JPS58177560A - Flexible magnetic disk device - Google Patents

Abstract

PURPOSE:To use a disk in a high-speed rotating state and to use even the disk surface on where no stabilizing plate is present, by providing a magnetic head device on the opposite side to the stabilizing plate with a flexible disk between. CONSTITUTION:When the flexible disk 1 is pressed toward the stabilizing plate 2 by the magnetic head 3, these is a range where repulsive force increases in proportion to the extent of displacement of the disk. The range of the displacement extent which causes said condition, through varies with the rotating speed of the disk, attains hundreds mum at relatively high speed rotation. Therefore, the magnetic head is pressed against the flexible disk from the side where no stabilizing plate is present to hold the head in excellent contact by the repulsive force produced in the desk unless the disk is deformed beyond said range.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a magnetic disk device using a flexible disk, and particularly to a magnetic disk device using a flexible disk at high speed rotation.

(b) Technical background and prior art Disc-type magnetic recording devices for information processing systems include:
There are those that use rigid disks and those that use flexible disks (usually called floppy disks). In devices using rigid disks, the magnetic disk rotates at a relatively high speed (3600r, p, m,), and therefore the access time is short, whereas flexible disks are based on a 75 μm thin polyester plate, so they can be used at high speeds. Rotation causes the problem of vibration generation.

With flexible disks, the diskette is housed in a case to prevent it from deforming, but that alone cannot hold it in place, so it must be used at relatively low rotational speeds, usually around S 60 r, p, vg. This causes access to take a relatively long time.

Rotate the flexible disk faster (1500
~3600 r,p,meng), various attempts have been made to shorten the access time, but a method using a stabilizing plate called a Hernoulli plate is known as a means of suppressing vibrations during high-speed rotation. There is.

As shown in Fig. 1, a flat plate 2, which is a stabilizing plate, is installed close to a flexible disk 1 that rotates at high speed.As the disk rotates, a high-speed airflow is generated between the disk and the flat plate. Because the pressure is reduced, the disk is pressed against the stabilizer plate by atmospheric pressure, suppressing the occurrence of vibrations.

In this case, the magnetic head 3 for recording and reproducing is as shown in FIG.
), it is pressed against the disk from the stabilizer plate side through the bare F insertion hole 4 provided in the stabilizer plate 2. Since these are opposite to each other, a force that restores the deformation of the disk caused by the pressure of the head works reliably, and good contact between the head and the disk can be obtained.

Figure 2 (b) shows the relationship between the amount of displacement of the disk caused by the pressure of the head and the repulsive force that tries to return to its original position when the head is installed on the stabilizing plate side. It has been shown that the repulsion force increases accordingly.

Furthermore, in the above description, when the phenomenon is expressed as the head pushing the disk, there is a layer of flowing air between the head and the disk, and the pressing force acts through this air layer. Although the situation is slightly different from pressing in a stationary state, it is expressed this way to avoid complexity. This also applies to the case of contact between the head and the disk, and is also the same in the following description.

(C) Problems with the conventional technology As mentioned above, in the method that uses atmospheric pressure for contact between the head and the disk, the position where the head is installed is limited to the stabilizing plate side. Flexible magnetic disk devices have not yet been put into practical use.

(d) Object of the Invention An object of the present invention is to provide a flexible magnetic disk device in which a flexible disk can be used at high speed rotation, and the disk surface on the side without a stabilizer can also be used.

(8) Structure of the Invention In order to achieve this object, the flexible magnetic disk device of the present invention includes at least a mechanism for rotating a flexible disk for magnetic recording at a relatively high speed, and a mechanism for rotating the magnetic disk during rotation. and a magnetic head device for recording or reproducing predetermined information on the magnetic disk. Based on the new knowledge that a restoring force is generated in the disk within a specific displacement range, the flexible disk is provided on the opposite side of the stabilizer plate, sandwiching the flexible disk.

(f) Embodiments of the Invention The present invention provides that even when a high-speed rotating flexible disk is pushed toward a stabilizing plate, as long as the amount of displacement of the flexible disk is small, the repulsive force that restores the deformation of the disk is generated. This is based on new findings obtained by the present inventors that this phenomenon occurs.

