JPH0668817B2 - Magnetic head manufacturing method - Google Patents

Description

The present invention relates to a magnetic head structure for recording / reproducing signals on / from a high coercive force medium such as a metal tape.

[Conventional technology]

In the magnetic recording technology, a high coercive force medium has been used in recent years due to the demand for high density recording. In order to record a signal on a high coercive force medium, the conventional ferrite head is insufficient because it is magnetically saturated in the vicinity of the gear. Therefore, a composite type magnetic head has been developed which has a high saturation magnetic flux density at least in the vicinity of the gear and uses an alloy magnetic material such as Sendust or Co-based amorphous magnetic alloy, and the other is composed of ferrite.

FIG. 9 shows a perspective view of a conventional magnetic head, for example, Japanese Unexamined Patent Publication No. 61-11909, and FIG. 10 shows a sliding surface in contact with a storage medium. FIGS. 9 (1a) and (1b) show the first core, the second core, (12a), (12b), which are formed of the high permeability magnetic block.
(12c), (12d) are the first core, the second core (1a), (1b)
The welded glass portion formed in (1), (13) is a track width regulating groove that is grooved to the track width with the width of the foil, and (8) is an alloy magnetic film formed by a method such as sputtering.
(4) is a working gear made of high hardness, high melting point non-magnetic gear material such as SiO ₂ , Al ₂ O ₃ , Si ₃ N ₄ , and (5) is a winding window for winding the coil. is there.

[Problems to be solved by the invention]

In the conventional magnetic head manufacturing method configured as described above, the track width Tw is determined by the width of the wheel (rotary grindstone) for groove processing, so it is very difficult to regulate the tolerance to plus or minus a few microns. There was a problem that it was difficult.

The present invention has been made to solve the above problems, the track width Tw can be determined independently of the width of the wheel for groove processing, and the track width can be accurately regulated. It is an object of the present invention to obtain a magnetic head manufacturing method which is excellent in productivity and has high mass productivity.

[Means for solving problems]

According to the method of manufacturing a magnetic head of the present invention, a first groove having a size equal to or larger than a track width for recording / reproducing is provided on a surface facing a magnetic recording medium, and the alloy magnetic material is filled in the first groove to face the recording medium. A step of forming a first core in which a surface perpendicular to the surface serves as a gear forming surface, and a second step in which the gear forming surface is notched at a position displaced from the side end of the first groove of the first core by a track width
The first groove processing step of processing the groove to regulate the track width, the third groove having a size larger than the track width for recording / reproducing is provided on the surface facing the magnetic recording medium, and the alloy magnetic material is filled in the third groove. The step of forming the second core in which the surface perpendicular to the surface facing the recording medium serves as the gear-forming surface, the gear-forming surface is cut away from the side edge of the third groove of the second core by a distance corresponding to the track width. Second groove processing step of processing the fourth groove to regulate the track width, the non-magnetic material for forming the gear group is interposed on the gear forming surface, and the second groove and the fourth groove are arranged at different ends in the track width direction. Then, the two tracks are put together, and a joining step of joining the first and second cores with the non-magnetic material filled in the second groove and the fourth groove is performed.

[Action]

In the method of manufacturing a magnetic head of the present invention, a groove having a track width dimension or more is provided in the core block, the alloy magnetic film is arranged in the groove, and the track width is shifted from the side end of the alloy magnetic film by a position corresponding to the track width. Since a track width regulation groove is provided and the groove width is regulated by the accuracy of the pitch feed, a magnetic head having a simple regulation of the track width, mass productivity and less variation in quality can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a perspective view of a magnetic head obtained by a method of manufacturing a magnetic head according to an embodiment of the present invention, and FIG. 2 is a plan view of a sliding surface of the magnetic head that contacts a recording medium. Figure 1,
In FIG. 2, (1a) and (1b) are the first core,
2nd core, (2a), (2b) is the 2nd for track width regulation
Glass is molded in the groove and the fourth groove. (3a),
(3b) is the first groove, the third groove, (4) is the operating gear,
(5) is a winding window, (8) is an alloy magnetic film, (9a), (9b)
Are filled with a non-magnetic material such as glass in the fifth and sixth grooves for joining, respectively.

