JPH0744846A - Floating magnetic head and manufacturing method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] A floating magnetic head with a small frequency characteristic of low inductance (L) and suitable for high-density recording, and no peeling of the back gap even if the thickness of the magnetic head core is reduced. An object of the present invention is to provide a method of manufacturing a floating magnetic head having high quality, excellent durability and high product yield. A floating magnetic head having a magnetic head core 4 bonded to one side of a slider 1, the back gap portion 4b or the back gap portion 4 of the magnetic head core 4.
b and the front gap portion 4a are both the slider 1
It has a structure adhered to.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head used for recording and reproducing data on a hard disk drive and the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, a hard disk drive, which is an auxiliary storage device of a computer, has been actively developed in a small size and a large capacity. Specifically, in order to increase the track density on the magnetic disk, narrowing the track width of the floating magnetic head has been studied. For example, Japanese Patent Application Laid-Open No. 3-34114 discloses a floating magnetic head having a structure in which a thin magnetic head core is bonded to one side of a slider.

A conventional floating magnetic head will be described below. FIG. 6 is an overall perspective view of a conventional floating magnetic head. 1 is a slider made of ceramics or the like, 2 and 3
Is a pair of levitation rails formed on the surface of the slider 1 facing the magnetic disk, 4 is a magnetic head core adhered to one side of the slider 1 by glass or the like, and 4a is data formed on the magnetic head core 4 for recording and reproducing data. A front gap portion 4b, a back gap portion of the magnetic head core 4, a window hole portion 5 through which a wire rod of the winding of the magnetic head core 4 is passed,
6, the winding of the window hole 5 of the magnetic head core 4 is the slider 1
A cutout portion is formed by cutting out a side portion of the slider 1 so as not to come into contact with the slider 1. Reference numeral 7 is an adhesive glass layer in which the magnetic head core 4 is adhered to the slider 1.

In the floating magnetic head constructed as described above, since a thin magnetic head core 4 is bonded to one side of the non-magnetic slider 1, information can be recorded and reproduced up to the outer peripheral side of the magnetic disk. Is. Further, since the inductance (L) can be reduced by reducing the thickness of the magnetic head core 4 to about 0.1 to 0.3 mm, it is possible to record and reproduce at a high frequency.

[0005]

However, in the above-mentioned conventional structure, the inductance (L) of the magnetic head core 4 is increased.
If the thickness of the magnetic head core 4 is reduced in order to reduce the size of the magnetic head core 4, there is a problem that the back gap portion 4b having weak mechanical strength is easily peeled off and the product yield is low.

The present invention solves the above-mentioned problems of the prior art. Even if the magnetic head core 4 and the floating magnetic head having a small frequency characteristic of small inductance (L) and suitable for high density recording are thinned. An object of the present invention is to provide a method for manufacturing a floating magnetic head, which does not cause peeling of a back gap portion, has high quality, is excellent in durability, and has a high product yield.

[0007]

In order to achieve this object, a floating magnetic head according to claim 1 of the present invention comprises:
A floating magnetic head having a magnetic head core adhered to one side of a slider, wherein a back gap part of the magnetic head core is adhered to the slider. A floating magnetic head according to a second aspect of the present invention is the floating magnetic head according to the first aspect, wherein the front gap portion of the magnetic head core is bonded to the slider. The method for manufacturing a floating magnetic head according to claim 3 is a method for manufacturing a floating magnetic head in which a magnetic head core is bonded to one side of a slider, wherein one side of a slider bar having a levitation rail is formed. An adhesive glass layer forming step of forming an adhesive glass layer for adhering the magnetic head core to the magnetic head core, a slider bar cutting step of forming the adhesive glass layer and cutting the slider bar to form a slider bar, and the step of The gap reinforcing portion forming step of forming a gap reinforcing portion for reinforcing the gap portion of the magnetic head core on the slider obtained in step, and bonding the magnetic head core to the bonding glass layer surface of the slider on which the gap reinforcing portion is formed And a magnetic head core adhering step.

By adhering the gap reinforcing portion of the slider to the magnetic head core, the front gap portion and the back gap portion as well as the joint portion of the non-magnetic material adhered for shortening the magnetic path are reinforced. Therefore, peeling of this portion can be prevented.

[0009]

With this structure, even if the thickness of the magnetic head core is reduced, the back gap portion of the magnetic head core is adhered to and reinforced with the slider, so that the back gap portion can be prevented from peeling off. Also, by bonding the front gap part of the magnetic head core and the slider,
The track width can be narrowed easily.

