JPH0689414A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To cope with high densification, miniaturization and obtaining a high output by forming a magnetic core into an annular shape extending from the leading side of a rail part of a slider to the trailing side and fitting a coil on the leading side of the rail part. CONSTITUTION:The leading side coil 12 is wound around a part protruded to the leading side of a floating rail 3 through a coil winding hole 2a and a hollow part of the annular magnetic core 5, and similarly, the trailing side coil 13 is wound around a part protruded to the trailing side of the floating rail 3 through a coil winding hole 2b and the hollow part of the annular magnetic core 5. Moreover, these leading side and trailing side coils 12 and 13 are connected to each other with their ends on the outer side of a slider main body part 1. Magnetic flux is specified for the magnetic core 5 to be generated in the same direction by both coils 12 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying type magnetic head having a flying rail on the surface of a slider facing a magnetic medium, and more particularly to winding a small-sized recording / reproducing winding incorporated in a hard disk drive of a computer. The present invention relates to a levitation type magnetic head for a computer capable of obtaining a large number of wires and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head for a computer,
A C-shaped magnetic core was fixed to the rear end (trailing side) of the flying rail of the magnetic slider, and a recording / reproducing winding was applied to the core through a gap between the C-shaped recess of the core and the rear end of the slider. A monolithic type or a non-magnetic slider is formed with a U-shaped recess transverse to the rear end and a slit along the levitation rail is formed in the rear end of the rail, and a C-shaped core piece is formed in this slit. A composite type in which a magnetic core formed by combining a magnetic core and an I-shaped core piece is inserted and the winding is applied to the magnetic core by utilizing the U-shaped concave portion of the slider and the C-shaped concave portion of the C-shaped core piece. There is. In addition, as shown in FIG. 6, a lower magnetic film 7 serving as a base core is attached to the rear end of the non-magnetic slider 6, and a plurality of coil films 9 are formed on the surface of the lower magnetic film 7 with an insulating film 8 interposed therebetween. Is formed by using, for example, a technique such as electrode film sputtering or photolithography, and the upper magnetic film 10 is formed on the outer surface thereof so as to bridge from the central part of the coil film to the lower magnetic film 7 on the coil outer peripheral side. A thin film type head having an adhesive is also known.

[0003]

In a magnetic disk device for a computer which uses a hard disk as a recording medium, the magnetic head floats above the hard disk, but in order to increase the density and capacity in recent years, the magnetic head is used. Is required to be low, and along with this, head sliders are becoming smaller and lighter. The problem with miniaturization of the magnetic head is the winding coil applied to the magnetic core. In a monolithic or composite type magnetic head, it is necessary to minimize the magnetic resistance of the C-shaped core to which the winding is applied and to shorten the magnetic path so that the recording / reproducing output is not deteriorated. The winding space must be made as small as possible, and as a result, there is a problem that a sufficient number of windings cannot be secured and a required output cannot be obtained. Further, if the winding space is made small and the number of windings is secured with an ultrafine wire, the winding work becomes difficult, and there is a risk of cutting the coil.

On the other hand, in the above-mentioned thin film head, a plurality of coil films formed by the photolithography technique or the like must be stacked to form the magnetic film on the slider, and this work is very complicated, and the coil film In order to increase the number of layers of the coil film, the operation of filling the coil groove every time the coil film is formed to insulate and flatten it and stacking the next coil film on it must be repeated many times. The cost increase was inevitable.

Therefore, according to the present invention, even if the head slider is miniaturized, a sufficient number of windings can be secured as a whole, and a floating magnetic head which can easily obtain a required output and a magnetic head can be easily manufactured by a simple process. It is to provide a method that can be done.

[0006]

According to the present invention, in a levitation type magnetic head having a levitation rail, an annular magnetic core is fixed integrally with the rail and wound on the leading side and the trailing side of the rail. A floating magnetic head is provided in which a wire hole is formed, and a recording / reproducing winding is provided on the leading side and the trailing side of the rail through the winding hole and the hollow portion of the annular magnetic core.

