JPH08255311A - Magnetic head device - Google Patents

Abstract

PURPOSE: To decrease the generation of crazes of fused glass and to improve a production yield by lessening the generation of residual strains in ferromagnetic metallic films. CONSTITUTION: The track width regulating grooves 10 of first magnetic core half bodies 6 adjacent to each other of a pair of magnetic heads adjacent are formed as grooves of an approximately trapezoidal shape in section having flat parts in the bottom and the track width regulating grooves 11 of second magnetic core half bodies 7 of the other are formed as grooves of an approximately V shape in section having peak parts in the bottoms. A pair of the magnetic heads preferably have azimuth angles different from each other. The side faces 11a on the opening side which are the ferromagnetic metallic film forming surfaces continuous with both sides of a magnetic gap 92 formed by these track width regulating grooves 11 are preferably 70 deg.-2θ<=δ<=80 deg.-2θ when the angle formed with the gap length direction of the magnetic gap g2 is defined as δand the azimuth angle of the magnetic gap g2 as θ and α<=110 deg. when the angle of the peak parts of the track width regulating grooves 11 is defined as α.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device suitable for being mounted on a video tape recorder (hereinafter referred to as VTR). More specifically, the present invention relates to a magnetic head device in which the shape of the track width regulation groove of the magnetic head is improved and the manufacturing yield is improved.

[0002]

2. Description of the Related Art In recent years, in a magnetic recording / reproducing apparatus such as a VTR, a narrow track has been promoted along with an increase in information recording density. As a means for achieving narrow tracks, guard bandless recording having a recording pattern having no guard band between adjacent tracks is often used. When performing the guard bandless recording, a pair of magnetic heads having magnetic gaps with different azimuth angles are used in order to avoid crosstalk between the tracks, and each has an A channel and a B channel. (Hereinafter, referred to as Ach and Bch),
Recording is performed so that the Ach and Bch are adjacent to each other.

When a magnetic head is mounted on the VTR, a magnetic head device is constructed by mounting a pair of magnetic heads on the rotary drum in the VTR so as to face each other by 180 °. However, when the information is recorded by the VTR, the eccentricity of the rotating drum causes the adjacent Achs to move.
And Bch are overwritten, so-called adjacent erase easily occurs, and the output decreases when reproducing information.

Such adjacent erasure becomes an important issue when narrowing the track. For example, it is assumed that the erase width due to the adjacent erase is 1 μm. At this time, if the track pitch is 20 μm, the reduction in reproduction output is about 0.
Although it is as small as 4 dB, when the track pitch is narrowed to 10 μm, the reproduction output is reduced by about 0.9 dB, and when the track pitch is further narrowed to 5 μm, the reproduction output is reduced by about 1.9 dB. Will occur.

Therefore, in order to prevent such adjacent erasure, a pair of magnetic heads having magnetic gaps having different azimuth angles are provided so as to face each other in the head traveling direction and at the same time, in the track width direction. There has been proposed a method of mounting a magnetic head device by mounting it on the same head mounting base with a step difference of one track and mounting it on a rotating drum in a VTR to prevent adjacent erasure due to eccentricity of the rotating drum. .

[0006]

By the way, as a magnetic head mounted on the above magnetic head device, as the coercive force of the magnetic tape increases to increase the recording density, the magnetic head is placed on the opposite surface side. A pair of magnetic core halves, in which the ferromagnetic metal film is arranged in parallel to the magnetic gap, has a magnetic gap between the abutting faces of the ferromagnetic metal film and is joined and integrated by glass fusion. In-gap heads (so-called MIG heads) are being used. In particular, it is being put to practical use in a magnetic head device mounted on an 8 mm VTR.

However, in the above MIG head,
In the manufacturing process, the fused glass is likely to be cracked, and the manufacturing yield is not so good.

In the MIG head as described above, a cross section having a flat portion at the bottom on the facing surface of the magnetic core halves in order to regulate the abutting surface width of the pair of magnetic core halves, that is, the track width of the magnetic gap. The substantially trapezoidal track width regulating groove is formed, and the ferromagnetic metal film formed on the facing surface side of the magnetic core half body is also formed inside the track width regulating groove. Since the ferromagnetic metal film is continuous even in the flat portion at the bottom of the track width regulating groove, residual strain is likely to occur in the ferromagnetic metal film. Under this influence, when the pair of magnetic core halves are joined and integrated by glass fusion, the fused glass is likely to be cracked, and the manufacturing yield is not so good.

