JPH02162563A - Stable rotating device for flexible recording medium disk - Google Patents

Abstract

PURPOSE:To prevent the invasion of dust in a fine interval by providing a fan-shaped air bearing plate which has a surface to show satisfactory flatness on a substrate and providing the thin liner of unwoven fabric in the other part of the substrate. CONSTITUTION:In the part of a liner 12 provided in the part excepting for a fan-shaped air bearing plate 11 in a substrate 9, a thin layer air current flowing from the inner circumference of a flexible recording medium disk 17 to an outer circumference flows to the interval of fiber (f) which constitutes the liner 12. Thus, the dust included in the air is removed by the fiber (f) which constitutes the liner 12. The upper part of the fiber (f) contacts the surface of the disk 17 and removes the dust which is attached on the disk 17 and an electrostatic charge is not charged in the disk 17. Thus, even when the disk 17 is rotated at a high speed, charging is generated in the disk 17 and electrostatic attraction is not generated in the interval with the plate 11.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a device for stably rotating a flexible recording medium disk.

(Prior Art) In recent years, high-density recording and reproduction of information signals has become necessary in various technical fields. Of course, various recording and reproducing methods have been used to realize this, and recently, electromagnetic waves, electric fields,
A recording medium whose recording layer is made of a material that undergoes a phase change from an amorphous state to a crystalline state or from a crystalline state to a non-crystalline state when applied with electric current or heated is rewritable. This has attracted attention due to its high performance, and research into the practical application of high-density recording and reproducing methods for information signals using such recording media has been actively conducted.

Regardless of the recording/reproducing method employed, it is well known that the distance between the recording medium and the recording/reproducing element used when recording and reproducing information signals must always maintain a predetermined relationship. be.

By the way, as magnetic recording media used in the magnetic recording and reproducing system, various configurations are known, such as tape-shaped media, sheet-shaped media, disc-shaped media, etc. The disk-shaped magnetic recording medium mentioned above may be a rigid magnetic disk in which a recording layer made of a magnetic material is formed on the surface of a rigid disk, or a recording layer made of a magnetic material is formed in the surface of a flexible thin film. Magnetic disks (for example, floppy disks) having flexible properties are widely known.

The above-mentioned rigid magnetic disks are manufactured by applying high-precision polishing to the surface of the basic disk, and then forming a recording layer of magnetic material using methods such as plating or vapor deposition, so they are expensive. It is well known that flexible magnetic disks (for example, floppy disks) are used in devices that require low cost.

By the way, flexible magnetic disks (such as floppy disks) were generally used by rotating them at low speed in a container, but in recent years, flexible magnetic disks (such as floppy disks) Many proposals have been made to increase the speed and reliability of floppy disks (for example, floppy disks).

FIG. 5 is a side sectional view of a conventional device in which a flexible magnetic disk (for example, a floppy disk) is rotated at high speed in a space spaced at a constant distance from a flat substrate. 5, 1 is a substrate with good flatness, 2 is a flexible magnetic disk (for example, a floppy disk), 3 is a rotating shaft driven and rotated by a rotational drive source (not shown), 4 is a turntable, 5 is a clamper, 6 is a magnetic head, and 7 is an air intake port.

In the conventional device shown in FIG. 5, when the rotation shaft 3 is rotated at high speed, the turntable 4 integrated with the rotation shaft 3
Since the floppy disk 2 fixed by the clamper 5 is rotated at high speed, the air sucked in from the air intake lower as shown by arrow A in the figure fills the gap between the board 1 and the floppy disk 2. The fluid flows as a thin layer fluid from the center of the disk 2 toward the outer periphery and is discharged from the outer periphery of the floppy disk 2 as shown by arrow B in the figure.

