JPS6196502A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To secure the bonding, to prevent the generation of stripping, and to improve the reliability by providing a bonding material at the outside of a magnetic head core, and bonding a couple of reinforcing bodies with the bonding material. CONSTITUTION:A magnetic head 4 is composed of reinforcing bodies 5 and 6, a magnetic head core 7, a bonding material 8, etc., and a groove 10 for winding a coil and a winding hole 9 are formed. Magnetic head cores 7a and 7b consisting of a thin film of a metallic magnetic material such as 'Sendust(R)' are formed on the reinforcing half bodies 5a and 5b, and a bonding material 8 of low m.p. glass is coated at the outside of said cores by sputtering, etc. The reinforcing bodies 5 and 6 are bonded into by the bonding material 8 with the head core 7 in between, and said parts are united. Consequently, the bonding is secured, the generation of stripping is eliminated, and the reliability is improved.

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 that are highly reliable and suitable for mass production.

2. Description of the Related Art In general, a magnetic head has li! It is known that the narrower the thickness of the head core, the higher the density of magnetic recording. Therefore, in order to increase the density of magnetic recording, conventionally the magnetic head core was formed from a metallic magnetic thin film with high saturation magnetic flux density, and this was sandwiched between reinforcing plates made of non-magnetic material to provide mechanical strength. There is a magnetic head structure.

This type of magnetic head, as shown in FIG.
After film-molding the magnetic head cores 3a and 3b on one of the reinforcing bodies 1 (consisting of a and ib), the reinforcing bodies halves 1a and lb are butted and joined, and then the magnetic head cores 3a and 3b are bonded.
It has been manufactured by coating a bonding material such as an organic adhesive or low-melting point glass thereon, and bonding a pair of reinforcing bodies 1.2 with this bonding material.

However, the above-mentioned conventional magnetic head and its manufacturing method have the following problems:
When an organic adhesive is used as a bonding material, the organic adhesive expands and contracts due to changes in the environment in which the magnetic head is used (temperature, humidity, etc.), and the internal stress generated at this time causes the bond to deteriorate. The stability is impaired and the magnetic head core 3a
, 3b, the butting accuracy and gap accuracy deteriorate, and the adhesive force deteriorates due to changes in the organic adhesive over time, resulting in many accidents in which the pair of reinforcing bodies 1 and 2 peel off.
The drawback was that the reliability of the magnetic head was low.

Furthermore, when inorganic low-melting glass is used as a bonding material, since the low-melting glass and the metallic magnetic head cores 3a, 3b cannot be welded together, the surfaces of the magnetic head cores 3a, 3b (reinforcing body 2 and It is necessary to provide an oxidized layer by oxidizing the opposing surfaces (opposed surfaces of the Because the layer has low mechanical strength, the pair of reinforcing bodies 1゜2 peels off from the oxide layer during the magnetic head processing process, such as Gap Daves polishing, which also reduces the reliability of the magnetic head. There were drawbacks.

SUMMARY OF THE INVENTION Therefore, the present invention provides a magnetic head and a method for manufacturing the same that solves the above problems by arranging a magnetic head core and a bonding material disposed outside the magnetic head core in parallel between a pair of reinforcing bodies. With the goal.

Means and Effects for Solving Problems In the magnetic head and manufacturing method thereof according to the present invention, when a pair of reinforcing bodies are bonded to sandwich a magnetic head core, the bonding material made of an inorganic material is replaced by a magnetic material made of a metal magnetic material. In order to avoid welding to the head core, a bonding material is provided outside the magnetic head core, and the pair of reinforcing bodies are bonded using this bonding material.

Therefore, a magnetic head core made of a metal magnetic material and having a smaller outer diameter than the pair of reinforcing bodies is film-molded onto one of the reinforcing bodies, and a bonding material is placed on the outside of the magnetic head core, and this bonding material is used to reinforce the pair of reinforcing bodies. By joining the bodies, the magnetic head core was sandwiched between the pair of reinforcing bodies.

The above-mentioned pair of reinforcing bodies serve to hold the magnetic head core by sandwiching the thin film-like magnetic head core and increase the mechanical strength of the magnetic head, and the bonding material disposed outside the magnetic head core is At that location, the reinforcing member made of an oxide nonmagnetic material is directly joined to each other.

Example FIG. 1 shows a first embodiment of a magnetic head according to the present invention.

In the figure, 4 is a magnetic head, and approximately a pair of reinforcing bodies 5, 6, .
1ift ki head core 7. It is composed of a bonding material 8 and the like.

