JPH1145541A - Flexible disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a load torque applied to a magnetic recording medium at the driving time and to prevent a write/read error due to lowering of the revolving speed, by providing a part of a liner with a nonfixed area which is not fixed to the inner surface of a jacket and removing dust on the surface of the magnetic recording medium in this nonfixed area. SOLUTION: Jackets 11(15) consisting of a synthetic resin are combined into a set of upper and lower parts of form an armor of the flexible disk 10, in which the magnetic recording medium 13 consisting of a flexible thin sheet made of a synthetic resin is rotatably housed. The liner 12 is composed of, for instance, a sheet of nonwoven rayon fabric, etc., and is fixed to the back surface side of the jacket 11 by welding at plural welding points, etc. A partial area of the liner 12 has no welding points, and is not fixed to the jacket 11 to form the nonfixed area 12a. One end of the nonfixed area 12a, i.e., an end part 12b in the rotating direction of the flexible disk 10 is free from the fixed area of the liner 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible disk.

[0002]

2. Description of the Related Art A flexible disk has a disk-shaped magnetic recording medium formed by providing a magnetic recording layer or a coating layer on the surface of a flexible and thin sheet made of a synthetic resin or the like and accommodated in a jacket. It is composed. And
At the time of use, the magnetic recording is performed by mounting the flexible disk on the driving device, and moving the magnetic head provided on the driving device in a predetermined direction while rotating the flexible disk and sliding the magnetic head on the surface of the magnetic recording medium. Data is written to the medium or recorded data is read from the magnetic recording medium.

Incidentally, this type of flexible disk cannot have a structure in which a magnetic recording medium is hermetically sealed by a jacket, and dust and dirt tend to adhere to the magnetic recording medium during storage or during use. In some cases, the magnetic head cannot normally read or write data from the magnetic recording medium due to such dust.

In order to prevent this, generally, as shown in FIG. 3, sheet materials made of nonwoven fabric or the like called liners 12 and 14 are provided on the inner surfaces of jackets 11 and 15 and the liners are provided. 12 and 14, the magnetic recording medium 1
3 to remove dust and dirt. In this case, in order to more effectively remove dust and the like by the liners 12 and 14, a lifter 16 is provided on one side inside the jacket 15, and the lifter 16 presses the magnetic recording medium 13 through the liner 14 toward the jacket 11 side. Thus, a configuration for increasing the contact force between the liners 12, 14 and the magnetic recording medium 13 is adopted. As the lifter 16, a leaf spring-like one obtained by bending a stainless steel plate or a plastic plate is used.

[0005] Further, with the recent increase in data capacity, flexible disks having a much larger capacity than in the past have been developed. For example, a storage capacity of about 1 to 2 Mbytes has been generally used in the past, but recently, a storage capacity of about 100 to 2 Mbytes has been used.
A storage capacity of about 130 Mbytes has been put to practical use.

In the case of these large-capacity flexible disks, the rotational speed of the storage medium in the flexible disk for reading and writing data is much higher than in the past. For example, the rotation speed was about 300 rpm in the past, but is about 3600 rpm for a large-capacity flexible disk.

[0007]

In the above-mentioned conventional flexible disk, the leaf spring used as a lifter has a relatively large elasticity and an elastic force even when its bending angle and thickness are small. And the pressure applied from the liner to the magnetic recording medium varies. For this reason, when the flexible disk is mounted on the drive device and the magnetic recording medium is rotating in a predetermined direction, the load torque applied to the magnetic recording medium by the pressing force fluctuates, that is, the load torque may increase. .

When the load torque is large as described above, the rotational speed of the magnetic recording medium is reduced, which may cause a data read or write error by the magnetic head. Such a tendency is particularly observed in the case of a large-capacity flexible disk as described above, that is, when the recording density of the magnetic recording medium is high and a high positioning accuracy is required between the magnetic head and the magnetic recording medium. This is particularly problematic.

Furthermore, the conventional flexible disk has a structure in which the magnetic recording medium is pressed against the other side of the jacket by the lifter and is displaced and bent. In other places, the elastic recording medium returns to the center by its elasticity. The recording medium fluctuates in a direction perpendicular to the recording surface. For this reason, the state of sliding contact between the magnetic recording medium and the magnetic head changes during rotation of the magnetic recording medium, which causes a problem that reading / writing by the magnetic head becomes unstable. Such a tendency is particularly remarkable when the recording density of the magnetic recording medium is high, and causes a reading or writing error.

[0010] It is an object of the present invention to provide a flexible disk which does not have the above-mentioned problems and can suppress a load torque applied to a magnetic recording medium during driving.

[0011]

According to the present invention, there is provided a flexible disk comprising a sheet-like, substantially disk-shaped magnetic recording medium, a jacket for accommodating the magnetic recording medium, and a liner mounted on the inner surface of the jacket. In the flexible disk, a part of the liner is provided with a non-fixed area that is not fixed to an inner surface of the jacket.

