JP2005085370A - Magnetic head and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely set a track width, to prevent generation of defective products while maintaining high working efficiency, and to make gap losses small for recording and reproduction. <P>SOLUTION: A pair of core half bodies 5A, 5B made of magnetic bodies are used, in which the outside faces 5a are formed perpendicular to the track scanning direction X, and the inner side faces 5b are slanted at a predetermined azimuth angle θ; a magnetic head core 5 is formed by mutually splicing the inner side faces 5b of both core half bodies 5A, 5B faced to each other with a non-magnetic joining material 10 by sandwiching a magnetic gap G; a pair of notched grooves 8 are formed on both sides of the magnetic head core 5 from the outside faces 5a of one of the core half bodies 5A up to the middle of the front faces of the other core half body 5B passing through the magnetic gap G along the track scanning direction X; and thus, the track forming face T between both notched grooves 8 is left uncut along the track scanning direction X, and the bottom face 8a of each notched groove 8 is formed in a circularized shape. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a magnetic head attached to, for example, a cylinder head of a magnetic tape device and a method for manufacturing the same. In particular, the track width is set precisely so that processing efficiency is high and defective products do not occur.

Conventionally, as a magnetic head technology, there is one described in Patent Document 1 or the like, which includes FIG.
A recording / reproducing magnetic head 1a and a Hi-Fi magnetic head 1b provided in a four-head Hi-Fi type (4HD) cylinder head 2 shown in FIG. 4A, and a two-head type (2HD) shown in FIG. There are three types of magnetic heads 1 (1a to 1c) including a recording / reproducing magnetic head 1c provided in the cylinder head 2.

As shown in FIG. 5, the magnetic head core 5 forming each of the magnetic heads 1 (1a to 1c) has an outer surface 5a formed in a direction perpendicular to the track scanning direction X and an inner surface 5b formed at a predetermined azimuth angle θ. And a pair of core halves 5A and 5B made of a magnetic material inclined at a
A winding window 6 and a joining window 7 are formed on A and 5B, and the inner side surfaces 5b of both core halves 5A and 5B are brought into contact with each other with a magnetic gap G interposed therebetween. By forming a pair of notch grooves 8 on both inner side surfaces 5b with the magnetic gap G interposed between the front side edges, a track forming surface T having a predetermined track t width is formed between the notch grooves 8. For example, the filler 9 made of a non-magnetic material such as glass, ceramic, or synthetic resin is filled in each notch groove 8, and the bonding material 10 made of the same non-magnetic material is filled in the bonding window 7. Half body 5
A and 5B are joined with the magnetic gap G interposed therebetween, and both fillers 9 and both core halves 5A, 5 are joined together.
A magnetic tape sliding surface C is formed by subjecting the front surface of B to a curved surface. By moving a magnetic tape (not shown) relatively along the magnetic tape sliding surface C, the magnetic tape Record and play back

As shown on the right side of FIG. 6, the world color television broadcasting system using the magnetic heads 1 (1a to 1c) includes the NTSC system having a magnetic gap G width of about 0.4 ± 0.05 μm, and the magnetic There is a PAL system with a gap G width of about 0.47 ± 0.05 μm, and the magnetic head 1
(1a to 1c) are roughly divided into five types.

As shown on the left side of FIG. 6, the five types of magnetic heads 1 (1a to 1c) are divided into 10 types (A to J) according to the difference in the track t width, and the 10 types of magnetic heads 1 ( 1a
˜1c) (C, F, G, H, I, J) are divided into two types (R, L) according to the left and right direction of the azimuth angle. (1a-1c) is 1
There are 6 types. LP indicates one speed and SP indicates two speed.

The method of manufacturing each magnetic head 1 will be described. In the first step, as shown in FIG.
For example, a pair of core bar halves 5Aa and 5Bb made of a magnetic material such as a high permeability ferrite, a sendust alloy, or a laminated body of amorphous magnetic alloy bands, and a groove 6a for the winding window 6 and a groove 7 for the bonding window 7 are provided.
By recessing a, five types of core bar halves 5Aa and 5Bb with a pair of concave grooves 6a and 7a are formed in accordance with the five types of magnetic heads 1 (1a to 1c) shown on the right side of FIG.

