JPH11213320A - Magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the yield in the cutting process for chip making. SOLUTION: A magnetic core consisting of a magnetic material is included in which a pair of core half bodies 21 and 22 are so butted and joined that a gap 23 may be constituted in one end on the slide surface side to be brought into contact with a magnetic recording medium and winding windows 21a and 22a may be formed below the gap 23, and the gap 23 is controlled to have a prescribed track width Tw by track control grooves 24 and 25 which are provided in both side edges of the magnetic core and are extended obliquely to side edges on the contact surface. Further, a step is formed in an area between winding windows 21a and 22a in joint surfaces of core half bodies 21 and 22 and the slide surface, and a high permeability and magnetic flux density film 26 is formed in this step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording and reproducing data on a magnetic recording medium such as a magnetic tape for recording and reproducing data on a video tape recorder (VTR), a digital audio tape recorder (DAT) or a computer. In particular, the present invention relates to a so-called helical scan type magnetic head.

[0002]

2. Description of the Related Art Conventionally, such a magnetic head is configured as shown in FIG. In FIG. 15, the magnetic head 1 includes a magnetic core composed of two core halves 2 and 3 joined to each other.

The core halves 2 and 3 are each made of a magnetic material such as ferrite. A gap 4 is formed on at least a so-called gap forming surface of the magnetic core which is closer to the surface (contact surface with the magnetic recording medium). Each of the core halves 2 and 3 has, on the joint surface side thereof, a winding groove 2 a or 3 a for receiving a winding wound as a coil and restricting the depth of the gap 4. A coil (not shown) is wound around at least one of the core halves 2 or 3, for example, the core half 2, through a winding window formed by the winding grooves 2 a and 3 a.

Here, the gap 4 has a predetermined track width Tw in the track width direction.
It is regulated by track width regulating grooves 5 and 6 formed on the side edges of the core halves 2 and 3. The track width regulating grooves 5 and 6 are formed in an arc shape from both end edges of the gap 4 in the depth direction.

Further, as shown in FIG. 15, each of the core halves 2, 3 has a high magnetic permeability and a high magnetic flux density on its gap forming surface, the winding grooves 2a, 3a and the inner surfaces of the track width regulating grooves 5, 6. A metal magnetic film 7 and a gap film 8 are provided as films. In the case shown, each of the core halves 2 and 3 has a winding groove 2a,
After the formation of the groove 3a and the track width regulating grooves 5, 6, the gap forming surface, the winding grooves 2a, 3a and the track width regulating grooves 5, 6
Metal magnetic films 7 and 8 are formed on the inner surface of the substrate, and then the bonding glass 9 is sealed in the track width regulating grooves 5 and 6 so that the core halves 2 and 3 are joined to each other. .

In the magnetic head 1 shown in FIG. 15, the contact width regulating grooves 1b and 1c for regulating the contact width of the sliding surface 1a for the magnetic recording medium are formed at both ends of the gap 4. Are formed so as to sandwich them.

According to the magnetic head 1 configured as described above, at the time of recording, for example, a magnetic tape (not shown) slides along the sliding surface 1a of the magnetic head 1 in the direction of arrow T, and the magnetic tape from the outside. When a drive current is introduced into the coil wound around the core half 2 of the head 1, a magnetic field corresponding to the drive current is generated in the coil. Then, the magnetic field generated in the coil circulates around the winding grooves 2a and 3a of the core halves 2 and 3 as a magnetic path and passes through the gap 4, so that desired data is Magnetic recording is performed. During reproduction, a magnetic field circulating through the core halves 2 and 3 is generated from the gap 4 based on a magnetic signal recorded on the sliding magnetic tape, and a signal current is generated in the coil based on the magnetic field. . Then, the signal current generated in the coil is taken out to the outside and appropriately processed, so that the data recorded on the magnetic tape is reproduced.

