JPH09180115A - Manufacture of magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability and to improve the productivity of magnetic head by eliminating the need of a take-out process from a magnetic core half body block jig and a cutting process of both end magnetic core half bodies. SOLUTION: First of all, plural sheets of core substrates 20-21 having a metal magnetic layer formed on the surface of a non-magnetic substrate are joined, and a joint substrate 3 joined alternately leaving the parts not joined at the width of the magnetic core half body blocks whose both end core substrates 21 are cut thereafter is formed. Then, the joint substrate 3 is cut, and a first magnetic core half body block with both end core substrates 21 joined and a second magnetic core half body block having no both end core substrates 21 are formed. Thereafter, the first magnetic core half body block is joined with the second magnetic core half body block, and a magnetic gap is formed between the butting end surfaces of the metal magnetic layer, and the magnetic head is manufactured.

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 method for manufacturing a laminated magnetic head useful for a magnetic recording / reproducing apparatus such as a T (digital audio tape recorder).

[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 and joined together by glass fusion or the like. It is a configured magnetic head.

As the above-mentioned laminated magnetic head, there is a so-called laminate type magnetic head having a structure in which a metal magnetic layer having a high magnetic permeability and a high saturation magnetic flux density is sandwiched between a substrate (guard material) made of a non-magnetic material. Are known.

The conventional laminated magnetic head has been manufactured as follows.

First, as shown in FIG. 9, a strip-shaped non-magnetic substrate 5 serving as a non-magnetic guard material having both principal surfaces mirror-polished.
1 is prepared, and a core substrate 70 is formed by forming a metal magnetic layer 52 on one main surface of the non-magnetic substrate 51 by a vacuum thin film forming method such as a sputtering method.

Next, as shown in FIG. 10, a plurality of core substrates 70 are superposed on each other, fixed under pressure, heat-treated, and joined together to form a joined substrate 53.

This bonded substrate 53 is referred to as AA in FIG.
1 ', B-B', C-C '
As shown in FIG. 1, a pair of magnetic core half blocks 54 and 55 which are substantially symmetrical to each other are produced.

Next, as shown in FIG. 12, winding grooves 56 and 57 extending along the longitudinal direction of the magnetic core half blocks 54 and 55, respectively, are formed on the magnetic core half blocks 54 and 55 so as to be substantially co-shaped. It is formed to have a V-shaped cross section. At the same time, in the magnetic core half blocks 54, 55,
Later, glass insertion grooves 58 and 59 are formed on the end surface (that is, the bottom surface in FIG. 12) opposite to the side on which the magnetic gap g is formed.

Next, as shown in FIG. 13, one magnetic core half block 55 is provided with core substrates 70 at both ends thereof.
The magnetic core half body 55a corresponding to one sheet of
Then, the magnetic core halves 55a at both ends are removed from the magnetic core half block 55 by cutting along the planes indicated by EE 'and EE'.

Next, as shown in FIG. 14, the two magnetic core half blocks 54 and 55 are butted so that the metal magnetic layers 52 face each other with a gap material interposed therebetween, and the winding grooves 56, 57 and glass insertion grooves 58, 5
Glass rods 60 and 61 are inserted and arranged in 9 respectively,
The glass rods 60 and 61 are melted to form the winding groove 5 in the figure.
The lower part of 6, 57 and the glass insertion grooves 58, 59 are filled with the reinforcing glass 68 to join and integrate the two magnetic core half blocks 54, 55.

As a result, a magnetic core block 63 having a magnetic gap g acting as a recording / reproducing gap is formed between the abutting end faces of the metal magnetic layers 52 formed on the magnetic core half blocks 54 and 55, respectively. It A winding window 62 is formed by the winding grooves 56 and 57.

At this time, the magnetic core halves 54a at both ends of the magnetic core half block 54 which is not cut in FIG. 13 do not have the magnetic core halves to be joined, and the portion of the magnetic core halves 54a does not exist. It is formed in a shape protruding to both ends.

Then, as shown in FIG. 15, a sliding surface 66 with the magnetic recording medium having a required curvature is formed on the outer surface of the magnetic core block 63 by lapping or the like. At this time, the sliding surface 66 is formed so as to have a predetermined depth Dp while confirming the depth Dp by utilizing the protruding magnetic core halves 54a at both ends.

Further, as shown in FIG. 16, a winding guide groove 65 is formed in the portion of the outer surface of the magnetic core block 63 where the winding is applied. Further, on the sliding surface 66, a contact width regulation groove 64 for contacting the magnetic recording medium is formed.

After that, FF 'and GG shown by dotted lines in the figure
The magnetic core half body 6 in which the magnetic core block 63 is cut on the surface along each line of ‘′ and the metal magnetic layer 52 is sandwiched between the nonmagnetic substrates (nonmagnetic guard materials) 51 as shown in FIG.
A magnetic head 67 having a structure in which 9a and 69b are butted and a magnetic gap g is formed between the butted end faces is formed.

