JPH0636254A - Floating magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To provide a floating magnetic head where the assembly process of a core chip to a slider is simplified and assembly accuracy is improved. CONSTITUTION:An L-shaped core chip 11 where a projecting part 13 is formed at a lower edge part is used and the upper surface of the projecting part 13 is laid out under a slider bottom surface 15, thus achieving welding with a glass material 7. Therefore, the core chip 11 is supported at a specific position owing to the empty weight of a slider 1 for preventing the positional deviation from occurring on welding and the core chip 11 needs not be tentatively fixed by a leaf spring, thus simplifying the assembly man-hour.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for recording / reproducing on / from a magnetic recording medium in a fixed magnetic disk device used as an external storage device such as an electronic computer, and a manufacturing method thereof. The present invention relates to a floating magnetic head called a composite head in which a core chip is embedded in a magnetic slider and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, along with the development of information equipment, various magnetic heads for recording and reproducing on a magnetic recording medium have been developed. The conventional floating magnetic head will be described below.

FIG. 6 is a perspective view of a conventional flying type magnetic head. In the figure, 1 is a slider made of non-magnetic ceramics, 2a and 2b are a pair of flying rails formed on both ends of the upper surface of the slider 1 facing the magnetic disk, 3 is an air outflow end of the slider 1, and 4 is a slider. A slit 5 for burying a core chip formed on the air outflow end 3 side of 1 and in a direction perpendicular to the levitation rail 2a has a track portion 6 processed to have a predetermined track width and is arranged on the levitation rail 2a side. A core chip made of a magnetic oxide embedded and fixed in the slit 4, 7 is a glass material for welding and fixing the core chip 5 filled in the slit 4, and 8 is formed in the lateral direction of the air outflow end portion 3 of the slider 1. The winding groove 9 is a resin that fills the gap in the slit 4 after the core chip 5 is inserted.

A method of manufacturing the conventional flying type magnetic head having the above structure will be described with reference to the exploded perspective view of FIG. First, one flying rail 2 of the slider 1
The slit 4 is formed in the vertical direction of the central portion in the width direction of a,
Next, after fixing the core chip 5 provided with the track portion 6 in which a predetermined track width is formed in advance in the slit 4 with the leaf spring 10, the core chip 5 is welded and fixed in the slit 4 with the glass material 7. After that, the leaf spring 10 is removed, and the gap is filled with the resin 9 to manufacture.

As another manufacturing method, instead of fixing with the leaf springs 10, there is a method of bonding and fixing the core chip 5 to the gap with an adhesive resin containing ceramics as a main component.

[0006]

However, in the above-described conventional structure and manufacturing method, when the leaf spring 10 is used to fix the core chip 5, the insertion of the core chip 5 and the leaf spring 10 must be done manually. .

Therefore, after welding the glass material 7, it is necessary to fill the gap between the core chip 5 and the slit 4 with resin or the like.
The leaf spring 10 that fixes the core chip 5 must be removed, and at this time, the work of handling the leaf spring 10 is such that the core chip 5 is displaced.
It has been a factor in hindering mechanization and automation of insertion.

When an adhesive resin containing ceramics as a main component is used, the core chip 5 is temporarily fixed to the slider 1 with an instant adhesive or the like, then the adhesive resin is applied, and the adhesive resin is applied before the glass material 7 is welded. It was necessary to cure it, and it was necessary to remove the portion to which the adhesive resin was attached by grinding or the like.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a floating magnetic head with high assembly accuracy and a method for manufacturing the same, by simplifying the glass welding process of the core chip and the slider. To do.

[0010]

In order to achieve this object, the flying magnetic head of the present invention has a core chip provided with a protrusion projecting in a direction orthogonal to the longitudinal direction of the track portion at a lower end portion facing the track portion. The core chip provided is used. In addition, the manufacturing method is such that when the core chip is glass-welded to the slit of the slider, the protrusion of the core chip is placed on the bottom surface of the slider and the core chip is supported upright by the weight of the slider to prevent the core chip from being misaligned. To do.

[0011]

According to this structure, the glass chip can be welded while supporting the core chip by the weight of the slider, so that the leaf spring and the adhesive resin containing ceramics as a main component, which have been conventionally required, are unnecessary. There is no need to remove it, and the work is greatly simplified.

