JPS6226608A - Single magnetic pole type magnetic head - Google Patents

Abstract

PURPOSE:To decrease the influence of the external magnetic noise and to improve the recording reproducing sensitivity by surrounding almost the main magnetic pole and the winding by the magnetic material. CONSTITUTION:Magnetic core parts 7a and 7b for the guard and a main magnetic pole 3, which form a magnetic recording media facing surface S and come to be the return path part of the magnetic flux of the main magnetic pole 3, are composed of a forward core part 9 integrated so that the magnetic core parts 7a and 7b for the guard can surround the main magnetic pole 3 through nonmagnetic materials 8a and 8b and a backward core part 4 to have a winding storing groove part 10 and to have a magnetic core part 4a for the excitation at the inside of a winding 6, and one edge of the main magnetic pole 3 faces on the magnetic recording media facing surface S and other edge is magnetically linked to the magnetic core part 4a for the excitation. Thus, the main magnetic pole and the winding are almost surrounded by the magnetic material, shielded from the external floating magnetic field, and therefore, the influence of the external magnetic noise can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a single-pole magnetic head that can magnetize and record in the thickness direction of a magnetic recording medium, that is, in the perpendicular direction, and can perform high-density recording.

[Summary of the invention]

The present invention provides a single-pole magnetic head that magnetizes and records in the thickness direction of a magnetic recording medium, that is, in the perpendicular direction, and is capable of achieving density recording of 71 degrees. and a front core part in which a guard magnetic core part, which becomes a return path part for the S flux of the main magnetic pole, and the main magnetic pole are integrated so that the guard magnetic core part surrounds the main pole through a non-metallic material; It is different from the rear core part which has a winding storage groove part and has a magnetic core part for excitation inside the winding, one end of the main pole faces the surface facing the magnetic recording medium and the other end faces the magnetic core part for excitation. By making it magnetically coupled to the main pole, the shadow of external stray magnetic fields is reduced, and the magnetic core for the main pole is used as a return path for the magnetic flux of the main pole, which improves the recording and reproducing sensitivity. In order to improve the quality of recording and playback,
In addition, it is possible to reduce processing steps and improve productivity.

[Conventional technology]

Conventionally, a single-pole magnetic head as shown in FIG. 13 has been proposed as a single-pole magnetic head capable of magnetizing and recording in the thickness direction, that is, perpendicularly, of a magnetic recording medium to achieve high-density recording.

In this Fig. 13, (1) and (2) respectively indicate non-magnetic guard materials, and the main magnetic pole (3) is sandwiched and joined with the second non-magnetic guard materials (1 and (2)). A rear core portion (4) formed of a magnetic material is joined to the rear.

This rear core part (4) includes an excitation magnetic core part (4a) and a return path part (4a) that serves as a return path for the magnetic flux of the main magnetic pole.
b) Grooves (5a) and (5b) separating
) is provided, and a recording/reproducing winding (6) is provided on the magnetic core (4a) through the grooves (5a) and (5b). Moreover, the grooves (5a) and (5b) become more distant from the main magnetic pole (3), the more the excitation magnetic core part (4a)
The excitation magnetic core part (4a) is formed to have a larger cross-sectional area, and the farther it is from the main magnetic pole (3), the smaller the magnetic resistance is, making it easier for perpendicular magnetic flux to pass through.
3), the vertical magnetic flux is concentrated and the magnetic flux is supplied to the main pole (3) with high density.

According to such a conventional single-pole magnetic head, it is possible to magnetize and record in the thickness direction of the magnetic recording medium, that is, in the perpendicular direction, so it is possible to perform extremely high-density magnetic recording compared to a ring-type magnetic head. .

[Problem that the invention seeks to solve]

However, such conventional single-pole magnetic heads have a configuration close to a closed magnetic path, and therefore have the disadvantage that they are more easily affected by external calm noise than ring-type magnetic heads with a closed magnetic path configuration. - In view of the above, an object of the present invention is to provide an inexpensive single-pole magnetic head that can reduce the influence of external magnetic noise and improve recording and reproducing sensitivity.