[0008]

By the way, the magnetic head 1 having such a structure is manufactured as follows in manufacturing. First, as shown in FIG. 16, a pair of plate-like substrates 10 made of, for example, ferrite receive coil windings and regulate the gap depth along the longitudinal direction of the upper surface (main surface) 10a. Winding groove 11 (2
a, 3a) are formed. Subsequently, as shown in FIG. 17, the track width regulating grooves 12 (5, 6) are formed on the substrate 10 so that a ferrite section having a track width Tw remains in the width direction of the upper surface (main surface). You. Here, substrate 1
0 main surface 10a, winding groove 11, and track width regulating groove 1
As shown in FIG. 17, a metal magnetic film 13 as a high magnetic permeability / magnetic flux density film is formed on the inner surface of the substrate 2. Further, a gap film 14 having a thickness of about half the specified gap length is formed at least in the area of the abutting surface where the gap 4 is formed. That is, the metal magnetic film 13 is provided on the entire bonding surface of the substrates 10.

The pair of substrates 10 configured as described above is
As shown in FIG. 18, as two core half blocks,
After the layers are overlapped so that the main surfaces are in contact with each other via the gap spacer and are track-aligned, the bonding glass 15 is filled in the track width regulating groove 12 and the two substrates 10 are bonded to each other. Thereafter, as shown in FIG. 19, the surface in contact with the magnetic tape is cylindrically ground, and the sliding surface 16 (1
a) is formed, and a contact width regulating groove 17 (1) is formed in a region of the sliding surface 16 between the track width regulating grooves 12.
b, 1c) are formed. Finally, the magnetic head 1 shown in FIG. 15 is completed by cutting, for example, by slicing each track width regulating groove 12 in the longitudinal direction so as to have a predetermined chip thickness and a predetermined chip length.

However, in the magnetic head 1 having such a configuration, the metal magnetic material extends over the entire joint surfaces of the core halves 2 and 3 and the entire inner surfaces of the winding grooves 2a and 3a and the track width regulating grooves 5 and 6. A film 13 is formed. For this reason, when a magnetic head is chipped by cutting from a core block in which a pair of core half blocks are joined to each other,
A cutting whetstone (not shown) is provided on the metal magnetic film 1 together with a substrate 10 made of ferrite constituting a core half block.
3 is cut, and the processing area of the metal magnetic film 13 is relatively large. Therefore, when the metal magnetic film 13 is cut, the cutting grindstone is damaged, and the chip of the cut magnetic head 1 is partially damaged by the damage of the cutting grindstone. Therefore, there is a problem that the yield of the magnetic head 1 is reduced. Further, when the contact width regulating groove 17 is processed, the metal magnetic film 13 is also processed, so that the processing whetstone is similarly damaged.

On the other hand, there is a method in which the track width regulating groove 12 is formed after the metal magnetic film 13 is formed. In this case, when the track width regulating groove 12 is processed, the metal magnetic film 13 is formed. Since the machining wheel 13 is machined, the machining wheel is damaged, and the damage of the machining wheel increases wear. Therefore, there is a problem that the processing accuracy of the track width regulating groove 12 is reduced, and the processing stability of the track width regulating groove is impaired.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a magnetic head capable of improving a yield in a cutting process for forming a chip.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a gap is formed at one end of a sliding surface to be brought into contact with a magnetic recording medium, and a winding window is formed below the gap. A magnetic core composed of a magnetic material, in which a pair of core halves are joined to each other by abutting each other,
The gap is regulated by a track width regulating groove provided on both side edges of the magnetic core so as to have a predetermined track width, and the winding window and the sliding surface of the joint surface of each core half are formed. This is achieved by a magnetic head in which a step is formed in a region between the steps and a high permeability / magnetic flux density film is formed in the step.

According to the above construction, the high magnetic permeability / magnetic flux density film is formed in the step formed in the region between the winding window and the sliding surface on the joint surface of each core half. Therefore, it is not formed on the whole of these joining surfaces. For this reason, after a plurality of magnetic heads are continuously and integrally formed as a core block in the width direction, when each magnetic head is cut and processed for chipping, the cutting whetstone is used for each core half. The high magnetic permeability / magnetic flux density film formed only in the region near the sliding surface of the joining surface of (1) is cut.

