JPH03120677A - Magnetic head and magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce a floating quantity and a spacing loss by means of a negative pressure operation generated on a taper surface by providing the taper surface on the air outflow end-side of an air bearing surface in a slider and arranging a read/write element on an air inflow end-side. CONSTITUTION:The air bearing surface 101 of the slider 1 is provided with the taper surface 102 on the air outflow end-side and the read/write element 2 is provided on the air inflow end 105-side. Thus, negative pressure occurs on the taper surface 102 being an air outflow end, the slider 1 is attracted to the direction of a magnetic disk 4 on the air outflow end-side, the floating quantity g is reduced, the spacing loss is reduced and a flight attitude where the air bearing surface 101 becomes almost parallel to the surface of the magnetic disk 4 by the operation of negative pressure is held in magnetic recording and reproduction.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to an air bearing surface (hereinafter referred to as an ABS surface).
Regarding floating magnetic heads and magnetic disk devices that have read/write elements on sliders having It is possible to obtain a magnetic head and a magnetic disk device that ensure stable flying characteristics with respect to the flying height, have small spacing loss, and are capable of high-density recording.

<Prior Art> Traditionally, magnetic disk drives have been equipped with a floating magnetic head that uses the dynamic pressure generated by the running of the magnetic recording medium to fly while maintaining a small air bearing gap between itself and the magnetic recording medium. is used. Such floating type magnetic heads are known, for example, from Japanese Patent Publication No. 57-569, etc., and include winchiesta type magnetic heads in which a υ-shaped core with a coil is attached to a slider made of a magnetic material, and non-magnetic ceramic structure magnetic heads. There are composite magnetic heads in which read/write elements are inserted into the grooves of a slider made of a solid body, and thin film magnetic heads in which thin film elements are formed on the slider according to a process similar to semiconductor manufacturing technology. Also,
Metal, in, gap type (hereinafter referred to as MIG type) type magnetic heads are also known as Winchiesta type magnetic heads.

FIG. 10 is a diagram showing the basic configuration of a conventional magnetic disk device using this type of floating magnetic head, in which 1 is a slider made of a ceramic structure, 2 is a read/write element, and 3 is a gimbal head support. The device 4 is a magnetic disk.

The slider 1 has an ABS surface 101 on the side facing the magnetic recording medium, and in combination with the magnetic disk 4, an end portion on the air inflow side when viewed in the air flow direction a.
It has a structure in which a tapered surface 102 is provided. ABS side 1
01 is usually constituted by two spaced apart rail sections.

The read/write element 2 is arranged on the end side, which is the air outflow side, when viewed in the air flow direction a. Therefore, the read/write element 2 is arranged at the end opposite to the tapered surface 102.

The head support device 3 has an ABS surface 10 with respect to the slider 1.
While applying a load P from the surface 103 side opposite to 1,
Mounted to allow pitch and roll motion.

During magnetic recording and reproduction, the ABS surface 101 of the slider 1 is brought into pressure contact with the surface of the magnetic disk 4 by the spring load P of the head support device 3, and the slider is driven by a contact, start, stop method in which starting and stopping are performed in this state. . When the magnetic disk 4 is stationary, the ABS surface 101 is pressed against the surface of the magnetic disk 4 by the spring load P, but when the magnetic disk 4 rotates, a lifting force is applied to the ABS surface 101 and the tapered surface 102 of the slider 1. Floating height g at which dynamic pressure is generated and this dynamic pressure is balanced by the gimbal spring pressure P
float to the surface.

<Problems to be Solved by the Invention> However, conventional magnetic heads and magnetic disk devices have the following problems.

(B) At a normal flying height (for example, 0.3μ weight), the tapered surface 102 side will float, leading to a front-up floating characteristic.
There was a problem in that the output in the high frequency range decreased.

(b) In order to achieve high-density magnetic recording, the flying height g must be kept as small as possible, for example 0.1 μm or less,
Spacing losses must be reduced. One effective means for reducing the flying height g is the slider 1
The objective is to reduce the lift dynamic pressure by narrowing the area of the floating surface 101 of the aircraft. However, when the area of the air bearing surface 101 is narrowed, the difference in lift dynamic pressure between the air inflow end side where the tapered surface 102 is located and the air outflow end side where the read/write element 2 is located becomes smaller. Therefore, at the front where the tapered surface 102 is located, the load P exceeds the lift dynamic pressure, and the slider 1
As shown by the dotted line in the figure, the front slants downward. When the slider 1 falls forward, the intersection 104 between the air bearing surface 101 and the tapered surface 102 becomes the lowest point, and the vibration of the magnetic disk 4 or the slider 1 causes the intersection 104 to strongly contact the magnetic disk 4. The magnetic disk 4 and the slider 1 may be damaged or their durability may be reduced.

