JP2546826B2 - Manufacturing method of composite type magnetic head - Google Patents

Description

The present invention relates to a method of manufacturing a composite type magnetic head used for a hard disk for a computer or an RDD (ridged disk drive) having a narrow track width.

[Conventional technology]

As a magnetic head that floats generally parallel to a rotating magnetic recording medium, recently, in a groove 3 provided on the magnetic recording medium outflow end side of a slide rail 1a of a slider 1 made of a non-magnetic material as shown in FIG. 3 (a). In Fig. 3 (b), a magnetic head chip 2 shown in Fig. 3 (b) was incorporated and adhered with an adhesive glass 5, and a composite type magnetic head assembled as shown in Fig. 3 (c) was developed. It is disclosed in Japanese Patent No. 189173.

The magnetic head chip 2 is made of a magnetic material. For example, as shown in FIG. 3 (b), the core 2a having no winding groove and the core 2b having the winding groove 2c are butted against each other. The pair of cores 2a and 2b are bonded by filling the bonding glass 4 in the gap portion G side in the winding groove 2c formed between both and at least one of the cores 2b.

The edge 2d on the side of the gap G has a track width Tw.
The meat removal process is performed to regulate (20-40 μm),
The shape is thinner than other parts.

[Problems to be solved by the invention]

For high-density magnetic recording, it is necessary to increase either linear recording density or track recording density, or both at the same time. On the magnetic head side, the track width and the magnetic gap length are reduced, and the magnetic recording medium is made thinner to increase the coercive force. This means that the magnetic flux amount per bit and the magnetomotive force are remarkably reduced as compared with the conventional one, so that the defect in the magnetic characteristics of the portion which can be ignored until now is highlighted. For example, when recording / reproducing efficiently on a magnetic recording medium with a narrow track width and a coercive force of 1500 Oersted or more, the loss of magnetomotive force due to the magnetic saturation of the thinned portion and the problem of "writing blur" due to an increase in fringing flux. Becomes larger, and the performance of the conventional composite type magnetic head has reached its limit.

If the thickness is reduced by performing a thickness reduction process for controlling the track width Tw, the magnetic flux leaks from the narrowed portion, and the magnetic flux is not sufficiently supplied to the gap portion at the tip of the magnetic head chip.

Therefore, the conventional magnetic head chip has a problem that reproduction output is not sufficiently produced.

The present invention has been derived from a detailed consideration and examination result from a comprehensive aspect such as a dimensional structure and a reproducing output characteristic of a magnetic head for a thinned portion which is a very delicate portion in terms of a magnetic circuit. It is an object of the present invention to solve the conventional problems and provide a method of manufacturing a composite type magnetic head having a high reproduction output performance suitable for high density magnetic recording.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention has a set of cores made of a magnetic material having a winding groove formed in at least one of them, but abutting surfaces thereof are provided with a gap portion for magnetic recording and reproduction having a predetermined track width. A magnetic head chip formed by filling the gap between the abutting surfaces and the gap side in the winding groove with glass and joining the set of cores to the magnetic recording medium outflow end of the slider made of a non-magnetic material. In a composite type magnetic head which is inserted into a groove provided on the side and adhered by glass, mechanical processing of meat removal that regulates the track width to the entire length on either side of the gap side edge of the magnetic head chip To at least the position of the apex to form a cut surface in a direction perpendicular to the magnetic recording medium facing surface, and the apex has a thickness of 50 μm.
A method of manufacturing a composite type magnetic head is characterized in that a sloped surface that is continuous with the cut surface is formed with a point that is close to or less than m as a starting point.

[Work]

The entire length of one side of the gap side edge of the magnetic head chip is machined to reduce the track width to at least the apex position to form a cut surface perpendicular to the magnetic recording medium facing surface. In addition, starting from a point 50 μm or less close to the apex,
A composite type magnetic head having a sloped surface following the cut surface is obtained. The composite type magnetic head having such a configuration can sufficiently supply and concentrate the magnetic flux to the gap portion as compared with the conventional magnetic head in which the edge on the side of the gap portion is sharply narrowed by the thinning process. .

