JPH1166801A - Shell for magnetic recording medium and magnetic recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide shells for magnetic recording media constituted to allow the easy removal of dust in the shells for the magnetic recording media and the magnetic recording medium. SOLUTION: A pair of the flat shells 20, which are integrated by combining the shells to each other to constitute an internal space for housing the magnetic recording medium so as to hold the medium with liners, have an air supply hole 21 and air discharge hole 22 disposed at the side edge of the integrated shell, a first opening/closing means 23 disposed at the air supply hole 21 so as to open at the time of air supply and a second opening/closing means 25 disposed at the air discharge hole 22 so as to open only at the time of discharging the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell for accommodating a magnetic recording medium such as a floppy disk and a magnetic recording medium.

[0002]

2. Description of the Related Art Conventionally, a floppy disk has been widely used as a magnetic recording medium, and such a floppy disk is constituted, for example, as shown in FIG. That is, in FIG. 13, the floppy disk 1
It is composed of an upper shell 2 and a lower shell 3 and a disk-shaped magnetic disk 6 housed between the shells 2 and 3 with an upper liner 4 and a lower liner 5 interposed therebetween.
The upper shell 2 and the lower shell are configured to form an internal space in which the upper liner 4, the lower liner 5 and the magnetic disk 6 can be accommodated therebetween in a state where they are combined with each other, and are not shown. Specific mechanical components, that is, mechanical components such as a shutter mechanism including a shutter and a spring, a write protector mechanism, and a lifter mechanism are incorporated. The upper liner 4 and the lower liner 5 are made of, for example, a circular non-woven fabric.
By preventing the shells 2 and 3 from contacting the inner surfaces,
The surface of the magnetic disk 6 is prevented from being damaged. The magnetic disk 6 is made of a thin disk-shaped magnetic medium.

A floppy disk having such a configuration is
It is assembled as shown in FIG. 14, in the lifter / liner assembling step shown in step ST1, a lifter mechanism (not shown) is incorporated into the upper shell 2 and the lower shell 3, and the inner surfaces of the upper shell 2 and the lower shell 3 are provided. The upper liner 4 and the lower liner 5 are respectively adhered thereto. Then, step S
In the write protector / disk mounting and ultrasonic welding process shown at T2, a write protector mechanism (not shown) is mounted on the upper shell 2 and the lower shell 3, and the magnetic disk 6 assembled in the sheet assembling process of step ST3. Is housed between the upper shell 2 and the lower shell 3. Thereby, the magnetic disk 6 is connected to the upper shell 2.
And, it is sandwiched and protected between the upper liner 4 and the lower liner 5 adhered to the inner surface of the lower shell 3. Thereafter, the periphery of the upper shell 2 and the lower shell 3 are integrated by ultrasonic welding to each other. Finally,
In the shutter incorporating process shown in step ST4,
The assembly of the floppy disk 1 is completed by incorporating the shutter mechanism, that is, the shutter 7 (see FIG. 15) and the spring (not shown).

[0004]

In recent years, the technology of high-density magnetic recording media for computers has rapidly advanced. For example, as a floppy disk as a magnetic recording medium, for example, 1 MB, 2 MB, 4 MB and 21 MB
A floppy disk having a recording density of 100 MB or even 100 MB has been developed and supplied to the market. Thus, competition for low-cost and high-reliability ultra-high-density magnetic recording media for computers using magnetic recording media is intensifying. As the unit recording density becomes smaller with the increase in the density of such a magnetic recording medium, minute dust,
With respect to dust such as dust, it is necessary to take measures against dust in a clean room and the like in a manufacturing process when a high-density recording medium is incorporated in a shell, and measures against dust of individual components constituting a product.