The conventional device shown in FIG. 5 operates as an air damper by a thin layer of fluid flowing through the gap between the substrate 1 and the floppy disk 2 from the center of the floppy disk 2 toward the outer periphery. floppy disk 2
It is intended that the state of contact between the surface of the floppy disk and the magnetic head 6 be good over the entire recording/reproducing area of the floppy disk 2. However, in the actual operating state of the conventional device shown in FIG. Since the gap between the substrate 1 and the floppy disk 2 becomes narrower as you move toward the outer periphery of the disk 2, the state of contact between the surface of the floppy disk 2 and the magnetic head 6 becomes smaller as you move toward the outer periphery of the floppy disk 2. Gradual deterioration became a problem, and in order to solve this problem, a rotating device for a flexible magnetic disk was proposed as disclosed in Japanese Patent Publication No. 13419/1983.

FIG. 6 is a side sectional view of a rotating device for a flexible magnetic disk disclosed in Japanese Patent Publication No. 52-13419 mentioned above;
FIG. 7 is a perspective view of a spacer, and the flexible magnetic disk rotating device shown in FIG. It has a configuration in which a spacer 8 as illustrated in FIG. 7 is inserted.

The spacer 8 described above has a height that gradually increases from one end a to the other end, and has a flat part C that comes into close contact with the substrate 1 and a curved face d that faces the surface of the floppy disk 2.
The substrate 1 is arranged in such a manner that its one end a is located on the inner circumferential side of the floppy disk 2, and the other end thereof is located on the outer circumferential side of the floppy disk 2. and the floppy disk 2.

In the flexible magnetic disk rotating device shown in FIG. 6, the above-described spacer 8 is provided in the gap between the substrate 1 and the floppy disk 2. Since the spacing is constant from the inner circumference to the outer circumference of the floppy disk, the state of contact between the surface of the floppy disk 2 and the magnetic head 6 can be made substantially constant from the inner circumference to the outer circumference of the floppy disk 2.

(Problem to be Solved by the Invention) However, in the flexible magnetic disk rotating device described with reference to FIG. By providing the spacer 8 in the gap between the board 1 and the floppy disk 2, the load on the motor that drives the floppy disk increases, increasing power consumption and shortening its life. The floppy disk 2 is narrowed by a spacer 8 inserted into the gap between the substrate 1 and the floppy disk 2 in order to keep the distance between the substrate 1 and the floppy disk 2 constant from the inner circumference to the outer circumference of the floppy disk. Problems arise, such as the fact that the dust that has entered the gap tends to deteriorate the contact relationship between the magnetic head 6 and the floppy disk 2.

(Means for Solving the Problems) The present invention provides a substrate having a reference plane larger than a flexible recording medium disk to be rotated and having a through hole in the center; In the annular region including the moving range of the recording/reproducing element on the substrate, the fan-shaped part including the moving range of the recording/reproducing element has a fan-shaped air having a surface exhibiting good flatness. A bearing plate is provided on the substrate, and the upper part of the constituent fibers reaches near the surface of the air bearing plate on the substrate in the portion of the annular region other than the fan-shaped air bearing plate. To provide a stable rotation device for a flexible recording medium disk, which is provided with a thin liner made of non-woven fabric.

(Function) A substrate having a reference plane larger than the flexible recording medium disk being rotated and having a through hole in the center, and movement of a recording/reproducing element on the substrate. A fan-shaped air bearing plate having a surface exhibiting good flatness is provided on the substrate in the fan-shaped portion including the movement range of the recording/reproducing element in the annular region including the range, and A thin liner made of non-woven fabric with the upper part of the constituent fibers reaching near the surface of the air bearing plate is provided on the substrate in the portion of the annular region excluding the fan-shaped air bearing plate, and When the flexible recording medium disk is rotated at high speed above the air bearing plate and the liner, air sucked in from the center of the substrate fills the gap between the substrate and the flexible recording medium disk. It passes from the inner circumference of the disk to the outer circumference.

