JPS6095715A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a stable magnetic air gap by using a core half applying sandwich lamination to a magnetic core with an auxiliary base while using a low melting point glass as an adhesives and applying a low temperature cured inorganic adhesives having approximate thermal expansion coefficient to that of the core half from the side face of the half so as to connect the auxiliary bases. CONSTITUTION:The glass base 9 sputtering a metallic magnetic core member having a large saturation magnetic flux such as amorphous or ''Sendust'' on the surface and the 2nd glass base 10 melting a low melting point glass 11 on the surface are used. The magnetic head is formed by using a couple of core halves 12 incorporated by melting again the low melting point glass 14 while the metallic magnetic core of the bases 9, 10 and the low melting point glass 11 are bonded together. The low temperature cured inorganic adhesives 14 is applied to the core halves 12 and fixed, at least a part of the bonding of both the bases 9, 10 is formed, and the halves 12 are molten and bonded together by inserting at least the low melting point glass 11 to at least the magnetic air gap forming face or the winding window of the core halves 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head that is suitable for high-density magnetic recording and has superior characteristics to metal tapes.

(Conventional structure and its problems) Recently, with the increase in the density of magnetic recording, a metal material with a high saturation magnetic flux density is required as a magnetic material.
Particular emphasis is placed on amorphous alloys.

FIG. 1 is an example of a conventional video head using a thin plate or film made of metal magnetic material.

Like a video head, the head width W is 10
When the track width is extremely narrow, it is common to use a thin film that is rolled or sputtered to a thickness equal to the track width. Magnetic heads formed only from thin plates or thin films have the disadvantage of being very weak in terms of the strength of the core itself or the abrasion resistance with 9:1 tape. Alternatively, a sandwich layered structure using ferrite plates or the like as auxiliary substrates 2 and 3 increases the width of the magnetic head and improves its strength and wear resistance.ff1i
If the metal core is glued onto the first auxiliary substrate 2 as described in Section 1, no adhesive is required. However, on the other hand, the auxiliary substrate 3 needs to be bonded using the adhesive layer 4. That is, the adhesive layer 4 is present on at least one of the auxiliary substrates on which the sandwich is stacked. Conventionally, when an amorphous alloy is used as the core material for most of the adhesive layer 4, it must be processed within a temperature range where the magnetic properties of the core do not deteriorate, that is, below the amorphous crystallization temperature. Since the Tx of an amorphous alloy is usually 400° C. to 500° C., epoxy resins have been used because they can be bonded relatively easily at temperatures below that temperature. However, the epoxy resin adhesive layer does not depend on strength or temperature.
The adhesive force becomes weaker due to temperature changes, especially when the magnetic gap 5
Due to the polishing process of the surface on which the Zandwich layer is formed, the strength against the tape sliding on the front surface of the magnetic head is lost, and the magnetic core 1 and the auxiliary substrate 3 often peel off from the adhesive layer 1. There was a drawback that the structure could not be maintained. For this reason, a structure in which the bonding force between the auxiliary substrate 3 and the magnetic core 1 is increased and the strength against polishing or impact is increased by configuring the adhesive layer 4'f with a glass layer instead of using the Evogin resin has also been put into practical use. It's starting. In order to manufacture a magnetic head with a highly accurate and stable magnetic gap 5 by using the glass-laminated core halves, K is used for forming the magnetic gap 5 forming surface and its bond, as seen in the ferrite spatula. must be done with glass. However, when an amorphous alloy core is used, the glass is limited to a low melting point because, as mentioned above, the glass must be processable at a temperature below the crystallization temperature of the amorphous alloy.

For this reason, in conventional magnetism, a half-core core is sandwich-laminated with low-melting glass, and a low-melting glass 6 of the same type or almost similar to that used in the stacking is attached to the magnetic gap forming surface of the half-core. Alternatively, the low melting point glass 6 is interposed in the winding window near the magnetic gap forming surface, and the magnetic held body 7 is manufactured by welding and integrally bonding the glass 6.

Conventional magnetic heads, such as those described by Jin, are constructed by using at least the same low-melting point glass for the laminated portion and the magnetic gap forming portion, but in order to satisfy the quality or basic characteristics of the magnetic head, post-processing is required. The glass in the magnetic gap configuration must be sufficiently melted, and the glass welding temperature has to be raised or the processing time has to be longer than in the case of lamination. For this reason, the 27 layers of force laminated in the previous process also
As a result of remelting, the magnetic core l of the sandwich laminated portion and the auxiliary substrate 3 are separated, resulting in a decrease in track width accuracy and the inability to secure the width of the most important magnetic gap 5. This led to a decline in the performance and quality of the magnetic head, and a decline in the yield of the manufacturing process.

