JP2645868B2 - Manufacturing method of floating magnetic head - Google Patents

Description

The present invention relates to a method of manufacturing a floating magnetic head.

(B) Conventional technology A composite magnetic head as shown in FIG. 6 has been proposed as a floating magnetic head used for recording and reproducing data on and from a hard disk as an external recording device such as an electronic computer. In the figure, (1) is a slider made of non-magnetic ceramics. (2) is a groove formed in the slider (1),
(3) is a head core chip made of ferrite, (4)
Is glass for joining the head core chip (3) and the slider (1). Here, after the head core chip (3) is inserted into the groove (2) of the slider (1), the glass (4)
Is melted into the groove (2) from the upper surface of the slider (1), whereby the glass (4) is joined to the slider (1). The melting of the glass is performed by placing a glass rod on the upper surface of the groove (2) and then heating and melting the glass rod.

The method of manufacturing the above magnetic head is disclosed in Japanese Patent Application Laid-Open No. 62-103808.
No. G11B5 / 133.

FIG. 1 is a perspective view of a head core block in which a head core chip is generated by cutting. In the figure,
(5) is a first wafer having a U-shaped cross section, (6) is a second wafer having a flat plate shape, and the first and second wafers (5) are used.
In (6), a gap spacer such as SiO ₂ is formed on the bonding surfaces (5a) and (6a) by a method such as vapor deposition, sputtering, or ion plating, and then the bonding surface (5a) is formed.
The glass (7) and (7) are welded together in a state where (6a) is butted. After the first and second wafers (5) and (6) are joined in this manner, grooves (8) are cut out on the upper surface thereof to thereby define a recording track width. Are formed. The head core chip (3) is produced by cutting the head core block (12) formed as described above in a plane indicated by a dotted line for each groove (8).

By the way, in this type of magnetic head, as shown in FIG. 6, a glass (4) for bonding is filled around the disk facing portion (9) on the upper surface of the slider (1). Since it faces the outside, those having as high a softening point as possible are preferable from the viewpoint of weather resistance (such as discoloration due to moisture). However, if the bonding glass has a high softening point, the head core chip (3)
Since the temperature at the time of heating to melt the glass when joining the head core chip to the slider (1) is high, the first and second wafers (5) and (6) of the head core chip (3) itself as described above.
The glass (7) joining the first and second wafers (5) and (6) is melted, causing a shift between the first and second wafers (5) and (6), which may change the magnetic gap. Conversely, if the heating temperature at the time of joining the head core chip (3) to the slider (1) is lowered so that such a problem does not occur, the joining glass does not soften sufficiently, and therefore, As shown in FIG. 7, the glass (4) does not flow between the head core chip (3) and the groove (2), so that the head core chip (3) and the slider (1) may not be firmly joined.

To solve these two problems at the same time,
There is a technique disclosed in JP-A-62-189617 (G11B5 / 60). In such a technique, a head core chip (3) and a slider (1) are joined by using two kinds of glasses having different softening points as shown in FIGS. 8 and 9, and as shown in FIG. After inserting the head core chip (3) into the groove (2) of (1), a glass rod (10) having a high softening point
(10) is inserted between the disk facing portion (9) and the inner surface of the groove (2), and a glass rod (11) having a low softening point is placed above the groove (2). Rod (10) (10), (1
1) is heated to melt only the glass rod (11) having a low softening point, and then the molten glass is cooled and solidified, and then the upper surface of the slider (1) is cut to the L = L 'plane and FIG. The disk facing surface shown in FIG.

If such a technique is used, glass having a high softening point can be arranged around the disk facing portion (9), so that the weather resistance of the glass surface can be improved and the glass having a low softening point can be provided. The head core chip (3) and the slider (1) can be firmly joined, but on the other hand, the glass rods (10), (10), and (11) must be inserted and placed in the groove (2) one by one. And the workability was poor. Also, when the glass rods (10) and (10) are inserted, the disk opposing part (9) may be damaged by collision of the glass rods (10) and (10).

(C) Problems to be Solved by the Invention The present invention can improve the weather resistance of the glass surface adjacent to the outside and can strengthen the bonding between the head core chip and the slider. An object of the present invention is to provide a method of manufacturing a floating magnetic head which is excellent in terms of surface.

(D) Means for Solving the Problems In view of the above problems, in the method of manufacturing a floating magnetic head according to the present invention, a plurality of types of glass are provided on the upper surface of a magnetic head core block in which a plurality of grooves are cut. The magnetic head core block is cut along the plurality of grooves to form a magnetic head core chip, and the magnetic head core chip is inserted into the groove of the slider. Then, the magnetic head core chip and the slider are joined by heating the magnetic head core chip to melt the glass.