That is, when the flexible disk 1 is pushed toward the stabilizer plate 2 by the magnetic head 3, as shown in FIG. 3(a), a repulsive force is generated in proportion to the displacement of the disk, as shown in FIG. 3(b). It has been found that there are increasing ranges. The range of displacement that causes such a situation varies depending on the rotational speed of the disk, but at the above-mentioned rotational speed, the displacement range is on the order of several hundred μm.

Therefore, as long as the disk is not deformed beyond this range, it is possible to press the magnetic head against the flexible disk from the side without the stabilizer and maintain good contact by the repulsive force generated on the disk.

The reason why a restoring force is generated in the disk in the above displacement range has not yet been elucidated, but the disk is deformed by the pressure of the head, and as a result, the air flow path between the disk and the stabilizer plate is partially narrowed. , it is presumed that as the air tries to flow there, a force is generated in the direction of pushing back the head.

That is, the idea is that while the overall pressure against the stabilizing plate is maintained by atmospheric pressure, the pressure on the back surface of the portion pressed by the head increases, pushing the disk in a direction that pushes the head back. Furthermore, if the disk is pushed beyond this limit, there will be a large pressure drop in the airflow between it and the disk immediately after passing through the pressing part, which not only reduces the repulsive force but also increases the displacement of the disk. It is thought that this will happen.

Since the repulsive force is not very large, the pressing force of the head cannot be large. Therefore, in order to obtain good contact, consideration must be given to the shape of the slider of the magnetic head and the holding mechanism.

As shown in FIG. 4, when the contact surface 12 of the slider 11 is a normal spherical surface, it is self-effective to provide the center portion with pivot support by the spherical protrusion 13 and the peripheral portion with gimbal support by the spring 14. If you do this,
Even with a relatively weak pressing force, the core portion 15 of the head can properly contact the disk surface. The material of the slider is generally ceramic such as barium titanate.
6 is a leaf spring for pressing the slider against the disk.

FIG. 5 shows a slider in which the slider central portion 11' where the core portion is provided is spherical and further has a crown-shaped bulge 17 around the periphery. When a slider having such a shape is brought close to a flexible disk rotating at high speed, a suction force is generated due to the airflow generated between the bulge 17 and the disk, and a phenomenon occurs in which the relative position of the disk and slider is kept constant. Ru. Although the slider itself having this shape is known, it is effective even when used in the present invention, and is even more effective when used in combination with the gimbal support.

As explained above, according to the present invention, it is possible to record/reproduce on a flexible disk from the side without the stabilizer, but it is also possible to record/reproduce from the normal stabilizer side. This allows the flexible disk to be rotated at high speed and used on both sides.

In that case, it is not possible to have the heads on both sides face each other by sandwiching the disk between them, but it is possible to have them face each other in relatively close positions.By configuring them in this way, two sets of head devices can be combined into one It becomes possible to drive with an actuator.

(g) Effects of the Invention According to the present invention, the access time when recording/reproducing on both sides of a flexible disk is significantly shortened.

[Brief Description of the Drawings] Fig. 1 shows the positional relationship between the stabilizer plate and the flexible disk, Fig. 2 shows the principle of the prior art, Fig. 3 shows the principle of the present invention, and Fig. 4 5 is a diagram showing a method of supporting a spherical slider, and FIG. 5 is a diagram showing the shape of a slider with a crown-shaped bulge. In the figure, l is a flexible disk, 2 is a stabilizer, and 3 is a magnetic The head, 4 is the head insertion hole, 11 is the slider, 11' is the center of the slider,
12 is the surface of the slider, 13 is a pivot support protrusion, 14 is a spring, 15. 16 is a leaf spring, and 17 is a crown-shaped bulge. Figure l also Figure 2 Figure 3 Figure 4 Figure S

Claims (2)

[Claims] (1) At least a mechanism for rotating a flexible disk for magnetic recording at a relatively high speed, a stabilizing plate for suppressing vibrations during rotation of the magnetic disk, and a mechanism for recording or re-reading predetermined information on the magnetic disk. What is claimed is: 1. A flexible magnetic disk device comprising a magnetic head device for controlling the flexible disk, wherein the magnetic head device is provided on a side opposite to the stabilizing plate with the flexible disk sandwiched therebetween. (2) In addition to the magnetic head device, another magnetic head device is provided on the same side of the flexible disk as the stabilizing plate. disk device.