[0012] Preferably, one end of the non-adhered region is separated from the liner to be a free end. Preferably, the one end is an end in the rotation direction of the magnetic recording medium in the non-fixed area. Further, in a preferred embodiment, it is more preferable that the non-fixed area is provided in a part of the liner located on each side of the magnetic recording medium.

[0013]

Embodiments of the present invention will be described below.

FIGS. 1 and 2 show a flexible disk 10 according to an embodiment. This flexible disk 10
Is composed of jackets 11, 15, liners 12, 14, magnetic recording medium 13, and the like.

The jackets 11 and 15 are each made of a synthetic resin or the like, and the outer casing of the flexible disk 10 is formed by combining the jackets. Magnetic recording medium 13
Is formed by laminating a magnetic recording layer, a coating layer, and the like on the surface of a flexible thin sheet made of a synthetic resin or the like. An opening 11a (15a) through which a magnetic head (not shown) slides when the flexible disk 10 is mounted on the driving device is formed in the upper central portion of the jackets 11 and 15 in FIG.

The magnetic recording medium 13 is formed by laminating a magnetic recording layer, a coating layer, and the like on the surface of a flexible, thin sheet made of synthetic resin or the like. The liners 12 and 14 are made of, for example, a nonwoven sheet made of rayon, and are fixed on the back surfaces of the jackets 11 and 15 on the lifters 16 and 17 by welding or the like. In FIG. 1, ● indicates the welding point P.

Here, in some places of the liners 12 and 14, that is, in the non-fixed areas 12a and 14a, the liner 1
2 and 14 are not fixed to the back surfaces of the jackets 11 and 15. Further, the end portions 12b of the non-fixed regions 12a and 14a,
14 b is separated from the liners 12, 14. The ends 12b and 14b are connected to the flexible disk 10
Is the end on the rotation direction side when the magnetic recording medium 13 is rotating when the magnetic recording medium 13 is mounted on the drive device.

It is preferable that the non-fixed areas 12a and 14a are provided in the jackets 11 and 15 at locations away from the openings 11a (15a), thereby reading / writing data from / to the magnetic recording medium 13 by the magnetic head. It does not hinder the operation of.

In the flexible disk 10 of the embodiment having the above configuration, as described above, the magnetic recording medium 13
When rotating, the magnetic recording medium 13 and the liner 1
The liner 12, 12,
The 14 non-fixed areas 12a and 14a are drawn toward the magnetic recording medium 13. Then, the non-fixed region 12a,
14a are the ends 12b, 14 as shown in FIG.
b is attracted to the magnetic recording medium 13 side. In this state, when the magnetic recording medium 13 rotates in a predetermined direction, the non-fixed areas 12 of the liners 12 and 14 are rotated.
a, 14a wipe both sides of the magnetic recording medium 13,
Dust and dirt on both sides are removed.

In the above embodiment, one end of the non-fixed region is cut off from the liner, but the present invention is not limited to this. For example, the sheet-like material in the non-fixed area may be slightly slackened. In this case, the slack portion is drawn to both sides of the magnetic recording medium as described above, and dust and dirt on the surface of the magnetic recording medium are removed.

Further, it is preferable that the above-mentioned non-fixed areas are provided on both sides of the magnetic recording medium. However, a corresponding effect can be obtained by providing them on only one side.

[0022]

As described above, according to the flexible disk of the present invention, the dust and dirt on the surface of the magnetic recording medium are removed by the non-fixed area of the liner.
The load torque applied to the magnetic recording medium during driving can be reduced. Further, since the flexible disk of the present invention does not have a structure in which an elastic lifter is pressed against the magnetic recording medium as in the related art, displacement of the magnetic recording medium is prevented, and a stable sliding contact between the magnetic head and the magnetic recording medium is achieved. Can be maintained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a flexible disk according to the present invention.

FIG. 2 is an explanatory diagram of a main part of the flexible disk of FIG. 1;

3A is an explanatory view of a conventional flexible disk, and FIG. 3B is a sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flexible disk 11, 15 Jacket 12, 14 Liner 12a, 14a Non-fixed area 13 Magnetic recording medium

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinori Tanki 1601 Sakai, Atsugi-shi, Kanagawa Mitsumi Electric Co., Ltd.

Claims (4)

[Claims] 1. A sheet-like and substantially disk-shaped magnetic recording medium;
In a flexible disk having a jacket for accommodating the magnetic recording medium and a liner mounted on the inner surface of the jacket, a non-fixed area not fixed to the inner surface of the jacket is provided in a part of the liner. Flexible disk. 2. The flexible disk according to claim 1, wherein one end of the non-fixed area is separated from the liner to form a free end. 3. The flexible disk according to claim 2, wherein the one end is an end of the magnetic recording medium in the non-fixed area on the rotation direction side. 4. The flexible disk according to claim 1, wherein the non-fixed areas are respectively provided in part of liners located on both sides of the magnetic recording medium.