JPH10105914A - Magnetic head and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide a magnetic head having good magnetic performance such as magnetic permeability and good recording and reproducing characteristics, and a method of manufacturing the same. SOLUTION: In a magnetic head 1, a pair of magnetic core halves 2A and 2B made of a magnetic material are abutted via a non-magnetic material to form a magnetic gap 4, and the magnetic core halves 2A and 2B are joined to each other. Track width regulating grooves 7A, 7 respectively
B is formed by grinding, and the track gap regulating grooves 7A and 7B are filled with a non-magnetic material to form the magnetic gap 4A.
The grinding width in the track width direction of the track width regulating grooves 7A, 7B is within the width of the magnetic core halves 2A, 2B, and is located on the side surfaces of the magnetic core halves 2A, 2B. The track width regulating groove is not exposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head suitable for recording and / or reproducing data from a magnetic recording medium such as a magnetic tape and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in the field of magnetic recording, high-density recording of information signals on magnetic recording media has been promoted.
Accordingly, in the magnetic recording medium, the wavelength of a signal recorded on the magnetic recording medium has been shortened. In order to record or reproduce data on or from the magnetic recording medium on which high-density recording has been performed, the track width of the magnetic head has been narrowed and the output has been increased.

As shown in FIG. 10, a magnetic head 100 has a pair of magnetic core halves 102A, 1A forming a closed magnetic circuit.
02B and the pair of magnetic core halves 102A and 102B.
A gap film 103 made of a non-magnetic material disposed between
The pair of magnetic core halves 102A and 102B are composed of glass portions 104 embedded in side surfaces. The magnetic head 100 has coils (not shown) wound around a pair of magnetic core halves 102A and 102B, respectively.

A pair of magnetic core halves 102A, 102B
Is formed of a ferromagnetic oxide, and forms a closed magnetic path by being joined via the gap film 103. The pair of magnetic core halves 102A and 102B are provided with a track width regulating groove 105 on the abutting surfaces thereof in an abutted state. The track width regulating groove 105 regulates the track width of the magnetic head 100, and is provided in a pair on both side surfaces of the magnetic head 100.

[0005] The gap film 103 is disposed between the pair of magnetic core halves 102A and 102B. By this,
The gap film 103 includes a pair of magnetic core halves 102A, 1A.
A magnetic gap that magnetically blocks the closed magnetic path formed by the second magnetic field 02B is formed.

The glass portion 104 is made of a low-melting glass material or the like, and the low-melting glass material is filled into a track width regulating groove 105 provided on both side surfaces of the pair of magnetic core halves 102A and 102B in a molten state. The low melting glass material is formed by solidification. Thereby, the glass part 104 joins the pair of magnetic core halves 102A and 102B.

The magnetic head 100 has a structure shown in FIG.
A pair of contact width regulating grooves 106 are formed on the sliding surface of the magnetic recording medium indicated by the middle A in parallel with the traveling direction of the magnetic recording medium. The contact width regulating groove 106 regulates the contact width between the magnetic recording medium and the magnetic head 100. Thereby, the magnetic head 100 can be brought into good contact with the magnetic recording medium.

The conventional magnetic head 100 configured as described above has a plurality of magnetic heads 1 as shown in FIG.
00 are formed simultaneously. In this case, the magnetic head 100
In this example, a plurality of magnetic head halves 102A and 102B are formed on substrates 109A and 109B.
A and 109B are joined to form a magnetic head block 110, which is then separated into individual magnetic heads 100. At this time, in the magnetic head block 110, cylindrical processing is performed on the side surface B which is the magnetic recording medium sliding surface A of the magnetic head 100.

Thereafter, in the magnetic head block 110, the position corresponding to the contact width regulating groove 106 of each magnetic head 100, that is, between the solid line C1-C1 and the dotted line D1-D1 in FIG. 11 and in FIG. Grinding is performed between the solid line C2-C2 and the dotted line D2-D2. As a result, each magnetic head 10 is
A step that becomes the zero hit width regulating groove 106 is formed.

Then, in the magnetic head block 110,
In FIG. 11, cutting is performed on the solid line C1-C1 and the solid line C2-C2. Thereby, the magnetic head block 11
From 0, the individual magnetic heads 100 are separated.

