JPH10255218A - Magnetic head and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize easier control for track width at the time of forming a magnetic gap to improve working efficiency by forming a groove in the width corresponding to a recording track width to the butting surface to form a magnetic gap of a magnetic half body and then filling the groove with a metal magnetic film. SOLUTION: A pair of magnetic core hald bodies 3m, 3n formed of a joined material joining magnetic materials 2m, 2n consisting of magnetic ferrite and non-magnetic material 1m, 1n are but-joined to form a closed magnetic path. In the process before but-joining, grooves 4m, 4n is formed in the size of track width Tw by the grinding process to the butt-joining surface and these grooves are filled, by the sputtering, with metal magnetic films 5m, 5n. After the butt- joining, the surfaces of non-magnetic materials 1m, 1n are polished by the cylindrical polishing method to form a sliding surface 11 with the magnetic recording medium. Therefore, the metal magnetic films 5m, 5n are exposed to the sliding surface 11 to form the high precision recording and reproducing magnetic gap.

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 for, for example, a video tape recorder or data storage, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, short-wavelength recording of information signals has been promoted in magnetic recording and reproducing apparatuses such as VTRs and DATs using a magnetic tape as a magnetic recording medium.
Correspondingly, high coercive force magnetic recording media such as metal tapes and vapor-deposited tapes have been used. In order to perform recording and reproduction of these high coercive force magnetic recording media, a laminated magnetic head using a metal magnetic layer having a high magnetic permeability and a high saturation magnetic flux density as a magnetic core material of the magnetic head, or a metal in gap ( (MIG) type magnetic heads and the like have been proposed.

FIG. 6 shows an example of a conventional metal-in-gap type magnetic head. In this magnetic head 51, the magnetic core halves 52 and 53 are connected to each other via a magnetic gap g formed between the butting surfaces of a pair of magnetic core halves 52 and 53 made of a single crystal ferrite or the like forming a closed magnetic circuit. It is configured to be joined and integrated.

The magnetic gap g is formed facing a sliding surface 56 with the magnetic recording medium, and the sliding surface 56 is formed with a contact width regulating groove 55 for regulating the contact width with the magnetic recording medium. Track width regulating grooves 57 for regulating the width Tw of the recording track are formed on both outer sides of the magnetic gap g.

[0005] The abutting surfaces of the magnetic core halves 52 and 53, that is, the abutting surfaces forming the magnetic gap g, cover the surface of the track width regulating groove 57 in parallel with the forming surface of the magnetic gap g. Thus, a metal magnetic film 54 made of, for example, a soft magnetic alloy is formed.

On the abutting surfaces of the magnetic core halves 52 and 53, a winding groove 58 for restricting the depth of the magnetic gap g and winding the coil is formed. A fusion glass 59 for fusing the magnetic core halves 52 and 53 is filled in the track width regulating groove 57 on the surface 56 side and on the side opposite to the sliding surface 56.

On the side opposite to the sliding surface 56, that is, on the back side, a fusing glass filling groove 61 for filling the fusing glass 59 and fusing the magnetic core half is formed.

On the other hand, on the outer surfaces of the magnetic core halves 52 and 53, for example, a winding guide groove 60 having a substantially U-shaped cross section for securing the winding state of the coil wound in the winding groove 58 described above.
Is provided.

Next, a method of regulating the track width in a magnetic head having a configuration like this magnetic head 51 will be described together with its manufacturing method. First, as shown in FIG. 7A, a plurality of track width regulating grooves 57 are formed at a predetermined pitch on a substrate 71 made of single crystal ferrite or the like. At this time, the track width regulating groove 57 is formed as a slope having a side surface 57s having a certain angle θ with respect to the vertical plane. Further, the protrusion 72 left after the track width regulating groove 57 is dug becomes a magnetic gap surface.

Next, as shown in FIG. 7B, the surface of the projection 72 is mirror-finished. At this time, the track width regulating groove 5
7 has an angle θ with respect to the vertical plane, the track width Tw is controlled in accordance with the thickness dimension change Δd of the protrusion 72 due to mirror finishing.

