JPH0612616A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To assure the stable traveling performance of a tape by forming projections of core base bodies of a tape-sliding surface into a shape nearly symmetrical with the center line of the sliding width in parallel with the traveling direction of the tape. CONSTITUTION:The tape-sliding surface is formed into a shape which is approximately symmetrical with the center line D-D' and in only the magnetic gap 4 inclined by an azimuth angle theta. The contact state with the magnetic tape is the same in the respective core half bodies 1A, 1B with the gap 4 part as the center and the stable tape contact state is obtd. even if wear difference arises in the core base bodies 1, magnetic metallic films 3 and nonmagnetic materials 5 at the time of the tape traveling. The stable tape contact state is thus obtd. and the magnetic head which is less deteriorated in characteristic by the tape traveling is obtd. The gap 4 simply inclines by the azimuth angle and the change in the symmetry of the projections 2a of the core base bodies 2 is averted even if the angle theta is increased and, therefore, the stable traveling characteristic of the tape is obtainable even in the magnetic head having a high azimuth angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head and a manufacturing method thereof, and more particularly to a VTR using a high coercive force recording medium.
The present invention relates to a magnetic head suitable for use in (video tape recorder) and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art For high density magnetic recording, high coercive force (Hc)
Although a metal tape or the like having is used, the magnetic head is also replaced with the conventional ferrite material to cope with this.
Various head structures using a metal magnetic film having a high saturation magnetic flux density, such as an Fe-Al-Si alloy (Sendust alloy) or a Co-Nb-Zr type amorphous alloy, as a main magnetic core have been proposed and put to practical use. Has been done. Further, it is also a more important issue for this type of magnetic head to prevent the occurrence of spacing loss with the shortening of the recording wavelength in recent years.

A magnetic head using such a metal magnetic film as a main magnetic core and having a structure capable of suppressing the occurrence of a step due to uneven wear in the magnetic gap portion is disclosed in Japanese Patent Laid-Open No.
The magnetic head described in Japanese Patent No. 241709 is cited.

FIG. 7 is a front view seen from the tape sliding surface of the magnetic head disclosed in the above-mentioned prior application. In the figure,
51A and 51B are paired core halves, and each core half 51
A and 51B are core bases 5 made of ferrite, respectively.
2 and a metal magnetic film (ferromagnetic metal thin film) 53 deposited / formed on the abutting surface side of the core substrate 52. On the butt surface side of the core base 52, a projection 52a having a substantially mountain shape (in the example of FIG. 7, a substantially mountain shape obtained by cutting the apex of the acute angle mountain shape) is formed by machining, and the protrusion 52a is formed. The metal magnetic film 5 is formed on the formation surface side.
3 is formed into a predetermined film thickness by the vacuum thin film forming technique. Further, the metal magnetic film 53 is formed on the top of the protrusion 52a.
Has a flat portion that defines the track width Tw. Then, the flat portions of the metal magnetic film 53 are butted against each other via a gap regulating film (non-magnetic thin film) not shown.
The magnetic halves 54 are joined together to form the magnetic gaps 54, and the core halves 51A, 51 are made of non-magnetic material 55 such as low melting point glass.
It has a structure in which B and B are joined and integrated.

By adopting such a structure, since the ferromagnetic metal magnetic film 53 is formed in the magnetic gap 54, recording / reproducing can be sufficiently performed on a high coercive force recording medium such as a metal tape. It is possible to obtain a magnetic head having excellent characteristics that can be applied to high density recording. further,
In the processing of the protrusion 52a, as shown in FIG. 7, on the tape sliding surface, the angles θ ₅ and θ ₆ formed by the protrusion tangential direction at both ends of the flat portion of the protrusion 52a and the normal direction of the magnetic gap abutting surface are set. , In relation to the azimuth angle θ, θ =
Since it is set to (θ ₅ + θ ₆ ) / 2, the non-magnetic material 55 does not come into sliding contact with the recording track portion during tape running, and the non-magnetic material 55 and the metal magnetic film 53 have wear resistance. The uneven wear step due to the characteristic difference does not occur. This is devised so that a magnetic head having excellent tape running characteristics can be obtained.