Therefore, it has been considered that the track width regulating groove is formed in a V shape in cross section and the ferromagnetic metal film is divided at the bottom of the track width regulating groove.

However, in the above-described magnetic head device, it is also required to reduce the distance between the magnetic gaps of the pair of magnetic heads to 700 μm or less, and the track width of the magnetic head of such a magnetic head device is required. It is difficult to make the restriction groove V-shaped as described above.

As described above, the distance between the magnetic gaps is set to 7
In order to reduce the thickness to 00 μm or less, of the pair of magnetic core halves of each magnetic head, the thickness in the gap length direction of the magnetic core half that is arranged on the surface facing the other magnetic head is 250 μm.
It should be about m.

However, when the track width regulating groove of the magnetic core half body is formed into a groove having a substantially V-shaped cross section, a certain depth of groove is required, and as described above, the magnetic core half body has a gap length direction. If the thickness is about 250 μm, there is a high possibility that the groove depth will exceed the above thickness. When the groove portion exceeding the thickness of the magnetic core half body is formed in this way, after the pair of magnetic core half bodies are joined and integrated, the magnetic core half body arranged on the opposing surface side is cut to the above thickness. In this step, it is necessary to cut across the groove and the fused glass, which may damage the magnetic head.

Therefore, as the magnetic head of the magnetic head device as described above, the magnetic head having the track width regulation groove having a substantially trapezoidal cross section has to be used, which causes a problem in manufacturing yield.

Therefore, the present invention has been proposed in view of the conventional circumstances, and reduces the occurrence of residual strain in the ferromagnetic metal film to reduce the occurrence of cracks in the fused glass and improve the manufacturing yield. An object of the present invention is to provide a magnetic head device that enables the above.

[0015]

In order to solve the above problems, the present invention comprises a ferromagnetic metal film formed on the facing surface of a magnetic core half body whose track width is restricted by a track width restriction groove. In a magnetic head device including a magnetic head formed by joining and integrating magnetic core halves, and a pair of magnetic heads are arranged such that a distance between magnetic gaps is 700 μm or less, a track width of magnetic core halves adjacent to each other. The regulation groove is a groove having a substantially trapezoidal cross section having a flat portion at the bottom, and the track width regulation groove of the other magnetic core half is a substantially V-shaped groove having a top at the bottom. It is characterized by.

In the magnetic head device of the present invention, it is preferable that the magnetic gaps of the pair of magnetic heads have different azimuth angles.

Further, in the above magnetic head device, the angle formed by the ferromagnetic metal film forming surfaces which are formed by the track width regulating groove having a substantially V-shaped cross section and are continuous with both sides of the magnetic gap portion with the gap length direction of the magnetic gap is δ. And the azimuth angle of the magnetic gap is θ, 70 ° -2θ ≦ δ ≦ 8
It is preferable that α ≦ 110 °, where 0 ° -2θ and an angle of the top of the track width regulating groove having a substantially V-shaped cross section.

If the angle δ is larger than 80 ° -2θ, the information signal of the other magnetic head having a different azimuth angle is reproduced, which is not preferable.

If the angle α is larger than 110 °, the effect of reducing the residual strain of the ferromagnetic metal film is reduced. The lower limit of the angle α is determined in consideration of δ, and will not be smaller than 140 ° -4θ.

[0020]

In the magnetic head device of the present invention, the track width regulating grooves of the adjacent magnetic core halves of the adjacent magnetic heads are substantially trapezoidal in cross section having a flat portion at the bottom, and the other magnetic head is Since the track width regulating groove of the core half is a groove having a V-shaped cross section having a top at the bottom, the ferromagnetic metal film formed on the facing surface of the other magnetic core half is the track width. It is divided at the bottom of the regulation groove,
The residual strain generated in the ferromagnetic metal film is reduced. Therefore, the influence of the residual strain of the ferromagnetic metal film on the fused glass of the magnetic head is reduced, and the occurrence of cracks in the fused glass is reduced.