Next, as shown in FIG. 8C, a metal magnetic film 54 is formed on the surface of the track width regulating groove 57 by a method such as sputtering to form a magnetic core half block 73.

Thereafter, as shown in FIG. 8D, another magnetic core half block 73 manufactured by the same method,
The magnetic core block 74 is formed by adjusting the protrusions 72 constituting the magnetic gap surface so as to overlap each other, and then joining and integrating them. Thus, the recording track width Tw is defined by the overlapping projections 72.

Thereafter, although not shown, the magnetic core block 74 is cut at the portion of the track width regulating groove 57 to be divided into head chips to manufacture the magnetic head 51 having the structure shown in FIG. Can be.

[0014]

However, when the track width Tw is regulated by the above-described method,
The following problems arise.

First, a track width regulating groove 5 due to abrasion of a grindstone 5
7 dimensional change. In order to form the track width regulating groove 57, the substrate 71 is formed by processing with a grindstone. However, since the grindstone wears out during use for a long time, if the cutting process is performed with the same alignment. The dimensions of the track width regulating groove change. Therefore, since the track width Tw also changes, the characteristics of the magnetic head 51 also change.

If the feeding precision of the processing machine for forming the track width regulating groove 57, particularly the pitch feeding precision in the Y-axis direction, that is, the direction substantially perpendicular to the direction of the track width regulating groove 57, is not good, Accumulated errors in feed accuracy have an adverse effect on track alignment, which is one of the causes of an increase in track position deviation.

Further, in the above-described method of regulating the track width Tw, the removal dimension Δd of the mirror-finished surface which is not easily controlled is used.
Since the track width Tw depends on the track width Tw, it is not easy to control the dimension of the track width Tw, and the operation is inefficient.

FIGS. 9A and 9B show enlarged views of a sliding surface of a conventional magnetic head and a part thereof, respectively. For example, in the case where the metal magnetic film 54 is formed by a method such as sputtering, the corners such as the track ends are formed as shown in FIG.
As shown by an arrow a in B, roundness occurs. Since such roundness occurs, the edge portion of the recording track is not clear and the edge portion of the recording pattern on the magnetic recording medium is blurred, which may cause a so-called side fringing phenomenon.

Further, the side surface 57 of the track width regulating groove 57
setting the inclination angle θ of the s
There is a possibility that s affects a signal of an adjacent track on a recording pattern on the magnetic recording medium, that is, a so-called crosstalk phenomenon occurs.

In order to solve the above-mentioned problems, the present invention provides a magnetic head capable of avoiding the occurrence of side fringing and crosstalk and controlling the track width with high precision and ease, and a method of manufacturing the same. Is what you do.

[0021]

According to the present invention, there is provided a magnetic head comprising:
A groove having a width corresponding to the width of the recording track is formed at the recording track forming position on the abutting surface of the magnetic core half where the magnetic gap is formed, and a metal magnetic film is embedded in the groove. It is.

According to the method of manufacturing a magnetic head of the present invention, a step of forming a groove having a width corresponding to the width of a recording track in a bonding substrate in which a non-magnetic material and a magnetic material are bonded, and filling the groove with a metal magnetic film Forming a magnetic core half-block, forming a magnetic core block by abutting a pair of magnetic core half-blocks on the side on which the groove is formed, and forming a groove in the magnetic core block. Having a process of forming a sliding surface with a magnetic recording medium by processing a surface of a non-magnetic material that intersects abutting surfaces of the formed magnetic core half-blocks, and allowing a metal magnetic film in a groove to face the sliding surface. It is.

According to the configuration of the present invention described above, a groove having a width corresponding to the width of the recording track is formed at the recording track forming position, and the metal magnetic film is embedded in the groove, whereby the recording track is formed. Is controlled with high precision. Further, the edge of the recording track can be sharpened.

According to the method of the present invention described above, the width of the recording track is reduced by the metal magnetic film by allowing the previously formed metal magnetic film to face the sliding surface in the groove having a width corresponding to the width of the recording track. A magnetic head defined with high precision can be manufactured.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a magnetic head in which a pair of magnetic core halves are joined and integrated, and a magnetic gap is formed between the butting surfaces of the magnetic core halves. A magnetic head formed with a groove having a width corresponding to the width of a recording track and a metal magnetic film embedded in the groove.