Further, since the protruding portion of the L-shaped or inverted T-shaped core chip is in contact with the slider bottom due to the weight of the slider, the displacement of the core chip in the height direction with respect to the slider bottom becomes small, and the gap depth is reduced. The accuracy can be increased.

[0013]

【Example】

(Embodiment 1) FIG. 1 is a perspective view of a levitation type magnetic head in a first embodiment of the present invention, and FIG. 2 is a side view of a main part thereof before glass welding. 1 and 2, 1 is a slider, 2
a and 2b are a pair of floating rails, 3 is an air outflow end, 4 is a slit, 7 is a glass material, and 8 is a winding groove. These are the same as the conventional example shown in FIG. 6, and the same parts as those in FIG. 6 are denoted by the same reference numerals, and the description thereof will be omitted.

Reference numeral 11 denotes an L-shaped core chip, and 12
Is a track portion formed at the upper end portion thereof, and 13 is a protruding portion formed at the lower end portion thereof. 14 is the protrusion 1
An escape groove having a depth slightly smaller than the above thickness provided by cutting the end portion of the bottom surface of the slider 1 in order to absorb the vertical thickness of the slider 3 is a slider bottom surface at the escape groove 14. A method of manufacturing the flying magnetic head having the above structure will be described below. First, a method of manufacturing the L-shaped core chip 11 will be described with reference to FIG. 3. As shown in the perspective view of the U-shaped block in FIG. 3A, a rectangular parallelepiped block of single crystal Mn—Zn ferrite is used. , U-shaped block 16 with groove processing by grinding
To form. Then, the magnetic gap facing surface 16a is mirror-lapped, and a metal magnetic material thin film 17 having a higher saturation magnetic flux density than the U-shaped block 16 is formed by sputtering.

Next, as shown in the perspective view of the I-shaped block of FIG. 3B, the I-shaped Mn-Zn ferrite of the same material as that of the U-shaped block 16 is used as the constituent of the other magnetic head core. A step is formed on the magnetic gap facing surface 18a of the block 18 by grinding, and the metal magnetic material thin film 19 is deposited on the step by sputtering. After that, mirror lapping is performed so that the metal magnetic material thin film 19 and the magnetic gap facing surface 18a are flush with each other.

Next, as shown in the perspective view of the core chip block of FIG. 3C, the U-shaped block 16 and the I-shaped block 18 are bonded together by the bonding glass material 20 to form the core chip block 21. . Then, the core chip block 21 is processed into grooves 22 and cut into individual pieces to cut out an L-shaped core chip base material 23, and the track portion 12 is processed by grinding to manufacture the core chip 11.

Next, a method of assembling the slider 1 and the core chip 11 will be described with reference to FIG. First, the core chip 11 is inserted into the slit 4 of the slider 1 so that the air outflow end portion 3 and the core chip 11 are flush with each other.
In addition, one side surface of the core chip 11 and the side surface of the slit 4 are in contact with each other, and the upper surface of the protrusion 13 and the slider bottom surface 15 are in contact with each other. Then, the rod-shaped glass material 7 is placed on the upper surface of the slit 4 and heated, and the slider 1 and the core chip 11 are glass-welded. At this time, the core chip 1
Since the slider 1 is held upright by the slider bottom surface 15 by its own weight and is fixed upright without being tilted, the position of the slider 1 does not shift when the glass is welded.

During glass welding, the weight of the slider 1 and the glass material 7 is applied to the protrusion 13 of the core chip 11, and the core chip 11 is pulled up to the upper portion of the slit 4 by the surface tension of the molten glass material 7. Since force is applied, the upper surface of the protrusion 13 and the slider bottom surface 1
There is almost no occurrence of so-called core chip floating, in which there is a gap between the two, and the dimensional accuracy in the height direction is stable.

The same effect can be obtained by positioning the core chip 11 and the slider 1 in advance with a jig, temporarily fixing the surface where the slit 4 and the core chip 11 are in contact with each other with an instant adhesive agent, and then performing glass welding. .