In the second step, as shown in FIG. 7 (b), the core bar half body 5A with five types of concave grooves 6a and 7a is provided.
A plurality of notch grooves 8 are formed on the edges of a and 5Bb in accordance with the track t width to form 10 types of core bar halves 5Aa and 5Bb with a pair of notch grooves 8 (A to J in FIG. 6). After that, the inner surface 5b facing each other of the core bar halves 5Aa and 5Bb with the notch grooves 8 is mirror-finished.

In the third step, as shown in FIG. 7C, a pair of core bar halves 5Aa,
At least one of the inner side surfaces 5b of 5Bb is coated with a nonmagnetic material such as silicon dioxide, glass or ceramic by physical vapor deposition to form a magnetic gap G.

In the fourth step, as shown in FIG. 8A, both core bar halves 5 with the magnetic gap G interposed therebetween.
Aa and 5Bb are brought into contact with each other and the notch grooves 8 facing each other are precisely combined with each other, and the combined notch groove 8 is filled with a filler 9 made of a nonmagnetic material such as glass, ceramic, or synthetic resin. At the same time, the core window halves 5Aa and 5Bb are joined to each other by filling the joint window 7 with the joint material 10 made of the same non-magnetic material to form ten kinds of core bars 5C. The front side b and the rear b on the 8th side are mirror-polished to inspect whether the notch grooves 8 are precisely united. If the result of the inspection is that they are not united precisely, they will be rejected as defective products. For the core bar 5C that is precisely combined, FIG.
As shown in FIG. 3, the magnetic tape sliding surface C is formed by subjecting the front surface i on the notch groove 8 side to a curved surface with a predetermined curvature radius R.

In the fifth step, as shown in FIG. 8C, by slicing the core bar 5C along a virtual line S1 crossing the center of each notch groove 8 at a predetermined azimuth angle with respect to each magnetic gap G. As shown in FIG. 6D, 16 types of magnetic head cores 5 are formed (see the left side of FIG. 6).
JP-A-55-12525

In the above-described conventional configuration, both core bar halves 5Aa, 5 are formed at an early stage (second process) of the manufacturing process.
By forming a plurality of cutout grooves 8 on the edge of Bb [see FIG. 7B], the track t
Since the width is determined, many (10 types) core bar halves 5Aa and 5Bb are used in this process.
Must be formed (see A to J in FIG. 6). Therefore, in the subsequent steps, the various types of core bar halves 5Aa and 5Bb must be processed separately, which takes time and effort, lowers the processing efficiency, and increases costs. .

Further, in the fourth step, when the two core bar halves 5Aa and 5Bb are brought into contact with each other, when the notch grooves 8 facing each other are merged (see FIG. 8A), the notch grooves 8 are connected to each other. In this case, the track forming surfaces T facing each other with the magnetic gap G interposed therebetween are not precisely aligned, resulting in a defective product.

Further, after the core bar halves 5Aa and 5Bb are joined to form the core bar 5C, the core bar 5C is mirror-polished (see (a) and (b) in FIG. 8 (a)) so that the notch grooves 8 are precisely combined. It is necessary to inspect whether or not the mirror has been polished, and it takes time and effort to perform the mirror polishing and inspection.

As a technique for solving the above problems, there is one described in Japanese Patent Laid-Open No. 6-338013. As shown in FIG. 9, a pair of core halves 5A and 5B made of a magnetic material having both inner and outer side surfaces 5a and 5b inclined at a predetermined azimuth angle θ are used. The magnetic head core 5 is formed by bonding the mutually facing inner side surfaces 5b with a nonmagnetic bonding material 10 with the magnetic gap G interposed therebetween, and the outer side surface of one core half body 5A is formed on both side edges of the magnetic head core 5. A pair of cutout grooves 8 that pass through the magnetic gap G from 5a and reach the center of the front surface of the other core half 5B are formed at a predetermined angle δ with respect to the track scanning direction X. A track forming surface T having a predetermined length h that is inclined by a predetermined angle δ with respect to the track scanning direction X is left uncut, and the notch grooves 8 are filled with a filler 9 made of a nonmagnetic bonding material. Filler 9 and both core halves 5A, the magnetic tape sliding surface C is subjected to curved surface machining is formed on the front surface of 5B.

