JPH09282605A - Magnetic head and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely judge the position of a magnetic gap by forming a regulating groove for the contact width to regulate the contact width of the sliding surface of a magnetic head facing a magnetic recording medium and checking from above a reinforcing glass appearing in the side face of the regulating groove. SOLUTION: The regulating groove 14 for the contact width is formed to have the side face 14a as a slope in such a manner that the reinforcing glass 18 appearing in the side face of the regulating groove 14 for the contact width can be checked from above the magnetic head 1, namely from the sliding surface 16 of the magnetic head. The side face 14a of the groove 14 formed as a slope is made deeper than the depth Dp of the magnetic gap(g). The side face 14a of the groove 14 is preferably formed to have 20 to 60 deg. inclined angle α from the sliding surface 16. If the angle α is <20 deg., a magnetic recording medium may touch the slope 14. If the angle α exceeds 60 deg., the top position of the glass 18 is hardly checked from above and thereby, the position of the gap(g) is hardly recognized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a VTR (video tape recorder), a digital data recorder, a DA.
The present invention relates to a laminated magnetic head useful for a magnetic recording / reproducing apparatus such as a T (digital audio tape recorder) and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a magnetic recording and reproducing apparatus such as a VTR or DAT which uses a magnetic tape or the like as a magnetic recording medium, reads an information signal recorded on the magnetic recording tape, or uses the magnetic recording tape. For recording, a magnetic head is provided for reading and reproducing information signals from the signal recording surface of the magnetic recording tape and writing and recording the information signals on the signal recording surface of the magnetic recording tape.

The magnetic head is composed of a magnetic core and a member such as a coil wound around the magnetic core, and a magnetic gap having a minute interval is formed in the magnetic core. The coil serves to transmit an information signal for recording or reproduction as a magnetic flux to the magnetic core. The magnetic core also functions as a passage for transmitting a magnetic flux from the coil to the magnetic recording medium during recording and from the magnetic recording medium to the coil during reproducing. The magnetic gap functions to narrow the spread of the magnetic field in order to record an information signal on the magnetic recording medium, and also functions as a magnetic flux inlet from the magnetic recording medium during reproduction.

By the way, in recent years, in a magnetic recording and reproducing apparatus such as a VTR or DAT which uses a magnetic tape as the above-mentioned magnetic recording medium, the image quality of recording or reproducing a video signal or the like and the increase of recording capacity are increased. For the purpose of enabling to record and reproduce more information signals,
Information signals are being recorded at shorter wavelengths, and in response to this, so-called metal tapes in which ferromagnetic powder is used as magnetic powder and coated on a base film, or ferromagnetic metal materials are directly applied to the base film. A high coercive force magnetic recording medium such as a vapor-deposited tape has been used.

On the other hand, in order to make it possible to record on or reproduce from these high coercive force magnetic recording media, the magnetic core material of the magnetic head has a metal magnetic layer having a high magnetic permeability and a high saturation magnetic flux density, for example, A stacked magnetic head using a layer made of a material such as an iron-based alloy, an iron-nickel-based alloy, or an iron-cobalt-based alloy, or a MIG (metal-in-gap) magnetic head has been proposed.

In the laminated magnetic head, a metal magnetic layer is sandwiched by guard materials made of a non-magnetic material to form a magnetic core half body, and the magnetic core half bodies are butted against each other via a gap material, glass fusion or the like. Is a magnetic head formed by joining and integrating with each other.

[0007]

As described above, the laminated magnetic head has a larger number of magnetic recording heads for the purpose of improving the image quality of recording or reproducing video signals or for increasing the storage capacity. In order to record or reproduce an information signal, a method of recording or reproducing with a signal having a shorter wavelength is adopted. In response to this, it is required to reduce the track width of the magnetic head. As the frequency band is widened, the magnetic gap is being narrowed, and a magnetic head having an extremely narrow magnetic gap is required.