As mentioned above, among the air that is sucked in from the center of the board and passes through the annular region, the air that passes over the air bearing plate forms a thin layer of air on the air bearing plate, and A portion of the flexible recording medium disk is placed in a position parallel to the air bearing plate at a predetermined minute distance from the air bearing plate.

In addition, when the air passing through the liner passes through the gaps between the fibers that make up the liner, dust contained in the air is captured by the fibers, causing the air bearing plate to become flexible. This prevents dust from entering the small gap between the liner and the recording medium disk, and the upper part of the fibers that make up the liner is in contact with the flexible recording medium disk, which allows dust to flex. The flexible recording medium disk is removed from the flexible recording medium disk to prevent dust from entering the minute gap between the air bearing plate and the flexible recording medium disk.

(Example) Hereinafter, specific contents of the stable rotation device for a flexible recording medium disk of the present invention will be explained in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a schematic configuration of a main part of a device for stably rotating a flexible recording medium disk of the present invention, and FIG. a side sectional view showing a state in which a recording/reproducing operation is performed on a recording medium disc;
FIG. 3 is a perspective view of a cartridge in which the stable rotation device for a flexible recording medium disk of the present invention and a flexible recording medium disk are delivered into a container (a part of the container is crushed to examine the internal state). FIG. 4 is a schematic diagram illustrating the structure of the nonwoven fabric.

In FIG. 1, reference numeral 9 denotes a substrate which has a reference plane larger than the flexible recording medium disk being rotated and is equipped with a through hole 10 in the center;
is a fan-shaped air bearing plate with good flatness, and 12 is a thin liner made of non-woven fabric, and both the fan-shaped air bearing plate 11 and the thin liner 12 made of non-woven fabric are continuous on the substrate 9. It forms an annular area.

The fan-shaped air bearing plate 11 described above is provided at a position that includes the movement range of the recording/reproducing element, and
The liner 12 is made of a thin non-woven fabric in which the upper portions of the fibers f, f, etc. that make up the liner reach near the surface of the air bearing plate.

The annular region formed by both the fan-shaped air bearing plate 11 and the liner 12 has an outer peripheral portion that protrudes outward from the outer peripheral portion of the flexible recording medium. It is said to be of such a size that it can be done.

The air bearing plate 11 described above is made by mirror-polishing the surface of a thin plate of metal material, for example, a thin plate of stainless steel with a thickness of 100 to 150 microns.

It can be made by applying a thin film of carbon to the surface by applying a sputtering method or a diffusion method, and then processing it into a predetermined fan shape by etching, for example. This is a sloped surface (introduction surface) for smoothly introducing air into the upper surface of 11.

The above-mentioned bearing plate 11 has a mirror surface with no scratches and good flatness, and also does not produce any cracks during molding.Furthermore, the mirror surface is covered with a hard carbon thin film. Because it is coated, it has the advantage that it will not be scratched by dust during use and the dust attached to the scratches will gradually grow and interfere with the stable rotational operation of the flexible recording medium disc.

FIG. 2 is a diagram for explaining that the rotating state of the flexible recording medium disk is stabilized by the flexible recording medium disk stable rotation device of the present invention shown in FIG. 1 above. In FIG. 2, 13 is the base plate of the recording/reproducing device;
4 is a drive motor, 15 is a turntable, 16 is a clamper, 17 is a flexible recording medium disk, 18 is a recording/reproducing element (magnetic head), and 19 is a pressing force that applies a predetermined pressing force to the magnetic head 18 from an arm 20. Point 21 is a transfer mechanism for moving and displacing the magnetic head 18 attached to the arm in the radial direction of the flexible recording medium disk 17 within its movement area.

On the base plate 13 of the recording/reproducing device, there is provided a substrate 9 in a device for stably rotating a flexible recording medium disk as shown in FIG. An annular region is formed by a fan-shaped air bearing plate 11 having good flatness and a thin liner 12 made of nonwoven fabric.

