JP2002042305A - Magnetic head - Google Patents

Abstract

(57) Abstract: A magnetic head capable of preventing electromagnetic conversion characteristics from deteriorating and preventing the adverse effect of a pseudo gap even when a groove for preventing an unnecessary leakage magnetic field is provided on a sliding surface of a magnetic head. To provide. SOLUTION: A sliding surface 120 on which a magnetic recording medium slides.
A magnetic gap g formed on the sliding surface, and a groove 150 for preventing an unnecessary leakage magnetic field at one end of the magnetic gap, wherein the magnetic gap is the magnetic gap Formed by abutting the first and second magnetic films 131 and 132 formed on a plane not parallel to
Each of the first and second magnetic films is arranged in a substantially C-shape toward the other end of the magnetic gap to form the magnetic head 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for recording and reproducing information signals such as audio signals, video signals, and data signals on a magnetic recording medium.

[0002]

2. Description of the Related Art Conventionally, a video tape recorder (VTR), a digital audio tape recorder (DAT), or a digital data recording / reproducing apparatus using a magnetic tape or the like as a magnetic recording medium is mounted on a recording track of a magnetic tape or the like. A magnetic head is provided for writing an information signal as a magnetic signal or reading an information signal recorded on a recording track as a magnetic signal.

[0003] The magnetic head includes a magnetic core formed by abutting two magnetic core halves, and a winding such as a coil wound around a coil winding opening formed in the magnetic core. Is constituted. This winding serves to transmit an information signal for recording or reproduction as a magnetic flux. The magnetic core functions as a path for transmitting magnetic flux from the winding to the magnetic tape during recording and from the magnetic tape to the winding during reproduction. Also, the magnetic head
It has a magnetic gap, and the magnetic gap is formed by abutting two magnetic core halves on each other via a gap material. The magnetic gap functions to narrow the range of the magnetic field spread to the magnetic tape at the time of recording, and to take in the magnetic flux from the magnetic tape at the time of reproduction.

[0004] Such a magnetic gap is formed on a sliding surface of a magnetic head on which a magnetic tape slides via a gap material. The sliding surface has a magnetic gap between the magnetic gap and the winding. A magnetic film for forming a circuit is also provided. This magnetic film is also formed on the side surface of the magnetic core where the winding opening is provided along the magnetic core from the sliding surface. That is, a magnetic circuit is formed of this magnetic film, and thus the magnetic head can function normally only for the first time. By the way, the sliding surface of such a magnetic head has conventionally been formed, for example, as shown in FIG. That is, as shown in FIG. 7, the magnetic head 10
The magnetic core half 11a and the magnetic core half 11b are abutted to form a magnetic gap g. Metal magnetic thin films 12a and 12b for forming the magnetic circuit are arranged on both sides of the magnetic gap g in the drawing.

[0005] The magnetic head 10 thus formed
When the magnetic tape slides on the sliding surface for recording or reproduction, information signals are exchanged with the magnetic tape via the gap g on the sliding surface. However, on both sides of the magnetic gap g of the magnetic head 10 in FIG. 7, the metal magnetic thin films 12a and 12b and the magnetic core halves 11a and 11b
Borders 13a and 13b are formed. And
The boundaries 13a and 13b are provided in parallel with the magnetic gap g as shown in the figure. Therefore, for the magnetic tape lying on the sliding surface of the magnetic head 10, these boundaries 13a and 13b act as pseudo gaps, which adversely affect the exchange of the information signals.

Therefore, a so-called T as shown in FIG.
SS (a tilted Sendust Sputt)
ered) type magnetic head 20 (Ferrite Vi)
Deo Head) is known. As shown in FIG. 8, the TSS type magnetic head 20 has a magnetic core half 21.
Metal magnetic thin films 22a and 22b are arranged between a and 21b, and a magnetic gap g is formed by these metal magnetic thin films 22a and 22b. Therefore, the boundaries 23a and 23b between the metal magnetic thin films 22a and 22b and the magnetic core halves 21a and 21b formed on both sides of the magnetic gap g of the TSS type magnetic head 20 are the same as those of the magnetic head 10 shown in FIG. Unlike the boundaries 13a and 13b, they are not arranged parallel to the magnetic gap g. Therefore, even if these boundaries 23a and 23b act as pseudo gaps, they are canceled out by azimuth loss and have no adverse effect.
Can smoothly exchange information signals.

