JPH02172080A - Cartridge for flexible recording medium disk - Google Patents

Abstract

PURPOSE:To form an excellent air bearing and to prevent adhesion of dust by providing a required liner to a 2-split cartridge and base clipped with the cartridge whose inner circumference is not in contact with a hub with excellent flatness respectively. CONSTITUTION:The inner circumferential face of a base 19 with excellent flatness provided with thin unwoven cloth made liners 22, 23 to both sides while being clipped with the 2 division cartridges 8, 9 is not in contact with a hub 11 and excellent air bearing is formed with the air flowing between flexible recording media 13, 14 rotating at a high speed via vent holes 15a, 16a of the hub 11 and, a gap among the base 19 and the hub 11, and the media 13, 14 are floated and supported. The dust is absorbed with the liners 22, 24 and the similar liners 33, 23 of the cartridges 8, 9 and the hindrance due to adhesion of dust is prevented.

Description

[Detailed description of the invention] (Industrial application field) FIELD OF THE INVENTION The present invention relates to a flexible recording medium disk cartridge.

(Prior Art) In recent years, high-density recording and reproducing of information signals has become necessary in various technical fields5, such as magnetic recording and reproducing systems, optical recording and reproducing systems, and magneto-optical recording and reproducing systems.

Of course, various other well-known recording and reproducing methods have been used to achieve this, and recently, the application of electromagnetic waves, electric fields, and electric currents has become more popular.

Phase change from amorphous state to crystalline state due to heating etc.
Also, recording media whose recording layer is made of a material that undergoes a phase change from a crystalline state to a non-crystalline state are attracting attention because of the possibility of rewritability. Research into the practical application of high-density recording and reproducing methods for information signals has become active.

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 conventional magnetic recording and reproducing system, various configurations such as tape-shaped ones, sheet-shaped ones, disc-shaped ones, etc. are known. 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 disk is manufactured after the surface of the base disk is polished with high precision.

Because it is manufactured by forming a recording layer of magnetic material using methods such as plating or vapor deposition, it is expensive, so flexible magnetic disks (such as floppy disks) are used in equipment that requires low cost. It is well known that this is the case.

Incidentally, flexible magnetic disks (for example, floppy disks) have generally been used by rotating them at low speed inside a container.

In recent years, many proposals have been made to increase the speed and reliability of flexible magnetic disks (e.g. floppy disks). ) is also disclosed in JP-A-63-23264, in which a flexible recording medium disk cartridge is rotated at high speed in a space spaced apart from a flat substrate with good flatness in a container at high speed. .

The flexible recording medium disk cartridge disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 63-23264 is the fifth
As illustrated in the figure, a first flexible recording medium disk 2 rotates at high speed in close proximity to a flat plate 1 with good flatness, and a first flexible recording medium disk 2 adjacent to the first flexible recording medium disk 1. The second flexible recording medium disk 3 is configured to rotate at high speed. In FIG. 5, numeral 4 indicates a hub 55, and a cartridge case.

(Problems to be Solved by the Invention) By the way, in the previously proposed flexible recording medium disk cartridge, the first flexible recording medium disk 2 is placed close to the flat plate 1 having good flatness and is moved at high speed. Due to the air bearing effect in the gap g between the flat plate 1, which has good flatness due to rotation, the contact between the first flexible recording medium disk 2 and the magnetic head can be made good. .

However, the flexible recording medium disk used in the previously proposed flexible recording medium disk cartridge has poor flatness and is prone to surface wobbling. By rotating at high speed in close proximity to the flat plate 1 with good flatness, an approximately constant distance between the flat plate 1 with good flatness and the flat plate 1 due to the air bearing effect of mg between the flat plate 1 with good flatness The first flexible recording medium disk 2, which is rotating while maintaining the rotational angle, still has surface warpage and surface wobbling.

Therefore, the second flexible recording medium disk 2 is placed close to the first flexible recording medium disk 2 and is rotating at high speed on an air bearing formed in a gap with the first flexible recording medium disk 2. In the flexible recording medium disk 3.

The state of contact with the magnetic head on the second flexible recording medium disk 3 is now affected by the warping and surface wobbling of the surface remaining on the first flexible recording medium disk 2. Therefore, in this previously proposed flexible recording medium disk cartridge, it is necessary to use a flexible recording medium disk with good flatness.

FIG. 6 shows a state in which a magnetic head 6.7 is in contact with two flexible recording medium disks 2 and 3 in the previously proposed flexible recording medium disk cartridge shown in FIG. FIG.

By the way, in order to greatly improve the surface runout of a flexible recording medium disk using the air bearing effect.

It is necessary to make the gap between the flat plate with good flatness and the flexible recording medium disk narrow, but the gap between the flat plate with good flatness and the flexible recording medium disk is narrow. If the size of the gap is narrowed, the flexible recording medium disk will be destroyed when dust enters the gap. There are limits of its own.

