JP3057918B2 - Magnetic head and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head and a method of manufacturing the same, and more particularly, to a magnetic head mounted on a hard disk drive and a method of manufacturing the same.

[0002]

2. Description of the Related Art Hard disk drives are generally known as storage devices for computers, word processors and the like. FIG. 15 shows the structure of a magnetic head conventionally mounted on this hard disk drive. The magnetic head 1 shown in FIG. 1 is called a monolithic type.

In FIG. 1, reference numeral 2 denotes a yoke, and reference numeral 3 denotes a slider for floating the magnetic head from the disk surface. The slider 3 also functions as a core of the magnetic head. Therefore,
The yoke 2 and the slider 3 are both magnetic materials (such as ferrite)
It consists of.

The slider 3 has air bearing surfaces 4 and 5 for floating, and an air groove 6 with a rectangular cross section for improving stability during floating.
7 are formed. In addition, each air bearing surface 4,5
Corners and corners 4a-7a of air grooves 6, 7 are missing
Smooth air flow by creating smooth ridges and smooth surfaces
In addition, chamfering has been performed to facilitate the sliding of the magnetic disk . Reference numerals 8 and 9 denote inclined surfaces for guiding the flow of air generated by the rotation of the magnetic disk to the air bearing surfaces 4 and 5 at the time of magnetic recording and reproduction. Reference numeral 2a denotes a center rail which forms a magnetic gap in cooperation with the yoke 2. is there.

FIG. 16 shows a schematic configuration of a hard disk drive 10 on which the magnetic head 1 is mounted. In the figure, reference numeral 11 denotes a case, 12 denotes a magnetic disk, and 13 denotes an actuator. The actuator 13, arm 15 which is journaled rotatably to the shaft 14, the arm 1
5 , a voice coil motor (VCM) 16, which rotationally drives
Spring arm 1 attached to the tip of arm 15
The magnetic head 1 is mounted on a gimbal plate 19 provided at the tip of a spring arm 17.

When the VCM 16 is driven, the arm 1
Numeral 5 rotates about the shaft 14 in the directions of arrows A1 and A2 in the figure, and the magnetic head 1 moves accordingly. Therefore, the magnetic head 1 is configured to be positioned on a predetermined track formed on the magnetic disk 12.

When the magnetic disk 12 is rotated by the spindle motor 18, the magnetic disk 12
Above, an air flow is generated in the circumferential direction. The air bearing surfaces 4 and 5 are formed on the magnetic head 1 as described above, and the air flow enters between the magnetic head 1 and the magnetic disk 12 by the air bearing surfaces 4 and 5. The magnetic head 1 flies, and the magnetic recording / reproducing process is performed in this flying state.

[0008]

However, in the magnetic head 1 having the above-mentioned conventional structure, the total length in the longitudinal direction (indicated by an arrow a in the figure) of the yoke 2 and the slider 3 is 3.430 mm, and the width of the yoke 2 is large. (Indicated by an arrow b in the figure) had a relatively large shape of 2.230 mm, and the weight was therefore as heavy as about 20 mg. Therefore, there are various problems as described below due to the structure of the magnetic head 1.
Since the size of the slider 3 is large, the material cost increases, and the product cost increases. The magnetic head 1 is a magnetic disk 1
When the slider 3 is moved to the A1 direction limit position and the A2 direction limit position in FIG. 16 above, the slider 3 has a large shape so that the recording / reproducing process cannot be performed at each direction limit position of the magnetic disk 12. Exist widely, and the utilization efficiency of the magnetic disk 12 is reduced. Because the shape of the slider 3 was large, (the faster the periphery) the inner peripheral side of the peripheral velocity of the (A1 direction side) and the outer peripheral side (A2 direction side) the magnetic disk 12 are different in magnetic disk 12 for this speed The floating force generated on each of the air bearing surfaces 4 and 5 due to the difference is different, and hinders the stable floating of the magnetic head 1. Further, the magnetic head 1 is arranged on the gimbal plate 19.
If there is a roll direction angle mounting error when installing
In this case, rolls caused by the
Unable to ascend. As the shape of the slider 3 is large, the area of the air bearing surfaces 4 and 5 is also large, and a large levitation force is generated. To stably fly the magnetic head 1 having such wide air bearing surfaces 4 and 5, it is necessary to considerably increase the spring pressure of the spring arm 17. However, when the spring pressure of the spring arm 17 is increased, the stability at the time of flying is improved, but the magnetic head 1 is magnetized by the large spring pressure of the spring arm 17 when the apparatus 10 stops and when the contact starts and stops. It is strongly pressed against the disk 12. As a result, the magnetic head 1 is attracted to the magnetic disk 12 by being pressed by the spring arm 17 at the time of the stop, and is attracted by the frictional resistance when the magnetic disk is started.
The magnetic head 1 may be damaged when the magnetic disk 12 starts rotating. Furthermore, in order for the spring arm 17 to have a structure having a large spring pressure, the size of the spring arm 17 must be increased, which hinders miniaturization of the device 10 and increases the cost. By the weight of the slider 3 is heavy, fast moving because inertia force increases when moving the magnetic head 1 in VCM16 Ri is difficult and Do <br/>, acceleration or the like from the surface deflection and external magnetic disks 12 It is difficult to secure a stable flying height of the slider 3 corresponding to the above (ie, the followability of the disk is poor).

