JPH03152777A - Magnetic head device and magnetic head - Google Patents

Abstract

PURPOSE:To increase a pitch angle and to improve traceability by setting the mass of a magnetic head at an air inflow side less than that at an air outflow side setting the intermediate part of length observing in the running direction of the air as reference, and setting a load point at a side nearer to an air out flow end than the intermediate part of the length observing in the running direction of the air. CONSTITUTION:Since the loading point P2 is set nearer to the air outflow end than the intermediate part P3 of the length in the running direction of the air, the area of an air bearing plane 101 at the air inflow side becomes larger than that of the air bearing plane 101 at the air outflow end side, and dynamical pressure generated at the air inflow side becomes larger than that generated at the air outflow side setting the load point P2 as reference. Furthermore, since the mass at the air inflow side is set less than that at the air outflow side setting the intermediate part P3 of the length observing in the running direction of the air as reference, the difference of the mass between the air inflow end side and the air outflow end side setting a load point P2 as reference can be reduced, and the moment of inertia can be reduced. Thereby, it is pos sible to increase the pitch angle and to improve the traceability.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a floating magnetic head device and a magnetic head, and the present invention relates to a floating magnetic head device and a magnetic head, in which a load point is set on the air outflow end side from the middle part of the length in the air flow direction. At the same time, by making the mass on the air inflow side smaller than the mass on the air outflow side based on the intermediate part, a floating structure with a large pitch angle, good followability, and easy machining that supports high-density recording can be achieved. The present invention is designed to provide a type magnetic head device and a magnetic head.

<Prior art> A magnetic head has a read/write element on the air outflow end side of a slider having an air bearing surface, and a load point is set on the surface opposite to the air bearing surface to allow pitch and roll motion of the slider. A magnetic head device including a head support device for supporting the magnetic head is well known in the past.

FIG. 8 is a diagram showing the principle structure of this type of magnetic head device, in which the air bearing surface 101 of the slider L is brought into pressure contact with the surface of the magnetic disk M, and in this state, starting and stopping are performed.
So-called contact.

Driven by start-stop system. When the magnetic disk M is stationary, the air bearing surface 101 is pressed against the surface of the magnetic disk M by the load F, but when the magnetic disk M rotates, lift dynamic pressure is applied to the air bearing surface 101 of the slider 1. occurs, and it floats with a flying height that balances this dynamic pressure and the load F1. When applying a load F1 to the slider 1, conventionally, the entire length of the slider 1 in the air outflow direction is defined as L, and approximately the center P of L/2 from both sides is
The load point was set at .

Normally, in order to prevent a crash between the magnetic disk M and the magnetic head, the flying height g1 on the air inflow end side is larger than the flying height g2 on the air outflow end side, as shown by the dotted line in FIG. In other words, a flying posture that satisfies g+>g2 is ensured. Therefore, % magnetic head 1 is magnetic disk M
Pitch angle θ determined by flying height g1% g2
It floats to the surface.

<Problems to be Solved by the Invention> However, in a flying magnetic head device, in order to reduce spacing loss and achieve high density magnetic recording, the flying height g+sgx is, for example, 0.1 to 0.2 μ■. The range tends to become smaller and smaller. Therefore, with the conventional pitch angle θ, the flying height g, especially on the air inlet side, becomes small, and the magnetic head strongly contacts or bites into the magnetic disk M due to dust, vibrations of the magnetic disk M or the slider 1, etc. Crashes are more likely to occur.

In order to solve the above-mentioned problems, various proposals have been made in the past.
No. 92978 discloses a technique in which the rail width is widened at the air inflow end and narrowed at the air outflow end to increase the pitch angle and prevent the above-mentioned crash. However, in order to obtain a predetermined rail width shape, advanced physical processing or machining is required, which is difficult to realize in practice.

On the other hand, a simple method may be to move the load point largely toward the air outflow end. However, with respect to the center portion, which is the load point of the slider, the mass on the air inflow side increases and the mass on the air outflow side decreases. Therefore, with respect to the load point, the balance of moments of inertia between the air inflow side and the air outflow side is lost, and the moment of inertia of the entire magnetic head increases. This increase in the moment of inertia deteriorates followability and makes it impossible to meet the high-speed data transfer and processing required in combination with a computer.

In Japanese Patent Publication No. 58-28650, a taper or stepped portion is provided on the air inflow end side of the slider, and the total length of the slider and the length of the tapered surface or stepped portion are determined.