(c) In other words, the front-down state is a trailing state, so the spacing loss between the read/write element 2 and the magnetic disk 4 increases, which is the opposite of the spacing loss reduction due to the lower flying height. turn into.

(d) The increase in compressibility of air due to the decrease in flying height g also causes the slider 1 to fall forward, causing the problems described in (b) and (c) above.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, to provide a magnetic head and a magnetic disk device that have a low flying height, ensure stable flying characteristics, have small spacing loss, and are suitable for high-density recording. It is to provide.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a magnetic head in which a read/write element 2 is provided on a slider 1 having an air bearing surface 101, as shown in FIG. The air bearing surface 101 of the slider 1 has a tapered surface 102 on the air outflow end side, and the read/write element 2 is provided on the air inflow end 105 side.

Effect> The ABS surface 101 of the slider 1 has a tapered surface 102 at the air outflow end when viewed in the air flow direction a, and the read/write element 2 is provided on the air inflow end 104 side.
During magnetic recording and reproduction by a magnetic disk device, a negative pressure is generated on the tapered surface 102 which is the air outflow end, and the slider 1 is moved to the magnetic disk 4 at the air outflow end side where the tapered surface 102 is located.
, the flying height g decreases, and the spacing loss decreases.

In addition, because the slider 1 is attracted toward the magnetic disk 4 on the air outflow end side due to the negative pressure, the forward/upward and forward-down states are avoided, and the ABS surface 101 is approximately aligned with the surface of the magnetic disk 4. A parallel flight attitude is maintained. Furthermore, even when the compressibility of air increases due to a decrease in the flying height, a forward-sloping state can be avoided.

The air inlet end 105 of the slider 1 is formed in an arc shape with an appropriate curvature R in order to avoid getting caught with the magnetic disk 4.

The present invention can be applied to almost all types of flying magnetic heads such as Winkiester type magnetic heads, composite type magnetic heads, thin film magnetic heads, and MlG type magnetic heads, as well as magnetic disk drives and devices using the same. In the following embodiments, a specific example in which the present invention is applied to a thin film magnetic head will be shown as an example.

<Embodiment> FIG. 2 is a perspective view of a magnetic head according to the present invention. The slider 1 has two rail parts 106 formed at an interval on the surface facing the magnetic disk, and a rail part 106.
The surface of No. 6 is an ABS surface 101 with high flatness. A
On the BS surface 101, in combination with a magnetic disk,
A flat or curved tapered surface 102 is provided at one end that is an outflow end for the airflow flowing in the direction of arrow a.

The read/write element 2 has a tapered surface 1 when viewed in the air flow direction a.
02 is located near the air inlet end 105 on the opposite side. The edge of the air inlet end 105 is formed in an arc shape to prevent it from getting caught on the surface of the magnetic disk at the time of contact and start.

The read/write element 2 is a thin film element formed according to a process similar to IC manufacturing technology. FIG. 3 shows an enlarged sectional view thereof. Slider 1 is AhOs-Ti
Insulating film 1b made of ^1205 etc. on substrate 1a made of c etc.
It is coated with The IM write element 2 is formed on the insulating film 1b. 21 is the lower magnetic film, 22 is ^120
8, etc., 23 is an upper magnetic film, 24 is a conductive coil film, 25 is a glabellar insulating film made of organic insulating resin such as novolac resin, and 26 is a protective film made of ^1201 or the like.

The tips of the lower magnetic film 21 and the upper magnetic film 23 are formed into ball portions 211 .
It is 231. Ball part 211.231 is ABS
It is exposed on the surface 101. Reference numerals 212 and 232 denote a yoke portion, which connects the lower magnetic film 21 and the upper magnetic film 23 to each other at the end opposite to the ball portions 211 and 231.

The insulating film 25 is composed of multiple layers of insulating layers M251 to 253, and the yoke portion 21 is formed on the insulating films 251 and 252.
2. As if going around the joint of 232 in a spiral shape,
A conductive coil film 24 is then formed. The protective film 26 is applied to cover the entire read/write element 2 .

FIG. 4 is a perspective view of still another embodiment of the magnetic head according to the present invention. In the embodiment, the ABS surface 1 of the slider 1
01 has a planar shape without a rail part, and has a tapered surface 102 on one end side that is the outflow end for the air flow flowing in the direction of arrow a, and the air flow on the opposite side to the tapered surface 102 is It has a structure in which the read/write element 2 is arranged at the inflow end 105. The edge of the air inflow end 105 is arcuate.