Further, as an example of manufacturing a floating magnetic head according to the present invention, a pair of non-magnetic blocks each having a metal soft magnetic thin film formed on one surface thereof are joined in a sandwich form so that the magnetic thin films contact each other. , The sandwich junction block is divided perpendicularly to the surface of the magnetic thin film, and at least one of the divided blocks is formed with a winding groove perpendicularly penetrating the surface of the magnetic thin film. Both divided blocks are butt-joined with each other by aligning the positions of the thin films, and further, a rail groove is formed so that the magnetic thin film is exposed on one rail surface, and then the winding is provided on the leading side and the trailing side of the rail. By providing a winding through the groove, a two-coil, one-layer core type floating magnetic head can be obtained.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of a floating magnetic head according to an embodiment of the present invention as viewed from the air bearing surface side. The non-magnetic slider main body indicated by reference numeral 1 as a whole has levitation rails 3 and 4 integrally formed on both sides thereof. In FIG. 1, an arrow A indicates the traveling direction of a magnetic recording medium (not shown). The ends of the levitation rails 3 and 4 project in parallel with the running direction of the recording medium on both the leading side and the trailing side with respect to the magnetic recording medium, and have a vertical length from the leading side to the trailing side. A hole (lateral hole) 2 passes through the slider body 1 from the side portion 3a of the levitation rail 3 to the side portion of the other levitation rail 4. As will be described later, a portion near the leading side and a portion near the trailing side of the through hole 2 in one of the levitation rails 3 are winding holes 2a and 2b, respectively.

A thin annular magnetic core 5 having a side surface shape substantially the same as the side surface shape of the rail is fixed to one of the levitation rails 3 so as to be sandwiched in the rail 3. As shown in the figure, the magnetic core 5 is exposed on the rail surface 3b of the levitation rail 3 and is magnetically cut on the rail surface on the trailing side of the rail 3 perpendicularly to the running direction of the magnetic recording medium. The magnetic gap 11 is formed by the cut portion. The leading side coil 12 is wound around the part of the levitation rail 3 protruding toward the leading side through the winding hole 2a and the hollow part of the annular magnetic core 5. Similarly, the part of the levitation rail 3 protruding toward the trailing side is wound. The trailing coil 13 is wound around the winding hole 2b and the hollow portion of the annular magnetic core 5. The leading side and trailing side coils 12 and 13 are connected to each other outside one end of the slider body 1. Both coils 12, 13
The winding direction and the connection of the ends are determined by the coils 12 and 13 so that magnetic flux in the same direction is generated in the magnetic core 5. The magnetic core 5 includes not only a thin plate-shaped core piece but also a magnetic thin film core.

FIG. 2 is a perspective view of a floating magnetic head according to another embodiment of the present invention. In this embodiment, three levitation rails 3, 4 and 14 projecting in the hollow state on the leading side and the trailing side are formed on both sides and the center of the hollow non-magnetic slider body 1, respectively. A thin annular magnetic core 5 having a side surface shape substantially the same as that of the central rail is sandwiched and fixed to 14. A hole 2 is formed in the side portion of each rail 3, 4, 14 and in the non-magnetic slider body 1 in a direction transverse to the extending direction of the rail, and an end of the central rail 14 protruding from the slider body 1 is formed. Hole 2 at the position is winding hole 2
c, 2d. As described with reference to FIG. 1, the thin core piece or the thin-film magnetic core 5 is magnetized on the rail surface 14a on the trailing side of the central rail 14 at right angles to the running direction of the magnetic recording medium (direction of arrow A in FIG. 2). And the magnetic gap 11 is formed by the cut portion. Then, the leading-side coil 12 is wound around the rail end through the winding hole 2c of the rail end protruding toward the leading side of the center rail 14 and the hollow portion of the annular magnetic core 5, and the center rail 14 protruding toward the trailing side.
The coil 13 on the trailing side is wound through the winding hole 2d and the hollow portion of the magnetic core 5,
One ends of the three are connected to each other outside the slider.

