JPH0817007A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To realize a magnetic head which is arranged with an alloy thin film having good characteristics and is capable of dealing with a trend toward higher density. CONSTITUTION:A recessed groove 2 is worked and formed on a gap line which is a surface to act as a head sliding surface of a magnetic material block 1. The alloy thin film 3 essentially consisting of Fe is deposited by a sputtering method on this recessed groove 2. Glass 4 is melted into the recessed groove 2 deposited with the alloy thin film 3 and the surface thereof is lapped down to a prescribed position. After the magnetic material block 1 is cut to two; a core half body 5a and a core half body 5b, grooves 6 for regulating a track width are formed by machining. Glass 7 is melted in these grooves 6 and the gap surface melted with the glass 7 is lapped down to the prescribed position. Next, a winding groove 8 is formed at the core half body 5a and a gap material is disposed between the core half body 5a and the core half body 5b to form a gap; thereafter, the assembly is cut to one head chip 9A each. The sliding surfaces of these chips are rounded by polishing. The alloy thin film 3 is formed in a horizontal direction on the head sliding surface.

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 VTR or the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art Recently, in a magnetic recording / reproducing apparatus such as a VTR, a high density recording is required, and accordingly, a magnetic tape has a high coercive force and a head having a high saturation magnetic flux density is required. In conventional home-use VTRs, ferrite heads have been replaced with metal heads, and in particular, MIG (Metal-In-Gap) from the viewpoint of low cost.
The head is the mainstream.

FIG. 4 shows a manufacturing process of a conventional MIG head. This conventional manufacturing method uses magnetic blocks as the core halves 10a and the core halves 10b shown in FIG. 4 (a), and as shown in FIG. 4 (b), the core halves 10a, 10b are used.
The alloy thin film 3'is formed on the surface which will be the gap surface by sputtering. This film thickness is about 2 to 20 μm. Next, as shown in FIG.
Grooves 6 for track regulation are formed on the gap surfaces of a and 10b. Next, as shown in FIG. 4D, the glass 7 is melted in the track regulating groove 6. Next, as shown in FIG. 4 (e), the core half body 10 which is one of the magnetic blocks.
A groove 8 for winding is formed in a. Next, as shown in FIG. 4F, a gap material (not shown) is arranged between the core halves 10a and the core halves 10b to form the gap G, and then each head chip It is cut to 9 and the head sliding surface is R-polished to complete. Note that FIG. 4F is an enlarged view of the head sliding surface.

The alloy thin film 3'in this conventional magnetic head is arranged vertically from the front to the back of the head chip 9. As one example thereof, Japanese Patent Laid-Open No. 4-55143
For example, those described in Japanese Patent Publication.

[0005]

[Problems to be Solved by the Invention] However, the conventional MIG
In the head, the magnetic permeability in the thickness direction of the alloy thin film 3'formed by the sputtering method affects the head characteristics, and the magnetic permeability in this direction is difficult to measure. Normal,
The magnetic permeability of the thin film is measured in the horizontal longitudinal direction with respect to the sputtering surface. That is, in the structure of the conventional MIG head, since it is difficult to obtain the correlation between the magnetic permeability of the material and the head characteristics, the alloy thin film 3'having good characteristics cannot be arranged, and there is a problem in dealing with high density.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head which can be arranged with an alloy thin film having good characteristics and can cope with high density, and a method of manufacturing the same in consideration of the above problems.

[0007]

The magnetic head according to claim 1 is characterized in that an alloy thin film is formed in the horizontal direction with respect to the head sliding surface in the vicinity of the gap between the head sliding surfaces of the two core halves. And A method of manufacturing a magnetic head according to claim 2, wherein a step of forming a concave groove on a gap line of a surface which becomes a head sliding surface of the magnetic body block, a step of forming an alloy thin film in the concave groove by a sputtering method, Melting glass on the alloy thin film and lapping the surface to a predetermined position;
A step of cutting the magnetic block into two core halves by a gap line, a step of forming a track width regulating groove on the cut surface of the two core halves, and a track width regulating groove Melting glass and lapping the surface to a predetermined position, forming a winding groove in one of the two core halves, one core half having the winding groove and the other core half The process includes a step of forming a gap by providing a gap material with the body, and a step of cutting the two core halves having the gap into head chips and polishing the head sliding surface.