The reinforcing bodies 5 and 6 are plates made of an oxide-based nonmagnetic material, and their thickness is appropriately selected to be sufficient to sandwich and reinforce a thin film-like magnetic head core 7, which will be described later. Further, the pair of reinforcing bodies 5.6 have substantially the same shape, and one of the reinforcing bodies 5 is defined at a substantially central position to form half reinforcing bodies 5a and 5b. Note that the reinforcing body half 5a and the reinforcing body 6 are formed with a coil winding groove 10 and a coil winding hole 9 for winding a coil (not shown).

The reinforcing body half-holes 5a and 5b have a magnetic head core half-hole 7a.
, 7b are formed into a film.

The magnetic head cores 7a, 7b are made of a metal magnetic material (Sendust (registered trademark), amorphous, permalloy, etc.), and are formed into a film on the reinforcing body halves 5a, 5b by a thin film method such as sputtering or vapor deposition, and then etched or the like. It is processed and molded into a predetermined shape. At this time, the magnetic head core halves 7a and 7b are formed so that their outer dimensions are smaller than the reinforcing body halves 5a and 5b. Also, the magnetic head core is half-closed 7a.

7b is formed so that the side surface on the side forming the gap is flush with one side surface of the reinforcing body halves 5a, 5b.

Outer reinforcing body half 5a of magnetic head core half-housing 7a, 7b
, 5'b, a bonding material 8 (shown in satin finish in the figure) is disposed. The bonding material 8 is a low melting point glass which is an inorganic material, and the magnetic head core 7a is half-dead.

The reinforcing body halves 5a and 5b on the outside of the reinforcing body 7b are coated by sputtering or the like.

The magnetic head core half-openings 7a, 7b are connected to the gear V-shaped surfaces 11a, 1.
1b sputtered silicon dioxide (S! 02
) etc. to form the magnetic head core 7, and the reinforcing body halves 5a and 5b are melt bonded with low melting point glass and integrated to form the reinforcing body 5. The pair of reinforcing bodies 5.6 are welded together with the magnetic head core 7 in between using a bonding material 8 to form the magnetic head 4.

Therefore, since the pair of reinforcing bodies 5.6 are directly joined by the joining material 8 disposed outside the magnetic head core 7, the joining is ensured and there is no need to provide an oxide layer on the magnetic head core 7 as in the conventional case. . Furthermore, since the bonding material 8 is an inorganic low-melting glass, the bonding force does not deteriorate over time and the reliability of the magnetic head 4 is improved.

A second embodiment of the magnetic head according to the present invention is shown in FIG.

Components that are the same as those in the first embodiment are given the same reference numerals and their explanations will be omitted.

In the figure, 12 is a magnetic head, and magnetic head halves 12a, 1
2b are butted and joined to form approximately a pair of reinforcing bodies 13.
．． 1/1.1itl head core 7. Bonding material 8. It is composed of a welding material 15 and the like. A pair of reinforcing bodies 13 and 14 are made of Mn-2n or Ni-Zn magnetic ferrite 016.
17 and an oxide non-magnetic material 18 and 19 are bonded to each other, and the oxide non-magnetic material 18 is bonded to the oxide non-magnetic material 18 over a predetermined range of the pair of reinforcing bodies 13 and 14 on the operating gap forming side of the magnetic head core 7.
．． 19 is arranged, and the magnetic ferrite material 1 is placed in the other part.
6.17 is installed. The magnetic head core 7 is formed as a film on one of the pair of reinforcing bodies 13 and 14 (for example, the reinforcing body 14) and etched.
When the magnetic head core 7 is formed into a predetermined shape with a smaller outer diameter than the magnetic ferrite material 16 and the oxide nonmagnetic material 18
and horizontally. In addition, a groove 21 is carved in the vicinity of the operating gap 20, and a groove 21 is formed in the magnetic head half.
12a and 12b are welding materials 15 poured into the V-shaped groove 21.
It is welded and joined by.

As mentioned above, the reinforcing bodies 13 and 14 are made of magnetic ferrite U16.
．． 17 and oxide nonmagnetic materials 18 and 19, the magnetic pole part of the magnetic head 12 is made of a metal magnetic material (Sendust (registered trademark),
Magnetic headco 7 made of amorphous, permalloy, etc.)
7, except for the vicinity of the gap, is sandwiched between magnetic ferrite materials 16 and 17 with excellent high frequency characteristics, so that the magnetic head 12 is saturated even with a magnetic recording medium having a high coercive force. This does not occur, and the performance of the magnetic recording medium can be effectively brought out, and the magnetic resistance of the magnetic head core can be made smaller than that of a magnetic head having only a thin film magnetic head core 7.