Therefore, in the cartridge of the flexible recording medium disk proposed by Mourning, a one-wipe tool should be inserted into the gap between the flat plate with good flatness and the flexible recording medium disk to remove the dust that has entered the gap. However, removing dust that has entered the gap in this way is only an auxiliary measure, and it is necessary to prevent dust from entering the gap between the flat plate with good flatness and the flexible recording medium disk. It is important to ensure that the recording medium is flexible, and in this respect, there are problems with the previously proposed flexible recording medium disk cartridges.

(Means for Solving the Problems) The present invention provides a flexible recording medium disc in which the inner circumferential portions of two flexible recording medium disks each having a ventilation hole near the inner circumference are attached to a hub at a predetermined interval. In the flexible recording medium disk assembly, the outer circumferential portion is sandwiched between two flexible recording medium disks by the joining portion of the storage container that is divided into two, and the inner circumferential portion is not in contact with the hub. A cartridge for a flexible recording medium disk, comprising: a substrate having a reference flat surface in the state of and a flexible recording medium disk assembly in which the inner peripheral portions of two flexible recording medium disks each having a ventilation hole near the inner periphery are attached to a hub with a predetermined interval between them. A reference plane is provided between the flexible recording medium disks, the outer circumference of which is sandwiched between the joints of the storage containers that are divided into two, and the inner circumference of which is not in contact with the hub. The substrate is arranged, and in the annular region including the moving range of the recording/reproducing element on both sides of the substrate, the fan-shaped portion including the moving range of the recording/reproducing element has good flatness. A fan-shaped air bearing plate having a surface is provided on both sides of the substrate, and the upper part of the constituent fibers is provided on the substrate in the annular region on both sides of the substrate except for the part of the fan-shaped air bearing plate. A thin liner made of non-woven fabric is provided that reaches near the surface of the air bearing plate, and the liner is provided in the portion of the storage container facing the flexible recording medium disk. It provides cartridges.

(Function) Two flexible recording medium disks in a flexible recording medium disk assembly in which the inner circumferential portions of two flexible recording medium disks each having a ventilation hole near the inner circumference are attached to a hub with a predetermined interval apart. A reference plane in which the outer periphery is sandwiched between the flexible recording medium disks by the joining part of the storage container that is divided into two, and the inner periphery is in a state where it is not in contact with the hub. When the above-mentioned hub was rotated at high speed, the two flexible recording medium disks came into contact with the above-mentioned substrate and the liner provided in the portion of the storage container facing the flexible recording medium disks. rotates at high speed.

In addition, in a flexible recording medium disk assembly in which the inner peripheral portions of two flexible recording medium disks each having a ventilation hole near the inner periphery are attached to a hub with a predetermined interval apart, A reference plane is placed between the flexible recording medium disks, the outer circumference of which is sandwiched between the joints of the two divided storage containers, and the inner circumference of which is not in contact with the hub. A substrate having the above-mentioned structure is disposed, and in an annular region including the movement range of the recording/reading element on both sides of the substrate, a fan-shaped portion including the moving range of the recording/reading element has good flatness. A fan-shaped air bearing plate having a surface shown in FIG. A thin liner made of non-woven fabric is provided that reaches near the surface of the air bearing plate described above.

A liner is provided in the portion of the storage container facing the flexible recording medium disk, and when the flexible recording medium disk is rotated at high speed above the air bearing plate and the liner, suction is drawn from the center of the substrate. The air passes through the gap between the substrate and the flexible recording medium disk from the inner circumferential side of the flexible recording medium disk to the outer circumferential side of the flexible recording medium disk.

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 The flexible recording medium disk of the part is placed in a position parallel to the air bearing plate at a predetermined minute distance from the air bearing plate, and the air passing through the liner part forms the liner. The dust contained in the air is captured by the fibers as they pass through the gaps between the fibers, causing the dust to enter the tiny gap between the air bearing plate and the flexible recording medium disk. Also, by bringing the upper part of the ms constituting the liner into contact with the flexible recording medium disk, dust is removed from the flexible recording medium disk and the air bearing plate and the flexible disk are removed. To prevent dust from entering a minute gap between a flexible recording medium disk and to prevent electrostatic charge from being charged to the flexible recording medium disk.

(Example) Hereinafter, specific contents of the flexible recording medium disk cartridge of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a flexible recording medium disk cartridge of the present invention, FIG. 2 is a side sectional view of the air bearing plate portion of the flexible recording medium disk cartridge of the present invention, and FIG. 3 is a main body of the present invention. FIG. 4 is a side sectional view of a portion other than the air bearing plate portion of the flexible recording medium disk cartridge of the present invention, and FIG. 4 is a side view of a magnetic recording and reproducing apparatus using the flexible recording medium disk cartridge of the present invention. It is.

In FIG. 1, reference numerals 8 and 9 indicate each half of the storage container (cartridge case), and 8a and 9a indicate recording and reproducing elements (magnetic heads) in the radial direction of the two flexible recording medium disks inside the storage container. These are openings provided in each half 8.9 of the storage container so that it can be moved, and 10 is a hole into which the drive hub 11a at the lower end of the hub 11 can be fitted loosely.

