JP2000021119A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge that prevents dust and dirt from entering the cartridge, and does not cause software and hardware errors. SOLUTION: A lower liner 13b for protecting a magnetic sheet 2 is formed by allowing a part with specific width of an inner periphery to project. Then, the projection part faces the side of the magnetic sheet 2 (an upper part), and the tip is applied onto the inner surface of a lower shell 1b of a cartridge so that the tip is brought into contact with the magnetic sheet 2, thus preventing rubbish such as dust and dirt from adhering to the magnetic sheet 2 even when the magnetic sheet 2 is placed at any positions (a)-(d), and hence preventing a software error from being induced since the head of a drive-driving part 10 cannot read any data on recording and reproduction. Also, the surface of the magnetic sheet is not damaged via the dust and dirt, thus preventing a hardware error for disabling recording and reproduction from being generated, and hence greatly improve the reliability of quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk cartridge for a magnetic recording / reproducing apparatus for recording data in a computer or the like.

[0002]

2. Description of the Related Art A floppy disk used as a data recording medium, for example, a 3.5-inch floppy disk is constructed as shown in FIG. In FIG.
Reference numerals a and 1b denote a pair of upper and lower shells (upper shell) and lower shell (lower shell) obtained by injection-molding a synthetic resin.

On the inner surfaces of the shells 1a and 1b, a liner made of nylon, rayon or polyester fiber alone or a non-woven fabric is used to prevent scratches on the magnetic sheet 2 whose central part is punched in a disk shape. 3a and 3b are pasted. Upper liner 3a and lower liner 3
The shape of b is the same.

The reference numeral 4 provided at the center of the magnetic sheet 2
A center core as a mechanism for chucking a recording / reproducing device (drive driving unit). The center core 4 is formed in a cylindrical shape with a bottom by a magnetic metal plate, and one surface of the bottom plate serves as a reference surface supported on a disk table of a drive device, and is opposite to the bottom plate. A flange 4 a for joining the magnetic sheet 2 with an adhesive 5 is provided on the outer peripheral edge of the cylindrical side. And the bottom plate of the center core 4 (reference surface)
Has a structure facing the outside from a hole 1c opened at the center of the lower shell 1b.

Incidentally, reference numeral 6 denotes a shutter, 7 denotes a shutter spring,
Reference numeral 8 denotes a write protector. The appearance of the assembled disk cartridge is as shown in FIG.

[0006]

In the structure of the floppy disk constructed as described above, a gap is formed between the center core 4 and the hole 1c opened substantially at the center of the lower shell 1b. In this case, since the magnetic sheet 2 rotates at high speed, dust and dust may be caught in the disk from the gap and adhere to the magnetic sheet surface on the lower shell 1b side. Even when not in use (such as on a desk), dust and dirt easily enter.

Here, the manner in which the dust and dust enter will be described in detail with reference to FIG. FIG. 6 shows a cross section taken along the line BB of FIG. 5, where 10 is a drive drive unit of the recording / reproducing apparatus, and other parts that are the same as those in FIG.

FIG. 6A shows a state in which a floppy disk is used. The magnetic sheet 2 is located almost at the center between the upper liner 3a and the lower liner 3b and rotates at a high speed.
At this time, the hole 1c between the lower shell 1b and the center core 4
Dust 11 such as dust and dirt intrudes through the gap, is caught by high-speed rotation, and adheres to the surface of the magnetic sheet 2 on the lower shell 1b side.

When the floppy disk is not used, even when the magnetic sheet 2 is at a position in contact with the upper liner 3a as shown in FIG. Dust 11 such as dust enters and attaches to the surface of the magnetic sheet 2 on the lower shell 1b side.

When the floppy disk is placed on a desk or the like, as shown in FIG.
Also, when it is located almost in the middle between the lower liner 3a and the lower liner 3b, dust 11 such as dust and dirt intrudes from the gap of the hole 1c between the lower shell 1b and the center core 4, and adheres to the surface of the magnetic sheet 2 on the lower shell 1b side. .

Further, even when the magnetic sheet 2 is at a position in contact with the lower liner 3b as shown in FIG.
Dust 11 such as dust enters and attaches to the surface of the magnetic sheet 2 on the lower shell 1b side.

If dust 11 such as dust and dirt adheres to the surface of the magnetic sheet 2 as described above, it becomes impossible to read the data with the head of the drive at the time of recording and reproduction, causing a soft error, If you take the drive in and out with dust attached, the drive head will damage the magnetic sheet surface with dust and dirt interposed.
This causes a hard error that makes recording and reproduction impossible, and has a great effect on the reliability of quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a disk cartridge which prevents dust and dirt from entering the cartridge and does not induce a soft error or a hard error. It is in.