[0011]

However, in the above-described conventional magnetic head 100, the magnetic permeability of the ferromagnetic oxide forming the pair of magnetic core halves 102A and 102B is reduced. That is, the magnetic conversion characteristics of the magnetic head 100 are deteriorated because the magnetic permeability of the pair of magnetic core halves 102A and 102B is reduced.

Therefore, the conventional magnetic head 100 has a problem that the recording / reproducing characteristics for the magnetic recording medium are deteriorated.

Therefore, the present invention solves the problems of such a conventional magnetic head and a method of manufacturing the same, and provides a magnetic head having good magnetic performance such as magnetic permeability and good recording / reproducing characteristics. It is intended to provide a manufacturing method.

[0014]

The inventors of the present invention have made intensive studies to achieve the above-mentioned object, and as a result, the magnetic permeability of the pair of magnetic core halves deteriorated due to distortion of the magnetic material. I found something. The inventor has concluded that the fact that no distortion occurs in the magnetic material improves the magnetic permeability of the pair of magnetic core halves.

The inventor of the present invention has found that the cause of the distortion of the magnetic body is that the grinding of a member having a lower grinding rate than the magnetic body causes the distortion of the member. I came up with the idea of having an effect.

That is, in the magnetic head according to the present invention that has achieved the above-mentioned object, a pair of magnetic core halves made of a magnetic material are abutted via a non-magnetic material to form a magnetic gap, and the magnetic core is formed. A track width regulating groove is formed on each half by grinding, and the track width of the magnetic gap is regulated by filling the track width regulating groove with a non-magnetic material, and the track width regulating groove in the track width direction is formed. The grinding area is within the width of the magnetic core half, and the track width regulating groove is not exposed on the side surface of the magnetic core half.

In the magnetic head according to the present invention configured as described above, the track width regulating groove is formed without being exposed on the surface substantially perpendicular to the surface in contact with the magnetic recording medium. For this reason, in this magnetic head, since the side surface is made of a uniform material, the cutting rate on the side surface when cutting by cutting or the like is made uniform. That is,
With this magnetic head, there is no need to cut the non-magnetic material filling the track width regulating groove. Therefore, this magnetic head is formed without causing distortion in the magnetic material constituting the magnetic core due to cutting or the like. by this,
In this magnetic head, since the distortion in the magnetic body is small,
It has good magnetic permeability.

In the magnetic head according to the present invention, a contact width regulating groove for regulating a contact width with respect to a magnetic recording medium is formed in the magnetic core half, and an outer end of the track width regulating groove has the contact width. The configuration may be such that the position matches or exceeds the side edge of the restriction groove.

In the magnetic head according to the present invention configured as described above, the grinding amount of the non-magnetic material filled in the track width regulating groove can be reduced in the grinding process for forming the contact width regulating groove. it can. That is, the magnetic head is configured so that the contact width with the magnetic recording medium can be regulated by grinding substantially only the magnetic material. For this reason, in this magnetic head, distortion does not occur in the magnetic material due to the grinding when forming the contact width regulating groove. Therefore, this magnetic head has a better magnetic permeability because distortion in the magnetic body is reduced.

On the other hand, a method of manufacturing a magnetic head according to the present invention comprises the steps of: forming a pair of magnetic core halves made of a magnetic material by grinding track width regulating grooves having predetermined intervals; To form a magnetic gap by interposing a nonmagnetic material, and to fill the track width regulating groove with a nonmagnetic material to join the pair of magnetic core halves. The method of manufacturing a magnetic head is characterized in that the grinding area of the track width regulating groove in the track width direction is within the width of the magnetic core half, and the track width regulating groove is not exposed on the side surface of the magnetic core half. And

In the method of manufacturing a magnetic head according to the present invention having the above-described configuration, the track width regulating groove is formed without being exposed on a surface substantially perpendicular to the surface in contact with the magnetic recording medium. For this reason, in this method of manufacturing a magnetic head, the cutting rate on the side surface when the side surface is cut by cutting or the like is made uniform. That is, in the method of manufacturing the magnetic head, it is not necessary to cut the non-magnetic material filling the track width regulating groove. Therefore, according to the method of manufacturing the magnetic head, the magnetic core can be formed without causing distortion of the magnetic material due to cutting or the like. Thereby, in the method of manufacturing the magnetic head, since the distortion in the magnetic body of the manufactured magnetic head is reduced,
A magnetic head having good magnetic permeability can be manufactured.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnetic head and a method of manufacturing the same according to an embodiment of the present invention will be described in detail with reference to the drawings.