A first embodiment of the manufacturing capability and method of the magnetic head according to the present invention will be described below with reference to FIGS. 3 to 7.

In Fig. 3, reference numeral 22 denotes a reinforcing body made of an oxide non-magnetic material, and a film of metallic material (sendust, amorphous, permalloy, etc.) is first formed on this reinforcing body 22 to a thickness corresponding to the track width. By etching this, thin-film magnetic head core elements 23 (for example, four pieces) each having the shape of a magnetic head core are formed at predetermined positions. Note that the film formation of the magnetic head core element 23 is not performed by etching, but by forming holes corresponding to the predetermined shape of the magnetic head core element 23 (
) The film may be formed by a masking method using a mask.

Next, the magnetic head core element 23 is attached to the reinforcing body 22 formed with a film.
A plurality of sheets are laminated and welded using a bonding material 24 to form a laminated block 25 shown in FIG. At this time, a plurality of reinforcing bodies 2
The magnetic head core elements 2 are positioned and bonded so that the magnetic head core elements 23 thereof are located at approximately the same position with respect to the stacking direction. Further, low melting point glass is used as the bonding material 24, and the bonding material 24 is disposed on the outer side of the magnetic head core element 23 on each of the plurality of reinforcing bodies 22 by sputtering or the like. They are directly welded and joined via the joining material 24.

Subsequently, the laminated blocks 25 are cut along the lines AA and BB in FIG. 4, and as shown in FIG. A rectangular bar-shaped magnetic head core element assembly 26 including all the plurality of magnetic head core elements 23 is formed. In this bright process, the cutting position of the magnetic head core element assembly 26 is selected so that the outer diameter of the cross section of the magnetic head core element assembly 26 is larger than the shape of the magnetic head core element 23. Therefore, even after the magnetic head core element assembly 26 is formed, each reinforcing body 22 is directly joined via the joining material 24.

Next, the magnetic head core element assembly 26 is cut along its longitudinal direction so that each of the magnetic head core elements 23 arranged in parallel in the magnetic head core element assembly 26 is divided into two at approximately the center position (see FIG. middle, cut along the CC line). Subsequently, coil winding grooves 26a and grooves 27 are carved in each of the cut magnetic head core element assemblies 26, and the gap surfaces are formed by polishing to form a pair of magnetic head core laminated halves 28a of a predetermined shape. , 28b. This pair of magnetic head core laminated half bodies 28a.

28b denotes each magnetic head core half body 29a.

Silicon dioxide (S!
02) etc., and then
By pouring a welding material 30 such as low melting point glass into the groove 27, the welding and bonding is performed with a predetermined strength, forming a magnetic head assembly 31 shown in FIG. For the working temperature of the welding material 30, a material having a softening temperature lower than that of the used bonding material 24 used to form the laminated block 25 shown in FIG. 4 is selected. Furthermore, the method for joining the pair of magnetic head core laminated half-holes 28a, 28b is not limited to the above-mentioned method, and other methods may be used, such as providing a welding material on the opposing surfaces of each half-hole 28a, 28b when joining the gap surfaces, and thereby performing welding and joining. A method may also be used.

Next, the electric head assembly 31 is cut into a predetermined thickness by sandwiching the magnetic head core 29, thereby obtaining a magnetic head 32 shown in FIG.

In the manufacturing method described above, each component of the magnetic head 32 is handled as an assembly in each forming step, so processing and formation is easy and the magnetic head 32 can be mass-produced.

The second embodiment of the method for manufacturing a magnetic head according to the present invention is described in the eighth embodiment.
This will be explained using figures. Note that the same components as in the first embodiment described above are given the same reference numerals, and the description of the same steps will be omitted.

In the figure, 33 is a reinforcing body made of Mn-7n or Ni-Z.
This is a composite body formed by joining an oxide non-magnetic material 35 to a magnetic ferrite material 34 (indicated by matte finish in the figure). A metal magnetic material (sendust, amorphous, permalloy, etc.) is formed on the reinforcing body 33 of this structure to a thickness corresponding to the track width, and then etched to form a thin film approximately in the shape of the magnetic head core at a predetermined position. For example, four magnetic head core elements 23 are formed. During this film formation,
The magnetic head core element 23 is formed by horizontally spanning a magnetic ferrite material 34 and an oxide nonmagnetic material 35 of a reinforcing body 33 which is a composite body. In addition, in the manufacturing process of half-layering the magnetic head core, the working gap surface is formed on the oxide nonmagnetic material 35 side.