Therefore, compared to a conventional magnetic head in which a high magnetic permeability / magnetic flux density film is formed on the entire bonding surface, the cutting area of the high magnetic permeability / magnetic flux density film to be cut by the cutting grindstone is smaller. It will be greatly reduced. Thereby, the cutting grindstone greatly reduces damage caused by the cutting of the high magnetic permeability / magnetic flux density film in the cutting for forming the magnetic head into chips.

If the high magnetic permeability / magnetic flux density film is formed only in the step formed on the joint surface of each core half, the high magnetic permeability / magnetic flux density is formed on the inner surface of the track width regulating groove. No film is formed. Therefore, when machining the groove for restricting the contact width of the sliding surface of the magnetic recording medium of the magnetic head, it is not necessary to process the high magnetic permeability and magnetic flux density film with the processing grindstone. -Damage received by processing the magnetic flux density film is completely eliminated.

When the high magnetic permeability / magnetic flux density film is also formed in the track width regulating groove, a step is formed in the joint surface of each core half from the winding groove to the sliding surface region. Forming
By forming a high magnetic permeability and magnetic flux density film in this step, a magnetic head is manufactured almost in the same manner as in the related art,
The high magnetic permeability / magnetic flux density film is easily formed only in a part of the joint surface of the core half.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are added. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 shows a first embodiment of a magnetic head according to the present invention. FIG. 1A is a perspective view of the magnetic head, and FIG. It is the partial plan view shown. In FIG. 1, the magnetic head 20 is
It includes a magnetic core consisting of two core halves 21 and 22 joined together.

Each of the core halves 21 and 22 is made of a magnetic material such as ferrite, and has a so-called gap forming surface at least closer to the surface (the contact surface with the magnetic recording medium) among the joining surfaces to be joined to each other. However, a gap 23 is formed therebetween. Each of the core halves 21 and 22 has, on its joint surface, winding grooves 21 a and 22 a for receiving a winding wound as a coil and restricting the depth of the gap 23.
A coil (not shown) is wound around at least one of the core halves 21 or 22, for example, the core half 21, through a winding window formed by the winding grooves 21a and 22a.

Here, the gap 23 is formed as shown in FIG.
As shown in the figure, the width is regulated by the track width regulating grooves 24, 25 formed on the side edges of the core halves 21, 22 so as to have a predetermined track width Tw in the track width direction. The track width regulating grooves 24 and 25 are formed in an arc shape from both end edges of the gap 23 in the depth direction.

Further, each of the core halves 21 and 22 is provided with a metal magnetic film 26 and a gap film 27 as a high magnetic permeability and magnetic flux density film on the gap forming surface. In the case shown in the figure, each of the core halves 21 and 22 is provided with a metal magnetic film 26 and a gap film 27 on the gap forming surface after the formation of the winding grooves 21a and 22a and the track width regulating grooves 24 and 25 as described later. Formed, and then the track width regulating grooves 24, 25
The core halves 21 and 22 are bonded to each other by enclosing the bonding glass 28 therein.

In the magnetic head 20 shown in FIG. 1, a sliding surface (contact surface) 30a for the magnetic recording medium is provided.
Contact width regulating grooves 30b, 3 for regulating the contact width
0c are formed so as to sandwich both end edges of the gap 23.

As will be described later, the winding windows 21a, 22a are provided on the joining surfaces of the core halves 21, 22.
Steps 30b, 30b having a depth substantially equal to the thickness of the metal magnetic film 26 are formed in a region between the metal layer 26 and the sliding surface 10a, and high magnetic permeability and magnetic flux density are formed in the steps (on the steps). A metal magnetic film 26 is formed as a film.

