JPH05342792A - Manufacture of floating type magnetic head and floating type magnetic head - Google Patents

Abstract

PURPOSE:To obtain a method for manufacturing a composite-type head slider of a head for a floating type magnetic disk in which the steps of forming a magnetic conversion core head sealing-glass groove and installing a glass rod therein, can be efficiently conducted by less number of steps. CONSTITUTION:One glass groove 53 is formed on a slider block 51, one glass rod is installed therein, and then melted to seal a plurality of magnetic conversion head cores 3. Accordingly, as compared with prior art of cutting a slider block, where forming a single head slider, then forming a glass groove on the head and installing a glass rod therein, the number of the steps can be reduced. Since a longer glass rod may be handled as compared with prior art, installing and temporarily fixing of the rod are facilitated. Further, dams 53a, 53b are formed at both ends of the groove 53, and a malfunction due to flow-out of the melted glass from the groove 53 can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying magnetic disk head used in a hard disk drive or the like and a method for manufacturing the same, and more specifically, a method for manufacturing a slider of a so-called composite type floating magnetic head for a magnetic disk. And a magnetic head.

[0002]

2. Description of the Related Art FIG. 9 shows a general structure of a composite type head slider in a flying magnetic disk head. As shown in this figure, the head 1
Is composed of a slider 2 which is a non-magnetic ceramic product, and a transducer 5 in which a winding 4 is wound around a magnetic conversion head core 3 made of a magnetic material such as ferrite. In this ceramic slider 1,
On the surface 1a facing the magnetic disk surface (not shown), a groove portion 6 is formed substantially in the center along the track direction, and a pair of rail surfaces 7 and 8 are formed on both sides thereof. Is the ABS surface (levitation surface). In addition, from the end face 9 on the air outflow side of the head 1 to the side face 11 adjacent to it.
Toward the side, the corners are horizontally cut into a triangular shape with a constant width, and a winding groove 12 for winding the winding 4 around the magnetic conversion head core 3 is formed. Further, from the end face 9 on the air outflow side, an insertion groove 13 for inserting a head core is formed so as to cross the winding groove 12 in the air inflow direction, and the magnetic conversion head core 3 is inserted therein. It is sealed.

Here, the head slider 1 having such a structure is manufactured as follows. First, as shown in FIG. 7, a slider block 21 having a rectangular parallelepiped shape capable of cutting out a plurality of head sliders is manufactured by a dry molding method or an injection molding method. A winding groove 12 and a head core insertion groove 13 are simultaneously formed in the slider block 21 by molding.

Next, this slider block 21 is shown in FIG.
A plurality of head slider unit blocks, that is, four head slider unit blocks in the example shown in the figure, are cut out by cutting along the cutting line indicated by the alternate long and short dash line. Groove processing is performed on the floating surface of each head slider unit block to form a pair of rails 70 and 80, and a top surface portion of one rail 70 in which the upper end opening of the insertion groove 13 is exposed. A groove (V groove) 14 having a V-shaped cross section for sealing the head core is formed therein. FIG. 8 shows the overall shape of the head slider unit 22 obtained as a result.

After that, a glass rod (not shown) is adhered in the glass groove 14 with an adhesive or the like, the head core 3 is inserted in the head core insertion groove 13, and then the glass rod is melted. By doing so, the head core 3 is sealed in the insertion groove 13. Finally, the head slider 1 shown in FIG. 9 is obtained by grinding and polishing the floating surface by a predetermined amount.

[0006]

There are the following problems to be solved in the manufacture of the head slider carried out by such a procedure.

First, after cutting out each head slider unit 22 from the slider block 21, it is necessary to form one glass groove 14 for each head slider unit 22 and to temporarily secure the glass rods thereto. There is. It is complicated and inefficient to perform the same processing steps on each head slider in this way. Further, the glass groove 14 has a narrow width of, for example, about 150 microns, and the glass rod to be placed therein is also very thin. Therefore, the glass rod should be accurately placed in the glass groove and temporarily fixed there. Is a difficult task.