[0007]

The above-mentioned T
In the SS type magnetic head 20, each magnetic core half 21a,
When joining the magnetic gaps 21b, the magnetic gap g may be shifted or the metal magnetic thin film 22a may be sagged at the edge A of the magnetic gap g. When an information signal is recorded or the like using the TSS type magnetic head 20 in a state where these deviations and sags have occurred, there is a problem that an unnecessary leakage magnetic field is generated from the edge A of the magnetic gap g, and the recording pattern is disturbed. . In particular, when the information signal recording method is an overwrite recording method as shown in FIG. 10, the S / N of recording by so-called side erase is reduced, and all the recording tracks of the magnetic tape cannot be used effectively. There was a problem. In order to solve this problem, for example, as shown in FIG. 9, a groove 33 is formed on the overwriting side of the magnetic gap g of the magnetic head 30 so that the edge A of the magnetic gap g does not shift or sag. It is also possible to do. However, when the groove 33 is formed as shown in FIG. 9, since the groove 33 is provided in the metal magnetic thin film 32a, the above-described magnetic circuit is cut by the groove 33, and the electromagnetic conversion characteristics of the magnetic head deteriorate. Problem had arisen.

In view of the above, the present invention does not degrade the electromagnetic conversion characteristics and does not adversely affect the pseudo gap, even if a groove for preventing an unnecessary leakage magnetic field is provided on the sliding surface of the magnetic head. It is an object of the present invention to provide a magnetic head capable of preventing the magnetic head.

[0009]

According to the first aspect of the present invention, there is provided a sliding surface on which a magnetic recording medium slides, a magnetic gap formed on the sliding surface, and a magnetic gap formed on the sliding surface. And a groove for preventing an unnecessary leakage magnetic field at one end of the magnetic head, wherein the magnetic gap is formed on a surface non-parallel to the magnetic gap by a gap material. And the first and second magnetic films are arranged in a substantially C-shape toward the other end of the magnetic gap. Is achieved by a magnetic head.

According to the first aspect of the present invention, the magnetic gap is formed by abutting the first and second magnetic films formed on a surface non-parallel to the magnetic gap via the gap material. Since each of the first and second magnetic films is disposed in a substantially C-shape toward the other end of the magnetic gap, unnecessary leakage magnetic fields on the sliding surface are prevented. The first and / or
Alternatively, the second magnetic film is not cut. For this reason,
The magnetic circuit formed in the magnetic head is not cut by the groove. Further, since the magnetic gap and the interface between the first and second magnetic films are not arranged in parallel, the pseudo gap at the interface between the magnetic films does not adversely affect the magnetic film.

Preferably, according to a second aspect of the present invention, in the configuration of the first aspect, the groove is formed on a side on which the magnetic recording medium is overwritten. .

According to the second aspect of the present invention, since the groove is formed on the side on which the magnetic recording medium is overwritten, the recording method on the magnetic recording medium is the overwriting recording method. Also, it is possible to effectively prevent an unnecessary leakage magnetic field or the like from being generated from one end of the magnetic gap.

Preferably, according to a third aspect of the present invention, in the configuration of the second aspect, the first and second magnetic films include:
A magnetic head characterized by being continuously arranged on a side surface of a magnetic core where a coil winding opening is formed.

According to the third aspect of the present invention, the first and second magnetic films are continuously arranged on the side of the magnetic core where the winding opening of the coil is formed. A magnetic circuit is formed by the first and second magnetic films on the sliding surface, the first and second magnetic films on the side surfaces of the magnetic core, and the windings of the coil. Then, this magnetic circuit is not formed on the sliding surface on the groove side, which is one end side of the magnetic gap, and on the side surface of the magnetic core formed continuously therewith.