(Objective of the Invention) The object of the present invention is to eliminate the drawbacks of the conventional example, fill and apply a low-temperature curing inorganic adhesive from the periphery of the laminated core body, and increase the recombination lamination strength of the laminated core body mechanically and heat resistant. It is also to improve.

(Structure of the Invention) The magnetic head of the present invention uses a core half-hole in which a magnetic core is laminated in a sand char on an auxiliary substrate using low melting point glass as an adhesive. A low-temperature curing inorganic adhesive is applied to firmly connect the auxiliary substrates, and a pair of half-core cores thus formed are welded together using low-melting glass, with their magnetic gap forming surfaces facing each other. It is something that becomes.

(Embodiment of the Invention) An embodiment of the present invention will be described based on FIGS. 2 to 5.

FIG. 2(a) shows the half core of the magnetic head structure. An amorphous alloy is used as the magnetic helad core material. Amorphous alloy has a saturation magnetic flux density of approximately 1100 oersted and a coefficient of thermal expansion of approximately 120X10-
7/°C, and its crystallization temperature is about 500°C.

Using such an amorphous alloy, the surface of the auxiliary substrate 9, which is made of a glass material that has been processed into the required dimensions and shape in advance, is coated by sputtering.

An amorphous alloy layer 8 is deposited with a thickness equal to the width of the amorphous alloy.

This auxiliary substrate 9 is made of glass having approximately the same coefficient of thermal expansion as that of the amorphous alloy, so that it is possible to prevent warping caused by the difference in coefficient of thermal expansion during sputtering of the amorphous alloy. Auxiliary board 9
The initial flatness of can be maintained. In addition, as the material for the auxiliary substrate 9, materials other than glass may be used as long as they are non-conductive and have a high insulation resistance, such as ceramic.

Next, the auxiliary substrate 10 is prepared. This auxiliary substrate 10 is almost the same as the auxiliary substrate 9, and a low melting point glass layer 11 with a thickness of 1 to 3 microns is formed on the surface of the auxiliary substrate 10 by a suitable method such as sintering, vapor deposition, powdered or thin glass. It is interposed and welded to form a uniform layer.

In this way, by using the auxiliary substrates 9, 10, the surface-adhered amorphous alloy layer 8, and the glass layer 11, which have substantially the same coefficient of thermal expansion, there is no fear of warpage or cracks occurring during welding.

Therefore, the amorphous alloy layer 8 and the glass layer 11 on the auxiliary substrates 9 and 10 are bonded together, and the glass layer 11 is remelted by heating to the melting temperature of the glass layer 11.
The auxiliary substrates 9 and 10 on both sides are combined to form a laminated core half 12.

In order to perform this heat treatment at a temperature that does not deteriorate the magnetic properties of the amorphous alloy, a low melting point glass d with a softening temperature of approximately 360°C is used, and heat treatment for 30 minutes at =I50'C is performed between the auxiliary substrates 9 and 10. A core half of the Zandwich lamination, in which the amorphous alloy layer 8 and the glass layer 11 are stretched, is completed.

Next, a common groove 13 is formed in the auxiliary substrate 9° 10 from the side surface of the core half 12. Next, a low-temperature curing inorganic binder 14 is applied and filled into the common groove 13.

In the present invention, Sumiceram (
The registered trademark S-18A)-4 manufactured by Sumitomo Chemical Industries, Ltd. was used. The main component of S-1'8A is 7 liters, and it has a thermal expansion coefficient of 110 x 1 o-'/°C after being assimilated at a curing temperature of 100°C or higher and a curing time of about 60 minutes.
, it becomes cement-like with a heat-resistant temperature of about 12oo℃, and the common groove 1
3. It will stick firmly in the middle.

The above-mentioned Sumiceram may have alumina as its main component or a mixture of warp and alumina, and its bonding strength, coefficient of thermal expansion, hardness, etc. can be freely configured. Aron Ceramic manufactured by Toagosei Co., Ltd. can also be used as a low-temperature curing inorganic binder similar to Ushida.