11b is a hole into which a bottle provided on the hub stand of the spindle motor fits, and llc is a screw hole into which the screw 12 is screwed. 13.14 is a flexible recording medium disk body;
For example, a sheet made of a high-molecular organic material with a magnetic material film adhered to the surface, or an extremely thin carbon film coated on the magnetic material film may be used.

Reference numeral 15.16 denotes a flexible thin plate that is connected and fixed to the inner periphery of the flexible recording medium disk body 13.14, and this flexible thin plate 15.16 includes:
A plurality of ventilation holes 15a, 15a... 16a, 16a.
... has been drilled.

The flexible thin plate 15.16 described above is composed of a stainless steel thin plate having a thickness of about 25 microns, for example, and the flexible thin plate 15.16 has a plurality of flexible thin plates 15.16 as described above. The ventilation holes 15a, 15a...
By providing holes 16a, 16a, etc., it exhibits good flexibility.

17 is an intermediate ring that fits on the outer periphery of the cylindrical portion lid at the center of the hub 11, and 19 is a substrate with good flatness, and this substrate 19 with good flatness has both sides thereof. Each of the reference planes is made of a thin plate of stainless steel, which is extremely thin and several times the thickness of the flexible recording medium disk 13, 14. .

The substrate 19 described above is a storage container divided into two parts,
That is, the outer periphery is sandwiched between the joints of the respective halves 8 and 9 of the storage container, and the inner periphery formed by the hole 10 provided in the center is out of contact with the hub 11. It is set up like this.

A fan-shaped air bearing plate 20 or 35 having good flatness is provided on the side surface of the substrate 19, respectively.
A ring-shaped area is constituted by the book liner 22 or 34 made of non-woven fabric.

FIG. 1 shows a state in which a continuous annular region is formed on one surface of the substrate 19 by both a fan-shaped air bearing plate 20 and a thin liner 22 made of nonwoven fabric. has been done.

On the other side of the substrate 19 are the fan-shaped air bearing plate 20 and a thin liner 22 made of non-woven fabric.
Similarly to the continuous annular region formed by both the m-shaped air bearing plate 35 and the thin liner 34 made of non-woven fabric, a continuous annular region is formed by both the m-shaped air bearing plate 35 and the thin liner 34 made of non-woven fabric.

The fan-shaped air bearing plate 2035 described above is provided at a position that includes the movement range of the recording/reproducing element (magnetic head) 31, 32 (FIG. 4).

Further, as the liners 22 and 34, thin nonwoven fabrics are used in which the upper portions of the fibers forming the liners reach near the surface of the air bearing plate.

An annular region formed on one surface of the substrate 19 by both the fan-shaped air bearing plate 20 and the liner 22 described above, and a circular region formed on one surface of the substrate 19 by both the fan-shaped air bearing plate 35 and the liner 34 described above. The annular area formed on the other surface of the annular area is defined as an annular area having a size such that its outer periphery protrudes outward from the outer periphery of the flexible recording medium 13 and 14. It is considered a thing.

The air bearing plate 20.35 described above is.

Each thin plate 1 of a metal material, for example, has a thickness of 100 to 150 mm.
After mirror-polishing the surface of a thin micron stainless steel plate, a thin film of carbon is applied to the surface by sputtering or diffusion, and then processed into a predetermined fan shape by etching, for example. Can be done. An inclined surface (introduction surface) for smoothly introducing air into the upper surface of the air bearing plate 20.35 is formed on the side surface of the air bearing plate 20.35 facing the air flow.

The bearing plate 20.35 has a mirror-like surface with no scratches and good flatness, and also does not produce any cracks during molding, and the mirror-like surface is coated with hard carbon. Because WtIII is coated, there is no possibility of scratches caused by dust during use, and the dust attached to the scratches will gradually grow and disturb the stable rotation of the flexible recording medium disk. have

Storage container (cartridge case) shown in Figure 1
The inner surfaces of each half 8, 9 are provided with a liner 33,
23 (see FIGS. 2 and 3 for the liner 33 attached to the inner surface of the container half 8).

The components of the flexible recording medium disk cartridge of the present invention shown in the exploded perspective view of FIG. 1 are assembled into a flexible recording medium disk cartridge, for example, in the following manner. That is, the flexible recording medium disk body 1
A flexible thin plate 15 is connected and fixed to the inner circumference of 3.
Fitting the hole in the center of the cylindrical part lid in the hub 11,
Next, after fitting the intermediate ring 17 to the cylindrical portion lid of the hub 11, the substrate 19 is fitted to the cylindrical portion lid of the hub 11.
The central hole 21 of the hub 11 is loosely fitted into the central hole 21 of the flexible thin plate 16 which is connected and fixed to the inner periphery of the flexible recording medium disk body 14. After fitting the part Lid and placing the inner circumferential part on the intermediate ring, place the retaining metal fitting 18 from above, and screw the screw 12 into the threaded hole 11c of the cylindrical part lid to remove the holding metal fitting 18. is fixed to the cylindrical portion lid of the hub 11, two flexible recording medium disks 13 and 14 are fixed to the hub 11, and two flexible recording medium disks 1 are fixed to the hub 11.
3. Between 14 and 14, the center hole of the board 19 is connected to the cylindrical part lid of the hub.
The intermediate parts loosely fitted are assembled.

