JPH09330573A - Flying type magnetic head assembly and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble, with excellent operation efficiency, a flying type magnetic head assembly equipped with a pair of upper and lower flying type magnetic heads which enable setting of the amount of slippage of air outflow ends at a desired value and attainment of a necessary magnetic head performance such as a prescribed reproduction output. SOLUTION: On the occasion of preparing a flying type magnetic head assembly having flying type magnetic heads 10 (10A, 10B) which are equipped respectively with sliders 2 having head cores 1 provided integrally therewith and are disposed oppositely above and below, fitting positions of the upper-side flying type magnetic head 10A and the lower-side flying type magnetic head 10B are regulated relatively so that standardized reproduction outputs of the two flying type magnetic heads 10A and 10B be desired values or below. Thereby the two flying type magnetic heads 10A and 10B are fitted with a prescribed amount of slippage of air outflow ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head assembly composed of a pair of upper and lower magnetic heads used in a magnetic disk device and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 7 and FIG. 8 show a head core 1 which is generally used in a magnetic disk device, and which is made of Fe--Si--.
A monolithic floating magnetic head using a thin film laminated core manufactured by laminating a magnetic thin film made of an Al alloy (sendust), an amorphous magnetic material, iron nitride, etc. on a substrate is shown. In such a flying type magnetic head, the head core 1 has an air bearing surface (Air
Bearing surface "ABS surface" 4), the slider 2 is fixed to the gimbal 200 with an adhesive or the like. The gimbal 200 is attached to a leaf spring support mechanism (suspension) 201 via its tongue portion 200a, and this leaf spring support mechanism 201 is connected to an actuator 202 (FIG. 9) of the apparatus body.

In such a flying type magnetic head, the ABS surface 4 of the slider 2 is arranged so as to face the magnetic recording medium, and the dynamic pressure generated by the traveling of the magnetic recording medium is used to drive the magnetic recording medium up to .0. The structure is such that it floats with a minute gap of 05 μm.

Recently, for example, as a magnetic recording medium for data storage, a flexible disk having a high capacity of 100 Mbyte, for example, "ZIP" manufactured by Iomega Corporation.
100 ”and the like are being used. In a magnetic disk device using such a high capacity flexible disk,
As shown in FIG. 9, a pair of floating magnetic heads 10A and 10B having the same shape and size have, for example, about 3000 rpm.
The flexible disk 100 that rotates in the opposite direction is sandwiched between the upper surface side and the lower surface side of the flexible disk 100. As shown in FIG. 10, a pair of floating magnetic heads 10A and 10B are vertically and accurately arranged to face each other, so that
The gap portion 21 of 0B is the flexible disk 100.
On the other hand, at a predetermined interval (g), for example, as described above, it is possible to float with a minute gap of g = 0.05 μm.

[0005]

However, according to the results of the research and experiment conducted by the present inventor, a pair of upper and lower magnetic heads are vertically symmetrical as shown in FIG. 10 when the floating magnetic head is assembled to the magnetic disk device. It is extremely difficult to dispose them accurately facing each other. Usually, as shown in FIG. 1, in each magnetic head 10A, 10B, the air outflow end 2b of the slider 2 opposite to the air inflow end 2a, that is, the flexible disk 100 is formed. The end portion 2b located on the downstream side in the moving direction of the head core 1 is disposed with a shift of Δ.
In the present specification, this Δ is referred to as the “air outflow end shift amount” of the magnetic head.

To the knowledge of the present inventors, it has not been recognized by those skilled in the art that the amount of deviation of the air outflow end greatly affects the performance of the floating magnetic head assembly having the above-mentioned structure. There wasn't. Therefore, in the conventional flying type magnetic head assembly having the above-described structure, the air outflow end deviation amount (Δ) is about ± 100 μm.

Therefore, the present inventor believes that the air outflow end displacement amount has a great influence on the performance of the flying type magnetic head assembly, and studies and experiments on the relationship between the air outflow end displacement amount and the performance of the flying type magnetic head assembly. And found the following:

That is, the deviation of the air outflow ends 2b of the pair of upper and lower floating magnetic heads 10A and 10B described above is larger than that of the lower magnetic head 10B as shown in FIGS. 1 and 2A. When the magnetic head 10A shifts to the upstream side in the moving direction of the flexible disk 100 (shift in the positive direction)
And as shown in FIG. 2B, the lower magnetic head 10B
On the other hand, there is a case where the upper magnetic head 10A shifts to the downstream side in the moving direction of the flexible disk 100 (shift in the negative direction).

