JPH0529961B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a magnetic head and a method for manufacturing the same, and in particular to a magnetic head suitable for use as a magnetic head for an FDD (floppy disk drive), and advantages of the magnetic head. It relates to a manufacturing method.

(Background Art) In recent years, FDDs have been trending toward higher density recording and larger capacity, and for this reason, bulk type magnetic heads have become mainstream, and those with the structure shown in Figure 15 are generally known. It is being

That is, in the figure, numerals 2 and 4 are a recording/reproducing ferrite core having a recording/reproducing track section 6, and an erasing ferrite core having an erasing track section 8, respectively.
Each has a structure in which two ferrite members 12, 14 and 16, 18 each having a leg portion 10 (see FIG. 16) are integrally joined, and these ferrite cores 2, 4 are integrally joined. As a result, a ferrite core assembly 20, which forms the main body of the magnetic head, is constructed. A pair of non-magnetic ceramic supports 22 and 24 are fixed to sandwich the ferrite core assembly 20, a gimbal 26 is fixed to the ceramic supports 22 and 24, and the ferrite core assembly 20 is attached to the ceramic supports 22 and 24. It is supported by the gimbal 26 via the bodies 22 and 24, while the back core 28 (first 19) are fixed to each other, and an FPC (flexible printed circuit) 32 is connected to a coil 30 wound around one leg 10 of each of the ferrite cores 2 and 4, and the magnetic head shown in the figure is It is configured.

As shown in FIGS. 16 to 19, such a conventional magnetic head consists of a ferrite core assembly 20 and two ceramic supports 22 and 24, each manufactured separately. After joining, the gimbal 26 is fixed to the joined body, and the coil 30 is inserted into the leg part 10 of each ferrite core 2, 4. After that, each ferrite core 2,
After fixing the back cores 28, 28 between the legs 10, 10 of 4, and bonding the FPC 32 to the gimbal 26, the FPC 32 is soldered to each coil 30. In order to define the depth length of the magnetic gap in each track section 6, 8 for recording/reproducing and erasing, when the ferrite core assembly 20 is bonded, a ferrite core is placed on the disk sliding side of the ferrite core assembly 20. After bonding the ceramic supports 22 and 24 to the bonded body 20, it is necessary to perform depth polishing on the disk sliding surfaces of those bonded bodies, which increases the number of man-hours required to manufacture the magnetic head. There is a problem in that the manufacturing cost increases accordingly, and since it is necessary to use ceramic supports 22 and 24 having a complicated structure with an L-shaped cross section, this also increases the manufacturing cost of the magnetic head. As the price got higher, I started having problems.

In addition, when performing depth polishing on the joined body of the ferrite core joined body 20 and both ceramic supports 22 and 24, it is difficult to actually measure the depth length, so there is a problem that the depth length accuracy after polishing tends to vary. As a result, there was a problem in that the variation in the electromagnetic conversion characteristics of the magnetic head became relatively large.

(Problem to be solved) The present invention has been made against the background of the above, and the problem to be solved is depth polishing for defining the gap length of the magnetic gap in the track portion. A structure of a magnetic head that requires only one processing, can stably obtain good depth accuracy, and can employ an extremely simple structure as a support member made of non-magnetic material such as ceramics, and The object of the present invention is to provide an advantageous manufacturing method thereof.

(Solution Means) In order to solve this problem, in the present invention, at least two ferrite members are butted horizontally and integrally joined, and the abutting portion between adjacent ferrite members is provided. (b) a flat plate-like ferrite bonded body having a track portion having a magnetic gap having a predetermined magnetic gap length; (c) a support member made of a non-magnetic material that is fixed to the non-disk sliding side surface of the ferrite bonded body and supports the ferrite bonded body; The magnetic head was constructed so as to include the magnetic head.