The magnetic head 20 having such a configuration is manufactured as described below. First, as shown in FIG. 2, an upper surface (principal surface) of a pair of plate-like substrates 30 made of a magnetic material such as ferrite is provided.
Along the longitudinal direction of 30a, 30a, winding grooves 31, for receiving coil windings and regulating the depth of the gap.
31 (21a, 22a) are formed, and steps 30b, 30b are formed on each main surface 30a in a region between the winding grooves 31, 31 and an end surface to be a sliding surface of the magnetic recording medium. Have been. The depth d of each step 30b is selected to be substantially equal to the thickness of a metal magnetic film described later.

Subsequently, as shown in FIG. 3, the substrate 30, 30 has two track width regulating grooves 32, 32 () so that a ferrite section having a track width Tw remains in the width direction of the main surface 30a. 24, 25) are formed. here,
Step 3 formed on each main surface 30a of each substrate 30
As shown in FIG. 3, metal magnetic films 33, 33 each serving as a high magnetic permeability / magnetic flux density film are formed in the region 0 b (the shaded region in FIG. 3).
33, and a gap film 34 having a thickness of about half the specified gap length is formed.

The pair of substrates 30 and 3 configured as described above
0 are aligned as shown by the arrows in FIG. 3 and, as shown in FIG. 4, after being overlapped as two core half blocks via a gap spacer so that the main surfaces are in contact with each other and track-aligned. The joining glass 35 is filled in the track width regulating groove 32, and the two substrates 30 are joined to each other.

Thereafter, as shown in FIG. 5, the surface in contact with the magnetic recording medium is cylindrically ground, and the sliding surface 36 (30a) is ground.
Is formed, and a contact width regulating groove 37 (30b, 30b, 30b) is formed in a region of the sliding surface 36 between the track width regulating grooves 32.
30c) is formed.

Finally, the magnetic head 20 shown in FIG. 1 is completed by cutting, for example, by slicing each track width regulating groove 32 in the longitudinal direction so as to have a predetermined chip thickness and a predetermined chip length. I do.

The magnetic head 20 according to the present embodiment is constructed as described above. At the time of recording, a magnetic tape (not shown) slides along the sliding surface 20a of the magnetic head 20, and the magnetic head 20 When a drive current is introduced into a coil (not shown) wound around the core half 21 of the device 20, a magnetic field corresponding to the drive current is generated in the coil. And the magnetic field generated in this coil is
By circulating around the winding grooves 21a and 22a of the core halves 21 and 22 as a magnetic path and passing through the gap 23,
Magnetic recording of desired data is performed on the magnetic tape.

At the time of reproduction, a magnetic field circulating through the core halves 21 and 22 is generated from the gap 23 based on a magnetic signal recorded on the sliding magnetic tape, and a signal current is applied to the coil based on the magnetic field. Occurs. Then, the signal current generated in the coil is taken out to the outside and appropriately processed, so that the data recorded on the magnetic tape is reproduced.

Here, the magnetic head 20 according to the present embodiment
In the above, the processing of the contact width regulating groove 37 is performed by using, for example, a processing grindstone.
Since the metal magnetic film 33 does not exist in the processing region 7, the processing grindstone does not process the metal magnetic film 33. For this reason, the damage caused by the metal magnetic film 33 of the grinding wheel for processing is completely eliminated.

Further, the cutting process for each chip of the magnetic head 20 is performed by a cutting grindstone. On the cut processing surface, the metal magnetic film 33 has step portions 30b, 3b.
Since it exists only in the region of 0b, the cutting area of the metal magnetic film 33 is greatly reduced as compared with the case of the conventional magnetic head 1 shown in FIG. For this reason, the cutting grindstone greatly reduces the damage caused by the cutting of the metal magnetic film 33 in the cutting for forming the magnetic head 20 into chips. Thus, chip breakage of the magnetic head 20 during cutting by the cutting grindstone is reduced, and the yield of the magnetic head 20 is improved.