Therefore, the reproduction output performance is improved as compared with the conventional one.

The reason why the starting point of the inclined surface is close to the apex by 50 μm or less is that the supply of the magnetic flux becomes insufficient when the size is larger than 50 μm, and the improvement of the reproduction output performance is not so remarkable.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to examples.

FIG. 1 is a perspective view of a magnetic head chip showing an embodiment manufactured according to the present invention, and FIG. 2 is a side view of the same main portion.

In FIG. 1, the magnetic head chip 2 has a core 2a made of a magnetic material such as ferrite and having no winding groove, and a core 2b made of the same magnetic material and having a winding groove 2c butted to each other. The bonding glass 4 is filled between the surfaces and between the butting surfaces on the opposite side (lower side in the figure), and the bonding glass 4 is also filled in the gap G side in the winding groove 2c to form the core 2a. It is manufactured by a manufacturing method in which the joint and the reinforcement are made between 2 and 2b.

The magnetic head chip 2 manufactured according to the present invention has a gap G formed by joining the cores 2a and 2b.
The edge of the side edge, that is, the entire length on the left side of the edge on the upper end side in FIGS. 1 and 2 is machined to remove the thickness to regulate the track width Tw, and the magnetic recording medium facing surface 2e is formed. A cut surface 6 is formed at a right angle, that is, in a direction perpendicular to the upper surface of FIGS. 1 and 2 up to at least the position of the apex Ap.

Further, following the cut surface 6, a sloped surface 7 with an angle θ is formed.
Are lined up. The starting point 7a of the sloped surface 7 is a point on the cut surface 6 whose distance t from the apex Ap is 50 μm or less.

1.5mm length, 1.2mm width, thickness 0.15, configured as above
mm, the track width of 20 μm, the magnetic head chip of the present invention,
Table 1 shows the results of measuring the reproduction output of a magnetic head using a conventional magnetic head chip of the same size.

As is clear from Table 1, all the magnetic heads manufactured according to the present invention (product according to the present invention) have higher reproduction output performance than the conventional ones.

〔The invention's effect〕

As described above, the composite-type magnetic head manufactured according to the present invention is for controlling the track width to the total length on either side of the gap side edge of the magnetic head chip adhered in the groove of the slider. Since the cut surface and the sloped surface following this surface are formed with a predetermined size, the magnetic flux can be concentrated and supplied to the gap portion by reducing the leakage of the magnetic flux, and the reproduction output performance can be improved. Is.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head chip showing an embodiment manufactured by the present invention, FIG.
FIG. 3A is a perspective view of a slider of a conventional composite type magnetic head, FIG. 3B is a perspective view of the same magnetic head chip, and FIG. 3C is a perspective view showing the same assembled state. 1: Slider, 2: Magnetic head chip, 2a, 2b: Core, 2c:
Winding groove, 2d: Gap portion side edge, 2e: Magnetic recording medium facing surface, 3: Slider groove, 4: Bonded glass, 5: Adhesive glass,
6: Cut surface, 7: Slope surface, 7a: Start of slope surface, Ap: Apex, G: Gap part, Tw: Track width, t: Distance between apex and start point, θ: Angle of slope surface

Claims (1)

(57) [Claims] 1. A pair of cores made of a magnetic material having a winding groove formed in at least one of the abutting surfaces, and a magnetic recording / reproducing gap portion having a predetermined track width is formed on one of the abutting surfaces. A groove in which a magnetic head chip formed by filling glass between the surfaces and in the gap portion in the winding groove and joining the set of cores is provided on the magnetic recording medium outflow end side of the slider made of a non-magnetic material. In the composite type magnetic head which is inserted into the inside and adhered by glass, the thickness of one side of the edge of the magnetic head chip on the side of the gap part is machined to reduce the track width by at least the apex position. To form a cut surface in a direction perpendicular to the magnetic recording medium facing surface, and to the cut surface starting from a point 50 μm or less close to the apex. A method for manufacturing a composite type magnetic head, characterized in that a continuous sloped surface is formed.