The intermediate component assembled in the above manner is assembled into a flexible recording medium disk by sandwiching the outer periphery of the substrate 19 between the joints of the two halves 8 and 9 of the two storage containers (cartridge cases). The cartridge C (FIG. 4) is made.

The configuration of the flexible recording medium disk cartridge of the present invention assembled as described with reference to FIG. 1 is as follows:
It can be easily understood by referring to FIGS. 2 and 3. FIG. Openings 8 provided in each half 8, 9 of the storage container
FIG. 3 is a longitudinal cross-sectional view of portions a and 9a, and FIG.
, 9a is a longitudinal cross-sectional view of a portion different from the portion 9a.

FIG. 2 above shows a state in which the visible recording medium disks 13 and 14 correspond to fan-shaped air bearing plates 20 and 35 provided on the substrate 19.
In addition, in FIG. 3, flexible recording media *13, 14 are provided on the substrate 19, and thin liners 22, 3 made of non-woven fabric are provided.
The state corresponding to part 4 is shown.

FIG. 4 is a side view (partially a partial view) of the recording and reproducing apparatus showing a state in which recording and reproducing are performed using the flexible recording medium disk cartridge of the present invention. In the figure, 24 is a machine base of the recording/reproducing device, 25 is a spindle motor, 26 is a rotating shaft, 27 is a hub stand of the spindle motor,
28 is a transfer mechanism for moving and displacing the magnetic head 31.32 in the radial direction of the flexible recording medium disk 13.14 within its movement area; 29.30 is an arm to which the magnetic head 31.32 is attached; Also, C is the overall code of the cartridge of the flexible recording medium disk.

In FIG. 4, when the two flexible recording medium disks 13 and 14 in the storage container are rotated by the rotation of the spindle motor 25 at a predetermined rotation speed 1, for example, 1800 rPm to 3600 rpm, the flexible recording medium disks 13 Rotates at high speed above an annular area formed by a fan-shaped air bearing plate 20 on a substrate 19 and a thin liner 22 made of non-woven fabric,
Further, the flexible recording medium disk 14 rotates at high speed above an annular area formed by a fan-shaped air bearing plate 35 on the substrate 19 and a thin liner 34 made of nonwoven fabric.

Next, with reference to FIGS. 2 and 3, the operation of the air bearing plate 20.35 and the thin liners 22, 34 made of non-woven fabric when the flexible recording medium disk 13.14 rotates at high speed will be described.

As mentioned above, the flexible recording medium disk 13.14 is connected to the air bearing plate 20.35 and the thin liner 2 made of non-woven fabric.
While rotating at high speed over areas 2 and 34, the plurality of ventilation holes 16a of the flexible thin plate 16 described above,
16a... flexes the gap between the annular area formed by the fan-shaped air bearing plate 20 on the substrate 19 and the thin liner 22 made of nonwoven fabric and the flexible recording medium disk 14. The airflow flows as a thin layer from the inner circumference to the outer circumference of the recording medium disk 14, and also through the holes 1 described above.
0 and a plurality of ventilation holes 15a, 1 of the thin plate 15 having flexibility.
5a... flexes the gap between the flexible recording medium disc 13 and the annular area formed by the fan-shaped air bearing plate 35 on the substrate 19 and the thin liner 34 made of non-woven fabric. The air flows as a thin layer of air from the inner circumference to the outer circumference of the recording medium disk 13. Note that by changing the size and number of the ventilation holes 15a and 16a, the amount of the thin layer air flow (thickness of the air layer) can be adjusted.

The thickness of the air layer in the gap between the surface of the fan-shaped air bearing plate 20 on the substrate 19 and the flexible recording medium disk 14, and the thickness of the air layer in the gap between the surface of the fan-shaped air bearing plate 35 on the substrate 19 and the flexible The thickness of the air layer in the gap between the recording medium disk 13 and the flexible recording medium disk 14.13
The center support height of the flexible recording medium disk 14.13
The predetermined thickness is determined depending on the rotational speed of the fan-shaped air bearing plate 20 on the substrate 19 and the gap between the surface of the fan-shaped air bearing plate 20 on the substrate 19 and the flexible recording medium disk 14, and the fan-shaped air bearing plate on the substrate 19. It is a desirable embodiment that the dimensions of the gap between the surface of the bearing plate 35 and the flexible recording medium disc 13 are the same.

Also, a fan-shaped air bearing plate 2 on the substrate 19
In the part of the liner 22 provided in the part other than 0 and the part of the liner 34 provided in the part other than the fan-shaped air bearing plate 35 on the substrate 19, from the inner periphery of the flexible recording medium disk 14. The laminar airflow flowing towards the outer station flows through the interstices of the fibers making up the liner 22, and
A thin air flow flowing from the inner circumference to the outer circumference of the flexible recording medium disk 13 flows through the gaps between the fibers forming the liner 34 .