A technique has been disclosed in which the ratio (1,+/1.) is set to 1/10 or less to prevent the front from falling. However, in this prior art, the mass on the air inflow side decreases and the mass on the air outflow side increases with respect to the center portion, which is the load point of the slider. As a result, the moment of inertia of the magnetic head as a whole increases, resulting in poor followability.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a flying magnetic head device and a magnetic head that are compatible with high-density recording and have a large pitch angle and good followability.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a magnetic head having a read/write element on the air outflow end side of a slider having an air bearing surface, and a magnetic head having a read/write element on the side opposite to the air bearing surface. and a head support device that supports the magnetic head so as to set a load point on the slider to allow pitch and roll motions on the slider, the magnetic head being configured to support the magnetic head in the direction of air flow. The mass on the air inflow side is smaller than the mass on the air outflow side with respect to the middle part of the length as seen, and the load point is smaller than the middle part of the length as seen in the air flow direction. It is characterized by being set near the air outflow end.

Since the load point is set closer to the air outflow end than the midpoint in the air flow direction, the area of the air bearing surface on the air inflow side is smaller than the air outflow end with respect to the load point. The area is always larger than the area of the air bearing surface on the side, and the dynamic pressure generated on the air inflow side is greater than the dynamic pressure generated on the air outflow side. This increases the pitch angle.

Moreover, since the mass on the air inflow side is smaller than the mass on the air outflow side based on the middle part of the length seen in the air flow direction, the mass on the air inflow end and the air The mass difference between the outlet end and the outlet end is reduced, and the moment of inertia is reduced. Therefore, followability becomes good.

The present invention is applicable not only to thin-film magnetic heads but also to almost all floating magnetic heads, such as Wenchester-type magnetic heads, composite-type magnetic heads, and MIG-type magnetic heads.

<Example> FIG. 1 is a diagram showing the basic configuration of a magnetic head device according to the present invention. In FIG. 0, the same reference numerals as in FIG. The head is
A volume reduction step in which the volume of the slider 1 is reduced in a region of the surface 103 that is closer to the air inflow side than the intermediate portion P of the length as seen in the air flow direction a and that does not cause any change in the area of the air bearing surface 101. It has a section 104. The volume reduction portion 104 shown in the embodiment is formed as a recess. The reduced volume portion 104 due to the recess can be easily formed by machining. In addition to this, it is also effective to use an inclined surface or a letter of appreciation, and in a magnetic head having rails, a structure in which the recesses between the rails are deep on the air inflow side and shallow on the air outflow side.

With the above structure, the mass on the air inflow side is smaller than the mass on the air outflow side with respect to the intermediate portion P3 of length L as seen in the air flow direction a.

The load point P2 is set at a position as far away as Δ from the middle portion (L/2) toward the air outflow end, where L is the length of the air bearing surface 101 in the air outflow direction. The position of the load point P2 is the intermediate portion P.

Based on this, the optimum position is such that the mass difference caused by making the mass on the air inflow side smaller than the mass on the air outflow side is canceled out.

When the load point P2 is set as described above, the area of the air bearing surface 101 on the air inflow side is always larger than the area of the air bearing surface 101 on the air outflow end with respect to the load point P, and the air The dynamic pressure generated on the inflow side becomes greater than the dynamic pressure generated on the air outflow side. Therefore, the pitch angle θ becomes large.

Since the mass on the air inflow side is smaller than the mass on the air outflow side with respect to the middle part P3 of the length seen in the air flow direction a, the air inflow end side with respect to the load point P2 The mass difference between the air outlet end and the air outflow end side is reduced, and the moment of inertia is reduced.

Therefore, followability becomes good.

FIG. 2 shows a perspective view of a specific embodiment of the magnetic head. The slider 1 is made of, for example, a ceramic structure, and has two rail parts 105 formed at an interval on the surface facing the magnetic disk, and the surface of the rail part 105 is an air bearing surface 101 with a high degree of flatness. A volume reduction portion 104 formed by a recess is provided on the air inflow end side of the surface 103 opposite to the air bearing surface 101 .

On the air bearing surface 101 side, in combination with a magnetic disk, a read/write element 2 is attached to one end that becomes an air outflow end for 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 a process similar to IC manufacturing technology, it may also be used as a read/write element for constructing a Wenchester type magnetic head, a composite type magnetic head, a MIG type magnetic head, etc. good.

FIG. 3 shows a perspective view of yet another embodiment of the magnetic head. In this example, air bearing surface 1
01 has a planar shape without rails. and,
A volume reduction portion 104 formed by an inclined surface is provided on the air inflow end side of the shaft 103 opposite to the air bearing surface 101 .

FIG. 4 shows a perspective view of yet another embodiment of the magnetic head. In this embodiment, the recess 104 between the rails 105-105 is made deeper on the air inflow side and shallower on the air outflow side, thereby being used as a volume reduction section.