In order to meet these demands, in a magnetic head having a narrow magnetic gap, the visibility of the position of the magnetic gap in the magnetic head is reduced due to the narrowing of the magnetic gap, and the magnetic head is rotated by a VTR or the like. When mounting the magnetic head on the drum, there arises a problem that accurate positioning becomes difficult. In particular, this is remarkable in a magnetic head using a noble metal as a gap material forming a magnetic gap, which makes it difficult to mount with high precision, and the workability in mounting is significantly lowered.

In view of the above problems, the present invention provides a magnetic head and a method of manufacturing the magnetic head, which improves the visibility when mounted on a rotating drum or the like and improves workability and productivity during manufacturing. is there.

[0010]

According to the present invention, there is provided a magnetic head comprising:
At least a part of the side surface of the contact width restricting groove that restricts the contact width with the magnetic recording medium is formed as an inclined surface with respect to the sliding surface with the magnetic recording medium, and the reinforcing glass formed in the winding window is It is a configuration that faces the side surface of the contact width regulation groove formed as a slope.

According to the method of manufacturing a magnetic head of the present invention, a step of forming a reinforcing glass in the winding window to join the magnetic core halves, and a groove for controlling the contact width of the magnetic head with the magnetic recording medium. Is formed so that at least a part of its side surface is an inclined surface with respect to the sliding surface with respect to the magnetic recording medium, and the reinforcing glass is exposed to the inclined surface.

According to the above-mentioned structure of the present invention, when the reinforcing glass filled in the winding window faces the side surface of the contact width regulating groove formed as the inclined surface, the magnetic head is mounted on the rotating drum or the like. In addition, the position of the magnetic gap can be accurately and easily determined from above the magnetic head, that is, from the sliding surface of the magnetic head based on the difference in reflectance between the reinforcing glass and the core of the magnetic head.

According to the above-described manufacturing method of the present invention, the position of the magnetic gap can be accurately and easily determined by including the step of allowing the reinforcing glass filled in the winding window to face the contact width regulating groove. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the magnetic head of the present invention, at least a part of the side surface of the contact width regulating groove for regulating the contact width with the magnetic recording medium is formed as an inclined surface with respect to the sliding surface with the magnetic recording medium. The reinforcing glass is formed in the winding window, and the reinforcing glass faces the side surface of the contact width regulation groove formed as a slope.

In the magnetic head of the present invention, in the magnetic head, the inclination angle of the side surface of the contact width regulating groove formed as the inclined surface is selected within the range of 20 ° to 60 ° from the sliding surface. And

In the magnetic head of the present invention, in the above magnetic head, the side surface of the contact width regulating groove formed as the inclined surface is formed to a depth not less than the depth of the magnetic gap.

According to the method of manufacturing a magnetic head of the present invention, a step of forming a reinforcing glass in the winding window to join the magnetic core halves, and a groove for controlling the contact width of the magnetic head with the magnetic recording medium. Is formed so that at least a part of its side surface is an inclined surface with respect to the sliding surface with respect to the magnetic recording medium, and the reinforcing glass is exposed to the inclined surface.

An embodiment of a method of manufacturing a magnetic head according to the present invention will be described below with reference to the drawings.

First, the structure of the laminated magnetic head of this embodiment will be described. FIG. 1 and FIG. 2 show an example of this laminated type laminated magnetic head.

As shown in FIGS. 1 and 2 (a plan view on the sliding surface side with the magnetic recording medium of FIG. 1), the laminated magnetic head 17 of this example has a pair of magnetic core halves forming a closed magnetic path. Body 19
a and 19b are butted and joined together to form a magnetic gap g facing the sliding surface 16 with the magnetic recording medium.

In the magnetic core halves 19a and 19b, the metal magnetic layer 2 has a nonmagnetic substrate (nonmagnetic guard material) 1 on both sides thereof.
It is sandwiched by each.

Then, the magnetic core halves 19a and 19b
At the abutting end faces of each other, the ends of the metal magnetic layers 2 are abutted to form a magnetic gap g between the abutting end faces. The track width Tw of the magnetic gap g is set by the film thickness of the metal magnetic layer 2 because the nonmagnetic substrate 1 is nonmagnetic.

