JP2696054B2 - 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 disk cartridge, and more particularly, to a large capacity disk cartridge.

[0002]

2. Description of the Related Art In recent years, a large number of easy-to-handle and inexpensive magnetic disk cartridges of 3.5 inch size have come to market as magnetic storage / reproduction systems as external information storage devices. .

For example, in a 3.5-inch magnetic disk cartridge, a magnetic disk having a metal hub installed at the center is rotatably housed in a pair of jackets made of ABS resin.

The first jacket is formed with a magnetic head insertion opening for bringing the magnetic head into contact with the magnetic disk in the jacket, and a hub exposure opening for exposing the hub to the outside. A liner made of a nonwoven fabric is installed on the inner surface of the jacket.

The second jacket has a magnetic head insertion opening formed in the same manner as the first jacket, and a liner is provided on the surface in contact with the magnetic disk similarly to the first jacket.

A magnetic disk cartridge is provided with a shutter having a U-shaped cross section so as to open and close the magnetic head insertion openings of the first jacket and the second jacket for accommodating the magnetic disks.

[0007] Such a 3.5-inch magnetic disk cartridge has been desired to have a large capacity with an increase in the amount of information to be handled.

As a method of realizing a large-capacity magnetic disk cartridge, there are a method of narrowing a track width for recording information and a method of increasing a linear recording density.

To realize this, in recent years, Co-C
r-based alloys using a vacuum process such as sputtering or vapor deposition, or magnetic powders such as Ba-ferrite coated on a support together with a binder have been developed. Has come to be realized.

[0010]

However, as described above, in a large-capacity magnetic disk cartridge, foreign matters such as fine dust, which have not been a major problem in the past, become serious problems such as dropout.

This is because the track density or the linear recording density has been improved as compared with the prior art. For this reason, a disk cartridge described in Japanese Utility Model Laid-Open No. 63-55268 is an example of a disk cartridge that minimizes the invasion of foreign matter such as dust from the outside.

This comprises a first shutter for opening or closing the magnetic head insertion opening and a second shutter for opening or closing the hub exposure opening for exposing the hub to the outside. By closing the opening normally, the intrusion of foreign matter such as dust from the outside is suppressed, and an error such as dropout is intended to be eliminated.

However, even when these disk cartridges are used, errors such as dropout of a disk cartridge having improved track density or linear recording density cannot be sufficiently eliminated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disk cartridge which eliminates errors such as dropout even if the disk cartridge has an improved track density or linear recording density. Is to do.

[0015]

A disk cartridge according to the present invention has a drive transmitting means for transmitting rotation from a driving means at a central portion thereof, an information storage means capable of recording / reproducing information, and an information storage means. Recording / playback for recording / playback
A recording / reproducing means insertion opening for bringing the reproducing means into or out of contact with the information storage means; and an exposure port for exposing the drive transmission means, wherein the information storage means is rotatable about the drive transmission means. Storage means for storing, first and second liners arranged between the storage means and the information storage means, and the storage means and the second liner for pressing the first liner against the information storage means. A lifter disposed between the first and second liners, and a state in which the information storage means can be selectively moved between the exposed / closed state through the recording / reproducing means insertion opening along the exposure window. And a fixing means for pressing and fixing the drive transmission means to the second liner side in conjunction with closing of the recording / reproducing means insertion opening of the opening / closing means.

[0016]

The present inventor uses a conventional disk cartridge,
After examining the causes of dropout in various ways, conventional disc cartridges can suppress the intrusion of foreign matter such as dust from the outside, but no consideration is given to foreign matter such as dust generated inside. Was found to be the cause.

For example, in a conventional magnetic disk cartridge or the like in which a magnetic disk is housed in a hard jacket, the magnetic disk is housed with an appropriate margin in order to house the magnetic disk rotatably in a pair of jackets. Therefore, the magnetic disk vibrates inside the pair of jackets when being carried.

Due to the vibration of the magnetic disk, the hub of the magnetic disk collides with the jacket and the like, and foreign matter such as dust is generated inside the jacket.

Foreign matter such as dust generated inside the disk cartridge causes dropout of the disk cartridge.

By adopting the above-described structure, the inventor of the present invention ensures that no foreign matter such as dust enters from outside except when the disk cartridge is used, and also that the magnetic disk is placed inside the jacket of the disk cartridge. It is possible to prevent vibration and to prevent dust generated inside.

By doing so, errors such as dropouts can be sufficiently reduced even with a large-capacity disk cartridge.

[0022]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic front view of a magnetic disk cartridge according to an embodiment of the present invention.
FIG. 2 is a schematic sectional view of the disk cartridge in FIG.

The disk cartridge (1) of this embodiment is
For example, a magnetic disk in which a hub (43) for transmitting rotation from a disk drive device (hereinafter referred to as FDD) is installed at the center by a pair of upper and lower jackets (11) and (12) formed of ABS resin. (41) is rotatably housed.