(Embodiment 2) FIG. 4 is a side view of a main portion of a floating magnetic head in accordance with a second embodiment of the present invention before welding of Galley. In the figure, the same parts as those shown in FIG. 2 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. The present embodiment is different from the first embodiment in that instead of forming the escape groove 14 of the slider 1 in FIG. 2, an escape groove 25 is provided in a support base 24 for supporting the slider 1 and glass is welded. . However, the depth of the escape groove 25 is made slightly smaller than the thickness of the protruding portion 13 so that the weight of the slider 1 is sufficiently applied to the protruding portion 13.

Also in this configuration, as in the first embodiment, the effect that the core chip 11 can be fixed to the slider 1 easily and accurately can be obtained.

(Embodiment 3) FIG. 5 is a side view of a main portion of a floating magnetic head according to a third embodiment of the present invention before glass welding. In the figure, the same parts as those shown in FIG. 2 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. This embodiment is different from the first embodiment in that an inverted T-shaped core chip 26 is used instead of the L-shaped core chip. In FIG. 5, 27 is a core chip 26.
Track portions 28a and 28b are also projecting portions,
Reference numeral 29 is a relief groove of an enlarged portion of the relief groove 14 to absorb the thickness of the protruding portion 28b.

In this case as well, similar to the first embodiment, the slider 1 and the core chip 26 can be welded and fixed in a simple and accurate manner.

Although Examples 1 to 3 show examples in which the shape of the core chip is L-shaped or inverted T-shaped,
The present invention is not limited to this shape, and may have another shape such as one in which the upper surface of the protruding portion is inclined. However, the L-shaped and T-shaped shapes are easier to process in manufacturing the core chip and the relief grooves of the slider than other shapes, and are more preferable than other shapes.

[0025]

As described above, in the floating magnetic head of the present invention, a leaf spring having a small size is not used for fixing the core chip at the time of glass welding, and the core chip is fixed by the weight of the slider. It is an excellent levitating magnetic head with small gap height variation and high gap depth accuracy.The manufacturing method is greatly simplified, and the mechanization and automation of core chip insertion are possible, resulting in high quality levitating magnetic head. It is possible to realize an excellent method for manufacturing a floating magnetic head that can produce a magnetic head with low cost and high yield.

[Brief description of drawings]

FIG. 1 is a perspective view of a floating magnetic head according to a first embodiment of the present invention.

FIG. 2 is a side view of a main part of the floating magnetic head before the glass is welded.

FIG. 3 (a) is a perspective view of a U-shaped block for producing the same core chip, (b) is a perspective view of an I-shaped block for producing the same core chip, and (c) is a perspective view of an assembly block for producing the same core chip.

FIG. 4 is a side view of a main portion of a floating magnetic head according to a second embodiment of the present invention.

FIG. 5 is a side view of a main portion of a floating magnetic head according to a third embodiment of the present invention.

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

FIG. 7 is an exploded perspective view of the floating magnetic head.

[Explanation of symbols]

 1 Slider 2a, 2b Flying rail 4 Slit 7 Glass material 11,26 Core chip 12,27 Track part 13, 28a, 28b Projection part 15 Slider bottom surface

Claims (4)

[Claims] 1. A slider made of non-magnetic ceramic having a pair of levitation rails on both ends of the upper surface and a slit at one end including one end of the levitation rail, and a track portion inserted into and fixed to the slit. A core chip having a protrusion that protrudes in a direction orthogonal to the longitudinal direction of the track portion at an end portion facing the track portion, and one of the upper surface of the protrusion portion and the bottom surface of the slider is provided. A flying type magnetic head that is placed so as to come into contact with the part. 2. The flying magnetic head according to claim 1, wherein the cross-sectional shape of the core chip, which is perpendicular to the longitudinal direction of the track portion, is L-shaped. 3. The flying magnetic head according to claim 1, wherein the cross-sectional shape of the core chip, which is orthogonal to the longitudinal direction of the track portion, is an inverted T-shape. 4. A core chip is placed in the slit of a slider made of non-magnetic ceramic having a pair of levitation rails at both ends of an upper surface and a slit at an end including one end of the one levitation rail, with its track portion facing upward. When fixing, the core chip having a projecting portion projecting in a direction orthogonal to the longitudinal direction of the track portion at the end portion facing the track portion is used, and the projecting portion is arranged below the bottom surface of the slider. A method of manufacturing a floating magnetic head, comprising fixing the core chip by glass welding while supporting the core chip by the weight of the slider.