JPH0660318A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head superior in wear resistance by approximately linearly forming metallic magnetic films at an angle to the magnetic head running direction. CONSTITUTION:Magnetic core half bodies I and II where a metallic magnetic film 1 is interposed between a pair of guard materials 2 and 3 are butted, and a magnetic gap (g) is constituted between butting faces. Winding grooves 4 and 5 are formed in core half bodies I and II respectively, and coils are wound around these grooves to supply/take out signals to/from a head. Metallic magnetic films 1 are multilayered films where thin films made of a high-permeability material like 'Sendust(R)' are laminated with an insulating film between them, and guard materials 2 and 3 are made of ferrite. End faces on the sides opposite to the gap (g) forming sides of metallic magnetic films 1 are so cut that they slightly stand back from side faces of magnetic core half bodies I and II, and end parts are filled with glass 8. Since the extension direction of magnetic films 1 is made nonparallel with the tape sliding direction of the magnetic head, a proportion occupied by the magnetic films 1 on the tape slide face is considerably reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a video tape recorder or the like, and more particularly to improvement of a so-called sandwich type magnetic head in which a metal magnetic film is sandwiched between guard materials. .

[0002]

2. Description of the Related Art As a magnetic head for recording / reproducing in a high band of 10 to 50 MHz or more, a magnetic core is formed by alternately laminating metal soft magnetic thin films of about 1 to 5 μm and insulating films of about 1000 to 2000 Å in thickness. A magnetic head that can be used is put to practical use. For example, as shown in FIG. 9, one obtained by forming the above-mentioned metal magnetic thin film laminate 103 by a vacuum thin film forming technique on a non-magnetic abrasion-resistant ceramic substrate 101, 102 such as crystallized glass or calcium titanate is used. A so-called sandwich type magnetic head is known.

On the other hand, in the magnetic head, the relative speed with the magnetic tape is increasing more and more with the increase of the band, and it is about several m / sec to several tens m / sec in the conventional 1/2 inch width magnetic tape. It is required to handle severe conditions. This increase in the relative speed accelerates the wear of the magnetic head, and thus a magnetic head having excellent wear resistance is required more than ever before.

[0004]

However, in the above-mentioned sandwich type magnetic head, about 3/8 of the contact area with the magnetic tape is made of a metal material that is more easily worn than ceramics. Compared to the metal-in-gap type magnetic head, whose wear resistance is almost entirely ceramic, it wears significantly faster.

For example, in the magnetic head shown in FIG. 9, the contact width with the magnetic tape is set to about 60 to 100 μm, and the contact length is set to about 1.6 mm. The thickness of the magnetic metal thin film stack 103 corresponding to the track width is 30 μm.
It is about m. It is not a good idea to make the contact width with the magnetic tape too wide in order to keep good contact with the magnetic tape and to keep the spacing loss small especially in short wavelength recording.

Further, the contact length can be made smaller and the output per unit inductance can be made larger by making the contact length as small as possible within the range of maintaining good contact with the magnetic tape. .
For this reason, the contact width and the contact length are set to the above-mentioned dimensions, and when the area ratio is calculated based on this, the ratio of the metal portion is about 37%. The magnetic thin film laminate 103 wears faster than the non-magnetic wear-resistant ceramic substrates 101 and 102 and is inferior in wear resistance.

Even in the sandwich type magnetic head as shown in FIG. 9, if the metal magnetic thin film laminate 103 is sandwiched between the high abrasion resistant substrates such as AlTiC (Al-Ti-C), the entire magnetic head is formed. However, in this case, the spacing loss increases due to the uneven wear of the metal magnetic thin film laminate 103, and the output decreases.

On the other hand, FIG. 10 shows a magnetic head used in, for example, an 8 mm video tape recorder. This magnetic head has ferrite cores 111 and 112.
V-shaped groove is formed in the metal film 113, 114
It is formed by depositing glass and filling glass 1115 and 116. Since most of the area in contact with the magnetic tape is composed of the ferrite cores 111 and 112, it is excellent in wear resistance, and is also resistant to AlTiC and metal. It has both wear resistance and output without the occurrence of uneven wear.