The upper jacket (11) is provided with a head insertion opening (not shown) for allowing an FDD magnetic head (not shown) to contact the magnetic disk (41).
The lower jacket (21) has a FD on the magnetic disk (41).
An opening (29) is formed to serve both as a head insertion for abutting the magnetic head of D and a hub exposure for mounting the hub (43) on the FDD.

Normally, the opening (29) and the head insertion slot are closed, and when the magnetic disk cartridge (1) is inserted into the FDD, the opening (29) and the head insertion slot are opened to open the magnetic disk (41). A shutter (31) having a U-shaped cross section is provided so as to be horizontally movable on one side of the magnetic disk cartridge (1).

As shown in FIG. 2, a convex pressure fixing portion (37) is formed on a part of the surface of the shutter (31) which comes into contact with the lower jacket (21). The shutter (31) is opened (2) by the pressure fixing portion (37) formed in the shutter (31).
9), pressing and fixing part (37) with the head insertion port closed
As a result, the hub (43) is pressed and fixed to the upper jacket (11) side, and the shutter (31) opens the opening (29) and the head insertion opening, and the pressing and fixing portion (37) formed on the shutter (31) is opened. )
Is removed from the hub (43), and the hub (43) is rotatable.

As shown in FIG. 2, the liners (18), (2) are formed of a nonwoven fabric having a size corresponding to the size of the magnetic disk (41).
8) are partially welded to the upper and lower jackets (11) and (21) on the surfaces that come into contact with the magnetic disk (41). Further, between the lower jacket (21) and the inner surface and the liner (28), for example, a metal lifter (not shown) for pressing the liner (28) toward the magnetic disk (41) is provided.

With the magnetic disk cartridge (1) having such a configuration, the magnetic disk cartridge (1) is not used except when in use.
Since (41) is pressed and fixed to the upper jacket (11) by the pressing and fixing portion (37) formed in the shutter (31), the magnetic disk (41) vibrates in the upper and lower jackets (11) and (21). It is possible to prevent dust from being generated inside. Further, as in the conventional case, the opening (29) for exposing the hub (43) is also covered with the shutter (31), so that intrusion of dust from the outside can be prevented.

Therefore, even with a magnetic disk cartridge (1) using a magnetic disk (41) having a large recording capacity, recording / reproduction could be performed with high reliability without dropout or the like.

By applying the present invention to the magnetic disk cartridge (1) as described above, the following effects can be obtained.

As described above, the hub (43) is used as the upper jacket.
By fixing to the (11) side, the magnetic disk (4
1) can also be adsorbed in the direction of the upper jacket (11).
Therefore, the magnetic disk (41) does not receive a strong pressing force from a lifter (not shown) provided on the lower jacket (21) so as to press the liner (28) against the magnetic disk (41).

Therefore, the magnetic disk cartridge (1)
, The good modulation could be obtained for a long period of time without the magnetic disk (41) being deformed by the pressing force of the lifter (not shown).

As described in detail above, in the magnetic disk cartridge (1) of this embodiment, the magnetic disk cartridge
(1) By preventing the generation of foreign matter such as dust inside and preventing the intrusion of foreign matter such as dust from the outside, dropout etc. can be eliminated for a long time, and the pressing force of a lifter (not shown) can be used. The deformation of the magnetic disk (41) can also be prevented.

Although the magnetic disk cartridge (1) has been described here as an example, the present invention can be applied to various disk cartridges such as an optical disk cartridge. (Second Embodiment) Next, as a second embodiment of the present invention,
A 3.5-inch magnetic disk cartridge will be described as an example with reference to FIG.

This is a 3.5-inch magnetic field having a pair of jackets (11) and (21) having a head insertion opening (25) and a hub (43) for transmitting rotational drive from the FDD at the center. The disk (41) is rotatably stored. And hub (4
3) is exposed from a hub exposure port (28) formed in the lower jacket (21).

Further, a pair of jackets (11) and (21)
A first shutter (31) having a U-shaped cross section is provided so that the head insertion opening (25) can be freely opened and closed on one side of the shutter. At one end of the first shutter (31), a trailing piece (31a) that is partially extended in the moving direction of the shutter (31) is formed.

The hub exposure port (28) is composed of a tip (33a) and a sector (33b) rotatable about the rotation shaft (35) on the surface of the lower jacket (21) so as to be openable and closable. A fan-shaped second shutter (33) is provided, and a connection groove (36) formed in a tapered portion (33a) of the second shutter (33) is connected to the first shutter (31). The pieces (31a) are connected. Further, when the hub exposure port (28) is closed as in the first embodiment,
The lower jacket (21) is attached to the sector (33b) of the second shutter (33) so that the hub (43) is pressed and fixed to the upper jacket (11).
A pressing fixing portion (37) protruding from is formed.