According to the present invention, in the above magnetic head,
The joint of the half of the magnetic core except for the metal magnetic film is composed of a non-magnetic material disposed on the sliding surface side with the recording medium and a magnetic material disposed on the opposite side to the sliding surface. It is configured to be formed of a material.

According to the present invention, there is provided a step of forming a groove having a width corresponding to the width of a recording track on a bonding substrate in which a nonmagnetic material and a magnetic material are bonded, and forming a metal magnetic film by filling the groove to form a magnetic core half. Forming a body block, forming a magnetic core block by abutting a pair of magnetic core half blocks on surfaces on which grooves are formed, and butting a magnetic core half block having a groove in the magnetic core block A method of manufacturing a magnetic head, comprising the steps of forming a sliding surface with a magnetic recording medium by processing a surface of a nonmagnetic material that intersects with a surface, and allowing the metal magnetic film in a groove to face the sliding surface.

Hereinafter, embodiments of a magnetic head and a method of manufacturing the same according to the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the magnetic head of the present invention. Magnetic head 20 of this example
Is formed by joining and integrating a pair of magnetic core halves 3m and 3n mainly made of a joining material in which non-magnetic materials 1m and 1n and magnetic materials (for example, magnetic ferrites) 2m and 2n are joined. Then, a closed magnetic path is formed by the joined magnetic core halves 3m and 3n, and a magnetic gap g1 having a predetermined azimuth angle is formed between the butted surfaces of the magnetic core halves 3m and 3n and operates as a recording / reproducing gap. Have been.

FIG. 2A is a cross-sectional view of the magnetic head 20 of FIG. 1 taken along the line AA ', and FIG. 2B is a plan view of the sliding surface. In order to regulate the track width Tw of g1, a groove corresponding to the track width Tw is formed in a portion corresponding to the track of the magnetic core halves 3m and 3n, that is, in a part of the sliding surface 11 made of the nonmagnetic material 1m and 1n. 4 (4m, 4n) are dug, and the metal magnetic films 5m, 5n to be joined to the magnetic materials 2m, 2n are filled in the grooves 4m, 4n.

The butting surfaces of the magnetic core halves 3m and 3n are provided with winding grooves 6 for winding coils.
(6m, 6n) are provided in positions facing each other of the magnetic core halves 3m, 3n in the core thickness direction.

The sliding surfaces of the winding grooves 6m, 6n are filled with a fusion glass 9 for fusing the magnetic core halves 3m, 3n, and the fusion glass 9 is opposite to the sliding surface 11. That is, the molten glass filling groove 7 formed on the back side is also filled.

The magnetic gap g1 is formed facing the sliding surface 11 with the magnetic recording medium, and the sliding surface 11 is formed with a contact width regulating groove 10 for regulating the contact width with the magnetic recording medium.

On the other hand, on the outer surfaces of the magnetic core halves 3m and 3n, for example, a winding guide having a substantially U-shaped cross section for ensuring the winding state of the coils wound in the winding grooves 6m and 6n. A groove 8 is provided.

In the magnetic head 20 according to the present embodiment, the track width Tw is controlled by the groove 4 formed by etching or the like.
Since the track width is regulated by the widths of m and 4n, it is possible to control the track width dimension with higher accuracy.
Since the track width can be easily controlled, work efficiency in manufacturing can be improved.

Since the grooves 4m and 4n make the edges of the tracks extremely sharp, it is possible to avoid the bleeding phenomenon at the end of the recording pattern on the magnetic recording medium. The influence on the adjacent track signal caused by the side portion of the track width regulating groove 57 can also be suppressed.

Further, in the magnetic head 20 of the present embodiment, the magnetic core halves 3m, 3m other than the metal magnetic films 5m, 5n.
n is composed of a composite material formed of the non-magnetic materials 1m and 1n on the sliding surface 11 side and the magnetic materials 2m and 2n on the opposite side of the sliding surface 11, The magnetic material does not exist in portions other than the track portion by the metal magnetic films 5m and 5n. Therefore, the area other than the track portion on the sliding surface 11 is a non-magnetic material and has no magnetic material, so that a crosstalk phenomenon with an adjacent recording track can be avoided.