However, in the magnetic head shown in FIG. 10, the metal films 113 and 114 are not continuous around the winding groove 117. For example, when used in a high band around 50 MHz, the metal films are continuous. It is disadvantageous in output as compared with the formed magnetic head.

Further, in the magnetic head having such a structure,
Magnetic gap surface and metal film 113, 114 formation surface 111
It is also possible to set the angle formed by a and 112a close to 80 ° so that the metal films 113 and 114 extend in the length direction in contact with the magnetic tape. It is necessary to deepen the V-shaped groove, and the metal film 11
A problem remains in the film forming property of Nos. 3 and 114.

Therefore, the present invention has been proposed in view of the above-mentioned conventional circumstances, and is excellent in wear resistance, and
An object is to provide a magnetic head that exhibits high output in a high band of 0 to 50 MHz or higher.

[0012]

In order to achieve the above-mentioned object, the present invention provides a magnetic head in which a metal magnetic film is sandwiched by a pair of guard members, wherein the metal magnetic film is oriented in the running direction of the magnetic head. It is characterized in that they are diagonally crossed and are connected in a substantially straight line.

That is, in the magnetic head of the present invention, in the sandwich type magnetic head, the ratio of the metal magnetic film occupying the contact surface of the magnetic tape by obliquely arranging the metal magnetic film is not aligned with the running direction of the magnetic head. Smaller,
In addition to improving wear resistance, the metal magnetic film is not interrupted even in the winding groove, and a high output is secured even in a high band.

[0014]

In the magnetic head of the present invention, since the metallic magnetic film is sandwiched by the guard members and the metallic magnetic film is obliquely arranged in a straight line with respect to the running direction of the magnetic head. The ratio of the metal magnetic film to the tape contact surface is greatly reduced and high wear resistance is secured.

Further, since the magnetic head of the present invention is a so-called sandwich type magnetic head, it can be obliquely arranged at an arbitrary angle without causing a problem in the film forming property of the metal magnetic film. Since the metal magnetic film does not break at the winding groove portion, the output in a high band is secured.

[0016]

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

In the magnetic head of this embodiment, as shown in FIGS. 1 and 2, magnetic core halves I and II in which a metal magnetic film 1 is sandwiched by a pair of guard members 2 and 3 are butted against each other and the butted surfaces are brought together. A magnetic gap g is formed between them. Each of the magnetic core halves I and II has winding grooves 4, 5 respectively.
Are cut and formed, and a coil is wound around the winding grooves 4 and 5, whereby a signal is supplied to or taken out from the magnetic head.

The metal magnetic film 1 is made of sendust or Fe-Ga.
It is a multilayer film in which thin films of a high magnetic permeability material such as -Si or an amorphous alloy are laminated via an insulating film, and the guard materials 2 and 3 are formed of ferrite. Therefore, in the magnetic head of the present embodiment, the guard members 2 and 3 are cut out in the vicinity of the magnetic gap g in order to regulate the track width, and the space formed by this is filled with the glasses 6 and 7. There is.

The magnetic gap g of the metal magnetic film 1
The end face on the side opposite to the forming side is cut so as to slightly recede from the side faces of the magnetic core halves I and II, and the glass 8 is attached to the end.
Is filled. This is because when the metal magnetic film 1 is exposed on the side surfaces of the magnetic core halves I and II, stress is prevented from being applied to the metal magnetic film 1 when slicing to each magnetic head chip, and the slicing process is smoothed. To do this.

In the magnetic head described above, the metal magnetic film 1 on the tape sliding surface is made by making the extending direction of the metal magnetic film 1 non-parallel to the tape sliding direction of the magnetic head (traveling direction of the magnetic head). Has significantly reduced the share of. That is, in the magnetic head shown in FIGS. 1 and 2, the ratio of the metal magnetic film 1 to the tape sliding surface is about 10 ° by setting the angle between the metal magnetic film 1 and the magnetic head running direction to be about 10 °. Has been reduced to%.

