JPH10302432A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge capable of preventing a disk-like recording medium from damaging due to acute angle parts formed on inner surface of shells. SOLUTION: This disk cartridge is provided with a case 3 constituted of an upper shell 1 and a lower shell 2, a magnetic disk 4 capable of recording/ reproducing which is freely rotatebly housed in the case 3, and a center core 5 firmly fixed to a center part of the magnetic disk 4, then plural semispherical protrusions 14a for protecting the magnetic disk are formed on the inner surfaces of the lower shell 2 and the upper shell 1. By these protrusions 14a for protecting the magnetic disk, the contact between the acute angle parts such as molding flashes, or flashes on the outer peripheral parts of ejector pin mark, etc., and the magnetic disk 4 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge in which a disk-shaped recording medium is housed in a case composed of an upper shell and a lower shell, and more particularly to a disk cartridge in which the disk-shaped recording medium is prevented from being damaged.

[0002]

2. Description of the Related Art FIG. 4 is a schematic sectional view showing a state in which a conventional disk cartridge containing a magnetic disk is mounted on a disk drive. This disk cartridge has a case 3 composed of an upper shell 1 and a lower shell 2.
And a recordable / reproducible magnetic disk 4 rotatably housed in a case 3, and a center core 5 fixed to the center of the magnetic disk 4. It should be noted that illustrations of other components such as an opening facing a recording / reproducing head and a shutter closing the opening are omitted. A liner 6 made of a non-woven fabric or the like is attached to the inside of each of the upper shell 1 and the lower shell 2.

When a disk cartridge is inserted into a disk drive in order to perform recording / reproduction on the magnetic disk 4, a rotating shaft 7 of a drive motor of the disk drive is rotated.
The center core 5 is inserted into the hole 8 on the bottom surface of the center core 5 on the disk cartridge side, and the center core 5 is attracted by the magnet 10 embedded in the chucking mechanism 9. Thus, when the disk cartridge is fixed to the reference plane,
The magnetic disk 4 is located substantially at the center of the case 3 in the thickness direction. When the rotating shaft 7 rotates, the lifter 1
The liner 6 pushed up by the ribs 1 and the ribs 12 comes into contact with the magnetic disk 4, wipes off dust on the surface of the magnetic disk 4 and generates an appropriate disk sliding torque as the magnetic disk 4 rotates.

[0004] By the way, with the progress of multimedia in recent years, image and audio data handled by computers and the like have been diversified, and the amount of data has been enormous. Therefore, even in the above-described disk cartridge,
In order to increase the recording capacity, high-density recording is demanded.

[0005] In a disk cartridge that meets such a demand, high-density recording is realized by setting the rotational speed of a magnetic disk of a disk drive device to several times to several tens times the conventional rotational speed. For this reason, the liners adhered to the inside of the upper shell and the lower shell may come into contact with the magnetic disk rotating at high speed, thereby damaging the surface of the magnetic disk and deteriorating the durability. Further, even when the magnetic disk and the liner are not in contact with each other during the rotation of the disk, the liner ((laminar flow)) of air generated on the surface of the magnetic disk is disturbed by the liner due to the high speed rotation of the magnetic disk, and In such a case, there is a possibility that the disk surface deflection (fluttering) may increase and the accuracy of magnetic recording / reproduction may deteriorate, so in order to realize stable high-speed rotation of the magnetic disk, a disk without a liner and a lifter in the case is provided. A cartridge (hereinafter referred to as a no-liner disk cartridge) has also been proposed.

Meanwhile, in the manufacturing process of the upper shell and the lower shell, sharp burrs are formed on the inner surfaces thereof, such as molding burrs and traces 13 of ejector pins (pins for taking out molded products from a mold) as shown in FIG. Often. A burr 13a protrudes from the outer periphery of the ejector pin mark 13 in the shell thickness direction. Therefore, when the no-liner disk cartridge is used, that is, when it is rotationally driven by the disk drive device, the center core is located substantially in the center of the case, and the magnetic disk is kept substantially horizontal by high-speed rotation. Therefore, the magnetic disk does not come into contact with the above-mentioned acute angle portion, but there is a risk that the magnetic disk will come into contact with the acute angle portion as described below during non-use such as storage or transportation of the disk. .