A thin layer having a predetermined thickness (for example, about 80 microns to 150 microns when a flexible recording medium disk having a diameter of 86 mm is being rotated at 24 Q rpm) is placed on the air bearing plate 20 (or 35). A flexible recording medium disk 14 (
When the magnetic head 31 (or 32) to which a predetermined pressing force is applied by a spring is brought into contact with the arm 29 (or 30) via the pressing point, the magnetic head 31 (or 32) The flexible recording medium disk 14 (or 13) sinks in the part where it comes into contact with the air bearing plate 20 (or 35), and the thickness of the thin air flow on the air bearing plate 20 (or 35) in that part is the same as that in other parts. It will be thinner than the thickness of the laminar airflow on plate 20 (or 35).

Air bearing plate 20 (or 35
) The shape of the flexible recording medium disk 14 (or 13) rotating with a thin air flow of a predetermined thickness interposed thereon is that of the air bearing plate 20 (or 35) as is well known. Since the shape is similar to the surface shape, if the air bearing plate 20 (or 35) with good flatness is used, the flexibility corresponding to the part of the air bearing plate 20 (or 35) Recording medium disk 1
The shape of 4 (or 13) is also the air bearing plate 20
(or 35) exhibits good flatness due to the air bearing effect caused by the thin layer of airflow on the disk, and deformation due to surface runout of the flexible recording medium disk 14 (or 13) ranges from a few minutes to several tens of minutes. It can be improved to about one-fold.

In addition, the flexible recording medium disk 14 (or 13) in the air bearing plate 20 (or 35) has good flatness.
), the magnetic head 31 (or 32
) is located, the state of the dent in the flexible recording medium disc 14 (or 13) caused by the magnetic head 31 (or 32) will be approximately the same.

The degree of improvement in the deformation of the flexible recording medium disk 14 (or 13) obtained by the air bearing effect described above depends on the thickness of the thin air flow formed on the air bearing plate 20 (or 35). The thinner the disk, the larger the size, but if the distance between the flexible recording medium disk 14 (or 13) and the surface of the air bearing plate 20 (or 35) is reduced, dust contained in the air will be removed from the flexible recording medium. Disk 14
(or 13) and the surface of the air bearing plate 20 (or 35), and moves slowly while being stuck between the air bearing plate 20 (or 35) and the air bearing plate 20 (or 35). When the dust reaches the surface, the dust bites into the very slight scratches and dents and settles there, and the settled dust attracts other dust one after another and gradually becomes larger. Concentric scratches were generated on the surface of 14 (or 13).

This may cause the flexible recording medium disk 14 (or 13) to break.

To prevent such problems from occurring.

The distance between the flexible recording medium disc 14 (or 13) and the surface of the air bearing plate 20 (or 35) may be increased, but if such a solution is taken,
The degree of improvement in the deformation of the flexible recording medium disk 14 (or 13) due to the air bearing effect is reduced, and the magnetic head 31 (or 32) and the flexible recording medium disk 14 are
(or 13) becomes unstable, and good recording and reproducing operations cannot be performed.

Next, when the flexible recording medium disk 14 (or 13) is rotated at high speed in the air, the flexible recording medium disk 14
The flexible recording medium disk 14 (or 13) is charged by the friction between the disk (or 13) and the air.

The flexible recording medium disk 14 (or 13) is attached to the air bearing due to the electrostatic attraction force generated between the electrostatic charge generated on the flexible recording medium disk 14 (or 13) and the air bearing plate 20 (or 35). Plate 20 (or 35
), and the rotation of the flexible recording medium disk 14 (or 13) may suddenly stop, but at this time, the flexible recording medium disk 14 (or 13) may become combed or combed due to inertial force. It will get damaged.

Furthermore, when the stopped flexible recording medium disk 14 (or 13) starts rotating, the stopped flexible recording medium disk 14 (or 13) is electrostatically charged to the air bearing plate 20 ( or 35), when the flexible recording medium disk 14 (or 13) starts rotating, the flexible recording medium disk 14 (or 13) will become combed and damaged. things happen.

The adhesion phenomenon due to the electrostatic attractive force caused by the electrostatic charging described above depends on the polarity of the electrostatic charge generated on the flexible recording medium disc 14 (or 13) and the polarity of the electrostatic charge generated on the air bearing plate 20 (or 35). It appears significantly when the values 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, so the flexible recording medium disc 14 (or 13) and air bearing plate 20 (or 35) are It is important that constituent materials be selected that are unlikely to cause adhesion due to electrostatic attraction.

However, in the flexible recording medium disk cartridge of the present invention, the fan-shaped air bearing plate 20 on the substrate 19
The liner 22 provided in the part excluding (or 35)
(or 34) in the flexible recording medium disk 14
(or 13) is flowing from the inner periphery to the outer periphery of the liner 22 (or 34), and the dust contained in the air is removed from the liner 22 (or 34). (or 34), and the upper part of the fibers forming the liner 22 (or 34) contacts the surface of the flexible recording medium disk 14 (or 13) and becomes flexible. Sex recording medium disk 14 (or 13)
The above-mentioned problems do not occur in the present invention because the present invention removes dust adhering to the flexible recording medium disk 14 (or 13) and prevents electrostatic charges from accumulating on the flexible recording medium disk 14 (or 13).