As described above, the conventional magnetic head 1 has various problems due to the structure of the slider 3. On the other hand, the conventional magnetic head 1 also has the following problems in its manufacturing method. In the conventional magnetic head 1, first, air grooves 6, 7 having a rectangular cross section are formed,
Thereafter, the chamfering is performed on the air bearing surfaces 4, 5 and the corners 6a to 9a of the air grooves 6, 7, which complicates the manufacturing process (this will be described in detail later). Although the air bearing surfaces 4 and 5 are required to have high flatness with high precision, the area of the air bearing surfaces 4 and 5 becomes large due to the large shape of the slider 3, and the air bearing having such a large area It is difficult to flatten the surfaces 4 and 5 with high precision.

The present invention has been made in view of the above points, and has as its object to provide a magnetic head and a method of manufacturing the same, which can reduce the cost, stabilize the flying characteristics, simplify the manufacturing process, and the like. I do.

[0011]

According to the present invention, there is provided a magnetic head having at least a portion formed of a magnetic material and an air bearing surface for floating. A slider, and a yoke made of a magnetic material and abutting against the magnetic material-provided portion of the slider to form a magnetic gap. When the length in the width direction is B, the length A
The ratio (B / A) of the length B to B is set to 0.5 to 0.2, and a pair of V-shaped grooves are formed on the slider with the magnetic gap interposed therebetween for stabilization during flying. Is what you do.

In the method for manufacturing a magnetic head,
After forming a magnetic gap by joining a slider formed at least in part of a magnetic material and having an air bearing surface for floating to a yoke made of a magnetic material, the magnetic gap forming position is changed. The width of the magnetic gap is set to a predetermined track width by forming a pair of V-shaped grooves so as to sandwich the air bearing surface at the same time.
It is characterized by a width .

[0013]

The ratio (B / A) of the length B to the length A when the length in the longitudinal direction of the slider and the yoke combined is A and the length in the width direction of the slider is B is 0.5 to 0.2. By setting the width, the width of the slider, that is, the width of the slider, is reduced with respect to the entire length in the longitudinal direction of the magnetic head. Also, as is well known, the total length A in the longitudinal direction of the flying magnetic head is a predetermined length (in this example, from the point of reducing pitching (swaying in the direction indicated by the arrow in FIG. 17) during flying.
It is desirable to keep it at about 0.2 mm). Therefore, with the above configuration, the shape of the magnetic head is reduced.

As described above, since the width of the slider is reduced and the shape of the magnetic head is reduced, the material cost is reduced and the product cost can be reduced. In addition, since the dead space when the magnetic head reaches the movement limit position on the magnetic disk can be reduced, the use efficiency of the magnetic disk can be improved.

In addition, since the width of the slider is reduced, the occurrence of rolls during flying can be suppressed, and stable flying can be realized. Also, as the weight is reduced,
The reduction of the inertia force reduces the area of the air bearing surface and
It is possible to set the spring pressure of the ring arm small.
Ri, thus prevents the occurrence of damage of the magnetic head in the rotation start of the magnetic disk, and further can reduce the size of the spring arm. In addition, when the weight of the slider is reduced, the inertia force when the magnetic head is moved on the magnetic disk is reduced, so that a stable flying operation of the slider can be secured.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and 2 show a magnetic head 20 according to an embodiment of the present invention. The magnetic head 20 shown in each figure is mounted on a hard disk drive, and slightly flies above the disk surface during recording and reproduction due to rotation of the magnetic disk, and performs recording and reproduction processing in this state. This magnetic head 20 is generally composed of a yoke 21 and a slider 22 (note that the magnetic head 20 is a slider).
FIG. 2 shows a magnetic head 20 provided with a coil bobbin 23.
Is shown).