[0010]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is an overall perspective view of a floating magnetic head according to a first embodiment of the present invention.
FIG. 3B is a perspective view of a main part of the magnetic head core of the floating magnetic head according to the first embodiment of the present invention. 1 is a slider, 2 and 3 are levitation rails, 4 is a magnetic head core, and 4a
Is a front gap portion, 4b is a back gap portion, 5 is a window hole portion, and 6 is a cutout portion. Since these are the same as in the conventional example, the same reference numerals are given and description thereof is omitted. Reference numeral 4c is a non-magnetic material bonded to shorten the magnetic path of the magnetic head core 4, and 8a is a back gap reinforcing portion formed on the slider 1 to prevent the back gap portion 4b of the magnetic head core 4 from peeling off.

The manufacturing method of the floating magnetic head of this embodiment having the above-described structure will be described below. First, the process of forming the magnetic head core 4 will be described with reference to FIG.
2A is a perspective view showing a process of forming a magnetic head core bar of a floating magnetic head according to the first embodiment of the present invention, and FIG. 2B is a floating type according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a magnetic head core bar cutting step, FIG.
FIG. 3C is a perspective view showing a side mirror surface finishing step of the magnetic head core of the floating magnetic head according to the first embodiment of the invention. Reference numeral 9 is a gap bar formed by processing a ferrite material into a predetermined shape to shorten the magnetic path and forming a gap portion. Reference numeral 10 is a magnetic field formed by joining a non-magnetic material 4c such as ceramic to the gap bar 9 with glass or the like. The head core bar 11 is an adhesive side part that adheres to the slider 1 of the magnetic head core bar 10. As shown in FIG. 2B, the magnetic head core bar 10 formed by joining the non-magnetic material 4c to both sides of the gapped bar 9 as shown in FIG. The magnetic head core 4 is obtained by cutting with a thickness. Next, as shown in FIG. 2C, the bonding side portion 11 is mirror-finished in order to bond the magnetic head core 4 to the slider 1.

Next, the step of forming the slider 1 will be described with reference to FIG. 3A is a perspective view showing a process of forming a flying rail of a slider of a floating magnetic head in a first embodiment of the present invention, and FIG. 3B is a first view of the present invention.
FIG. 3C is a perspective view showing a step of cutting the slider bar of the floating magnetic head in the embodiment of the present invention, and FIG. 3C shows a step of forming a back gap reinforcing portion of the floating magnetic head in the first embodiment of the present invention. It is a perspective view. As shown in FIG. 3A, the levitation rails 2 and 3 are formed on the slider bar 1a made of a non-magnetic material such as calcium titanate, and then the side surface on the levitation rail 2 side to which the magnetic head core 4 is bonded is mirror-finished. Apply processing. Next, as shown in FIG. 3B, an adhesive glass layer 7 for welding the magnetic head core 4 to the side surface of the levitation rail 2 which is mirror-finished by sputtering or the like.
To form a film. The slider bar having the adhesive glass layer 7 formed thereon is cut into a length of 2 to 4 mm, and then a back gap reinforcing portion 8a is formed at the end of the slider 1 using a diamond grindstone or the like as shown in FIG. 3 (c). Form. Next, the bonding and finishing of the magnetic head core 4 and the slider 1 will be described with reference to FIG. FIG. 4A is a perspective view showing a step of adhering the magnetic head core block of the floating magnetic head to the slider according to the first embodiment of the present invention.
FIG. 3B is a perspective view showing a finishing process of the floating magnetic head according to the first embodiment of the present invention. As shown in FIG. 4A, the mirror-finished bonding side portion 11 of the magnetic head core 4 and the bonding glass surface of the slider 1 are bonded together,
The glass layer for bonding 7 is melted and bonded in an electric furnace at 0 to 700 ° C. Next, the side portion of the magnetic head core 4 is finished to a predetermined thickness by grinding, lapping or the like. Further, the back surface is ground to finish to a predetermined back gap size. Next, in order to regulate the track width (TW) of the magnetic head core 4, a predetermined groove is formed on the front gap side joint portion between the magnetic head core 4 and the slider 1, and then the magnetic head core 4
Slope processing is performed on the front gap side using a cup-shaped diamond grindstone or the like. Further, chipping or the like is likely to occur on the ridge lines of the floating rails 2 and 3 of the slider 1, and chamfering is performed as necessary.