Preferably, according to a fourth aspect of the present invention, in the configuration of the third aspect, the first and second magnetic films disposed on the side surface of the magnetic core are provided on both sides of a winding opening of the coil. A magnetic head, which is arranged substantially in parallel.

According to the fourth aspect of the present invention, the first and second magnetic films disposed on the side surfaces of the magnetic core are disposed substantially parallel to both sides of the winding opening of the coil. The first and second magnetic films do not bend on the magnetic core. Therefore, the first and second magnetic films become uniform films in forming a thin film such as sputtering, and the efficiency of the magnetic circuit formed in the magnetic head is improved.

Preferably, according to a fifth aspect of the present invention, in the configuration of the fourth aspect, the first and second magnetic films include:
The magnetic head is disposed at an angle of 40 to 70 degrees with respect to the magnetic gap.

According to a fifth aspect of the present invention, the first and second magnetic films are arranged so that the angle between the first magnetic film and the second magnetic film is between 40 degrees and 7 degrees.
They are arranged at an angle of 0 degrees. That is, this angle is 4
If the angle is set to less than 0 degree and the first and second magnetic films are arranged in parallel on the side surface of the magnetic core without being interrupted by the opening of the coil, the opening of the coil must be significantly reduced. In this case, it is not possible to perform winding on the winding opening of the coil. On the other hand, the angle is 7
If it exceeds 0 degrees, the first and second magnetic films have a large difference between a sparse part and a dense part in thin film formation such as sputtering, and the magnetic film is not a homogeneous film. Therefore, by setting the angle to 40 degrees to 70 degrees,
The first and second magnetic films can be arranged on the magnetic core while securing a winding opening area of a coil that can be wound, while being a homogeneous film. For this reason, the efficiency of the magnetic circuit formed in the magnetic head is improved.

Preferably, according to the invention of claim 6, in the configuration of claim 5, the first and second magnetic films are:
A magnetic head characterized by being formed of a high-permeability ferromagnetic film.

According to the sixth aspect of the present invention, the first and second magnetic films are formed of a high magnetic permeability ferromagnetic film. A high performance magnetic head can be obtained.

Preferably, according to a seventh aspect of the present invention, in the configuration of the sixth aspect, the groove is formed in parallel with a sliding direction of the magnetic recording medium, and the groove of the magnetic recording medium slides in the groove. A magnetic head characterized in that a groove width in a moving direction is formed to be 30 μm or less.

According to the configuration of claim 7, since the groove width of the groove in the sliding direction of the magnetic recording medium is formed to be 30 μm or less, the characteristics of the magnetic head do not deteriorate.

Preferably, according to an eighth aspect of the present invention, in the magnetic head according to the seventh aspect, the groove is filled with a non-magnetic material.

According to the eighth aspect of the present invention, since the groove is filled with a non-magnetic material, the magnetic recording medium is not damaged, and powder removed from the magnetic recording medium does not accumulate in the groove.

[0025]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description in the following description. It is not limited to these forms unless otherwise stated.

FIG. 1 shows an MIG according to an embodiment of the present invention.
FIG. 1 is a schematic perspective view showing a (metal-in-gap) type magnetic head 100. FIG. 2 shows the MIG type magnetic head 10 of FIG.
FIG. 2 is a schematic enlarged plan view of a sliding surface of No. 0. The MIG type magnetic head 100 is used for recording an information signal such as an image on a magnetic recording medium, for example, a magnetic tape, and reproducing an information signal such as an image on a magnetic tape. By the way, in recording and reproducing such information signals such as images, in recent years, for the purpose of improving the image quality of images, or for the purpose of increasing the storage capacity, the wavelength of the information signals has been shortened, and A high-density magnetic recording method is employed for recording and reproducing the information signal. In order to adopt this high-density magnetic recording method, the magnetic tape is also a high coercive force type magnetic tape. Specific examples of such a high coercive force type magnetic tape include a metal tape and a vapor-deposited tape. This metal tape is formed, for example, by applying a ferromagnetic metal powder as a magnetic powder on a base film to form a magnetic layer. In addition, evaporation tape,
It is formed by directly depositing a ferromagnetic metal material on a base film.