Magnetic head sliding surface 1 in contact with the magnetic recording medium
6 is regulated by a contact width regulation groove 14 which regulates the contact width when sliding on the magnetic recording medium. The contact width regulation groove 14 is formed in parallel with the metal magnetic layer 2 in the portion which becomes the magnetic head sliding surface 16.

A winding window 12 for restricting the depth Dp of the magnetic gap g and winding a coil is formed on the abutting surfaces of the magnetic core halves 19a and 19b, and the winding window 12 slides. A so-called top portion on the surface 16 side and a rear portion opposite to the magnetic gap g are filled with a reinforcing glass 18. The reinforcing glass 18 is formed so as to face the side surface of the contact width restricting groove 14 that restricts the contact width when sliding on the magnetic recording medium.

Then, the reinforcing glass 18 facing the side surface of the contact width restricting groove 14 can be seen above the magnetic head 1, that is, from the sliding surface 16 of the magnetic head, so that the contact width restricting groove 1 can be seen.
The four side surfaces 14a are formed as slopes. At this time, the side surface 14a of the contact width regulation groove 14 formed as this slope is formed deeper than the depth Dp of the magnetic gap g. Further, as shown in the cross-sectional view of the main part of the magnetic head in FIG. 3, the side surface 14a of the contact width regulating groove 14 formed as this inclined surface preferably has an inclination angle α from the sliding surface 16 of 20 ° to 60 °. Formed to be within the range of °. In the conventional magnetic head, the inclination angle α = 90
°. If the inclination angle α is less than 20 °, the magnetic recording medium may hit the slope 14a on the side surface of the width regulation groove 14. On the other hand, when the inclination angle exceeds 60 °, it becomes difficult to determine the tip position of the reinforcing glass 18 when looking at the magnetic head from above, and it becomes difficult to identify the position of the magnetic gap g.

On the other hand, on the outer surface of the magnetic core halves 1 and 2, for example, a winding guide groove 15 having a substantially U-shaped cross section for ensuring the winding state of the coil wound in the winding groove 19 described above. Is provided.

As the material of the metal magnetic layer 2, a ferromagnetic alloy material having a high saturation magnetic flux density and excellent soft magnetic characteristics is used in addition to various ferromagnetic materials. As the magnetic alloy material, known materials can be used regardless of whether the alloy is crystalline or amorphous.

For example, Fe-Al-Si, Fe-Si-
Co, Fe-Ni, Fe-Ga-Ge, Fe-Ga-S
i, Fe-Al-Ge, Fe-Si-Ga-Ru, Fe
-Co-Si-Al based alloys, and in order to improve their corrosion resistance and wear resistance, Ti, Cr, Mn,
Zr, Nb, Ta, W, Ru, Os, Rh, Ir, R
The material may be one or several kinds of e, Ni, Pd, Pt, Hf, V, etc. added.

A ferromagnetic amorphous alloy, a so-called amorphous alloy, for example, an alloy composed of one or more elements of Fe, Ni and Co and one or more elements of P, C, B and Si , Or Al, Ge, B containing these as main components
e, Sn, In, Mo, W, Ti, Mn, Cr, Zr,
Examples thereof include metal-metalloid type amorphous alloys such as alloys containing Hf and Nb, and metal-metal type amorphous alloys containing transition elements such as Co, Hf and Zr and rare earth elements as main components.

As a method of forming these metal magnetic layers 2,
It is possible to use a vacuum thin film forming technique typified by a sputtering method, a vacuum vapor deposition method, an ion plating method, an ion beam method, or the like, which is excellent in controllability of the film thickness.

The metallic magnetic layer 2 has a high frequency band.
Eddy current generation and improve head efficiency
For the purpose of the metal magnetic layer 2 and SiO_Two, Al_TwoO_Three, Si
_ThreeN _FourAlternate with electrical insulating film such as oxide or nitride
It is preferable that the metal magnetic laminated film is formed by laminating.

For the non-magnetic substrate 1, a ceramic material having high strength, which is a material in consideration of workability, wear resistance, coefficient of thermal expansion with a metal magnetic material, etc., is desirable.