FIG. 7 shows a second embodiment of the magnetic head according to the present invention. In FIG. 7, the magnetic head 40
Has substantially the same configuration as the magnetic head 20 shown in FIG. 1, and has a width regulating groove 30b, 30c which hits the sliding surface 30a.
Is different only in that no is formed.
According to the magnetic head 40 having such a configuration, it operates similarly to the magnetic head 20, and when the magnetic head 40 is cut for each chip, the metal magnetic film 33 is located above the winding groove 31. Since only the magnetic head 33 exists, the cutting area of the metal magnetic film 33 is greatly reduced as compared with the case of the conventional magnetic head 1. For this reason, the cutting grindstone greatly reduces the damage received by the cutting process of the metal magnetic film 33 in the cutting process for forming the magnetic head 40 into chips. Thus, chip breakage of the magnetic head 40 in the cutting process using the cutting grindstone is reduced, and the yield of the magnetic head 40 is improved.

FIG. 8 shows a third embodiment of the magnetic head according to the present invention. In FIG. 8, the magnetic head 50
Includes a magnetic core consisting of two core halves 51 and 52 joined together.

Each of the core halves 51 and 52 is made of a magnetic material such as ferrite, and has a so-called gap forming surface at least closer to the surface (contact surface with the magnetic recording medium) among the joining surfaces to be joined to each other. However, a gap 53 is formed therebetween. Each of the core halves 51 and 52 has, on its joint surface, a winding groove 51a or 52a for receiving a winding wound as a coil and restricting the depth of the gap 53.
A coil (not shown) is wound around at least one of the core halves 51 or 52, for example, the core half 51, through a winding window formed by the winding grooves 51a and 52a.

Here, the gap 53 is regulated by track width regulating grooves 54, 55 formed on the side edges of the core halves 51, 52 so as to have a predetermined track width Tw in the track width direction. ing. The track width regulating grooves 54 and 55 are formed in an arc shape from both end edges of the gap 53 in the depth direction, respectively.

Further, each of the core halves 51 and 52 has a metal magnetic film 56 and a gap film 57 as a high magnetic permeability and magnetic flux density film on the gap forming surface. In the case shown in the figure, the core halves 51 and 52 are formed with the gap forming surfaces and the track width regulating grooves 54 and 55 after the winding grooves 51a and 52a and the track width regulating grooves 54 and 55 are formed, as described later.
Metal magnetic films 56 and 57 are formed therein, and then the bonding glass 58 is sealed in the track width regulating grooves 54 and 55 so that the core halves 51 and 52 are joined to each other.

In the magnetic head 50 shown in FIG. 8, the contact width regulating grooves 50b and 50c for regulating the contact width of the sliding surface 50a for the magnetic recording medium are formed at both ends of the gap 53. Are formed so as to sandwich them.

In the magnetic head 50, the metal magnetic film 56 is configured as follows. That is, a depth substantially equal to the thickness of the metal magnetic film 56 is provided on the joining surface (opposing surface) of each of the core halves 51 and 52, in the region between the winding windows 51a and 52a and the sliding surface 50a. Is formed, and the joint surface has a high magnetic permeability and
A metal magnetic film 56 as a magnetic flux density film is formed.

The magnetic head 50 having such a configuration is manufactured as described below. First, as shown in FIG. 9, a pair of plate-like substrates 60 made of, for example, ferrite receive coil windings and regulate the gap depth along the longitudinal direction of the upper surface (main surface) 60a. Is formed, and a step 60b is formed on the main surface 60a in a region between the winding groove 61 and an end surface to be a sliding surface of the magnetic recording medium. ing. The depth d of the step 60b is selected to be substantially equal to the thickness of a metal magnetic film described later.

Here, as shown in FIG. 10, a high magnetic permeability is formed in an area (area indicated by oblique lines in FIG. 10) within the step 60b and the inner surface of the winding groove 61 formed on the main surface 60a of each substrate 60.・
A metal magnetic film 63 is formed as a magnetic flux density film, and a gap film 64 having a thickness of about half the specified gap length is further formed thereon. Subsequently, this substrate 60 is
As shown in the figure, the track width T in the width direction of the main surface 60a.
The track width regulating grooves 62, 62 (54, 55) are formed such that the ferrite cross section w is left.