In the magnetic head device of the present invention,
The angle formed by the ferromagnetic metal film formation surfaces, which are formed by the track width regulating grooves having a substantially V-shaped cross section and are continuous on both sides of the magnetic gap portion, with the gap length direction of the magnetic gap is δ, and the azimuth angle of the magnetic gap is θ. In case of 70 ° -2θ ≦ δ
If ≦ 80 ° −2θ, the information signal of the other magnetic head having a different azimuth angle will not be reproduced. Furthermore, the angle α of the top of the track width regulating groove is set to α ≦ 110.
Within the range of 0 °, the residual strain of the ferromagnetic metal film is sufficiently reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

In the magnetic head device of this embodiment, as shown in FIG. 1, a pair of magnetic heads 1 and 2 having magnetic gaps g ₁ and g ₂ having different azimuth angles are shown by arrows M in the figure. Are opposed to each other in the head running direction and are fixed on the same head mounting base 3 having a substantially plate shape with a step difference of one track in the track width direction.

In the magnetic head device of this embodiment, the distance D between the magnetic gaps g ₁ and g ₂ of the magnetic heads ₁ and ₂ is 700 μm or less.

The magnetic head 1 is composed of a plate-shaped magnetic core half body 4 and a magnetic core half body 5 having a substantially U-shaped cross section which are joined and integrated, and one magnetic head 2 is also plate-shaped. The magnetic core half body 6 and the magnetic core half body 7 having a substantially U-shaped cross section are joined and integrated. At this time, the magnetic heads 1 and 2 are mounted on the head mounting base 3 so that the plate-shaped magnetic core halves 4 and 6 (hereinafter referred to as the first magnetic core halves 4 and 6) are adjacent to each other. It is fixed to.

Further, the magnetic core halves 5, 7 having a substantially U-shaped cross section
A winding groove 8 for winding a coil (not shown) on the facing surface side of the (hereinafter, referred to as second magnetic core halves 5 and 7),
9 are provided respectively, and winding auxiliary grooves 15 and 16 for assisting the winding of the coil are provided at the positions opposed to each other. It should be noted that step portions 17 and 18 are formed on the side of the medium facing surfaces 1a and 2a facing the magnetic gaps g ₁ and g ₂ of the magnetic heads 1 and 2 to regulate the width of contact of the magnetic heads 1 and 2 with the medium. Has been done.

Further, in the magnetic heads 1 and 2 of the magnetic head device of this embodiment, as shown in FIG. 2 (however, only the magnetic head 2 is shown in FIG. 2), the first magnetic core half Track width regulating grooves 10 and 11 are respectively formed on the surfaces of the body 6 and the second magnetic core half body 7 facing each other, and a fusion glass 12 is melt-filled in a window portion between the track width regulating grooves 10 and 11. The first and second magnetic core halves 6 and 7 are integrally joined together.

Furthermore, in the magnetic head device of this embodiment, the ferromagnetic material parallel to the magnetic gap g _{2 is formed} on the facing surfaces of the first magnetic core half body 6 and the second magnetic core half body 7. Metal films 13 and 14 are formed respectively, and the ferromagnetic metal film 1 is also formed in the track width regulating grooves 10 and 11.
3, 14 are formed.

At this time, in the magnetic head device of this embodiment, the track width regulating groove 10 formed in the first magnetic core half body 6 is formed as a groove portion having a flat portion at the bottom and a substantially trapezoidal cross section. The track width regulation groove 11 formed in the other second magnetic core half body 7 is formed as a groove having a V-shaped cross section having a top at the bottom.

Further, in the magnetic head device of this embodiment, the track width regulating groove 11 formed in the second magnetic core half body 7 has a shape in which the track width regulating groove 11 has two bent portions in addition to the top portion. It is V-shaped. The angle between the side surface 11a on the opening side, which is the metal magnetic film forming surface, on both sides of the magnetic gap g ₂ of the track width regulation groove 11 and the gap length direction of the magnetic gap g ₂ is δ, and the azimuth angle of the magnetic gap is When θ is set, the angle δ is 70 ° −2θ ≦ δ ≦
The range is 80 ° -2θ. When the angle of the top of the track width regulating groove 11 is α, α is
≦ 110 °.