When such a magnetic recording medium is incorporated in a shell, the magnetic recording medium (magnetic disk 6) is conventionally sandwiched between liners 4 and 5 made of a nonwoven fabric as described above. In the manufacturing and processing steps of the non-woven fabric, environmental dust and dust generated from the non-woven fabric itself are taken into the non-woven fabric. For this reason, dust taken in the nonwoven fabric falls off the nonwoven fabric in the process of incorporating the magnetic recording medium into the shell,
It will adhere to or scratch the surface of the magnetic recording medium. For example, as shown in FIG. 15, when the upper shell 2 and the lower shell 3 are ultrasonically welded, dust 8 attached to the upper liner 2 made of a nonwoven fabric is dropped on the surface of the magnetic disk 6 by ultrasonic vibration. As a result, the dust 8 a adheres to the surface of the magnetic disk 6. Thereby, this dust 8a
When the magnetic head of the floppy disk drive comes into contact with the surface of the magnetic disk 6 for magnetic recording or magnetic reproduction from above, the dust 8a may damage the surface of the magnetic disk 6.

[0006] Such damage to the surface of the magnetic disk 6 causes a fatal defect as a product of defective writing or reading of the magnetic recording medium.
There is a problem that the reliability of the floppy disk is reduced. For this reason, conventionally, how to remove the above-mentioned dust has been a serious problem in the manufacturing process, and there has been a problem that enormous capital investment is required as a countermeasure.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a magnetic recording medium shell and a magnetic recording medium, in which dust in a shell of the magnetic recording medium is easily removed.

[0008]

SUMMARY OF THE INVENTION According to the present invention, the above object is achieved by combining and integrating
A pair of flat shells constituting an internal space for accommodating a magnetic recording medium so as to be sandwiched by a liner, and an air supply hole and an air discharge hole provided on a side edge of the integrated shell; Magnetic recording comprising: a first opening / closing means provided in the air supply hole so as to be opened; and a second opening / closing means provided in the air discharge hole so as to be opened only when air is discharged. This is achieved by a media shell.

According to the above construction, by blowing air into the assembled magnetic recording medium shell from the air supply hole into the shell, the first opening / closing means provided in the air supply hole is provided. Since the air is released by the air pressure, the air is blown into the shell through the air supply hole, circulates in the shell, and reaches the air discharge hole. Since the second opening / closing means provided in the air supply hole is opened by the air pressure, the air in the shell is discharged from the shell to the outside through the air discharge hole.
As a result, due to the flow of air blown into the shell, circulated through the shell, and then discharged out of the shell, dust present in the shell is discharged to the outside together with air, so that the inside of the assembled shell is discharged. Dust is removed.

The first and second opening / closing means are first and second opening / closing valves, respectively, which are closed by being urged toward the upstream side of the air flow, respectively. When configured to be opened by moving downstream due to fluid pressure, the first and second on-off valves are automatically opened by the pressure of air blown into the shell. Will do. Therefore, a mechanism for opening and closing the first and second on-off valves is unnecessary.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are added. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 shows a configuration of a first embodiment in which the present invention is applied to a shell of a floppy disk. In FIG. 1, a shell 10 for a floppy disk has basically the same configuration as the shell constituted by the upper shell 2 and the lower shell 3 of the conventional floppy disk 1 shown in FIG. The lower shell (not shown) is configured by being integrated by ultrasonic welding. Further, the shell 10 is provided with two holes which are open at substantially both ends at one side edge, that is, an air supply hole 11 and an air discharge hole 12.

The air supply hole 11, as shown in FIG. 2, forms a passage leading from the outside of the shell to the internal space, and has a valve body 13 as a first on-off valve. This valve body 13 is formed in a leaf spring shape, and its width is
The height is selected substantially equal to the height of the air supply hole 11. Further, one end 13a of the valve body 13 is
And the other end 13b is in a closed position in contact with a rib 11a formed on the side wall opposite to the air supply hole 11 due to its elasticity. , The air supply hole 11 is closed. Thus, when air is blown into the air supply hole 11, the pressure of the air causes the valve body 13 to move from the closed position where the other end 13 b abuts on the rib 11 a to the inner open position (reference numeral). 13c). In addition, this valve element 1
Numeral 3 is configured so as not to come into contact with the magnetic disk 14 accommodated in the shell 10 at the open position.