[0006]

However, when the tape is running, not only the uneven wear step of the magnetic gap 54 portion but also the contact state of the tape contact surface (the magnetic recording medium facing surface) around the magnetic gap 54 and the magnetic tape. The sliding characteristics are greatly affected, and the core substrate 52, the metal magnetic film 53, the non-magnetic material 5
The shape of 5 becomes an important factor. Here, in the above-mentioned conventional technique, as shown in FIG.
Angle formed by two tangent lines at both ends of the flat portion of, ie, the angle formed by the inclined surfaces on both sides of the protrusion 52a (θ ₅ + θ ₆ )
The line A-A 'that bisects the
It will only be inclined. Therefore, as shown in the figure, with respect to the sliding width center line BB ′ that bisects the sliding width L of the tape contact surface of the magnetic head, the core base 52 and the metal magnetic film 5 are formed.
3. The shape of the non-magnetic material 55 is asymmetric. As a result, during tape running, the shape of the sliding surface in the sliding width direction varies depending on the location due to the difference in wear resistance of each member on these sliding surfaces.

FIG. 8 is a diagram showing a state of interference fringes obtained by measuring the shape of the magnetic head of FIG. 7 in the vicinity of the magnetic gap after the tape is slid by a multiple interference method. As shown in the figure, the major axis C of the elliptical interference fringes near the magnetic gap 54 is shown.
-C 'is inclined with respect to the tape running direction as compared with other portions. During tape sliding, the tape contact surface of the magnetic head is worn by the magnetic tape, and the wear shape of the tape contact surface is determined by the contact state of the magnetic tape. Therefore, as shown in FIG. 8, in the sliding surface shape of the prior art, the tape contact between the vicinity of the magnetic gap 54 and other portions is different due to the difference in wear resistance of the sliding surface constituent materials, and good tape contact is achieved. However, there is a problem that this tendency is increased especially in a magnetic head having a high azimuth angle.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a magnetic head capable of obtaining stable tape running characteristics even if it has a high azimuth angle.

[0009]

In order to achieve the above-mentioned object, the present invention has a core substrate having a substantially mountain-shaped protrusion on the abutting surface side, and a metal magnetic film formed on the abutting surface side of the core substrate. A pair of core halves, and a coil wound around a winding window provided on at least one of the pair of core halves. The metal magnetic films, which are flat portions defining the track width in the vicinity of the tops of the protrusions, are abutted through a gap regulating film (non-magnetic film) so that they are aligned with each other, and a magnetic gap is formed by the gap regulating film. In a magnetic head in which the magnetic gap has an inclination of a predetermined azimuth angle, the angles formed by both inclined surfaces of the protrusions of each core substrate on the magnetic recording medium facing surface are substantially equal, and the angle is divided into two equal parts. Line , Together with the parallel tape running direction substantially, so that the center line substantially the same position of the tape sliding width direction, and. As a result, the shapes of the core substrate, the metal magnetic film, and the non-magnetic material in the sliding width direction on the tape sliding surface (the surface facing the magnetic recording medium) are substantially symmetrical with respect to the sliding width center line parallel to the tape running direction. Becomes In other words, in the head manufacturing process, the shapes of the protrusions are θ ₁ and θ ₂ which are angles formed by the inclined surfaces of the protrusions and the normals of the abutting surfaces, respectively.
When the azimuth angle is θ, θ = (θ ₁ −θ ₂ ) / 2,
It is sufficient to set θ ₁ > θ ₂ .

[0010]

Since the shape of the projection of the core base on the tape sliding surface is almost symmetrical with respect to the center line of the sliding width parallel to the tape running direction, the sliding width of the metal magnetic film and the non-magnetic material is increased along with the core base. The shape is symmetrical with respect to the center line. As a result, even if there is a difference in wear between the core substrate, the metal magnetic film, and the non-magnetic material, the shape in the sliding width direction with respect to the tape running direction becomes symmetrical about the magnetic gap portion, and the tape running performance is more stable than before. A magnetic head having is obtained.