As a result of many research experiments, the present inventor has found that when the pair of magnetic heads 10A and 10B are misaligned in the positive direction, the upper magnetic head 10A of the upper magnetic head 10A is moved as shown in FIG. There is a phenomenon that the flexible disk 100 warps upward toward the air outflow end 10b side of the upper magnetic head 10A as the deviation in the positive direction becomes large, and as a result, the flexible disk in the gap portion 21 of the lower magnetic head 10B. The gap with 100 increases and the reproduction output of the upper magnetic head 10A does not change, as shown in FIG.
The reproduction output of the lower magnetic head 10B is the upper magnetic head 10B.
It was found that as the positive displacement of A increases, it gradually decreases. Similarly, a pair of magnetic heads 10A and 10B
2 has a negative deviation, as shown in FIG. 2B, as the negative deviation of the upper magnetic head 10A increases, the lower magnetic head 10B moves toward the air outflow end 10b side. There is a phenomenon that the flexible disk 100 warps downward, and as a result, the gap portion 21 of the upper magnetic head 10A.
3, the reproduction output of the lower magnetic head 10B does not change, but the reproduction output of the upper magnetic head 10A is largely deviated in the negative direction of the upper magnetic head 10A, as shown in FIG. It was found that it gradually decreased as it became. The present invention has been made based on such novel findings of the present inventor.

Further, as described above, when the pair of magnetic heads vertically opposed to each other in the flying type magnetic head assembly is displaced, reproduction output mismatch between the upper magnetic head and the lower magnetic head. Causes a serious problem for the magnetic disk device. Such a problem occurs not only during reproduction of the magnetic disk device but also during recording.

This problem can be solved by adjusting the air outflow end deviation amount to a desired value when assembling the floating magnetic head assembly, but the air outflow end deviation amount is accurately measured. However, it is extremely difficult to adjust this amount of deviation to a desired value, and work efficiency is extremely poor.

Therefore, an object of the present invention is to provide a pair of upper and lower floating magnetic heads which can set the air outflow end deviation amount to a desired value and can obtain a predetermined reproduction output and other required magnetic head performance. It is an object of the present invention to provide a method for manufacturing a floating magnetic head assembly, which enables the floating magnetic head assembly to be assembled with good work efficiency.

Another object of the present invention is to set the air outflow end deviation amount to a value of 50 μm or less, further 20 μm or less, and to effectively use it as a recording / reproducing magnetic head for a high capacity flexible disk such as 100 Mbytes and 200 Mbytes. It is an object of the present invention to provide a floating magnetic head assembly for a high-capacity flexible disk, which is provided with a pair of upper and lower floating magnetic heads.

[0014]

The above object can be achieved by the flying type magnetic head assembly and the method for manufacturing the same according to the present invention. In summary, the present invention is a method for manufacturing a flying type magnetic head assembly having vertically facing flying magnetic heads provided with sliders integrally provided with head cores, which comprises: A predetermined air outflow of both floating magnetic heads is made by relatively adjusting the mounting positions of both floating magnetic heads so that the standardized reproduction output (dB) of the lower floating magnetic heads is below a desired value. This is a method for manufacturing a flying type magnetic head assembly, which is characterized in that mounting is performed with an amount of edge deviation.

Preferably, the above production method of the present invention is
(A) By relatively moving the upper floating magnetic head and the lower floating magnetic head, the reproduction outputs of both floating magnetic heads due to the deviation in the positive direction or the negative direction are obtained,
(B) Based on the reproduction output obtained in (a) above, the reproduction output at which the air outflow end displacement amount of both floating magnetic heads is zero is set to 0 dB, and the standardized reproduction output (dB) of each magnetic head is set.
Then, the relationship between the standardized reproduction output (dB) of each magnetic head and the air outflow end deviation (μm) is obtained, and then (c)
Based on the relationship obtained in (b) above, the standardized reproduction output (dB) of each magnetic head corresponding to the predetermined air outflow end deviation amount is obtained, and the standardized reproduction of the upper floating magnetic head and the lower floating magnetic head is performed. By setting the output to a predetermined value or less, a predetermined air outflow end deviation is achieved.