FIG. 3 is a perspective view showing a manufacturing process of the two-rail type floating magnetic head shown in FIG. First, as shown in FIG. 3 (A), a block 1 having a rectangular parallelepiped shape is made of a non-magnetic material.
5 is cut out, and each surface is chamfered (mirror surface). Next, a metal soft magnetic thin film 16 is attached to one surface of the non-magnetic block 15 in a single layer or multiple layers by a sputtering technique or the like, and finally the surface layer is subjected to glass sputtering (FIG. 3B). A block on which such a magnetic thin film 16 is formed is attached to the magnetic thin film 16
Of the magnetic thin film 16 are welded and bonded together via glass spatter so that the upper surfaces of the magnetic thin films 16 face each other, as shown in FIG. 3C. The joining block 17 in which the thin film 16 is sandwiched is obtained. Next, this sandwich-shaped junction block 17 is divided into two bodies perpendicular to the surface of the magnetic thin film 16 to obtain division blocks 18 each having a rectangular parallelepiped shape as shown in FIG. Then, each divided block 18 is processed into a predetermined bulk size, and further, the magnetic thin film 16 is vertically penetrated to one side surface of each divided block 18 so as to have a U-shaped outer shape as a whole as shown in FIG. 3 (E). Winding groove 19, 20
And one side edge of each winding groove opening intersecting with the magnetic thin film 16 is scraped off to the inclined surfaces 21 and 22 as shown in the drawing. Such two divided blocks 18 are weld-bonded so that the winding groove openings thereof face each other and the positions of the magnetic thin films 16 on both sides match (FIG. 3 (F)).
By this joining, the U-shaped magnetic thin films 16 of both blocks become annular, and a hollow slider semi-finished product 23 in which the annular magnetic thin films 16 are sandwiched from both sides by a non-magnetic material is obtained. The welded glass 24 is embedded between the inclined surfaces 21 and 22 of the winding groove openings where the two blocks 18 are butted against each other, and the magnetic gap 16 (see FIG.
(See) is formed.

Next, the surface of the slider semi-finished product 23 on the magnetic recording medium contact surface side (magnetic gap side) is covered with the magnetic thin film 16.
The magnetic thin film 1 so that the magnetic field is located near one side of the surface.
Grooves are formed in parallel with 6 to form a pair of levitation rails 3 and 4 on both sides (FIG. 3 (G)). The magnetic thin film 16 is sandwiched between the one rails 3 and exposed on the rail surface. After that, the front and rear centers of the slider semi-finished product 23 are cut off so that both ends of both rails 3 and 4 project in the rail extension direction, and the head slider 30 is completed as shown in FIG. The magnetic gap 11 appears at a position closer to the trailing side of the rail 3 on one side. The coils 12 and 13 are mounted on the leading side and the trailing side respectively through the winding grooves 19 and 20 of the rail 3 on one side and the hollow portion of the magnetic thin film 16 as described in FIG. 1, and one ends 12a and 13a of the coils are attached. The floating magnetic head of the embodiment shown in FIG. 1 is completed by connecting the blades.

The three-rail type magnetic head shown in FIG. 2 can be obtained by substantially the same manufacturing process as described above.
When the rail groove is processed from the slider semi-finished product 23 of FIG. 3 (F), three rails may be processed so that the metal soft magnetic thin film is sandwiched between the central rails.

When the entire non-magnetic slider including the rail portion is formed to be hollow as in the above-described embodiments, the weight of the slider can be reduced, but if the overall thickness is too thin, each portion of the slider, especially The strength of the rail side parts will be weakened, causing breakage and cracks. Therefore, after the hollow head slider is completed or during the slider manufacturing process of FIG. 3, the slider main body and the rail central portion are made of non-magnetic material except for the winding groove portions on the leading side and trailing side of the flying rail. You may embed it.
FIG. 4 shows an embodiment in this case, in which the non-magnetic slider main body 25 has a solid shape, and the non-magnetic material 26 is filled in the central portions of the levitation rails 3 and 4 on both sides. Both rails 3,
Since the winding holes 2a and 2b are left at the projecting ends of the leading side and the trailing side of 4, the leading side coil 12 and the trailing side coil 13 are provided at both ends of one rail 3 through these holes. Wrapped around.