In order to record and reproduce information signals such as images with the high coercive force type magnetic tape thus formed,
The MIG magnetic head 100 shown in FIG. 1 is used.
The MIG magnetic head 100 has the following configuration. That is, the MIG magnetic head 100
First, as shown in FIG. 1, two magnetic core halves 111, 1
12. These magnetic core halves 111, 112
Is formed of, for example, a ferromagnetic oxide such as Mn-Zn ferrite. Also, the magnetic core halves 111, 11
A sliding surface 120 on which the above-described magnetic tape slides is formed on the upper surface in FIG. FIG. 2 shows a plan view of the sliding surface 120. As shown in FIG. 2, the magnetic core halves 111, 112
Are each formed in a chevron, on both sides of the top,
Each of the two inclined surfaces is formed. That is, the magnetic core half 111 has a first inclined surface 111b and a second inclined surface 111c as shown in FIG. 2, and the magnetic core half 112 has a first inclined surface 112b and a second inclined surface 111b. Are formed, respectively.

The first of these magnetic core halves 111 and 112
As shown in FIG. 2, a first high-permeability ferromagnetic metal film 131 serving as a first magnetic film and a second high-permeability ferromagnetic metal serving as a second magnetic film are formed on the inclined surfaces 111b and 112b. Membrane 132
Are formed with a constant thickness. The first high permeability ferromagnetic metal film 131 and the second high permeability ferromagnetic metal film 13
2 is made of, for example, sendust, which is a high magnetic permeability alloy, but other materials such as FeTa-based, FeCo-based amorphous, and FeSiGa-based can also be used. Further, the first high magnetic permeability ferromagnetic metal film 131 and the second high magnetic permeability ferromagnetic metal film 132 are formed of the magnetic core half 111,
The first inclined surfaces 111b, 112b of 112 are laminated and formed via an insulating film using a vacuum thin film forming technique such as sputtering.

The first high-permeability ferromagnetic metal film 131
The second ferromagnetic metal film 132 and the second high magnetic permeability film abut each other via a gap spacer (not shown) made of SiO2 or the like to form a magnetic gap g as shown in FIG. Further, the first high permeability ferromagnetic metal film 1 shown in FIG.
31 and the lower part of the second high-permeability ferromagnetic metal film 132 and the second inclined surface 111 of the magnetic core halves 111 and 112.
Non-magnetic material, for example, glass 140 is melt-filled in the upper part of c and 112c. Thus, M
A magnetic gap g is formed on the sliding surface of the IG type magnetic head 100, and the track width Tw of the magnetic gap g is formed.
Is determined by the thicknesses of the first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132.

At the upper end of the magnetic gap g, which is one end of the track width Tw in the drawing, a linear groove 150 is arranged parallel to the sliding direction of the magnetic tape as shown in FIG. I have. The width of the groove is, for example, 30 μm or less. This range is a range where the contact between the magnetic tape and the MIG type magnetic head 100 is good, and the wear resistance is equal to that of the conventional magnetic head while preventing characteristic deterioration. The recording method of the magnetic tape used in the MIG-type magnetic head 100 configured as described above uses an information signal such as a video signal as shown in FIG.
This is an overwriting recording system for overwriting as shown in FIG. Then, the groove 150 is formed on the side where the magnetic tape is overwritten.

By arranging the groove 150 at one end of the magnetic gap g on the overwriting side as described above, the first high permeability ferromagnetic metal film 131 and the second high permeability at one end of the magnetic gap g are arranged. Even if the magnetic permeability of the ferromagnetic metal film 132 is displaced or sagged, it is possible to prevent an unnecessary leakage magnetic field from being generated from this one end portion. By preventing the generation of the unnecessary leakage magnetic field, it is possible to avoid disturbing the recording pattern of the magnetic tape. Incidentally, the first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132 in FIG. 2 have a substantially C-shape on the other end side where the groove 150 of the magnetic gap g is not formed. Are located in The first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132 are each disposed so as to maintain an angle of 40 to 70 degrees with respect to the magnetic gap g. .

