JPS58161127A - Composite magnetic head and its manufacturing method - Google Patents

Abstract

PURPOSE:To eliminate the influence of signal components of the adjacent track and the second adjacent track, and also to improve the track width accuracy, by making the face of the operating gap and the face on which a magnetic core part piece is in contacts with a packed glass unparallel. CONSTITUTION:On the face of a ferrite block 30, plural first grooves 31 are provided in parallel. The second groove 32 whose width is wider than the first groove 31 is overlapped and provided on the first groove 31. Into the groove 31, a metallic magnetic thin plate 33 is inserted. On the upper face of the open groove part of the block 30, low temperature glass 34 is placed, and is heated and melt-stuck. The block 30 is specularly polished by said face, and a gap control material for forming an operating gap is formed. The block 30 is cut off to small pieces 35, 36 and 37, and the small pieces 35, 36 are joined so that the metallic magnetic thin plates 33 conform with each other, through the gap control film, and are heated and melt-stuck. Subsequently, a bonding ferrite block 39 formed as one body is cut to prescribed width, a magnetic head core 40 is manufactured, and bend-working is applied to the slide face of a tape, by which a magnetic head 41 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head and a method of manufacturing the same, and particularly to a magnetic head suitable for recording and reproducing high frequency signals such as a video head and a method of manufacturing the same.

Nasal Notes - There is an extremely strong demand today for technological advancement, especially for higher density magnetic recording. In order to meet this demand, it is necessary to increase the coercive force of the magnetic recording medium and increase the magnetic flux I.
In addition to IT and lower noise, significant improvements in the le&characteristics and reproduction sensitivity of magnetic heads have become major am.

It is well known that in high-density magnetic recording and reproducing devices, it is advantageous to increase the coercive force (Ie) of the magnetic recording medium. However, 2. In order to record information on a magnetic recording medium with high coercive force, a magnetic field with high strength and sharp distribution is necessary. Ferrite has its saturation magnetic flux density B1
1 is about 4,000 to 5,000 Gauss, there is a limit to the strength of the recording magnetic field that can be obtained. be.

In order to solve this drawback, efforts have been made to develop materials to replace 1- and 7-elite, and currently, metallic magnetic materials are used as materials with high magnetic permeability and saturation magnetic flux density. However, metal magnetic alloys have a low resistivity, so when used in high frequency applications, they have the disadvantage of reduced magnetic permeability due to eddy current loss. Therefore, when a metal magnetic material is used as a magnetic head for high frequency recording and reproducing, thin plates or thin films of the metal magnetic material are used in a stacked manner.

In view of the above-mentioned developments in the prior art, various metal magnetic materials and thin plate technology have been developed, and various results have been obtained. For example, the development of super-quenching (splat cooling) technology has made it possible to make amorphous magnetic alloys thinner. Recently, F・-AJ-81 alloy (
It is becoming possible to make thin sheets of Sendust). Furthermore, advances in processing technology have made it possible to cut thin sheets from bulk Sendust alloy.

The metal magnetic alloy thin plate obtained in this way retains the high saturation magnetic flux density and high magnetic permeability characteristics that are characteristic of metal magnetic materials, and also has excellent high frequency characteristics, so it is suitable for high frequency magnetic applications. It has been reported that it is promising as a head material.

As for magnetic heads using metal magnetic thin plates, a laminated head as shown in FIG. 1 or a composite salt with ferrite as shown in Section 2 has been proposed.

The magnetic helad core shown in FIG. 1 has a thickness of, for example, 10
TI, Cu, Be, etc. are applied to the magnetic core piece 11.11', which is made by laminating metal magnetic material thin plates 10 of ~50/jm adhesively laminated with resin or the like, to a predetermined thickness as a gap regulating material. The magnetic head core is then laminated with a predetermined gap maintained through the gap regulating material to form a magnetic head core. Here, reference numeral 12 denotes a track width determining groove, which is filled with a reinforcing material such as resin. Further, 13 is a reinforcing portion filled with resin or the like at the rear of the core. 14 is a window for coil winding.

However, such magnetic rad cores have the disadvantage of poor wear resistance. Furthermore, the adhesive strength between the thin metal magnetic material plates 10 or between the magnetic core pieces 11 and 11' is weak, and there are many drawbacks in manufacturing.

