JPH11176129A - Magnetic disc cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent cleaning performance and improve the reliability of a magnetic disc medium while the increase of the rotation torque of the magnetic disc medium is suppressed as much as possible. SOLUTION: A magnetic disc medium 4 is rotatably housed in a case consisting of an upper shell 1 and a lower shell 2 which are connected to each other. Liners 5 and 6 are fixed to the respective inner surfaces of the upper and lower shells 1 and 2 which face the magnetic disc medium 4. The liners 5 and 6 are composed of nonwoven fabric sheets. Napped parts 5a, 5b, 6a and 6b where the fibers of the sheets are partially napped so as to be brought into contact with the surfaces of the magnetic disc medium 4 in a rotating state are provided.

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 in which a magnetic disk medium is accommodated in a case, and the magnetic disk medium is rotated and used for magnetic recording and reproduction. Cleaning structure.

[0002]

2. Description of the Related Art A magnetic disk cartridge contains a disk-shaped magnetic disk medium rotatably housed in a case formed by joining upper and lower shells. It is expensive to perform recording and reproduction on the magnetic disk medium by a magnetic head. It is necessary to ensure reliability.

[0003] From the viewpoint of ensuring the reliability, it is important that dust that causes so-called dropout does not adhere to the magnetic disk medium or the magnetic head. The dust is generated inside the magnetic disk cartridge and invades from the outside, but it is difficult to completely prevent the generation and intrusion.

In order to wipe off dust adhering to the magnetic disk medium, a liner made of non-woven fabric or the like is provided on the inner surface of the case, and this liner is brought into contact with the magnetic disk medium surface by a lifter to wipe the magnetic disk medium surface. Has been done.

[0005]

In the magnetic disk cartridge, however, the rotation speed is increased in response to the increase in the recording capacity of the magnetic disk medium, and the stability of the driving torque and the torque capacity of the motor are ensured. From the viewpoint of suppressing the up, there is a tendency to reduce the contact with the liner. Along with this, the dust removal effect on the surface of the magnetic disk medium by the liner is reduced, and problems such as the occurrence of dropout due to the accumulation of dust adhering to the magnetic disk medium in the head gap of the magnetic head become remarkable. Needed.

For example, in a large-capacity magnetic disk cartridge system to which the present invention is applied, a recording wavelength is short, and a magnetic disk medium is used for securing a transfer rate.
This method rotates at high speed, such as rpm, to reduce the contact load of the liner on the rotational torque and to reliably clean the surface of the magnetic disk media to prevent the dust from affecting the head gap. Need to be secured. On the other hand, in this large-capacity magnetic disk cartridge drive device, it is necessary to provide a low-speed rotation drive in order to enable recording / reproduction of a conventional magnetic disk cartridge having a lower recording capacity.
It is necessary that the drive motor supports a low-speed to a high-speed rotation and obtains a certain or more rotational torque. Further, this drive device needs to be compatible with a desktop personal computer to a light and thin notebook type personal computer, and the drive motor is required to be low power and thin, and it is difficult to obtain high rotational torque.

In consideration of the above, as described above, a large-capacity magnetic disk cartridge has a drive torque of the magnetic disk medium as small as possible, that is, an interference action with a component other than the magnetic head when the magnetic disk medium rotates at a high speed. It is required that there be as little as possible.

[0010] That is, dust removal of the magnetic disk medium by wiping by pressing the liner is effective in preventing dropout. However, the entire contact between the magnetic disk medium and the conventional liner and lifter causes loss torque. The driving torque is greatly increased and is not suitable for high-speed rotation during large-capacity recording / reproduction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a magnetic disk cartridge capable of improving reliability by obtaining a good cleaning action while minimizing an increase in drive torque of a magnetic disk medium. It is something you want to do.

[0010]

According to a magnetic disk cartridge of the present invention, which solves the above-mentioned problems, a disk-shaped magnetic disk medium is rotatably housed in a case formed by joining an upper shell and a lower shell, and the magnetic disk cartridge is provided with a magnetic disk. Liners are fixed to the inner surfaces of the upper shell and the lower shell facing the disk media, respectively. The liners are formed of a non-woven fabric into a sheet shape, and a part of the fibers is located at a position where the fibers contact the rotating magnetic disk media surface. It is characterized by having a raised portion raised by the raising process.

It is preferable that at least the raised portion of the liner is adhered to the inner surface of the shell in a surface state by an adhesive or the like.