That is, the liner 22 (or 34) is made of a nonwoven fabric, which is constructed by fixing (for example, ultrasonic welding) a large number of fibers to each other in places. .

The flow of air between the large number of fibers used in its construction also creates some air bearing effect on the liner 22 (or 34) and causes the upper portion of said fibers to rotate at high speed. Since the surface of the flexible recording medium disc 14 (or 13) can be brought into contact with the surface of the flexible recording medium disk 14 (or 13) with an extremely small contact pressure, dust can be removed as described above and static electricity generation can be prevented. You can make it so that there is no such thing.

The liners 22, 34, 23, and 33 should be made of fibers that have high mechanical strength, are resistant to friction, and will not break and generate dust. It is constructed of a material that allows air flow to easily pass between the fibers, and that does not generate large static electricity due to friction with the flexible recording medium disk 14 (or 13). A material made of selected fibers is used. It is desirable that the above-mentioned materials have some degree of conductivity. Also, a liner 2 provided inside each half 8, 9 of the storage container
3, 33, leave a part of it slightly inflated,
It is a preferred embodiment to ensure that the liners 23, 33 are in contact with the flexible recording medium disk 14.13 during each rotation of the flexible recording medium disk 14.13.

In addition, the flexible recording medium disc 14.13 and the storage containers 8, 9
The distance from the inner surface of the flexible recording medium disk 14.
．． The distance between the flexible recording medium disk 14.13 and the air bearing plate 20.35 is greater than the distance between the flexible recording medium disk 14.13 and the air bearing plate 20.35 to prevent the air bearing effect from occurring between the flexible recording medium disk 14.13 and the air bearing plate 20. Avoid the influence of negative pressure generated between the disk 14, 13 and the inner surface of the storage container 8.9.

By the way, the air bearing plate 20.35 mentioned above
A predetermined thickness (for example, when a flexible recording medium disk with a diameter of 86 mm is rotated at 240 rpm,
A flexible recording medium disk 13.1 rotating with a thin layer of air (about 0 microns to 150 microns) interposed therebetween.
4 is not completely parallel to the substrate 19.

That is, the flexible recording medium disk 14 is connected to the substrate 19 in the fan-shaped air bearing plate 20 portion thereof.
A thin liner 2 made of non-woven fabric is parallel to the
In the part corresponding to 2.

The flexible recording medium disk 13 rotates in a state closer to the substrate 19 than the height of the fan-shaped air bearing plate 35 mentioned above. , it is parallel to the substrate 19, but the portion corresponding to the thin liner 34 made of non-woven fabric rotates in a state closer to the substrate 19 than the height of the fan-shaped air bearing plate 20 described above. It turns out.

As described above, since the fan-shaped air bearing plate 20 (or 35) is configured to have sufficiently good flatness, the flexible recording medium disk 14 (or 13) shows sufficiently good flatness due to the good air bearing effect on the fan-shaped air bearing plate 20 (or 35), and a stainless steel plate with a thickness of 150 microns is used as the substrate 19. , and air bearing plate 20
(35) is a stainless steel plate with a thickness of 150 microns, the distance between the two flexible thin plates 15 and 16 is 660 microns, and the air bearing plate 20 (35) and the flexible recording medium disk 14.13 is 80 microns, and the height to the top of the fibers in the liners 22, 34 is 230 microns, as a result of experiments, a flexible recording medium disk with a thickness of 75 microns and a diameter of 86 mm. When 14 (or 13) is rotated at 240 rpm, the surface runout is reduced by about 2 compared to the conventional device.
It was found that an improvement of 0 dB could be obtained.

In FIG. 4, the magnetic head 31.3 is transported in the radial direction of the flexible recording medium disk 14.13 by the transport mechanism 28.
2 is a flexible recording medium disk at a position corresponding to approximately the center of the fan-shaped air bearing plate 20.35 while a predetermined pressing force is applied from the arm 29.30 through the pressing point. 14.13 in the radial direction to reach the position of a predetermined recording trace (track).

As mentioned above, the fan-shaped air bearing plate 20.3
If a thin carbon film (for example, 1000 angstroms thick) is used on a thin stainless steel plate with a thickness of 150 microns as 5, the surface of the soft stainless steel material will be covered with a hard carbon film. This prevents the surface of the air bearing plate 20.35 from being damaged by dust, and since the carbon film itself is difficult for dust to adhere to, and has excellent removability of adhered dust, the fan-shaped Air bearing plate 20.3
Even if dust enters the gap between the recording medium disk 5 and the flexible recording medium disk 14, 13, the dust will not grow there.

Further, dust is removed from the liner 22 provided on the substrate 19,
34 and the liners 33, 23 provided on the inner surface of each half 8.9 of the storage container, the gap between the fan-shaped air bearing plate 20 and the flexible recording medium disk 14, Although it is rare for dust to enter the gap between the fan-shaped air bearing plate 35 and the flexible recording medium disc 13 or the space into which the magnetic heads 31 and 32 are inserted, the fan-shaped air bearing plate 20 As mentioned above, even if dust enters the gap between the air bearing plate 20 (or 35) and the flexible recording medium disk 14 (or 13), the dust will not grow there. or 35), the gap between the fan-shaped air bearing plate 20 (or 35) and the flexible recording medium disc 14 (or 13) is made sufficiently small so that the magnetic head 31 To reduce the amount of depression of the surface of the flexible recording medium disk 14 (or 13) when the magnetic head 31 (or 32) is in contact with the flexible recording medium disk 14 (or 13), This allows good contact with the flexible recording medium disk 14 (or 13) at any portion in the radial direction of the flexible recording medium disk 14 (or 13).

(Effects of the Invention) The present invention provides a flexible recording medium disk in which the inner peripheral portions of two flexible recording medium disks each having a ventilation hole near the inner periphery are attached to a hub at a predetermined interval. Between the two flexible recording medium disks in the assembly, the outer circumferential portion is fixed by the joint portion of the storage container that is divided into two, and the inner circumferential portion is kept out of contact with the hub. A cartridge for a flexible recording medium disk, in which a substrate having a reference plane is disposed, and a liner is provided in the portion of the substrate and storage container facing the flexible recording medium disk, and the vicinity of the inner periphery. Two flexible recording media in a flexible recording medium disk assembly comprising two flexible recording medium disks each having a ventilation hole and attached to a hub at a predetermined distance from each other. A substrate having a reference flat surface whose outer circumferential portion is sandwiched between the joining parts of the storage container which is divided into two and whose inner circumferential portion is in a non-contact state with the hub is arranged between the disks. In the annular region including the moving range of the recording/reproducing element on both sides of the substrate, a fan-shaped portion including the moving range of the recording/reproducing element has a surface exhibiting good flatness. Shaped air bearing plates are provided on both sides of the substrate, and the upper part of the constituent fibers is provided on the substrate in the annular region on both sides of the substrate except for the fan-shaped air bearing plate part. A thin liner made of non-woven fabric is provided that reaches near the surface of the surface.

The flexible recording medium disk cartridge of the present invention has a liner provided in the portion of the storage container facing the flexible recording medium disk, and the flexible recording medium disk cartridge of the present invention has a liner provided near the inner periphery. Two flexible recording medium disks in a flexible recording medium disk assembly in which the inner peripheral portions of two flexible recording medium disks provided with ventilation holes are attached to a hub with a predetermined interval apart. A substrate having a reference plane whose outer circumferential portion is sandwiched between the connecting portions of the storage container divided into two and whose inner circumferential portion is not in contact with the hub is placed between them; When the hub is rotated at high speed, the two flexible recording medium disks are in contact with the liner provided in the portion of the substrate and storage container facing the flexible recording medium disks, and the hub is rotated at high speed. In addition, in a flexible recording medium disk assembly in which the inner peripheral portions of two flexible recording medium disks each having a ventilation hole near the inner periphery are attached to a hub with a predetermined interval apart, A reference plane is placed between the flexible recording medium disks, the outer circumference of which is sandwiched between the joints of the two divided storage containers, and the inner circumference of which is not in contact with the hub. A substrate having the above-mentioned structure is disposed, and in an annular region including the movement range of the recording/reading element on both sides of the substrate, a fan-shaped portion including the moving range of the recording/reading element has good flatness. A fan-shaped air bearing plate having a surface shown in FIG. A thin liner made of non-woven fabric that reaches near the surface of the air bearing plate described above is provided, and a liner is provided in the portion of the storage container facing the flexible recording medium disc, so that the air bearing plate described above and When the flexible recording medium disk is rotated at high speed above the liner, air sucked in from the center of the substrate fills the gap between the substrate and the flexible recording medium disk to the inner periphery of the flexible recording medium disk. Among the air that is sucked in from the center of the board and passes through the annular area described above, the air that passes over the air bearing plate is placed on the air bearing plate. A thin layer of air is formed to position the flexible recording medium disk in that area at a predetermined minute distance from the air bearing plate and parallel to the air bearing plate. 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 and flexible recording medium disk to In addition, the upper part of the fibers that make up the liner is in contact with the flexible recording medium disk, so that dust is prevented from entering the flexible recording medium disk. This prevents dust from entering the minute gap between the air bearing plate and the flexible recording medium disk, and also prevents static charges from being accumulated on the flexible recording medium disk. The substrate that regulates the flatness of the flexible recording medium disk that is rotating at high speed inside the storage container is fixed with an extremely thin material that is sandwiched between the joints of each half of the cartridge storage container. In addition to being able to construct the cartridge as a thin one,
Since the board does not rotate, the load on the spindle motor can be reduced.