As shown in FIG. 3, the air discharge hole 12 forms a passage from the outside of the shell to the internal space similarly to the air supply hole 11, and has a valve as a second on-off valve. It has a body 15. This valve body 15 is also formed in a leaf spring shape, and one end 15a is fixed and held inside a shell forming the side wall of the air discharge hole 12, and the other end 15b is formed based on its elasticity. The air discharge hole 12 is closed at a closed position in contact with a rib 12 a formed on a side wall opposite to the air discharge hole 12. Accordingly, when air enters the air discharge hole 11 from the inside of the shell, the valve body 15 opens from the closed position where the other end 15b abuts on the rib 12a due to the pressure of the air. It is configured to be able to swing to a position (position indicated by reference numeral 15c).

The valve bodies 12 and 15 are made of metal or resin so as to have elasticity. Further, the air discharge hole 12 is preferably provided as shown in FIG.
As shown in (1), the shell inner portion is formed so that the air flow generated with the rotation of the magnetic disk 14 is easily guided when the magnetic disk 14 rotates.

The shell 10 according to the present embodiment is configured as described above. A liner (not shown) and a magnetic disk 14 are incorporated in the shell 10 as in the conventional case, and a shutter mechanism and the like are provided. (Not shown) is attached. Further, the two parts of the shell 10 divided into upper and lower parts are integrated with each other by ultrasonic welding or the like, so that the assembly of the product of the magnetic recording medium is completed.

Air is blown into the shell 10 from the air supply hole 11 to the assembled shell 10. As a result, the valve element 12 provided in the air supply hole 11 swings to the open position by air pressure, so that air is supplied into the shell 10 through the air supply hole 11. Then, the air blown into the shell 10 circulates through the shell 10 and then reaches the air discharge hole 12, and the valve body 15 provided in the air supply hole 12 swings to the open position by this air pressure. The air in the shell 10 is discharged from the shell 10 to the outside through the air discharge holes 12. At this time, dust and the like adhering to a liner (not shown), which is a non-woven fabric, and other components are removed from the shell 1.
In the space 0, the air is circulated in the shell 10 and discharged to the outside through the air discharge holes 12, so that the air is discharged to the outside together with the air. Thus, the assembled shell 1
The dust removal within 0 will be performed.

Next, a more specific embodiment in which the shell of FIG. 1 is applied to a shell for a floppy disk will be described with reference to FIGS. 5 and 6,
The shell 20 for a floppy disk is basically the one shown in FIG.
Has the same configuration as the shell 10 according to the embodiment shown in FIG. 1, and is configured by integrating an upper shell and a lower shell (not shown) by ultrasonic welding. Further, the shell 20 is provided with two holes opened at substantially one end on one side edge thereof, that is, an air supply hole 21 and an air discharge hole 22. Here, the shell 20 is specifically formed, for example, with a total length of 94 mm, a total width of 90 mm, a height of 3.5 mm at both ends and a height of 3.0 mm near the center, and the air supply hole 21 and the air discharge hole 22. The opening at the side edge of the shell 20 is, for example, about 8 mm wide and about 2.0 mm high.
mm is selected.

As shown in FIG. 5, the air supply hole 21 forms a passage leading from the outside of the shell 21 to the internal space, and has a valve element 23 as a first on-off valve. The valve body 23 is formed in a leaf spring shape, and its width is selected to be slightly smaller than the height of the air supply hole 11. Further, the valve body 23 has one end 23a fixedly held inside a shell forming the side wall of the air supply hole 21 and the other end 23b formed on the opposite side of the air supply hole 21 based on its elasticity. Rib 2 formed on side wall
The air supply hole 21 is substantially closed in the closed position abutting on 1a. As a result, as shown by the arrow A in FIG.
When air is blown into the inside 1, the pressure of the air allows the other end 23 b to swing from the closed position where the rib 23 a is in contact with the rib 21 a to the inner open position (the position shown by the dotted line). ing. In addition, the valve body 23 is configured such that the magnetic disk 24 accommodated in the shell 20 is opened at the open position.
It is configured so that it does not abut.

As shown in FIG. 5, the air discharge hole 22 forms a passage from the outside of the shell 20 to the internal space similarly to the air supply hole 21, and also has a second opening / closing valve. It has a valve body 25. The valve body 25 is similarly formed in a leaf spring shape, and one end 25a is fixed and held inside a shell forming a side wall of the air discharge hole 22, and the other end 25b is formed based on its elasticity. The air discharge hole 22 is closed at a closed position in contact with a rib 22a formed on a side wall opposite to the air discharge hole 22. Accordingly, when air enters the air discharge hole 21 from inside the shell, the valve body 25 moves from the closed position where the other end 15b abuts on the rib 12a to the outside valve open position by the pressure of the air. (Dotted line position)
It is configured so that it can swing up to.