Specifically, the azimuth angle θ of the magnetic gap g ₂ is 20 °, the angle δ is 30 °, and the other two of the top parts are
Side surface 11 of track width regulating groove 11 at the bent portion
The angle β formed by b with the gap length direction of the magnetic gap g ₂ is 40 °, and the angle α is 80 °.

On the other hand, in the track width regulating groove 10 formed in the first magnetic core half body 6, the side surface 10a has a magnetic gap g.
_The angle γ formed with the gap length direction of ₂ is 30 °, and both side surfaces are formed as substantially trapezoidal groove portions having inclined surfaces having the same inclination angle.

Therefore, in the magnetic head device of the present embodiment, the second magnetic core half body 7 which is the outside of the magnetic head 2 is used.
Since the track width regulating groove 11 formed in the second magnetic core has a substantially V-shaped cross section, the ferromagnetic metal film 14 formed on the facing surface of the second magnetic core half body 7 has the track width regulating groove 11 formed therein.
The residual strain generated in the ferromagnetic metal film 14 due to the division at the bottom is reduced. The same applies to the magnetic head 1. Therefore, in each of the magnetic heads 1 and 2, the influence of the residual strain of the ferromagnetic metal film on the fused glass is reduced, the occurrence of cracks in the fused glass is reduced, and the manufacturing yield is improved.

Further, in the magnetic head device of the present embodiment, the opening side, which is a metal magnetic film forming surface, is formed on both sides of the magnetic gap of the track width regulating groove of the second magnetic core half body on the outside of each magnetic head. Of the azimuth angle of the magnetic gap is θ
In this case, since the range is 70 ° -2θ ≦ δ ≦ 80 ° -2θ, the information signal of the other magnetic head will not be reproduced.

Further, in the magnetic head device of this embodiment, the angle α of the top of the track width regulating groove is α ≦ 11.
Since the angle is 0 °, the residual strain of the ferromagnetic metal film is sufficiently reduced.

Next, a method of manufacturing the magnetic head device of this embodiment will be described in the order of steps. In order to manufacture the magnetic head device of this embodiment, first, the magnetic head to be mounted is manufactured.

That is, first, a substrate made of an oxide magnetic material such as magnetic ferrite is flattened,
A substrate 21 as shown in FIG. 3 is obtained. Although the single crystal Mn-Zn magnetic ferrite material is used here, in addition to the Mn-Zn magnetic ferrite material, a single crystal or a polycrystal such as a Ni-Zn ferrite material or a junction of the single crystal and the polycrystal. Wood can also be used. At this time, the substrate 21 has one main surface 21a serving as a magnetic gap forming surface as a (100) surface and main surfaces 21b and 21c orthogonal to the one main surface 21a as a (110) surface.

Next, as shown in FIG. 4, a winding groove 22 having a substantially trapezoidal cross-section extending in the longitudinal direction and a substantially cross-sectional shape in a region approximately half of one main surface 21a serving as a magnetic gap forming surface of the substrate 21. The U-shaped glass groove 23 is formed using a slicer or the like.
However, since the side surface of the winding groove 22 opposite to the glass groove 23 determines the depth of the magnetic gap, it is an inclined surface.

Then, the above-mentioned substrate 21 is cut and divided, and FIG.
As shown in, the second magnetic core half block 24 in which the winding groove 22 and the glass groove 23 are formed and the substantially plate-shaped first magnetic core half block 25 are formed. In addition, the second
Of the magnetic core half block 24 constitutes a second magnetic core half body disposed outside the magnetic head in the subsequent step, and the first magnetic core half block 25 of the other magnetic core half block 25 in the subsequent step. First arranged so as to be adjacent to the head
It constitutes the magnetic core half body.

Next, as shown in FIG. 6, a track width restricting groove 27 is formed by using a slicer or the like on one main surface 25a which is a magnetic gap forming surface of the first magnetic core half block 25, and Also in the second magnetic core half block 24, a track width regulation groove 26 extending in a direction orthogonal to the winding groove 22 and the glass groove 23 is formed on one main surface 24a which is a magnetic gap forming surface by using a slicer or the like. To do.