Next, a method of manufacturing the magnetic head shown in FIGS. 1 and 2 will be described. First, on the surface of the core block (1) shown in FIG. 3 facing the magnetic recording medium, as shown in FIG. 4, the first grooves (3a), (3c), (3e) having a dimension larger than the track width and Three grooves (3b), (3d), (3f) are provided, and the alloy magnetic material is used for the first groove and the third grooves (3a), (3b), (3c), (3d), (3e),
It is filled in (3f) to form alloy magnetic films (8a), (8b), (8c). Here, as the alloy magnetic material, for example, sendust, Co-based amorphous or the like was used, and it was deposited and filled by a physical vapor deposition method such as a sputtering method or a chemical vapor deposition method. After that, the first core and the second core are formed by cutting along the line AA 'in FIG. The cut surface serves as a gear forming surface, which is a surface perpendicular to the surface facing the recording medium. Then, as shown in FIG. 5, the first core and the first groove are displaced from the side edges by the track width and the third core of the second core is displaced from the side edge by the track width.
First and second groove processing steps are performed for processing the second groove (2a) and the fourth groove (2b) notched on the gear cup forming surface, respectively. Further, in this embodiment, in the first groove processing step, the fifth groove (9a) is formed in the first core (1a) portion facing the fourth groove (2b) at the same end in the track width direction, and the second groove is formed. In the groove processing step, the sixth groove (9b) is formed in the portion of the second core (1b) facing the second groove (2a) at the same end in the track width direction. Second
Groove (2a), 4th groove (2b), 5th groove (9a), 6th groove (9b)
A non-magnetic material (10a), (1) is formed by filling a non-magnetic material by a method such as glass molding to form a winding window (5) and polishing the gear butt surface, that is, the gear-forming surface.
0b) is vapor deposited. Further, the first core (1a) and the second core (1
The second groove (2a) and the fourth groove (2b) of b) are arranged at different ends in the track width direction, and both tracks are aligned.
The first core (1a) and the second core (1b) are fixed by a method such as welding with a non-magnetic material filled in the second groove (2a) and the fourth groove (2b) (see FIG. 6). , Joining process, B-
B ', C-C' are cut, the sliding surface is ground to a predetermined gear depth, and a predetermined coil is wound around the winding window (5). In this embodiment, the non-magnetic material filled in the fifth groove (9a) and the sixth groove (9b) in the joining process is also the first.
Used for fixing and joining the core (1a) and the second core (1b),
Both core joints are strengthened. Thereby, sufficient mechanical strength can be obtained.

With this arrangement, the width of the conventional foil, that is, the track width, which was determined by the width of the groove, is determined by the accuracy of the pitch feed, and the accuracy of the pitch feed can easily be 1 μm or less. The track width can be regulated.

As shown in FIG. 1, it is desirable that the groove depth dimension Wd of the first groove and the third groove (3) is larger than the gear head depth Gd of the magnetic head in terms of recording efficiency and reproducing efficiency.

The core material must be a magnetic material for forming a magnetic path, but an oxide ferromagnetic material having a high resistivity and good high frequency characteristics, such as Mn-Zn ferrite, is preferable.

Although the fifth groove (9a) and the sixth groove (9b) for welding for joining the first core and the second core are provided in the above embodiment,
It is not always necessary, and only one of them may be used. However, from the viewpoint of strength, it is more desirable to provide the fifth groove (9a) and the sixth groove (9b).

Further, in the above embodiment, the case where the working gear (4) does not have azimuth has been described, but the present invention is not limited to this, and it can be applied to the case where the working gear (4) has azimuth like a video head.

Also, as shown in FIG. 7 for reference, only one core has the second and fourth grooves (2a) and (2b) for restricting the track width.
The same effect can be obtained with a structure having. In this case, the track width is restricted by the distance between the second groove (2a) and the fourth groove (2b).