First, the magnetic head according to the present embodiment
As shown in FIG. 1, a magnetic head 1 is used for a magnetic recording medium or the like. The magnetic head 1 includes a pair of magnetic core halves 2A and 2B forming a closed magnetic path, a gap film 4 disposed between the pair of magnetic core halves 2A and 2B,
And glass portions 5 arranged on both sides of the gap film 4. Further, a coil (not shown) is wound around the magnetic head 1.

The magnetic head 1 has a contact width regulating groove 6 for regulating the width of the medium contact surface A, with the surface indicated by A in FIG. The contact width regulating groove 6 is provided in parallel with the direction in which the magnetic recording medium slides with the gap film 4 interposed therebetween. In this magnetic head 1, the medium sliding surface A is machined on a cylinder, and is formed such that the portion where the gap film 4 is exposed is the highest position.

The magnetic head 1 is configured to form a closed magnetic path by abutting a pair of magnetic core halves 2A and 2B. The magnetic core halves 2A and 2B
It has a substantially U-shaped cross section and is composed of Mn-Zn ferrite, Ni-Z
It is made of an oxide soft magnetic material such as n ferrite.
The magnetic head 1 has a pair of track width regulating grooves 7A, 7B formed on the butting surfaces of the magnetic core halves 2A, 2B. Glass portions 5 described later are formed in the track width regulating grooves 7A and 7B. Also, the magnetic core halves 2A and 2B
Are formed with the track width regulating grooves 7A and 7B to regulate the width dimension of the gap film 4 described later.

The pair of magnetic core halves 2A and 2B have a gap depth regulating groove 8 which forms an opening for winding a coil when butted against each other. The gap depth regulating groove 8 is formed in a groove shape on the abutting surfaces of the magnetic core halves 2A and 2B. The gap depth regulating groove 8 regulates the depth dimension of the gap film 4 from the medium sliding surface A, that is, regulates the gap depth.

The gap film 4 serves as a magnetic gap in the magnetic head 1 and is made of a non-magnetic material such as Ta ₂
Consisting of O _5. The width of the gap film 4 is regulated by the above-described track width regulating grooves 7A and 7B. Therefore, in this magnetic head 1, the width dimension sandwiched by the pair of track width regulating grooves 7A and 7B is the track width.

The track width regulating grooves 7A and 7B are formed by abutting a pair of magnetic core halves 2A and 2B, respectively. That is, the track width regulating grooves 7A, 7A
B is configured such that a pair of grooves respectively formed on the abutting surfaces of the magnetic core halves 2A and 2B abut against each other. In this magnetic head 1, the track width regulating groove 7
A and 7B are exposed on the medium sliding surface A and are formed so as not to be exposed from the side surface of the magnetic head 1.

The pair of track width regulating grooves 7
A and 7B are provided with a glass portion 5 described later.
Therefore, in the magnetic head 1, the glass portion 5 is not exposed on a surface substantially orthogonal to the medium sliding surface A. In addition, the magnetic head 1 is configured such that the glass portion 5 is hardly exposed in the contact width regulating groove 6.

In the magnetic head 1, the outer ends of the pair of track width regulating grooves 7A and 7B are preferably formed at positions corresponding to the side edges of the pair of contact width regulating grooves 6 described above. That is, the pair of track width regulating grooves 7
A and 7B are preferably exposed only to the convex portions formed by the pair of contact width regulating grooves 6. At this time, the magnetic head 1 is configured such that the glass portion 5 filled in the track width regulating grooves 7A and 7B is not exposed to the hitting width regulating groove 6.

The glass portion 5 is made of a non-magnetic insulator, for example, a low-melting glass material. As will be described in detail later, the glass portion 5 is formed, for example, by filling a molten low-melting glass material into the track width regulating grooves 7A and 7B and solidifying it.

The magnetic head 1 configured as described above
A signal magnetic field from the magnetic recording medium is detected, and a signal magnetic field is applied to the magnetic recording medium. At this time, in the magnetic head 1, a pair of magnetic core halves 2 </ b> A and 2 </ b> B are abutted through the gap film 4 to form a closed magnetic path.

In the magnetic head 1, a magnetic field generated from a coil (not shown) becomes a leakage magnetic field at the gap film 4. The signal magnetic field can be recorded by applying this leakage magnetic field to the magnetic recording medium. The magnetic head 1 detects a signal magnetic field by applying a signal magnetic field from a magnetic recording medium to the vicinity of the gap film 4.

Next, a method for manufacturing a magnetic head according to the present invention will be described in detail with reference to the drawings. At this time, a method of manufacturing the above-described magnetic head 1 will be described as an embodiment of the method of manufacturing a magnetic head according to the present invention.

In manufacturing the magnetic head 1 described above,
First, as shown in FIG.
Prepare The ferrite substrate 10 is made of an oxide soft magnetic material such as Mn-Zn ferrite or Ni-Zn ferrite. The ferrite substrate 10 has a length of about 30 mm and a width of about 2.5 mm.
It is said. As described later, a plurality of magnetic core halves 2A are formed on the ferrite substrate 10 in parallel. Thereafter, by abutting the pair of ferrite substrates 10, a plurality of magnetic heads 1 are formed in parallel. Thereafter, the plurality of magnetic heads 1 formed in parallel are cut and separated into individual magnetic heads 1.

Next, as shown in FIG. 3, a plurality of track width regulating grooves 7A, 7A are formed on one main surface 10A of the ferrite substrate 10 in a direction parallel to the width direction of the ferrite substrate 10.
B is formed at a constant pitch. This track width regulating groove 7
A and 7B have a depth dimension of about 160 μm. Each of the track width regulating grooves 7A and 7B has an inclined surface on one side, and an inclination angle (indicated by β in FIG. 3) of 8 to 45 degrees.

At this time, a convex portion 11 having a predetermined width is formed between the track width regulating groove 7A and the track width regulating groove 7B. The width of the protrusion 11 is the width of the track width of the magnetic head 1. The track width regulating grooves 7A and 7B form a convex portion 11 corresponding to one magnetic head 1, and are formed sufficiently apart from the track width regulating grooves 7A and 7B of the magnetic head formed adjacently. Have been. Here, the track width regulating grooves 7A and 7B are not limited to the cross-sectional shapes of the grooves, but may be any shapes that define the track width of the magnetic head 1.
However, it is preferable that the track width regulating grooves 7A and 7B do not have a plane parallel to the one main surface 10A. This is because, in the magnetic head 1, there is a possibility that a surface parallel to the one main surface 10A may form a pseudo gap.

After the track width regulating grooves 7A and 7B are formed in the ferrite substrate 10 as described above, the one main surface 10A is polished to flatten the one main surface 10A. At this time, the one main surface 10A is polished so that its surface roughness (Ra) is about 200 to 1000 Å.

Next, as shown in FIG. 4, one of the main surfaces 10A of the ferrite substrate 10 has
A gap depth regulating groove 1 in a direction perpendicular to A and 7B.
Form 2 The gap depth regulating groove 12 regulates the size of the gap depth and winds the coil. Then, the one main surface 10A of the ferrite substrate 10 is subjected to so-called reverse sputtering to reduce the surface roughness of the one main surface 10A. The ferrite substrate 10 on which the plurality of magnetic core halves are formed is referred to as a magnetic core half block 13.

Next, a non-magnetic material such as T is formed on one main surface 10A of the magnetic core half-block 13 by sputtering.
the formation of the a ₂ O ₅ film. This Ta ₂ O ₅ film has a thickness of about 850 Å and serves as the gap film 4 in the magnetic head 1 as described above.

Next, as shown in FIG. 5, the pair of magnetic core half-blocks 13 are butted so that the surfaces on which the Ta ₂ O ₅ films are formed face each other. At this time, the pair of magnetic core half-blocks 13 are accurately aligned with the track width regulating grooves 7A, 7B formed as described above, and the protrusions 11 formed on each magnetic core half-block 10 are formed.
Are opposed to each other.

At this time, a pair of magnetic core half blocks 1
In order to join 3, a nonmagnetic insulating material such as a low-melting glass material is filled in the track width regulating grooves 7 </ b> A and 7 </ b> B. As the low melting point glass material, a substantially cylindrical glass lot 14 having a wire diameter of 0.1 mm is used. The glass lot 14 is arranged at an end of the gap depth regulating groove 12 on the magnetic gap side in parallel with the gap depth regulating groove 14.
In this state, the viscosity of the low melting point glass material is 0.48 to 0.6.
(Pa · s), and the temperature is maintained for about 1 hour to fill the track width regulating grooves 7A and 7B with a low melting point glass material as shown in FIG. Thereafter, by cooling the pair of core half-blocks 13 filled with the low-melting glass material, the low-melting glass material is solidified to become the glass portion 5 and the pair of core half-blocks 13 is fused.

Next, cylindrical processing is performed on one side surface D of the pair of magnetic core half blocks 13 fused with the low melting point glass material. The one side surface D is a surface that becomes the medium sliding surface A of the magnetic head 1 and is a surface where the gap film 4 is exposed. And this one side D is formed by cylindrical processing.
It is processed so that the portion where the gap film 4 is exposed is the highest position.

Next, grinding is performed on one side face D of the pair of magnetic core half-blocks 13 that have been fused. Thereby, a contact width regulating groove in the magnetic head 1 is formed.
At this time, the grinding process is performed on a portion sandwiched between the solid line L1-L1 and the dotted line S1-S1 and a portion sandwiched between the solid line L2-L2 and the dotted line S2-S2 in FIG.

At this time, as shown in FIG.
1 will be formed. The convex portion 11 is a portion that becomes the medium sliding surface A in the magnetic head 1. And
In this method, when forming the hit width regulating groove 6, the glass portion 5 filled in the track width regulating grooves 7A and 7B is almost not ground.

Next, the pair of fused core half blocks 13 is cut at positions indicated by solid lines L1-L1 and L2-L2 in FIG. Thereby, the pair of fused magnetic core half blocks 13 is separated into the individual magnetic heads 1.

The recording / reproducing characteristics of the magnetic head 1 manufactured as described above were compared with those of a conventional magnetic head. Table 1 shows the results.

[0048]

[Table 1]

As is apparent from Table 1, the magnetic head according to the present invention achieves an improvement in output as compared with the conventional one. At this time, the magnetic 1 head according to the present invention has a vertical length of 1.9 mm,
The one having a horizontal length of 1.5 mm and a track width of 15 μm was used. Also,
In the magnetic head 1, the angle β of the inclined surfaces of the track width regulating grooves 7A and 7B is 30 °, and the azimuth angle is 20 °.

As described above, in the magnetic head and the method of manufacturing the same according to the present invention, the track width regulating grooves 7A and 7B are located inside the core width of the magnetic head 1. Therefore, in this method, when cutting the magnetic core half block at the positions indicated by the solid lines L1-L1 and L2-L2 in FIG. 6, the glass portion 5 filled in the track width regulating grooves 7A and 7B is cut. Never cut. That is, in this method,
When separating the individual magnetic heads 1, only the magnetic material constituting the magnetic core needs to be cut.

As described above, in the magnetic head manufacturing method according to the present invention, in the cutting process, only the magnetic material having a lower cutting rate than the low melting point glass material is cut, so that the magnetic material may be distorted. Absent. Therefore, in the magnetic head and the method of manufacturing the same according to the present invention, the magnetic material forming the magnetic core has good magnetic performance. Therefore, in this magnetic head, the magnetic material constituting the magnetic core is a magnetic head having a high magnetic permeability, and the recording and reproducing characteristics are improved.

In the above-described magnetic head and the method of manufacturing the same according to the present invention, the track width regulating groove 7 is preferably used.
A and 7B are exposed only on the medium sliding surface A regulated by the contact width regulating groove 6. At this time, in this method, when the contact width regulating groove 6 is formed by grinding, it is not necessary to grind the glass portion 5 filled in the track width regulating grooves 7A and 7B. That is, in this case, the grinding is performed only on the magnetic material constituting the magnetic core.

As described above, in the magnetic head and the method of manufacturing the same according to the present invention, since only the magnetic material having a lower grinding rate than the glass material is ground in the grinding process, no distortion occurs in the magnetic material. . Therefore, in this case,
According to the magnetic head and the method of manufacturing the same, the magnetic material constituting the magnetic core has a better magnetic performance. Therefore, in this magnetic head, the magnetic material constituting the magnetic core is a magnetic head having a higher magnetic permeability, and the recording and reproducing characteristics are further improved.

Here, the following experiment was conducted in order to verify that the magnetic material was not distorted by the above-described grinding or cutting.

In this experiment, first, 35 mm × 2.5 m
A film of Ta ₂ O _{5 is formed} to a thickness of 850 angstroms on a ferrite substrate of mx 1 mm, and a low-melting glass material is formed thereon by sputtering.

At this time, a sample 1 in which a low melting point glass material was formed on the entire surface of the ferrite substrate was used. For comparison, a sample 2 was prepared by subjecting the upper surface of the ferrite substrate to a mask treatment so that the low-melting glass was formed on the upper surface of the ferrite substrate at intervals of 200 μm. Then, the sample 1 and the sample 2 are subjected to a heat treatment at 530 ° C. for 1 hour under the same conditions as in the fusion step.

Sample 1 and Sample 2 formed as described above
Was subjected to grinding using a grindstone (abrasive grains: artificial diamond, particle size: 3 to 8 μm) having a width dimension of 200 μm. This grinding is performed on the surface of each sample at intervals of 200 μm.
This was done by grinding 60 grooves with a depth dimension of μm.

That is, in this sample, the ferrite substrate and the low melting point glass material are simultaneously ground in the sample 1. On the other hand, in the sample 2, almost only the ferrite substrate is ground.

The experimental results at this time are shown in FIGS. FIG. 8 is a characteristic diagram showing the warpage of each sample before grinding. (A) shows the warpage of Sample 1 and (B) shows the warpage of Sample 2. And FIG.
FIG. 4 is a characteristic diagram illustrating warpage of each sample after grinding. (A) shows the warpage of Sample 1, and (B) shows the warpage of Sample 2. As is clear from FIGS. 8 and 9, it is understood that the sample 1 has a large warpage. On the other hand, it can be seen that the sample 2 hardly warps.

That is, when the ferrite substrate and the low-melting glass material are simultaneously ground, a large warp is generated in the entire substrate. On the other hand, when grinding is performed on almost only the ferrite substrate,
Almost no warpage has occurred.

The warpage generated in the sample 1 is a phenomenon as a result of releasing the strain inside the ferrite caused by the grinding. That is, in the sample 1, the strain generated in the portion made of the low melting point glass material having a high grinding rate is added to the portion made of ferrite, and as a result, the strain is transmitted to the ferrite substrate. Then, in the ferrite substrate, as shown in FIG. 9, warpage occurs in order to release the transmitted distortion.

From the above experimental results, in the magnetic head 1, there is no occurrence of distortion due to grinding and cutting.

Further, according to the method of manufacturing a magnetic head according to the present invention described above, the shape of the track width regulating grooves 7A and 7B is reduced as described above. This allows
According to this method, the amount of the low-melting glass material filled in the track width regulating grooves 7A and 7B can be reduced as compared with the conventional method. Therefore, according to this method, it is possible to reduce the cost required for a glass part such as a low-melting glass material.

Further, in the above-described magnetic head according to the present invention, the method of joining the medium sliding surface and the magnetic core is the same as that of the conventional magnetic head. Therefore, in the magnetic head according to the present invention, its sliding characteristics and bonding strength do not decrease as compared with the conventional one.

[0065]

As described in detail above, according to the magnetic head and the method of manufacturing the same according to the present invention, it is necessary to grind and cut the glass portion filled in the track width regulating groove. Absent. That is, the grinding process and the cutting process need only be performed on the magnetic material constituting the magnetic core. Thus, in the magnetic head and the method of manufacturing the same, no distortion occurs in the magnetic material constituting the magnetic core. Therefore, in the magnetic head and the method of manufacturing the same, the magnetic performance of the magnetic body is maintained at a high level. In the magnetic head and the method of manufacturing the same, particularly, since the magnetic material has good magnetic permeability, the recording / reproducing characteristics are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a magnetic head according to the present invention.

FIG. FIG. 4 is a perspective view of a ferrite substrate for describing a method of manufacturing a magnetic head according to the present invention.

FIG. 3 is a perspective view of a ferrite substrate for explaining a method of manufacturing a magnetic head according to the present invention.

FIG. 4 is a perspective view of a ferrite substrate for explaining a method of manufacturing a magnetic head according to the present invention.

FIG. 5 is a perspective view of a pair of ferrite substrates for describing a method of manufacturing a magnetic head according to the present invention.

FIG. 6 is a perspective view of a pair of ferrite substrates for describing a method of manufacturing a magnetic head according to the present invention.

FIG. 7 is a plan view of a main part of a pair of ferrite substrates for describing a method of manufacturing a magnetic head according to the present invention.

8A and 8B are characteristic diagrams showing warpage occurring in a ferrite substrate before being subjected to grinding, and FIG. 8A is a characteristic diagram in the case of a ferrite substrate in which a low-melting glass material is formed on the entire surface; (B) is a characteristic diagram in the case of a ferrite substrate on which a low-melting glass material is formed at 200 μm intervals.