The yoke 21 is made of ferrite, and is formed in a substantially U-shape when viewed from the side by forming a coil winding groove 24. Further, a position facing the magnetic disk on the upper side is formed to have a predetermined track width (in each drawing, indicated by an arrow D) by groove processing described later.

On the other hand, the slider 22 is formed of ferrite similarly to the yoke 21, and the air bearing surfaces 25, 2 so that the magnetic head 20 floats on the magnetic disk.
6 and the air bearing surfaces 25, 2
6, a V-shaped groove 27, 2 having a V-shaped cross section for stabilizing the magnetic head 20 by allowing air to flow during floating.
8 are formed. In addition, a center rail 29 is formed integrally with the yoke 21 at a center position of the slider 22. The center rail 29 is also formed at the same time by processing a pair of V-shaped grooves 27 and 28 as described later. Reference numerals 30 and 31 denote inclined surfaces for guiding the flow of air generated by the rotation of the magnetic disk during the recording / reproducing process to the air bearing surfaces 25 and 26.

The yoke 21 and the slider 2 having the above configuration
2 is a bonding material 32, 33 made of, for example, low-melting glass after a gap material of a non-magnetic material is interposed at a gap forming position.
(Shown in satin) to form the magnetic gap 34 and the magnetic head 20 shown in FIGS.

The magnetic head 20 having the above configuration is characterized by its shape and dimensions. Hereinafter, the shape and dimensions of the magnetic head 20 will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 3 is a diagram showing the shape and size of the magnetic head 20 according to the present invention in comparison with a magnetic head having a conventional configuration. In FIG. 15, (A) shows a conventional monolithic magnetic head, and FIG.
(The same components as those shown in FIG. 15 are denoted by the same reference numerals). FIG. 2B shows a conventional composite type magnetic head 35. The composite type magnetic head 35 includes a magnetic head core 36 functioning as a magnetic head, and a ceramic slider 38 having a mounting groove 37 for mounting the magnetic head core 36. 36 is mounted and fixed with a glass material or the like. Further, (C) shows a magnetic head 20 according to the present invention.

In FIG. 3, each of the magnetic heads 1, 35,
The size of each of the magnetic heads 1, 35, and 20 can be determined by referring to FIG. As can be seen from the figure, the magnetic head 20 according to the present invention
It can be seen that is much smaller than the conventional magnetic heads 1 and 36.

FIG. 4 is a diagram for quantitatively showing that the magnetic head 20 according to the present invention has been reduced in size. Each of the dimensions, the aspect ratio, the area of each part, and the weight indicated by arrows in FIG. They are shown together. As shown in FIG.
When the length in the longitudinal direction of the slider 22 and the slider 22 is A, and the length in the width direction of the slider 22 is B, the magnetic head 20 according to the present invention has a length-width ratio that is the ratio of the length B to the length A. The ratio (B / A) is 0.26, which is a smaller value than the conventional magnetic heads 1, 35 of 0.65 and 0.71.

On the other hand, as is well known, the total length A in the longitudinal direction of the flying magnetic head is determined by pitching during flying (FIG. 2).
(B), a predetermined length (in this example, approximately 3.2 mm) from the point of reducing the fluctuation in the direction indicated by the arrow X.
Is desirable. That is, Then shortened more full length A, the magnetic head by generation of fine pitching is because collide with the magnetic disk. Conversely, the total length A
If the length is more than a predetermined length (about 3.2 mm in this example),
It is necessary to be able to follow the surface
Worse than necessary, easy to crash with disk
It is known to be. Therefore, in the flying magnetic head, the total length A in the longitudinal direction is a predetermined length (in this example,
It is desirable to keep it at about 3.2mm). Therefore, in the conventional magnetic heads 1 and 35 and also in the magnetic head 20 according to the present invention, the total length A in the longitudinal direction is selected to be about 3.2 mm. There is no significant difference between the heads 1 and 35 and the magnetic head 20 according to the present invention.