[Means for solving problems]

As shown in FIGS. 1 to 3, the single-pole magnetic head according to the present invention has a guard magnetic field that forms the arsenic recording medium facing surface s'6 and serves as a return path for the magnetic flux of the main pole (3). The core parts (7a) and (7b) and the main magnetic pole (3) are made of non-magnetic material (
8a) and (8b)? Through the guard magnetic core part (7
a) and (7b) have a front core part (9) integrated so as to surround the main magnetic pole (3) and a winding storage groove part α0, and a supporting magnetic core part inside the winding (5). (4a) The main magnetic pole (3) has one end facing the magnetic recording medium facing surface S and the other end facing the excitation magnetic core part (4a).
) is magnetically coupled to the

[Effect]

According to the present invention, the main pole (3) and the winding (6) are
Generally surrounded by magnetic material and shielded from external stray magnetic fields. Therefore, the influence of external magnetic noise can be completely reduced.

Further, the guard magnetic core parts (7a) and (7b) serve as return path parts for the magnetic flux of the main magnetic pole (3).Therefore, the return path parts are close to each other, and the recording and reproducing sensitivity can be completely improved.

Furthermore, according to the present invention, the number of processing steps is reduced.

Therefore, productivity is improved and the single pole type magnetic head can be made inexpensive.

〔Example〕

Hereinafter, one embodiment of the single-pole type magnetic head of the present invention will be explained with reference to FIGS. 1 to 3.1 In FIGS. The same reference numerals are given, and detailed explanation thereof will be omitted.

In FIGS. 1 and 2, (9) indicates the front core part, and this front core part (9)'e li-resistant guard material (7
Non-magnetic materials (8a) and (8b) with a) and (7b)
'ii- The main magnetic pole (3) is sandwiched and joined to form the main magnetic pole (3). Further, (4) indicates a rear core portion made of magnetic material, and the main magnetic pole (3) is located on the side of this rear core portion (4) that is in contact with the front core portion (9) as shown in FIGS. 2 and 3. A return path portion (4b) (4) serves as a return path for the magnetic flux of the magnetically coupled excitation magnetic core portion (4a) and the main magnetic pole (3).
a) is provided with a cylindrical annular winding groove portion α0 that separates the winding wire from
a) and (12b) are provided, a predetermined winding (6) is applied to this winding groove α0, and one end (6a) and the other end (6b) of this winding (6) are connected to narrow grooves (12B) and ( 12b).The rear core part (4) constructed in this way is combined with the above-mentioned front core part (9) to form a single-pole type sharpening head as shown in FIG.

Here, the production of the single magnetic pole type insulating head P according to this example will be explained with reference to FIG. 4 and subsequent figures.

First, as shown in FIG. 4, a magnetic material block, for example, Mn −
Magnetic material block αG' made of Zn-based, Ni-Zn-based ferrite, etc. A semi-cylindrical groove a'f)' is formed on one side of this s-material block αQ. Next, this groove αη
Filled with glass, or filled with a dense non-magnetic material that has a coefficient of thermal expansion similar to that of ferrite (e.g. non-magnetic ferrite, 7-orsterite, photoceram, crystallized glass, barium titanate, calcium titanate, At20 ．．
- A TiC-based ceramic (ZrO2, etc.) is processed into a semi-cylindrical shape, glass is fused into the groove αη, and the surface filled with this non-magnetic material (8) is mirror-polished (FIG. 5). Next, the main magnetic pole (3
) magnetic thin film (・9-Malloy, Sendust, Co-
A high permeability magnetic film such as an amorphous or magnetic film such as Zr, Co-Zr-Nb, etc.) is coated with a predetermined thickness, e.g. 0.1 μm.
This magnetic film is photoetched to form stripes with a predetermined track width and spacing (FIG. 6). Next, the magnetic film that will become the auxiliary magnetic pole α frame (main magnetic pole (3)
(may be made of the same material as the above) is applied to a predetermined mold with a thickness of about 1 μm to 5 pm using the lift-off method, for example, and a 5 inch 2.31. N4. At20. hard films such as
．． A thickness of about 1 μm to 3 μm is deposited, and a flattening process is performed to attach the eW to the opposite substrate (FIG. 7). Next, bond the same board as shown in Figure 5, cut it into the specified shape, and connect the connecting surface. : Mirror polish (
Figure 8).

