JPH0337879A - Floppy disk cartridge - Google Patents

Abstract

PURPOSE:To regulate the face wobbling of a disk and to improve durability by forming a liner on one side confronting with the recording plane of the disk with a member whose surface is coarse and the liner on other side with a member whose surface is fine. CONSTITUTION:The member of the liner 5 whose surface is coarse is used in the liner at an upper case 3 side, and the member of the liner 6 whose surface is fine is used in the liner at a lower case 4 side. When the disk 1 is rotated at high speed, an air film is generated between the plane of the liner 6 and the disk 1, and the disk 1 is rotated along the surface of the liner 6. Meanwhile, at the liner 5 side, no air film due to the rotation of the disk 1 is generated, however, a force is applied so as to apply regulation against wobbling in the outward direction of the plane of the disk 1. Also, the disk 1 is brought into contact with the liners 5 and 6 lightly, and dust can be eliminated. In such a way, the disk 1 can be stably rotated without generating the face wobbling, which improves the durability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floppy disk cartridge that stably rotates a flexible medium such as a floppy disk and is highly reliable.

[Conventional technology]

The conventional floppy disk cartridge was developed in 1987.
As described in Japanese Patent No. 191,983, dropouts are reduced by providing a suppression means within the case to remove dust and distortion from the magnetic disk.

[Problem to be solved by the invention]

The above conventional technology uses a suppressing means (lifter) inside the cartridge.
Although it is possible to remove dust and distortion from a magnetic disk (floppy disk, hereinafter referred to as a disk), when the disk is rotated at high speed, the suppressing means causes the disk to vibrate and cause surface wobbling. .

Furthermore, since the magnetic surface of the disk and the liner material slide at high speed in the suppressing portion, there is a problem that the magnetic surface of the disk is damaged.

An object of the present invention is to control the vibration of the disk so that the disk and the magnetic hedge come into stable contact with each other in a cartridge that is used by rotating the disk at high speed, and to make soft contact between the magnetic surface of the disk and the liner. The purpose is to remove dust inside the cartridge.

[Means to solve the problem]

In order to achieve the above object, a member with a rough surface is provided on one side of the liner facing the image recording surface of the disk, and a member with a fine surface is provided on the other side, and the liner is sandwiched between the disks to control surface runout and to prevent dust. This made removal possible.

Furthermore, an air passage hole is provided near the center of the cartridge case facing the side on which the disk is rotated from the outside to fluidically restrict the surface runout of the disk. Further, a filter is provided in the hole of this air passage to remove dust from the outside.

Furthermore, in order to control surface runout of the disk, instead of the liner having a rough surface, the liner is fixed to the case so as to form a waveform in the direction of rotation of the medium.

[Effect]

According to the above configuration, when the disk is sandwiched between the liner's rough surface and the fine surface and rotates at high speed, a slight air film is generated between the disk and the fine surface, and the disk moves along the fine surface. Rotate. Further, on the side of the liner that has a rough surface, the force that causes the disk to warp as described above does not work. In this way, since the disk rotates along a fine member on one surface, the surface runout of the disk is reduced. Further, by setting the distance between the rough member and the rough member to an appropriate value, it is possible to further restrict the surface runout of the disk. Dust on the magnetic surface of the disk can be removed by lightly contacting the disk with the coarse and fine members.

Furthermore, if an air passage hole is provided near the center of the case on the side opposite to the side where the disk rotates, air will flow through the hole as the disk rotates, and this air flow will restrict the surface runout of the disk. be done.

Furthermore, if the liner is attached to the case so that it has a waveform in the rotational direction of the medium instead of a member with a rough surface, there will be a gap between the air flow generated by the rotation of the disk and the waveform of the liner. Since the fluid force acts to remove the waviness of the disk, surface runout of the disk can be suppressed.

〔Example〕

Hereinafter, some embodiments of the present invention will be described with reference to FIGS. 1 to 5.

In FIGS. 1 and 2, reference numeral 11 indicates a floppy disk cartridge (hereinafter referred to as disk cartridge).
It is. FIG. 1 is a top view of the disk cartridge, and FIG. 2 is a cross-sectional view of the disk cartridge viewed from the side.

This disk cartridge 11 is formed into a flat box shape by an upper case 3 and a lower case 4. There are a pair of opposing head insertion holes 7 formed in the upper and lower cases, respectively, and a shutter 15 for opening and closing the head insertion holes.

In the space formed by the upper case 3 and lower case 4 of the disk cartridge 11, a disk for recording signals is rotatably housed. A hub 2 is located in the center of the disk 1.
A drive shaft (not shown) of a disk drive device is inserted through a drive shaft insertion hole 10 in the center of the lower case 4, attracts the hub 2, and rotates the disk.

Further, within the space, a liner is fixed to the back surfaces of the upper and lower cases 3, 4 with an adhesive or the like so as to face the image recording surface of the disk 1. Examples of liners include rayon, polyester, and the like.

The liner on the upper case 3 side uses a liner 5 member with a rough surface, and the liner on the lower case 4 side uses a liner 6 member with a fine surface. Also, the distance between the disk 1 and the upper and lower liners 5 and 6.

h2 is set to approximately 0.2 m.

According to the upper and lower disk cartridges of this embodiment.

As the disk 1 rotates at high speed, an air film is generated between the surface of the fine liner 6 on the first surface and the disk 1. On the side of the liner 5, no air film is formed due to the rotation of the disk 1, but it acts to restrict the deflection of the disk 1 in the out-of-plane direction.

In addition, since the disk rotates at a narrow interval between the rough-surfaced liner 5 and the fine-surfaced liner 6, they come into light contact and remove dust from the magnetic surface of the disk.