The magnetic head 20 is manufactured, for example, as follows. First, as shown in FIG. 3A, a flat non-magnetic material substrate 21 and a flat magnetic material substrate 22 made of, for example, magnetic ferrite are bonded to form a flat bonded substrate 23.

Next, as shown in FIG. 3B, a groove 4 for filling the metal magnetic film later and regulating the track width Tw is formed.
Are formed. Regarding the method of forming the grooves 4, various etching methods and laser processing techniques can be used in addition to machining with a grindstone.

In the thus formed groove 4,
Although not shown, the metal magnetic film 5 is formed by a method such as sputtering.
Fill. Thereafter, the bonding surface 23 in which the metal magnetic film 5 is filled only in the groove 4 is obtained as shown in FIG.

Next, as shown in FIG.
The magnetic core half block 25 is obtained by forming the winding groove 6 and the fused glass filling groove 7 in FIG. In this case, the winding groove 6 is formed such that the joint between the metal magnetic film 5 and the magnetic material substrate 22 remains.

Next, a gap film (not shown) made of a non-magnetic material such as SiO ₂ is formed on the gap surfaces of the pair of magnetic core half blocks 25. The gap film serves as a magnetic gap g1, and the thickness of the gap film formed on each magnetic core half block 25 is set to be half the gap length of the magnetic head 20 to be manufactured.

The pair of magnetic core half blocks 25 manufactured as described above are abutted so that their respective gap surfaces are opposed to each other, and are inserted into the facing winding groove 6 and the fused glass filling groove 7. A glass rod is inserted and the glass rod is melted. As a result, as shown in FIG. 5E, the glass rod is melted, and the magnetic core half block 25 is melted by the fusion glass 9.
Are joined and integrated to form a magnetic core block 26.

Next, as shown in FIG. 5F, the nonmagnetic material side of the magnetic core block 26 is subjected to cylindrical polishing to form the sliding surface 11 with the magnetic recording medium. Thus, the metal magnetic film 5 formed in the groove 4 having a width corresponding to the width of the recording track faces the sliding surface 11, and the recording track width can be defined by the metal magnetic film 5.

Further, the lower half and subsequent portions of the fusing glass filling groove 7 are removed, and a substantially U-shaped winding guide groove 8 is formed on the outer surface of the magnetic core block 26. Further, although not shown, in order to regulate the contact width of the magnetic head with respect to the magnetic recording medium, the width regulating grooves 1 are located at positions at both ends of the medium sliding surface.
0 is formed so as to have a predetermined azimuth angle.

Finally, the magnetic core block 26 is cut into a magnetic core, and the cut magnetic core is adjusted to a predetermined shape to obtain the magnetic head 20 as shown in FIGS. .

By manufacturing the magnetic head 20 in this manner, the recording track is formed by the metal magnetic film 5 formed in the groove 4 having the track width Tw by etching or the like.
Therefore, the edge of the recording track is formed very sharply and with high precision. Further, since the track width Tw can be defined by the groove 4 formed in the bonding substrate 23, the track width Tw can be easily formed.
Therefore, it is possible to avoid the side fringing phenomenon, crosstalk, and the like, which are problems in the conventional magnetic head.

In this embodiment, a groove 4 for regulating the track width Tw and filling the metal magnetic film 5 is formed first, and after filling the metal magnetic film 5 in this groove 4, the winding groove is formed. 6 and the fusing glass filling groove 7 are formed. However, for example, before filling the metal magnetic film 5, the winding groove 6 and the fusing glass filling groove 7 are formed, and the metal magnetic film 5 is It may be a structure formed inside.

The magnetic head and the method of manufacturing the same according to the present invention
The present invention is not limited to the above-described example, and may take various other configurations without departing from the spirit of the present invention.