According to the above-described manufacturing method of the present invention, there is provided a flying magnetic head assembly in which flying magnetic heads having sliders integrally provided with head cores are vertically opposed to each other. A floating magnetic head assembly for a high-capacity flexible disk, wherein the standardized reproduction output of the side floating magnetic head is within 0.5 dB, and the air outflow end deviation of each floating magnetic head is 50 μm or less. It can be suitably manufactured.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a floating magnetic head assembly and a method of manufacturing the same according to the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 9, the floating magnetic head assembly for a high-capacity flexible disk of the present invention has a pair of floating magnetic heads 10A and 10B facing each other with the flexible disk 100 interposed therebetween. The flexible disk 100 is arranged and configured on the upper surface side and the lower surface side, respectively. The upper floating magnetic head 10A and the lower floating magnetic head 10B have the same shape and size and the same structure. For example, the floating magnetic head having the structure shown in FIG. 4 can be used.

FIG. 4 shows a flying type magnetic head 10 used as the flying type magnetic heads 10A and 10B above and below the flying type magnetic head assembly. As a head core used in a disk device, a magnetic thin film made of an Fe-Si-Al alloy (sendust), an Fe-C-based alloy, an amorphous magnetic material, an iron nitride-based alloy, etc. was laminated on a substrate. This is a monolithic floating magnetic head using a thin film laminated core.

In the present embodiment, the floating magnetic head 10 is
A slider with a head core composed of the head core 1 and the slider 2 is provided. The slider 2 includes a dummy plate 2A and a housing 2B.

To further explain, in the head core 1, a gap portion 21 in which the core halves 1A and 1B each having a pair of magnetic films 14 are used as a gap material or a bonding glass layer m, etc.
It is formed by joining through. At this time, the core half 1
The magnetic films 14 of A and 1B are aligned. The dummy plate 2A is bonded to one side surface of the head core 1 which is parallel to the magnetic film 14. In this example, the core half 1
A is a so-called C core, and the core half body 1B is an I core and has an asymmetric shape, but the shape is not limited to this, and a symmetrical shape is also possible.

Further, one end of the bonded body of the head core 1 and the dummy plate 2A, which is orthogonal to the magnetic film 14, is
One side surface of the housing 2B, which is a substantially rectangular parallelepiped, is integrally bonded via the bonding glass layer m to form the slider 10 with a head core. The dummy plate 2A and the housing 2B that form the slider 2 are, for example, C in this embodiment.
It is made of non-magnetic ceramics containing oO-NiO as a main component.

This head core-equipped slider 10 includes air bearing surfaces (ABS surface) 4, 4
Is processed, but the magnetic film 14 and the gap portion 21 are positioned on at least one ABS surface. After that, the head core 1 is wound and fixed to the gimbal 200 with an adhesive or the like as shown in FIGS. 7 and 8. The gimbal 200 is attached to a leaf spring support mechanism (suspension) 201 via the tongue portion 200a, and the leaf spring support mechanism 201 is connected to an actuator 202 (FIG. 9) of the apparatus body.

In the present embodiment, in order to apply the winding to the head core 1, the winding grooves 15 and 52 formed on both sides of the magnetic film 14 in parallel with the magnetic film 14 are orthogonal to the magnetic film 14. Winding groove 4 formed by penetrating the head core 1 in a mode
A winding window is constituted by 2 and the winding 30 is provided by utilizing this winding window.

In this embodiment, the slider 1 with a head core is used.
0 is a substantially rectangular parallelepiped, and its specific dimensions are not limited to this, but one example thereof is a height (H) of 0.43 mm, a width (W) of 1.60 mm, and a length. (L) is set to 2.03 mm.

In the floating magnetic head assembly of the present invention, the upper and lower floating magnetic heads 10A and 10 having the same size and configuration as the floating magnetic head 10 described above.
B are symmetrically arranged so as to sandwich the flexible disk. Then, the both floating magnetic heads 10A, 10B
Are assembled together to form a flying magnetic head assembly. That is, the upper and lower pairs of the floating magnetic heads 10A and 10B have the gap portions 21 facing the surface of the flexible disk 100, and the motions generated by the running of the flexible disk that normally rotates at 3000 rpm. From the flexible disk 100 to 0.05 at the gap portion 21 by using pressure.
The structure is such that it floats with a minute gap of μm.

According to the present invention, in the floating magnetic head assembly having the above-mentioned structure, the upper floating magnetic head 1
0A and the standardized reproduction output (dB) of the lower floating magnetic head 10B is within 0.5 dB, the upper floating magnetic head 10
The deviation in the positive direction and the deviation in the negative direction between A and the lower floating magnetic head 10B are 50 μm or less, preferably 20 μm or less. The standardized reproduction output (dB) will be described in detail later.