The flexible recording medium disk 17 is connected to the turntable 15.
After placing it on the turntable 15, it is fixed to the turntable 15 by the clamper 16, and is rotated at a predetermined number of rotations by the drive motor 14.
For example, it is rotated at 1800 rpm to 3600 rpm.

The center position of the flexible recording medium disk 17 is determined by a dowel pin protruding from the turntable 15, and rotation is prevented by a rotation preventing protrusion provided on the turntable 15. The flexible recording medium disk 17 and the turntable 15 are integrally formed by a fan-shaped air bearing plate 11 on the substrate 9 and a thin liner 12 made of non-woven fabric in the above-described stable rotation device for a flexible recording medium disk. It can rotate at high speed above the annular area.

As a result, the hole in the base plate 13 and the center hole 1 in the substrate 9 are connected to each other.
The air sucked in through the fan-shaped air bearing plate 11 on the substrate 9 and the thin liner 1 made of non-woven fabric
2 and the flexible recording medium disk 17 as a thin layer air flow from the inner circumference to the outer circumference of the flexible recording medium disk 17.

Then, a fan-shaped air bearing plate t on the board 9
The thickness of the air layer in the gap between the surface of the flexible recording medium disk 17 and the flexible recording medium disk 17 depends on the support height of the center of the flexible recording medium disk 17 and the rotation speed of the flexible recording medium disk 17. It has a predetermined thickness determined by In addition, in the liner 12 provided on the substrate 9 except for the fan-shaped air bearing plate 11, a thin air flow flowing from the inner circumference to the outer circumference of the flexible recording medium disk 17 flows through the liner 12. It flows through the gaps between the fibers f, f... that make up the fibers.

A predetermined thickness (
For example, a flexible recording medium disk with a diameter of 90 mm is
When rotating at Orpm, 80 microns to 15
A magnetic head 18 is applied which applies a predetermined suppressing force from an arm 20 via a suppressing point 19 to a rotating flexible recording medium disk 17 with a thin layer air flow (about 0 microns) interposed therebetween. When the flexible recording medium disk 17 contacts the magnetic head 18, it sinks, and the thickness of the thin layer of air flow on the air bearing plate 11 in that part is equal to that of the air bearing plate 11 in other parts. Plate 11
Thinner than the thickness of the upper laminar airflow.

As described above, the shape of the flexible recording medium disk 17 rotating with a thin air flow of a predetermined thickness interposed on the air bearing plate 11 is determined by the surface of the air bearing plate 11 as is well known. Since the shape is similar to that of the air bearing plate 11, if the air bearing plate 11 with good flatness is used as already described in FIG. The shape of the medium disk 17 also exhibits good flatness due to the air bearing effect caused by the thin layer of air flow on the air bearing plate 11, and the deformation due to surface runout of the flexible recording medium disk 17 is within a few minutes. It can be improved by a factor of several tenths.

In addition, the flexible recording medium disk 17 in the air bearing plate 11 has a good air bearing effect due to the use of the air bearing plate 11 with good flatness. Regardless of where the magnetic head 18 is located along the line, the state of the dent in the flexible recording medium disk 17 caused by the magnetic head 18 is always the same.

The degree of improvement in the deformation of the flexible recording medium disk 17 obtained by the above-mentioned air bearing effect increases as the thickness of the 111M air flow formed on the air bearing plate 11 becomes thinner. When the distance between the disk 17 and the surface of the air bearing plate 11 is reduced, dust contained in the air is trapped between the flexible recording medium disk 17 and the surface of the air bearing plate 11 and moves slowly. , that is air bearing plate 1
When the dust reaches the position of a very slight scratch or dent on the surface of 1, the dust digs into the very slight scratch or dent and settles there, and one after another the dust is attracted to the fixed dust and gradually As the dust grows larger, concentric scratches occur on the surface of the flexible recording medium disk 17 due to the dust, which may cause the flexible recording medium disk 17 to break.

