an adhesive, a track groove is formed to set the track width, and when embedding glass as an adhesive protection material in the track groove, the film thickness is determined in advance around the track including the inner surface of the track groove. A non-magnetic thin film with a diameter of 2 μm or more,
It is characterized by being attached as a base layer.

In other words, the present invention improves the inner surface treatment of the track groove, thereby making it possible to better embed the glass and significantly improve the strength of the core.

1 Dish In this invention, since the lamination base treatment on the inner surface of the track groove is extremely suitable, the glass embedding which serves as an adhesive protection material becomes extremely good. Moreover, in this invention, the track periphery is made of a non-magnetic material that has good conformability when buried in glass, that is, Af□0.
Since it is surrounded by a hard and durable thin film such as 3 or S10□, the mechanical strength of the track forming part of the core block increases, and bending, which can cause track misalignment, magnetic gaps, and air bubbles when joining the core blocks, increases. In addition, the non-magnetic thin film serves as a base layer for glass with a low softening point, so even embedded glass with higher viscosity than conventional glass can be used.
Track grooves can be reliably filled.

! Takumi FIG. 1 shows a magnetic head according to an embodiment of the present invention.
FIG. 3 is a side sectional view of a main part in a partially sectional view in a joined state of the core block. First, 20.20, Old... is a track groove formed by cutting a large number of track width dimensions in parallel at intervals on the top of the core block assembly 220, and the depth is at least 4 or more in magnetic gap depth dimension, and the width dimension is T is indicated by dot-dash lines 21, 21 . Since the slices are to be sliced along ..., the thickness is about 100-130 μm. Therefore, the track groove 20.20 of the core block assembly 22
,...The shape at the time of formation is that the side surface is tooth-shaped, with a convex part 23°23, which is a tooth part.
- A magnetic gap is provided as described below.

Now, the inner surfaces of the track grooves 20.2G, . . . and the protrusions 23, 23.23, which surround the tracks.・・・・・・
On the surface of
Attach as follows. That is, by high-frequency sputtering or the like, the bottom surfaces 25, 25 of the track grooves 20.20, . . . , and the convex portions 23.23, .
Approximately 5 μm1 on the top surface 2B, 2B, ...... and the convex portion 23.23, the side wall surface 27.27 of ...
, . . . to a thickness of 2 to 3 μm. 28, track grooves 20.20, . . . and convex portions 23.23. The top surface of 2G, 2G.

The molded track protection member is made of Pb glass and has a softening point TG of about 700°C.

The core block assembly 22 described above is obtained through the following steps. First, as shown in FIG. 2, the composition is 6.2% AI, 9.6% S+, and 84% Fe.
The core block is made of Sendust alloy with 2% (wt%) and a Pinkers hardness Hv of 580, and is equivalent to several dozen cores.
30, cut the Ag wax reservoir grooves 31, 32, the winding pass-through groove 339, and the winding locking grooves 34, 35 with a dicer, etc., on the joint surface (either one is possible) near the top. A non-magnetic material S r 02 M 3 G with a film thickness equal to the gap size of the magnetic gap, that is, several thousand amps, is deposited on the substrate by spazotaring, and then bonded with an Ag solder 37 .

Therefore, in this state, a magnetic gap 39 is formed at the center on the top surface 38.
It's showing. Next, as shown in FIG.
A track groove 20 having the various dimensions described above is formed along the transverse direction.
．． 20 Cut and process into a comb shape. After that, as shown in FIG.
form. Thereafter, as in the conventional case, the core block assembly 22 is placed in a heat welding jig (not shown), and as shown in FIG. Pb glass is placed and welded by heating at about 700° C. to obtain a core block assembly 22 as shown in FIG.

The subsequent steps for finishing the individual cores are the same as in the prior art, and therefore their explanation will be omitted.

Here, the reason why the Al2O3 film 24 is set to have a thickness of 2 μm or more in the trunk grooves 20, 20, 20, 20, 20, .・・・・・・
As mentioned above, if the thickness is 2 μm, the film surface will be sufficiently compatible when molding the Pb glass 28, and will not peel off from the convex portions 23, 23, . . . .

In the above embodiment, Pb glass is used as the adhesive protection material and Af□03 thin film is used as the base layer, but this invention also uses other materials such as silicate glass, phosphate glass,
An I02 thin film or the like may be used.

According to this invention, the glass embedding that protects the magnetic gap becomes better, and the track grooves are reliably filled, thereby preventing track misalignment, opening of the magnetic gap, and generation of bubbles in the glass when joining the core blocks. Since this can be prevented, the mass productivity and reliability of the core will be improved. Furthermore, since the magnetic gap protection strength of the core is sufficiently high, the core processing operation after joining the core blocks is also facilitated.

[Brief explanation of drawings]

FIG. 1 is a partially cross-sectional side view of a main part of a magnetic head core in a state where core blocks are joined, and FIGS. 2 to 5 are perspective views of a magnetic head core in each manufacturing process, according to an embodiment of the present invention. FIG. 6 is a perspective view of a general Sendust magnetic herad core, and FIG. 7 is a side view of the main part in a partially sectional view in a state where the core block is joined. 20...Track groove, 22...Core block assembly, 23...
・Convex portion, 24... Non-magnetic thin film, 28... Glass, 29, 30... Core block, 31, 32...
...Adhesive reservoir groove, 33... Winding pass-through groove, 34, 35... Winding locking groove, 3B... Magnetic gap spacer film. W! Figure 47

Claims (1)

[Claims] After bonding and fixing the core block with a predetermined adhesive material groove, winding window groove, winding locking groove, magnetic gap spacer film formation, etc. using adhesive, we set the track width. When forming a track groove and embedding glass as an adhesive protection material in the track groove, a magnetic head that attaches a non-magnetic thin film with a thickness of 2 μm or more as an underlayer in advance around the track, including the inner surface of the track groove. manufacturing method.