JP3518651B2 - Recording medium 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 recording medium cartridge containing a disk-shaped recording medium (hereinafter referred to as a medium) in a case formed by joining upper and lower shells, and more particularly to a magnetic disk cartridge for removing dust and the medium. The present invention relates to the addition of stability when rotating at high speed.

[0002]

2. Description of the Related Art A recording medium cartridge, particularly a magnetic disk cartridge, is a flexible magnetic disk medium rotatably housed in upper and lower shells made of synthetic resin.

Needless to say, it is necessary to ensure high reliability in this magnetic disk cartridge. From the viewpoint of reliability, it is important to prevent the dust that causes so-called dropout from adhering to the medium or to immediately remove the attached dust. The dust may not only enter from the outside of the magnetic disk cartridge, but may also be generated inside the magnetic disk cartridge, for example, from a liner or the like arranged to protect the medium.

On the other hand, in response to the recent increase in the density of media, the high-speed rotation of the media has been aimed at. In this high-speed rotation, air turbulence (hereinafter referred to as turbulent flow) generated by the rotation of the medium becomes remarkable, and vibration of the medium, so-called disc flutter phenomenon occurs, which causes output fluctuation. When this vibration is significant, the medium and the head may come into contact with each other with a certain impact force, and a head crush may occur that damages both.

Further, when the above-mentioned dust adheres to the medium, the dust itself can cause a head crash, so that comprehensive measures are required.

From the above points, Japanese Patent Publication No. 3-5035
No. 6, a radial groove is provided on the inner surface of the shell to stabilize the internal air flow and prevent the occurrence of disk flutter, and as shown in JP-A-8-87853, the upper center of the case There is disclosed a technique in which an air vent provided with a filter is provided in the lower part and a lower part, and an air flow is generated from this air vent to a side opening to prevent intrusion of dust.

[0007]

In the prior art as described above, however, the mutually related problems of dealing with dust generated inside the magnetic disk cartridge, removing dust and increasing the speed of the medium are compatible. It is not something that can be solved.

The present invention has been made in view of the above problems, and it is possible to remove dust, especially dust generated inside a magnetic disk cartridge, and at the same time stabilize high-speed rotation of a medium, The purpose of the present invention is to provide a cartridge for a recording medium, which has extremely high reliability and can cope with high density of the medium and which can be rotated at a high speed.

[0009]

The recording medium cartridge of the present invention, which has solved the above-mentioned problems, enables a flexible disk-shaped medium to rotate in a case by joining an upper shell and a lower shell. Inner surfaces of the upper shell and the lower shell that are accommodated and at least face the above media
In the case where liners are fixed to the whole , at least one intake port penetrating the top surface or the bottom surface of the case is opened in the center side part of the case and within the installation range of the liner, and the outer peripheral edge of the case An exhaust port is opened in a joint surface between the upper shell and the lower shell of the part, and an air flow from the intake port to the exhaust port is generated as the medium rotates.

The cross-sectional area of the intake port is 0.2 to 2.5 because of the ease of intake and the difficulty of ingress of dust from the outside.
mm ^2, more preferably 0.5 to 2.0 mm ^2, and most preferably better be 0.7 to 1.2 mm ^2. A circular shape, a slit shape, or the like is appropriately selected as the shape, but the slit shape is desirable from the viewpoint of the difficulty of ingress of dust. The number of installation is required to be at least one, but two or more are effective, and 4 to 8 are preferable from the viewpoint of aesthetics and preventing dust from entering through the openings.

Although the cross-sectional area of the exhaust port is the same as that of the intake port, the shape of the exhaust port may be a minute gap structure which is not normally recognized as the exhaust port. In that case, the gap size is preferably 5 to 100 μm, more preferably 10 to 70 μm, and most preferably 20 to 50 μm. If the exhaust port is exposed when the shutter member that opens and closes the head insertion port is in the open position, dust is prevented from entering because the shutter member covers the media when not in use. it can.

The liner may be extended at the opening of the exhaust port facing the side in which the medium is accommodated, to mechanically prevent dust from entering.

On the other hand, it is preferable that ribs are provided on the inner surfaces of the upper shell and the lower shell to bring the liner close to the surface of the medium. Moreover, it is desirable to dispose the ribs so as to concentrate the airflow toward the exhaust port in order to generate a more stable airflow.

[0014]

According to the recording medium cartridge of the present invention as described above, the liners are fixed to the inner surfaces of the upper shell and the lower shell facing the disc-shaped medium, respectively, and the liner is fixed to the center side portion of the case and the liner. By opening the intake port in the installation range and opening the exhaust port in the joint surface of the upper and lower shells of the outer peripheral edge portion of the case, the air flow in a certain direction is generated by the rotation of the media and is generated from the liner. Dust adhering to the media surface,
It can be removed reliably along with the air flow.

By installing the rib, a part of the liner is always in contact with the medium, so that the dust adhering to the medium surface can be directly removed. Further, since the rib positively directs the flow of the airflow to the exhaust port side and has a rectifying function, it is possible to prevent the airflow from becoming turbulent due to the high speed rotation of the medium, and to prevent disc flutter.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below based on the embodiments shown in the drawings. FIG. 1 is an external perspective view of a magnetic disk cartridge as an example of a recording medium cartridge, and FIG. 2 is an exploded perspective view thereof.

In the magnetic disk cartridge, a flat case C is formed by joining an upper shell 1 and a lower shell 2 made of a resin molded product such as an acrylonitrile-butadiene-styrene copolymer, and the like. A disk-shaped medium 4 as a recording medium fixed to the hub 3.
A (magnetic disk medium) is stored in a rotatable state, and an upper liner 5 and a lower liner 6 are installed above and below the medium 4. In the medium 4, a recording area 4a is set in an annular shape excluding the outer peripheral portion and the inner peripheral portion, and the outer edge portion of the recording area 4a is the outer peripheral non-recording portion 4b.