In contrast, recently, a composite magnetic head, which combines ferrite and metal magnetic material, as shown in FIG. 2, has been proposed. This magnetic helad core is constructed by providing #ll in the tape running direction on the tip of the ferrite core piece 15, 15' and on the magnetic tape sliding surface of the core, inserting a metal magnetic thin plate 16 into this groove, and inserting a metal magnetic thin plate 16 into the groove. A non-magnetic material 17° and 17' is provided in the portions excluding the gap, and a predetermined gap is maintained between the metal magnetic thin plates 16 and 16 via a gap regulating material, and the metal magnetic thin plates 16 and 16 are bonded with glass. Here, 18 is a coil winding groove.

The magnetic helad core with this structure has an operating gap made of metal magnetic material, has excellent wear resistance, and
It exhibits excellent recording and reproducing characteristics as a magnetic head for high coercive force magnetic bone media.

However, in the composite magnetic head having the above structure, the wear resistance of the non-magnetic material 17, 17' in the vicinity thereof is inferior to that of the metallic magnetic material in the working gap part. For this reason, when sliding with the magnetic tape for a long time, the non-magnetic material 1 near the working gap
7.17' is recessed, and there is a drawback that the recording and reproducing characteristics deteriorate due to spacing loss. Furthermore, since the boundary layer between the ferrite core piece 15.15' and the non-magnetic material 17, 17' is macroscopically parallel to the working gap, the ferrite core piece 15.15' and the non-magnetic material 17. The interface with 17' acts as a pseudo gap. Therefore, adjacent or adjacent signal components are reproduced,
This has the disadvantage that noise components increase.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the conventional magnetic head structure as described above, and to provide a composite magnetic head suitable for high-density magnetic recording and reproduction, and a method for manufacturing the same.

A first feature of the present invention is that, in a composite magnetic head having a track width narrower than the width of the magnetic held core, the working gap of the magnetic held core and at least one of the boundaries between the ferrite core and the non-magnetic material are The point is that they are made non-parallel.

Further, the feature of the silk 2 of the present invention is that a first processing groove is formed in the ferrite substrate, and a second processing WI#'f having a width wider than the first processing groove is formed by forming a first processing groove on the ferrite substrate. : forming in random order, then inserting a thin plate metal magnetic material into the first processing groove,
The gap between the second processed groove and the thin metal magnetic material is filled with filler glass to fix the ferrite substrate and the thin metal magnetic material, and the bale and the thin metal magnetic material are fixed. The point is that the above-mentioned composite magnetic head was created by cutting out a ferrite substrate.

Furthermore, the third feature of the present invention is that the first processed groove and the second processed groove are formed with an azimuth angle.

Hereinafter, a composite magnetic head according to the present invention will be explained using examples. FIG. 3 shows a first embodiment of the invention.

The composite magnetic head of this embodiment includes a pair of magnetic core pieces 2
2.22' high magnetic permeability ferrite block 20, a metal magnetic body 21 formed on the working gap forming surface and embedded in the fC groove and having a high aia rate of saturated m*, and the pair of magnetic core pieces 22. .22' are abutted and welded together at the working gap abutting surfaces via a non-magnetic gap regulating material thin film layer. Additionally, one or both of the surfaces in contact with the filling glass 23 and the magnetic core pieces 22 and 22' are formed so as not to be parallel to the working gap created by the metal magnetic body 21. Further, the metal magnetic body 21 is embedded in the ferrite core to have the same volume H as the magnetic herad core.

As described above, in the composite magnetic head of this embodiment, since the working gap and the surface where the magnetic core pieces 22, 22' contact the filling glass 23 are non-parallel, the signal of the adjacent or adjacent track is The influence of the components can be removed, and the original performance of the magnetic head can be obtained. Further, since the track width TV of the test stand type magnetic head is determined by the thickness of the metal magnetic body 21, a very high track width accuracy can be obtained. In addition,
The amorphous metal magnetic ribbon manufactured by the splat cool method has a thickness of 20 μm, and the difference in thickness is ±2 μm.

FIG. 4 shows a second embodiment of the present invention, which differs from the first embodiment in that the metal magnetic body 21 is inclined with respect to the working gap by an azimuth angle. Note that the metal magnetic material 21 and the ferrite block 20 constitute a closed magnetic path of the ring-shaped magnetic head, as in the case of FIG. 3.

FIG. 5 shows a 3% embodiment of the invention. This example is
This embodiment differs from the first embodiment in that the length of the metal magnetic body 21 in one direction is shorter than the winding groove. Note that the metal magnetic material 21 and the ferrite block 20 constitute a closed magnetic path of the ring-type magnetic head, as in the case of FIG. 3.