The valve bodies 22 and 25 are made of metal or a resin material such as PET (polyethylene terephthalate) so as to have elasticity.
For example, it is formed in the shape of an elongated leaf spring having a width of about 2 mm, and at a position of about 45 degrees as shown in FIG. 9, a predetermined spring pressure, for example, 10 g or less for the valve body 22 on the air supply side, The body 25 is configured to have a spring pressure of 3 g or less. Further, the air discharge hole 22 is preferably provided when the magnetic disk 24 rotates, as shown in FIG.
An inner shell portion is formed so that an air flow (arrow C) generated with the rotation of the magnetic disk 24 is easily guided toward the air discharge hole 22.

Then, a liner (not shown) and a magnetic disk 24 are incorporated into the shell 20, and mechanical parts (not shown) such as a shutter mechanism are attached to the shell 20, as in the prior art. Further, the two parts of the shell 20 divided into upper and lower parts are integrated with each other by ultrasonic welding or the like, so that the assembly of the product of the magnetic recording medium is completed.

The dust inside of the assembled shell 20 is specifically removed as follows. First, as shown in FIG. 10, a jig 30 is brought into contact with a side edge of the shell 20 having the air supply hole 21 and the air discharge hole 22. The jig 30 has through holes 31 and 32 at positions corresponding to the air supply holes 21 and the air discharge holes 22 of the shell 20, respectively.
As shown in FIG. 11, an air supply device 33 is connected to the air supply hole 21 via the air discharge hole 22.
Is connected to an exhaust device 35 via a filter 34.

Here, the jig 30 has its through hole 3
The relatively large selection of the shells 1 and 32 makes it possible to cope with shells 20 of various sizes. The air supply device 33 is, for example, 3 kg / c
At m2, as shown in FIG. 12, for example, air is supplied intermittently at 3 times / second for 3 seconds.

Thus, air is intermittently supplied from the air supply device 33 to the air supply hole 21 of the shell 20 via the through hole 31 of the jig 30. The valve element 22 provided in the air supply hole 21 swings to the open position by air pressure, so that air is supplied into the shell 20 through the air supply hole 21.

On the other hand, the air blown into the shell 20 circulates through the shell 20 and then flows into the air discharge holes 22.
At the same time, the filter 3
Since the negative pressure of the exhaust device 35 is applied via the through hole 4 of the jig 30 and the jig 30, the valve body 25 provided in the air supply hole 22 is moved to the open position by the air pressure and the negative pressure of the exhaust device 35. Because of the swing, the air in the shell 20 passes through the air discharge holes 22 and further passes through the through holes 3 of the jig 30.
2 and the filter 34 are forcibly discharged to the outside. At this time, dust or the like adhering to a liner (not shown) or other component parts, which is a non-woven fabric, flows in the shell 20 and flows through the shell 20 to be discharged to the outside through the air discharge holes 22. Is discharged to the outside together with the air, and is captured by the filter 34.
Thus, dust in the shell 20 after assembly is removed. Here, the air supplied from the air supply device 33 is intermittently supplied as described above, so that the air flow itself flowing in the shell 20 has vibration, and The dust and the like adhering to the liner and the surface of the magnetic disk 24 are surely dropped and discharged to the outside.

As described above, according to the above-described embodiment, the air is blown into the shell from the air supply hole, circulates through the shell, and is discharged from the air discharge hole to the outside of the shell. The dust is discharged to the outside together with the air, and the dust in the assembled shell is removed. Accordingly, the dust in the shell is effectively removed with a simple configuration, so that the reliability of the product of the magnetic recording medium is improved and the yield is improved. Furthermore, no capital investment is required for dust removal in the manufacturing process, and the cost is significantly reduced.