[0049]

According to the magnetic head of the present invention, the width of a recording track can be controlled by a groove formed by etching or the like and filled with a metal magnetic film, and the track width is regulated by the width of the groove. Therefore, the control of the track width becomes easier as compared with the related art, and the working efficiency in manufacturing is improved. In particular, when etching is used to form the track width regulating groove, the groove can be formed with high precision.
It is possible to control the track width with high accuracy.

By forming the groove filled with the metal magnetic film, the edge of the recording track can be formed very sharply. Therefore, it is possible to avoid the side fringing phenomenon which is a problem in the conventional magnetic head.

Further, when the magnetic core half other than the metal magnetic film is formed of a composite material formed of a non-magnetic material on the sliding surface side and a magnetic material on the opposite side to the sliding surface, the magnetic core half is formed on the sliding surface. Since the magnetic material does not exist in a portion other than the track portion due to the metal magnetic film, a crosstalk phenomenon with an adjacent recording track can be avoided.

According to the method of manufacturing a magnetic head of the present invention,
It is possible to easily and accurately form the track width, and it is possible to easily manufacture an excellent magnetic head that can solve various problems caused by the conventional track width regulation method.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram (perspective view) of an embodiment of a magnetic head according to the present invention.

FIG. 2A is a cross-sectional view of the magnetic head of FIG. 1 taken along a plane including AA '; B is a plan view of a sliding surface of the magnetic head of FIG. 1.

3A and 3B are manufacturing process diagrams of the magnetic head of FIG. 1;

4C and 4D are manufacturing process diagrams of the magnetic head of FIG. 1;

5E and 5F are manufacturing process diagrams of the magnetic head of FIG. 1;

FIG. 6 is a schematic configuration diagram (perspective view) of an example of a metal-in-gap type magnetic head.

7A and 7B are manufacturing process diagrams of the magnetic head of FIG. 6;

8C and 8D are manufacturing process diagrams of the magnetic head of FIG. 6;

FIG. 9A is a plan view of a sliding surface of the magnetic head of FIG. 6; B is an enlarged view of a part of FIG. 9A.

[Explanation of symbols]

1m, 1n non-magnetic material, 2m, 2n magnetic material, 3
m, 3n magnetic core half, 4,4m, 4n groove, 5,5
m, 5n metal magnetic film, 6, 6m, 6n winding groove, 7
Fusing glass filling groove, 8 winding guide groove, 9 fusing glass, 10 width limiting groove, 11 sliding surface, 20 magnetic head, 21 non-magnetic material substrate, 22 magnetic material substrate,
23 bonding substrate, 25 magnetic core half block, 26
Magnetic core block, 51 magnetic head, 52, 53 magnetic core half, 54 metal magnetic film, 55 width limiting groove,
56 sliding surface, 57 track width regulating groove, 58 winding groove, 59 fusion glass, 60 winding guide groove, 61 fusion glass filling groove, 71 substrate, 72 projection, 73 magnetic core half block, 74 magnetism Core block, g, g1
Magnetic gap, Tw track width

Claims (3)

[Claims] 1. A pair of magnetic core halves are joined and integrated,
In a magnetic head in which a magnetic gap is formed between abutting surfaces of the magnetic core halves, a groove having a width corresponding to the width of the recording track is formed at a recording track forming position on the abutting surface. A magnetic head comprising a metal magnetic film embedded therein. 2. A portion of the magnetic core half except for the metal magnetic film is formed of a non-magnetic material disposed on a sliding surface side with a recording medium and a magnetic material disposed on a side opposite to the sliding surface. 2. The magnetic head according to claim 1, wherein the magnetic head is formed of a bonding material composed of a material. 3. A step of forming a groove having a width corresponding to the width of a recording track on a bonding substrate in which a nonmagnetic material and a magnetic material are bonded, and forming a metal magnetic film by filling the groove to form a magnetic core half. A step of forming a block; a step of abutting a pair of the magnetic core half blocks on surfaces on which the grooves are formed to form a magnetic core block; and a step of forming the magnetic core half in the magnetic core block having the grooves formed therein. Forming a sliding surface with the magnetic recording medium by processing a surface of the non-magnetic material that intersects with the abutting surface of the body block, and causing the metal magnetic film in the groove to face the sliding surface. A method for manufacturing a magnetic head, comprising: