JP2809451B2 - Magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a floating type magnetic head device combining a magnetic head and a head support device.

<Prior Art> This type of magnetic head device is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-137288.
It is well known in the related art. In this type of magnetic head device, the slider has a structure in which a taper surface is provided on the air inflow side of the air bearing surface provided on the surface facing the magnetic disk, and a read / write element is attached to the air outflow end. I have. The slider is supported by a gimbal head supporting device so as to allow a pitch motion and a roll motion by applying a load to a surface opposite to the air bearing surface.

In magnetic recording / reproduction, the air bearing surface of the slider is pressed against the surface of the magnetic disk, and the start and stop are performed in this state. start. It is driven by a stop method. When the magnetic disk is stationary, the air bearing surface is pressed against the surface of the magnetic disk by the load, but when the magnetic disk rotates, lift dynamic pressure is generated on the air bearing surface of the slider,
It floats with a floating amount that balances this dynamic pressure and load. Conventionally, when a load is applied to the slider, the load point is set at approximately the center of L / 2 from both sides, with the total length of the slider in the air outflow direction.

<Problems to be Solved by the Invention> In the flying magnetic head device, the flying height tends to be further reduced in order to reduce the spacing loss and achieve a higher density of magnetic recording. However, when the flying height is reduced by the above-described configuration of the magnetic head device, the vibration of the magnetic disk or the slider causes the slider to strongly contact or dig into the magnetic disk, thereby causing damage to the magnetic disk or the slider and durability. It has been found that a decrease or the like is caused.

In addition, there has been a problem that the spacing loss between the read / write element and the magnetic disk increases, which is an effect opposite to the reduction of the spacing loss due to the reduction of the flying height.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and to provide a flying magnetic head suitable for high-density recording, which hardly causes a crash with a magnetic disk even when the flying height is reduced. That is.

<Means for Solving the Problems> In order to solve the above-described problems, the magnetic head device according to the present invention employs, as shown in FIG. 1, the air of the slider 1 having the air bearing surface 101 facing the magnetic recording medium M. A magnetic head having a read / write element 2 on the outflow end side, and a load point set on a surface 103 opposite to the air bearing surface 101 so as to allow the slider 1 to perform pitch movement and roll movement.
A head support device 3 for supporting the magnetic head.

The air bearing surface 101 of the slider has a flat shape without a tapered portion on the air inflow end side.

The load point P2 is set closer to the air outflow end than the middle of the length of the air bearing surface 101 in the air outflow direction. The position of the load point P2 is within a range satisfying Δl / L0 ≦ 0.1, where L0 is the length of the air bearing surface 101 in the air outflow direction, and Δl is the distance from the intermediate portion to the load point P2. The advantage of the first air bearing surface 101 having a flat shape having no tapered portion on the air inflow end side is described in, for example, Japanese Patent Application Laid-Open No. 63-201968. According to the present invention, when such a type of slider 1 is used, the load point P2 is set closer to the air outflow end than the middle of the length of the air bearing surface 101 in the air outflow direction. According to this configuration, based on the load point P2, the area of the air bearing surface on the air inflow side is always larger than the area of the air bearing surface on the air outflow end side,
The dynamic pressure generated on the air inflow side becomes larger than the dynamic pressure generated on the air outflow side. As a result, the air inflow end side is lifted upward away from the surface of the magnetic disk M, and the air outflow end side is lowered so as to approach the magnetic disk M in a reactive manner. Less likely to occur.

When the load point P2 deviates from the middle part of the slider of the magnetic head, the balance of the inertia moment on the air inflow side and the air outflow side is broken based on the load point P2, and the inertia moment of the magnetic head as a whole increases. It becomes a tendency. If the moment of inertia is too large, the tracking performance will be poor,
More crashes.

The position of the load point P2 suitable for preventing this adverse effect is as follows: When the length of the air bearing surface 101 in the air outflow direction is L0, and the distance from the intermediate portion to the load point P2 is Δl, Δl / L0 ≦
It is the range that satisfies 0.1. Within this range, it is possible to suppress the deterioration of the followability due to the moment of inertia to a practically negligible level despite the deviation of the load point P2 from the intermediate portion of the slider 1.

The present invention can be applied to almost all floating magnetic heads such as a Winchester type magnetic head, a composite type magnetic head and a MIG type magnetic head as well as a thin film magnetic head.

<Embodiment> FIG. 1 is a view showing a principle configuration of a magnetic head device according to the present invention. An air bearing surface 101 of a slider 1 has a flat shape without a tapered portion on an air inflow end side. .
Assuming that the length of the air bearing surface 101 in the air outflow direction is L0, the load point P2 is set at a position away from the intermediate portion (L0 / 2) by Δl near the air outflow end. Δl is set so that Δl / L0 ≦ 0.1. The slider 1 is mounted on the head support device 3 so as to be at the above-mentioned load point P2.

Next, a specific mounting structure of the magnetic head and the head support device 3 will be described.

FIG. 2 is a plan view of a main part of the magnetic disk drive.
M is a magnetic disk, A is a magnetic head device, and B is a positioning device. The magnetic disk M is driven to rotate in the direction of arrow a by a rotation drive mechanism (not shown). The magnetic head device A is moved by the positioning device B on the rotational diameter O1 by the arrow b1.
Or, it is driven and positioned in the direction of b2, so that the magnetic recording. Reproduction is performed. The magnetic head device A includes a slider 1 and a read / write element 2
And a head support device 3.