[0011]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a front view seen from the tape sliding surface of the magnetic head according to the first embodiment of the present invention. In this embodiment, the azimuth angle θ is set to 15 degrees. In FIG. 1, 1A and 1B are paired core halves, 2 is a core substrate, 2
a is a protrusion of the core substrate 2, 3 is a metal magnetic film (ferromagnetic metal thin film), 4 is a magnetic gap (operating gap), and 5 is a non-magnetic material. Each of the core halves 1A and 1B includes a core substrate 2 made of a ferrite material and a metal magnetic film 3 deposited / formed on the abutting surface side of the core substrate 2, and the abutting of the core substrates 2 is performed. On the surface side, a projection 2a having a substantially mountain shape is formed by machining. In addition, the substantially chevron shape referred to in the present invention refers to a projection that tapers gradually toward the tip, and in the example of FIG. The shape is also included in this. A metal magnetic film 3 is formed on the surface on which the protrusion 2a is formed to have a predetermined film thickness by a vacuum thin film forming technique.
At the top of the protrusion 2a, the metal magnetic film 3 has a track width T
It has a flat portion that defines w (strictly speaking, the track width Tw is determined by the actual length of the flat portion and the azimuth angle). Then, the flat portions of the metal magnetic film 3 are butted and joined together via a gap regulating film (non-magnetic thin film) (not shown) to form the magnetic gap 4.
With the non-magnetic material 5, the core halves 1A and 1B are joined and integrated. Although not shown, a winding window is formed on one of the core halves 1A and 1B,
The coil is wound using this winding window.

Further, the angles formed by both inclined surfaces of the protrusions 2a of each core substrate 2 (the angle formed by the metal magnetic films 3 on both inclined surfaces of the protrusions 2a) θ ₃ and θ ₄ are equal, and this angle θ ₃ ,
The bisecting line (not shown) of θ ₄ is configured to be substantially at the same position as the sliding width center line DD ′ of the tape sliding width L. That is, the shape of the tape sliding surface is substantially line-symmetric with respect to the tape sliding width center line DD ′, and the magnetic gap 4
Only the shape is inclined by the azimuth angle θ. By adopting such a tape sliding surface shape, even if there is a difference in wear between the core substrate 1, the metal magnetic film 3, and the non-magnetic material 5 when the tape is running, the contact state with the magnetic tape is 4 magnetic gaps. The core half bodies 1A and 1B have the same center, and a more stable tape contact state than before is obtained.
It is possible to realize a magnetic head with less characteristic deterioration due to tape running. Further, with the sliding surface shape of the present invention, even if the azimuth angle θ is increased, the magnetic gap 4 only tilts by the azimuth angle, and the symmetry of the projections 2a of the core substrate 2 can be kept unchanged. Also, stable tape running characteristics can be obtained even with a magnetic head having a high azimuth angle.

In this embodiment, the metal magnetic film 3 is made of a crystalline soft magnetic material such as Fe-Al-Si alloy or an amorphous soft magnetic material such as Co-Nb-Zr alloy. Further, the non-magnetic material 5 uses a low-melting point glass whose filling temperature can be lowered in order to reduce the influence on the metal magnetic film 3, and a gap regulating film (non-magnetic thin film) for forming the magnetic gap 4. ) Uses, for example, a SiO ₂ film or the like so that a predetermined gap length can be obtained.

Next, a method of manufacturing the magnetic head shown in FIG. 1 will be described in detail with reference to FIG. Figure 2 (a)
Shows a process for forming the projection 2a on a base material block (ferrite substrate in this example) 10 which is a base material of the core substrate 2. That is, first, the base material block 1
Depth is 100 to 300 μm on the side that becomes the 0 butt surface.
A plurality of grooves 11 having a substantially V-shaped cross section are formed in parallel by mechanical cutting using a dicing saw or the like, thereby forming a plurality of protrusions 2a in parallel. At this time, the winding window groove 12 is also formed by a dicing saw or the like so as to be orthogonal to the groove 11. As a ferrite substrate material to be the base material block 10, Mn-Zn single crystal, Mn
-Zn polycrystal or a ferrite material obtained by joining these may be used.