There is one read/write element 2, and it is arranged approximately in the middle in the width direction. The read/write element 2 is composed of a thin film element as shown in FIG. FIG. 5 is an enlarged perspective view of the read/write element portion. The same reference numerals as in FIG. 3 indicate identical components. 27.28 is a lead electrode, 2
9.30 is an extraction electrode.

The lead electrodes 27 and 28 are electrically connected to both ends of the conductor coil membrane 24, and the lead electrodes 29 and 30 are connected to the lead electrode 2f,
28. The extraction electrodes 29 and 30 are led out to opposite end surfaces 107 and 108 of the slider 1 . Concave grooves 109 and 110 passing over the extraction electrodes 29 and 30 are formed on both end surfaces 10 and 108 of the slider 1.
It is provided in strips along its entire length. Further, another groove 111 is provided on the surface 103 of the slider 1.

In the embodiment shown in FIGS. 4 and 5, the read/write element 2
The extraction electrodes 29 and 30 are connected to both end surfaces 107 of the slider 1.
．． 108, the width of the end face to which the read/write element 2 is attached can be reduced to reduce the area and the entire thin film magnetic head can be miniaturized. Further, the side end surfaces 107 and 108 from which the extraction electrodes 29 and 30 are led out serve as cutting surfaces when the thin film magnetic head is cut and taken out from the wafer in the manufacturing process.
30 can be exposed on both end faces 10f, 108.

FIG. 6 is a plan view of a magnetic disk device using a magnetic head according to the present invention, where 3 is a head support device, 4 is a magnetic disk, 5 is a magnetic head according to the present invention, and 6 is a positioning mechanism.

The magnetic disk 4 is rotationally driven in the direction of arrow a by a rotational drive mechanism (not shown). The head support device 3 uses a positioning mechanism 6 to move the magnetic head 5 to a position where the rotational diameter of the magnetic disk 4 is 0. Above, the rotation diameter is 0. It is driven to move linearly in the direction of arrow s or b2 parallel to .

As a result, in a predetermined track, the magnetic disk 4
Writing to and reading from the magnetic disk 4 are performed. The head support device 3 is, for example, manufactured by Japanese Patent Publication No. 58-22
Those known in Japanese Patent No. 827 and the like can also be used.

FIG. 7 shows another embodiment of a magnetic disk device, in which the head support device 3 supports a magnetic disk 4 having a rotational diameter of 0. The magnetic head 5 points on the rotational diameter OI of the magnetic disk 4.

It is driven to move in a curved direction in the direction of .

In the magnetic disk devices shown in FIGS. 6 and 7, the first
As explained in the figure, the magnetic head 5 and the magnetic disk 4 are combined so that the tapered surface 102 is on the air outflow end side and the read/write element 2 is on the air inflow end side. As a result, the effects as explained in FIG. 1 can be obtained.

FIG. 8 is a diagram showing a combination of the magnetic head shown in FIGS. 4 and 5 and the head support device 3, and FIG. 9 is a diagram showing the combination of the magnetic head shown in FIGS.
It is a sectional view on the At line.

The head support device 3 includes a flexible body 31 and a pair of support arms 32.
．． 33. The flexible body 31 is formed into a plate shape using a polymer resin which is an insulating material. As the polymer resin constituting the flexible body 31, a polymer material having mechanical strength capable of withstanding repeated bending and exhibiting appropriate springiness, twisting and elongation, such as polyimide resin, is suitable. A hole 311 is provided at one end of the flexible body 31 in which a magnetic head is placed.

When the flexible body 31 constituting the head support device 3 is made of polymer resin, compared to an elastic metal plate such as stainless steel,
Because the springiness is weak and the degree of freedom in twisting and stretching is high,
4 Even when the magnetic head is downsized to reduce the flying height and increase the density of magnetic recording, it is possible to maintain a stable balance by balancing the lifting dynamic pressure generated in the slider 1 with the springiness of the flexible body 31. Posture control effect can be obtained.

Furthermore, by forming the flexible body 31 with polymer resin,
Processing becomes easier. Moreover, the shape of the flexible body 31 can be adjusted by taking advantage of the high degree of freedom in twisting and stretching of the polymer resin.
The structure can be simplified and processing and assembly can be facilitated.

The support arms 32 and 33 are integrally buried inside the flexible body 31 and are attached to the flexible body 31 such that one end thereof projects within the hole 311 at a distance from each other. . In the embodiment, the support arms 32 , 33 are made of a conductor, and the other ends 321 , 331 are led out to the outside of the flexible body 31 .