FIG. 6 is a schematic sectional view showing a conventional no-liner disk cartridge. When the disk cartridge is not used, the center core 5 is in a free state in the case 3, so that the lower shell 2 is not used as shown in FIG.
6B, or as shown in FIG. 6 (b), comes into contact with the upper shell 1 or the acute angle portion such as the ejector pin mark 13 or the molding burr formed on the inner surface of the upper shell 1 or the lower shell 2. There is a fear. Further, as shown in FIG. 6C, when the rotation of the disk cartridge in the disk drive is stopped, the outer peripheral portion of the magnetic disk 4 has its own weight even if the center core 5 is located at the center of the case 3. Deflection by
There is a risk of contacting the ejector pin traces 13 formed on the inner surface of the lower shell 2 and the sharp corners such as molding burrs.

[0008] As described above, in a disk cartridge that enables stable high-speed rotation by not providing a liner in the case and achieves high-density recording, the magnetic disk has an ejector pin mark formed on the inner surface of the shell or a molded disk. A new problem that the magnetic disk is damaged due to contact with an acute angle portion such as a burr, and accurate data recording / reproduction cannot be performed occurs. These sharp corners (burrs) can be separately removed by mechanical processing such as grinding and polishing, but there are problems such as an increase in the number of manufacturing steps and an increase in mechanical equipment.

[0009]

Therefore, the problem to be solved by the present invention is that a disc-shaped recording medium is brought into contact with an ejector pin trace formed on the inner surface of a shell or an acute angle portion such as a molding burr. An object of the present invention is to provide a disk cartridge capable of preventing damage to a recording medium.

[0010]

In order to solve the above-mentioned problems, a disk cartridge according to the present invention comprises a case composed of an upper shell and a lower shell, and a disk-shaped recording medium rotatably stored in the case. , Wherein the upper shell and the lower shell each have a plurality of disk-shaped recording medium protection projections, each of which has a curved surface facing the disk-shaped recording medium.

The projection for protecting the disk-shaped recording medium is constituted by a hemispherical projection, a semi-spindle-shaped projection, a plate-shaped projection having a semicircular side surface, or the like. Further, it is desirable that the height of the disk-shaped recording medium protecting projection is greater than the height of the acute angle portion on each of the opposing surfaces of the upper shell and the lower shell. Here, the acute angle portion refers to ejector pin marks, molding burrs, and the like generated when the upper shell and the lower shell are formed.

According to the disk cartridge of the present invention,
When the disk cartridge is not used, the center core to which the disk-shaped recording medium is fixed is in a free state, and even if the disk-shaped recording medium moves in the thickness direction in the case, the disk-shaped recording medium remains in the disk-shaped state. The contact with the recording medium protecting projection restricts the movement of the projection, and prevents the contact with the acute angle portions formed on the opposing surfaces of the upper shell and the lower shell. In addition, the disk-shaped recording medium protecting projection ensures that the disk-shaped recording medium directly contacts the opposing surface of the upper shell or the lower shell even in a disk cartridge having no acute angle portion on the opposing surface of the upper shell and the lower shell. To prevent

Further, the contact area with the disk-shaped recording medium is reduced by forming the disk-shaped recording medium protecting projections from hemispherical projections, semi-spindle-shaped projections, or plate-shaped projections having a semicircular side shape. As a result, damage to the disk-shaped recording medium can be prevented. The disk-shaped recording medium protecting projection is formed in advance in a molding die with a concave portion having a shape corresponding to that of the molding die, and can be integrally molded at the time of resin molding.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. Here, the disk cartridge of the present invention will be described as applied to an MFD (micro floppy disk: trade name) containing a 3.5-inch diameter magnetic disk as a disk-shaped recording medium. Note that components in the drawing that have the same structure as the conventional technology are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a view showing an embodiment of a disk cartridge according to the present invention. FIG. 1 (a) is a schematic sectional view, FIG. 1 (b) is a plan view showing the inner surface side of a lower shell, and FIG. (C) is an enlarged sectional view of the magnetic disk protection projection.
This disc cartridge is formed by applying a magnetic material to both sides of a case 3 composed of an upper shell 1 and a lower shell 1 formed by resin molding and a polyester base material and rotatably stored in the case 3. And a center core 5 fixed to the center of the magnetic disk 4, and no liner is provided inside the case 3.