[0020]

In the conventional method of manufacturing a laminated magnetic head, as described above, in FIG.
While giving the sliding surface 66 of the magnetic head a predetermined curvature,
In order to measure the depth Dp when lapping up to a predetermined depth Dp, as shown in FIG. 13, the magnetic core halves 55a at both ends of one magnetic core half block 55a are measured.
A step of cutting the was required.

When this step is performed, the winding grooves 56, 57 and the glass insertion grooves 58, 59 are formed in the magnetic core half blocks 54, 55, and then the magnetic core half blocks 54, 55 are temporarily jigged. Then, the magnetic core half block 55 to be cut must be attached again and then cut.

As described above, since the magnetic core half block is once removed from the jig and then attached, there is a problem that the workability is lowered, the number of steps is increased, and the manufacturing cost is increased.

The present invention can improve workability and productivity of magnetic heads by eliminating the steps of removing the magnetic core half block jig and cutting the magnetic core halves at both ends. The present invention provides a method of manufacturing a magnetic head that can be performed.

[0024]

According to the method of manufacturing a magnetic head of the present invention, a plurality of core substrates each having a metal magnetic layer formed on the surface of a non-magnetic substrate are bonded together, and the core substrates at both ends are then cut. A step of forming a joined substrate having portions that are not joined alternately in the width of the magnetic core half block,
A step of cutting the bonded substrate to form a first magnetic core half block having the core substrates bonded at both ends, and a second magnetic core half block having no core substrate at both ends; And a step of joining the magnetic core half block and the second magnetic core half block together to form a magnetic gap between the abutting end faces of the metal magnetic layer.

According to the above-described manufacturing method of the present invention, the step of cutting the magnetic core halves at both ends of the magnetic core half block in order to measure the predetermined depth is eliminated, and the depth measurement can be performed without this step. It can be performed.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic head manufacturing method 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. 8A and 8B show an example of this laminated type laminated type magnetic head.

As shown in FIGS. 8A and 8B (enlarged view of the sliding surface with the magnetic recording medium of FIG. 8A), the laminated magnetic head 17 of this example has a pair of magnetic core halves forming a closed magnetic path. 19a 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. Therefore, the track width Tw of the magnetic gap g is set by the film thickness of the metal magnetic layer 2.

A winding window 12 for restricting the depth Dp of the magnetic gap g and winding the coil is formed on the abutting surfaces of the magnetic core halves 19a and 19b, and the winding window 12 slides. A reinforcing glass 18 is filled on the surface 16 side.

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

The metal 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, it is desirable to use 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, and the like.

Next, the manufacturing method of this embodiment will be described. As shown in FIG. 1, 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. 2, a plurality of core substrates 20 are superposed on each other with a predetermined azimuth angle therebetween via a bonding material, and these are pressure-fixed and heat-treated to integrally bond the bonded substrates 3. To form.

When forming the bonded substrate 3, a plurality of core substrates 20 are superposed on each other with a bonding material interposed therebetween, and on both sides thereof, the bonded surfaces 25 are bonded alternately with the width of the magnetic core half block to be cut thereafter. A similar core substrate 21 on which a bonding material 30 is applied by masking so that the material 30 does not adhere is superposed, then fixed under pressure and heat-treated to be integrated.

As a result, the bonding material does not adhere to the masked portion, and as shown in FIG.
A joint substrate 3 is obtained in which the portions having the bonding material 30 and the portions having no bonding material 30 are alternately formed between the core substrates 21 on both ends and the adjacent core substrate 20.

This bonded substrate 3 is referred to as H-H ', J- in FIG.
By cutting at the cross sections indicated by J ′ and KK ′, that is, at the boundary between the portion having the bonding material 30 and the portion not having the bonding material 30, as shown in FIG. And get 5.

At this time, one magnetic core half block 5
With regard to, since the bonding material 30 is not provided between the magnetic core halves 5a at both ends and the adjacent magnetic core halves 5b,
The magnetic core halves 5a at both ends are easily peeled off and the cutting step shown in FIG. 13 can be omitted.

Next, as shown in FIG. 4, winding grooves 6 and 7 extending along the longitudinal direction of the magnetic core half blocks 4 and 5 are formed on the magnetic core half blocks 4 and 5, respectively. It is formed to have a V-shaped cross section. 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 two magnetic core half blocks 4 and 5 are butted so that the respective metal magnetic layers 2 face each other via the gap material. At this time, the magnetic core halves 4a at both ends of one magnetic core half block 4 are
Is formed such that there is no magnetic core half body to be joined, and the magnetic core half body 4a protrudes at both ends.

Next, as shown in FIG. 5, 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, In the drawing, the lower part of the winding grooves 6 and 7 and the glass insertion grooves 8 and 9 are filled to form a reinforcing glass 18, and the two magnetic core half blocks 4 and 5 are joined and integrated.