In the hole 311, the magnetic head 5 is arranged between the ends of the support arms 32.33, and each of the support arms 32.33 is exposed to the extraction electrode 2 on both side end surfaces of the magnetic head 5.
9.30, each is connected by means of soldering or the like. The pitch and roll movements of the magnetic head 5 are ensured by the support arms 32, 33. The magnetic head 5 has a tapered surface 102 located on the outside, and the read/write element 2
Position the inner side.

When the support arms 32 and 33 are made of a conductor, they can also be used as lead wires for the magnetic head 5, reducing the number of parts.
The overall structure and assembly can be simplified. Further, since the support arms 32 and 33 are positioned within the grooves 109 and 110, the support arms 32 and 33 are positioned in the grooves 109 and 110, so that the support arms 32 and 33 are
2.33 positioning and electrical and mechanical connections become more reliable.

An attachment piece 34 made of a rigid member such as metal is integrally attached to the other end of the flexible body 31 by means of adhesive or the like. The mounting piece 34 has a part that passes over the surface of the flexible body 31,
A loading arm 35 extending above the magnetic head 5 installed in the hole 311 is integrally provided. Load arm piece 35
The distal end portion 351 of the magnetic head 5 is disposed within the groove 111 provided in the surface 103 of the magnetic head 5 and is in spring contact with the magnetic head 5 , and the magnetic head 5 receives a downward load from the arm piece 35 .

The head support device shown in FIGS. 8 and 9 is combined with the magnetic disk 4 in the arrangement shown in FIG.

In the above embodiment, a magnetic head for in-plane recording and reproduction is shown, but the present invention can also be applied to a magnetic head for perpendicular magnetic recording and reproduction. The head support is manufactured by Japanese Patent Publication No. 58-22827.
It is also possible to use those known in Japanese Patent Publication No. 31-93868 and the like.

<Effects of the Invention> As described above, according to the present invention, the following effects can be obtained.

(a) The ABS surface of the slider has a tapered surface on the outflow end side, and the read/write element is arranged on the air inflow end side, so negative pressure occurs on the tapered surface that is the air outflow end. Accordingly, it is possible to provide a magnetic head and a magnetic disk device compatible with high-density recording, which reduce the spacing between the read/write element and the magnetic disk, that is, the flying height, and reduce spacing loss.

(b) Negative pressure generated on the tapered surface prevents the slider from rising or falling forward, maintaining a flight posture in which the ABS surface is approximately parallel to the surface of the magnetic disk, making head crashes less likely and highly durable. Moreover, it is possible to provide a magnetic head and a magnetic disk device with stable flying characteristics.

(C) A magnetic head and magnetic head with excellent durability and flying characteristics, which can avoid the forward-sloping state even when the air compressibility increases due to a decrease in flying height, is suitable for high-density recording with a low flying height, and We can provide disk devices.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of a magnetic head and a magnetic disk device according to the present invention, FIG. 2 is a perspective view of the magnetic head according to the present invention, and FIG. 3 is a diagram showing an embodiment of the magnetic head according to the present invention. FIG. 4 is a perspective view of still another embodiment of the magnetic head according to the present invention; FIG. 5 is an enlarged perspective view of the read/write element portion of the magnetic head shown in FIG. 4;
The figures are a plan view of a magnetic disk device using a magnetic head according to the present invention, FIG. 7 is a plan view of another embodiment, and FIG.
The figure shows a combination of the magnetic head shown in FIGS. 4 and 5 and the head support device 3, and FIG. 9 shows the combination of the magnetic head shown in FIGS.
FIG. 10, a cross-sectional view along a line, is a diagram showing the configuration of a conventional magnetic head and magnetic disk device. 1...Slider 101...ABS surface 102.
...Tapered surface 2...Read/write element 3...Head support device 4...Magnetic disk 5...Magnetic head Fig. 6 Fig. 10

Claims (2)

[Claims] (1) A magnetic head in which a read/write element is provided on a slider having an air bearing surface, wherein the air bearing surface of the slider has a tapered surface on an air outflow end side, and the read/write element has an air bearing surface. A magnetic head characterized in that it is provided on an inflow end side. (2) A magnetic disk device that reads from and writes to a magnetic disk, including a magnetic head having a read/write element on a slider having an air bearing surface, and a head support device that supports the magnetic head, A magnetic disk device, wherein the air bearing surface of the slider has a tapered surface on an air outflow end side, and the read/write element is provided on an air inflow end side.