JPH03201280A - Magnetic head supporting device - Google Patents

Abstract

PURPOSE:To obtain a stable floating characteristic by deflecting the center point between both rails of a magnetic head from a pressure fulcrum toward the inner rail by a specific extent. CONSTITUTION:A pressure fulcrum 6 of a pressure plate 5 is brought into contact with the center of the upper face of a supporting plate 4 to which a magnetic head 1 is adhered, and the front end side and a part projecting from the magnetic head 1 of the supporting plate 4 are stuck to each other by spot welding 7, and this pressure plate 5 is stuck to a suspension member 8 made of a metallic thin plate so that its front end is projected. The center of the magnetic head 1 in the direction orthogonal to the supporting plate 4 is deflected from the pressure fulcrum 6 of the pressure plate 5 toward an inner rail 2, namely, toward the front end side of a supporting device by an extent L. The magnetic head 1 satisfies formulas I and II with respect to roll R of the difference between extents of floating of inner and outer rails 2 and 3. Thus, the stable floating characteristic is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a magnetic head support device. For details, see the inner rail (parallel to one side of the magnetic head).
A floating magnetic head support device that has a floating rail (located inside the recording medium) and an outer rail (levitating rail located outside the recording medium), and supports the center of the magnetic head in the width direction from a pressurizing fulcrum. The magnetic head is deflected toward the tip side, and a roll R, which is the difference between the flying height of the inner rail and the flying height of the outer rail, is generated on the positive side, thereby stabilizing the electromagnetic conversion characteristics of the magnetic head.

``Prior art'' Conventional magnetic head support devices include those shown in Figures 3 and 4.
It is as shown in the figure.

The magnetic head 101 has an inner rail 102 and an outer rail 103 provided in parallel on an air bearing surface facing a magnetic disk surface. Inner rail 102 and outer rail 102 and outer rail 0≦R≦0.
050 (2) A support plate 104 made of a rectangular thin metal plate is adhered with an adhesive so as to be orthogonal to the rule 103.

On the other hand, a hemispherical pressure fulcrum 106 is bulged out from the lower center of the pressure plate 105, which is a strip-shaped metal thin plate, near the tip.

Support plate 1 with magnetic head 101 adhered as described above
The pressure fulcrum 106 of the pressure plate 105 is brought into contact with the center of the upper surface of the support plate 104, and the end side, which is the left side in the drawing, is fixed to the part of the support plate 104 that protrudes from the magnetic head 101 by spot welding 107. This pressure plate 105 is fixed to a suspension member 108 made of a thin metal plate so that its tip side protrudes. A magnetic core 109 is provided at the end of the outer rail 103.

In the magnetic head support device configured as described above, during magnetic recording and reproduction, the magnetic head 101 is brought into pressure contact with the surface of the magnetic disk, and the magnetic head 101 is driven in a so-called contact start-stop method in which the magnetic head is started and stopped in this state. There is. When the magnetic disk is stationary, the air bearing surface is pressed against the surface of the magnetic disk by the load P.
When the magnetic disk rotates, lift dynamic pressure is generated on the air bearing surface of the magnetic head 101, and this lift dynamic pressure and the load P are balanced and the magnetic head 101 flies. The floating magnetic head 101 makes pitch and roll movements.

When applying a load P to the magnetic head 101, conventionally, the widthwise center of the magnetic head 101 and the pressurizing fulcrum 106 have been aligned.

"Problems to be Solved by the Invention" In the conventional magnetic head support device, by setting the load point at the center of the magnetic head 101, stable flying characteristics were obtained in the region of the flying height of 0.3 μm.

However, if an attempt is made to reduce the spacing loss by setting the flying height to 0.1 μm of the conventional l/, in order to achieve high density magnetic recording, the following problem occurs.

The magnetic head 101 has a low flying height and it is difficult to set the outer rail side to the lowest flying height. The floating height of the rail is larger than the floating height of the inner rail), making it difficult to control a stable flying posture. As a result, the magnetic head 101 may be damaged or the magnetic disk may be damaged. If the magnetic head 101 is repeatedly damaged, the flying attitude will be disturbed, and in the worst case, the magnetic head 101 will crash.

"Means for Solving the Problems" In view of the above circumstances, the present invention provides a magnetic head having a parallel inner rail and an outer rail on one surface, and an inner rail on the other side of the magnetic head, in order to stabilize the flying of the magnetic head. Then, a support plate glued perpendicularly or parallel to the outer rail is brought into contact with a hemispherical pressure support point bulged on the pressure plate, and one end of the support plate is fixed to the pressure plate, and the magnetic head is moved in a pinch motion. In a magnetic head support device supported to allow roll motion, the center points of both rails of the magnetic head are deviated from the pressure fulcrum to the inner rail side, and the widthwise center of the magnetic head and the pressure fulcrum are aligned. When the distance is L (mm) and the roll R (μm) is the difference between the floating height of the inner rail and the floating height of the outer rail,
A magnetic head support device configured to simultaneously satisfy the following formulas (1) and (2): L = 4.505X R+0
．． 010...(1) 0≦R≦0.050
... (2).

"Function" By deviating the center points of both rails of the magnetic head from the pressure fulcrum to the inner rail side, the moment is always larger on the outer rail side than on the inner rail side, and the flying height on the inner rail side is higher than on the outer rail side. is large, the roll R satisfies O≦R≦0.050, and stable flying characteristics are obtained.

When the above-mentioned distance is smaller than the value determined by equation (11, (2)), it becomes difficult to set the flying height of the outer rail to the minimum flying height, and the distance I,
If it is larger than the value determined by equation (2), the recording medium will be damaged by contact start, stop, rail edges, etc.

