JPH0589413A - Floating magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the magnetic gap of correct gap depth by grinding a head core as measuring the ground state of the measuring part of the side part of the magnetic gap at the time of grinding the head core in order to obtain the magnetic gap of the gap depth of a prescribed amount. CONSTITUTION:In a floating magnetic head, plural floating rails 46, 48 are formed at a slider 60, and the head core 50 with the magnetic gap 56 is formed at the rear edge part of, at least, one floating rail 48. Then, the measuring parts 52, 54 whose surface facing a medium is extended beyond the magnetic gap 56 are formed at the side part of the head core 50, and an inclined surface 64 is formed at the side surface facing the medium of the measuring parts 52, 54. Then, the inclined surface 72 facing the opposite side of the surface facing the medium is formed at the rear parts of the measuring parts 52, 54. Since the ground state of the head core 50 can be grasped by measuring the ground state of the measuring parts 52, 54, the magnetic gap 56 of the correct gap depth can be manufactured without breaking the slider 60, and an external induced noise is never picked up, and besides, inductance is never raised unnecessarily.

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 in a hard disk drive device and the like and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a 2-rail metal-in-gap (MIG) head type floating magnetic head. In the floating magnetic head 10, two flying rails 14 and 16 are formed on the medium facing surface side of a slider 12. Further, a substantially U-shaped head core 18 is formed on the rear portion (on the front side in FIG. 5) of the slider 12. A magnetic gap 20 is formed in the head core 18, and the periphery of the magnetic gap 20 is protected by the glass 13.

Generally, in a magnetic head, recording / reproduction of magnetic recording is performed by a magnetic gap, so the depth of the magnetic gap (hereinafter, gap depth: GD) greatly affects the recording / reproducing performance of the magnetic head. Is. Therefore,
During the polishing step in forming the magnetic gap, it is necessary to perform polishing while accurately measuring the gap depth.

[0004]

However, in the floating magnetic head 10 described above, since the peripheral portion of the magnetic gap 20 is covered with the glass 13, the gap depth of the magnetic gap 20 cannot be measured. It was difficult. Therefore, conventionally, in order to measure the gap depth, there has been only means for measuring after breaking the slider 12. For this reason, it was difficult to measure the gap depth at the same time as the slider was polished, and the gap depth could not be processed accurately.

Therefore, the present inventor has previously devised a floating magnetic head and a method of manufacturing the same that solve these problems.
As shown in FIG. 6 and FIG.
The measuring portions 32, 32 are formed on the sides of the head core 30 formed behind the flying rail 24 of the slider 26. It is necessary that the measuring parts 32, 32 are formed at least behind the magnetic gap 28.
Then, at the time of polishing from the medium facing surface side of the head core 30, the head core 30 and the measuring units 32, 32 are simultaneously
In addition, polishing is performed under the same conditions. Since the inclined surfaces 34 are formed on the side surfaces of the measuring units 32, 32, when polishing is performed from the medium facing surface side, the monitors 42, 32 of the measuring units 32, 32 are formed.
42 becomes shorter. Therefore, when the head core 30 is polished from the medium facing surface side, the polishing amount of the head core 30 can be grasped by measuring the lengths of the monitors 42, 42.
That is, the gap depth of the magnetic gap 28 can be adjusted.

However, the floating magnetic head 22
However, in manufacturing, the back gap 29 is also formed outside the original head core 30 due to the provision of the measuring section 32. The back gap 29 is apt to pick up externally induced noise or the like which adversely affects the magnetic head, and unnecessarily increases the inductance.

The present invention has been made in order to solve the above-mentioned problems, and a measuring section is provided on the side of the head core on the side of the magnetic gap, and a slope facing the opposite side of the medium facing surface is provided at the rear of the measuring section. By forming it, the gap depth of the magnetic gap is accurately adjusted without destroying the slider and without picking up externally induced noise.

[0008]

According to another aspect of the present invention, there is provided a floating magnetic head, wherein a slider has a plurality of flying rails.
In a floating magnetic head in which a head core having a magnetic gap is formed at the rear end of at least one levitation rail, a medium facing surface is formed on a side portion of the head core so as to extend rearward of the magnetic gap. In addition, an inclined surface is formed on the medium facing surface side of the side surface of the weighing unit, and an inclined surface facing the opposite side of the medium facing surface is formed at the rear portion of the weighing unit.

A floating magnetic head according to a second aspect of the present invention is the floating magnetic head according to the first aspect, wherein an inclination angle of an inclined surface formed on a side surface of the weighing section is 45 °. Is.