The sectional shape of the protrusion 2a at this time is, as shown in the lower side of FIG. 2A, a perpendicular line (normal line) EE 'from a plane parallel to the magnetic gap surface and the protrusion 2a. The angles formed by the two inclined surfaces 2a- ₁ and 2a-2 are θ ₁ and θ _{2 respectively.}
And the azimuth angle θ of the magnetic gap 4 is θ = (θ ₁ −θ ₂ ) / 2, θ ₁ > θ ₂ , (θ ₁ + θ ₂ ) /
It is set so as to satisfy each relation of 2> θ. Specifically, the setting is performed within the range of θ ≧ 5 degrees and θ ₁ + θ ₂ ≧ 30 degrees.
In this embodiment, for example, the azimuth angle θ is θ = 15.
And θ ₁ + θ ₂ = 60 degrees, so that θ ₁ is 45 degrees and θ ₂ is 15 degrees. The azimuth angle θ is selected in the range of 5 degrees to 45 degrees.

Next, as shown in FIG. 2B, the metal magnetic film 3 is deposited on the surface on which the protrusion 2a is formed by a physical method such as a sputtering method or a vapor deposition method from the direction of the magnetic gap forming surface. . As the metal magnetic film (ferromagnetic metal thin film) 3, as described above, a crystalline soft magnetic material such as Fe—Al—Si alloy or an amorphous soft magnetic material such as Co—Nb—Zr alloy is selected. The thickness of the metal magnetic film 3 is set according to the characteristics of the magnetic head and the like, but the range is at least 5-10.
It is 0 μm. At this time, the magnetic film may be multi-layered with a non-magnetic film such as SiO ₂ formed by the sputtering method having a thickness of 0.05 to 0.5 μm. In this example, a Co-Nb-Zr amorphous alloy film was deposited and formed to have a film thickness of 25 μm. Further, in order to obtain the magnetic characteristics of the metal magnetic film 3, after the film formation, heat treatment is performed in a magnetic field or no magnetic field.

Next, as shown in FIG. 2C, the nonmagnetic material 5 is filled on the metal magnetic film 3. In this step, the nonmagnetic material 5 is filled to the extent that at least the remaining V-shaped groove 11 is filled on the metal magnetic film 3. As the non-magnetic material 5, a low-melting glass such as PbO-based or V ₂ O ₅ -based, or 2MgO-SiO formed by a sputtering method or a vapor deposition method.
₂ Select a ceramic material such as (forsterite).
Further, in order to prevent the diffusion of the low melting point glass and the metal magnetic film 3 or to improve the adhesive force of the ceramic material, as a pretreatment for filling the non-magnetic material 5, S
A nonmagnetic film made of an oxide nonmagnetic material such as iO ₂ or a metal nonmagnetic material such as Cr, or a combination thereof may be formed. The thickness of this non-magnetic film is 0.05 to 2
Set in the μm range. In this embodiment, the non-magnetic material 5 be the filling material, the softening temperature was used PbO-B ₂ O ₃ -based low melting point glass 390 ° C.. Further, as a diffusion preventing thin film of the non-magnetic material 5 (filled glass) and the metal magnetic film 3, Cr was deposited on the metal magnetic film 3 in a thickness of 0.2 μm.

Next, as shown in FIG. 2D, the filled non-magnetic material 5 is removed and polished. In this process,
A part of the non-magnetic material 5 and the metal magnetic film 3 on the base material block 10 is removed by mechanical polishing or the like, and the butt surface is mirror-polished. That is, as shown in FIG. 2D, polishing is performed until the metal magnetic film 3 on the top of the protrusion 2a is exposed as a flat portion having a gap abutment width T for defining a required track width Tw. Is done. Here, in this embodiment, since the azimuth angle is 15 degrees, the gap abutting width T is T = Tw / cos15. At the same time, in this step, the nonmagnetic material 5 filled in the winding window groove 12 is removed. Here, in some cases, the non-magnetic material 5 is formed so as to leave the metal magnetic film 3 in the groove 12.
May be removed. The track width Tw is 15
It is set in the range of μm to 200 μm.