Therefore, the first inclined surface 111b, which is the boundary between the first high-permeability ferromagnetic metal film 131 and the magnetic core half 111, and the magnetic gap g are not arranged in parallel. Therefore, even if a pseudo gap is formed on the first inclined surface 111b, azimuth loss does not adversely affect the recording and reproduction of information signals such as images. This is because the first inclined surface 11 which is the boundary between the second high-permeability ferromagnetic metal film 132 and the magnetic core half 112 in FIG.
The same applies to 2b. Further, as described above, the first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132 have a substantially C-shape on the other end side where the groove 150 of the magnetic gap g is not formed. It is arranged in a shape. For this reason,
The first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132 are cut by the groove 150 formed on the sliding surface 120 of the MIG type magnetic head 100, and the magnetic circuit is completed. You will not be divided.

The first high permeability ferromagnetic metal film 131
The second high-permeability ferromagnetic metal film 132 is also disposed on the side surface on the near side in the drawing of the magnetic core halves 111 and 112 as shown in FIG. The coil opening 160 of the coil is inserted. The magnetic signal input in the magnetic gap g as described above is transmitted to the first high-permeability ferromagnetic metal film 131.
Alternatively, the signal electromagnetically converted by the coil wound around the coil winding opening 160 via the second high magnetic permeability ferromagnetic metal film 132, and the signal electromagnetically converted by the coil is converted into the first high magnetic permeability. A magnetic circuit that is output in the magnetic gap g via the ferromagnetic metal film 131 or the second high-permeability ferromagnetic metal film 132 is formed in the MIG magnetic head 100. Since this magnetic circuit is not arranged on the groove 150 side of the magnetic gap g, it is possible to effectively prevent the magnetic circuit from being cut by the groove 150 and deteriorating the electrical conversion characteristics of the MIG type magnetic head 100. .

Further, an extremely high-precision MIG-type magnetic head 10 capable of preventing the generation of an unnecessary leakage magnetic field while preventing the electric conversion characteristics of the MIG-type magnetic head 100 from deteriorating.
It becomes 0. On the other hand, the first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132, which are also arranged on the front side surface in the drawing of the MIG magnetic head 100, are mutually The first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132 disposed in parallel and disposed on the sliding surface 120 are disposed straight down without bending from the ends of the first high-permeability ferromagnetic metal film 132. Have been. In addition, the first high magnetic permeability ferromagnetic metal film 131 and the second high magnetic permeability ferromagnetic metal film 132 thus arranged straight are arranged so that the magnetic circuit is not cut by the winding opening 160 of the coil. ing. Therefore, the magnetic circuit is cut by the winding opening 160 of the coil, and the MIG magnetic head 100
Can be prevented from being deteriorated.

Further, the first high permeability ferromagnetic metal film 131 and the second high permeability ferromagnetic metal film 132 disposed on the side surface of the MIG type magnetic head 100
First high permeability ferromagnetic metal film 13 disposed on
The first and second high-permeability ferromagnetic metal films 132 are disposed straight downward without bending from the ends. In general, when the first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132 are bent and arranged, the films become inhomogeneous in the formation of a thin film such as sputtering, and the performance of the metal film deteriorates. It is known. However, in the present embodiment, since the first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132 are arranged without being bent, performance degradation of the metal films is also prevented. be able to. The angle θ (see FIG. 2) of the first high magnetic permeability ferromagnetic metal film 131 and the second high magnetic permeability ferromagnetic metal film 132 disposed on the sliding surface 120 with respect to the magnetic gap g is 40 degrees. To 70 degrees.