According to a third aspect of the present invention, there is provided a method of manufacturing a floating magnetic head, wherein a slider block is sliced and cut to form a slider having a head core, a flying rail, and a weighing section located on a side of the head core. Characterized in that a slanting surface facing the opposite side to the medium facing surface is formed at the rear part of the measuring section, and the measuring section and the head core are polished from the medium facing surface side under the same condition while measuring the polishing change amount of the measuring section. Is.

[0011]

In the floating magnetic head of the present invention, the measuring portion is provided in the vicinity of the head core having the magnetic gap, that is, on the side portion of the head core at the rear end of the flying rail. At this time, the medium facing surface of the measuring unit is formed at least on the side of the magnetic gap. An inclined surface is formed on the medium facing surface side of the side surface of the weighing unit. A slanting surface facing the opposite side to the medium facing surface is formed at the rear portion of the weighing unit. In this configuration, when the measuring unit is polished from the medium facing surface side, the monitor of the inclined surface of the measuring unit is shortened according to the amount to be polished and scraped. Therefore, if the adjacent head core and the measuring unit are simultaneously polished under the same condition, the polishing amount of the head core can be known from the change of the monitor of the inclined surface of the measuring unit. That is, the polishing state of the head core (gap depth of the magnetic gap) can be grasped from the inclined surface formed on the side surface of the measuring portion. This is because the gap depth can be grasped at the same time as the polishing process, and it is possible to manufacture a floating magnetic head having an accurate gap depth.

Further, since the slope is formed at the rear portion of the measuring section, there is no unnecessary back gap due to the formation of the measuring section. Therefore, externally induced noise is not picked up.

[0013]

EXAMPLE A floating magnetic head of this example is shown in FIGS. The head core is omitted in FIG. As shown in FIG. 1, the floating magnetic head of this embodiment has two parallel flying rails 46 and 4 on the medium facing surface side of the slider 60.
8 is formed. A head core 50 including the magnetic gap 56 is formed at the rear end of the flying rail 48. Further, at the rear end of the levitation rail 48, measuring portions 52 and 54 are formed on the side portion of the head core 50 including the side of the magnetic gap 56. Also, the weighing units 52, 5
4, the levitation rail 4 is provided on the outside in the width direction on the side facing the medium.
Slopes 64, 64 that are continuous with 8 are formed.
As shown in FIG. 1, the inclination angles of the inclined surfaces 64, 64 are as follows.
Let be θ. In this embodiment, the inclination angle θ is set to 45 °.

Further, the rear portions of the measuring portions 52 and 54 are inclined surfaces 72 facing the opposite side to the medium facing surface. The inclination angle between the slope 72 and the perpendicular is α, as shown in FIG. The inclination angle α is preferably 5 ° to 15 °. At this time, it is necessary to eliminate the formation of the back gap due to the provision of the measuring portions 52 and 54 by forming the inclined surface 72 at the rear portion of the measuring portions 52 and 54. The back gap 70 of the head core 50 remains.

Next, the gap depth GD of the magnetic gap 56
A method of manufacturing the floating magnetic head 44, which is performed while measuring the height, will be described. First, as shown in FIG. 4, a slider block 40 is manufactured by joining a flat plate-shaped material block 38 made of Mn—Zn ferrite or the like and a substantially U-shaped head core block 36. This is sequentially sliced to form a plurality of sliders. After further polishing or processing, the head core 50, the levitation rails 46 and 48, and the measuring unit 5
2, 54 are formed.

Further, the rear parts of the measuring parts 52 and 54 are polished and
A slope 72 is formed by cutting. The inclined surface 72 faces the opposite side of the medium facing surface to eliminate the back gap due to the formation of the measuring portions 52 and 54.

Next, the slider 60 is polished from the medium facing surface side to form a magnetic gap 56 having a gap depth GD of a predetermined depth. During the polishing process, the head core 50 having the magnetic gap 56 and the measuring unit 5 on the side thereof are provided.
It is necessary to polish 2, 54 simultaneously under the same conditions.

When the measuring units 52 and 54 are polished from the medium facing surface side, the polishing unit 68 shown in FIG. 2B is ground because the inclined faces 64 are formed on the side surfaces of the measuring units 52 and 54. As a result, the monitor (the length of the inclined surface formed on the side surfaces of the weighing units 52 and 54) 66 becomes shorter. In the magnetic head of this embodiment having the inclination angle θ of 45 °, the depth of the head core 50 to be polished is proportional to the decrease amount of the monitor 66. The decrease amount of the monitor 66 can be measured from the medium facing surface side even during the polishing process.