A method of manufacturing a magnetic head according to claim 3 is
A step of forming a plurality of concave grooves on the surface of the magnetic block that becomes the head sliding surface perpendicular to the gap line, a step of forming an alloy thin film in the plurality of concave grooves by a sputtering method, and melting glass on the alloy thin film. Then, a step of lapping the surface to a predetermined position, a step of cutting the magnetic body block into two by a gap line to form two core halves, and a groove for track width regulation on the cut surfaces of the two core halves. Forming the winding groove, melting the glass in the track width regulating groove and lapping the surface to a predetermined position, forming the winding groove in one of the two core halves, and A step of arranging a gap material between one of the formed core halves and the other of the formed core halves to form a gap, and cutting the two core halves having the gap into head chips to form a head sliding surface. Including the step of polishing .

A method of manufacturing a magnetic head according to a fourth aspect is
A step of forming a plurality of concave grooves on the surface of the magnetic block that becomes the head sliding surface in an oblique direction with respect to the gap line, a step of forming an alloy thin film in the plurality of concave grooves by a sputtering method, and a step of forming an alloy thin film on the alloy thin film. Melting glass and lapping the surface to a predetermined position, cutting the magnetic block into two with a gap line to form two core halves, and controlling track width on the cut surface of the two core halves Forming a groove for use in the track, a step of melting glass in the groove for limiting track width and lapping the surface to a predetermined position, a step of forming a winding groove in one of the two core halves, A step of arranging a gap material between one core half body in which the line groove is formed and the other core half body to form a gap, and two core half bodies in which the gap is formed are cut into a head chip and a head slide is performed. And the process of polishing the moving surface Which comprise.

[0010]

According to the present invention, the alloy thin film is formed in the vicinity of the gap of the head sliding surface in the horizontal direction with respect to the head sliding surface, and is perpendicular to the head sliding surface like the conventional MIG head. This is completely different from the direction in which the alloy thin film was formed. Usually, the magnetic permeability, which is a characteristic of the thin film, is measured in the horizontal direction with respect to the film-attached surface, and therefore the material characteristic directly affects the magnetic permeability of the head. In other words, since the horizontal direction to the head sliding surface is the direction in which the magnetic permeability of the alloy thin film is measured, the characteristics of the material are likely to match the characteristics of the head, and the alloy thin film having good characteristics can be arranged. Further, since the magnetic permeability in this direction is high, the electromagnetic conversion characteristics when combined with a magnetic tape are also high.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. FIG. 1 is a process chart showing a method of manufacturing a magnetic head according to a first embodiment of the present invention. First, as shown in FIG. 1A, a groove 2 is formed on the gap line of the surface of the magnetic block 1 made of ferrite, which becomes the head sliding surface. Next, as shown in FIG. 1B, an alloy thin film 3 containing Fe as a main component is deposited on the groove 2 by a sputtering method. Next, as shown in FIG. 1C, the alloy thin film 3
The glass 4 is melted in the recessed groove 2 formed with, and the surface thereof is lapped to a predetermined position.

Next, as shown in FIG. 1 (d), the magnetic block 1 is cut into two pieces, that is, a core half 5a and a core half 5b by a gap line, and then, as shown in FIG. 1 (e). The grooves 6 for restricting the track width are cut on the core halves 5a and 5b. Next, as shown in FIG.
The glass 7 is melted in the groove 6 for controlling the track width, and the glass 7
Lapping the melted gap surface to a predetermined position.