That is, if the angle θ is less than 40 degrees, the first high permeability ferromagnetic metal film 131 must be formed unless the coil opening 160 of the coil formed on the side surface of the MIG magnetic head 100 is made extremely small. Therefore, the second high permeability ferromagnetic metal film 132 cannot be disposed on the side surface of the MIG magnetic head 100 without bending. If the metal film is not bent, the magnetic circuit will be cut at the winding opening 160 of the coil. On the other hand, if the coil opening 160 is too small, it is practically difficult to wind the coil around the coil opening 160. Therefore, the angle θ needs to be 40 degrees or more. When the angle θ is 70 degrees or more, when forming the first high-permeability ferromagnetic metal film 131 and the second high-permeability ferromagnetic metal film 132, the films are sparse due to the angle of sputtering. The magnetic film is no longer a homogeneous film. In addition,
The magnetic core halves 111 and 112 may be opposite to the non-magnetic substrate. Also, the second inclined surfaces 111c, 112c
A magnetic film may be formed on the upper and side surfaces thereof. However, this magnetic film does not work as a magnetic circuit.

The MIG type magnetic head 100 configured as described above can be used, for example, in a video tape recorder (VTR).
When recording and reproducing are performed on magnetic tapes of the overwriting recording method, a high-precision video tape recorder (VTR) with good electromagnetic conversion characteristics without disturbing the recording pattern of the magnetic tape is used. Can be configured. Therefore, the MIG magnetic head 100 and the video tape recorder (VTR) can sufficiently cope with a high-density magnetic recording system for recording and reproducing more information signals by shortening the wavelength of the information signal.

Hereinafter, a method of manufacturing the MIG type magnetic head 100 according to the present embodiment will be described. First, as shown in FIG. 3, two base materials 3 made of Mn—Zn ferrite were used.
00a and 300b are prepared. These two base materials 30
In each of 0a and 300b, a groove is formed in a mountain shape as shown in FIG. 3 on one side. The tops of the valleys thus formed correspond to the magnetic core halves 111 and 112 in FIG.
Are the parts forming the tops 111a and 112a. In addition, the inclined surface formed from the top to the valley is a portion that forms the first inclined surface 111b, 112b or the second inclined surface 111c, 112c in FIG. For example, the inclined surfaces 301, 301 in FIG. 3 become the first inclined surfaces 111b, 112b, and the inclined surfaces 302, 301,
302 becomes the second inclined surfaces 111c and 112c.

Therefore, the first inclined surface 111b,
The portions of the inclined surfaces 301 and 301 which are 112b are formed such that the angle θ with respect to the magnetic gap g in FIG. 2 is, for example, 55 degrees. Next, as shown in FIG. 4, at least the inclined surfaces 30 of the base materials 300a and 300b are formed.
A high-permeability ferromagnetic metal film is formed on the portion 301 by sputtering, for example, using sendust of a high-permeability alloy. At this time, the high magnetic permeability ferromagnetic metal film is formed to be considerably thick on the inclined surfaces 301 and 301. At this time, a high-permeability ferromagnetic metal film may be formed thinly on the inclined surfaces 302 and 302 side. Slope 30
After the high-permeability ferromagnetic metal film is formed on the base materials 1 and 301, a portion to be the winding opening 160 of the coil is formed on the base materials 300a and 300b. Next, the high-permeability ferromagnetic metal film formed on the inclined surfaces 301, 301 is moved to the track Tw width of FIG.
Mirror finish to double the thickness.

Then, as shown in FIG.
Becomes to match the 00a and the base material 300b, this time, by forming a gap film of SiO ₂ on to the deposited on the inclined surface 301, 301 high permeability ferromagnetic metal film, the SiO ₂ The ferromagnetic metal films having high magnetic permeability are abutted to each other. Then, predetermined processing is performed so that the butted portions of the high magnetic permeability ferromagnetic metal films form the magnetic gap g shown in FIG. Further, the cavity 303 shown in FIG. 5 is filled with glass. Further, as shown in FIG.
The groove 150 is formed so as to be parallel to the sliding direction of the magnetic tape and to have a groove width of 30 μm or less. Then, glass is filled in the groove 150. Then, after the cylindrical surface of the contact surface which becomes the sliding surface 120 of the MIG magnetic head 100 with respect to the magnetic tape and the contact width processing are performed, the MIG type magnetic head 100 shown in FIG.

The configuration of the above-described embodiment can be partially omitted, or can be changed to any other combination not described above.