According to the above configuration, a pseudo gap is not generated at the edge Ta of the track forming surface T.
Since the track forming surface T is inclined by a predetermined angle δ and the track forming surface T is not along the track scanning direction X, it is not suitable for precisely setting the track t width in response to a request for higher recording density. It is. In addition, both fillers 9 extend to the outer surface 5a of one core half 5A,
The front surfaces of the both fillers 9 are formed flush with the front surface of the track forming surface T, and due to the difference in thermal expansion coefficient between them, both fillers 9 adhere to the magnetic tape and the track forming surface T. The recording and playback clearance loss may increase. Further, since the width of the track forming surface T is extremely narrow, there is a possibility that the track forming surface T is damaged and becomes a defective product due to an impact when the both notched grooves 8 are scraped with a blade.

SUMMARY OF THE INVENTION The present invention provides a magnetic head and a manufacturing method thereof in which the track width is precisely set, the processing efficiency is high, defective products are not generated, and the gap loss in recording and reproduction is reduced in view of the above-described conventional drawbacks. The purpose is that.

In order to achieve the above object, the invention according to claim 1 is a pair of core halves made of a magnetic material having an outer surface formed in a direction perpendicular to the track scanning direction and an inner surface inclined at a predetermined azimuth angle. A magnetic head core is formed by joining the mutually facing inner side surfaces of the core halves with a nonmagnetic bonding material with a magnetic gap interposed therebetween, and one core half is formed on both side edges of the magnetic head core. By forming a pair of notch grooves that pass through the magnetic gap from the outer surface of the core and reach the center of the front surface of the other core half body at a predetermined angle with respect to the track scanning direction, track scanning is performed between the notch grooves. The track forming surface inclined by a predetermined angle is left uncut, and each notch groove is filled with a filler made of a non-magnetic bonding material, and curved surfaces are applied to the front surfaces of both the filler and both core halves. In the magnetic head in which a magnetic tape sliding surface is formed and the magnetic tape is moved relatively along the magnetic tape sliding surface to perform recording and reproduction on the magnetic tape, Instead of the track forming surface being left by being inclined at a predetermined angle with respect to the track scanning direction, both notched grooves are formed along the track scanning direction, so that the track forming surface between the notched grooves is tracked. The notch groove is left uncut along the scanning direction, the bottom surface of each notch groove is formed in an arc shape, and the notch is not filled in the notch grooves.

The invention according to claim 2 uses a pair of core halves made of a magnetic body having an outer surface formed in a direction perpendicular to the track scanning direction and an inner surface inclined at a predetermined azimuth angle. A magnetic head core is formed by joining the inner side surfaces facing each other with a non-magnetic bonding material across a magnetic gap, and a magnetic gap is formed on both side edges of the magnetic head core from the outer side surface of one core half. By forming a pair of notch grooves that pass through and reach the front center of the other core half along the track scanning direction, the track forming surface between the notch grooves is left uncut along the track scanning direction. It is characterized by being.

According to a third aspect of the present invention, in the second aspect of the present invention, the bottom surface of each notch groove is formed in an arc shape.