Next, the operation of the magnetic disk cartridge (1) will be described. In this magnetic disk cartridge, the head insertion slot (25) is covered with a first shutter (31) normally pressed to one end by the urging force of a spring (not shown), and foreign matter such as dust enters from the outside. Preventing. In this state, the taper of the second shutter (33) (3
3a) is pressed outward of the lower jacket (21) by the connection piece (31a) connected to the connection groove (36). For this reason, while the second shutter (33) is rotated about the rotation axis (35), the hub exposure port (28) is covered by the fan-shaped portion (33b), and the second shutter (33) is provided in the fan-shaped portion (33b). The hub (43) is pressed and fixed by the pressed fixing portion (37).

The magnetic disk cartridge (1)
When the is mounted on the FDD, the first shutter (31) moves on the upper and lower jackets (11) and (21) in a direction to expose the head insertion opening (25) by a pin (not shown) provided on the FDD. I do. With this movement, the connecting piece (31a) provided in the first shutter (31) also moves. And the second shutter (33)
The taper (33a) of the connection piece (3a) is moved by the movement of the connection piece (31a).
It receives a tensile force in the moving direction of 1a) and rotates around the rotating shaft (35) in the direction of opening the hub exposure port (28).

In this embodiment, even with a 3.5-inch disk cartridge (1), two types of shutters (3
By successfully combining (1) and (33), the first shutter
The hub exposure port (28) can be opened and closed in conjunction with the opening and closing of (31).

With the above configuration, the magnetic disk cartridge (1) can be mounted on the FD as in the first embodiment.
When the magnetic disk cartridge (1) is not mounted on the magnetic disk cartridge (1), the inside and outside of the magnetic disk cartridge (1) are completely shut off by the first shutter (31) and the second shutter (33). 1) It is possible to prevent foreign substances such as dust from entering the inside. Furthermore, the magnetic disk (41)
Are fixed inside the upper and lower jackets (11) and (21),
There is no generation of foreign matter such as dust inside. For this reason, even if the disk cartridge has a large recording capacity, errors such as dropout can be eliminated for a long period of time.

When the magnetic disk cartridge (1) is not used, the magnetic disk (41) is placed on the upper jacket (11).
Side, the magnetic disk receives an excessive pressing force from a lifter (not shown) as in the first embodiment.
(41) is not deformed and does not adversely affect the modulation.

This embodiment is merely an embodiment of the present invention. In addition, a solid lubricant such as molybdenum disulfide is applied to the surface of the hub (43) and the pressing and fixing portion (3) of the second shutter (33).
5) and the like, sliding of the second shutter (33) and the lower jacket (21), or sliding of the second shutter (33) and the hub (43) can remove dust and the like. The generation of foreign matter can be prevented.

Similarly, when the pressing and fixing portion (37) formed on the second shutter (33) moves on the surface of the lower jacket (21), foreign matter such as dust generated on the surface of the lower jacket (21) is moved. This can be prevented by forming a groove along the movement of the pressing and fixing portion (37).

In this embodiment, a first shutter (31) for opening and closing the head insertion opening (25) and a second shutter (33) for opening and closing the hub exposure opening (28) are connected. Although an example in which the invention is applied to a 3.5-inch size magnetic disk cartridge has been described, the present invention is not limited to this and can be applied to various disk cartridges.

[0047]

As described above, according to the present invention, the vibration of the information recording means is prevented, thereby preventing the generation of foreign matter such as dust inside the disk cartridge.
A disk cartridge capable of performing recording / reproduction with high reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a magnetic disk cartridge according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of the magnetic disk cartridge shown in FIG.

FIG. 3 is a schematic front view of a disk cartridge according to a second embodiment of the present invention.

[Explanation of symbols]

 (1)… Magnetic disk cartridge (12)… Upper jacket (21)… Lower jacket (31)… Shutter (37)… Press fixing part (41)… Magnetic disk

Claims (3)

(57) [Claims] 1. An information storage means having a drive transmission means for transmitting rotation from a drive means at a central portion and capable of recording / reproducing information, and a recording / reproduction means for performing recording / reproduction on said information storage means. A recording / reproducing means insertion port for approaching or contacting the information storage means, and an exposure port for exposing the drive transmission means, and the information storage means is rotatably housed around the drive transmission means. a storage unit, the information storage between said housing means and the information storage means
First and second liners arranged with means interposed therebetween; a lifter arranged between the storage means and the first liner to press the first liner toward the information storage means; Opening / closing means movably provided along the exposure window so that the information storage means can be selectively exposed or closed from the recording / reproducing means insertion slot; and The pressing force that the information storage means receives from the lifter in conjunction with the closing of the reproduction means insertion port is reduced.
And a fixing means for pressing and fixing said drive transmission means to said second liner side so as to be weakened . 2. The fixing means according to claim 1, wherein
Including a protruding pressing and fixing portion formed integrally with the step.
Characterized disk cartridge. 3. A fixing means and a drive transmitting means according to claim 1.
Is characterized by being contacted via a lubricating layer.
Disc cartridge.