Next, in order to manufacture the rear core part (4), as shown in FIG.
Prepare a block of boron material such as n-type ferrite,
After polishing this upper surface k fi 1, in order to provide the winding groove α0 and the lead wire narrow groove (6), a sandblasting photoresist is used to form a resist pattern in a predetermined shape, and the winding wire is polished using sandblasting. A groove portion α0 for the lead wire and a narrow groove (6) for the lead wire are formed (FIG. 9). Next, this block for the rear core part (to) is indicated by the chain line ml, rfJ,
After cutting along the planes shown in m3, . r
According to this embodiment, the main magnetic pole (3) and the winding are cut at n2 + n3, . (6) is almost surrounded by magnetic material and shielded from external stray magnetic fields, which has the advantage of reducing the influence of external magnetic noise.Furthermore, the guard magnetic core parts (7a) and (7b) have the main magnetic pole ( 3)
Since the return path portion becomes a return path portion for the magnetic flux, there is an advantage that the return path portion becomes closer and the recording/reproducing sensitivity can be improved. Therefore, there is an advantage that good recording and reproduction can be performed.

Also, according to this embodiment, the winding is pre-wound using a winding machine! Simply insert ff (6)' into the winding groove α0,
The winding (6) can be attached, and since the groove α0 is completely processed by sandblasting, processing can be carried out in a short time, and since a photoresist mask is used, high precision processing is possible. All you need to do is attach a resist mask pre-formed in the shape of , to the magnetic material plate. Therefore, there are advantages in that the number of processing steps is reduced, productivity is improved, and the single-pole magnetic head can be manufactured at a lower cost.

In addition, as shown in FIG. 11, the joint surface of the rear core part (4) and the front core part (9) is formed into a chevron shape so that the winding (6 n is the main magnetic pole (3)
The present invention can also be applied to a device that is placed close to the tip, and similar effects can be obtained.In addition, if slight waveform distortion is a problem, as shown in Figure 12, the main magnetic pole Distorted noise can be reduced by slanting the end face of the return path section.

Furthermore, the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, the main pole and the winding are substantially surrounded by magnetic particles and are shielded from external stray magnetic fields, so there is the advantage that the effects of external magnetic noise can be reduced.

In addition, since the guard breakable core portion serves as a return path portion for the foundation bundle of the main magnetic pole, the return and gas portions are closer together, which has the advantage of improving recording and reproducing sensitivity.

Therefore, there is an advantage that good distribution and reproduction can be performed.

Further, according to the present invention, since the number of processing steps is reduced, productivity is improved, and there is an advantage that the total cost of the single magnetic pole type core head can be made cheaper.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a single magnetic pole type mountain head of the present invention, FIG. 2 is an exploded perspective view showing an embodiment of the present invention,
FIG. 3 is a sectional view showing one embodiment of the present invention, and FIGS.
0 is a diagram for explaining a manufacturing example of one embodiment of the present invention, FIG. 11 is a sectional view showing another embodiment of the present invention, and FIG.
FIG. 2 is a plan view showing another embodiment of the present invention, and FIG. 13 is a perspective view showing a conventional example. (3) is the main magnetic pole, (4) ? ″i Rear core part, (4a)
is the excitation core part, (6) is the winding wire, (7a) and (7b)
(8a) and (8b) are non-magnetic materials, (9) is a front core portion, and α0 is a winding storage groove portion.

Claims (1)

[Claims] A guard magnetic core portion that forms a surface facing the magnetic recording medium and serves as a return path for the magnetic flux of the main magnetic pole and the main magnetic pole are integrated with each other through a non-magnetic material such that the guard magnetic core portion surrounds the main magnetic pole. The main magnetic pole has one end facing a surface facing the magnetic recording medium, and a rear core part having a winding storage groove and an excitation magnetic core part inside the winding. A single pole type magnetic head, characterized in that an end thereof is magnetically coupled to the excitation magnetic core section.