JP3064543B2 - Magnetic disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk cartridge used for an external storage device of a computer, and more particularly to a magnetic disk cartridge capable of high-speed recording / reproduction.

[0002]

2. Description of the Related Art A magnetic disk cartridge called a floppy disk is widely used for external storage of a computer. As shown in FIG. 3, the disk-shaped flexible magnetic recording medium 3 is housed in a hard case called shells 1a and 1b. To remove dust adhering to the magnetic recording medium, the inner surface of the shell is removed. A fibrous sheet called liners 2 a and 2 b is provided at a portion facing the magnetic recording medium, and a plate called a lifter 4 is provided to press the liners 2 a and 2 b against the magnetic recording medium 3.

A conventional floppy disk has a capacity of 300 minutes per minute.
Although the medium has been rotated at the speed of rotation to read and write information, in recent years, attempts have been made to increase the rotation speed to 3,600 revolutions per minute to improve the processing speed.

[0004]

However, when the conventional floppy disk is rotated at a high speed, there is a problem that the friction between the liner and the medium causes scratches and deteriorates the durability of the medium.

[0005]

This onset Ming magnetic disk cartridge SUMMARY OF THE INVENTION are disc-shaped and flexible magnetic recording medium, and the shell of the hard case matches the magnetic recording medium, a magnetic recording medium of the shell inner surface A magnetic disk cartridge comprising: a liner made of a fibrous sheet provided at a portion facing the magnetic recording medium; and a plate-like lifter which constantly urges the liner in a push-up direction. Press down on the lifter from a magnetic disk cartridge having a means for preventing contact between the liner and the magnetic recording medium, the lifter have a protrusion extending outward from the outer periphery of the magnetic recording medium, said projection parts and hole is provided at a position of the shell corresponding to the depressing said lifter, and means for preventing contact between the liner and the magnetic recording medium , In the through hole, and is characterized in that the slide member movable in the direction depression of the lifter is fitted.

[0006]

The liner is in contact with the magnetic recording medium by being pushed up by the lifter. During high-speed rotation, contact between the liner and the magnetic recording medium can be prevented by pressing down the lifter from the outside.

[0007] When the lifter cannot be pushed down, the liner and the magnetic recording medium are in contact with each other as in the case of the conventional disk cartridge, and there is no lifter pushing device.
When a conventional floppy disk device is used, reading and writing are performed in the same manner as a conventional disk cartridge.

As means for pressing down the lifter to prevent the liner from coming into contact with the magnetic recording medium, the lifter is provided with a projection extending outward from the outer periphery of the magnetic recording medium, and a through hole is formed in a shell corresponding to the projection. Is provided, it is easy to push down the lifter from the outside. In addition, the intrusion of dust through the through hole can be prevented by inserting the slide member into the through hole.

The through hole for pushing down the lifter can also be used to identify that the magnetic disk cartridge is compatible with high-speed rotation. That is, the drive attempts to depress the lifter, and only needs to perform high-speed reading and writing when it is normally lowered. When a conventional magnetic disk cartridge having no through hole for pushing down the lifter is inserted, the lifter pushing-down device hits the shell, so that it is identified that the cartridge is not the magnetic disk cartridge according to the present invention. In such a case, reading and writing may be performed at a low speed.

[0010]

1 and 2 show one embodiment of the present invention.
FIG. 1 shows the shell opened so that a shell, a liner, a lifter (a portion indicated by a dotted line is below the liner), and a slide member for pushing down the lifter can be seen. FIG. 2 shows details of the lifter portion. It is sectional drawing. Less than,
The present invention will be described in detail with reference to this drawing.

The magnetic recording medium 3 is housed inside hard synthetic resin shells 1a and 1b. Liners 2a, 2b made of non-woven fabric are attached to the inside of the shells 1a, 1b by partial bonding. A part of the liner is pushed up by the lifter 4 to wipe off dust on the magnetic recording medium.

The lifter 4 is formed of an elastic resin plate, and pushes up the liner upward by the elasticity of the lifter itself. The lifter 4 has a protrusion 4 a extending outside the outer periphery of the magnetic recording medium 3. Shell 1a
Has a through hole 6 at a position corresponding to the protrusion 4a. A slide member 5 that slides in the up-down direction in FIG. 2 is inserted into the through hole 6 to prevent dust from entering through the through hole 6.

When the lifter 4 is not pushed down through the slide member 5, the magnetic disk cartridge of this embodiment functions in the same manner as a conventional magnetic disk cartridge. When the slide member is pushed from outside and the lifter 4 is pushed down, the liners 2a, 2b and the magnetic recording medium 3 are brought into a non-contact state, and high-speed reading and writing becomes possible.

[0014]

As described in detail above, the magnetic disk cartridge of the present invention can perform high-speed reading and writing, and can perform the same reading and writing with a conventional apparatus. Further, in implementing the present invention, it is only necessary to slightly increase the shape of the lifter, provide a through-hole in the shell, and insert a small slide member into the through-hole, and the cost for implementation is small.
Further, the through hole for pushing down the lifter can be used to identify that the magnetic disk cartridge is compatible with high-speed rotation.

[Brief description of the drawings]

FIG. 1 is a plan view showing the inside of a magnetic disk cartridge according to an embodiment.

FIG. 2 is an enlarged longitudinal sectional view of the vicinity of a slide member of FIG.

FIG. 3 is an exploded perspective view of the floppy disk.

[Explanation of symbols]

 1a, 1b Shell 2a, 2b Liner 3 Magnetic Recording Medium 4 Lifter 5 Slide Member 6 Through Hole

Claims (1)

(57) [Claims] 1. A disk-shaped flexible magnetic recording medium, comprising:
Shell as a hard case containing the air recording medium;
Provided on the inner surface of the shell facing the magnetic recording medium
A liner made of a fibrous sheet;
A plate-like plate that is constantly biased in the push-up direction
A magnetic disk cartridge equipped with a lifter
And push down the lifter from outside the shell to make the liner and magnetic
Equipped with means for preventing contact with air recording mediaMagnetic disk
Cartridge, The lifter extends outside the outer periphery of the magnetic recording medium
A projection having a projection, and a through hole is formed in the shell at a position corresponding to the projection.
Is provided, Depressing the lifter, the liner and the magnetic recording medium
As means for preventing contact with the lifter,
The slide member that can move in the down direction of the
Was A magnetic disk cartridge characterized by the above-mentioned.