FIG. 5 is a perspective view showing still another embodiment of the present invention. In this embodiment, the facing side (rail side) of the magnetic recording medium including the rail portion is a front slider 27 made of a non-magnetic material, and the opposite side is a back slider 28 made of a ferromagnetic oxide such as ferrite. It has the form of Both ends of the pair of rails 3 and 4 project from the slider main body to the leading side and the trailing side, and a through hole 2 is formed from one side of the levitation rail 3 to the side of the other rail 4 to form a rail side surface. Similar to the embodiment of FIG. 1, the annular magnetic core 5 having substantially the same shape is sandwiched between the rails 3. On the rail surface of the rail 3 on the trailing side, the magnetic gap 1 is formed in the magnetic core 5.
1 is formed. Both ends of the through hole 2 on the side of the rail 3 where the magnetic core 5 is provided are winding holes 2a and 2b, through which the coils 12 and 13 are applied to the rail protruding ends on the leading side and the trailing side, respectively.

The hollow portion of the annular magnetic thin film or the annular magnetic core according to the present invention extends from near the leading end of the rail to near the trailing end of the rail, and the magnetic path length of such a core portion is long. The magnetic resistance increases accordingly. However, in the embodiment of FIG. 5, since the back slider on the side opposite to the rail surface is made of a ferromagnetic material as described above, the magnetic resistance of the magnetic core is small even if the magnetic path length is long, and a sufficient impedance should be taken. Therefore, high output recording / reproducing operation becomes possible in combination with the coils on both the reading side and the trailing side. The composite slider 2 shown in FIG.
In No. 9, a rectangular parallelepiped composite block is cut out from a composite substrate in which a non-magnetic material and a ferromagnetic material are joined, and this composite block can be easily obtained by the same process as described in FIG. As a modification of the embodiment shown in FIG. 5, it is of course possible to adopt a three-rail type structure, or to increase the strength by filling the slider and the rail central portion with a non-magnetic material. It is obvious that the modified examples are included.

[0017]

As described above, according to the present invention, the magnetic core has an annular shape extending from the leading side of the slider rail portion to the trailing side, and windings are provided on the leading and trailing sides of the rail portion. As a result, even if the slider is made small and each winding hole is made small, a sufficient number of turns can be secured as a whole, the required output can be easily obtained, and high density, small size, and high output can be achieved. A corresponding magnetic head for a computer can be realized. Since the annular magnetic core is also integrated with the rail portion of the slider and can be obtained at the same time when the winding groove of the rail portion is processed, it is easy to manufacture in a simple process.

[Brief description of drawings]

FIG. 1 is a perspective view of a levitation type magnetic head according to an embodiment of the present invention as viewed from the air bearing surface side.

FIG. 2 is a perspective view similar to FIG. 1 of a flying magnetic head according to another embodiment of the present invention.

FIG. 3 is a diagram showing an example of a manufacturing process of a floating magnetic head according to the present invention.

FIG. 4 is a perspective view of a solid slider type flying magnetic head according to still another embodiment of the present invention.

FIG. 5 is a perspective view of a composite slider type magnetic head according to another embodiment of the present invention.

FIG. 6 is a perspective view of a typical conventional thin film magnetic head.

[Explanation of symbols]

 1 Non-Magnetic Slider Main Body 2 Holes 2a, 2b, 2c, 2d Winding Holes 3, 4, 14 Flying Rail 5 Magnetic Core 11 Magnetic Gap 12 Leading Side Coil 13 Trailing Side Coil 29 Composite Slider

Claims (5)

[Claims] 1. A levitation type magnetic head having a levitation rail, wherein an annular magnetic core is integrally fixed to the rail,
Winding holes are formed on the leading side and the trailing side of the rail, and recording / reproducing windings are formed on the leading side and the trailing side of the rail through the winding hole and the hollow portion of the annular magnetic core. Characteristic levitation type magnetic head. 2. The flying magnetic head according to claim 1, wherein the rail is formed by a hollow non-magnetic slider. 3. A composite slider comprising a non-magnetic material and a ferromagnetic material, wherein the rail surface of the rail is formed on the non-magnetic material side of the composite slider. Floating magnetic head. 4. The hollow portion of the annular magnetic core has a middle portion thereof filled with a non-magnetic material except for the leading side and the trailing side of the rail. The floating magnetic head described in 1. 5. The levitation type magnetic head according to claim 1, wherein the magnetic core is formed of a magnetic thin film.