Therefore, by using the above manufacturing process, the vicinity of the operating gap 36 of the magnetic head core 29 is sandwiched between the oxide non-argumentative material 35, and the other portion is sandwiched between the magnetic ferrite material 34 (see FIG. 2). Magnetic head 1 shown
(same configuration as 2) is obtained. Therefore, it is possible to mass-produce the magnetic head 37, which does not saturate even with a magnetic recording medium having a high coercive force, can effectively bring out the performance of the magnetic recording medium, and has a small magnetic reluctance in the magnetic head core.

Effects of the Invention As described above, according to the magnetic head and manufacturing method thereof according to the present invention, a pair of reinforcing bodies are directly bonded by a bonding material disposed outside the magnetic head core, and magnetic Since each component of the head is handled as an aggregate, even if the bonding material is a material that does not bond to the magnetic head core, the pair of reinforcing bodies can be firmly and reliably bonded by the bonding material placed on the outside of the magnetic head core. Because they are bonded, the pair of reinforcing plates will not separate even if they are subjected to changes in the usage environment or strong impact during processing, and it is also necessary to provide an oxide layer to weld the bonding material to the magnetic head core. This simplifies the manufacturing process and prevents accidents in which the pair of reinforcing bodies peels off from the oxide layer, etc. Furthermore, since each component of the magnetic head is handled as an assembly in the manufacturing process, the magnetic It has the advantage of being able to produce large quantities of heads, and therefore mass producing magnetic heads with strong mechanical strength and reliability.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a first embodiment of a magnetic head according to the present invention, FIG. 2 is a perspective view of a second embodiment of a magnetic spatula 1- according to the present invention, and FIGS. FIG. 8 is a perspective view for explaining the first embodiment of the method for manufacturing a magnetic head according to the invention according to the manufacturing steps, and FIG. 8 is a perspective view for explaining the second embodiment of the method for manufacturing the magnetic head according to the invention. 9 are exploded perspective views showing an example of a conventional magnetic head. 1.2.5.6.13, 14.22.33... Reinforcement body, 3a, 3b, 7.29... Magnetic head core, 4.1
2.32.37...Magnetic head, 7a, 7b
. 29a, 29b...Magnetic head core half off, 8.24.
...Binding material, 16.17.34...Magnetic ferrite material, 18.19.35...Oxide nonmagnetic material, 23...
Magnetic head core element, 25... Laminated block, 28a
. 28b... Magnetic head core laminated living body, 31... Magnetic head assembly.

Claims (4)

[Claims] (1) A pair of reinforcing bodies made of an oxide non-magnetic material, a magnetic head core made of a metal magnetic material and having a smaller outer diameter than the pair of reinforcing bodies and sandwiched by the pair of reinforcing bodies, and an outer side of the magnetic head core. A magnetic head comprising a bonding material disposed on the substrate and bonding the pair of reinforcing bodies. (2) The magnetic head according to claim 1, wherein the pair of reinforcing bodies are made of a composite body made by bonding a magnetic ferrite material and an oxide nonmagnetic material. (3) Forming a thin film magnetic head core element at a predetermined position on the reinforcing body, and forming a plurality of reinforcing bodies on which the magnetic head core element is formed as a film, so that each of the magnetic head core elements corresponds to approximately the same position. a step of arranging a bonding material on the outside of the magnetic head core element and laminating the magnetic head core element, bonding the plurality of reinforcing bodies with the bonding material to form a laminated block, and cutting the laminated block into a predetermined shape. forming half-shaped magnetic head core stacks, positioning and joining the half magnetic head core stacks so that the respective magnetic head core halves butt each other to obtain a magnetic head assembly; and cutting the magnetic head assembly. A method for manufacturing a magnetic head, comprising the step of forming a plurality of magnetic heads using a plurality of magnetic heads. (4) The reinforcing body is made of a composite of a magnetic ferrite material and an oxide non-magnetic material, and in the film forming process, the magnetic head core element is bonded to the magnetic ferrite material and the oxide non-magnetic material of the composite. 4. The method of manufacturing a magnetic head according to claim 3, wherein the film is formed horizontally on both.