As a result, a magnetic core block 13 having a magnetic gap g which 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. 6, 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, by utilizing the protruding magnetic core halves 4a at both ends,
While measuring the depth Dp, the sliding surface 16 is formed so as to have the predetermined depth Dp.

Further, as shown in FIG. 7, a winding guide groove 15 is formed on the outer surface of the magnetic core block 13 where the winding is to be formed. Further, the contact width regulation groove 14 for contacting the magnetic recording medium is formed on the sliding surface 16.

After that, FF 'and GG shown by dotted lines in the figure
Magnetic core halves 19a and 19b in which the magnetic core block 13 is cut along the planes along each line of ′ and the metal magnetic layer 2 is sandwiched between the non-magnetic substrates 1 as shown in FIGS. 8A and 8B.
Are abutted to each other, and the intended laminated magnetic head 17 in which the magnetic gap g is formed between the abutting end faces is obtained.

According to the above-described embodiment, when the bonding substrate 3 is formed, as shown in FIG.
The bonding substrate 3 is formed by masking 1 to the bonding surface 25 so that the bonding material 30 does not alternately adhere to the width of the core block half to be cut thereafter. 2, H-H ', JJ', K
When cut at the cross section indicated by -K ', that is, at the boundary between the portion having the bonding material 30 and the portion not having the bonding material 30, the magnetic core halves 5a at both ends of the one magnetic core half block 5 are easily formed. Then, the cutting step shown in FIG. 13 can be omitted.

Even if the cutting step is omitted, the depth Dp can be measured in the magnetic core halves at both ends of the magnetic core half block 23 in which the magnetic core halves at both ends remain. The manufacturing process can be simplified.

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, glass fusion or the like can be used.

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

[0056]

According to the method of manufacturing a magnetic head of the present invention described above, when lapping a sliding surface having a predetermined curvature up to a predetermined depth, the depth of the magnetic core half at both ends can be measured. Improves workability by enabling depth measurement without the need for a pre-cutting step
The magnetic head can be manufactured by reducing the number of steps and manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a process chart showing an example of a manufacturing process of an example of a method for manufacturing a magnetic head of the present invention.

FIG. 2 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. 3 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. 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.

8A is a perspective view of an example of a laminated magnetic head to which the manufacturing method of the present invention is applied. FIG. 8B is an enlarged front view of the sliding surface of the magnetic head of FIG. 8A with respect to the magnetic recording medium. FIG.

FIG. 9 is a process drawing showing one manufacturing process of a conventional magnetic head manufacturing method.

FIG. 10 is a process chart showing a manufacturing step of a conventional magnetic head manufacturing method.

FIG. 11 is a process drawing showing one manufacturing process of a conventional magnetic head manufacturing method.

FIG. 12 is a process drawing showing one manufacturing process of a conventional magnetic head manufacturing method.

FIG. 13 is a process chart showing one manufacturing process of a conventional magnetic head manufacturing method.

FIG. 14 is a process chart showing one manufacturing process of a conventional magnetic head manufacturing method.

FIG. 15 is a process diagram showing one manufacturing process of a conventional magnetic head manufacturing method.

FIG. 16 is a process chart showing one manufacturing process of a conventional magnetic head manufacturing method.

FIG. 17 is a perspective view of an example of a laminated magnetic head.

[Explanation of symbols]

 1, 51 Non-magnetic substrate (non-magnetic guard material) 2, 52 Metal magnetic layer 3, 53 Bonding substrate 4, 5, 54, 55 Magnetic core half block 4a, 5a, 54a, 55a Magnetic core half 6, 7, 56, 57 Winding groove 8, 9, 58, 59 Glass insertion groove 10, 11, 60, 61 Glass rod 12, 62 Winding window 13, 63 Magnetic core block 14, 64 Width regulation groove 15, 65 Winding guide Grooves 16, 66 Sliding surfaces 17, 67 Magnetic heads 18, 68 Reinforced glass 19a, 19b, 69a, 69b Magnetic core halves 20, 21, 70 Core substrate 25 Bonding surface 30 Bonding material Tw Track width g Magnetic gap Dp depth

Claims (1)

[Claims] 1. A plurality of core substrates, each having a metal magnetic layer formed on the surface of a non-magnetic substrate, are joined together, and the core substrates at both ends are formed into portions which are not joined alternately by the width of a magnetic core half block to be cut thereafter. A step of forming a bonded bonded substrate having, a first magnetic core half block to which the core substrates at both ends are bonded by cutting the bonded substrate, and a core substrate at both ends Forming a second magnetic core half block, joining the first magnetic core half block and the second magnetic core half block, and forming a magnetic gap between the abutting end faces of the metal magnetic layer. A method of manufacturing a magnetic head, comprising: