JPS60145517A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To prevent partial wear of a magnetic head by putting an adhesive glass layer, which is formed on a substrate and a magnetic material formed on a substrate consisting of the same materials as said substrate and adhering them in a powder by pressurizing and heating to make a base material. CONSTITUTION:An amorphous magnetic material 2 is formed on a crystallized glass substrate 1 by sputtering, and a lead glass layer 4 for adhesion is formed on a crystallized glass substrate 3 consisting of the same materials as the substrate 1 by sputtering, and the substrate 3 is put on the substrate 1, and they are arranged in alumina powder 5 in a cylinder 8, and they are heated and adhered by an electric furnace in the state where pressures are applied from above and below in directions of arrows 9, thus producing the substrate base material; and this base material is cut to complete a video head chip. The adhesive glass layer 4 obtained in this manner is formed uniformly with less defects such as air bubbles, and partial wear for tape sliding is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method of manufacturing a θ-shape head used in a magnetic recording 11 recording device.

Conventional structure and its problems In the manufacturing method of a magnetic head, a magnetic layer is formed on a C substrate using conventional methods such as vapor deposition or sputtering, and then it is formed into an hXf layer. There is a chika.

However, the problem at this time is the protective layer of the magnetic layer. In addition to the Zunawara Uki-1 type head 4J, there are other types of heads that come into contact with the medium and move. When the magnetic material 1f1 does not have a protective layer, the medium tt
Is there a magnetic material at 1 o'clock? , li Jl di 9, may be added, and even if a protective layer is provided, the base (
υ, magnetic material;

Uneven wear occurs between the protective layers, resulting in loss of spacing between the edges of the media, resulting in inconvenience.

Therefore, methods are being considered in which the protective layer is made of the same quality as the substrate, and the adhesive layer is made as thin as possible for bonding. However, in order to make the adhesive layer thinner, in addition to reducing the thickness of the adhesive layer, it is also necessary to improve the mechanical accuracy (flatness 2 surface roughness) before bonding.
This also requires a structure (jig) that allows for close contact without gaps, making it difficult to bond the entire plane of the substrate to a thickness of several microns or less without defects such as air bubbles.

Therefore, as shown in FIG. 6, a magnetic head using a thin film is constructed by providing a gap spacer 22 on the second side of a magnetic substrate 21, and including a pickup coil 24 with a magnetic B'A 23 thereon to form a ring-shaped magnetic head. However, the mainstream is a structure in which glass JW25 is filled thereon as a protective layer. In most cases, the magnetic group 1 and 21 are made of ferrite, and the protection 1 m is made of lead glass, and there are no defects such as bubbles. However, when the tape slides, uneven wear occurs between the ferrite and glass parts, causing problems.

L1 aspect of the invention An object of the invention is to provide a method of manufacturing a magnetic head that can prevent uneven wear by +I=-3.

Structure of the Invention The present invention comprises a magnetic material forming step in which a magnetic material is formed by deposition, sputtering, etc. on a wear-resistant substrate, and an adhesive glass forming step in which an adhesive glass layer is formed on a substrate of the same type as the substrate. , an adhesion step in which the magnetic material and the bonding glass layer are placed in a superimposed powder body, and the powder is contacted with the powder by heating while pressurizing it to form a base material; and a magnetic head is made from the base material. It is characterized by including a processing process. Since the magnetic material and adhesive glass layer are bonded in powder without applying pressure to the powder, uniform pressure is applied to the adhesive glass.
Thereby, the adhesive glass layer can be formed uniformly, the adhesive glass layer can be formed thinly with few defects such as bubbles, and uneven PX and wear can be prevented.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 7. Of course, this is for video heads used in video tape recorders. As shown in Fig. 1, amorphous magnetic material (CoNb 4r; heavy IJ ratio is 8 in the order of arrangement)
2:12:6) 2 was formed to a thickness of 30 μm by sputtering. On the other hand, an adhesive lead glass layer (PbO-B203Si02; weight ratio 80:10:10 in order of arrangement) 4 was formed on the same type of crystallized glass substrate 3 to a thickness of 5000 mm by sputtering. These two types of substrates 1 and 3 are superimposed as shown in FIG. 2, and using an alumina cylinder 8, an upper punch 7 and a lower punch 6, alumina powder (No. 60 Nosonyu) 5 is glued and arranged, From above and below (arrow 9) 50k
Pressure was applied with gr/cJ. In this pressurized state, heat it in an electric furnace at 450'C for 30 minutes,
The cooling process has been completed. At this time, the test was carried out in a nitrogen atmosphere to prevent the amorphous magnetic material 2 from being oxidized. The softening point of the lead glass layer 4 for adhesion is 360'C, and the working point is 550'C at 1 o void, but the softening point is 450'C by 9 pressures.
I was able to glue it with enough heat at 'C'. Moreover, since the pressure is applied evenly, there are very few air bubbles, and the air bubbles are small. As shown in Fig. 3, the substrate base material A prepared in this way is cut at an azimuth angle of 1°, which is necessary for a normal home VTR. I wore it.