After that, F shown by a one-dot chain line in FIG.
The base material block 10 is cut along the −F ′ line to form a pair of base material blocks 10A and 10B.

Next, as shown in FIG. 2E, the pair of base material blocks 10A and 10B obtained as described above are joined and integrated. In this step, a non-magnetic oxide film such as SiO ₂ or a metal non-magnetic film such as Cr, which serves as a gap-regulating thin film, or a metal non-magnetic film such as Cr, is formed on the abutting surface of at least one of the base material blocks 10A and 10B to a required thickness (for example, 0. 25
.mu.m) by a sputtering method, and then align and butt the base metal blocks 10A and 10B so that the flat portions of the metal magnetic film 3 on the tops of the protrusions 2a are aligned with each other, and in this state, The low melting point glass, which is the non-magnetic material 5, is melted by heating while pressing, and the pair of base material blocks 10A and 10B are joined and integrated by glass bonding. In this example, heating was performed at a temperature of 550 ° C. In the step of FIG. 2C, when a ceramic material formed by a sputtering method or a vapor deposition method is selected as the non-magnetic material 5, a low melting glass film that melts at least at the bonding temperature is formed on the gap regulating thin film. Keep it.

In this way, the base material blocks 10A, 10
The bonding block in which B is integrated is tilted by a predetermined angle with respect to the normal line of the magnetic gap 4 so that a required azimuth angle θ can be obtained with the magnetic gap 4 as the center, and G- in FIG. The magnetic head having the shape of the tape sliding surface shown in FIG. 1 can be obtained by cutting the tape sliding surface in order to a predetermined shape after cutting along the line G '. In this embodiment, the cutting is performed with an inclination of 15 ° with respect to the normal line of the magnetic gap 4.

FIG. 3A is a diagram showing the state of interference fringes measured by the multiple interference method on the sliding surface shape of the magnetic head having the structure shown in FIG. 1 after running the tape. As is clear from the figure, the interference fringe shape is symmetric with respect to the magnetic gap portion, and the major axis of the elliptical interference fringe matches the tape running direction. Therefore, the shape of the head sliding surface is line-symmetric with respect to the tape running width center line BB '. Further, FIG. 3B is a cross section of cutting lines H-H ', II' along the sliding width direction at the equidistant position (l = 1 ') from the magnetic gap 4 with respect to the tape running direction. In the figure showing the shape, the shape of the head sliding surface in both cross-sections is substantially the same, and is symmetrical about the magnetic gap 4 in the tape running direction. As a result, the magnetic tape comes into contact with the magnetic gap 4 vertically and horizontally symmetrically, and the magnetic head according to the present invention can obtain extremely stable tape running characteristics.

FIG. 4 is a front view seen from the tape sliding surface of the magnetic head according to the second embodiment of the present invention. In this embodiment, the substantially mountain-shaped protrusion 2a 'of the core substrate 2 is shaped such that the top portion thereof is cut flat.
The metal magnetic films 3 formed on the flat portion are abutted to each other via a gap regulating thin film to form a magnetic gap 4. Also in this embodiment, the protrusions 2a ′ of each core substrate 2
The angles θ ₃ and θ ₄ formed by the two inclined surfaces are equal to each other, and the intersection points P and P ′ of the extension lines are the tape sliding width center line D.
-Located on D '. That is, each angle θ
_The bisectors (not shown) of ₃ and θ ₄ are parallel to the tape running direction and substantially at the same position as the tape sliding width center line DD ′. As a result, the tape sliding surface has a magnetic gap 4
A magnetic head that is substantially symmetrical with respect to the center of the curve and that also has stable tape running characteristics can be obtained.