[0042]

As described above, according to the present invention, even when a groove for preventing an unnecessary leakage magnetic field is provided on the sliding surface of the magnetic head, the electromagnetic conversion characteristics do not deteriorate and the adverse effect of the pseudo gap does not occur. It is possible to provide a magnetic head that can also prevent occurrence.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a MIG type magnetic head according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the MIG type magnetic head of FIG.

FIG. 3 is a schematic view showing a manufacturing process of the MIG type magnetic head of FIG.

FIG. 4 is a schematic view showing a manufacturing step subsequent to FIG. 3;

FIG. 5 is a schematic view showing the next manufacturing step of FIG. 4;

FIG. 6 is a schematic view showing a manufacturing step subsequent to FIG. 5;

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

FIG. 8 is a schematic view showing a sliding surface of another conventional magnetic head.

FIG. 9 is a schematic view showing a state where a groove is provided in the magnetic head of FIG. 8;

FIG. 10 is an explanatory diagram of an overwrite recording method.

[Explanation of symbols]

100: MIG type magnetic head, 111, 112 ...
A magnetic core half, 111b, 112b ... a first inclined surface, 111c, 112c ... a second inclined surface, 120
..Sliding surface, 131: first high permeability ferromagnetic metal film, 132: second high permeability ferromagnetic metal film, 140
... Glass, 150 ... Groove, 160 ... Coil winding opening, 300a, 300b ... Base material, 301,
302: inclined surface, 303: cavity

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[Procedure amendment]

[Submission date] September 13, 2000 (2009.1)
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

Therefore, a so-called T as shown in FIG.
SS (a T ilted Sendust Sputt
2. Description of the Related Art A known magnetic head 20 of an erased ferrite video head type is known. As shown in FIG. 8, the TSS type magnetic head 20 has a magnetic core half 21.
Metal magnetic thin films 22a and 22b are arranged between a and 21b, and a magnetic gap g is formed by these metal magnetic thin films 22a and 22b. Therefore, the boundaries 23a and 23b between the metal magnetic thin films 22a and 22b and the magnetic core halves 21a and 21b formed on both sides of the magnetic gap g of the TSS type magnetic head 20 are the same as those of the magnetic head 10 shown in FIG. Unlike the boundaries 13a and 13b, they are not arranged parallel to the magnetic gap g. Therefore, even if these boundaries 23a and 23b act as pseudo gaps, they are canceled out by azimuth loss and have no adverse effect.
Can smoothly exchange information signals.

Claims (8)

[Claims] 1. A sliding surface on which a magnetic recording medium slides, a magnetic gap formed on the sliding surface, and a groove for preventing an unnecessary leakage magnetic field at one end of the magnetic gap. A magnetic head, wherein the magnetic gap is formed by abutting a first and second magnetic film formed on a surface non-parallel to the magnetic gap via a gap material, and 2. A magnetic head, wherein each of the two magnetic films is arranged in a substantially C shape toward the other end of the magnetic gap. 2. The magnetic recording medium according to claim 1, wherein the groove is formed on a side on which the magnetic recording medium is overwritten.
3. The magnetic head according to claim 1. 3. The magnetic device according to claim 2, wherein the first and second magnetic films are continuously arranged also on a side surface of the magnetic core where a winding opening of the coil is formed. head. 4. The first core disposed on a side surface of the magnetic core.
4. The magnetic head according to claim 3, wherein the second magnetic film is arranged substantially parallel to both sides of the winding opening of the coil. 5. The magnetic head according to claim 4, wherein the first and second magnetic films are arranged at an angle of 40 to 70 degrees with respect to the magnetic gap. 6. The magnetic head according to claim 5, wherein the first and second magnetic films are formed of a high-permeability ferromagnetic film. 7. The method according to claim 1, wherein the groove is formed in parallel with a sliding direction of the magnetic recording medium, and a groove width of the groove in the sliding direction of the magnetic recording medium is formed to be 30 μm or less. The magnetic head according to claim 6. 8. The magnetic head according to claim 7, wherein the groove is filled with a non-magnetic material.