Next, as shown in FIG. 1 (g), the winding groove 8 is formed in the core half 5a. At this time, the core half 5a
In order to secure the front depth (gap depth) GD, the contact points (apex) A between the winding groove 8 and GD are made to coincide with each other. Next, as shown in FIG.
After a gap material (not shown) is arranged between the core halves 5a and 5b to form a gap, each head chip 9A is cut, and the sliding surface is R-polished.

FIG. 1 (i) is an enlarged view of FIG. 1 (h) viewed from the head sliding surface, and G is a gap. The structure seen from the head sliding surface is the same as the conventional magnetic head,
The forming direction of the alloy thin film 3 is different from the conventional one. That is, the magnetic head of this embodiment has two core halves 5a,
The alloy thin film 3 is formed in the vicinity of the gap of the head sliding surface 5b in the horizontal direction with respect to the head sliding surface. The alloy thin film 3 is arranged only between the head sliding surface and the front depth GD.

The magnetic head manufactured according to the first embodiment was combined with a magnetic tape to measure its characteristics. It was confirmed that the recording / reproducing output of the head when the relative speed was 5.8 m / s and the frequency was 10 MHz was 1 dB higher than that of the conventional head. Next, the second embodiment will be described.
2A to 2D are process drawings showing a method of manufacturing a magnetic head according to a second embodiment of the present invention.

First, as shown in FIG. 2A, a plurality of concave portions are formed on the surface of the magnetic block 1 made of ferrite, which is to be the head sliding surface, in parallel to the track forming direction (perpendicular to the gap line). The groove 2'is processed and formed. Next, FIG.
As shown in (b), an alloy thin film 3 containing Fe as a main component is deposited on the groove 2'by a sputtering method. Next, as shown in FIG. 2 (c), the glass 4 is melted in the concave groove 2'on which the alloy thin film 3 is deposited, and the surface thereof is lapped to a predetermined position.

Next, as shown in FIG. 2 (d), after the magnetic block 1 is cut into two pieces, that is, the core half 5a and the core half 5b by the gap line, as shown in FIG. 2 (e). The grooves 6 for restricting the track width are cut on the core halves 5a and 5b. Next, as shown in FIGS. 2F and 2G, the glass 7 is melted in the track width regulating groove 6,
After lapping the gap surface obtained by melting the glass 7 to a predetermined position, the winding groove 8 is formed in the core half body 5a. At this time, the core half 5a is arranged so that the contact points A (apex) between the winding grooves 8 and GD are aligned with each other so as to secure the front depth GD. After that, a gap material (not shown) is arranged between the core half body 5a and the core half body 5b to form a gap G, which is further cut into one head chip,
R-polish the sliding surface to the position indicated by the curve R.

In FIG. 2 (h), the head chip 9B is cut into R
FIG. 6 is an enlarged view of the polished product as seen from the head sliding surface, in which the direction of forming the alloy thin film 3 is different from that of the conventional magnetic head. That is, the magnetic head of this embodiment has two core halves 5.
The alloy thin film 3 is formed on the head sliding surfaces of a and 5b (including the vicinity of the gap) in the horizontal direction with respect to the head sliding surface. The alloy thin film 3 is arranged only between the head sliding surface and the front depth GD as in the first embodiment.

The magnetic head manufactured according to the second embodiment was combined with a magnetic tape to measure its characteristics. It was confirmed that the recording / reproducing output of the head when the relative speed was 5.8 m / s and the frequency was 10 MHz was 1 dB higher than that of the conventional head. Next, a third embodiment will be described.
FIG. 3 is a process drawing showing a method of manufacturing a magnetic head according to a third embodiment of the present invention.