Thus, the gap depth GD, that is, the monitor 6
While measuring 6, the measuring units 52 and 54 and the head core 50
By polishing, the floating magnetic head 44 having the magnetic gap 56 having a predetermined gap depth GD is manufactured.

According to this method, the gap depth GD of the magnetic gap 56, which has been difficult to measure, can be grasped by the monitor 66 that can be measured from the inclined surface formed on the side surface of the medium facing surface, and the gap depth can be polished. It is possible to measure while processing. Therefore, the floating magnetic head 44 having an accurate gap depth can be manufactured. In particular, the weighing units 52, 5
4 and the head core 50 are provided adjacent to each other, the measurement accuracy during gap depth machining is extremely high.

Further, the slope 7 is provided at the rear of the weighing units 52 and 54.
Since No. 2 is formed, there is no back gap other than the head core 50. Therefore, the weighing units 52, 54
With the provision of, the externally induced noise is not picked up, and the inductance is not unnecessarily increased.

Although the tilt angle θ is set to 45 ° in the present embodiment, the tilt angle θ is not limited to 45 °, and if the tilt angle θ is converted by a trigonometric function or the like, the monitor 6 can be used.
It is easy to obtain the gap depth GD from 6, and the object of the present invention can be achieved.

In this embodiment, the measuring parts 52 and 54 are provided on both sides of the head core 50.
It is also possible to provide the weighing section 52 (54) only on one side of either side.

Furthermore, in this embodiment, the slider 60
Although only one head core is provided in the above, two head cores may be provided in the slider 60 and a measuring portion may be formed on each side of each head core, and the same effect can be obtained.

[0025]

According to the present invention, in a floating magnetic head, a measuring portion is provided on at least a side portion of the head core including a side portion of the magnetic gap, and the head core is ground to obtain a magnetic gap having a predetermined gap depth. At this time, since the polishing state of the head core can be grasped by measuring the polishing state of the measuring section on the side of the magnetic gap, the floating type having a magnetic gap with an accurate gap depth can be obtained without breaking the slider. A magnetic head can be manufactured. In particular,
Since the measuring part, which is a measure of the polishing amount of the head core, is formed very close to the magnetic gap, that is, adjacent to the head core, the gap depth can be adjusted with high accuracy. Further, since the inclined surface facing the opposite side to the medium facing surface is formed at the rear portion of the measuring portion, there is no unnecessary back gap associated with the formation of the measuring portion. Therefore, externally induced noise that adversely affects the magnetic head is not picked up, and the inductance is not increased unnecessarily.

[Brief description of drawings]

FIG. 1 is a perspective view of a floating magnetic head of this embodiment.

2A and 2B are a part of a floating magnetic head of the present embodiment, FIG. 2A is a plan view, and FIG. 2B is an enlarged perspective view of a main part.

FIG. 3 is a side view of a head core portion of the floating magnetic head of this embodiment.

FIG. 4 is a perspective view showing a manufacturing process of the floating magnetic head of the present embodiment.

FIG. 5 is a perspective view of a conventional floating magnetic head.

FIG. 6 (a) is a perspective view of a conventional floating magnetic head, and FIG. 6 (b) is an enlarged perspective view of a weighing unit.

FIG. 7 is a partial plan view of a conventional floating magnetic head.

[Explanation of symbols]

 10, 22, 44 Floating type magnetic head 12, 26, 60 Slider 14, 16, 24, 46, 48 Flying rail 18, 30, 50 Head core 20, 28, 56 Magnetic gap 32, 54, 56 Measuring part 34, 64 Tilt Surface 40 Slider block 42 Monitor 66 Monitor 72 Slope GD Gap depth θ Slope angle

Claims (3)

[Claims] 1. A floating magnetic head in which a slider has a plurality of flying rails, and a head core having a magnetic gap is formed at the rear end of at least one flying rail. In the floating magnetic head, a medium facing surface is provided on a side portion of the head core. To extend rearward of the magnetic gap to form a weighing section, an inclined surface is formed on the side of the weighing section on the medium facing surface side, and a slanting surface facing the opposite side of the medium facing surface is formed on the rear side of the weighing section. Floating type magnetic head characterized by being 2. The floating magnetic head according to claim 1, wherein an inclination angle of an inclined surface formed on a side surface of the weighing unit is 45 °. 3. A slider block is sliced and cut to form a slider having a head core, a flying rail, and a weighing section located on the side of the head core, and the slider is provided on the opposite side of the medium facing surface to the rear of the weighing section. A method for manufacturing a floating magnetic head, characterized in that a slanting surface facing toward the medium is formed, and the measuring portion and the head core are polished from the medium facing surface side under the same conditions while measuring the amount of polishing change of the measuring portion.