In this way, if the disk 1 rotates stably with less surface runout and the dust on the magnetic surface of the disk 1 is removed,
Contact with a magnetic head (not shown) that performs recording and reproduction by sandwiching the disc 1 from both sides is stable. With this magnetic head, the signal output is stable even if the force that pinches the disk, that is, the head load is small. With this magnetic head, the signal output is stable even if the force that pinches the disk 1, that is, the head load is small. Therefore, damage to the disk 1 is reduced and durability is improved.

FIG. 3 shows a second embodiment. A hole for an air passage 8 was provided near the center of the upper case 3, and a filter 9 (for example, a liner member) was attached inside the hole. Other than that, the configuration is the same as that of the previous embodiment. As a result, when the disk top rotates, air flows in from the air passage 8, and the disk top rotates along the liner 6, which has a finer surface, so that the same effect as in the previous embodiment is obtained.

Figure 4 shows the amount of disk surface runout. - It is a graph comparing the conventional ridge case and the first and second embodiments of the present invention. As can be seen from the figure, the amount of surface runout in both examples is half that of the conventional product. Therefore, it can be seen that the present invention has an effect of suppressing disk surface runout.

FIGS. 5 and 6 show a third embodiment. In this embodiment, the liner 12 is radially fixed to the upper case 3 so as to form a wave shape inside the upper case 3. The lower case 4 has the same configuration as the second embodiment. According to this embodiment, within one disc cartridge, between the air flow generated by the rotation of the disc 1 and the corrugated liner 12, there is a fluid force that causes the disc 1 to be separated from the liner 12. work. This suppresses out-of-plane deflection due to undulations on the disk, so that the disk rotates stably.

Further, there are effects similar to those of the above-mentioned embodiments.

Furthermore, it is clear that similar effects can be obtained by combining the upper case 3 and the lower case 4 with corrugated liners 12 fixed thereto, and rotating the disk 1 therein.

〔Effect of the invention〕

According to the present invention, in a disk cartridge that rotatably stores a floppy disk, (1) a liner facing the magnetic surface of the disk is formed with a member having a rough surface on one side and a member having a fine surface on the other side so as to sandwich the disk; do.

(2) In the structure of the liner of the cartridge, a hole for an air passage provided with a filter is formed near the center of the cartridge case facing the side on which the disk is rotated from the outside of the cartridge case.

(2) Instead of the liner having a rough surface, the liner is formed to have a corrugated shape in the rotational direction of the disk and is fixed to the inside of the case.

By forming the disc as described above, it is possible to suppress and prevent vibration of the disc in an out-of-plane direction during rotation due to initial deformation of the disc. Furthermore, dust within the cartridge can be removed by a liner and a filter provided within the cartridge.

As a result, the disk and the magnetic head come into stable contact, and stable recording and reproduction can be performed by the magnetic head. Furthermore, since the disk is prevented from being scratched, the life of the disk can be extended.

[Brief explanation of drawings]

FIG. 1 is a top view of a disk cartridge according to a first embodiment of the present invention, FIG. 2 is a side sectional view of the disk cartridge, and FIG. 3 is a side sectional view of a disk cartridge according to a second embodiment of the present invention. FIG. 4 is a characteristic diagram of disk surface runout with respect to the rotational speed of the disk of the present invention, FIG. 5 is a top view of the inside of the upper case of the disk cartridge of the third embodiment of the present invention, and FIG. - It is a partially enlarged view of the A line cross section. DESCRIPTION OF SYMBOLS 1... Disc, 3... Upper case, 4... Lower case 5... Rise with rough surface, 6... Liner with fine surface 8... Air passage, 9... Filter, 12...
corrugated liner

Claims (1)

[Claims] 1. A disk-shaped flexible magnetic medium (hereinafter referred to as the medium) is rotatably built into a case that combines two upper and lower disks,
Furthermore, in a floppy disk cartridge in which both sides of the medium are rotatably sandwiched between two donut-shaped liner members, one of the two liner members has a rough surface facing the medium. , wherein the other liner member is made of a member having a fine surface facing the medium. 2. A disk-shaped flexible magnetic medium (hereinafter referred to as the medium) is rotatably built into a case that combines two upper and lower disks.
Furthermore, in a floppy disk cartridge in which both sides of the medium are rotatably sandwiched between two donut-shaped liner members, of the two liner members, the liner member on the side opposite to the side that rotates the medium is The surface of the liner member facing the medium is made of a rough material, and the surface of the other liner member facing the medium is made of a fine material. A floppy disk cartridge characterized by having air circulation holes from the outside. 3. A disk-shaped flexible magnetic medium (hereinafter referred to as the medium) is rotatably built into the case, which is a combination of two upper and lower disks.
Furthermore, in a floppy disk cartridge in which both sides of the medium are rotatably sandwiched between two donut-shaped liner members, the liner member on the side opposite to the side on which the medium is rotationally driven is one of the two liner members. The surface of the liner member facing the medium is made of a rough material, and the surface of the other liner member facing the medium is made of a fine material. 1. A floppy disk cartridge characterized in that a floppy disk cartridge is provided with a hole through which air flows from the outside, and a filter is provided in the hole. 4. A disk-shaped flexible magnetic medium (hereinafter referred to as the medium) is rotatably built into the case, which is a combination of two upper and lower disks.
Furthermore, in a floppy disk cartridge in which both sides of the medium are rotatably sandwiched between two donut-shaped liner members, one of the two liner members has a surface that faces the medium. A floppy disk cartridge characterized in that the other liner member is formed into a corrugated shape in the rotational direction and is attached to the inner surface of the case, and the other liner member is made of a member having a fine surface facing the medium.