To further explain, in FIG. 5, four sets of flying type magnetic head assemblies having the above-mentioned structure are manufactured, and in each flying type magnetic head assembly, an upper flying type magnetic head 10A and a lower flying type magnetic head 10B are formed. A positive direction deviation and a negative direction deviation are forcedly generated between them, and the upper flying type magnetic head 1 at that time
3 is a graph showing the results of measuring the reproduction output of 0A and the lower floating magnetic head 10B.

In any of the assemblies, when the pair of floating magnetic heads 10A and 10B are displaced in the positive direction, the reproduction output of the upper floating magnetic head 10A does not substantially change, but the lower side. The reproduction output of the magnetic head 10B gradually decreases as the deviation in the positive direction increases. on the other hand,
When the magnetic head is deviated in the negative direction, the reproduction output of the lower flying type magnetic head 10B is substantially unchanged, but the reproduction output of the upper flying type magnetic head 10A is greatly deviated in the negative direction. It can be seen that it is gradually decreasing. That is, the position where the reproduction output starts to change in both the flying magnetic heads 10A and 10B due to the deviation in the positive direction or the negative direction is the position where the deviation amount of the air outflow end is zero.

FIG. 6 shows the standardized reproduction output (dB) of each of the floating magnetic heads 10A and 10B, which is obtained on the basis of the data shown in FIG. 5 with the reproduction output at which the air outflow end deviation amount is set to 0 dB. It is the graph plotted against the air outflow end shift amount (μm). From this graph, the standardized reproduction output (dB) of the upper flying type magnetic head 10A and the lower flying type magnetic head 10B is obtained, so that the amount of deviation of the air outflow end of both flying type magnetic heads 10A, 10B is obtained.

That is, according to the present invention, the standardized reproduction output of the upper floating magnetic head 10A and the lower floating magnetic head 10B (instead of accurately measuring the air outflow end displacement and adjusting this displacement). By setting dB) to a predetermined value or less, it is possible to obtain a floating magnetic head assembly having a predetermined air outflow end displacement amount or a displacement amount less than that.

More specifically, in the present invention, (a) for example, the lower floating magnetic head 10B is fixed in a state where the upper floating magnetic head 10A and the lower floating magnetic head 10B are temporarily assembled in the magnetic disk device. Then, by moving the upper floating magnetic head 10A, the reproduction output of both floating magnetic heads due to the deviation in the positive direction or the negative direction as shown in FIG. 5 is obtained, and (b) is obtained in (a) above. By utilizing the reproduction output data, the double-floating magnetic head 10
A standardized reproduction output (dB) of each magnetic head is obtained by setting the reproduction output of A and 10B at which the air outflow end displacement amount is zero as 0 dB, and the standardized reproduction output (dB) of each magnetic head as shown in FIG. And the air outflow end deviation (μm), and then (c) each magnetic head corresponding to a predetermined air outflow end deviation using the graph shown in FIG. 6 obtained in (b) above. (D) The slider 2 is moved to the gimbal 200 by moving the upper flying type magnetic head 10A so that the standardized reproduction output (dB) of the above (d) becomes the predetermined standardized reproduction output (dB) obtained in the above (c). The flying type magnetic head 10 is fixed by fixing the tongue-shaped portion 200a to the suspension 201, or by another method.
By fixing the relative positional relationship of A and 10B,
It is possible to obtain the flying type magnetic head assembly in which the deviation amounts of the air outflow ends of the upper and lower flying type magnetic heads 10A and 10B are equal to or less than a predetermined value. Of course, in the step (a), the upper floating magnetic head 10A is fixed and the lower floating magnetic head 10A is fixed.
B may be moved, and both magnetic heads 10A and 10B
Therefore, in this case, in this step (d), the lower flying type magnetic head 10B may be used instead of the upper flying type magnetic head 10A, or both magnetic heads 1 may be moved.
0A and 10B will be fixed.

For example, the standardized reproduction output of the upper floating magnetic head 10A and the lower floating magnetic head 10B is 0.5.
By setting below dB, the air outflow end shift amount is 1
It is possible to obtain a floating magnetic head assembly having a size of 00 μm or less, and by setting the standardized reproduction output within a range of 0.2 dB, a floating magnetic head assembly having an air outflow end deviation of 20 μm or less can be obtained. Obtainable. The former floating type magnetic head assembly is 100 to 120 Mbyte.
The magnetic disk device using the high-capacity flexible disk of the present invention, and the latter floating magnetic head assembly can be applied to the magnetic disk device using the high-capacity flexible disk of 200 Mbyte, which has a higher capacity. it can.