As described above, although the overall length A in the longitudinal direction is substantially the same, the magnetic head 20 according to the present invention has a smaller aspect ratio (B / A) than the magnetic heads 1 and 35. Therefore, the width B of the slider 22 of the magnetic head 20 according to the present invention is smaller than those of the magnetic heads 1 and 35 of the conventional configuration. Specifically, the width of the conventional magnetic heads 1 and 35 was 2.230 mm and 2.235 mm, whereas the width of the magnetic head 20 according to the present invention was 0.838 mm.
It has been.

As described above, when the width of the slider 22 is reduced, the area of the air bearing surfaces 25 and 26 is also reduced, and the flying force of the magnetic head 20 may be reduced. Therefore, the inventor mounted the magnetic head 20 according to the present invention on a hard disk drive and measured the flying characteristics thereof. The result is shown in FIG.

In the figure, the solid line shows the flying characteristics of the magnetic head 1 (using a monolithic type) of the conventional configuration, and the dashed line shows the flying characteristics of the magnetic head 20 according to the present invention. Is shown. From this experimental result, it can be seen that the magnetic head 20 according to the present invention has a smaller flying height at the same traveling speed than the magnetic head 1 of the conventional configuration, but can achieve stable flying. The flying height is 85 nm at a running speed of 10 m / sec, which realizes sufficient flying characteristics as a magnetic head of a hard disk drive. Also, in the present inventor's experiments, it can achieve a satisfactory flying performance as a magnetic head of a hard disk device,
The above aspect ratio (B / A) was in the range of 0.2 or more. When the aspect ratio (B / A) is less than 0.2, sufficient levitation characteristics cannot be realized. When the aspect ratio (B / A) is less than 0.2, the area of the air bearing surface becomes too small, and the levitation force cannot be obtained. It seems to be due to.

It is conceivable that the mechanical strength of the magnetic head 20 is reduced by reducing the width of the slider 22 as described above, resulting in a reduction in reliability. In particular, in the case of a flying type magnetic head, an air groove must be formed on the surface facing the magnetic disk to stabilize the magnetic head during flying, so that the air bearing surface on this facing surface has a high degree of flatness. However, the mechanical strength required for obtaining the above is a problem. However, in the magnetic head 20 according to the present invention, the above problem is solved by forming the air grooves as V-shaped grooves 27 and 28. This will be described with reference to FIG.

FIG. 6A shows a magnetic head 2 according to the present invention.
FIG. 3 is a left side view of FIG. As shown in the figure, a pair of V-shaped grooves 27 and 28 are formed on the surface of the slider 20 facing the magnetic disk. Now, suppose that in the magnetic disk 20 having a small width dimension as in the present invention,
FIG. 7B shows a case where a rectangular groove 39 having a rectangular cross section is formed in place of the V-shaped grooves 27 and 28, and similarly, the V-shaped grooves 27 and 28 are formed.
(C) respectively shows a case where a U-shaped groove 40 having a U-shaped cross section is formed instead of. The rectangular groove 39 and the U-shaped groove 40
Are generally used as air grooves in conventional magnetic heads.

In the magnetic head 20 constructed as described above, the width B of the slider 22 is reduced, and the shape of the magnetic head 20 is reduced accordingly, so that the amount of ferrite required for forming the magnetic head 20 is reduced. , The material cost can be reduced, and the product cost can be reduced. In addition, since the dead space when the magnetic head 20 reaches the movement limit position on the magnetic disk (the A1 direction limit or the A2 direction limit in FIG. 16) can be reduced, the magnetic recording area of the magnetic disk can be reduced. Can be increased, and the utilization efficiency of the magnetic disk can be improved.

The width of the slider 22 is reduced, and the width of the slider 22 is reduced .
The pitch between air bearings is also smaller, and each air bearing
Difference between the air flows acting on the contact surfaces 25 and 26 (caused by the peripheral speed difference).
2), the roll (see FIG. 2)
(Refer to (C) the swing in the direction indicated by the arrow Y.) is suppressed, and stable levitation can be realized. Further, since the area of the air bearing surfaces 25 and 26 is reduced, the spring pressure of the spring arm 17 can be set small, so that the damage of the magnetic head 20 at the start of rotation of the magnetic disk can be prevented. Thus, the size of the spring arm can be reduced.