Preferably, the raised portions of the liner are provided at the same position with respect to the upper and lower surfaces of the magnetic disk medium. Further, the raised portion is preferably provided in a portion near the magnetic head insertion opening. Similarly, the raised portion is preferably provided at a position substantially opposite to the magnetic head insertion opening.

In the above-described magnetic disk cartridge, the raised portion of the liner comes into contact with the surface of the magnetic disk medium as the magnetic disk medium rotates, and the liner comes into contact with dust adhering to the surface of the magnetic disk medium. The dust is then triggered to move, and the dust that has begun to move is moved by the centrifugal force and the airflow generated in the outer circumferential direction along the surface of the magnetic disk medium, and is removed from the magnetic disk medium surface to the outer peripheral portion. Cleaning is performed.

[0014]

According to the present invention as described above, by raising some of the fibers of the liner by the raising process, the raised portion adheres to the surface of the magnetic disk medium as it rotates. It is easy to move by giving the initial movement energy by contacting the dust that is present, and thereafter it is moved by the centrifugal force accompanying the rotation of the magnetic disk medium and the air flow toward the outer circumference, and from the surface of the magnetic disk medium to the outside. It is possible to reliably remove the surface of the magnetic disk medium, and to improve the reliability without causing dropout or the like due to dust adhering to the head gap of the magnetic head. At the same time, the contact of the raised portion is partial and the contact resistance is small, and the rotation of the magnetic disk medium Against by reducing the increase in the torque loss, it is possible to perform high speed drive stably.

The raising of the liner can be carried out, for example, by sucking the adhesive portion, and the productivity is good and the cost is advantageous. In addition, since the raising is partial, the raising process can be performed easily and reliably, and the cleaning action can be secured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is an exploded perspective view of the upper and lower shells of a magnetic disk cartridge according to one embodiment.

In the magnetic disk cartridge, a flat case C (hard case) is formed by joining an upper shell 1 and a lower shell 2 formed of a synthetic resin such as acrylonitrile-butadiene-styrene copolymer. A disk-shaped magnetic disk medium 4 whose central portion is attached to and held by the center core member 3 is rotatably accommodated in C. An upper liner 5 and a lower liner 6 are provided above and below the magnetic disk medium 4.

The magnetic disk medium 4 has a disk-shaped base made of a flexible polyester sheet or the like, and magnetic layers are formed on both sides of the disk-shaped base. An area 4a is set, and the inner and outer edges of this recording area are non-recording areas 4b.
The rotation speed of the magnetic disk medium 4 is 3000 to 5 in the case of a 3.5-inch magnetic disk medium 4.
000 rpm, for example, 3600 rpm.

The upper shell 1 and the lower shell 2 have a substantially rectangular flat shape, and outer peripheral ribs 1a and 2a forming side walls are provided on the outer periphery, and the inner ribs 1b and 2b are substantially obliquely provided at corners. And a rectangular magnetic head insertion slot 1
0 and 11 are opened, and a spindle hole 2 c having a circular shape is formed in a central portion of the lower shell 2 so as to face the center core member 3. Although not shown, a shutter member slidable in the left-right direction in the figure is assembled to open and close the magnetic head insertion openings 10 and 11 of the case C.

Further, on the inner surfaces of the upper shell 1 and the lower shell 2, an octagonal (or round) upper liner 5 and a lower liner 6 made of a nonwoven sheet are attached. The internal ribs 1b, 2b are
Is formed on the outside along the shape of.

An annular projection 12 is provided at the center of the inner surface of the upper shell 1 at a position inward of the center core member 3. The movement of the medium 4 in the radial direction is restricted.

The upper liner 5 and the lower liner 6 have the same shape, and the portion overlapping the magnetic head insertion openings 10 and 11 is cut off, and the central portion is slightly larger than the outer diameter of the annular projection 12 or the spindle hole 2c. A circular hole is opened.

The upper and lower liners 5, 6 are provided with raised portions 5a, 5b, 6a, 6b in which fibers are raised up at the same position in both liners 5, 6. The first raised portions 5a and 6a are provided at the magnetic head insertion openings 10 and 1 respectively.
In the vicinity of both sides of the recording medium 1, it is formed in a narrow band shape so as to extend in a substantially radial direction to a length corresponding to the recording area 4 a of the magnetic disk medium 4. Similarly, the second raised portions 5b, 6b extend in the radial direction to a position corresponding to the recording area 4a of the magnetic disk medium 4 at a position opposite to the magnetic head insertion openings 10, 11, and have a narrow band shape. Is formed.