Next, the manufacturing method of this embodiment will be described. As shown in FIG. 4, a strip-shaped non-magnetic substrate 1 serving as a non-magnetic guard material having both main surfaces mirror-finished is prepared, and one main surface of the non-magnetic substrate 1 is provided with a vacuum thin film such as a sputtering method. The core substrate 20 formed by depositing the metal magnetic layer 2 is formed by the forming method.

Next, as shown in FIG. 5, a plurality of core substrates 20 are superposed on each other at a predetermined azimuth angle via a bonding material, and these are pressure-fixed and heat-treated to integrally bond them to form a bonded substrate 3. To form.

This bonded substrate 3 is referred to as AA ', B- in FIG.
By cutting along the cross sections indicated by B'and CC 'in FIG.
2 magnetic core half blocks 4 and 5
Get.

Next, as shown in FIG. 7, the magnetic core halves 5a at both ends of one magnetic core half block 5 are cut and removed.

Next, as shown in FIG. 8, for the magnetic core half blocks 4 and 5, winding grooves 6 and 7 extending along the longitudinal direction of the magnetic core half blocks 4 and 5, respectively, are approximately U-shaped. It is formed to have a cross-sectional shape. At the same time, glass insertion grooves 8 and 9 are formed on the end faces of the magnetic core half blocks 4 and 5 on the side opposite to the side where the magnetic gap g will be formed later (that is, the bottom face in FIG. 7).

Then, the surfaces on which the grooves 6, 7, 8 and 9 are formed are smooth-polished, and a gap material made of a noble metal such as gold is formed on the polished surface by a vacuum thin film forming method such as sputtering.

Next, as shown in FIG. 9, the two magnetic core half blocks 4 and 5 are butted so that the respective metal magnetic layers 2 face each other with the gap material interposed therebetween. Then, the glass rods 10 and 11 are inserted and arranged in the winding grooves 6 and 7 and the glass insertion grooves 8 and 9, respectively, and the glass rods 10 and 11 are melted to lower the glass rods 10 and 11 and the glass. Reinforcing glass 18 filled in the insertion grooves 8 and 9
Then, the two magnetic core half blocks 4 and 5 are integrally joined. At this time, the magnetic core halves 4a at both ends of the one magnetic core half block 4 do not have the magnetic core halves to be joined, and the magnetic core halves 4a are formed so as to protrude to both ends. It

As a result, a magnetic core block 13 having a magnetic gap g that operates as a recording / reproducing gap is formed between the abutting end faces of the metal magnetic layers 2 formed on the magnetic core half blocks 4 and 5, respectively. It A winding window 12 is formed by the winding grooves 6 and 7.

Then, as shown in FIG. 10, a sliding surface 16 with the magnetic recording medium having a required curvature is formed on the outer surface of the magnetic core block 13 by lapping or the like. At this time, the sliding surface 16 is formed so as to have a predetermined depth Dp while measuring the depth Dp by using the protruding magnetic core halves 4a at both ends.

Further, as shown in FIG. 11, a winding guide groove 15 is formed in the portion of the outer surface of the magnetic core block 13 where the winding is applied.

Next, the contact width regulating groove 14 for regulating the contact width to the magnetic recording medium is formed on the sliding surface 16. At this time, as shown in FIG. 12, the side surface 14a of the contact width regulating groove 14 has the inclination angle α of a predetermined angle from the sliding surface 16 as described above, and the reinforcing glass 18 faces the side surface 14a. Cut so that it can be seen from above. 12, A is a front view of the magnetic head 17, B is a side view seen from the side of the magnetic head 17, and C is a plan view seen from the sliding surface 16 side.

After that, FF ', G indicated by the dotted line in FIG.
The magnetic core halves 19a, 19b in which the magnetic core block 13 is cut along the surface along the line -G 'and the metal magnetic layer 2 is sandwiched between the non-magnetic substrates 1 as shown in FIGS.
Are abutted, a magnetic gap g is formed between the abutting end faces, and the reinforcing glass 18 faces the side surface of the contact width regulating groove 14 with the magnetic recording medium.
Get.

According to the embodiment described above, the reinforcing glass 18
The side surface 14 of the contact width regulation groove 14 formed as a slope
By seeing the reinforcing glass 18 from above the magnetic head sliding surface 16 when facing a, it is possible to know the position of the reinforcing glass 18 by the difference in reflectance with respect to the incident light between the core of the magnetic head and the reinforcing glass 18, for example. Therefore, the position of the magnetic gap can be determined and the mounting can be performed accurately.

As a joining method in each step, a conventionally known joining method, for example, low temperature thermal diffusion joining by heat diffusion of noble metal layers or glass fusion can be used.

The magnetic head of the present invention is not limited to the above-mentioned example, and various other configurations can be adopted without departing from the gist of the present invention.

[0048]

According to the magnetic head and the manufacturing method thereof according to the present invention described above, when the contact width restricting groove for restricting the contact width of the sliding surface of the magnetic head with the magnetic recording medium is formed, the contact width restriction is regulated. By making it possible to confirm the reinforcing glass facing the side surface of the groove from above the sliding surface of the magnetic head,
The position of the magnetic gap can be accurately and easily determined, and the magnetic gap can be mounted on a rotating drum or the like with high accuracy. As a result, workability and productivity can be improved, the number of steps can be reduced, and the manufacturing cost can be reduced to manufacture the magnetic head.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a laminated magnetic head of the present invention.

FIG. 2 is an enlarged front view of a sliding surface of the magnetic head of FIG. 1 with respect to a magnetic recording medium.

FIG. 3 is a cross-sectional view of a sliding surface and a vertical surface of the magnetic head of FIG.

FIG. 4 is a process diagram showing one example of a manufacturing process of a method of manufacturing a magnetic head according to the present invention.

FIG. 5 is a process chart showing one example of a manufacturing process of a method for manufacturing a magnetic head of the present invention.

FIG. 6 is a process diagram showing one example of a manufacturing process of a method of manufacturing a magnetic head according to the present invention.

FIG. 7 is a process chart showing an example of a manufacturing process of a method of manufacturing a magnetic head according to the present invention.

FIG. 8 is a process diagram showing one example of a manufacturing process of a method for manufacturing a magnetic head of the present invention.

FIG. 9 is a process diagram showing one example of a manufacturing process of a method of manufacturing a magnetic head according to the present invention.

FIG. 10 is a process chart showing one example of a manufacturing process of a method for manufacturing a magnetic head of the present invention.

FIG. 11 is a process chart showing an example of the manufacturing process of the magnetic head according to the present invention.

12A, 12B, 12C and 12D are process diagrams showing an example of a manufacturing process of a method of manufacturing the magnetic head of the present invention.

[Explanation of symbols]

1 non-magnetic substrate (non-magnetic guard material), 2 metal magnetic layer,
3 bonded substrates, 4, 5 magnetic core half blocks, 4a, 5
a magnetic core half body, 6,7 winding groove, 8,9 glass insertion groove, 10,11 glass rod, 12 winding window, 13 magnetic core block, 14 contact width regulating groove, 15 winding guide groove, 16 sliding Moving surface, 17 magnetic head, 18 reinforced glass, 19a, 19b magnetic core half body, 20, 21 core substrate, Tw track width, g magnetic gap, Dp
Depth

Claims (4)

[Claims] 1. A reinforcing glass is provided in a winding window in which at least a part of a side surface of a contact width restricting groove for restricting a contact width with a magnetic recording medium is formed as an inclined surface with respect to a sliding surface with the magnetic recording medium. A magnetic head, wherein the reinforcing glass is formed so as to face a side surface of the contact width regulating groove formed as the slope. 2. The inclination angle of the side surface of the contact width regulating groove formed as the inclined surface is selected within a range of 20 ° to 60 ° from the sliding surface. Magnetic head. 3. The magnetic head according to claim 1, wherein a side surface of the contact width regulation groove formed as the inclined surface is formed to a depth equal to or larger than the depth of the magnetic gap. 4. A step of forming a reinforcing glass in the winding window to join the magnetic core halves, and a groove for restricting a contact width of the magnetic head with the magnetic recording medium, at least a part of a side surface thereof. Is formed so as to be inclined with respect to the sliding surface with respect to the magnetic recording medium, and the reinforcing glass is exposed to the inclined surface.