On the other hand, as the width of the slider 22 becomes smaller and the magnetic head 20 becomes smaller,
The own weight of 0 is also lighter than before. More specifically, as shown in FIG.
The weight of 0.1 mg or 16.1 mg is reduced to 6.4 mg in the magnetic head 20 according to the present invention. Thus, the inertial force when moving the magnetic head 20 on the magnetic disk is reduced, and the high-speed movement performance and stable flying operation of the slider 22 can be secured.

Subsequently, the magnetic head 20 having the above configuration
A method of manufacturing the device will be described. In the manufacturing process of the magnetic head 20, most processes such as a process of manufacturing the yoke 21 and the slider 22 from the ferrite block and a process of joining the yoke 21 and the slider 22 to form a magnetic gap are conventionally used processes. Therefore, in the following description, the step of forming the V-shaped groove, which is a feature of the present invention, will be described in detail, and the description of the other steps will be omitted.

FIGS. 7 and 8 are views showing the process of forming the V-shaped grooves 27 and 28, which is a feature of the method of the present invention, in comparison with the process of forming the conventional air grooves 6 and 7. FIG. In each figure,
(A) shows the conventional process of forming the air grooves 6 and 7, and (B) shows the V-shaped grooves 27 and 2 according to the method of the present invention.
8 is a forming step. For convenience of description, first, a conventional process of forming the air grooves 6 and 7 will be described with reference to FIGS. 7A and 8A.

In order to form the air grooves 6, 7, first, a work (referred to as a magnetic head before groove processing) is mounted on a first processing apparatus (first step). Subsequently, groove processing of the air groove 6 is performed (second step. In FIG. 7, a portion formed by each step is indicated by a two-dot chain line, and a step number is added).
Next, the groove processing of the air groove 7 is performed (third step). Air groove 6,
When the processing of No. 7 is completed, the work is mounted on the second processing device (fourth step).

In the second processing apparatus, the inclined surface of the air groove 7 is formed (fifth step). Then, work 180
And then mounted again on the second processing device (sixth step)
The forming process of the inclined surface of the air groove 6 is performed (seventh step).

When the inclined surface processing is completed, the work is removed from the second processing device and mounted on the third processing device (eighth step). When the work is mounted on the third processing device, the first inclined surface is formed on the center rail 2a (ninth step), and the work is turned 180 degrees (tenth step). Is performed on the second inclined surface (step 11).

When the processing of the first and second inclined surfaces is completed as described above, the work is mounted on the fourth processing device (first work).
2), mirror polishing is performed on the first inclined surface formed on the center rail 2a (13th step). Subsequently, the work is turned 180 degrees and mounted again on the fourth processing device (the fourteenth process), and the second inclined surface formed on the center rail 2a is subjected to mirror polishing (first process).
5 steps).

As described above, the conventional method for forming the air grooves 6 and 7 requires fifteen steps before forming the grooves, which complicates the manufacturing process, deteriorates the manufacturing efficiency and the processing accuracy, and is also caused by this. As a result, there is a problem that the product cost increases. Furthermore, four processing devices are required to form the air grooves 6 and 7, and it is necessary to mount and remove a work on each processing device, which also deteriorates manufacturing efficiency and increases product cost. Will occur.

Next, the V-shaped groove 2 which is a feature of the method of the present invention.
7 (B) and 8 (B) for the steps of forming 7, 28
This will be described with reference to FIG.

In order to form the V-shaped grooves 27 and 28, first, a work is mounted on a first processing device (first step). Subsequently, groove processing of the V-shaped groove 27 is performed (second step), whereby the inclined surface near the air bearing surface 25 and the first inclined surface of the center rail 29 are simultaneously processed. When the machining of the V-shaped groove 27 is completed, the machining of the V-shaped groove 28 is performed while the work is maintained in the first machining apparatus (third step). By the groove processing of the V-shaped groove 28, the inclined surface near the air bearing surface 26 and the second inclined surface of the center rail 29 are simultaneously processed.

According to the method of the present invention, the V-shaped grooves 27 and 28 functioning as air grooves are formed by the above three steps, and the track width near the magnetic gap 34 is also regulated to a predetermined width D. That is, according to the present invention, the V-shaped grooves 27 and 28 which function not only as air grooves but also as track width regulating grooves can be formed in only three steps.