In the first aspect of the present invention, the plurality of magnetic plates are provided with a plurality of grooves for winding windows and a plurality of grooves for bonding windows at predetermined intervals in the plurality of magnetic plates, and in the second step, After the mirror plates are processed on the inner surfaces facing each other of the magnetic plates, the inner surfaces of the magnetic plates are brought into contact with each other with a magnetic gap interposed therebetween, and bonding processing with a nonmagnetic bonding material is performed on the concave grooves. The magnetic plates are joined together to form a magnetic laminate, and in the third step, the portion facing the bottom surface of each junction window groove in the magnetic laminate is perpendicular to the magnetic gap formation direction. A plurality of core plates are formed by slicing along the direction, and in the fourth step, each core plate is substantially parallel to the magnetic gap at predetermined intervals with the groove for winding window and the groove for bonding window interposed therebetween. And slicing to form a core bar, Of the pair of core bar halves that form the core bar with a disk-shaped blade having a cross-sectional arcuate blade in five steps, the other core bar halves pass through the magnetic gap from the outer surface of one of the core bar halves. By forming a plurality of notch grooves reaching the center of the front surface in parallel along the track scanning direction, the track forming surfaces between the notch grooves are left uncut along the track scanning direction, and the front surfaces of both core bar halves A pair of core halves joined by sandwiching the magnetic gap by slicing the core bar so as to vertically cut the center of each notch groove in the sixth step. The magnetic head core is formed by cutting the outer side surfaces of both core halves along a virtual line perpendicular to the track scanning direction.

The invention according to claim 1 corresponds to an embodiment (see FIG. 1). According to this, a track forming surface that is relatively long and parallel to the track scanning direction is formed between both notch grooves. Since it is left uncut, it is suitable for precisely setting the track width in response to a request for higher recording density. In addition, since the filler is not filled in both the notched grooves, the filler does not impair the adhesion between the magnetic tape and the track forming surface as in the past, and the gap loss in recording and reproduction is reduced. Can do. Furthermore, since the base of the track forming surface is thickened by forming the bottom surface of each notch groove in an arc shape, the track forming surface is not damaged by the impact when scraping off both notch grooves with a blade. In this way, defective products can be prevented from occurring. Furthermore, since the outer surfaces of both core halves are not parallel to the magnetic gap, a pseudo gap does not occur at the outer surface and the edge of the track forming surface.
Since the edge of each notch groove is formed in an arc shape, a pseudo gap is not generated at the edge of each notch groove.

According to the second aspect of the present invention, since the track forming surface which is relatively long and parallel to the track scanning direction is left uncut between both the notched grooves, the track width is set in response to a request for increasing the recording density. Suitable for precise setting. In addition, since the filler is not filled in both the notched grooves, the filler does not impair the adhesion between the magnetic tape and the track forming surface as in the past, and the gap loss in recording and reproduction is reduced. Can do. Further, since the outer surfaces of both core halves are not parallel to the magnetic gap, a pseudo gap is not generated at the outer surface and the edge of the track forming surface.

According to invention of Claim 3, by forming the bottom face of each notch groove in circular arc shape,
Since the base of the track forming surface is thick, it is possible to prevent the track forming surface from being damaged by the impact when the notch grooves are scraped off with a blade, so that a defective product does not occur.
Further, since the edge of each notch groove is formed in an arc shape, a pseudo gap is not generated at the edge of each notch groove.

According to the invention described in claim 4, in a late stage (fifth process) of the manufacturing process, of the pair of core bar halves forming the core bar, the magnetic gap passes through the outer surface of one of the core bar halves. A plurality of cutout grooves reaching the center of the front surface of the other half of the core bar are formed in parallel along the track scanning direction, and the classification is delayed until this stage. Compared with the case where the notch grooves are formed, the processing does not take time and effort, the processing efficiency is high, and the cost can be reduced.

In addition, since notched grooves are formed on both core bar halves joined across the magnetic gap, the tracks facing each other across the magnetic gap of both core bar halves are precisely aligned, It is possible to eliminate the occurrence of defective products due to the positional shift of the notch grooves as in the prior art.

Moreover, since the mirror finish for confirming the track width is not required, the cost can be reduced by the amount that is unnecessary.

Furthermore, a magnetic head core is formed from a magnetic laminate through a large number of core bars, and the magnetic head can be mass-produced at a lower cost than when a magnetic head core is formed from a conventional core bar.