FIG. 3 shows a perspective view of the magnetic head. The slider 1 is made of, for example, a ceramic structure, and has two rail portions 105 formed at an interval on a surface facing the magnetic disk, and the surface of the rail portion 105 is an air bearing surface 101 having high flatness. On the air bearing surface 101 side,
In combination with a magnetic disk, the read / write element 2 is attached to one end serving as an air outflow end with respect to an air flow flowing in the direction of arrow a.

Although the read / write element 2 is shown as a thin film element formed according to the same process as the IC manufacturing technology, the read / write element 2 may also be used as a read / write element for forming a Winchester-type magnetic head, a composite-type magnetic head, a MIG-type magnetic head, or the like. Good.

FIG. 4 shows a perspective view of still another embodiment of the magnetic head. In this embodiment, the air bearing surface
101 has a flat shape without a rail.

FIG. 5 is a front view of a main part of the magnetic head device A, and FIG. 6 is a bottom view similarly viewed from the air bearing surface side. The head support device 3 has one end of a support 32 made of a thin elastic metal plate fixed to a rigid arm 31 attached to the positioning device B by means of couplings 311 and 312, and is located at one end in the longitudinal direction of the support 32. A flexible body 33 also made of a thin metal plate is attached to the free end, and the slider 1 is attached to the lower surface of the flexible body 33 (see FIG. 5).
The support 32 has a portion attached to the rigid arm portion 31 as an elastic spring 321, and a rigid beam portion 322 is formed continuously with the elastic spring portion 321. The rigid beam portion 322 has flanges 322a and 322b formed on both sides by bending. The flexible body 33 extends substantially parallel to the longitudinal axis O2 of the support 32.
One outer flexible frame portion 331, 332 and a horizontal frame 333 connecting the outer flexible frame portions 331, 332 at an end remote from the support 32.
And a central tongue-shaped portion 334 extending from a substantially central portion of the horizontal frame 333 to be substantially parallel to the outer flexible frame portions 331 and 332 and having a free end at the distal end. One end on the opposite side to the direction in which there is is attached near the free end of the support 32 by means such as welding (e).

On the upper surface of the central tongue 334 of the flexible body 33, for example, a hemispherical load projection 335 is provided.
35 allows the load to be transmitted from the free end of the support 32 to the central tongue 334. The surface 103 of the slider 1 is fixed to the lower surface of the central tongue 334 by means such as bonding.

As shown in FIG. 6, when the slider 1 is bonded to the central lower portion 334, the air bearing surface 10 has a length in the air outflow direction of the slider 1, that is, from the air outflow end side where the read / write element 2 is located.
The load projections 335 are arranged so as to satisfy Δl / L0 ≦ 0.1 from the substantially central portion L0 / 2 of the length L0 and are adhesively fixed. As a result, on the surface 103 opposite to the air bearing surface 101, the load point P2 is set at a substantially middle portion of the length L0 in the air outflow direction of the slider 1, and the slider 1 receives a load at the load point P2, Pitch and roll movements are performed. The head support device 3 is not limited to the structure shown in the embodiment, as long as it allows the pitch movement and the roll movement of the magnetic head.

Then, with the above configuration, the load point P2 shifts to the air outflow end side, the load on the air inflow side decreases, and the load on the air inflow end side increases. Moreover, the area of the air bearing surface on the air inflow side is larger than the area of the air bearing surface on the air outflow end side with reference to the load point P2, and the dynamic pressure generated on the air inflow side is larger than before.

As a result, even when operated at a low flying height of, for example, 0.2 μm or less, a crash hardly occurs.

<Effects of the Invention> As described above, according to the present invention, it is possible to prevent breakage of the magnetic disk, head crash and spacing loss, and secure stable flying characteristics even when the flying height is reduced. Thus, it is possible to provide a floating magnetic head device suitable for increasing the density of magnetic recording.

[Brief description of the drawings]

FIG. 1 is a diagram showing the principle configuration of a magnetic head device according to the present invention, FIG. 2 is a plan view of a magnetic disk device, FIG. 3 is a perspective view of a magnetic head, and FIG. , FIG. 5 is a front view of a main part of the magnetic head device according to the present invention, and FIG. 6 is a bottom view of the same as viewed from the air bearing surface side. DESCRIPTION OF SYMBOLS 1 ... Slider 2 ... Read / write element 3 ... Head support device 101 ... Air bearing surface

Claims (1)

(57) [Claims] A magnetic head having a read / write element on an air outflow end side of a slider having an air bearing surface facing a magnetic recording medium; and a load point set on a surface opposite to the air bearing surface. A head support device for supporting the magnetic head so as to allow the slider to perform a pitch motion and a roll motion, wherein the air bearing surface of the slider has a tapered portion on an air inflow end side. The load point is set closer to the air outflow end than the middle of the air outflow direction length of the air bearing surface, and the load point is the air outflow length of the air bearing surface. The magnetic head device is set so as to satisfy Δl / L0 ≦ 0.1, where L0 is L0, and the distance from the intermediate portion to the load point is Δl.