"Example" The present invention will be described in detail below based on FIGS. 1 and 2.

The embodiment of the present invention differs from the magnetic head support device described as the conventional example in FIGS. 3 and 4 in that the center in the width direction of the magnetic head is shifted toward the inner rail side from the pressure fulcrum of the pressure plate. Other than that, the structure is exactly the same.

That is, the magnetic head 1 has an inner rail 2 and an outer rail 3 provided in parallel on an air bearing surface facing a magnetic disk surface. The inner rail 2 is placed in the center of the surface on the opposite side where the floating surfaces of the inner rail 2 and outer rail 3 are.
Then, a support plate 4 made of a rectangular thin metal plate is bonded with an adhesive so as to be orthogonal to the outer rail 3.

On the other hand, a hemispherical pressure fulcrum 6 is bulged out from the lower center of the pressure plate 5, which is a strip-shaped thin metal plate, near the tip.

The pressure fulcrum 6 of the pressure plate 5 is brought into contact with the center of the upper surface of the support plate 4 to which the magnetic head 1 is adhered as described above, and the tip side, which is the left side in the drawing, and the part of the support plate 4 that protrudes from the magnetic head 1 are connected. It is fixed by spot 7 and welding 7. This pressure plate 5 is fixed to a suspension member 8 made of a thin metal plate so that its tip side protrudes.

A magnetic core 9 including a coil and a bobbin is provided at the end of the outer rail 3.

Here, the center of the magnetic head l in the direction orthogonal to the support plate 4 (width direction of the magnetic head 1) is set a distance from the pressure fulcrum 6 of the pressure plate 5 to the inner rail 2 side, that is, to the tip side of the support device. deviate only.

The width of the magnetic head 1 is 3.2+*m, the circumferential speed of the magnetic disk is 9.38 m/sec, and the distance is 0.050 to 0.
When the roll R, which is the difference between the floating height of the inner rail 2 and the floating height of the outer rail 3, was measured with a height of 15 m, the results shown in FIG. 4 were obtained. Black circles indicate measured values.

The center in the width direction of the magnetic head 1 is deviated by 0.05 to 0.150 towards the inner rail from the pressure fulcrum 6 of the pressure plate 5, and the roll R is on the plus side in both cases and the magnetic head 1 is This shows that the outer rail 3 is floating stably, and as the deflection scale increases, the roll R increases accordingly and the floating amount of the outer rail 3 becomes smaller. Expressing this relationship in a formula, where deviation distance L (m) and roll R (μm), L = 4.505 x R+
It became 0.010.

Therefore, if the magnetic head 1 satisfies the following equation (LL (21), stable flying characteristics can be obtained.

L = 4.505x R+0.010...(
1) 0≦R total 0.050 (2) On the other hand, since a two-component engineered poxy adhesive is used to bond the magnetic head support device to the support plate 4, measuring, mixing, stirring, and removal are required. It requires work such as foaming. Since the time during which the adhesive can be used after mixing the two liquids is short, the adhesive strength varies and it is difficult to automate the adhesive process.

To solve this problem, a small amount of a one-component engineered poxy adhesive containing dicyanamide as a main component is applied, the magnetic head 1 is fixed to a support device, and then heated and cured at 150° C. for 40 minutes.

In the above embodiment, the support device is bonded in a direction perpendicular to the inner rail and the outer rail, but with the magnetic head bonded parallel to the inner rail and outer rail, the widthwise center of the magnetic head is , 0.010 to 0.23 on the inner rail side from the pressure support point
The effect can be obtained even when the distance is deviated by 5 mm.

``Effects of the Invention'' As described above, the present invention provides a support plate having a magnetic head having a parallel inner rail and an outer rail on one side and bonded to the other side so as to be perpendicular to the inner rail and the outer rail. In a magnetic head support device in which pressure is brought into contact with a temporarily bulged hemispherical pressure support point, one end of which is fixed to a pressure plate, and the magnetic head is supported to allow pitch and roll movements, the magnetic The widthwise center of the head is deviated from the pressure fulcrum to the inner rail side, and the distance between the widthwise center of the magnetic head and the pressure fulcrum is set to L.
(n), and roll R (μm) which is the difference between the floating height of the inner rail and the floating height of the outer rail, the following formula (1
), (Magnetic head support device configured to simultaneously satisfy formula 21, L=4°505x R+0.010...(1)
Since O≦R total 0.050 (2), the roll R of the magnetic head is on the positive side, the flying characteristics are stable, there is no damage to the magnetic head or magnetic disk, and the magnetic There are no head crashes. Moreover, the electromagnetic conversion characteristics of the magnetic head are stabilized.

[Brief explanation of drawings]

Fig. 1 is a bottom view of a specific embodiment of the present invention, Fig. 2 is a chart showing the relationship between the deflection scale from the pressure fulcrum of the magnetic head and the roll R, and Fig. 3 is a diagram of a conventional magnetic head support device. Side view,
FIG. 4 is a bottom view of FIG. 3.

Claims (1)

[Claims] (1) A hemispherical shape in which a magnetic head having an inner rail and an outer rail parallel to each other in the longitudinal direction of one side is glued to the other side so as to be perpendicular or parallel to both rails, and a support plate is bulged out from the pressure plate. In a magnetic head support device, the center of the width direction of the magnetic head is fixed to a pressure plate and one end thereof is fixed to a pressure plate, and the widthwise center of the magnetic head is fixed to a pressure plate. The pressure support point is deviated toward the inner rail side, the distance between the center of the width direction of the magnetic head and the pressure support point is L (mm), and the roll R (μ
m), a magnetic head support device configured to simultaneously satisfy the following equations (1) and (2). L=4.505×R+0.010...(1) 0≦R≦0.050...(2)