9A and 9B are characteristic diagrams showing warpage generated in a ferrite substrate after being subjected to grinding, and FIG. 9A is a characteristic diagram in the case of a ferrite substrate in which a low-melting glass material is formed on the entire surface; (B) is a characteristic diagram in the case of a ferrite substrate on which a low-melting glass material is formed at 200 μm intervals.

FIG. 10 is a perspective view of a main part of a conventional magnetic head.

FIG. 11 is a perspective view of a pair of ferrite substrates for describing a conventional method of manufacturing a magnetic head.

[Explanation of symbols]

1 magnetic head, 2 magnetic core halves, 4 gap films,
Reference Signs List 5 glass part, 6 contact width regulating groove, 7 track width regulating groove, 8 gap depth regulating groove, 10 ferrite substrate, 11 convex part, 12 gap depth regulating groove, 13
Core half block

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[Procedure amendment]

[Submission date] December 9, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0059

[Correction method] Change

[Correction contents]

The experimental results at this time are shown in FIGS. FIG. 9 is a characteristic diagram showing warpage of each sample before grinding. (A) shows the warpage of Sample 1 and (B) shows the warpage of Sample 2. And FIG.
FIG. 4 is a characteristic diagram illustrating warpage of each sample after grinding. (A) shows the warpage of Sample 1, and (B) shows the warpage of Sample 2. As is clear from FIGS. 8 and 9, it is understood that the sample 1 has a large warpage. On the other hand, it can be seen that the sample 2 hardly warps.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction contents]

The warpage generated in the sample 1 is a phenomenon as a result of releasing the strain inside the ferrite caused by the grinding. That is, in the sample 1, the strain generated in the portion made of the low melting point glass material having a high grinding rate is added to the portion made of ferrite, and as a result, the strain is transmitted to the ferrite substrate. Then, in the ferrite substrate, in order to release the transmitted distortion, warpage occurs as shown in FIG.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

8A and 8B are characteristic diagrams showing warpage generated in a ferrite substrate after being subjected to grinding, and FIG. 8A is a characteristic diagram in the case of a ferrite substrate in which a low-melting glass material is formed on the entire surface; (B) is a characteristic diagram in the case of a ferrite substrate on which a low-melting glass material is formed at 200 μm intervals.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

9A and 9B are characteristic diagrams showing warpage generated in a ferrite substrate before being subjected to grinding, and FIG. 9A is a characteristic diagram in the case of a ferrite substrate in which a low-melting glass material is formed on the entire surface; (B) is a characteristic diagram in the case of a ferrite substrate on which a low-melting glass material is formed at 200 μm intervals.

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

Claims (4)

[Claims] 1. A pair of magnetic core halves made of a magnetic material are abutted via a non-magnetic material to form a magnetic gap, and a track width regulating groove is formed in each of the magnetic core halves by grinding. The track width of the magnetic gap is regulated by filling the track width regulating groove with a nonmagnetic material, and the grinding area in the track width direction of the track width regulating groove is within the width of the magnetic core half, A magnetic head, wherein a track width regulating groove is not exposed on a side surface of the magnetic core half. 2. A contact width regulating groove for regulating a contact width with respect to a magnetic recording medium is formed in the magnetic core half, and an outer end of the track width regulating groove coincides with a side edge of the contact width regulating groove. 2. The magnetic head according to claim 1, wherein the magnetic head is located at or beyond the position. 3. A pair of magnetic core halves made of a magnetic material,
A step of grinding and forming a track width regulating groove having a predetermined interval, and forming a magnetic gap by abutting a pair of magnetic core halves via a non-magnetic material, and filling the track width regulating groove with a non-magnetic material. Joining the pair of magnetic core halves, wherein the grinding area in the track width direction of the track width regulating groove is within the width of the magnetic core half, and the track width regulating groove is a side surface of the magnetic core half. A method for manufacturing a magnetic head, wherein the magnetic head is not exposed to light. 4. A step of forming a contact width regulating groove for regulating a contact width with respect to a magnetic recording medium in the magnetic core half after the magnetic core half is joined, wherein an outer end of the track width regulating groove is provided. 4. The method of manufacturing a magnetic head according to claim 3, wherein the portion is located at a position which coincides with or exceeds the side edge of the contact width regulating groove.