In order to prevent such problems from occurring, it is possible to increase the distance between the flexible recording medium disk 17 and the surface of the air bearing plate 11, but if such a solution is taken, , the degree of improvement in deformation of the flexible recording medium disk 17 due to the air bearing effect described above becomes small,
The contact state between the magnetic head 18 and the flexible recording medium disk 17 becomes unstable, and good recording and reproducing operations cannot be performed.

Next, when the flexible recording medium disk 17 is rotated at high speed in the air, the flexible recording medium disk 17 is charged due to the friction between the flexible recording medium disk 17 and the air, and the flexible recording medium disk 17 is The flexible recording medium disk 17 is attracted to the air bearing plate 11 by the electrostatic attraction force generated between the electrostatic charge generated on the recording medium disk 17 and the air bearing plate 11, and the flexible recording medium disk 17 rotates. It may happen that the recording medium disk 17 suddenly stops, and in this case, the inertia force causes the flexible recording medium disk 17 to become combed and damaged.

Further, when the flexible recording medium disk 17 in the stopped state starts rotating, the flexible recording medium disk 17 in the stopped state
If the flexible recording medium disk 17 is attracted to the air bearing plate 11 due to static charge, the flexible recording medium disk 17 may become combed and damaged when the flexible recording medium disk 17 starts rotating. .

The adhesion phenomenon due to the electrostatic attraction force caused by the static electricity charging described above appears significantly when the polarity of the electrostatic charge generated on the flexible recording medium disk 17 and the polarity of the electrostatic charge generated on the air bearing plate 11 are different. . If a dielectric material that easily generates static electricity is used as a constituent material, the above-mentioned adhesion phenomenon is likely to occur. It is important to select constituent materials that are unlikely to cause this.

However, in the stable rotation device for a flexible recording medium disk of the present invention, the inner part of the flexible recording medium disk 17 is located at the liner 12 provided on the substrate 9 except for the fan-shaped air bearing plate 11. The thin layer air flow flowing from the periphery to the outer periphery is caused by the fibers f, f... forming the liner 12.
Since the air flows through the gap, the dust contained in the air is removed by the fibers f, f, etc. that make up the liner 12, and the fibers f, f,... that make up the liner 12 are removed.
The upper part of ... contacts the surface of the flexible recording medium disk 17 to remove dust attached to the flexible recording medium disk 17, and to prevent static charges from being charged on the flexible recording medium disk 17. Therefore, the above-mentioned problems do not occur in the present invention.

That is, the liner 12 is made of a non-woven fabric, and the non-woven fabric, as shown in the schematic diagram of FIG.
For example, it is fixed by ultrasonic welding (the fixed points are indicated by circles in Fig. 4), so the large number of fibers f, f, ... Due to the air flowing between them, some air bearing effect is produced on the liner 12, and the above-mentioned fibers f, f... are flexible records rotating at high speed in the upper part. Since the surface of the medium disk 17 can be brought into contact with an extremely small contact pressure, dust can be removed as described above and static electricity can also be prevented from being generated.

Note that the liner 12 is composed of fibers f, f.
・It has high mechanical strength and is resistant to friction.
It is constructed using fibers that will not generate dust when cut, and the fibers f, f,
. . . A structure is used in which fibers are selected so that air flow can easily pass between them, and which does not generate large static electricity due to friction with the flexible recording medium disc 17. Ru. It is desirable that the above-mentioned materials have some degree of conductivity.

As mentioned above, above the annular area formed by the fan-shaped air bearing plate 11 with good flatness and the thin liner 12 made of nonwoven fabric, which is provided on the substrate 9 on the base plate 13 of the recording/reproducing apparatus. The flexible recording medium disk 17, which rotates at a speed of 1800 rpm to 3600 rpm, for example, as shown in FIG. Due to the bearing effect, the substrate 9 rotates while floating in the space above it, but the air bearing effect in the thin liner 12 made of non-woven fabric is stronger than the air bearing effect in the fan-shaped air bearing plate 11 on the substrate 9. Since the bearing effect is smaller, the flexible recording medium disk 17 rotating above the annular area formed by the fan-shaped air bearing plate 11 and the non-woven fabric liner 12 is perfectly parallel to the substrate 9. There will be no situation.

