JPS6325552Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic disk cartridge, and in particular, unlike a flexible magnetic disk cartridge, the present invention is a magnetic disk cartridge in which a magnetic disk is rotatably housed in a case made of a synthetic resin molded product. Regarding disk cartridges.

As this kind of magnetic disk cartridge,
A magnetic disk cartridge is known in which a magnetic disk is rotatably housed in a PVC sheet jacket, but since the jacket is made of a PVC sheet, its mechanical strength is weak, and the magnetic disk may be damaged by bending. easy to invite. Therefore, a magnetic disk cartridge has been proposed in which the rectangular case that houses the magnetic disk is molded from synthetic resin such as ABS resin to improve mechanical strength.

However, when using a magnetic disk cartridge using a case molded from synthetic resin, the magnetic disk tends to come into sliding contact with the inner surface of the cartridge case, resulting in damage to the magnetic disk.

In order to prevent such accidents, it is conceivable to interpose an inner sheet made of non-woven fabric between the inner surface of the case and the magnetic disk, as is used in PVC sheet jackets, but conventional PVC sheet jackets As shown in the figure above, it is not possible to punch out the drive shaft opening and head insertion slot in the inner sheet at the same time as punching out the drive shaft opening and head insertion slot in the jacket. A method must be adopted in which a stamped inner sheet is loaded into the case.

However, at this time, the head insertion port is formed as a long hole punched radially from the vicinity of the central drive shaft opening to the outer periphery of the inner seat, so the seat rotates when inserted into the case. The seat moves and is not regulated to the specified position,
There were cases where the case head insertion slot and the seat head insertion slot were not aligned and were assembled.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art and to provide a magnetic disk cartridge that allows the head insertion opening of the case and the head insertion opening of the inner sheet to be easily and reliably aligned.

To achieve this objective, the present invention has a case with a side wall around the periphery, a drive shaft opening for rotating the magnetic disk contained therein from the outside, and a head insertion slot for recording and reproducing. The disk is rotatably housed, and an inner sheet is interposed between at least one of the inner surfaces of the case and the magnetic disk, and the inner sheet has a drive shaft opening and a head insertion hole formed therein in correspondence with the drive shaft opening and head insertion hole of the case. In the magnetic disk cartridge according to the present invention, ribs connected to the side walls of the case protrude from at least the corners on both sides of the head insertion opening on the inner surface of the case, and the outer shape of the inner sheet is shaped like the side walls of the case and the ribs connected thereto. The inner sheet is characterized in that the position of the inner sheet is regulated to have almost the same shape as the shape surrounded by the shape.

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 are diagrams for explaining the embodiment.

A case 2 that accommodates the magnetic disk 1 is composed of an upper case 3 and a lower case 4 of almost the same shape, and these cases 3 and 4 are molded from synthetic resin such as ABS resin, and each has a side wall 5 on its outer periphery. ing. Furthermore, a circular drive shaft opening 6 for rotating the magnetic disk 1 from the outside is formed approximately in the center of the cases 3 and 4, and a head into which a magnetic head is inserted for recording and playback is formed outside the opening 6. An insertion opening 7 and an index hole 8 for correct tracking are provided. The upper case 3 and the lower case 4 are joined so that their side walls 5 are in contact with each other, and both cases 3 and 4 are connected together by appropriate means such as screws or ultrasonic welding to form the case 2. .

Magnetic disk 1 housed in this case 2
As shown in FIG. 3, the base film 9 is made of a polyester film or the like, with a thin magnetic layer 10 coated on one or both sides, and is punched out into a disk shape as shown in FIG. . A drive shaft insertion hole 11 having a smaller diameter than the drive shaft opening 6 of the case 2 is formed in the center of the magnetic disk 1, and the inner circumference of the magnetic disk 1 exposed through the drive shaft opening 6 is used for recording. A magnetic disk 1 is configured to rotate within a case 2 by being chucked to a drive shaft of a playback device.

As shown in FIGS. 4 and 5, the upper case 3
On the inner surface of the lower case 4, on both sides of the head insertion opening 7, on the side opposite to the head insertion opening 7 through the drive shaft opening 6, and at intermediate positions between these and both sides of the head insertion opening 7, A regulating protrusion 12 is formed extending from the side wall 5 to the drive shaft opening 6. The regulating protrusions 12 of the upper case 3 and the regulating protrusions 12 of the lower case 4 are provided with positions slightly shifted from each other. Therefore, when both cases 3 and 4 are joined, the upper The regulating protrusions 12 of the case 3 and the regulating protrusions 12 of the lower case 4 are alternated, and the magnetic disk 1 is interposed between the upper and lower regulating protrusions 12, and the regulating protrusions 12 prevent the rotation of the magnetic disk 1. The fluttering associated with this is suppressed. In addition, the height of each regulating protrusion 12 is different from cases 3 and 4.
It is designed to be lower than the side wall 5 of the magnetic disk 1 to an extent that allows rotation of the magnetic disk 1, and the tip of the regulating protrusion 12 is rounded to prevent the magnetic disk 1 from being damaged.

