JPS59207065A - Supporting device of floating head - Google Patents

Abstract

PURPOSE:To obtain a supporting device suitable for large capacity and high density of a magnetic disc device by constituting a load spring of the supporting device with a hollow beam having a thin close section to float stably a floating head. CONSTITUTION:A load spring 3a has a plane structure, and a gimbals spring 3b is connected to the tip part of the load spring 3a. Meanwhile, a load spring 3b has a shell structure and is so set that the section is reduced according as going toward the tip, and this load spring 3b is joined to the load spring 3a in the side end part into one body to constitute the load spring having a hollow thin close section. The part to which a tension bend is applied is in the plane structure completely, and the aging change is small, and the workability is good.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head used in a magnetic disk drive, and particularly to a support device 1 that supports a floating head. Generally, a floating RAD slider, which is a dynamic pressure type gas bearing, is used as a floating head for a magnetic disk device. The floating RAD slider floats above the surface of the recording medium with a very small gap, but in order to achieve constant and stable floating, the mechanism that supports the floating head is the parallelism that the slider performs while floating above the surface of the recording medium. It consists of a soft gimbal spring section with an extremely small spring constant that restrains movement in each direction of pitch and roll and holds the slider.

FIGS. 1(a) and 1(b) show a plan view and a side view of a conventional floating head support device. 1a in the diagram
is the load spring, 1b is the gimbal spring, and IC
is the floating part, and 1d is the part called the flange.

A flange 1d of uniform width is attached to the load spring portion 1a in order to increase its rigidity, and it becomes a beam with a thin open cross section consisting of a total of three planes, two flanges la and ld in Fig. 1. ing. Figure 2 (a), (b)
show the cross-sectional shapes taken at points 1 and 2 in FIG. 1(b), respectively. By attaching the flange, the bending stiffness and torsional stiffness of the entire load spring are increased compared to when only la exists as a beam element, and as a result, the natural frequency of the load spring takes a high value. It has become. A high natural frequency is important for the dynamic characteristics of a load spring, but the load spring has the function of not only applying a load to the floating head anti-rider, but also supporting the slider and gimbal spring. , in the case of a normal movable head type magnetic disk device,
The magnetic head performs an access movement to any track on the recording medium surface -H using a linear or rotary actuator, and the load spring section is designed to avoid resonance with the vibrations generated by the access movement. It is necessary to make the rigidity sufficiently high. Furthermore, in recent magnetic disk drives, the flying height of the slider has reached the submicron range, so the head disk has a sealed structure in order to prevent the slightest amount of dust from getting mixed in. For this reason, a high-speed airflow is generated in the sealed reuraud as the disc rotates at high speed, but the load spring must have sufficiently high rigidity to prevent the slider from being affected by this airflow. shall be. The slider floating above the surface of the recording medium is affected by the surface runout and waviness of the medium surface, resulting in complex vibrations consisting of three degrees of freedom: parallel motion, pitching motion, and rolling motion.Furthermore, the actuator The magnetic head is positioned on a desired track on the medium surface with high precision, and the achieved vibration causes a significant decrease in the positioning precision of the actuator, leading to errors in recording and reproducing on the magnetic disk and uneven recording density. Introducing.

Considering the conventional floating head support device from the above points,
In order to increase mechanical rigidity, the load spring adopts a thin open cross-section beam structure consisting of three planes. Furthermore, in order to increase the rigidity and improve the dynamic characteristics, it is effective to increase the width of the flange part or thicken the plate thickness of the load spring part. Due to the structure, the ratio of increase in rigidity to increase in weight is low, making it difficult to significantly improve dynamic characteristics, and the load spring vibrates significantly due to mechanical excitation from the actuator to position the floating head on the desired track. There was a drawback.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a floating head support device that eliminates the various drawbacks mentioned above, increases the rigidity of the floating head support device, increases the natural frequency of the support device, and has excellent dynamic characteristics. It is in.

According to the present invention, by forming the load spring portion as a hollow beam having a thin-walled closed cross section, its bending and torsional rigidity are significantly increased with a relatively low weight, and as a result, the dynamic characteristics of the entire floating head support device are improved. In addition, it has been designed to exhibit extremely good dynamic characteristics against mechanical vibrations.