Further, as shown in FIG. 8, the structure in which the sliding surface other than the alloy magnetic film (8) is covered with the non-magnetic blocks (11a) and (11b) has the same effect as in the above embodiment. It is effective as a measure against crosstalk, wear, and sliding noise. Further, it goes without saying that this embodiment can be applied to the structure shown in FIG.

〔The invention's effect〕

As described above, according to the present invention, the first groove having a size larger than the track width for recording / reproducing is provided on the surface facing the magnetic recording medium, and the alloy magnetic material is filled in the first groove to face the recording medium. The step of forming the first core in which the surface perpendicular to the surface is the gear forming surface, and the second groove is formed by notching the gear forming surface at a position displaced by the track width from the side end of the first groove of the first core. In the first groove processing step for controlling the track width, a third groove having a size larger than the track width for recording / reproducing is provided on the surface facing the magnetic recording medium, and the alloy magnetic material is filled in the third groove to form a recording medium. Forming a second core in which a surface perpendicular to the facing surface of the second core serves as a gear forming surface, a fourth groove in which the gear forming surface is cut out at a position displaced from the side end of the third groove of the second core by the track width. Second groove processing step to control the track width by processing A non-magnetic material filled in the second groove and the fourth groove by interposing a non-magnetic material for forming a gear and arranging the second groove and the fourth groove at different ends in the width direction of the track and aligning both tracks. Since the joining step of joining the first and second cores is performed, there is an effect that a processing method of the track width Tw is good and a magnetic head manufacturing method excellent in mass productivity can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head obtained by a method of manufacturing a magnetic head according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. 3 to 6 are perspective views showing a method of manufacturing a magnetic head according to one embodiment of the present invention in the order of steps, FIG. 7 is a plan view fried as a reference example, and FIG. 8 is another embodiment of the present invention. FIG. 9 is a perspective view of the magnetic head according to FIG. 9, and FIGS. 9 and 10 are a perspective view and a plan view, respectively, showing the magnetic head obtained by the conventional manufacturing method. (1a) …… First core, (1b) …… Second core, (2a) ……
Second groove, (2b) ... fourth groove, (3a) ... first groove, (3b)
...... Third groove, (4) ...... Operating gear, (5) ...... Winding window, (8) ...... Metallic magnetic film, (9a) ...... Fifth groove, (9b)
…… Sixth groove, (10a), (10b) …… Non-magnetic material for forming gears The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A first groove having a size equal to or larger than a track width for recording / reproducing is provided on a surface facing a magnetic recording medium, and an alloy magnetic material is filled in the first groove to form a surface perpendicular to a surface facing the recording medium. The step of forming the first core to be the gear forming surface, the second groove having a notch in the gear forming surface is formed at a position displaced from the side end of the first groove of the first core by the track width, and the track width is regulated. In the first groove processing step, a third groove having a size equal to or larger than the track width for recording / reproducing is provided on the surface facing the magnetic recording medium, and the alloy magnetic material is filled in the third groove to form a surface perpendicular to the surface facing the recording medium. The step of forming the second core whose surface serves as the gear forming surface, and processing the fourth groove in which the gear forming surface is cut out at a position displaced from the side end of the third groove of the second core by the amount corresponding to the track width. Second groove processing step to regulate the By interposing a timber, a second groove and a fourth groove combined arrangement to both track the different One end of the track width direction, the nonmagnetic material is filled into the second groove and the fourth groove 1
A method of manufacturing a magnetic head, which comprises a joining step of joining a core and a second core. 2. A fifth groove is formed in the first core portion facing the fourth groove at the same end in the track width direction in the first groove processing step, and the fourth groove and the fifth groove are formed in the bonding step. The method of manufacturing a magnetic head according to claim 1, wherein the first core and the second core are joined with a filled non-magnetic material. 3. A sixth groove is formed in a second core portion facing the second groove at the same end in the track width direction in the second groove processing step, and the second groove and the sixth groove are formed in the joining step. The method for producing a magnetic head according to claim 1 or 2, wherein the first core and the second core are joined with a filled non-magnetic material.