The pair of substrates 60 thus configured is
As shown in FIG. 11, as two core half blocks,
After the layers are overlapped so that their main surfaces are in contact with each other via a gap spacer and are track-aligned, the bonding glass 65 is filled in the track width regulating groove 62, and the two substrates 60 are bonded to each other.

Thereafter, as shown in FIG. 12, the surface in contact with the magnetic recording medium is cylindrically ground, and the sliding surface 66 (50) is ground.
a) is formed and a contact width regulating groove 67 (50) is formed in a region of the sliding surface 66 between the track width regulating grooves 62.
b, 50c) are formed.

Finally, the magnetic head 50 shown in FIG. 8 is completed by cutting, for example, by slicing each track width regulating groove 62 in the longitudinal direction so as to have a predetermined chip thickness and a predetermined chip length. I do.

According to the magnetic head 50 having such a configuration, at the time of recording, a magnetic tape (not shown) slides along the sliding surface 50a of the magnetic head 50 and the core half 51 of the magnetic head 50 is externally provided. When a drive current is introduced into a coil (not shown) wound around the coil, a magnetic field corresponding to the drive current is generated in the coil. The magnetic field generated in this coil is applied to the core halves 51 and 52.
The magnetic flux circulates around the winding grooves 51a, 52a as a magnetic path and passes through the gap 53, whereby magnetic recording of desired data is performed on the magnetic tape.

At the time of reproduction, a magnetic field circulating through the core halves 51 and 52 from the gap 53 is generated based on a magnetic signal recorded on the sliding magnetic tape, and a signal current is applied to the coil based on the magnetic field. Occurs. Then, the signal current generated in the coil is taken out to the outside and appropriately processed, so that the data recorded on the magnetic tape is reproduced.

Here, the magnetic head 50 according to the present embodiment is used.
In the cutting process for each chip of the magnetic head 50,
The cutting is performed by a grinding wheel. On the cutting surface, the metal magnetic film 63 is present only in a region above the winding groove 61, so that it is compared with the case of the conventional magnetic head 1 shown in FIG. As a result, the cutting area of the metal magnetic film 63 is greatly reduced. For this reason, the cutting grindstone greatly reduces damage caused by the cutting of the metal magnetic film 63 in the cutting for forming the magnetic head 50 into chips. In this manner, chip breakage of the magnetic head 50 during cutting by the cutting grindstone is reduced, and the yield of the magnetic head 50 is improved.

FIG. 14 shows a fourth embodiment of the magnetic head according to the present invention. In FIG. 14, a magnetic head 70 has substantially the same configuration as the magnetic head 50 shown in FIG.
The configuration is different only in that 0c is not formed. According to the magnetic head 70 having such a configuration, the metal magnetic film 63 operates in the same manner as the magnetic head 50, and when the magnetic head 50 is cut for each chip, the metal magnetic film 63 is formed by the winding groove 6
Since it exists only in the region above the first magnetic head 1, the cut area of the metal magnetic film 63 is greatly reduced as compared with the case of the conventional magnetic head 1. For this reason, the cutting grindstone greatly reduces the damage received by the cutting process of the metal magnetic film 63 in the cutting process for forming the magnetic head 70 into chips. In this manner, chip breakage of the magnetic head 70 during cutting by the cutting grindstone is reduced, and the yield of the magnetic head 70 is improved.

In the embodiment described above, the track width regulating grooves 32, 62 are formed before the metal magnetic films 33, 63 are formed. However, the present invention is not limited to this.
The metal magnetic films 33, 63 are formed on the main surfaces 30a of the substrates 30, 60,
60a, the track width regulating grooves 32, 62 are formed.
Obviously, may be formed.

In the above-described embodiment, the gaps 23 and 53 have the azimuth angle.
Although 50 has been described, the present invention is not limited to this, and it is apparent that the present invention can be applied to a magnetic head having an azimuth angle of 0 degree.