Thereafter, a winding groove 11 was formed as shown in FIG. 4, and a cap was formed by rejoining via a gap spacer 12. Furthermore, it was cut into individual chips with a chip width of 3 to complete the video head chip shown in FIG.

By pressurizing and heating bonding the magnetic material forming substrate 1 and the adhesive glass layer forming substrate 3 in powder in this way, the copper is strong enough to withstand the impact of mechanical application in the subsequent process, and the substrate 3 and the magnetic layer are bonded together. The adhesive glass layer 4 of the body 2 was 5000. At this time, the thickness of the substrate base material was 25 x 25 mm, and the thickness after adhesion was 2.51111 mm. , No. 2, 25x25 dragonfly, cannot be pressed evenly over the entire adhesive surface with the standard 6-type jig that presses with a spring, so the contact was made in the process of cutting out the strips shown in Figure 3. There were many defects such as adhesive peeling due to defects 11 and 7, and the yield was poor.

In addition, the thickness of the adhesive glass layer 4 is 100 mm, 5000 mm.
Man.

Although the test δ·1 was 1, 5, and 10 μm, sufficient adhesive strength could be obtained at any thickness. However, the amount of uneven wear of the adhesive glass layer 4 during tape sliding is less than 100 Å when the adhesive glass layer 4 is 1 μm thick, 200 Å when the adhesive glass layer 4 is 5 μm thick, and 50 Å when the adhesive glass layer 4 is 1 μm thick during normal video tape running.
Uneven wear of 0 Å or more was exhibited, and in this case peripheral output deterioration occurred. From this, it was found that the glass layer 4 needs to have a thickness of 5 μIn or less.

In the embodiment, a pair of the magnetic material forming substrate 1 and the bonding glass forming substrate 3 are used in the explanation, but this is not limited to one pair, and it is also possible to bond several layers. Moreover, if the pressure in the powder was less than 5 kg/cIa, sufficient adhesion could not be achieved and bubbles were generated, and if it was more than 80 kgr/-, the crystallized glass substrate 1.3 would be permanently deformed, which was disadvantageous.

Effects of the Invention As described above, according to the present invention, it is possible to prevent uneven wear, and even on a relatively large adhesive surface, the adhesive glass layer can be formed uniformly and with few defects such as bubbles. It has the effect of being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the substrate base material used in an embodiment of the present invention before bonding, Fig. 2 is a partially cutaway perspective view of an apparatus for pressurizing bonding through bodies, and Fig. 3 is a perspective view of the substrate base material before bonding. An explanatory diagram of the process of cutting the material at an azimuth angle, FIG. 4 is an explanatory diagram of the cap forming process,
FIG. 5 is a perspective view of a completed video recording head, and FIG. 6 is an explanatory diagram of a conventional magnetic head using a θ-curable thin film. ■, 3...Substrate, 2...Magnetic material, 4...Adhesive glass layer, 5...Powder, A...Mother

Claims (1)

[Scope of Claims] (1) A magnetic material forming step in which a magnetic material is formed on a substrate by vapor deposition or sputtering, an adhesive glass forming step in which 1 m of adhesive glass is formed on a substrate of the same type as the substrate, and the magnetic material and the adhesive glass layer are superimposed and placed in the powder,
Adhesion of bonding the powder by heating it while pressurizing it to form a base material] Step 2 and step 7 above. A method for manufacturing a magnetic head, which includes the following two steps: manufacturing a magnetic head from two-phase U. (211iij the substrate is crystallized glass, the magnetic material is an amorphous alloy, 1); 1 the adhesive glass layer is ≦H
A method for manufacturing a magnetic heel according to claim (1), which is H, I thread crow. (3) Claim (2), wherein the adhesive glass layer has a thickness of 5 μITI or less. 1. The method for manufacturing the magnetic head according to i'1. (4) The pressure during the pressurization is 5 to 80 kg/cIi.
A method of manufacturing a magnetic head according to claim (1), (2), or (3).