JPH05128425A - Floating type magnetic head and production thereof - Google Patents

Abstract

PURPOSE:To miniaturize the slider body of the floating type magnetic head constituted by embedding a core chip into a slider made of nonmagnetic ceramics and to prevent the deterioration in the flatness of the air bearing surface of the slider. CONSTITUTION:The magnetic gap part of a core chip 4 is embedded into the slider 1 and the winding part 14 of the core chip 4 is positioned on the side outer than the rear end 6 of the slider 1. The winding groove of the slider 1 constituted in such a manner is abolished so that the magnetic head hardly receives the influence of the deformation by lapping load or the expansion and shrinkage of a resin for fixing the core chip. The good flatness is thus maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating head called a composite head in which a core chip is embedded in a non-magnetic slider 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. Regarding magnetic heads.

[0002]

2. Description of the Related Art A conventional flying type magnetic head will be described below.

As shown in FIGS. 8 and 9, a slider 1 made of a non-magnetic ceramic has air bearing surfaces 2A and 2B facing a magnetic disk, and one of the air bearing surfaces 2A and 2B (in the present invention, in the present invention). In the center of 2B),
A slit 3 for burying a core chip is provided in the slider 1 at the air outflow end side, that is, the rear end portion 6, and a core chip 4 processed to have a specified track width is embedded in the slit 3 and welded by a welding glass 5. There is. Further, a winding groove 7 for winding a coil wire is formed in the slider left-right direction on the rear end portion 6 of the slider 1, and a winding (not shown) is formed on the core chip 4 by using this winding groove 7. It

By the way, due to the winding groove 7, the air bearing surface 2A of the rear end portion 6 where the core chip 4 is not welded is in a cantilevered state, so that the air bearing surface is apt to be bent in the final finishing of the air bearing surface by lapping. , Flatness tended to deteriorate.

Further, when the resin 9 is filled and adhered to the bottom surface side of the core burying slit 3 after the core chip 4 is glass-welded, the air bearing surface may be caused by the expansion and contraction of the resin and the core chip 4 depending on the kind and curing condition of the resin. There is a problem that flatness tends to be deteriorated by giving strain to 2A.

In order to solve this problem, as shown in FIG. 10, there is a structure in which a reinforcing portion 13 having an inclined surface 7A is provided in the winding groove 7 to increase the rigidity (for example, US Pat. No. 4,870). , 520).

[0007]

However, in the above-mentioned conventional structure, it takes a long time to process the winding groove 7 having the sloped surface 7a, and the deflection and the deterioration of the flatness are reduced as compared with the conventional example. However, there is a problem that the workability of winding the coil wire in the narrow winding groove 7 is poor.

The present invention solves the above-mentioned problems of the prior art, and provides a flying type magnetic head which does not deteriorate the smoothness of the air bearing surface, has good workability for winding a coil wire, and can be miniaturized. With the goal.

[0009]

In order to achieve this object, in a floating magnetic head of the present invention, a magnetic gap portion of a core chip is buried inside a slider, and a winding portion of the core chip has a rear end of the slider. And a reinforcing winding groove for winding a coil wire having a depth of 0.5 mm or less is provided at the rear end of the slider.

[0010]

With this structure, during finishing by lapping the air bearing surface, deformation due to bending is eliminated, and deterioration of flatness does not occur.

[0011]

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

1 to 5 showing an embodiment of the present invention, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

(Embodiment 1) As shown in FIGS. 1 and 2, a core chip 4 is provided in a slit 3 of an air bearing portion 2B.
Is inserted and fixed by the fused glass 5. That is, in the conventional example, the core chip 4 is the slit 3 of the slider.
However, in the present embodiment, a part of the core chip 4, that is, the I-type core side forming the core chip 4 is embedded. Therefore, the winding portion 14
Is located outside the rear end 6 of the slider 1.

As described above, according to the present embodiment, the magnetic gap portion of the core chip 4 is embedded inside the slider 1, and the winding portion 14 is located outside the slider 1, and the air bearing surfaces 2A and 2B are provided. Since the rear end portion 6 does not have a winding groove, the rear end portion 6 is not easily affected by the lap load or the deformation of the core chip 4 due to the fixing resin, good flatness can be maintained, and the slider 1 can be miniaturized. it can.