Further, as shown in FIG. 1, the metal magnetic film 1 continuously forms a magnetic path so as to surround the winding grooves 4 and 5, and therefore the high permeability of the metal magnetic film 1 is achieved. The magnetic susceptibility characteristics can be fully exhibited.

The ratio of the tape sliding area to the wear resistance is not a mere proportional relation, but the wear resistance increases as the wear resistance extends in the direction perpendicular to the tape sliding direction. Including the above effect, the area occupied by the metal magnetic film in the magnetic head shown in FIG. 9 was 37.5%, whereas the effect obtained by reducing the area to 10% in the magnetic head shown in FIG. The abrasion resistance was improved by 30% or more.

Further, the chip thickness is 1.5 times, the angle between the gap surface and the sliding direction is 20 ° while the metal magnetic film 1 keeps the shape of continuously surrounding the winding grooves 4 and 5. By doing so, the wear resistance was improved by 50% or more. In addition,
The abrasion resistance was measured by running the magnetic tape with a video tape recorder and evaluating the amount of abrasion of the head per unit time.

Although the guard members 2 and 3 are made of ferrite in this embodiment, they may be made of a non-magnetic and highly abrasive ceramic material or the like. In this case, the glasses 6 and 7 for restricting the track width are unnecessary, but the glass filled in the vicinity of the gap is effective in reducing uneven wear step and reducing spacing loss in the vicinity of the gap. Therefore, in order to improve the head output, it is preferable to fill the glasses 6 and 7 as in the case of ferrite.

Further, the groove 2 for filling the glasses 6 and 7
If a and 3a are formed obliquely with respect to the depth direction as shown in FIG. 3, an unnecessary non-magnetic material is not arranged on the back gap side, and it is possible to achieve higher output. .

Next, a method of manufacturing the magnetic head having the above structure will be described. In order to manufacture the magnetic head shown in FIGS. 1 and 2, first, as shown in FIG. 4, a multi-layered film formed by stacking sendust and the like on an ferrite substrate 11 via an insulating layer is used as the metal magnetic film 12. As a rectangular pattern by masking or the like.

Next, after forming a glass sputtered film (not shown) on the surface of the metal magnetic film 12, they are stacked as shown in FIG.
The glass 13 inflows and bonds at a temperature of about 00 ° C.

Next, after the surface is ground, the surface is divided into two as shown in FIG. 6, and the divided surface is further polished. Thereafter, on this divided surface, groove processing is performed at a position along the boundary line between the ferrite substrate 11 and the metal magnetic film 12 so as to reach the edge of the metal magnetic film 12, and the track width regulating groove 14 is formed.
Is cut and formed, and the winding groove 15 is further grooved.

FIG. 7 shows a state in which the track width regulating groove 14 and the winding groove 15 are paired with a grooved block. In this state, when both cores are butted against each other through the gap spacer and fused with the glass 16 having a lower melting point than the previous low melting point glass, the glass 16 also flows into the track width regulating groove 14 and is shown in FIG. The head core block is completed.

When the head core block shown in FIG. 8 is obliquely sliced and separated at the positions indicated by the lines X--X and Y--Y, the head chip of the previous embodiment is completed. In addition,
At this time, end processing for narrowing the contact width with the magnetic tape may be performed as necessary.

Although the embodiment of the magnetic head to which the present invention is applied and the manufacturing method thereof have been described above, it goes without saying that the present invention is not limited to this embodiment. For example, materials such as a guard material and a metal magnetic film are arbitrary.

[0032]

As is clear from the above description, in the magnetic head of the present invention, since the metal magnetic film is arranged obliquely with respect to the traveling direction of the magnetic head in the sandwich type magnetic head, the tape sliding is performed. The area of the metal magnetic film occupying the moving surface can be reduced, and a magnetic head having excellent wear resistance can be provided.