In the above embodiment, the case where the present invention is applied to a shell for a floppy disk has been described. However, the present invention is not limited to this, and it is apparent that the present invention can be applied to a shell for another magnetic recording medium. . For the shell 20 described above, the dust in the shell 20 is removed using the jig 330 and the air discharge hole 22.
It is configured to forcibly exhaust air by connecting the exhaust device 35 via the filter 34, but the invention is not limited thereto. Similarly to the above, dust may be removed by the air flow blown into the air supply hole 21 being naturally exhausted from the air exhaust hole 22. Furthermore, in the embodiment described above, the shell 1
Reference numerals 0 and 20 denote two upper and lower shells which are integrated with each other by ultrasonic welding. However, the present invention is not limited to this. Obviously it is good.

[0029]

As described above, according to the present invention, it is possible to provide a magnetic recording medium shell and a magnetic recording medium in which dust in the shell of the magnetic recording medium can be easily removed.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a floppy disk shell to which the present invention is applied.

FIG. 2 is an enlarged perspective view showing the vicinity of an air supply hole in the shell of FIG. 1 in detail.

FIG. 3 is an enlarged perspective view showing the vicinity of an air discharge hole in the shell of FIG. 1 in detail.

FIG. 4 is an enlarged perspective view showing an air flow near an air discharge hole in the shell of FIG. 1;

FIG. 5 is a schematic plan view showing a more specific embodiment in which the shell of FIG. 1 is applied to a shell for a floppy disk.

FIG. 6 is a front view of the shell of FIG. 5;

FIG. 7 is an enlarged front view showing the vicinity of an air supply hole of the shell in FIG. 5;

FIG. 8 is an enlarged front view showing the vicinity of an air discharge hole of the shell of FIG. 5;

9 is an enlarged perspective view showing a state when a spring pressure of a valve body used in the shell of FIG. 5 is measured.

FIG. 10 is a schematic plan view showing the inside of the shell of FIG. 5 when dust is removed.

11 is a schematic block diagram showing the configuration of an apparatus for performing dust removal shown in FIG.

FIG. 12 is a graph showing air supply from an air supply device for performing dust removal in FIG. 10;

FIG. 13 is an exploded perspective view showing a schematic configuration of a conventional floppy disk.

FIG. 14 is a process diagram showing an assembly process of the floppy disk of FIG.

FIG. 15 is an enlarged sectional view showing the attachment of dust to the magnetic disk when the floppy disk of FIG. 13 is assembled.

[Explanation of symbols]

10, 20 shell, 11, 21 air supply hole, 11a, 12a, 21a, 22a rib, 1
2, 22, ... air discharge holes, 13, 15, 23, 25
..Valves, 14, 24 ... magnetic disks, 30 ...
Jig, 33 ... air supply device, 34 ... filter,
35 ... Exhaust device.

Claims (5)

[Claims] 1. A pair of flat shells, which are combined with each other and integrated to form an internal space for accommodating a magnetic recording medium so as to be sandwiched by a liner, wherein a pair of flat shells are formed on side edges of the integrated shell. An air supply hole and an air discharge hole provided, a first opening / closing means provided in the air supply hole so as to be opened only when air is supplied, and an air discharge hole so as to be opened only when air is discharged. A shell for a magnetic recording medium, comprising: a second opening / closing means provided. 2. The first and second on-off means are first and second on-off valves, respectively, and the first and second on-off valves are respectively urged toward the upstream side of the airflow. 2. The magnetic recording medium shell according to claim 1, wherein the shell is configured to be closed by being moved and to be opened by being moved downstream by an air flow pressure. 3. The magnetic recording medium shell according to claim 2, wherein the first and second on-off valves are leaf springs fixedly held between the pair of shells. 4. The magnetic recording medium shell according to claim 3, wherein the first and second on-off valves are made of a metal and / or a resin material. 5. A pair of flat shells forming an internal space for accommodating a magnetic recording medium by being combined and integrated with each other, and a liner for protecting a magnetic recording medium adhered to the inner surface of each shell. And a magnetic disk accommodated in the inner space of the shell, wherein the shulle has an air supply hole and an air discharge hole provided on an integrated side edge, and is opened only when air is supplied. A first opening / closing means provided in the air supply hole, and a second opening / closing means provided in the air discharge hole so as to be opened only at the time of air discharge. recoding media.