That is, the flexible recording medium disk 17 is parallel to the substrate 9 at the fan-shaped air bearing plate 11, but the thin liner 12 made of nonwoven fabric
In the part that corresponds to.

As illustrated in FIG. 2, the substrate 9
It will rotate while approaching .

As described above, since the fan-shaped air bearing plate 11 is configured to have sufficiently good flatness, the flexible recording medium disk 17 corresponding to that portion is a fan-shaped air bearing. m flexible recording medium disk 17 due to good air bearing effect on the plate 11
When the flexible recording medium disk of the present invention is rotated at 240 rpm on the stable rotation device shown in the figure,
It was found that an approximately 20 dB improvement in surface runout could be obtained compared to the conventional device.

In FIG. 2, the magnetic head 18, which is transferred in the radial direction of the flexible recording medium disk 17 by the transfer mechanism 21, is placed in a fan-shaped state under a predetermined pressing force from the arm 20 through the pressing point 19. The flexible recording medium disk 17 is transported in the radial direction at a position corresponding to approximately the center of the air bearing plate 11 to reach a predetermined recording trace (track) position.

As described above, when a thin stainless steel plate coated with a thin carbon film is used as the fan-shaped air bearing plate 11, the surface of the soft stainless steel material is covered with a hard carbon film, which prevents air from flowing. The fan-shaped air bearing plate 11 is designed so that the surface of the bearing plate 11 is not damaged by dust, the carbon film itself attracts dust and is hazy, and the attached dust has excellent removability. Even if dust enters the gap between the recording medium disk 17 and the flexible recording medium disk 17, the dust will not grow there.

In the stable rotation device for a flexible recording medium disk of the present invention, since dust is removed by the fibers f and f of the liner 12 as described above, the fan-shaped air bearing plate 11 and the flexible Although it is rare for dust to enter the gap between the recording medium disk 17 and the fan-shaped air bearing plate 11 and the flexible recording medium disk 17, the dust will grow there. As mentioned above, such a situation does not occur, and in the stable rotation device for a flexible recording medium disk of the present invention, the fan-shaped air bearing plate 11 is used so that the air bearing effect of the air bearing plate 11 can be sufficiently obtained. The gap between the flexible recording medium disk 17 and the magnetic head 18 is made sufficiently small to reduce the amount of depression of the surface of the flexible recording medium disk 17 when the magnetic head 18 is in contact with the flexible recording medium disk 17. ,
The contact between the magnetic head 18 and the flexible recording medium disk 17 can be made good at any part of the flexible recording medium disk 17 in the radial direction.

FIG. 3 is a perspective view of a cartridge constructed by housing the flexible recording medium disk stable rotation device shown in FIG. 1 and the flexible recording medium disk 17 in a container 22; It has been crushed to show the inside.