As described above, according to this embodiment, since the slider 1 and the magnetic head core 4 are bonded to each other, the step of performing the thickness and chamfering processing of the magnetic head core 4 is included. Back gap part 4
Since the peeling of b and the non-magnetic material 4c from the joint portion can be greatly reduced, the yield is high, the manufacturing method is excellent in mass productivity, and the inductance (L) can be reduced by thinning the magnetic head core 4, so that it is high. It is possible to provide a floating magnetic head capable of recording and reproducing at a frequency.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is an overall perspective view of the floating magnetic head according to the second embodiment of the present invention. The difference from the first embodiment is that not only the back gap portion 4b but also the front gap portion 4a of the magnetic head core 4 is bonded and reinforced to the front gap reinforcing portion 8b provided in the slider 1. In this structure, winding work is slightly more difficult than that of the floating magnetic head of the first embodiment, but the front gap portion 4a is also bonded to the outer levitation rail 2, so that the side portion of the magnetic head core 4 which is not the slider 1 bonding surface. By chamfering, the track width (TW) can be easily regulated and the chipping of the track portion hardly occurs, so that the track width (TW) can be reduced to about 1 μm.

As described above, according to this embodiment, the first embodiment
Similarly, it is possible to provide a manufacturing method having a high yield and excellent mass productivity, and a floating magnetic head suitable for high-density recording and reproduction.

[0016]

As described above, the present invention has a structure in which the back gap portion of the magnetic head core or both the back gap portion and the front gap portion is adhered to the slider, so that the gap is reduced when the track width is narrowed. It is possible to drastically reduce the peeling of the joint between the part and the non-magnetic material, the manufacturing method of the floating magnetic head with high product yield, low cost and excellent mass productivity, and recording / reproducing at high frequency with small inductance. It is possible to realize a floating magnetic head suitable for possible high-density recording.

[Brief description of drawings]

FIG. 1A is an overall perspective view of a floating magnetic head according to a first embodiment of the present invention. FIG. 1B is a perspective view of a main portion of a floating magnetic head core according to a first embodiment of the present invention.

FIG. 2A is a perspective view showing a magnetic head core bar forming process of the floating magnetic head according to the first embodiment of the present invention. FIG. 2B is a magnetic head of the floating magnetic head according to the first embodiment of the present invention. (C) A perspective view showing a side mirror surface finishing step of the floating magnetic head core in the first embodiment of the present invention.

FIG. 3A is a perspective view showing a process of forming a floating rail of a floating magnetic head according to the first embodiment of the present invention. FIG. 3B is a slider bar of the floating magnetic head according to the first embodiment of the present invention. (C) A perspective view showing a back gap reinforcing portion forming step of the floating magnetic head according to the first embodiment of the present invention.

FIG. 4A is a perspective view showing a magnetic head core block bonding step of the floating magnetic head according to the first embodiment of the present invention. FIG. 4B is a finishing process of the floating magnetic head according to the first embodiment of the present invention. Perspective view showing steps

FIG. 5 is an overall perspective view of a floating magnetic head according to a second embodiment of the invention.

FIG. 6 is an overall perspective view of a conventional floating magnetic head.

[Explanation of symbols]

 1 Slider 1a Slider bar 2, 3 Levitating rail 4 Magnetic head core 4a Front gap part 4b Back gap part 4c Non-magnetic material 5 Window hole part 6 Excision part 7 Adhesive glass layer 8a Back gap reinforcing part 8b Front gap reinforcing part 9 Gap Dover 10 Magnetic head core bar 11 Adhesive side

Claims (3)

[Claims] 1. A floating magnetic head in which a magnetic head core is bonded to one side of a slider, and a back gap portion of the magnetic head core is bonded to the slider. 2. The floating magnetic head according to claim 1, wherein a front gap portion of the magnetic head core is bonded to the slider. 3. A method of manufacturing a floating magnetic head having a magnetic head core adhered to one side of a slider, wherein an adhesive glass layer adheres the magnetic head core to one side of a slider bar on which a flying rail is formed. Adhesive glass layer forming step of forming, a slider bar cutting step of cutting the slider bar on which the adhesive glass layer is formed to form a slider, and a back gap of the magnetic head core on the slider obtained in the step Portion or a gap reinforcing portion forming step of forming a gap reinforcing portion that reinforces both the back gap portion and the front gap portion, and bonding the magnetic head core to the bonding glass layer surface of the slider in which the gap reinforcing portion is formed. And a magnetic head core adhering step for manufacturing a floating magnetic head. Law.