As described above, according to the method of the present invention, the number of groove machining steps, which conventionally required 15 steps, can be greatly reduced to three steps, thereby improving the manufacturing efficiency of the magnetic head 20 and improving the product quality. Cost reduction can be realized. In addition, according to the method of the present invention, since the groove processing of the V-shaped grooves 27 and 28 can be performed by one processing apparatus, the work of mounting the processing apparatus on the work only needs to be performed once. Therefore, the occurrence of mounting errors and positioning errors that may occur during mounting can be suppressed, and highly accurate groove processing can be performed. In addition, since only one processing device is required and each V-shaped groove 27, 28 has the same configuration, a tool ( diamond) used for groove processing is used.
Mondo wheel ) can be the same, so that the securing and management of the processing apparatus and tools can be facilitated.

Further, as can be seen from the value of the groove cross-sectional area in FIG. 4, the cross-sectional area of each of the V-shaped grooves 27 and 28 is 0.020 mm ^2, which is provided in the conventional magnetic heads 1 and 35. Because it is smaller than the cross-sectional area of the air groove (0.176 mm ² , 0.106 mm ² )
Cutting (1) that only scans the tool once on the work
Each V-shaped groove 27, 28 can be formed only by the pass. Therefore, this can also improve the manufacturing efficiency.

The V-shaped grooves 27, 28 formed as described above
The slider 22 functions as a negative pressure slider in addition to functioning as an air groove for stabilizing the magnetic head when flying as described above and a track width regulating groove for setting the magnetic gap 34 to a predetermined track width. It also has functions. Hereinafter, this will be described.

As described with reference to FIG. 16, the hard disk drive 10 has an arm 15 on which a magnetic head is mounted.
Is rotated about the shaft 14 in the directions indicated by arrows A1 and A2 in the figure to position the magnetic head on a predetermined track on the magnetic disk.
Therefore, the magnetic head 20 may not always face the direction along the flow of air generated by the rotation of the magnetic disk 12, but may face the direction obliquely to this direction. That is, as shown in FIG. 9, the direction of air flow (indicated by an arrow F in FIG. 9) may be different from the direction in which the V-shaped grooves 27 and 28 formed in the magnetic head 20 extend.

As described above, when air flows in a direction different from the extending direction of the V-shaped grooves 27 and 28, air flowing by rotation of the magnetic disk 12 as shown in FIG. ), The air existing in the V-shaped grooves 27 and 28 is sucked out (the sucked-out air is indicated by reference numerals 41 and 42 in the figure), and a negative pressure is generated in the V-shaped grooves 27 and 28. I do. That is, the slider 22 provided with the V-shaped grooves 27 and 28 functions as a negative pressure slider.

The negative pressure generated as described above is applied to the magnetic head 2
0 acts as a force to attract the magnetic disk 12. Therefore, the floating amount of the magnetic head 20 is controlled to be low, stable flying characteristics can be obtained, and magnetic recording / reproducing characteristics can be stabilized.

In the above-described embodiment, an example has been shown in which the V-shaped grooves 27 and 28 are formed in parallel and all over the same shape and at the same depth. However, the values of the negative pressure and the levitation force generated by changing the groove shape change. Therefore, the magnetic head 20 can be more stabilized during flying by controlling the negative pressure and the floating force generated by appropriately selecting the groove shapes of the V-shaped grooves 27 and 28.

FIGS. 11 to 13 show examples in which the shape of the V-shaped grooves 27 and 28 is changed. FIG. 11 is characterized in that the V-shaped grooves 27a and 28a are formed non-parallel with the same depth and the same shape. In FIG. 12, V-shaped grooves 27b and 28b are arranged in parallel and formed so that the depth becomes deeper as it approaches the magnetic gap 34b. FIG. 13 shows V-shaped grooves 27c and 28.
c are arranged in parallel and the depth is formed so that the magnetic gap 34c side becomes deeper at a predetermined position.

By adopting the configuration shown in each figure, the flying height at the positions where the magnetic gaps 34a to 34c are formed can be improved .
Ri is stably controlled, thus the magnetic Gyatsupu 34a~34c
The magnetic recording / reproducing characteristics can be improved because the distance between the disk and the magnetic disk can be more stably approached. In addition, since the flying characteristics can be adjusted, the flying characteristics can be easily designed at the time of designing.