Secondly, when the glass rod is melted, the molten glass may drip from both ends of the V groove in which it is placed. When the glass drips, it adheres to the side surface of the head slider and becomes a defective product. For this reason, there arises a problem that the yield is deteriorated. It is difficult to manufacture a V-groove structure that prevents glass from dripping by grinding.

An object of the present invention is to propose a manufacturing method capable of solving the problems of the conventional manufacturing method of the composite type magnetic head. The present invention also provides a magnetic head manufactured by this new method.

[0010]

In order to solve the above-mentioned problems, in the present invention, a composite structure head constituting a floating magnetic head is manufactured by the following procedure.

First, a slider block sintered body in which a winding groove of a magnetic conversion head core is formed is formed by using a dry molding method, an injection molding method, or the like. Next, a glass groove for mounting a glass rod used for sealing the magnetic conversion head core is formed on the slider block sintered body. The glass groove is formed here along the edge on the air outflow side of the surface of the slider block that faces the recording medium in a direction substantially orthogonal to the air outflow direction. The insertion groove for inserting the head core can be integrally formed here at the time of molding the above-mentioned sintered body, but it is preferable to form the head core insertion groove by grinding of several μm.

Next, after mounting the glass rod in the glass groove and inserting the head core in the head core insertion groove,
The head core is sealed in the head core insertion groove by melting the glass rod.

After that, the surface of the slider block facing the recording medium is ground to form a floating surface, and the slider block is cut into individual head sliders. Alternatively, the slider block may be cut into individual head sliders, and then the floating surface may be formed on each head slider. Here, when molding the slider block sintered band by using the injection molding method, it is preferable that the glass groove has such a shape that the molten glass at the time of sealing the core does not flow out from the glass groove to the outside. Can be molded into

[0014]

When the method of the present invention is adopted, only one glass grooving process is performed on the slider block for manufacturing a plurality of head sliders.
Also, a glass rod is attached there and temporarily fixed. Therefore, these operations can be simplified and made more efficient than in the conventional case where glass head grooving and temporary fixing of glass rods are performed on individual head sliders cut out from the slider block. Also,
The glass rod can be mounted exactly in the glass groove.

Further, when a glass rod having a shape in which a molten glass rod does not flow out is adopted as the glass groove, a defective product is generated due to the molten glass flowing out. Can be avoided. Furthermore, when the head core insertion groove is formed by grinding, the insertion groove can be formed more accurately than when it is formed by molding.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an example of a method of manufacturing a composite type head according to the method of the present invention. The method of this example uses a dry molding method. Further, the finally obtained head slider becomes the head 1 having the shape shown in FIG. 9 through the intermediate body shape shown in FIG.

First, as shown in FIG. 1, a slider block sintered body 41 having a rectangular parallelepiped shape of a size capable of cutting out four head sliders is molded by a dry molding method. At this time, using a triangular core, a winding groove 12 for winding the winding 4 around the magnetic conversion head core 3 opened at the air outflow side end surface of the head slider is integrally formed. In this slider block sintered body 41,
The levitation surface 1a of the head 1 is formed on the upper surface 42 in the figure, and the arrow direction is the air inflow direction with respect to the slider block sintered body.

Next, as shown in FIG. 2, the upper surface 42 of the slider block sintered body 41 is ground to form a glass groove 43 for sealing the magnetic conversion head core 3. The glass groove 43 has a rectangular cross section, and the upper surface 42
At a position close to the edge with the end face 44 on the air outflow side in the above, it is formed over the entire width in the longitudinal direction of the upper surface 42 in the direction orthogonal to the air inflow direction.

After this, as shown in FIG. 3, insertion grooves 13 for inserting the vertically extending magnetic conversion head core 3 are formed in four positions by cutting so as to hang on the winding grooves 12.

After the insertion groove 13 is formed, each insertion groove 13
The magnetic head core 3 is inserted in the glass groove 4
A glass rod (not shown) is put in 3 and temporarily fixed, and the glass rod is melted to seal the magnetic head core 3 in the insertion groove 13.