[0014]

(1) In order to solve the above-mentioned problems, according to the present invention, one end of a cylindrical body is closed by a bottom plate, and a flange is formed on the outer peripheral edge of the other end of the cylindrical body. A disc in which a center core and a disc-shaped recording medium joined to a flange of the center core are housed in a cartridge such that a bottom plate of the center core is positioned in a center hole provided in a plane plate for housing. The cartridge further comprises a protection sheet disposed between the recording medium and the flat plate for storage provided with the central hole, the protection sheet having an inner peripheral portion protruding toward the recording medium. The inner peripheral portion of the sheet is formed so as to be in contact with a non-recording area of the recording medium.

(2) In the first aspect of the present invention, the recording medium may be an innermost surface portion of the storage flat plate (upper shell) on the side where the central hole is not provided in the cartridge (the arrangement of the protective sheet). When the protective sheet is located farthest from the installation position), the inner peripheral portion of the protective sheet protrudes toward the recording medium, so that the gap between the inner peripheral end and the recording medium is extremely small. Therefore, even if dust and dirt enter the gap between the center hole of the flat plate for storage (lower shell) and the center core, the dirt and dust hardly enter the recording area of the recording medium.

Further, the recording medium is located at an intermediate portion or substantially an intermediate portion in the cartridge, or at an innermost portion (a portion in contact with the protective sheet) of the storage flat plate (lower shell) on the side where the central hole is provided. Then, the protruding inner peripheral portion of the protective sheet comes into contact with the non-recording area on the inner peripheral side of the recording medium. For this reason, even if dust, dirt, etc. enter through the gap between the center hole of the flat plate for storage and the center core,
The dust and dust do not enter the recording area of the recording medium, and the dust and dust do not adhere to the recording surface.

(3) In the second aspect of the present invention, the recording medium may be formed such that the innermost portion of the storage flat plate on the side where the central hole is not provided in the cartridge, the middle portion in the cartridge, or substantially the same. The middle part, or when located at the innermost part of the storage flat plate on the side where the center hole is provided, that is, even when the recording medium is located at any part in the cartridge, the inner peripheral part of the protective sheet is Contact with non-recording area of recording medium. For this reason, even if dust and the like enter the gap between the center hole and the center core of the storage flat plate, the dust and the dust do not enter the recording area of the recording medium, and the dust and the dust adhere to the recording surface. Never.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. In the present invention, in order to solve the above-mentioned problem, the inner edge of the lower liner (protective sheet) is brought into contact with the inner non-recording area of the magnetic sheet to eliminate the gap, and the hole opened in the center of the lower shell is removed. The structure prevents dust and dirt from entering.

In order to realize this structure, the shape of the conventional lower liner 3b as shown in FIG. 7 is changed to the shape shown in FIG. Change to liner 13b. Thus, the lower liner 13
As a method of forming b into a shape in which the inner peripheral portion is protruded, a hot press is used, and the inner edge portion of the lower liner is heated and deformed.

That is, as shown in FIG. 2, the lower liner before processing is substantially engaged between the female mold 20a and the male mold 20b having a built-in heat heater (FIG. 2 (a)). Then, by pressing while heating as shown in FIG. 2B, the lower edge of the lower liner 13 in which the inner edge portion of the liner protrudes from the other portion.
b is obtained as shown in FIG.

The lower liner 13 thus manufactured
In FIG. 3, b is attached to the inner surface of the lower shell 1b of the cartridge such that the protrusion faces the magnetic sheet 2 (upward) as shown in FIG. This can prevent dust such as dust and dust from adhering to the magnetic sheet 2.

That is, FIG. 3A shows a state in which a floppy disk is used, and the magnetic sheet 2 has an upper liner 3a.
And the lower liner 13b, and rotates at a high speed. At this time, the lower shell 1b and the center core 4
Even if dust 11 such as dust or dirt enters through the gap between the holes 1c, the inner peripheral side protruding portion of the lower liner 13b prevents the magnetic sheet 2 from adhering to the recording surface.

When the floppy disk is not used, even when the magnetic sheet 2 is at a position where it contacts the upper liner 3a as shown in FIG. 3B, the magnetic sheet 2 can be removed from the gap of the hole 1c between the lower shell 1b and the center core 4. Even if dust 11 such as dust enters, the inner peripheral projection of the lower liner 13b prevents the magnetic sheet 2 from adhering to the recording surface.

When the floppy disk is placed on a desk or the like, as shown in FIG. 3 (c), the magnetic sheet 2 may be located almost in the middle between the upper liner 3a and the lower liner 13b.
Even if dust 11 such as dust and dirt intrudes from the gap of the hole 1c between the lower shell 1b and the center core 4, the lower peripheral liner 13b prevents the magnetic sheet 2 from adhering to the recording surface even if it enters.

Further, even when the magnetic sheet 2 is at a position where it contacts the lower liner 13b as shown in FIG. 3D, dust 11 such as dust and dirt enters through the gap between the hole 1c between the lower shell 1b and the center core 4. Even lower liner 13
The inner peripheral side protrusion b prevents the magnetic sheet 2 from adhering to the recording surface.