In each of the above embodiments, the floating magnetic head manufactured according to the present invention is a composite type floating magnetic head. However, the present invention is not limited to this, and the MIG type floating magnetic head is used. Type magnetic head and other types of magnetic heads.

[0035]

As described above, according to the present invention,
The method of manufacturing the flying type magnetic head assembly having the flying type magnetic heads having the slider integrally provided with the head core, which are vertically opposed to each other, is the standardized reproduction output of the upper side flying type magnetic head and the lower side flying type magnetic head. By adjusting the mounting position of at least one of the floating magnetic heads so that (dB) becomes equal to or less than the desired value, both floating magnetic heads are mounted with a predetermined air outflow end displacement amount. Assemble a floating magnetic head assembly with a pair of upper and lower floating magnetic heads that can set the air outflow end deviation to a desired value and obtain a predetermined reproduction output and other required magnetic head performance with good work efficiency. be able to. Further, in the floating magnetic head assembly of the present invention which can be manufactured in this way, the air outflow end deviation amount is set to a value of 50 μm or less, further 20 μm or less, and 100 Mbyte, 20
It can be effectively used as a magnetic head for a high capacity flexible disk such as 0 Mbyte.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a floating magnetic head assembly.

FIG. 2 is a front view showing a part of the flying magnetic head assembly for explaining the deviation of the air outflow end of the flying magnetic head assembly.

FIG. 3 is a graph showing a relationship between an air outflow end deviation and a standardized reproduction output in a floating magnetic head assembly.

FIG. 4 is a perspective view showing an embodiment of a floating magnetic head that can be used in the present invention.

FIG. 5 is a graph showing a relationship between an air outflow end deviation amount and a reproduction output in the flying type magnetic head assembly.

FIG. 6 is a graph showing a relationship between an air outflow end deviation amount and a standardized reproduction output in a floating magnetic head assembly.

FIG. 7 is a perspective view showing an example of a floating magnetic head.

FIG. 8 is a perspective view of the floating magnetic head of FIG. 7 viewed from below.

FIG. 9 is a schematic diagram for explaining the overall configuration of the flying magnetic head assembly of the present invention.

FIG. 10 is a front view for explaining the deviation of the air outflow end of the floating magnetic head assembly.

[Explanation of symbols]

 1 Head Core 2 Slider 4 ABS Surface 10 (10A, 10B) Flying Magnetic Head 21 Gap Part 30 Winding 100 Flexible Disk 200 Gimbal 201 Suspension

Claims (3)

[Claims] 1. A method of manufacturing a flying type magnetic head assembly, comprising a flying type magnetic head comprising sliders integrally provided with head cores, which are vertically opposed to each other, wherein an upper flying type magnetic head and a lower flying type are provided. Of the floating magnetic heads by adjusting the mounting positions of the floating magnetic heads so that the standardized reproduction output (dB) of the floating magnetic heads is below a desired value. A method for manufacturing a flying type magnetic head assembly, characterized in that the magnetic head assembly is attached by. 2. (a) The reproduction output of both the floating magnetic heads is calculated by moving the upper floating magnetic head and the lower floating magnetic head relative to each other by a positive or negative shift. ) Based on the reproduction output obtained in (a) above, the reproduction output at which the air outflow end deviation of both floating magnetic heads is zero is set to 0 dB, and the standardized reproduction output (dB) of each magnetic head is obtained. The relationship between the standardized reproduction output (dB) of each magnetic head and the air outflow end deviation (μm) was obtained,
Next, (c) the standardized reproduction output (dB) of each magnetic head corresponding to the predetermined air outflow end deviation amount is obtained from the relationship obtained in (b) above, and the upper floating magnetic head and the lower floating magnetic head are obtained. 2. The method of manufacturing a floating magnetic head assembly according to claim 1, wherein the standardized reproduction output of the magnetic head is set to a predetermined value or less to obtain a predetermined air outflow end deviation amount. 3. A flying magnetic head assembly in which flying magnetic heads having sliders integrally provided with head cores are vertically opposed to each other, and standardized reproduction of an upper flying magnetic head and a lower flying magnetic head. A floating magnetic head assembly for a high-capacity flexible disk, wherein the output is within 0.5 dB and the air outflow end deviation of each floating magnetic head is 50 μm or less.