Further, in the first method of the present invention, at least one of the abutting surfaces of the first and second ferrite members is subjected to a gap process for defining the magnetic gap length, and also for defining the track formation. After performing the track processing, the first ferrite member and the second ferrite member are integrally joined at their abutting surfaces, and a magnetic gap with a predetermined magnetic gap length is installed at the abutting portion between the ferrite members. A ferrite bonded body having a track portion having a track portion is prepared, and the disk sliding side surface of the ferrite bonded body is polished to define the depth length of the magnetic gap. Fixed to the sliding surface of the disk to form a closed magnetic path in which the magnetic gap of the track portion is part of the magnetic path, and to support the ferrite bonded body on the non-disk sliding side of the ferrite bonded body. It was decided to fix the support member made of non-magnetic material.

Furthermore, in the second method of the present invention, in the first, second, and third ferrite members that are butted against each other in the same direction, the abutment surfaces of the first ferrite member and the second ferrite member are and at least one of the abutting surfaces of the first ferrite member and the third ferrite member, respectively, are subjected to gap processing to define the magnetic gap length, and track processing to define the track shape. After that, the first, second, and third ferrite members are integrally joined at their corresponding abutting surfaces, and a magnetic gap of a predetermined magnetic gap length is formed at the abutting portion between each adjacent ferrite member. A ferrite bonded body having track portions having the same structure is prepared, and the disk sliding side surface of the ferrite bonded body is polished to define the depth length of the magnetic gap of each of the track portions, while a separately prepared ferrite back core is It is fixed to the non-disk sliding side surface of the ferrite block assembly to form two closed magnetic paths in which the magnetic gaps of each track portion are part of the respective magnetic paths, and the non-disk sliding side surface of the ferrite block assembly is A supporting member made of a non-magnetic material for supporting the ferrite bonded body was fixed to the side surface.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples thereof will be described in detail based on the drawings. Note that here, the first, second and third ferrite members 4 as shown in FIG.
0, 42, and 44 are butted against each other in the same direction to form a flat plate-shaped ferrite joined body 46, and at the butt portion between the first ferrite member 40 and the second ferrite member 42, While a recording/reproducing track portion 48 is formed, at the abutting portion between the first ferrite member 40 and the third ferrite member 44,
Regarding the magnetic head for FDD according to the present invention having a structure in which an erasing track portion 50 is formed,
The manufacturing method according to the present invention will be described in detail, and its structure will be specifically clarified.

That is, in manufacturing the magnetic head shown in FIG. 1, first, in order to obtain the first, second, and third ferrite members 40, 42, and
First, second and third ferrite blocks 5 each having a longitudinal rectangular shape as shown in FIGS.
2, 54 and 56 are prepared respectively.

Here, the ferrite material for each of the first to third ferrite blocks 52, 54, 56 may be a conventional high magnetic permeability ferrite material, such as a single crystal or polycrystalline material such as Mn-Zn ferrite or Ni-Zn ferrite. Although bodies are preferably employed, complexes thereof are also advantageously employed.

Furthermore, for each of the first, second and third ferrite blocks 52, 54, 56, the desired ferrite members 40, 42, 44 can be cut out in three pieces in the longitudinal direction and in three stages in the thickness direction. The size of each is set as follows,
Their sizes are as follows: ferrite members 40, 42,
It is possible to change it appropriately according to the number of cutouts of 44.

The first ferrite block 52 prepared to obtain the first ferrite member 40 has a magnetic gap forming portion as shown in FIG. A mask 60 is applied in a band shape with the mask 60 exposed, and with the mask 60 applied,
The magnetic gap 6 for recording and reproduction in the recording and reproduction track section 48 is held against the abutting surface 58.
Etching is performed to define a magnetic gap length of 1 (see FIG. 1). As a result, the abutting surface 58 of the ferrite block 52
A gap length defining groove 63 having a depth corresponding to the gap length of the magnetic gap 61 for recording and reproducing is formed in the gap (see FIG. 4).

After the gap length defining groove 63 is formed, the abutting surface 58 of the ferrite block 52 is then formed.
On the other hand, as shown in FIG. 4, a mask 64 having convex portions 62 for defining the track width of the track portion 48 for recording and reproducing is provided with each convex portion 62 in the gap defining groove 63. It is given so that it extends. Then, while the mask 64 is applied, the abutting surface 58 is etched to a predetermined depth,
A track-forming protrusion 66 (see FIG. 7) having the track width of the recording/reproducing track portion 48 is formed at the portion of the mask 64 where each protrusion 62 is provided.

Further, in parallel with or before and after the gap machining and track machining on the abutting surface 58 described above, the abutting surface of the first ferrite block 52 that is abutted against the third ferrite block 56 (the surface opposite to the abutting surface 58 ), an etching operation is performed to define the gap length of the erasing magnetic gap 67 (see FIG. 1) in the same manner as described above while the alignment with the abutting surface 58 side is strictly controlled. A gap defining groove having a depth corresponding to the gap length of the magnetic gap 67 for erasing is formed, and the track width of the erasing track portion 50 is An etching operation is performed to define the width of the track forming convex portion 68 (see FIG. 7) having the track width of the erasing track portion 50.

Here, as mentioned above, since the first ferrite members 40 are each three in the length direction and the depth direction of the first ferrite block 52, the track of the recording/reproducing track section 48 is A corresponding set of a track forming convex part 66 having a width and a track forming convex part 68 having a track width of the erasing track part 50 has a width of 3 in the longitudinal direction and the thickness direction of the first ferrite block 52, respectively. A group will be formed.

In addition, here, for forming the masks 60, 64, etc. for the etching, known methods such as screen printing are selected and adopted as appropriate from the viewpoints of required accuracy and economical efficiency, but among them, Due to pattern accuracy and process simplicity, an exposure method using a photoresistor is preferably employed.

Furthermore, the above-mentioned etching process is carried out by ordinary electric field etching or chemical etching, but the applicant of the present application previously filed a patent application filed in 1983-
No. 222388, and it is particularly advantageously carried out by chemical etching treatment using a phosphoric acid-based aqueous solution.

On the other hand, the second and third ferrite blocks 54 and 56 prepared to obtain the second and third ferrite members 42 and 44 have a butt with the first ferrite block 52. With respect to the surfaces 70 and 72 (see FIG. 5), as shown in FIG.
A plurality of strips of a predetermined depth (here,
3) gap joining grooves 74 are formed by cutting. The second and third ferrite blocks 54 and 56 having the gap joining grooves 74 formed in this manner are connected to the respective abutting surfaces 70 and 7.
2, the first ferrite block 52
are abutted against the abutting surface 58 on which the track-forming convex portion 66 is formed and the abutting surface on which the track-forming convex portion 68 is formed, respectively,
By a bonding technique based on a solid phase reaction, the parts that come into contact with each other are sintered and bonded to each other.

After the ferrite blocks 52, 54, 56 are joined by such solid phase reaction, a glass rod is inserted into each gap joining groove 74 formed in the second and third ferrite blocks 54, 56, and is melted. Then, the space between the abutting surfaces of each ferrite block is filled with glass, and the seventh
As shown in the figure, a magnetic gap 61 for recording and reproducing is filled with bonding glass 80 between each track forming convex portion 66 of the first ferrite block 52 and the abutting surface 70 of the second ferrite block 54. are formed, and each track forming convex portion 68 and the third ferrite block 56 are formed.
Between the abutting surfaces 72 of the bonded glass 80
A block assembly 82 is produced in which a magnetic gap 67 for erasing filled with is formed. Note that, in place of the glass 80, it is also possible to fill the space between the abutting surfaces of each ferrite block with another non-magnetic material having an adhesive function.

First, second and third ferrite blocks 5
By joining 2, 54, 56, a block joined body 8 is formed.
2 is obtained, the block assembly 82 is cut along the cutting line 84 as shown in FIG. The ferrite bonded body 46 is cut into a plurality of pieces in the width direction, and has approximately the same thickness as the target ferrite bonded body 46, as shown in FIG.
One block assembly 86 is cut out.

When the block assembly 86 is cut out, the magnetic gaps 61 and 67 are attached to the disk sliding side surface, that is, the surface facing the track forming convex portions 66 and 68 (the upper surface in FIG. 8). A polishing process (depth polishing process) is performed so that the magnetic gap 61, 67 has a predetermined depth so as to face the sliding side surface, and in particular, the depth length of the magnetic gap 61 for recording and reproduction is a predetermined depth.
Further, a mirror polishing process is performed to finish the sliding side surface of the disk to a mirror surface, and as a result, as shown in FIG. 9, the first ferrite block 5
3 facing the disk sliding side at the abutting portion between 2 and the second ferrite block 54.
Three recording/reproducing track portions 48 are formed, and three erasing track portions 50 facing the disk sliding side are formed at the abutting portion between the first ferrite block 52 and the third ferrite block 56. It is formed. Also, before and after this, as shown in FIG. 9, ferrite blocks 52 and 54 are attached to the disk sliding side surface of the block assembly 86, corresponding to each set of track portions 48 and 50, respectively. , 56, three grooves 88 are formed in order to improve the sliding characteristics (particularly the adsorption characteristics) with the disk.

Note that when forming the gap bonding grooves 74 for the second and third ferrite blocks 54 and 56, the gap bonding grooves 74 are
4 facing the tips of the track forming convex portions 66, 68, as shown in FIG. 10a, each magnetic gap 61, 67
The depth position of the gap joining grooves 74 is defined by the gap joining grooves 74, and the gap joining grooves 74 are arranged so as to be slightly off to the tip side of the track forming convex portions 66, 68 of the first ferrite block 52.
4 is formed, the depth positions of the magnetic gaps 61 and 67 are defined by the tip edges of the track forming convex portions 66 and 68, as shown in FIG. 10b. .

Therefore, when the depth position of the magnetic gap 61, 67 is defined by the gap joining groove 74,
Directly from the joint portion of each ferrite block facing the side surface of the block joint body 86, and from the magnetic gap 6
The depth position of 1,67 is the track forming convex part 6
6 and 68, the block joint 86 is determined from the relationship determined in advance between the front edge positions of the track forming convex portions 66 and 68 and the thickness dimension of the block joint 86. By measuring the thickness, etc., these magnetic gaps 61,
Here, the depth length of the magnetic gears 61 and 67 can be actually measured according to those depth length measurement methods, and the depth polishing process including the mirror polishing process is performed. It's summery.

When the disk sliding side surface of the block assembly 86 is finished to a mirror surface and the groove 88 is formed on the disk sliding side surface, the block assembly 86 is cut along the cutting line 90 as shown in FIG. The block assembly 86 is divided into three parts in the longitudinal direction, and each of the three parts of the block assembly 86 is chamfered and polished to improve the sliding characteristics with the disk. As a result, a ferrite bonded body 4 having the desired structure as shown in FIG.
6, that is, the first, second, and third ferrite members 40, 42, and 44 are butted against each other in the same direction and are integrally joined, and the first ferrite member 40 and the second ferrite member 42 are A track portion 48 for recording and reproduction is formed at the abutting portion between the first ferrite member 40 and the third ferrite member 44, and a track portion 50 for erasing is formed at the abutting portion between the first ferrite member 40 and the third ferrite member 44.
A flat plate-shaped ferrite bonded body 46 having a structure in which .

On the other hand, apart from the production of such a ferrite bonded body 46, the ferrite blocks 52, 54,
An E-shaped back core 94 with three legs 92 as shown in FIG _.
A longitudinal rectangular support block 104 (see FIG. 1) as a support member is made of non-magnetic ceramics such as
is created.