As shown in FIG. 6, the inner sheet 13 from which the parts facing the drive shaft opening 6a, the head insertion port 7a, and the index hole 8a of the cases 3 and 4 are removed is attached to the upper case 3 and the lower case 4. It is placed on the regulating protrusion 12 and fixed in a stretched state by appropriate means such as adhesion or fusion. The inner sheet 13 is made of, for example, a synthetic resin sheet made of a synthetic resin such as fluororesin or polyester alone or mixed with a solid lubricant such as phosphorous graphite, or a nonwoven fabric.

In this case, a connecting portion 1 is provided at the inner corner of the upper case 3 and the lower case 4 to connect both cases 3 and 4 together.
4, and arcuate ribs 15a, 15b, 15c, 15d that surround the connecting portion 14 and connect with the side walls 5a, 5b, 5c, 5d, respectively.
are formed, and the outer shape of the inner sheet 13 has cutouts 16a, 16b, 16c, 16 at the four corners.
d is formed and has almost the same shape as that surrounded by the side walls 5a, 5b, 5c, and 5d and the arcuate ribs 15a, 15b, 15c, and 15d.

Therefore, the drive shaft opening 6b, head insertion port 7b, and index hole 8b of the inner sheet 13 are connected to the drive shaft opening 6b of the cases 3 and 4.
a. When the inner sheet 13 is inserted into the cases 3 and 4 so that the head insertion opening 7a and the index hole 8a correspond to each other, the side walls 5a, 5b,
5c, 5d and arcuate ribs 15a, 15b, 15
The shape surrounded by c and 15d and the outer shape of the inner sheet 13 are substantially the same and match, and the inner sheet 13 can be properly inserted into the case, and until the inner sheet 13 is fixed inside the case. The positions of the inner sheet 13 and the case 3 are controlled by the side walls 5a, 5b, 5c, 5d and the arcuate ribs 15a, 15b, 15c, 15d.
It is possible to prevent the head insertion openings 7b and 7a of No. 4 from being mismatched.

In this case, the notch 16 of the inner sheet 13
All four corners of a, 16b, 16c, and 16d are not necessarily required, but two notches 16a and 16b located on both sides of the head insertion opening 7b are used.
It is sufficient to form the rib portions 15a, 15b of the cases 3, 4 corresponding to the cut portions 16a, 16b.

As described above, in the magnetic disk cartridge of the present invention, ribs connected to the side walls of the case are projected from at least the corners on both sides of the head insertion slot on the inner surface of the case, and the outer shape of the inner sheet is adjusted to the side wall of the case. Since the shape is substantially the same as that surrounded by the rib shape connected thereto, it is possible to reliably prevent misalignment between the head insertion opening 7a of the case and the head insertion opening 7b of the inner sheet.

[Brief explanation of drawings]

All the figures are for explaining the embodiment of the present invention, and FIGS. 1 and 2 are a plan view and a side view of the magnetic disk cartridge according to the first embodiment, and FIG. 3 is an enlarged view of the magnetic disk. 4 and 5 are plan views showing the inner surface of the case before the inner sheet is fixed to the magnetic tape cartridge; FIG. 6 is a plan view of the inner sheet; and FIGS. 7 and 8. 9 is a plan view showing the inner surface state of the case after the inner sheet is fixed.
The figure is an enlarged sectional view of the main part of the magnetic tape cartridge. 1...Magnetic disk, 2...Case, 3...Upper case, 4...Lower case, 5...Side wall, 6a, 6
b...Opening for drive shaft, 7a, 7b...Insertion port for head, 12...Regulating protrusion, 13...Inner sheet, 15a, 15b, 15c, 15d...Circular rib, 16a, 16b, 16c, 16d...Notch, R...Rotation direction of the magnetic disk.

Claims (1)

[Scope of utility model registration request] A magnetic disk is rotatably housed in a rectangular case having a side wall around the periphery, a drive shaft opening for externally rotating the housed magnetic disk, and a head insertion hole for recording and reproducing. In a magnetic disk cartridge, an inner sheet is interposed between one of the inner surfaces of the case and the magnetic disk, the inner sheet having a drive shaft opening and a head insertion port formed in correspondence with the drive shaft opening and head insertion port of the case, Ribs connected to the side walls of the case are protruded from at least the corners on both sides of the head insertion opening on the inner surface of the case, and the outer shape of the inner sheet is surrounded by the side walls of the case and the ribs connected thereto. A magnetic disk cartridge characterized by having almost the same shape.