Thereafter, the slider block sintered body 41 is cut at the position indicated by the one-dot chain line in FIG. 3 to cut out the four head slider single bodies 10 having the pair of rails 70 and 80 (FIG. 4). ). Then, the upper surface 42 of each head slider unit block is shaved to form the levitation surface 1a on which the rails 7 and 8 are formed. As described above, the magnetic head 1 shown in FIG. 9 through FIG. 4 is manufactured. As shown in FIG. 9, the sealing glass does not remain on the rails 7 and 8 of the head 1 facing the magnetic recording medium by normal grinding, but the sealing glass 50 shown in FIG. It may remain in the final product shown in 9. In other words, the glass sealing surface 50 may be formed along the side surface on the air outflow side and extend entirely or partially (rail portion) in the direction substantially orthogonal to the air inflow direction.

In the manufacturing method of this example, one glass groove 43 is formed in the slider block 41, one glass rod is installed in the glass groove 43, and then the glass rod is melted to form a plurality of magnetic fields. The conversion head core 3 is sealed. Therefore, the number of processing steps is reduced as compared with the conventional case where the slider block is cut out to form the head slider single body, and then each head slider single body is subjected to glass grooving and glass groove installation work. be able to. Further, since it is only necessary to handle a glass rod that is longer than in the conventional case, there is an advantage that installation and temporary fixing work of the glass rod can be facilitated. Further, according to the method of this example, the insertion groove 13 for inserting the magnetic conversion head core is formed in the slider block 41 by grinding. Therefore, the insertion groove can be formed more accurately than in the conventional case where the insertion groove is formed by dry molding or injection molding.

Next, FIGS. 5 and 6 show another method according to the present invention. The method of this example is different from the method of the above-described embodiment in that the slider block is molded by using the injection molding method. Further, the point that the glass groove is formed in the slider block at the same time during the injection molding, and the shape of the glass groove to be formed are different from those in the above-mentioned embodiment. Since the other points are the same as those of the above-described embodiment, the description thereof will be omitted.

More specifically, in this example, the slider block 51 having the shape shown in FIG. 5 is formed and sintered by an injection molding method. As can be seen from this figure, the slider block 51 has four winding grooves 12 on the upper surface 42,
A glass groove 53 for inserting a glass rod is formed. The formation position of the glass groove 53 is the same as that in the above-mentioned embodiment. However, in this example, the glass groove 53 is not formed over the entire width of the upper surface 42 in the longitudinal direction, but is stopped at positions near both ends thereof. Thereby, the glass groove 53
At both ends of the weirs 53a, 54b having the same height as the upper surface 42
Are formed. The glass groove 53 having such a shape is
It can be suitably formed by an injection molding method.

The following steps are the same as in the above embodiment, and as shown in FIG. 6, the insertion grooves 13 of the four magnetic conversion head cores are formed by shaving. After that, a glass rod is installed in the glass groove 53 and temporarily fixed, and
After inserting the magnetic conversion head core 3 into each of the insertion grooves 13, the head core 3 is sealed in the insertion groove 13 by melting the glass rod.

In this glass melting step, the glass melted in the shape of the glass groove 43 of the structure of FIG. 3 of the above-mentioned embodiment may flow out from both ends thereof. However, in this example, the weir 53 is provided at both ends of the glass groove 53.
Since a and 53b are formed, it is possible to prevent molten glass from flowing out to the outside due to these portions. Therefore, it is possible to prevent defective products from being produced due to the molten glass flowing out. Therefore, if the glass groove is formed as in this example, the head slider can be formed with good yield.

In the above two embodiments, after sealing the magnetic conversion head core by melting the glass rod,
Each head slider is cut out after the rail is formed by scraping the upper surface. Conversely, after the magnetic conversion head core is sealed, each head slider may be cut out from the slider block, and then the floating surface of each head slider may be processed.

[0029]

As described above, in the method of the present invention, one glass groove is formed in the slider block, the glass rod is installed in the glass groove, and then the glass rod is melted to form a plurality of glass grooves. The magnetic conversion head core of is sealed. Therefore, as in the past, after cutting out the slider block to form the head slider unit, glass grooving is performed on each head slider unit,
In addition, the number of processing steps can be reduced and efficiency can be improved as compared with the case where a glass rod is installed there. Further, since it is only necessary to handle a glass rod that is longer than in the conventional case, there is an advantage that installation and temporary fixing work of the glass rod can be facilitated.