FIG. 5 is a plan view of the main parts of the Harun air disk device,
M is a magnetic disk, A is a magnetic head device, and B is a positioning device. The magnetic disk M is rotationally driven in the direction of arrow a by a rotational drive mechanism (not shown). The magnetic head device A is driven and positioned by the positioning device B in the direction of the arrow bl or b2 on the rotational diameter O, thereby performing magnetic recording and reproduction on a predetermined track. The magnetic head device A is composed of a magnetic head having a read/write element 2 attached to a slider 1 and a head support device 3.

FIG. 6 is a front view of the main part of the magnetic head device A, and FIG.
The figure is also a bottom view seen from the air bearing surface side.

However, the structure of the head support device may be arbitrary. The head support device 3 fixes one end of a support body 32 made of an elastic thin metal plate to a rigid arm portion 31 attached to the positioning device B using coupling tools 311 and 312, and also attaches one end of the support body 32 in the longitudinal direction of the support body 32 to a rigid arm portion 31 attached to the positioning device B. The support body 32 has a structure in which a flexible body 33 made of a thin metal plate is attached to a certain free end, and a slider l is attached to the lower surface of this flexible body 33. The part attached to the rigid arm part 31 is elastic. Spring part 32
1, and a rigid beam portion 322 is formed continuously to this elastic spring portion 321. The rigid beam portion 322 has flanges 322a and 322b bent on both sides. The flexible body 33 is aligned with the longitudinal axis 02 of the support body 32.
two outer flexible frame portions 331.33 extending substantially parallel to the
2, a horizontal frame 333 that connects the outer flexible frame parts 331 and 332 at the end remote from the support body 32, and a horizontal frame 333 that connects the outer flexible frame parts 331 and 332 at the end remote from the support body 32, and A central tongue-shaped portion 33 extending from the center and having a free end at the tip.
4, and one end of the horizontal frame 333 on the opposite side from the direction thereof is attached to the vicinity of the free end of the support body 32 by means such as welding.

A loading protrusion 335 having a hemispherical shape, for example, is provided on the upper surface of the central tongue 334 of the flexible body 33, and this loading protrusion 335 allows the support 32 to be moved from the free end of the support body 32 to the central tongue 334. It is designed to transmit the load. Central tongue 33
The surface 103 of the slider 1 is fixed to the lower surface of the slider 4 by means of adhesive or the like.

When bonding the slider l to the lower central portion 334, as shown in FIG.
The slider 1 is arranged so that the loading protrusion 335 is located at a position closer to the air outflow end by Δ than 2,
Fix with adhesive. However, the head support device 3 is not limited to the structure shown in the embodiment, since it is sufficient to allow pitch motion and roll motion with respect to the magnetic head.

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

(a) Since the load point is set closer to the air outflow end than the middle part of the length in the air flow direction, the pitch angle is large, providing a magnetic head device compatible with high-density recording that is less prone to crashes. can.

(b) Since the mass on the air inflow side is smaller than the mass on the air outflow side based on the middle part of the length as seen in the air flow direction, the moment of inertia is small and tracking performance is good. It is possible to provide a magnetic head device and a magnetic head that can handle high-speed data transfer and processing required in combination with a computer.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of a magnetic head device according to the present invention, FIG. 2 is a perspective view of a magnetic head according to the present invention, FIG. 3 is a perspective view of another embodiment, and FIG. 4 Similarly, FIG. 5 is a perspective view of still another embodiment, FIG. 5 is a plan view of the magnetic disk device, FIG. 6 is a front view of the main part of the magnetic head device according to the present invention, and FIG. 7 is also a view from the air bearing surface side. The bottom view of FIG. 8 is a diagram showing the basic structure of a conventional magnetic head device. 1...Slider 2...Read/write element 3...
Head support device 101...Air bearing surface 104...Volume reduction part Fig. 01 Fig.

Claims (2)

[Claims] (1) A magnetic head having a read/write element on the air outflow end side of a slider having an air bearing surface, and a load point set on the surface opposite to the air bearing surface to allow pitch and roll movements of the slider. a head support device for supporting the magnetic head, wherein the magnetic head has a mass on the air inflow side with respect to a mid-length portion as seen in the air flow direction. is smaller than the mass on the air outflow side, and the load point is set closer to the air outflow end than the middle part of the length as seen in the air flow direction. . (2) A magnetic head having a read/write element on the air outflow end side of the slider, which is closer to the air inflow side than the middle part of the length as seen in the air flow direction, and has an area change of the air bearing surface. 1. A magnetic head comprising: a volume reducing portion for reducing the volume of the slider in a region where the slider does not cause the slider.