Furthermore, as the structure of the core half 2, as shown in FIG. There is also a method of enclosing and fixing the core half-hole from the outside with a glass member 15, and as shown in FIG. The glass rod 16 still has a glass plate inserted therein and a low-temperature curing inorganic binder coated and fixed thereon.

By filling the core half 12 with the low-temperature curing inorganic binder, the core laminated layers are doubly bonded, and defects due to peeling of the laminated core occur during the polishing process of the magnetic gap forming surface. It disappears.

FIG. 3 shows a magnetic head 19 in which a magnetic gap 18f is formed using a pair of core halves 12 shown in FIG. 2, with their magnetic gap forming surfaces facing each other. On the magnetic gap forming surface, a glass layer with approximately the same melting point as the glass layer 11 of the core half laminated portion is entirely interposed, and a glass layer 17 is placed on the winding edge formed by the left and right core halves 12. is heated to a melting temperature, the left and right core halves 12 are adhesively bonded, and a magnetic head 9 having a magnetic gap 18 is completed.

Note that the heat treatment temperature of the glass in the wire-wound window was 480° C. and the heating time was 30 minutes. Thereby, the left and right core halves can be firmly and integrally connected.

At the same time, the glass portion 11 of the core halves 12 is heated to a higher temperature than when the core halves 12 are laminated, and therefore becomes remelted. However, since the low temperature curing inorganic agent fixed in or near the common groove 13 has a heat resistance of 1000°C,
There is no deformation at all when heated, the connection between the laminated layers does not loosen, and an accurate magnetic gap 18 or high precision track width can be formed.

Next, in the magnetic head having the auxiliary structure according to the present invention as shown in FIG. 4, sufficient lamination strength is ensured even in the step of cutting and separating the single magnetic heads III+h2 and h3 from the head block body 2o.

FIG. 5 shows a magnetic head structure showing still another embodiment.

The laminated core halves shown in Fig. 2 are made into one block, and a low melting point force 27 layer 21 is present on the first surface, and a large number of composite core halves are repeatedly layered in the thickness direction. +
11 +h2 +h3 *h4 and h5 are welded together to form a rod shape, a common groove is provided in a part of the groove, a glass rod 16 is inserted, and a low-temperature curing inorganic binder 14 is filled from the periphery of the solid core. This is a mass-produced magnetic head structure in which the magnetic gap 18 is constructed using the following.

(Effects of the Invention) According to the present invention, the strength between the glass laminated cores is increased, and the glass laminated cores are treated at a high temperature during lamination, so that the glass treatment temperature during magnetic gap formation can be made high. Therefore, strong core coupling and stable magnetic air gap can be obtained.

In addition, there are various effects that can be achieved by using a tube that can accommodate a large number of magnetic heads at the same time.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional magnetic head, FIG. 2(a) is a perspective view of a half-open core for a magnetic head according to an embodiment of the present invention,
2(b) to 0→ are the same sectional views, FIG. 3 is a perspective view of a magnetic head according to an embodiment of the present invention, and FIGS. 4 and 5.
The figure is a perspective view of the multiplex magnetic head. ■... Metal core, 2, 3... Auxiliary substrate, 4... Adhesive layer, 5... Magnetic gap, 6... Low melting point glass, 7...
...Magnetic head body, 8...Amorphous alloy/LL
911.0... Auxiliary substrate, 11... Low melting point glass layer, 12... Core semi-dead, 13... Common groove, 14... Low temperature curing inorganic binder, 15... Glass member, 16...・・・
Glass rod, 17...Low melting point glass, 18...Magnetic gap, 19...Magnetic head, 21...Low melting point glass layer,
)+1 1h2, b3 +)+4 1h5...Composite core half-day off. Patent Applicant Matsushita Electric Industrial Co., Ltd. Agent Hisashi Hoshino Figure 1 Figure 2 - Figure 3 Inhibition Figure 4 u Figure 5 Old

Claims (1)

[Claims] A first glass substrate on which a metal magnetic core material with a high saturation magnetic flux density such as amorphous or sendust is deposited, and a second glass substrate on which a low melting point glass is bonded. using the first method above. In a magnetic head using a pair of core halves formed by remelting the low melting point glass while bonding the metal magnetic core of the second substrate and the low melting point glass to each other, the core halves have a low temperature. A hardened inorganic adhesive is applied and fixed to form at least one connecting portion between the first and second substrates, and at least a low A magnetic head characterized in that each half is welded and combined with a melting point glass.