Further, in the method of the present invention, when the glass groove has a shape in which the molten glass does not flow out, a defective product may be caused due to the molten glass flowing out from the groove to the outside. Since the occurrence can be avoided, the head slider can be manufactured with high yield.

Further, when the head core insertion groove is formed by grinding, there is an advantage that the insertion groove can be formed with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a slider block molded by a dry molding method in a method of manufacturing a magnetic head to which the present invention is applied.

FIG. 2 is a perspective view showing a state where a glass groove is formed on the upper surface of the slider block of FIG.

FIG. 3 is a perspective view showing a state in which an insertion groove of a magnetic conversion head core is processed in the slider block of FIG.

FIG. 4 is a perspective view showing a head slider alone which is an intermediate of a magnetic head processing step obtained by the present invention.

FIG. 5 is a perspective view showing a slider block molded by an injection molding method in a method of manufacturing a magnetic head to which the present invention is applied.

6 is a perspective view showing a state where an insertion groove of a magnetic conversion head core is processed in the slider block of FIG.

FIG. 7 is a perspective view showing a slider block in a conventional manufacturing method.

8 is a perspective view showing a head slider alone obtained by cutting out the slider block shown in FIG. 7. FIG.

9 is a perspective view showing a final magnetic head obtained by processing the head slider alone shown in FIGS. 4 and 8. FIG.

[Explanation of Codes] 1 ... Magnetic head 1a ... Levitation surface 2 ... Slider 3 ... Magnetic conversion head core 4 ... Winding 6 ... Groove 7, 8 ... Rail (ABS 9) End surface 10 ... Head slider single body 12 ... Winding groove 13 ... Insertion groove 22 ... Head slider single body 41 ... Slider block 42 ... Top surface 43 ... Glass Groove 50 ... Sealing glass 51 ... Slider block 53 ... Glass groove 53a, 53b ... Weir at both ends of glass groove

Claims (8)

[Claims] 1. A method of manufacturing a floating magnetic head having a slider having a composite structure, comprising a step of forming a slider block sintered body in which a winding groove of a magnetic conversion head core is formed, and the slider block sintering. A glass groove for mounting a glass rod for sealing the magnetic conversion head core to the body is provided along the air outflow direction along the air outflow side edge of the surface of the slider block that faces the magnetic recording medium. Is a glass groove forming step formed in a direction substantially orthogonal to the glass groove, and a glass rod is mounted in the glass groove, and a head core is inserted into a head core insertion groove formed in the slider block to melt the glass rod. And a head core sealing step of sealing the head core in the head core insertion groove by manufacturing the flying magnetic head. Method. 2. The method for manufacturing a flying magnetic head according to claim 1, wherein the slider block is formed by a dry molding method. 3. The method of manufacturing a flying magnetic head according to claim 1, wherein the slider block sintered body having the glass groove is formed in the same step by an injection molding method. 4. The method according to any one of claims 1 to 3,
A method for manufacturing a floating magnetic head, wherein the glass groove has a shape such that the glass melted in the core sealing step does not flow out of the glass groove to the outside. 5. The method according to claim 2, wherein
A method of manufacturing a flying magnetic head, wherein the head core insertion groove is formed by grinding a molded slider block sintered body. 6. The method according to any one of claims 1 to 5,
A method of manufacturing a floating magnetic head, wherein a long slider block sintered body is obtained, and after the head core sealing step, the slider block is cut to obtain a floating magnetic head. 7. A levitation type magnetic head manufactured by the method according to claim 1. 8. A levitation type magnetic head, wherein a slider is sealed with a head core for magnetic conversion, and the magnetic recording medium facing surface extends along an edge on the air outflow side in a direction substantially orthogonal to the air outflow direction. A floating magnetic head in which an existing glass sealing surface is formed, and the head core is sealed by the glass sealing surface.