At this time, in this embodiment, the first
7, the magnetic core half block 25 has a substantially trapezoidal cross section with a flat portion at the bottom as shown in FIG.
A track width regulating groove 27 having an inclined surface b is formed. The side surface 27a of the track width regulation groove 27,
The angle γ formed by 27b with the gap length direction of the magnetic gap formed in the subsequent step is 30 °.

Further, in the present embodiment, the second magnetic core half block 24 has a track width of approximately V-shaped cross section having two bent portions in addition to the top portion as shown in FIG. The restriction groove 26 is formed. In the track width restricting groove 26, the angle δ between the side surfaces 26a and 26b on the opening side and the gap length direction of the magnetic gap formed in the subsequent step is 30 °, and the angle α of the top is 80 °. The angle β formed by the side surfaces 26c and 26d of the track width regulation groove 26 at the other two bent portions with the gap length direction of the magnetic gap is 40 °.

Subsequently, one main surface 25 of the first magnetic core half block 25 and the second magnetic core half block 24 described above.
Mirror finishing is performed on the portion left by the formation of the grooves a and 24a.

Next, as shown in FIG. 9, a ferromagnetic metal film 28 is formed on one main surface 25a of the first magnetic core half block 25 including the inside of the track width regulating groove 27 by a method such as sputtering. Then, a gap film (not shown) for forming a predetermined gap length is formed thereon.

Further, as shown in FIG. 10, a ferromagnetic metal film 29 is formed on one main surface 24a of the second magnetic core half block 24 including the inside of the track width regulating groove 26 by a method such as sputtering. Then, a gap film (not shown) for forming a predetermined gap length is formed thereon.

At this time, in the present embodiment, since the track width regulating groove 26 formed in the second magnetic core half block 24 has a substantially V-shaped cross section having a top at the bottom, it is strong. Since the magnetic metal film 29 is divided at the bottom, residual strain is unlikely to occur in the ferromagnetic metal film 29.

As the ferromagnetic metal films 28 and 29, sendust (Al-Si-Fe), sendust containing O or N, or Fe-Ru-Ga-S is used.
i or a crystalline magnetic film in which O or N is added to it, Fe system, C
An o-based microcrystalline film or the like can be used. Here, Fe-Ru-Ga-Si films are formed as the ferromagnetic metal films 28 and 29.

Further, as the gap film, SiO is used.
₂ , oxide films such as Ta ₂ O ₅ , nitride films such as Si ₃ N ₄ , metal films such as Cr, Al, Si and Pt and alloy films thereof, or laminated films combining these can be used. is there. Here, a SiO ₂ film is formed as the gap film.

Furthermore, in order to improve the adhesion between the first and second magnetic core half blocks 25 and 24 and the ferromagnetic metal films 28 and 29, a base film of the ferromagnetic metal films 28 and 29 is formed. The base film may be made of SiO ₂ , Ta ₂
O ₅ such as an oxide film, Si ₃ N ₄ or the like nitride film, Cr, A
A metal film of l, Si, Pt, or the like, an alloy film thereof, or a laminated film in which these are combined can be used. Here, a SiO ₂ film having a film thickness of 5 nm is formed as the base film.

Next, as shown in FIG. 11, the first magnetic core half body block 25 and the second magnetic core half body block 24.
Are integrated by fusion of low melting point glass to form a magnetic head block 31.

At this time, first, the ferromagnetic metal films 28 and 29 of the first and second magnetic core half blocks 25 and 24 are made to face each other (however, in FIG. The track width regulating grooves are aligned with each other. And in this state the winding groove 2
2 and the first magnetic core half block 25, the window portion and the glass groove 23 formed between the first magnetic core half block 25 and the first magnetic core half block 25.
With a rod-shaped low-melting glass having a low melting point inserted into the window formed between them, pressure is applied as shown by an arrow P in the figure, and the first and second magnetic core half blocks 25 and 24 are pressed against each other. 5
It is heated to about 00 to 700 ° C., and the fused glass 30 is melted and filled from each window portion to the window portion formed by the track width regulating grooves. As a result, the first magnetic core block 25 and the second magnetic core block 24 are joined and integrated, and a magnetic gap is formed between the abutting surfaces of the ferromagnetic metal film.