The first raised portions 5a and 6a are
The cleaning action is sufficient if it is on the upstream side with respect to the rotation direction of the magnetic head insertion ports 10 and 11,
It is desirable to provide the magnetic disk medium 4 on both sides and at the same position on the upper and lower surfaces in order to ensure stability so as not to cause surface deflection or the like during rotation of the magnetic disk medium 4.

The raised portions 5a of the upper and lower liners 5, 6
The napping treatment of the bristles 5b, 6a, 6b includes the liner 5,
6 is fixed to the inner surfaces of the upper and lower shells 1 and 2 by an adhesive or the like, and after this bonding, the raised portions 5a, 5b, 6
A mask having an opening corresponding to the areas a and 6b is applied and suctioned by vacuum to partially raise the fibers of the nonwoven fabric. Due to the bonding in the bonding area 7, the cloth does not bulge and the hair is not raised or removed more than necessary. The length (height) of the raised hair is set such that the tip lightly contacts the surface of the rotating magnetic disk medium 4.

According to the magnetic disk cartridge described above, when the magnetic disk medium 4 is inserted into the drive device and driven to rotate, the raised ends of the raised portions 5a, 5b, 6a, 6b of the upper and lower liners 5, 6 are raised. The portion lightly contacts the surface of the magnetic disk medium 4. The dust adhering to the surface of the magnetic disk medium 4 has a slight adhesive property, and the raised ends of the raised portions 5a, 5b, 6a, 6b of the upper and lower liners 5, 6 come into contact with each other, so that the dust comes into contact with the dust. By giving transfer energy that exceeds the adhesive force,
The dust starts to move, moves in the outer peripheral direction due to the centrifugal force of the dust caused by the high-speed rotation of the magnetic disk medium 4, and the rotation of the magnetic disk medium 4 generates an air flow flowing outward on the surface thereof. This air flow also moves in the outer peripheral direction, and floats and is absorbed and absorbed by the upper and lower liners 5, 6 or is removed to the outside of the recording area 4a to perform cleaning, and dust is brought into contact with the magnetic head. Prevent intrusion into the area to avoid dropouts.

The contact between the raised end for the cleaning action and the surface of the magnetic disk medium 4 is a partial contact with the entire magnetic disk medium 4 and the raised end. The drive loss of the rotational torque of the magnetic disk medium 4 is small, and high-speed rotation of the magnetic disk medium 4 can be stably and reliably performed by a small drive motor.

Some of the dust (especially small dust) adhering to the magnetic disk medium 4 is trapped and removed by brushing, but the dust is not removed mainly by wiping, but is removed. Is made movable on the surface of the magnetic disk medium 4 during high-speed rotation,
A brush corresponding to this is provided so that dust can be removed by removing the dust from the surface of the magnetic disk medium 4, and the contact resistance is reduced.

As a method of forming the raised material, besides raising the fibers of the non-woven fabric by suction using the above-mentioned vacuum, a known method can be adopted. However, a raised process that does not cause the raised material to fall off and become dust is selected. . In addition, the brushing range can be appropriately changed in design, and may be further provided partially or in a wider range within the limit of increasing the contact resistance,
In addition, it is necessary to provide the recording area 4a such that the contact area with respect to the rotation of the magnetic disk medium 4 is the whole of the recording area 4a even if it is not continuous in the radial direction.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an upper and lower shell of a magnetic disk cartridge and a magnetic disk medium according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper shell 2 Lower shell 2c Spindle hole C case 3 Center core member 4 Magnetic disk medium 4a Recording area 5,6 Liner 5a, 5b, 6a, 6b Brushed part 7 Adhesion area 10,11 Magnetic head insertion opening 12 Ring projection

Claims (2)

[Claims] 1. A disk-shaped magnetic disk medium is rotatably accommodated in a case formed by joining an upper shell and a lower shell, and liners are respectively fixed to inner surfaces of an upper shell and a lower shell facing the magnetic disk medium. In the magnetic disk cartridge, the liner is formed in a sheet shape by a nonwoven fabric, and a raised portion raised by a raising process is provided to a position where a part of the fibers comes into contact with the surface of the rotating magnetic disk medium. A magnetic disk cartridge, comprising: 2. The magnetic disk cartridge according to claim 1, wherein at least the raised portion of the liner is adhered to the inner surface of the shell by an adhesive or the like in a surface state.