FIG. 1 shows a magnetic head core 5 of a magnetic head 1 (1a to 1c) according to an embodiment of the present invention. An outer surface 5a is formed in a direction perpendicular to the track scanning direction X, and an inner surface 5 is formed.
A pair of core halves 5A and 5B made of a magnetic material in which b is inclined at a predetermined azimuth angle θ are used, and the inner side surfaces 5b of the core halves 5A and 5B facing each other are sandwiched by a magnetic gap G. The magnetic head core 5 is formed by bonding with the nonmagnetic bonding material 10, and the other core half 5 </ b> B passes through the magnetic gap G from the outer surface 5 a of one core half 5 </ b> A at both side edges of the magnetic head core 5. By forming a pair of notch grooves 8 reaching the center of the front surface of the track along the track scanning direction X, a track forming surface T between the notch grooves 8 is left uncut along the track scanning direction X. The bottom surface 8a of the notch groove 8 is formed in an arc shape, and each notch groove 8
The filler 9 (see FIG. 9) is not filled therein. Since the configuration other than the above is substantially the same as the configuration shown in FIGS. 4 to 9, the same reference numerals are given to the same portions and the description thereof is omitted.

According to the above configuration, since the track forming surface T that is relatively long h and parallel to the track scanning direction X is left between the notched grooves 8, the track t width is set in response to a request for higher recording density. Suitable for precise setting. Further, since the filling material 9 (see FIG. 9) is not filled in the notch grooves 8, the filling material 9 does not impair the adhesiveness between the magnetic tape and the track forming surface T as in the prior art, and recording is performed. In addition, it is possible to reduce the gap loss in regeneration.
Furthermore, the track forming surface T is formed by forming the bottom surface 8a of each notch groove 8 in an arc shape.
Since the root of the blade is thick [see FIG. 1 (d)], the notch groove 8 is formed in the blade B [FIG.
It is possible to prevent the track forming surface T from being damaged by the impact at the time of scraping in a), so that a defective product is not generated. Furthermore, since the outer surfaces 5a of the core halves 5A and 5B are not parallel to the magnetic gap G, no pseudo gap is generated at the outer surface 5a and the edge Ta of the track forming surface T. In addition, since the edge 8b of each notch groove 8 is formed in an arc shape [see FIG. 1 (b)], a pseudo gap is also generated at the edge 8b of each notch groove 8. There is no.

The manufacturing method of the magnetic head 1 (1a to 1c) will be described. In the first step, as shown in FIG. 2 (a), for example, a high permeability ferrite, a sendust alloy, or a laminated body of amorphous magnetic alloy bands is used. A plurality of magnetic plates 5D made of a magnetic material are provided with a groove 6a for the winding window 6 and a groove 7a for the bonding window 7.
Are recessed in parallel with a predetermined interval, by NTSC system and PAL system,
Magnetics with a plurality of concave grooves 6a and 7a according to five types of magnetic heads 1 (1a to 1c) of 4 heads Hi-Fi type (4HD), 2 heads type (2HD) and Hi-Fi (see FIG. 6). Five types of plates 5D are formed.

In the second step, as shown in FIG. 2 (b), the mirror plate is applied to the mutually opposing inner surfaces of the magnetic plate 5D with a plurality of concave grooves 6a and 7a and the thin magnetic plate 5D shown at the right end in the figure. The inner surfaces of the magnetic plates 5D are brought into contact with each other with a magnetic gap G made of a non-magnetic material such as silicon dioxide, glass, or ceramic interposed therebetween, and the grooves 6a and 7a are made of glass, ceramic, The magnetic laminate 5E is formed by bonding the magnetic plates 5D to each other by bonding with a nonmagnetic bonding material 10 such as a synthetic resin.

In the third step, as shown in FIG. 2B, a virtual line S <b> 2 in a direction orthogonal to the direction in which the magnetic gap G is formed at a location facing the bottom surface of the groove 7 a for each joint window 7 of the magnetic laminate 5 </ b> E. And a plurality of core plates 5F are formed (see FIG. 2C).