As described above, dust 11 such as dust and dirt does not adhere to the surface of the magnetic sheet 2, so that the read operation by the head of the drive drive unit 10 cannot be performed at the time of recording / reproducing, thereby causing a soft error. Never. In addition, since the magnetic sheet surface is not damaged by dust and dust, there is no possibility of a hard error that makes recording and reproduction impossible. Therefore, the reliability of quality is significantly improved.

The tip of the projecting portion of the lower liner 13b is configured to always contact the magnetic sheet 2 regardless of the position of the magnetic sheet 2 in the cartridge. However, the present invention is not limited to this. As an example of the embodiment, the inner peripheral side protruding portion of the lower liner may be formed higher on the magnetic sheet side than the portions corresponding to the recording areas of the magnetic sheet on the center side and the outer peripheral side.

When formed in this manner, the magnetic sheet 2
However, when the upper liner 3a is at the upper limit position where it comes into contact with the upper liner 3a as shown in FIG. 3 (b), the tip of the inner peripheral side protruding portion of the lower liner does not come into contact with the magnetic sheet. Garbage such as dust and dirt is hard to enter.

The magnetic sheet 2 is shown in FIG.
In the positions shown in (c) and (d), the tip of the inner peripheral side protruding portion of the lower liner comes into contact with the magnetic sheet 2 in the same manner as described above, so dust such as dust and dust does not adhere to the magnetic sheet 2. .

Accordingly, also in this embodiment, the same effect as that described above is obtained that dust and dirt are prevented from adhering to the magnetic sheet 2 and soft errors and hard errors are not induced.

The present invention is not limited to a 3.5-inch floppy disk, but can be applied to other disk cartridges. In this case, the same effects as described above can be obtained.

[0032]

As described above, according to the present invention, the following excellent effects can be obtained. (1) According to the first aspect of the present invention, a recording medium comprises:
When the protective sheet is located at the innermost surface of the upper flat plate for storage in the cartridge, the inner peripheral portion of the protective sheet protrudes toward the recording medium. . For this reason, even if dust and the like enter through the gap between the center hole of the lower flat plate for storage and the center core, the dust and the dust hardly enter the recording area of the recording medium.

When the recording medium is located at an intermediate portion or substantially an intermediate portion in the cartridge, or at the innermost portion of the lower flat plate for storage, the protruding inner peripheral portion of the protective sheet is provided on the recording medium. Touches the non-recording area on the inner circumference side of. For this reason, even if dust and the like enter through the gap between the center hole of the lower flat plate for storage and the center core,
Dust does not enter the recording area of the recording medium, and dust and dirt do not adhere to the recording surface.

Therefore, the occurrence of soft errors and hard errors can be reduced, the reliability of quality can be improved, and the development of a large-capacity floppy disk of 100 MB or more can be contributed.

(2) According to the second aspect of the present invention,
When the recording medium is located at the innermost surface of the upper flat plate for storage, at the intermediate portion, or almost at the intermediate position in the cartridge, or at the innermost portion of the lower flat plate for storage in the cartridge, that is, in the cartridge, Regardless of where the recording medium is located, the inner peripheral portion of the protective sheet contacts the non-recording area of the recording medium. Therefore, even if dust and the like enter the gap between the center hole and the center core of the lower flat plate for storage, the dust and the dust do not enter the recording area of the recording medium, and the dust and dust are recorded on the recording surface. Will not adhere.

Therefore, the occurrence of soft errors and hard errors can be reduced, the reliability of quality can be improved, and it is possible to contribute to the development of a large-capacity floppy disk of 100 MB or more.

[Brief description of the drawings]

FIGS. 1A and 1B show a main part of an embodiment of the present invention, wherein FIG. 1A is a plan view of a lower liner, and FIG.

FIG. 2 is a process chart of forming a lower liner according to an embodiment of the present invention.

FIG. 3 shows an embodiment of the present invention and is an explanatory diagram of an operation in each state.

FIG. 4 is an exploded configuration diagram of a conventional disk cartridge.

FIG. 5 is a completed view of a conventional disk cartridge.

FIG. 6 is an operation explanatory diagram in each state of the conventional disk cartridge.

FIG. 7 is a plan view of a conventional lower liner.

[Explanation of symbols]

 1a Upper shell 1b Lower shell 1c Hole 2 Magnetic sheet 3a Upper liner 3b, 13b Lower liner 4 Center core 10 Drive drive unit 11 Dust

Claims (2)

[Claims] 1. A center core having one end closed by a bottom plate and a flange formed at the outer peripheral edge of the other end of the cylinder, and a disk-shaped recording medium joined to the flange of the center core. Wherein the bottom surface plate of the center core is housed in the cartridge such that the bottom plate is located in the center hole provided in the flat plate for housing, wherein the recording medium and the storage flat provided with the center hole are provided. A disk cartridge, comprising: a protective sheet provided between a face plate and an inner peripheral portion protruding toward a recording medium. 2. The disk cartridge according to claim 1, wherein an inner peripheral portion of the protection sheet is formed so as to contact a non-recording area of the recording medium.