As described above, the floating head support device according to the present invention realizes stable floating of the floating head, and is extremely suitable for increasing the capacity and density of magnetic disk drives.

Embodiments of the present invention will be described in detail below with reference to the drawings.

3(a), (b), (C), and (d) are diagrams showing the first embodiment of the present invention, and are structural diagrams of a floating head support device, and 3a and 3b are load springs,
3b is a gimbal spring, and 3C is a floating head.

Figure 3(C) and Figure 3(d) are respectively Figure 3(b).
1 is a diagram showing a cross-sectional shape taken at points 1 and 2 in 1. FIG. The load spring 3a has a planar structure, and a gimbal spring 3b is coupled to the tip.

On the other hand, the load spring 3a has a shell structure, and the cross section is set to become smaller as it approaches the tip.The load spring 3a is joined at the side end and is integrated with the load spring 3a, which has a hollow thin-walled closed cross section. It makes up a spring.

FIGS. 4(al), (b), (C1, (d) are diagrams showing a second embodiment of the present invention, 4a and 4d are load springs, 4b is a gimbal spring, and 4C is a floating head. 4(C) and 4(d) are diagrams showing the cross-sectional shapes at point 1 and point 2 in FIG. 4(b), respectively.The difference from the first embodiment is that the load spring 4a , 4d both have a shell structure, and the load spring 4a is connected between the point P where the spring is connected to the gimbal spring 4b and the point Q which is the starting point of the part where tension bending is applied to the load spring 4a. In other parts, the load spring 4a has a shell structure, and in other parts, the load spring 4a has almost the same shape as the planar structure load spring 1a shown in FIG. 1. This shows the transition from the shell structure to the planar structure. The positions of points P and Q may be set at optimal positions taking into consideration the shape and curvature of the shell structure.

Figures 5 (a), (b), (C), and (d) are diagrams showing a third embodiment of the present invention, in which 5a and 5d are road splinters, 5b is a gimbal spring, and 5C is a floating head. . 5(C) and 5(d) are diagrams for showing the cross-sectional shapes at points 1 and 2 in FIG. The difference from the above embodiments 1 and 2 is that
The angle effect is the same.

Now, generally speaking, a load spring has a structure in which tension bending is applied to the root portion of the load spring to apply the load as a simple plate, but in the floating head support device of the present invention, the portion to which the tension bending is applied is applied. is the first. The first embodiment has a completely planar structure, and the shell structure in the second embodiment also smoothly transitions into a planar structure, so there is no problem with aging or workability.

As described above in detail about the present invention, by using the load spring of the floating head support device as a hollow, thin-walled beam having a closed cross section, the drawbacks of the conventional floating head support device can be eliminated and the object of the present invention can be fully achieved. can be achieved.

Note that any changes may be made without departing from the spirit of the present invention; for example, the shape of the thin-walled closed cross section, the curvature of the shell structure, etc. may be optimal for each case (the above). It is clear that the examples are not intended to limit the scope of the invention.

[Brief explanation of drawings]

Figures 1 (a) and (b) are diagrams showing the structure of a conventional floating head support device, Figures 2 (a) and (b) are diagrams showing its cross-sectional shape, and Figures 3 (a) and (b). , (C)
, (d) is a diagram showing a first embodiment of the floating head support device of the present invention, which is characterized in that the load spring employs a hollow, thin-walled beam with a closed cross section, and FIG. ), (b), (C), (d), Figure 5 (al, (b), (C), (dl) are diagrams showing the second and third embodiments, respectively. In the figures, la, 3a, 4a, 5a are load springs, lb, 3b, 4b, 5b are gimbal springs, lc, 3c, 4c, 5c are floating heads, ld, 3d,
,ld. 5d is a flange.

Claims (1)

[Claims] In a floating head support device consisting of a load spring that applies a load to the floating head and a gimbal spring that is coupled to the load spring at one end and supports the floating head, the load spring has a hollow closed cross section. Features a floating head support device.