The upper shell 1 and the lower shell 2 have a substantially rectangular flat plate shape, and an outer peripheral rib 1 forming a side wall on the outer periphery.
a and 2a are provided, and the internal ribs 1 are provided at the corners substantially obliquely.
b, 2b are provided, and the rectangular magnetic head insertion opening 10,
11 is opened. Further, an octagonal upper liner 5 and a lower liner 6 made of a non-woven fabric or the like are attached to the inner surfaces of the upper shell 1 and the lower shell 2 by ultrasonic welding or the like. The internal rib 1b,
2b is formed on the outside of the liners 5 and 6 along the shape thereof.

An annular rib 1c for supporting the rotation of the center hub 3 is provided at the center of the upper shell 1, and a hub hole 2c for inserting the driving rotary head of the center hub 3 is provided at the center of the lower shell 2. Is provided.

Further, the case C is assembled with a shutter member 7 which is slidable for opening and closing the magnetic head insertion ports 10 and 11. The shutter member 7 is made of, for example, a metal plate or plastic and has a substantially U-shaped cross section, and has openings 7a corresponding to the magnetic head insertion openings 10 and 11.

In the central portion of the case C and within the installation range of the liners 5 and 6, four intake ports 12 and 13 penetrating the top and bottom of the case C are opened in the illustrated case. . Further, on the front end surface which is the outer peripheral edge portion of the case C, the joint surface between the upper shell 1 and the lower shell 2 at the position opened and closed by the shutter member 7, that is, the outer peripheral ribs 1a and 2a of the upper and lower shells 1 and 2 is formed. A groove-like recess is provided on the joint end face to open the exhaust port 14. Since the exhaust port 14 is opened only when the shutter member 7 is opened, it is possible to prevent dust from entering from the outside when the shutter member 7 is closed, that is, when the magnetic disk cartridge is not used.

On the other hand, the straightening ribs 1 that bring the liners 5 and 6 closer to the surface of the medium 4 on the inner surfaces of the upper shell 1 and the lower shell 2 so that the liner surfaces come into contact with the air flow.
6 and 17 are installed. In addition, the straightening ribs 16,
The reference numeral 17 extends from the center side toward the exhaust port 14, is configured to concentrate the air flow at the exhaust port 14, prevents turbulence of the air flow, and obtains a stable air flow smoothly flowing to the exhaust port 14. To be

With the magnetic disk cartridge as described above, as the medium 4 rotates, an air flow is generated around the medium 4 from the central portion toward the outer peripheral portion, and the central portion is decompressed to the outside air from the intake ports 12 and 13. Is sucked in, and the outside air contains dust, but since the liners 5 and 6 act as filters, a clean air flow is obtained after passing through the liners 5 and 6, and dust on the surface of the medium 4 can be removed. . Also, the centrifugal force of the media 4 itself acts,
The dust is blown away in the radial direction, is captured by the airflow, and is carried toward the exhaust port 14.

Further, since the parts of the liners 5 and 6 directly contact the surface of the medium 4 by the flow adjusting ribs 16 and 17, dust attached to the surface of the medium 4 is directly removed. Further, the flow-regulating ribs 16 and 17 positively direct the flow of the airflow to the side of the exhaust port 14 and also have a flow-rectifying action to prevent the airflow from becoming turbulent due to the high-speed rotation of the medium 4, and the disc flutter Is being prevented.

3 and 4 show another embodiment,
This is an example in which the exhaust port 15 is provided on the side surface of the case C. Others are the same as those in FIGS. 1 and 2, and the same portions are denoted by the same reference numerals and the description thereof will be omitted.

The outer peripheral ribs 1a and 2a on the side surfaces of the upper shell 1 and the lower shell 2 are provided with two exhaust ports 15 by providing concave portions on their joint end faces, and the exhaust ports 15 are also provided with the media 4. It is arranged so as to incline obliquely in correspondence with the rotation direction of the above and match the air flow direction.

[Brief description of drawings]

FIG. 1 is an external perspective view of a magnetic recording cartridge as a recording medium cartridge according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the upper and lower shells of the magnetic recording cartridge and the medium.

FIG. 3 is a partial plan view of a recording medium cartridge according to another embodiment.

FIG. 4 is a side view of the recording medium cartridge in FIG.

[Explanation of symbols]

1 upper shell 2 Lower shell 1a, 2a outer peripheral rib C case 4 media (recording media) 5,6 liner 7 Shutter member 10, 11 Magnetic head insertion port 12,13 Intake port 14,15 exhaust port 16, 17 Straightening rib

Claims (3)

(57) [Claims] 1. A disk-shaped flexible recording medium is rotatably accommodated in a case formed by joining an upper shell and a lower shell, and at least faces the recording medium.
A cartridge for a recording medium in which liners are fixed to the entire inner surfaces of the upper shell and the lower shell of the range, at least in the center side portion of the case and within the installation range of the liner, penetrating the top surface or the bottom surface of the case, at least An intake port is opened at one place, and an exhaust port penetrating the outer peripheral edge portion is opened at the joint surface between the upper shell and the lower shell of the outer peripheral edge portion of the case, and the intake air is accompanied by the rotation of the recording medium. A recording medium cartridge, which is characterized by generating an air flow from a mouth to an air outlet. 2. The liner is provided at an opening of the exhaust port facing the side where the recording medium is accommodated, and the liner is extended to block intrusion of dust from the outside. A recording medium cartridge according to item 1. 3. The recording medium cartridge according to claim 1, wherein ribs are provided on the inner surfaces of the upper shell and the lower shell to bring the liner close to the surface of the recording medium.