Generally, in a monolithic slider in which the main body of the slider 1 and the coil portion are integrally made of ferrite, the width of the coil portion is about 0.2 to 0.6 mm, and the width of the core chip 4 in this embodiment is Also 0.15
By setting the thickness to about 0.3 mm, there is no problem in strength in the winding process.

(Embodiment 2) In the first embodiment, since the core chip 4 is fixed so that the winding portion 14 and the winding hole portion are located outside the slider 1, the fused glass 5
Not covered by In order to completely cover the track portion 8 with the fused glass 5, as shown in FIGS. 3 and 4, the track portion 8 is deeper than the apex portion of the magnetic gap with respect to the bottom surface of the core chip 4 and in the longitudinal direction of the slider 1. Processed to have a slope.

As described above, according to this embodiment, the same effect as that of the first embodiment can be obtained. In processing the track portion 8, the track portion 8 is cut in the state of being cut into the core chips 4.
It is more efficient to process the track portion 8 in the state of the gapped bar 10 before cutting as shown in FIG.

Further, as shown in FIG. 6, in order to protect the track portion 8, after processing the track portion 8, a protective glass 11 is formed.
If the core chip 4 is cut after the track portion 8 is covered with, then embedded in the slider 1 and glass-welded, damage to the track portion 8 can be prevented in the steps from cutting to glass welding.

(Embodiment 3) In the conventional slider 1, the winding groove 7 must be deepened as the slider 1 is lowered for the purpose of downsizing. The dimension of is usually designed to have a depth of around 0.8 mm or more, but in the magnetic head of this embodiment, the winding groove 7
Is none. However, when the size of the slider 1 is limited or when it is desired to increase the number of turns of the coil, as shown in FIG.
Can also be formed.

Table 1 shows the values calculated by the finite element method for the amount of deflection when the groove depth of the auxiliary winding groove 12 is changed.

[0021]

[Table 1]

As is clear from this (Table 1), when the depth of the auxiliary winding groove 12 is set to 0.5 mm or less, the amount of deflection can be greatly improved, and the effect on the flatness can be neglected in practical use. ..

As described above, according to this embodiment, in addition to the same effect as that of the first embodiment, the slider 1 can be downsized and the number of turns of the coil can be increased.

[0024]

As is apparent from the above description of the embodiments, according to the present invention, the magnetic gap portion of the core chip is buried inside the slider, and the winding portion of the core chip is outside the rear end portion of the slider. In addition, since the slider is provided with an auxiliary winding groove for winding a coil wire having a depth of 0.5 mm or less at the rear end of the slider, the smoothness of the air bearing surface is not deteriorated and the coil wire is It is possible to realize an excellent flying type magnetic head which has good workability in winding and can be miniaturized.

[Brief description of drawings]

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

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view of a main part of a flying type magnetic head according to a second embodiment of the present invention.

FIG. 4 is a side view of FIG.

FIG. 5 is a perspective view of a gapped bar when processing a core chip of the floating magnetic head.

FIG. 6 is a perspective view of a gap bar during another processing of the core chip of the floating magnetic head.

FIG. 7 is a perspective view of a main part of a floating magnetic head according to a third embodiment of the present invention.

FIG. 8 is a perspective view of a main part of a conventional floating magnetic head.

9 is a partial front view of FIG.

FIG. 10 is a perspective view of a main part of another conventional flying type magnetic head.

[Explanation of symbols]

 1 Slider 3 Slit 4 Core Chip 5 Welded Glass 6 Rear End 8 Track Part 14 Winding Part

Claims (4)

[Claims] 1. A flying magnetic head in which a core chip made of a magnetic oxide is embedded in a slit of a slider made of non-magnetic ceramics and sealed by a glass material, wherein a magnetic gap portion of the core chip has a magnetic gap portion of the slider. Buried inside,
Further, in the floating magnetic head, the winding portion of the core chip is located outside the rear end portion of the slider. 2. The flying magnetic head according to claim 1, wherein the slider has an auxiliary winding groove having a depth of 0.5 mm or less for winding a coil wire at a rear end thereof. 3. The track height of the core chip is deeper than the front surface of the slider than the apex portion of the magnetic gap, and is inclined in the longitudinal direction of the slider with respect to the front surface of the slider or the bottom surface of the core chip. 1
The flying type magnetic head described. 4. A method of manufacturing a floating magnetic head according to claim 3, wherein track processing is performed in the state of a gapped bar.