(Effects of the Invention) The present invention provides a substrate having a reference plane larger than a flexible recording medium disk to be rotated and having a through hole in the center, and a substrate on the substrate. In the annular region including the movement range of the recording/reproducing element, a fan-shaped air bearing plate having a surface exhibiting good flatness is placed on the substrate in the fan-shaped part including the movement range of the recording/reproducing element. A thin liner made of non-woven fabric is provided on the substrate in the annular region except for the fan-shaped air bearing plate, and the upper part of the constituent fibers reaches near the surface of the air bearing plate. The flexible recording medium disk is rotated at high speed above the air bearing plate and liner, and the air sucked in from the center of the substrate fills the gap between the substrate and the flexible recording medium disk. The flexible recording medium is passed from the inner circumferential side to the outer circumferential side of the disk, and as mentioned above, the air is sucked in from the center of the substrate and passes through the annular area described above, and then passes over the air bearing plate. A thin layer of air is formed on the air bearing plate, and the flexible recording medium disk in that area is placed parallel to the air bearing plate at a predetermined minute distance from the air bearing plate. In addition, when the air passing through the liner passes through the gaps between the fibers that make up the liner, the dust contained in the air is captured by the fibers, resulting in an air bearing. Dust should not be allowed to enter the minute gap between the plate and the flexible recording medium disk, and the upper part of the fibers making up the liner should be in contact with the flexible recording medium disk. As a result, dust is removed from the flexible recording medium disk and dust can be prevented from entering the minute gap between the air bearing plate and the flexible recording medium disk. In stable rotating equipment, air bearing plate 1
The gap between the fan-shaped air bearing plate and the flexible recording medium disc is made sufficiently small so that the air bearing effect due to It is possible to reduce the sinking of the surface of a flexible recording medium disk so that the contact state between the magnetic head and the flexible recording medium disk is good at any part in the radial direction of the flexible recording medium disk. It is possible,
According to the present invention, the problems with the conventional devices described above can be satisfactorily solved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a schematic configuration of a main part of a device for stably rotating a flexible recording medium disk of the present invention, and FIG. FIG. 3 is a side cross-sectional view showing a state in which a recording/reproducing operation is being performed on a flexible recording medium disk, and FIG. A perspective view of the cartridge (a part of the container is crushed to show the internal state), Figure 4 is a schematic diagram showing the configuration of the liner, and Figures 5 and 6 show a flexible magnetic disk. FIG. 7 is a side sectional view of a conventional device that rotates at high speed in a space spaced apart from a substrate with good flatness by a constant distance, and FIG. 7 is a perspective view of a spacer. 1... Substrate with good flatness, 2... Flexible magnetic disk (for example, floppy disk), 3...
Rotating shaft, 4... turntable, 5... clamper,
6...Magnetic head, 7...Air intake port, 8...
Spacer, 9...Substrate having a reference plane larger than the flexible recording medium disk being rotated and having a through hole 10 in the center, 11...Good plane Fan-shaped air bearing plate with characteristics 1.1
2... Thin liner made of nonwoven fabric, f... Fiber, 13
. . . Base plate of recording/reproducing device, 14 . . . Drive motor, 1
5...Turntable, 16...Clamper, 17.
. . . Flexible recording medium disk, 18 . . . Recording/reproducing element (magnetic head), 19 . . . Pressing point for applying a predetermined pressing force from arm 20 to magnetic head 18, 21 . A magnetic head 18 is connected to a flexible recording medium disk 1.
a transport mechanism for moving and displacing the flexible recording medium disk 17 in the radial direction within the movement area of the recording/reproducing element in 7;
1... Transfer mechanism, 22... Cartridge container, Patent applicant: Victor Japan Co., Ltd.

Claims (1)

[Claims] 1. A substrate having a reference plane larger than the flexible recording medium disk to be rotated and having a through hole in the center; In the annular region including the movement range of the recording/reproducing element, a fan-shaped air bearing plate having a surface exhibiting good flatness is placed on the substrate in the fan-shaped part including the movement range of the recording/reproducing element. In addition, a thin nonwoven fabric is provided on the substrate in the annular region except for the fan-shaped air bearing plate, with the upper part of the constituent fibers reaching near the surface of the air bearing plate. The stable rotation device 2 for a flexible recording medium disk provided with a liner, the flexible recording medium disk according to claim 1, wherein an air bearing plate having a carbon coating applied to the surface thereof is used as the air bearing plate. The stable rotation device 3 for a flexible recording medium disk according to claim 1, wherein the outer periphery of the air bearing plate and the outer periphery of the liner protrude beyond the outer periphery of the recording medium disk.