In addition, since the structure is such that separate flexible recording medium disks are rotated on both sides of a single substrate, assembly is easy and long-term stability is achieved. The influence of the magnetic head pressed against the medium disk is not exerted on the other flexible recording medium disk, and furthermore, a flexible thin plate is provided between the hub and the inner peripheral part of the flexible recording medium disk. By providing this, the flexibility of the inner circumferential portion of the flexible recording medium disk is increased, and the inner circumferential portion of the flexible recording medium disk can also be used. In addition, since the magnetic film of a flexible recording medium disk is substantially formed only on one side, it is easy to select the material of the flexible film and the material of the magnetic film. A flexible recording medium disk equipped with a magnetic film having high magnetic properties and capable of high-density recording and reproduction can be easily manufactured.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a flexible recording medium disk cartridge of the present invention, FIG. 2 is a side sectional view of the air bearing plate portion of the flexible recording medium disk cartridge of the present invention, and FIG. 3 is a main body of the present invention. FIG. 4 is a side sectional view of a portion other than the air bearing plate portion of the flexible recording medium disk cartridge of the present invention, and FIG. 4 is a side view of a magnetic recording and reproducing apparatus using the flexible recording medium disk cartridge of the present invention. , 5 and 6 are side sectional views of a part of a conventional example of a cartridge for a flexible recording medium disk. DESCRIPTION OF SYMBOLS 1... Flat plate with good flatness, 2... First flexible recording medium disk, 3... Second flexible recording medium disk, 4...
...Hub, 5...Cartridge case, 6,7...
・Magnetic head, 8, 9... Each half of the storage container (cartridge case), 8a, 9a... A recording/reproducing element (magnetic head) in the radial direction of the two flexible recording medium disks inside the storage container. openings provided in each half hole 8.9 of the storage container so that the housing can be moved; A hole into which the provided pin fits, li
e...screw hole into which the screw 12 is screwed, 13, 14...
Flexible recording medium disk body (flexible recording medium disk), 15.16... A flexible disk that is connected and fixed to the inner periphery of the above-mentioned flexible recording medium disk body 13. Thin plates 15a, 16a... ventilation holes, 17...
- An intermediate ring that fits on the outer periphery of the cylindrical portion lid at the center of the hub 11, 18... a holding fitting, 19... a substrate with good flatness. 20.35...Fan-shaped air bearing plate, 2
4... Recording and reproducing device base, 25... Spindle motor, 26... Rotating shaft, 27... Spindle motor hub stand, 28... Magnetic head 31, 32 within its movement area. a transfer mechanism for moving and displacing the flexible recording medium disks 13 and 14 in the radial direction; 29.30... an arm to which the magnetic heads 31 and 32 are attached; 31.32...Magnetic head, 22, 23, 33, 34
...Thin liner made of non-woven fabric, C...Flexible recording medium disk cartridge overall code, ゛(ji')

Claims (1)

[Claims] 1. A flexible recording medium disk formed by attaching the inner peripheral portions of two flexible recording medium disks each having a ventilation hole near the inner periphery to a hub with a predetermined interval apart. The outer periphery is sandwiched between two flexible recording medium disks in the assembly by the joint of the storage container that is divided into two, and the inner periphery is made out of contact with the hub. A cartridge 2 of a flexible recording medium disk, in which a substrate having a reference flat surface is disposed, and a liner is provided on the portion of the substrate and storage container facing the flexible recording medium disk, near the inner periphery. Two flexible recording media in a flexible recording medium disk assembly comprising two flexible recording medium disks each having a ventilation hole and attached to a hub at a predetermined distance from each other. A substrate having a reference flat surface whose outer circumferential portion is sandwiched between the joining parts of the storage container which is divided into two and whose inner circumferential portion is in a non-contact state with the hub is arranged between the disks. In the annular region including the moving range of the recording/reproducing element on both sides of the substrate, a fan-shaped portion including the moving range of the recording/reproducing element has a surface exhibiting good flatness. Shaped air bearing plates are provided on both sides of the substrate, and the upper part of the constituent fibers is provided on the substrate in the annular region on both sides of the substrate except for the fan-shaped air bearing plate part. A flexible recording medium disc cartridge 3 is provided with a thin liner made of non-woven fabric reaching near the surface of the storage container, and a liner is provided on the portion of the storage container facing the flexible recording medium disc. The flexible recording medium disk cartridge 4 according to claim 1 or claim 2, wherein the inner peripheral part of the flexible recording medium disk is fixed to a flexible plate provided with air holes, as an air bearing plate. , the cartridge 5 of the flexible recording medium disc according to claim 1 or claim 2, in which the outer peripheral part of the air bearing plate and the outer peripheral part of the liner are used for recording. The flexible recording medium disk cartridge 6 according to claim 1 or 2, wherein the cartridge 6 is configured to protrude beyond the outer periphery of the medium disk, and the thickness of the substrate and the air bearing plate is determined by adjusting the thickness of the flexible recording medium disk. The flexible recording medium disk cartridge according to claim 1 or claim 2, wherein the cartridge has a thickness within several times the thickness of the flexible recording medium disk.