Further, since the metal magnetic film is not discontinuous in the winding groove portion, it is possible to provide a magnetic head which exhibits a high output even in a high band of 10 to 50 MHz or higher.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a magnetic head to which the present invention is applied.

FIG. 2 is a schematic plan view showing a magnetic tape sliding surface of the magnetic head shown in FIG.

FIG. 3 is a schematic perspective view showing another embodiment of the magnetic head to which the present invention is applied.

FIG. 4 is a schematic perspective view showing a metal magnetic film forming step, showing an example of the manufacturing steps of the magnetic head to which the present invention is applied in the order of steps.

FIG. 5 is a schematic perspective view showing a superposed state of ferrite substrates on which a metal magnetic film is formed.

FIG. 6 shows a ferrite substrate bonded with a low-melting glass 2
It is a schematic perspective view which shows the divided state.

FIG. 7 is a schematic perspective view showing a groove processing step of a track width regulating groove and a winding groove.

FIG. 8 is a schematic perspective view showing a glass fusion step of the head core block.

FIG. 9 is a schematic perspective view showing an example of a conventional magnetic head.

FIG. 10 is a schematic perspective view showing another example of a conventional magnetic head.

[Explanation of symbols]

 1 ... Metal magnetic film 2, 3 ... Guard material

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[Procedure amendment]

[Submission date] July 12, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Further, in the magnetic head having such a structure,
Magnetic gap surface and metal film 113, 114 formation surface 111
It is possible to set the angle formed by a and 112a to be close to 80 ° so that the metal films 113 and 114 extend in the length direction in contact with the magnetic tape. In this case, the quotient described above is used. It is necessary to deepen the V-shaped groove, and the metal film 11
Deterioration of film forming property of Nos. 3 and 114, influence of adjacent groove edge
However, problems such as deterioration of magnetic properties remain.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

The metal magnetic film 1 is made of sendust or Fe-Ga.
-Si-Ru is a multi-layer film in which thin films of a high magnetic permeability material such as an amorphous alloy are laminated via an insulating film, and the guard materials 2 and 3 are formed of ferrite. Therefore, in the magnetic head of the present embodiment, the guard members 2 and 3 are cut out in the vicinity of the magnetic gap g in order to regulate the track width, and the space formed by this is filled with the glasses 6 and 7. There is.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

Further, the chip thickness is 1.5 times, the angle between the gap surface and the sliding direction is 20 ° while the metal magnetic film 1 keeps the shape of continuously surrounding the winding grooves 4 and 5. By doing so, the wear resistance was improved by 50% or more. In addition,
In order to compare the same contact area, the chip thickness should be 1.5 times.
However, there is no change in the contact width on the tape sliding surface.
It goes without saying that we evaluated without doing this. In Figure 1
A is the contact width, and B is the chip thickness. The abrasion resistance was measured by running the magnetic tape on a video tape recorder and evaluating the amount of abrasion of the head per unit time.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

Next, after polishing the periphery with a flat surface, it is divided into two as shown in FIG. 6, and the divided surface is further polished. Thereafter, on this divided surface, groove processing is performed at a position along the boundary line between the ferrite substrate 11 and the metal magnetic winding 12 so as to reach one side edge of the metal magnetic winding 12, and the track width regulating groove 14 is formed.
Is cut and formed, and the winding groove 15 is further grooved.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinji Takahashi 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Akira Urai 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Kei Sato 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Tomio Kobayashi 6-35 Kitagawa, Shinagawa-ku, Tokyo Sony Within the corporation

Claims (3)

[Claims] 1. A magnetic head in which a metal magnetic film is sandwiched between a pair of guard members, wherein the metal magnetic film is obliquely crossed with respect to the running direction of the magnetic head and is continuous in a substantially straight line. Magnetic head. 2. The magnetic head according to claim 1, wherein the guard material is made of ferrite, and glass is filled near the gap. 3. The magnetic head according to claim 2, wherein the track width regulating groove is formed by simultaneously processing the guard material and the metal magnetic film.