First, as shown in FIG. 3A, an angle is formed with respect to the track forming direction on the surface which becomes the head sliding surface of the magnetic block 1 made of ferrite (with respect to the gap line). A plurality of recessed grooves 2 ″ are formed by machining. Then, as shown in FIG. 3B, an alloy thin film 3 containing Fe as a main component is deposited on the recessed grooves 2 ″ by a sputtering method. Then, the glass 4 is melted in the groove 2 ″ on which the alloy thin film 3 is deposited, and the surface of the glass 4 is lapped to a predetermined position.

Next, as shown in FIG. 3 (c), the magnetic block 1 is cut into two core halves 5a and 5b by a gap line, and then each of the core halves 5a, 5b is cut.
The groove 6 that regulates the track width is machined in b and the groove 6
Then, the glass 7 is melted on the first half, and the gap surface where the glass 7 is melted is lapped to a predetermined position, and then a winding groove (not shown) is formed on the core half body 5a to form the core half body 5a and the core half body 5b. A gap material (not shown) is arranged between the two to form the gap G. In addition, the core half 5a in which the winding groove is formed
In the same manner as in FIGS. 1 and 2, the contact points A (apex) between the winding groove and GD are aligned so that the front depth GD can be secured. Further, each head chip is cut and the sliding surface is R-polished.

In FIG. 3 (d), the head chip 9C is cut into R
FIG. 6 is an enlarged view of the polished product as seen from the head sliding surface, in which the direction of forming the alloy thin film 3 is different from that of the conventional magnetic head. That is, the magnetic head of this embodiment has two core halves 5.
The alloy thin film 3 is formed in the horizontal direction with respect to the head sliding surface in the vicinity of the gap of the head sliding surface of a and 5b.
The arrangement of the alloy thin film 3 is oblique to the gap line. The alloy thin film 3 is arranged only between the head sliding surface and the front depth GD as in the first and second embodiments.

The magnetic head manufactured according to the third embodiment was combined with a magnetic tape to measure its characteristics. It was confirmed that the recording / reproducing output of the head when the relative speed was 5.8 m / s and the frequency was 10 MHz was 1.5 dB higher than that of the conventional head. As described above, according to the first to third embodiments, the grooves 2, 2 ', 2 "are formed on the surface of the magnetic body block 1 which is the head sliding surface, and the alloy is formed by sputtering on the grooves. By forming the thin film 3, the alloy thin film 3 is formed in the horizontal direction with respect to the head sliding surface, and the alloy thin film is formed in the vertical direction with respect to the head sliding surface as in the conventional MIG head. Normally, the magnetic permeability, which is a characteristic of a thin film, is measured in the horizontal direction with respect to the film deposition surface, so this material property directly affects the magnetic permeability of the head. Is horizontal
Since the magnetic permeability of the alloy thin film 3 is measured, the characteristics of the material easily match the characteristics of the head, and the alloy thin film 3 having excellent characteristics can be arranged. Further, since the magnetic permeability in this direction is high, the electromagnetic conversion characteristics when combined with a magnetic tape are also high.

The front depth portion is occupied by the alloy thin film 3, and the alloy thin film 3 is provided in the vicinity of the gap as in the conventional MIG head, so that it is possible to cope with a tape having a high coercive force. Further, the alloy thin film 3 is arranged only between the head sliding surface and the front depth GD, and since the main core is made of ferrite, eddy current loss is reduced and a magnetic head with high reproduction output can be realized. You can, and the effect is great.

[0025]

As described above, according to the present invention, the alloy thin film is formed in the horizontal direction with respect to the head sliding surface in the vicinity of the gap of the head sliding surface, and the head sliding surface is formed like the conventional MIG head. It is completely different from the case where the alloy thin film was formed in the vertical direction. Usually, the magnetic permeability, which is a characteristic of the thin film, is measured in the horizontal direction with respect to the film-attached surface, and therefore the material characteristic directly affects the magnetic permeability of the head. That is, since the horizontal direction to the head sliding surface is the direction in which the magnetic permeability of the alloy thin film is measured, the characteristics of the material easily match the characteristics of the head,
An alloy thin film having good characteristics can be arranged. Also,
Since the magnetic permeability in this direction is high, the electromagnetic conversion characteristics when combined with a magnetic tape are also high.