The legs 9 at both ends of the back core 94
A recording/reproducing coil 96 is inserted into one of the coils 2 and 92, and an erasing coil 97 is inserted into the other.
However, as shown in FIG. 1, the recording/reproducing and erasing track sections 48 and 50 are formed on the distal end surface of each leg 92 using an adhesive such as glass or resin. The ferrite members 40, 4 constituting the ferrite bonded body 46 correspond to
The track portion 4 for recording and reproducing is integrally fixed to the non-disk sliding side surface of each of the disks 2 and 44.
A closed magnetic path in which the magnetic gap 61 of No. 8 is part of the magnetic path, and a magnetic gap 67 of the erase track section 50.
The support block 104 is integrally formed on the non-disk sliding side surface of the ferrite bonded body 46 at a predetermined distance from the back core 94. It is fixed with adhesive.

Then, the back core 94 and the support block 104
After the is joined to the ferrite assembly 46, the gimbal 106 is adhered to the back surface of the support block 104, the FPC 108 is attached, and the coils 96 and 97 are soldered to the FPC 108, as shown in FIG. A magnetic head for FDD with a structure similar to the above is completed.

The E-shaped back core 94 for constructing the closed magnetic circuit is made by mirror-finishing one side of a longitudinal rectangular ferrite block 98 cut out with predetermined dimensions, as shown in FIG. A pair of leg forming grooves 102, 102 parallel to each other in the longitudinal direction of the block 98 are formed on the mirror-finished surface of the block 98 along processing lines 100, 100 as shown in the figure. , 102 is cut into grooves 102, 10 along the cutting line 103 as shown in FIG.
It can be advantageously manufactured by cutting out a predetermined thickness in a direction perpendicular to 2.

As explained above, when manufacturing the FDD magnetic head of this embodiment, the block assembly 8 is
At the stage when a block assembly 86 having a thickness equivalent to that of the ferrite assembly 46 is cut out from the block assembly 86 from 2, the disc sliding surface of the block assembly 86 is simply subjected to a single disk polishing process. It is possible to specify the depth length of the magnetic gaps 61 and 67 for erasing, and therefore the number of depth polishing operations can be reduced compared to the conventional FDD magnetic head, which requires depth polishing to be performed at least twice. The manufacturing cost can be reduced by the amount of reduction.

In addition, in the depth polishing process to define the depth length of the magnetic gaps 61 and 67 for recording and reproducing and erasing, the depth length is defined by the tip edges of the track forming convex parts 66 and 68, as described above. Even in the case where the depth length is defined by the gap joining groove 74, the depth polishing process can be performed while actually measuring the depth length directly or indirectly. This has the advantage that the depth length of the magnetic gaps 61 and 67, especially the depth length of the magnetic gap 61 for recording and reproduction, can be set to predetermined dimensions with extremely high precision. Another feature is that conversion characteristics can be obtained extremely stably.

Furthermore, as is clear from the above description, the support member for supporting the ferrite bonded body 46 on the jimpal 106 can be a simple rectangular block (support block 104) that is inexpensive to manufacture. In addition to being advantageous in that the manufacturing cost of the magnetic head can be reduced, when joining the support member to the ferrite joint 46,
Since there is no need to perform difficult height adjustment, this also has the advantage of reducing the number of man-hours for manufacturing the magnetic head and reducing the manufacturing cost.

As is clear from the above description, by following the method of this embodiment as described above, it is possible to suitably manufacture the FDD magnetic head shown in FIG. 1 while having all the above-mentioned effects.

Although one embodiment of the present invention has been described in detail above,
This is a literal illustration, and it goes without saying that the present invention is not limited to these specific examples, and can be practiced with various changes, modifications, improvements, etc., without departing from the spirit thereof. By the way.

For example, in the embodiment described above, gap processing is performed to define the gap length of the recording/reproducing magnetic gap 61 and the gap length of the erasing magnetic gap 67, and the track shape of the recording/reproducing track section 48 and the erasing track section 50 are Track machining for defining the track shape (machining for forming the track forming convex portions 66 and 68) is performed on the first ferrite block 52 side, while the grooves of the gap joining grooves 74 are The inserting process is performed on the second and third ferrite blocks 5.
However, the gap machining, track machining, and grooving of the gap joining groove 74 are performed on the opposite side of the opposing ferrite blocks, or on both of them. Alternatively, gap machining can be done as follows.
By forming a non-magnetic film by sputtering etc.
Furthermore, the track processing may be performed by machining using a grindstone.

Furthermore, in the above embodiment, one of the two ferrite blocks constituting the ferrite core for recording and reproduction and one of the two ferrite blocks constituting the ferrite core for erasing are common to each other. However, if necessary, a recording/reproducing ferrite block and an erasing ferrite block may be prepared in place of the first ferrite block 52. It is also possible to configure the ferrite assembly in a state in which the data core and the data erase core are magnetically separated from each other.

Further, in the above embodiment, three ferrite members are joined in the same direction to form a ferrite bonded body, and a magnetic gap for recording and reproducing is provided at the abutting portion between each adjacent ferrite member. The present invention has been described as an example in which the present invention is applied to a magnetic head having a structure in which a track section for recording/reproducing is formed and a track section for erasing is provided with a magnetic gap for erasing. It is also possible to apply the present invention to a magnetic head having a structure in which a ferrite joined body is constructed of two ferrite members, and only a type of track portion having a predetermined magnetic gap is provided at the abutting portion between the two ferrite members. be.

In that case, two ferrite blocks may be prepared to obtain the ferrite bonded body, and the two ferrite blocks are subjected to gap processing, track processing, and the like as in the above embodiment.
Grooving of the gap joint grooves, etc. were carried out,
A ferrite bonded body will be produced according to the same procedure as in the previous example. Further, a U-shaped back core is preferably employed.

(Effects of the Invention) As is clear from the above explanation, if the magnetic head structure according to the present invention is adopted, the depth polishing process for defining the depth length of the magnetic gap can be done only once, and the ferrite bonded body can be Since a simple and inexpensive structure can be used as the supporting member made of non-magnetic ceramics, manufacturing costs can be reduced compared to magnetic heads with conventional structures, and the depth length of the magnetic gear can be defined. Since the depth length can be actually measured during depth polishing, the depth accuracy of the magnetic head can be greatly improved compared to magnetic heads with conventional structures, and the desired electromagnetic conversion characteristics can be stably obtained. This makes it possible. According to the first method of the present invention, in a device that employs a ferrite bonded body having a structure in which three ferrite members are butted together, the magnetic head according to the present invention can be advantageously used while covering all the above-mentioned effects. According to the second method of the present invention, in a product that employs a ferrite bonded body having a structure in which two ferrite materials are butted together, the above-mentioned effects can be covered, and The magnetic head according to the present invention can be manufactured advantageously.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a magnetic head for FDD according to the present invention. 2 to 14 are explanatory diagrams for explaining an example of the manufacturing process according to the method of the present invention for the magnetic head shown in FIG. 1, respectively, and FIG. FIG. 3 is a perspective view showing a first ferrite block prepared to obtain a first ferrite member of the joined body, and FIG. FIG. 4 is a perspective view showing a state in which a mask is applied to form gap length defining grooves by etching, and FIG. FIG.
FIG. 6 is a perspective view showing a second ferrite block (third ferrite block) prepared to obtain a second ferrite member (third ferrite member) of the ferrite bonded body in the magnetic head shown in FIG. 7 is a perspective view showing a state in which a groove for gap joining is formed in the ferrite block of FIG. 5, and FIG. FIG. 8 is a perspective view showing a ferrite block assembly produced by integrally joining second and third ferrite blocks in which
9 is a perspective view showing a ferrite block assembly cut out from the ferrite block assembly of FIG. 7 to approximately the same thickness as the ferrite block assembly; FIG.
Fig. 10 is a perspective view showing the ferrite block assembly in Fig. 8 after depth polishing and grooving for improving disk sliding characteristics; Fig. 10b is a diagram corresponding to the XX cross section in Fig. 9 in the case where the depth length of the magnetic gap is defined by the track forming groove; 11 is a perspective view showing the manufactured ferrite bonded body, and FIG. 12 is a perspective view showing the back core of the magnetic head in FIG. 1. ,
FIG. 13 is a perspective view showing a ferrite block prepared to obtain the back core shown in FIG. 12, and FIG. 14 shows a state in which leg forming grooves are formed in the ferrite block shown in FIG. 13. FIG. FIG. 15 is a perspective view showing an example of a conventional magnetic head for FDD, and FIGS. 16 to 19 are explanatory views for explaining the manufacturing process of the magnetic head shown in FIG. 15, respectively. 40: first ferrite member, 42: second ferrite member, 44: third ferrite member, 4
6: ferrite bonded body, 48: recording/reproducing track section, 50: erasing track section, 52: first ferrite block, 54: second ferrite block, 56: third ferrite block, 58,
70, 72: Abutment surface, 60, 64: Mask, 61: Magnetic gap for recording/reproduction, 67: Magnetic gap for erasing, 66, 68: Convex portion for track formation, 74: Groove for gap joining, 82, 86: Block Joined body, 94: Back core, 96, 97: Coil, 104: Support block (support member), 10
6: Gimbal, 108: FPC.

Claims (1)

[Scope of Claims] 1. At least two ferrite members are horizontally abutted and integrally joined, and a track portion having a magnetic gap with a predetermined magnetic gap length is provided at the butt portion between adjacent ferrite members. a flat plate-shaped ferrite bonded body; a ferrite back core that is fixed to a non-disc sliding side surface of the ferrite bonded body to form a closed magnetic path with the magnetic gap of the track portion as part of the magnetic path; 1. A magnetic head comprising: a support member made of a non-magnetic material that is fixed to a non-disk sliding side surface of the ferrite bonded body to support the ferrite bonded body. 2. After performing gap processing to define the magnetic gap length and track processing to define the track shape on at least one of the abutting surfaces of the first and second ferrite members,
The first ferrite member and the second ferrite member are integrally joined at their abutting surfaces, and a ferrite joint is provided with a track portion having a magnetic gap with a predetermined magnetic gap length at the abutting portion between the ferrite members. The disk sliding side of the ferrite bonded body is polished to define the depth length of the magnetic gap, while a separately fabricated ferrite back core is fixed to the non-disk sliding side of the ferrite bonded body. A closed magnetic path is formed in which the magnetic gap of the track portion is part of the magnetic path, and a support made of a non-magnetic material is provided on the non-disk sliding side surface of the ferrite bonded body to support the ferrite bonded body. A method for manufacturing a magnetic head characterized by fixing members. 3 In the first, second, and third ferrite members that are butted against each other in the same direction, at least one of the abutting surfaces of the first ferrite member and the second ferrite member, and the first ferrite member and the third ferrite member are At least one of the abutting surfaces with the ferrite member is subjected to a gap process to define the magnetic gap length and a track process to define the track shape, and then the first, second and second three ferrite members are integrally joined at their corresponding abutting surfaces to produce a ferrite joined body having track portions each having a magnetic gap with a predetermined magnetic gap length at the abutting portion between each adjacent ferrite member; While polishing the disk sliding side surface of the ferrite block assembly to define the depth length of the magnetic gap of each track portion, a separately manufactured ferrite back core is fixed to the non-disk sliding side surface of the ferrite block assembly. Thus, two closed magnetic paths are formed in which the magnetic gaps of each of the track parts are part of the respective magnetic paths, and a non-disk for supporting the ferrite bonded body is formed on the non-disk sliding side surface of the ferrite bonded body. A method for manufacturing a magnetic head, characterized by fixing a support member made of a magnetic material.