In the fourth step, as shown in FIG. 2 (c), each core plate 5F has a groove 6a for the winding window 6 and a groove 7a for the bonding window 7 sandwiched therebetween, and the magnetic gap G is almost equal to the predetermined interval. Parallel virtual line S
The core bar 5C is formed by slicing along 3 (see FIG. 3A).

In the fifth step, as shown in FIG. 3A, one of the pair of core bar halves 5Aa and 5Bb that forms the core bar 5C by the disk-like blade B having the cross-sectional arcuate blade portion Ba. A plurality of cutout grooves 8 that pass through the magnetic gap G from the outer surface of the half body 5Aa and reach the center of the front surface of the other core bar half body 5Bb are formed in parallel along the track scanning direction X. Leaving the track forming surface T between the grooves 8 along the track scanning direction X;
The magnetic tape sliding surface C is formed by subjecting the front surfaces of both core bar halves 5Aa and 5Bb to curved surface processing with a predetermined radius of curvature R.

In the sixth step, as shown in FIG. 3B, the core bar 5C is sliced so that the center of each notch groove 8 is vertically cut along the phantom line S4. The core halves 5A and 5B are formed, and the edge Ta of the track forming surface T is curved with a predetermined radius of curvature r. As shown in FIG. Outside surface 5a
Is cut along a virtual line S5 perpendicular to the track scanning direction X to form the magnetic head core 5 (see FIG. 1).

According to the above configuration, the core bar 5 is formed at a late stage (fifth process) of the manufacturing process shown in FIG.
Of the pair of core bar halves 5Aa and 5Bb forming C, one of the core bar halves 5Aa
A plurality of cutout grooves 8 that pass through the magnetic gap G from the outer surface of the other core bar and reach the center of the front surface of the other half of the core bar 5Bb are formed in parallel along the track scanning direction X. Since the type classification is delayed, compared with the conventional method of forming the notch groove 8 at an early stage, the process does not take time and effort, and the machining efficiency is high and the cost is high. You can go down.

Further, since the cutout grooves 8 are formed in the core bar halves 5Aa and 5Bb joined with the magnetic gap G interposed therebetween, the magnetic gap G between the core bar halves 5Aa and 5Bb is opposed to each other. The track t to be precisely aligned is a notch groove 8 as in the prior art.
It is possible to eliminate the occurrence of defective products due to misalignment.

In addition, since the mirror finish for confirming the track t width is not required, the cost can be reduced by the amount that is unnecessary.

Furthermore, the magnetic head core 5 is formed from the magnetic laminate 5E through a large number of core bars 5C. Compared to the case of forming the magnetic head core 5 from the conventional core bar 5C,
The magnetic head 1 (1a to 1c) can be mass-produced at low cost.

In the above embodiment, five types of magnetic plates 5D are formed in the first step. However, the present invention is not limited to this, and the NTSC magnetic gap G width (0.4 ± 0.05 μ) and PAL are not limited thereto.
Since the magnetic gap G width (0.47 ± 0.05 μ) of the method is almost the same, by combining both of them with the NTSC method, three types of magnetic plates 5D are formed in the first step. Also good. As a result, the number of processes can be reduced as much as the combined use.
Cost reduction can be further promoted.

(A) is a perspective view showing a magnetic head core of a magnetic head according to an embodiment of the present invention, (b) is a plan view thereof, (c) is a front view thereof, and (d) is a side view thereof. (A)-(c) is a perspective view which shows the first half of the manufacturing process of a magnetic head core. (A)-(c) is a perspective view which shows the second half of the manufacturing process of a magnetic head core. (A) And (b) is a schematic plan view which shows a cylinder head. (A) is a perspective view which shows a prior art example, (b) is the top view, (c) is the front view, (d) is a side view. It is explanatory drawing which shows the classification classification table of a magnetic head. (A)-(c) is a perspective view which shows the first half of the manufacturing process of a magnetic head core. (A)-(d) is a perspective view which shows the second half of the manufacturing process of a magnetic head core. (A) is a perspective view which shows the other example of the past, (b) is the top view, (c) is the front view, (d) is a side view.