FIG. 5 is a front view of the magnetic head according to the third embodiment of the present invention as seen from the tape sliding surface. In this embodiment, the metal magnetic film 3 is the protrusion 2 having a substantially mountain shape on the core substrate 2.
It is formed only on the flat portion (only the abutting surface) on the top of a ', and the metal magnetic film 3 is not provided on the inclined surface of the protrusion 2a'. Also in this embodiment, the angles θ ₃ and θ ₄ formed by the two inclined surfaces of the protrusion 2a ′ of each core substrate 2 are equal, and the intersection points P and P ′ of the extension lines are the tape sliding width center line D. -Located on D '. That is, also in this case,
The bisectors (not shown) of the respective angles θ ₃ and θ ₄ are parallel to the tape running direction and are substantially equal to the tape sliding width center line DD ′. Therefore, the shape of the tape sliding surface is substantially symmetrical with respect to the magnetic gap 4, and a magnetic head having similarly stable tape running characteristics can be obtained.

FIG. 6 is a front view of the magnetic head according to the fourth embodiment of the present invention as seen from the tape sliding surface. In this embodiment, the metal magnetic film 3 is the protrusion 2 having a substantially mountain shape on the core substrate 2.
It is formed only on the inclined surface on one side of a. Also in this embodiment, the angles θ ₃ and θ ₄ formed by the two inclined surfaces of the protrusion 2a of each core substrate 2 are equal, and the intersection points P and P ′ of the extension lines are the tape sliding width center line D−. It is located on D ', and the bisector of each angle θ ₃ and θ ₄ (not shown)
Is parallel to the tape running direction and is the tape sliding width center line D-
It is in a position substantially equal to D '. Therefore, also in this case, the shape of the tape sliding surface is substantially symmetrical about the magnetic gap 4, and a magnetic head having stable tape running characteristics can be obtained.

The present invention has been described above with reference to the illustrated embodiment, but the present invention defines the angle setting of the inclined surface of the protrusion of the core substrate having the inclined surface oblique to the tape running direction. The shape of the tip of the protrusion and the arrangement of the metal magnetic film are not limited to the above-described embodiments. Further, in each of the above-described embodiments, an example in which the ferrite material is used for the core substrate has been described, but in addition to this, non-magnetic oxides such as ceramics and crystallized glass can be used. Needless to say, the present invention can be applied to such cases.

[0027]

As described above, according to the present invention, the shape of the inclined surface of the protrusion of the core substrate exposed on the tape sliding surface of the head can be made substantially symmetrical with respect to the center line of the tape sliding width. Therefore, the shape of the tape sliding surface is substantially symmetrical about the magnetic gap. As a result, even if there is a difference in wear resistance between the tape sliding material such as the core substrate, the metal magnetic film, and the non-magnetic material during tape running, a symmetrical wear shape centering on the magnetic gap results in a stable and good tape. A magnetic head having running characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing a tape sliding surface of a magnetic head according to a first embodiment of the invention.

FIG. 2 is an explanatory diagram showing a manufacturing process of the magnetic head having the configuration of FIG.

FIG. 3 is an explanatory diagram showing a sliding surface shape of the magnetic head having the structure of FIG. 1 after sliding the tape.

FIG. 4 is a front view showing a tape sliding surface of a magnetic head according to a second embodiment of the invention.

FIG. 5 is a front view showing a tape sliding surface of a magnetic head according to a third embodiment of the invention.

FIG. 6 is a front view showing a tape sliding surface of a magnetic head according to a fourth embodiment of the invention.

FIG. 7 is a front view showing a tape sliding surface of a conventional magnetic head.

8 is an explanatory diagram showing a sliding surface shape of the magnetic head having the structure of FIG. 7 after the tape is slid.