At this time, in the present embodiment, the track width regulating groove formed in the second magnetic core half block 24 has a V-shaped cross section having a top at the bottom, and is formed on this. Since the residual strain is less likely to occur in the ferromagnetic metal film being formed, the influence of the residual strain of the ferromagnetic metal film on the fused glass filled in the window between the track width regulating grooves is also reduced, The occurrence of cracks is reduced and the manufacturing yield is improved.

Next, as shown in FIG. 12, the first magnetic core half block 25 of the magnetic head block 31 is polished to a predetermined thickness by using a surface grinder or the like. At this time,
In the present embodiment, the first magnetic core half block 25
The track width restricting groove formed in is a groove having a substantially trapezoidal cross section having a flat portion at the bottom with both side surfaces being inclined, and the groove having the substantially trapezoidal cross section has a relatively shallow depth. Even if the polishing is performed as described above, the surface to be polished does not reach the fused glass portion beyond the track width regulation groove, and the magnetic head block is not damaged. Therefore, the recording characteristics of the magnetic head are not impaired.

Subsequently, the one main surface 31a of the magnetic head block 31, which is the medium facing surface, is cylindrically ground.

Then, as shown in FIG. 13, a winding auxiliary groove 32 is formed at a position facing the winding groove 22 of the magnetic head block 31 to regulate the width of contact with the medium at each magnetic gap forming portion. A contact width regulating groove (not shown) is formed.

Finally, the magnetic head block 31 is cut into a predetermined chip thickness and chip length to obtain a plurality of magnetic heads 33. The formation of the contact width regulation groove and the cutting into the chip thickness are performed so that a desired azimuth angle can be given to the magnetic gap.

Next, of the plurality of magnetic heads, the two magnetic heads having magnetic gaps having different azimuth angles are magnetic heads 1 and 2, and as shown in FIG. The magnetic head device of this embodiment as shown in FIG. 1 is fixed on the head mounting base 3 so that the distance D between the magnetic gaps g ₁ and g ₂ is 700 μm or less, facing each other in the running direction. To complete.

The magnetic head mounted in the conventional magnetic head device in which the track width regulating grooves formed in the pair of magnetic core halves are both substantially trapezoidal in cross section and the magnetic head device of this embodiment. When the manufacturing yield of the magnetic head mounted on the magnetic head was investigated, the crack occurrence rate in the fused glass was 10% in the conventional magnetic head, but was 3% in the magnetic head of this embodiment. Therefore,
It was confirmed that by suppressing the residual strain of the ferromagnetic metal film by devising the shape of the track width regulating groove as in this example, the occurrence of cracks in the fused glass was reduced and the manufacturing yield was improved. .

[0059]

As is apparent from the above description, in the magnetic head device of the present invention, the track width regulating grooves of the magnetic core halves adjacent to each other of the adjacent magnetic heads have a substantially flat cross section. With a trapezoidal groove,
Since the track width regulating groove of the other magnetic core half is a groove having a V-shaped cross section with a top at the bottom, the ferromagnetic metal film formed on the facing surface of the other magnetic core half. Is divided at the bottom surface of the track width regulation groove, and the residual strain generated in the ferromagnetic metal film is reduced. Therefore, the effect of the residual strain of the ferromagnetic metal film on the fused glass of the magnetic head is reduced, and the occurrence of cracks in the fused glass is reduced.
Manufacturing yield is improved.

In the magnetic head device of the present invention,
The angle formed by the ferromagnetic metal film formation surfaces, which are formed by the track width regulating grooves having a substantially V-shaped cross section and are continuous on both sides of the magnetic gap portion, with the gap length direction of the magnetic gap is δ, and the azimuth angle of the magnetic gap is θ. In case of 70 ° -2θ ≦ δ
If ≦ 80 ° −2θ, the information signal of the other magnetic head having a different azimuth angle will not be reproduced. Furthermore, the angle α of the top of the track width regulating groove is set to α ≦ 110.
Within the range of 0 °, the residual strain of the ferromagnetic metal film is sufficiently reduced.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a magnetic head device to which the present invention is applied.