FIG. 14 shows a magnetic head 50 which is a modification of the magnetic head 20 shown in FIG. In the figure, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The magnetic head 50 shown in FIG.
1 is composed of two slider portions 51a and 51b, and a non-magnetic layer 52 is provided between the slider portions 51a and 51b.
Is provided. Thus, by providing the nonmagnetic layer 52 in the slider 51, the slider portion 51a and the slider portion 51b are magnetically separated. Therefore, the inductance with respect to the outputs of the slider portion 51b and the yoke 21 actually functioning as a magnetic head is obtained.
Since the ratio of the conductance can be set to a low value, the magnetic recording / reproducing characteristics in a high frequency region can be improved and high density recording can be performed. In addition, by appropriately controlling the width of the nonmagnetic layer 52, the inductance with respect to the output can be reduced.
It is also possible to adjust the ratio of.

[0054]

As described above, according to the present invention, the width of the slider is reduced and the shape of the magnetic head is reduced accordingly, so that the material cost can be reduced and the product cost can be reduced. In addition, since the dead space when the magnetic head reaches the movement limit position on the magnetic disk can be reduced, the use efficiency of the magnetic disk can be improved.

In addition, since the width of the slider is reduced, the occurrence of rolls during flying can be suppressed, and stable flying can be realized. Also, since the area of the air bearing surface is reduced, the spring pressure of the spring arm can be set small, thereby preventing the magnetic head from being damaged at the start of rotation of the magnetic disk, and further reducing the size of the spring arm. Can be achieved. Additionally, by weight of the slider becomes lighter, inertial force when moving the magnetic head over the magnetic disk is reduced, it is faster positioning of the magnetic head, de
A stable disk that is not affected by disk runout or external collision
The disk followability is obtained, so that a stable flying operation of the slider can be secured.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a magnetic head according to an embodiment of the present invention,
It is a front view and a right side view.

FIG. 3 is a diagram for comparing the magnetic head shown in FIG. 1 with a conventional magnetic head.

FIG. 4 is a diagram for comparing the magnetic head shown in FIG. 1 with a conventional magnetic head.

5 is a diagram showing flying characteristics of the magnetic head shown in FIG. 1 in comparison with a conventional magnetic head.

FIG. 6 is a diagram for explaining mechanical strength of the magnetic head shown in FIG. 1 while comparing it with a conventional magnetic head.

FIG. 7 is a diagram illustrating a method for manufacturing a magnetic head according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a method for manufacturing a magnetic head according to an embodiment of the present invention.

FIG. 9 is a view for explaining a negative pressure slider.

FIG. 10 is a diagram for explaining a negative pressure slider.

FIG. 11 is a view showing a modified example of a V-shaped groove.

FIG. 12 is a view showing a modified example of a V-shaped groove.

FIG. 13 is a view showing a modified example of a V-shaped groove.

FIG. 14 is a view showing a modification of the magnetic head shown in FIG. 1;

FIG. 15 is a diagram showing an example of a conventional magnetic head.

FIG. 16 is a diagram showing a hard disk device.

FIG. 17 is a diagram for explaining pitching of the magnetic head.

[Explanation of symbols]

 20, 50 Magnetic head 21 Yoke 22, 51 Slider 51a, 51b Slider part 25, 26 Air bearing surface 27, 28 V-shaped groove 29 Center rail 34 Magnetic gap 52 Nonmagnetic layer

Claims (2)

(57) [Claims] 1. A slider having at least a portion formed of a magnetic material and having an air bearing surface for floating, and a magnetic material formed by abutting the magnetic material disposed portion of the slider. And a yoke forming a gap, and the length in the longitudinal direction of the slider and the yoke is A,
When the length in the width direction of the slider is B, the length A
The ratio (B / A) of the length B to the slider (B / A) is set to 0.5 to 0.2, and a pair of V-shaped grooves are formed in the slider with the magnetic gap interposed therebetween for stabilization during flying. Magnetic head. 2. A magnetic gap is formed by joining a slider formed at least in part of a magnetic material and having an air bearing surface for floating to a yoke made of a magnetic material. By forming a pair of V-shaped grooves sandwiching the magnetic gap forming position, the width of the magnetic gap is set to a predetermined track width .
At the same time, the air bearing surface has a predetermined width .