Explanation of symbols

1 (1a-1c) Magnetic head 5 Magnetic head core 5A, 5B Core half body 5Aa, 5Bb Core bar half body 5C Core bar 5D Magnetic plate 5E Magnetic laminated body 5F Core plate 5a Outer side surface of core half body 5b Inner side surface of core half body 6 Winding window 6a Winding window groove 7 Bonding window 7a Bonding window groove 8 Notch groove 8a Bottom surface of notch 9 Filler 10 Bonding material θ Azimuth angle G Magnetic gap T Track forming surface C Magnetic tape sliding Surface t Track X Track scanning direction B Blade

Claims (4)

A pair of core halves made of a magnetic material whose outer side surface is formed in a direction perpendicular to the track scanning direction and whose inner side surface is inclined at a predetermined azimuth angle are used. Are bonded with a non-magnetic bonding material with a magnetic gap interposed therebetween, and a magnetic head core is formed on both side edges of the magnetic head core through the magnetic gap from the outer surface of one core half. By forming a pair of notch grooves that reach the center of the front surface at a predetermined angle with respect to the track scanning direction, a track forming surface that is inclined at a predetermined angle with respect to the track scanning direction is left uncut between the two notch grooves. Each notch groove is filled with a filler made of a nonmagnetic bonding material, and the front surfaces of both the filler and the core halves are curved to form a magnetic tape sliding surface. In a magnetic head in which recording and reproduction are performed on the magnetic tape by relatively running the magnetic tape along the sliding surface, the track forming surface is inclined at a predetermined angle with respect to the track scanning direction. Instead of being left uncut, by forming both notched grooves along the track scanning direction, the track forming surface between both notched grooves is left uncut along the track scanning direction, and each notched groove The magnetic head is characterized in that the bottom surface of the magnetic head is formed in an arc shape, and the filler is not filled in the notched grooves. A pair of core halves made of a magnetic material whose outer side surface is formed in a direction perpendicular to the track scanning direction and whose inner side surface is inclined at a predetermined azimuth angle are used. Are bonded with a non-magnetic bonding material with a magnetic gap interposed therebetween, and a magnetic head core is formed on both side edges of the magnetic head core through the magnetic gap from the outer surface of one core half. A magnetic head, wherein a pair of notch grooves reaching the center of the front surface is formed along a track scanning direction, whereby a track forming surface between both the notch grooves is left uncut along the track scanning direction. 3. The magnetic head according to claim 2, wherein the bottom surface of each notch groove is formed in an arc shape. In the first step, a plurality of grooves for winding window and a groove for bonding window are recessed in parallel to each other at a predetermined interval on a plurality of magnetic plates, and in the second step, the inner surfaces of the magnetic plates facing each other are arranged. After mirror processing on the side surfaces, the inner surfaces of the magnetic plates are brought into contact with each other with a magnetic gap in between, and the magnetic grooves are bonded by bonding the non-magnetic bonding material to the concave grooves. In the third step, a portion facing the bottom surface of each groove for connecting windows of the magnetic laminate is sliced along a direction perpendicular to the magnetic gap formation direction in the third step, and a plurality of the magnetic laminates are formed. A core plate is formed, and in the fourth step, core bars are formed by slicing each core plate approximately parallel to the magnetic gap at predetermined intervals with the groove for winding window and the groove for bonding window interposed therebetween. In the fifth step, the cross-sectional arc shape Among a pair of core bar halves forming a core bar by a disk-shaped blade having a portion, a plurality of notches that pass through the magnetic gap from the outer surface of one core bar half and reach the front center of the other core bar half By forming the grooves in parallel along the track scanning direction, the track forming surface between the cutout grooves is left uncut along the track scanning direction, and the front surfaces of both core bar halves are subjected to curved surface processing to form a magnetic tape slide. Forming a moving surface, and in a sixth step, forming a pair of core halves joined by sandwiching a magnetic gap by slicing the core bar so as to longitudinally cut the center of each notch groove; A magnetic head core is formed by cutting the outer surface of the magnetic head along a virtual line perpendicular to the track scanning direction.

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