FIG. 2 is an enlarged plan view showing a portion near a magnetic gap of a magnetic head of a magnetic head device to which the present invention is applied.

FIG. 3 is a perspective view showing a method of manufacturing a magnetic head device to which the present invention is applied, in the order of steps, showing steps of obtaining a substrate.

FIG. 4 is a perspective view showing a method of manufacturing a magnetic head device to which the present invention is applied in the order of steps, showing steps of forming winding grooves and glass grooves on a substrate.

FIG. 5 is a perspective view showing a method of manufacturing a magnetic head device to which the present invention is applied, in order of steps, showing steps of obtaining a magnetic core half block by cutting and dividing a substrate.

FIG. 6 is a perspective view showing a method of manufacturing a magnetic head device to which the present invention is applied in the order of steps, and is a perspective view showing a step of forming a track width regulating groove in a magnetic core half block.

FIG. 7 is a main part enlarged perspective view showing the method of manufacturing the magnetic head device to which the present invention is applied in the order of steps, and showing a step of forming the track width regulating groove in the first magnetic core half block.

FIG. 8 is a main part enlarged perspective view showing the method of manufacturing the magnetic head device to which the present invention is applied in the order of steps, and showing a step of forming the track width regulating groove in the second magnetic core half block.

FIG. 9 is an enlarged perspective view of a main part showing a method of manufacturing a magnetic head device to which the present invention is applied, in order of steps, and showing a step of forming a ferromagnetic metal film on the first magnetic core half block.

FIG. 10 is a main part enlarged perspective view showing the method of manufacturing the magnetic head device to which the present invention is applied in the order of steps, and showing a step of forming a ferromagnetic metal film on the second magnetic core half block.

FIG. 11 is a perspective view showing the method of manufacturing the magnetic head device to which the present invention is applied in the order of steps, showing a step of forming the magnetic head block by joining and integrating the first and second magnetic core half blocks. is there.

FIG. 12 shows a method of manufacturing a magnetic head device to which the present invention is applied in the order of steps, showing a first magnetic head block.
FIG. 6 is a perspective view showing a step of polishing the magnetic core half block and polishing one main surface which is a medium facing surface.

FIG. 13 is a perspective view showing a method of manufacturing a magnetic head device to which the present invention is applied, in the order of steps, in which a winding auxiliary groove is formed in a magnetic head block and is cut to obtain a magnetic head. is there.

[Explanation of symbols]

1, 2 ... Magnetic head 4, 6 ... First magnetic core half body 5, 7 ... Second magnetic core half body 10, 11 ... Track width regulation groove 10a, 11a, 11b. ..Side surfaces 13, 14 ... Ferromagnetic metal film g ₁ , g ₂ ... Magnetic gap D ... Distance M ... Head traveling direction α, γ, δ ... Angle θ ... Azimuth angle

Claims (3)

[Claims] 1. A magnetic head comprising a magnetic core half body having a ferromagnetic metal film formed on the facing surface of the magnetic core half body whose track width is regulated by a track width regulation groove. In a magnetic head device in which the magnetic heads are arranged such that the distance between magnetic gaps is 700 μm or less, the track width regulation grooves of the magnetic core halves adjacent to each other have a substantially trapezoidal cross section having a flat portion at the bottom. As well as
A magnetic head device characterized in that the track width regulating groove of the other half of the magnetic core is a groove having a V-shaped cross section having a top at the bottom. 2. The magnetic gaps of a pair of magnetic heads have different azimuth angles from each other.
The magnetic head device described. 3. The azimuth of the magnetic gap is defined by an angle δ between the ferromagnetic metal film forming surfaces which are formed by the track width regulating grooves having a substantially V-shaped cross section and are continuous with both sides of the magnetic gap portion with the gap length direction of the magnetic gap. If the angle is θ, 7
0 ° -2θ ≦ δ ≦ 80 ° -2θ, and the cross section is approximately V
When the angle of the top of the letter-shaped track width regulation groove is α,
The magnetic head device according to claim 2, wherein α ≦ 110 °.