[0052]

As described above, according to the present invention, it is possible to provide a magnetic head capable of improving the yield in the cutting process for forming a chip.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an overall configuration of a first embodiment of a magnetic head according to the present invention.

FIG. 2 is a schematic perspective view showing a first step in a manufacturing process of the magnetic head of FIG.

FIG. 3 is a schematic perspective view showing a second step in the process of manufacturing the magnetic head of FIG. 1;

FIG. 4 is a schematic perspective view showing a third step in the process of manufacturing the magnetic head of FIG. 1;

FIG. 5 is a schematic perspective view showing a fourth step in the process of manufacturing the magnetic head of FIG. 1;

FIG. 6 is a schematic perspective view showing a fifth step in the process of manufacturing the magnetic head of FIG. 1;

FIG. 7 is a schematic perspective view showing the overall configuration of a second embodiment of the magnetic head according to the present invention.

FIG. 8 is a schematic perspective view showing the overall configuration of a third embodiment of the magnetic head according to the present invention.

FIG. 9 is a schematic perspective view showing a first step in a manufacturing process of the magnetic head of FIG. 8;

FIG. 10 is a schematic perspective view showing a second step in the process of manufacturing the magnetic head of FIG. 8;

FIG. 11 is a schematic perspective view showing a third step in the process of manufacturing the magnetic head of FIG. 8;

FIG. 12 is a schematic perspective view showing a fourth step in the manufacturing process of the magnetic head of FIG. 8;

FIG. 13 is a schematic perspective view showing a fifth step in the process of manufacturing the magnetic head of FIG. 8;

FIG. 14 is a schematic perspective view showing the overall configuration of a fourth embodiment of the magnetic head according to the present invention.

FIG. 15 is a schematic perspective view showing an overall configuration of an example of a conventional magnetic head.

FIG. 16 is a schematic perspective view showing a first step in a manufacturing process of the magnetic head of FIG. 15;

FIG. 17 is a schematic perspective view showing a second step in the process of manufacturing the magnetic head of FIG. 15;

FIG. 18 is a schematic perspective view showing a third step in the process of manufacturing the magnetic head of FIG.

FIG. 19 is a schematic perspective view showing a fourth step in the process of manufacturing the magnetic head of FIG. 15;

20 is a schematic perspective view showing a fifth step in the process of manufacturing the magnetic head of FIG.

[Explanation of symbols]

20, 40 ... magnetic head, 21, 22 ... core half, 21a, 22a ... winding groove, 23 ... gap, 24, 25 ... track width regulating groove, 26 ... Metal magnetic film, 27: gap film, 28: bonding glass, 30: substrate, 31: winding groove, 32: track width regulating groove, 33: metal magnetic film, 34 ... gap film, 35 ... bonded glass, 36 ... sliding surface,
37: contact width regulating groove, 50, 70: magnetic head, 51, 52: core half, 51a, 52a ...
Winding groove, 53 gap, 54, 55 track width regulating groove, 56 metal magnetic film, 57 gap film, 58 bonding glass, 60 substrate, 61・
..Winding grooves, 62 ... Track width regulating grooves, 63 ...
Metal magnetic film, 64: gap film, 65: bonded glass, 66: sliding surface, 67: contact width regulating groove.

Claims (3)

[Claims] 1. A pair of core halves are joined to each other so as to form a gap at one end of a sliding surface to be brought into contact with a magnetic recording medium and to form a winding window below the gap. A magnetic core made of a magnetic material, wherein the gap is regulated to have a predetermined track width by track width regulating grooves provided on both side edges of the magnetic core. A step is formed in a region between the winding window and the sliding surface on the joint surface of the half body, and a high permeability / magnetic flux density film is formed in the step. Magnetic head. 2. The magnetic head according to claim 1, wherein the high magnetic permeability / magnetic flux density film is formed only in a step formed on a joint surface of each core half. 3. The magnetic head according to claim 1, wherein the high magnetic permeability / magnetic flux density film is also formed in a track width regulating groove.