The second aspect of the present invention described above. It is clear that the same effects as in the first embodiment can be obtained in the @3 embodiment.

In addition, for the ferrite magnetic material, Mn-Zn ferrite with high magnetic permeability is used, and for the metal magnetic material, F・-A7-other system, Fm-8I system, Fe
-Ni-based magnetic alloy or Fe-Co-81-B
A thin plate or thin film of an amorphous alloy magnetic material such as Co-Zr or Co-Zr is used. Further, the filling glass is not particularly limited as long as it has a coefficient of thermal expansion comparable to that of ferrite.

Next, a method for manufacturing a magnetic head according to the present invention will be explained in detail using examples.

FIGS. 6(a) to 6(f) show an embodiment of the method for manufacturing the composite magnetic head described in FIGS. 3 and 5, and are schematic illustrations of the main steps thereof. The manufacturing steps of this example will be sequentially explained below.

Step (a): A rectangular parallelepiped ferrite block 30 made of polycrystalline Mn-Zn ferrite and having orthogonal sides a, b, and c is prepared. The block 30 uses polycrystalline ferrite having a saturation magnetic flux density of 5500 Gauss and a magnetic permeability of about 900 at 5 MHz. Also, side 1 and side 1 are
The length is long enough to cut out a plurality of magnetic heads (more than ten to several dozen), and the side C has a thickness of about 1/2 or more of the width of the magnetic helad core.

Next, several spears 31 of a predetermined depth are provided in parallel on one AB surface of the block 30.

(ii) A second groove 32 having a predetermined depth and a width wider than the first groove 31 is provided so as to overlap the first groove 31. At this time, the cutting edge angle of the blade used is 30° to 30° relative to blade leakage.
Process within a range of 80°.

Step (/→; Insert a metal magnetic thin plate 337 having a predetermined thickness into the first #l 131 of the ferrite block obtained in step (b). As the material of this metal magnetic thin plate 33, for example, In crystalline magnetic alloys, F・~Co-8
The i-B system is Fe-Aj-8 in the crystalline metal magnetic alloy.
1 system is used. The thickness of the metal magnetic thin plate 33 corresponds to the track width, and was about 10 to 30 pm. Note that the first processed groove 31 is several μml thicker than the metal magnetic thin plate 33! Process widely.

Next, the ferrite block 3 into which the metal magnetic thin plate was inserted
A low-temperature glass 34 for fixing the metal magnetic thin plate and filling the groove is placed on the upper surface of the open groove portion of No. 0, and is welded by heating. For example, if the metal magnetic thin plate 33 is an amorphous magnetic alloy, the welded glass must be below the crystallization temperature of the amorphous magnetic alloy, and in this case, a low melting point glass such as PB glass is used. use

Step): The ferrite block 30 to which the metal magnetic thin plate 33 is fixed with the low-temperature glass 34 is mirror-polished with its &b surface. After that, a gap regulating material for forming an operating gap is formed on the #ab surface. Next, the spinning ferrite pronk 30 is completely cut into predetermined small pieces 35, 36, and 37, and further a wire-wound $38 is processed into a -5 small piece (here, small piece 35) to a predetermined depth.

35.36 Small pieces separated at Uni process (E);
are heated and welded through a gap regulating film so that the gold Ili magnetic thin plates 33 are aligned. Note that when heating and welding, the welding glass is not used, but the filling glass 34 is used for bath deposition. In addition, the alignment accuracy of the metal magnetic thin plate 33 is 1~
Although it is in the range of 2 μm, it is also possible to intentionally shift it for effective trunk formation.

Step (f): The integrated bonding ferrite resin 39 is cut into a predetermined width to produce a magnetic core 40. During this separation 7, processing is performed so that the metal magnetic thin plate 33 is located at the center of the core. After that, magnetic head core 4
A magnetic head 41 is manufactured by bending the sliding surface of the tape 0 so that the track width is the short side of the metal magnetic thin plate 33. In this way, the first and third embodiments of the present invention, that is, composite magnetic heads having structures as shown in FIGS. 3 and 5 are obtained.

In the above explanation, the gap regulating film was provided after cutting the ferrite block 30 into small pieces, but before cutting it into small pieces, that is, after polishing the ferrite block 30 to a mirror surface in step 1). A gap regulating film may be provided thereon.

Next, another embodiment of the method for manufacturing a composite magnetic head of the present invention, that is, a method for manufacturing the composite magnetic head illustrated in FIG. 4 will be described. FIGS. 7A to 7F are diagrams schematically showing the manufacturing process of this embodiment.