[Explanation of symbols]

 1A, 1B Core half body 2 Core substrate 2a, 2a 'Protrusion 3 Metal magnetic layer (ferromagnetic metal thin film) 4 Magnetic gap (operating gap) 5 Nonmagnetic material 10, 10A, 10B Base material block

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[Procedure amendment]

[Submission date] February 22, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Front page continued (72) Inventor Kenkichi Inada 1410 Inada, Katsuta City, Ibaraki Prefecture Hitachi Ltd. AV Equipment Division

Claims (6)

[Claims] 1. A pair of core halves each having a core base having a substantially mountain-shaped protrusion on the butt face side and a metal magnetic film formed on the butt face side of the core base, and a pair of the core halves. A coil wound around a winding window provided on at least one of the two, and the pair of core halves are flat portions defining a track width in the vicinity of the tops of the substantially mountain-shaped protrusions. A magnetic head in which the metal magnetic films are butted to each other through a gap restricting film (non-magnetic film) so that they are aligned with each other, a magnetic gap is formed by the gap restricting film, and the magnetic gap has a predetermined azimuth angle inclination. In the magnetic recording medium facing surface, the angles formed by the inclined surfaces of the protrusions of the core bases are substantially equal to each other, and the angle is 2
A magnetic head characterized in that the equally dividing line is substantially parallel to the tape running direction and is substantially at the same position as the center line in the tape sliding width direction. 2. The magnetic head according to claim 1, wherein the metal magnetic film is formed only near the tops of the substantially mountain-shaped protrusions. 3. The magnetic head according to claim 1, wherein the metal magnetic film is formed only on one inclined surface of the protrusion of each core substrate. 4. The azimuth angle according to claim 1, wherein the azimuth angle is 5 degrees to 45 degrees, and the track width is 1.
A magnetic head characterized in that the angle formed by both inclined surfaces of the protrusion of each core substrate is in the range of 30 degrees or more. 5. The magnetic head according to claim 1, wherein the core substrate is a magnetic material or a non-magnetic oxide material. 6. A pair of core halves having a core base having a substantially mountain-shaped protrusion on the abutting face side and a metal magnetic film formed on the abutting face side of the core base, and a pair of the core halves. A coil wound around a winding window provided on at least one of the two, and the pair of core halves are flat portions defining a track width in the vicinity of the tops of the substantially mountain-shaped protrusions. A magnetic head in which the metal magnetic films are butted to each other through a gap restricting film (non-magnetic film) so that they are aligned with each other, a magnetic gap is formed by the gap restricting film, and the magnetic gap has a predetermined azimuth angle inclination. In the manufacturing method of, the respective angles θ ₁ and θ ₂ formed by the normal line of this surface and the inclined surface on the side of the base material block that is the base material of the core base body that is the butt surface are the azimuth angles θ And θ
= ([Theta] _{1- [} theta] ₂ ) / 2, [theta] ₁ > [theta] ₂ , the step of forming a plurality of protrusions projecting in a substantially mountain shape in parallel, and forming a groove to be a winding window orthogonal to the process. And a step of forming the metal magnetic film on the protrusion formation surface to a predetermined thickness, a step of filling a nonmagnetic material on the metal magnetic film, the nonmagnetic material and the metal magnetic film. Is removed and polished to expose the flat portion of the metal magnetic film for defining the track width flush with the non-magnetic material and remove the non-magnetic material in the groove to be the window for winding. And the step of forming the gap regulating film on at least one abutting surface of the pair of base material blocks that have undergone the above-described respective steps, and then the flat portions of the metal magnetic films of the pair of base material blocks are formed. A step of joining and integrating a pair of base material blocks in a butt state; The joined / integrated base material is provided with a required azimuth angle so that the magnetic gap formed by joining flat portions of the film through the gap regulation film is substantially at the center of the tape sliding surface. A step of cutting the block, the angle between the inclined surfaces of the protrusions of the core bases being substantially equal to each other on the surface facing the magnetic recording medium, and a line dividing the angle into two equal parts is a tape running direction. A method of manufacturing a magnetic head, characterized in that a magnetic head is manufactured so as to be substantially parallel to the center line in the tape sliding width direction.