(E) Function When the magnetic head core chip is inserted into the groove of the slider and heated, the lower glass is softened and flows between the magnetic head core chip and the inner surface of the groove. At this time, the upper glass is also softened and flows into the groove. Therefore, the magnetic head core chip is joined to the groove of the slider with each glass by cooling and solidifying the glass, and at this time,
Glass having a high softening point is positioned on the upper surface of the groove.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

As described above, the head core block (12) shown in FIG. 1 is generated, and thereafter, a first glass plate (13) having a softening point of 400 ° C. is placed on the upper surface thereof, and the upper surface thereof is further placed thereon. To
A second glass plate (14) having a softening point of 470 ° C. is stacked and mounted (see FIG. 2), and heated with 530 ° C. heat for 10 minutes. It is assumed that the first wafer (5) and the second wafer (6) forming the head core block (12) are joined by a glass (7 ') having a softening point of 600 ° C. However, when the head core block (12) on which the first and second glass plates (13) and (14) are placed is heated, the first glass plate (13) melts first and the head core block (1) is melted.
After flowing into the groove (8) of 2), the second glass plate (1)
4) softens and flows into the grooves (8). After the heat treatment is completed, the head core block (12) is cooled to obtain a head core block (12 ') as shown in FIG. Here, (15) and (16) are first and second glass layers formed by melting the first and second glass plates (13) and (14), respectively.

Next, the head core block (1
2 ') is cut along the broken line shown in FIG. 3 to form a head core chip (17).
Is inserted into the groove (2) of the slider (1) as shown in FIG. 4 and then heated at 530 ° C. for 10 minutes. By such heat treatment, the first glass layer (15) is sufficiently melted and flows between the head core chip (17) and the inner surface of the groove (2). At this time, the second glass layer (16) It softens and enters the groove (2) with the inflow of the first glass layer (16) (see FIG. 5). After the completion of the heat treatment, the slider (1) is cooled to solidify the molten glass, whereby the joining between the head core chip (17) and the slider (1) is completed. And such a head core chip (17)
After the joining of the magnetic head with the slider (1) is completed, the manufacturing of the magnetic head is completed by chamfering as shown in FIG.

As described above, according to the magnetic head manufacturing method of the present invention, the head core chip and the slider can be joined at a relatively low temperature by melting the first glass having a low softening point. The second glass having a high softening point can be exposed to the outside. Therefore, since the head core chip and the slider can be joined at a low temperature, there is no fear of softening the glass having a high softening point joining the first and second wafers forming the head core chip. There is no fear that the magnetic gap of the head core chip sometimes changes. Further, since the glass facing the outside in the upper part of the head core chip is the second glass having a high softening point, the glass surface facing the outside can be made a glass surface having high weather resistance.

Furthermore, the first glass layer and the second glass layer can be welded to the upper surface of the head core block only by placing the first and second glass plates on the upper surface of the head core block and performing heat treatment. A head core chip is cut out from the head core block and inserted into the groove of the slider, and then the head core chip and the slider can be joined only by performing a heat treatment. A gap between the facing portion and the groove of the slider,
In addition, it is not necessary to perform a cumbersome operation such as disposing the head core chip and the slider, so that the operation of joining the head core chip and the slider can be significantly simplified. Since the disk facing portion of the head core chip is protected by the first and second glass layers, there is no fear that the disk facing portion is damaged during this operation.

It is needless to say that the present invention is not limited to the above-described embodiment, and that various other modifications are possible.
For example, in the above embodiment, two glass layers are welded to the upper part of the core chip, but three or more glass layers may be formed.

(G) Effects of the Invention As described above, according to the method of manufacturing a floating magnetic head of the present invention,
The head core chip can be easily and reliably bonded to the slider, and the bonding is performed by relatively low-temperature glass welding, so that the head core chip can be bonded to the slider without softening the glass for bonding the head core chip itself. Can do. Further, when the joining is completed, the glass having a high softening point can be exposed to the outside, so that the glass surface adjacent to the outside can have strong weather resistance.

[Brief description of the drawings]

FIG. 1 is a perspective view of a head core block, FIG. 2 and FIG.
FIG. 4 is a perspective view showing an embodiment of the present invention, FIG. 4 is a perspective view of a main part of the same embodiment, FIG. 5 is a side view of a main part of the same embodiment, and FIG. FIG. 7 is an external perspective view, FIG. 7 is a side view of a main part showing a conventional example, FIGS.
The figure is a side view of a main part showing another conventional example. (15)... The first glass layer, (16)... The second glass layer.

Claims (1)

(57) [Claims] 1. A method of manufacturing a floating magnetic head, comprising inserting a magnetic head core chip into a groove of a slider made of a non-magnetic material and then joining the two with glass, the magnetic head core block having a plurality of grooves cut out. Forming a magnetic head core chip by laminating and welding a plurality of types of glass on the upper surface of the magnetic head core block so that the lower glass has a lower softening point, and cutting the magnetic head core block along the plurality of grooves; The magnetic head core chip and the slider by joining the magnetic head core chip and melting the glass by heating the magnetic head core chip. Method.