The front depth portion is occupied by the alloy thin film, and the structure in which the alloy thin film is arranged in the vicinity of the gap is satisfied as in the case of the conventional MIG head, which makes it possible to cope with a tape having a high coercive force. In addition, the alloy thin film is arranged only between the head sliding surface and the front depth, and since the main core is made of ferrite, eddy current loss is reduced and a magnetic head with high reproduction output can be realized.
The effect is great.

[Brief description of drawings]

FIG. 1 is a process drawing showing a method of manufacturing a magnetic head according to a first embodiment of the present invention.

FIG. 2 is a process drawing showing the method of manufacturing the magnetic head of the second embodiment of the present invention.

FIG. 3 is a process drawing showing the method of manufacturing the magnetic head of the third embodiment of the present invention.

FIG. 4 is a process diagram showing a method of manufacturing a conventional magnetic head.

[Explanation of symbols]

 1 Magnetic Block 2, 2 ', 2 "Groove 3 Alloy Thin Film 4,7 Glass 5a, 5b Core Half 6 Groove for Track Width Control 8 Winding Groove 9A, 9B, 9C Head Chip GD Front Depth A Apex G gap

Claims (4)

[Claims] 1. A magnetic head comprising two core halves each having a gap formed in a head sliding surface, said head halving surface having a gap in a head sliding surface of said two core halves with respect to said head sliding surface. The magnetic head is characterized in that an alloy thin film is formed in the horizontal direction. 2. A step of forming a concave groove on a gap line of a surface which becomes a head sliding surface of a magnetic block, a step of forming an alloy thin film in the concave groove by a sputtering method, and a glass on the alloy thin film. Melting and lapping the surface to a predetermined position; cutting the magnetic block into two along the gap line to form two core halves;
Forming a groove for track width regulation on the cut surfaces of the two core halves; melting glass in the groove for track width regulation and lapping the surface to a predetermined position; A step of forming a winding groove in one of the bodies, a step of forming a gap by providing a gap material between the one core half body in which the winding groove is formed and the other core half body, and A method of manufacturing a magnetic head, comprising the steps of cutting two core halves having a gap into head chips and polishing a head sliding surface. 3. A step of forming a plurality of concave grooves on a surface of a magnetic body block which is a head sliding surface perpendicular to the gap line, a step of forming an alloy thin film in the plurality of concave grooves by a sputtering method, Melting glass on the alloy thin film and lapping the surface to a predetermined position; cutting the magnetic block into two at the gap line to form two core halves; and the two core halves. Forming a groove for controlling the track width on the cut surface, melting the glass in the groove for restricting the track width and lapping the surface to a predetermined position, and winding the glass on one of the two core halves. A step of forming a wire groove, a step of forming a gap by disposing a gap material between one core half body in which the winding groove is formed and the other core half body, and two steps in which the gap is formed. Head half of the core And a method of polishing the head sliding surface. 4. A step of forming a plurality of concave grooves on a surface of a magnetic body block which is a head sliding surface in an oblique direction with respect to a gap line, and a step of forming an alloy thin film in the plurality of concave grooves by a sputtering method. And a step of melting glass on the alloy thin film and lapping the surface thereof to a predetermined position, and cutting the magnetic block into two at the gap line.
Forming two core halves, forming a track width regulating groove in the cut surface of the two core halves, melting glass into the track width regulating groove and lapping the surface to a predetermined position And forming a winding groove in one of the two core halves, and disposing a gap material between the one core half and the other core half in which the winding groove is formed. A method of manufacturing a magnetic head, comprising: a step of forming a gap by means of a step; and a step of cutting the two core halves having the gap into head chips and polishing a head sliding surface.