Process (a): High magnetic permeability M with orthogonal x, y, and z sides
An n-Zn ferrite single crystal substrate 50 is prepared. Side X,
Y is long enough to cut out a large number of magnetic rad cores, and side 2 is about 100 μm to 2 mm wider than the width of the magnetic rad cores.
The thickness should be about 00 μm. The first machined grooves 51 are machined in large numbers in two depth directions on the surface of one force represented by sides X and Y, and at this time, are machined so as to have an azimuth angle θ with side Z.

Step (b): A second machining groove 52 which is narrower and deeper than the first machining groove 51 is superimposed on the center of the first machining groove 51 having an azimuth angle θ and parallel to the first machining groove 51. Process the same number.

Mach &H; Ferrite block 5 grooved in the previous process
0, a separately prepared metal magnetic thin plate 53 is inserted into the second processed groove 52 and fitted. The metal magnetic thin plate used here is, for example, an F-A/-8L (Sendust) crystalline metal magnetic material, and is cut out in a range of 20 to 100 pm so that the metal plate thickness corresponds to the track width. .

Next, glass 54 filling the periphery of the metal magnetic thin plate 53 is placed so as to sandwich the metal magnetic thin plate 53. and glass 5
4 is heated and melted to fix the metal magnetic thin plate 53.

Step (b): After mirror-polishing the XY plane of the ferrite block 50 in which the metal magnetic thin plate 53 is fixed by the filling glass 54, that is, the upper surface of the ferrite block 50, the winding groove 58 is processed, Furthermore, a small piece 55.56゜5
7. Separate completely. Next, cut out the small piece 56゜5
810 for gap regulation on the surface of 7. is formed to a predetermined thickness by sputtering.

Step (e): The small pieces 55 and 56 obtained in the previous step are heat welded through the gap regulating film so that the metal magnetic thin plate 53 is aligned with the small pieces 55 and 56. In this way, a bonding ferrite block 59 is produced.

Step (f): The bonding ferrite block 59 produced in the previous step is cut into a predetermined size and the magnetic helad core 6 is cut.
Create 0. In addition, when cutting, the metal magnetic thin plate 53 is placed in the center of the magnetic helad core. Next, the tape sliding surface on which the metal magnetic thin plate 53 is positioned is curved.

In the above description, the gap regulating film was formed after cutting the ferrite block 50 into small pieces, but the gear knob regulating film may be formed before cutting the ferrite block 501h into pieces.

Through the above steps, a composite magnetic head 61 having a structure similar to that shown in FIG. 4 is obtained.

As explained above, the composite magnetic head according to the present invention has the following effects.

(1) Since the diaphragm υ part of the high transmittance ferrite is non-parallel to the working gap, the influence of signal components of liI and adjacent tracks can be extremely reduced.

(2) Since the thickness of the metal magnetic thin plate corresponds to the track width, it is possible to improve the track width accuracy.

Furthermore, the method for manufacturing a composite magnetic head according to the present invention has the following effects.

(31 Fixing the metal magnetic thin plate and filling the filling glass can be done in one operation.

(4) Since the opening portion (for example, 32 in FIG. 6(b)) is made large, the generation of air bubbles in the filled glass can be greatly reduced.

(5) It has excellent mass productivity and can stabilize performance.

[Brief explanation of the drawing]

1 and 2 are perspective views showing the structure of a conventional pot head, and FIGS. 3, 4, and 5 are perspective views showing the structure of a conventional pot metal head, respectively. The perspective views of the second and third embodiments, and FIGS. 6 and 7 are process diagrams for explaining the manufacturing process of the composite magnetic head of the present invention, respectively. 20 High magnetic permeability ferrite block, 2] Metal magnetic material, 22.22' Magnetic core piece, 23 Filling glass, 30 High magnetic permeability ferrite block, 31 1st
groove, 32 second groove, 33... metal magnetic thin plate, 34
・Low temperature (full*) glass, 35.36.37 Ferrite block small piece, 38 Winding groove, 39...Bonding ferrite block, 40・Magnetic helad core, 41
...Magnetic head, 50 High magnetic permeability ferrite single crystal substrate, 51 First processed groove, 52...1s2 processed groove,
53・Metal magnetic thin plate, 54 Complete Jr), 55.5
6.57 High magnetic permeability ferrite single crystal small piece, 58-4 wire screw, 59 Bonding ferrite block, 60 Magnetic helad core, 61 Magnetic head patent attorney Michi Hiragi Fig. 1 Fig. 2 Fig. 2 Figure 3 Fang 4 Figure 1 12 Fang 5 Koku

Claims (1)

[Scope of Claims] (1) In a composite magnetic head having a track width narrower than the magnetic head core width, a head core portion is formed by opposing a pair of ferrite magnetic materials, and an opposing rad core portion is embedded in the rad core portion. an actuating gap abutting portion made of a pair of metal magnetic materials, a non-magnetic film for gap regulation formed at least on the auxiliary actuating gap abutting portion, and a non-magnetic film provided on the opposing portion of the pair of ferrite magnetic materials; A filling and fixing part made of a non-magnetic material is provided, and at least one of the boundary surfaces between the helad core part and the spinning filling and fixing part is non-parallel to the working gap abutting part. A composite magnetic head with the following features: (2) In a rectangular parallelepiped high magnetic permeability ferrite, when the two sides forming the top surface are a, b, and the side C perpendicular to the top surface, on the plane defined by the sides a and b, and on the side a,
A number of first grooves are formed parallel to either one of b at predetermined intervals, overlapping the first groove 1, and having a width wider than the first groove,
and a first step of forming second grooves whose bottom surfaces are not perpendicular to the side surfaces in random order, inserting a metal magnetic material into the first groove of the ferrite rectangular parallelepiped, and then inserting a non-magnetic reinforcing material into the second groove. filled with, and
A second step of fixing the metal magnetic material to the ferrite, a surface defined by the side 1°b of the ferrite block in which the gold m1tt material and the non-magnetic material obtained in the second step are embedded. a third step of mirror polishing to a predetermined thickness; The second groove is a fourth groove in which a coil winding groove is provided directly in the image, and then the ferrite block is cut into a predetermined size and shape parallel to the coil winding groove to form a small block. A fifth step of forming a non-magnetic thin layer on the mirror-polished surface of the small block and abutting and integrating the small block through the same; forming a magnetic recording medium sliding surface of the integrated block into a curved surface; After processing, it is cut into individual pieces, and the magnetic recording medium sliding portion of the single magnetic head is finished with a curved surface, and then the coil winding lI
1. A method for manufacturing a composite magnetic head, characterized in that the manufacturing method includes a sixth step of performing step I. (s+m) The fourth and fifth steps, which are located between the third step and the sixth step, respectively include the step of forming a non-magnetic layer on the mirror-polished surface of step 1, and the step of forming a non-magnetic layer through the non-magnetic layer. 1. A groove for coil winding is set perpendicular to the second cutter, and after death, the ferrite block is cut into a predetermined size and shape parallel to the groove for coil winding to form a small block. A method for manufacturing a composite magnetic head according to the patent item, characterized in that the step of butting and integrating small blocks of When the two sides forming the top surface are X and Y, and the side perpendicular to the top surface is 2, on the plane defined by the sides X and Y, the side X
, Y and have a desired azimuth angle, and within the first groove, a plurality of first grooves are formed which are wider than the first groove and whose bottom surface is not perpendicular to the side surface. 2
A first step of forming grooves in random order, inserting a metal magnetic material into the first i11, and further forming grooves in the second groove.
a second step of filling the cage with a non-magnetic reinforcing material and fixing the metal magnetic material to the ferrite; the side of the ferrite block in which the metal magnetic material and non-magnetic material obtained in the second step are embedded; X. a third step of mirror-polishing the surface defined by Y to a predetermined thickness; a fourth step of forming a non-magnetic thin layer on the mirror-polished surface;
Step: A coil winding groove is provided on the surface of the spun nonmagnetic thin layer perpendicular to the first and second grooves, and the coil winding groove is cut into a predetermined size and shape parallel to the coil winding groove. a sixth step of butting and integrating the nine small blocks cut in the fifth step with the ferrite and the small blocks so that the metal magnetic material matches through the non-magnetic thin layer; The magnetic recording medium sliding surface of the block integrated in the sixth step is curved and then cut into individual pieces, and the magnetic recording medium sliding portion of the single magnetic head is finished and curved, and then coil winding is performed. 7. A method for manufacturing a composite magnetic head, characterized in that the composite magnetic head is manufactured by the seventh step. (5) Fourth and fifth steps between the third step and the sixth step
Each of the steps includes applying the first to the mirror-polished surface. A step of providing a coil winding groove perpendicular to the second groove, and then cutting parallel to the coil winding groove to a predetermined size and shape to form a small block; 5. The method of manufacturing a magnetic head according to claim 4, further comprising the step of forming a magnetic thin layer.