The inner surface of the lower shell 2, that is, the upper shell 1
A plurality of hemispherical magnetic disk protection projections (hereinafter abbreviated as protection projections) 14a are provided on the surface facing
It is integrally molded at the position shown in FIG. The protection projection 14a is for preventing contact between the magnetic disk 4 and an acute angle portion such as a molding burr generated when a shell is formed or a burr 13a on an outer peripheral portion of the ejector pin mark 13. As shown in FIG. 1C, the height h1 of the protection projection 14a is determined by the burr 13a on the outer peripheral portion of the ejector pin mark 13.
Is set higher than the height h2. Further, the formation position and the number of the protection projections 14a depend on the formation position and the number of the ejector pin marks 13, and as shown in FIG. 1A, even if the outer peripheral portion of the magnetic disk 4 is bent due to its own weight. Is set so as not to contact the ejector pin mark 13. FIG. 1B illustrates an example of the lower shell 2, and the formation position and the number of the protection protrusions 14 a are not limited thereto. Although not shown, the upper shell 1
Similarly, a plurality of protective projections are formed on the inner surface at positions corresponding to the positions where the ejector pin marks are formed.

Even when the center core 5 is in a free state in the case 3 when the disk cartridge is not used, such as when storing or transporting the disk cartridge, even if the magnetic disk 4 moves to the lower shell 2 side or the upper shell 1 side. Since the magnetic disk 4 is in contact with the surface of the protective projection 14a, the magnetic disk 4 does not come into contact with an acute angle portion (ejector pin trace 13 or the like) formed on the inner surface of the shell, thereby preventing damage to the magnetic disk 4 due to the acute angle portion. The protection projection 14a has a curved surface facing the magnetic disk.
It is hard to be scratched.

The above-mentioned protective projection is shown in FIG. 1 as long as it does not disturb the flow of air on the surface of the magnetic disk when the magnetic disk rotates, and has no acute angle portion such that the surface facing the magnetic disk is curved. It is not limited to the hemispherical shape of the protection projection 14a. 2 and 3 are views showing other embodiments of the protective projection, in which (a) is a plan view, ((b) is a view as viewed from the arrow B in (a), and (c) is a view in C of (a). The protection projections are, for example, a semi-spindle-shaped protection projection 14b as shown in FIG.2, and a plate-shaped protection projection with a semicircular side shape as shown in FIG.3. When such a protection projection 14b or 14c is formed on the inner surface of the shell, the protection projection 14b or 14c may be used.
Is desirably arranged so that the longitudinal direction of the magnetic disk is the circumferential direction of the magnetic disk.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to this, and a disk cartridge having no acute angle portion on the inner surface of the shell is provided.
A protection projection as described above may be formed. In this case,
It is possible to prevent the magnetic disk from directly contacting the facing surface of the upper shell or the lower shell. In the above embodiment, the present invention is applied to a magnetic disk cartridge without a liner. However, the present invention is applied to a magnetic disk cartridge with a liner, a recordable / reproducible optical disk, a magneto-optical disk, and the like. The present invention can also be applied to a disk cartridge in which the disk-shaped recording medium described above is stored in a case.

[0020]

According to the disk cartridge of the present invention, the inner surface of the shell is provided by providing a plurality of disk-shaped recording medium protecting projections having a curved disk-shaped recording medium opposing surface on each of the opposing surfaces of the upper shell and the lower shell. Can prevent the disk-shaped recording medium from being damaged by the acute angle portion. Therefore, it is possible to provide a high-density disk cartridge with improved data recording / reproducing reliability.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a disk cartridge according to the present invention, wherein (a) is a schematic cross-sectional view, (b) is a plan view of an inner surface side of a lower shell, and (c) is a magnetic disk protection. FIG.

FIGS. 2A and 2B are diagrams showing another example of the magnetic disk protection projection, in which FIG. 2A is a plan view, FIG.
(C) is a view on arrow C of (a).

3A and 3B are diagrams showing still another example of a magnetic disk protection projection, in which FIG. 3A is a plan view, FIG. 3B is a view as viewed from arrow B in FIG. 3A, and FIG. View.

FIG. 4 is a schematic sectional view showing a state where a conventional disk cartridge is mounted on a disk drive.

FIG. 5 is an enlarged sectional view showing ejector pin marks.

FIG. 6 is a schematic sectional view showing a conventional no-liner disk cartridge.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper shell, 2 ... Lower shell, 3 ... Case, 4 ... Magnetic disk, 5 ... Center core, 13 ... Ejector pin mark, 13a ... Burr, 14a, 14b, 14c ... Magnetic disk protection protrusion

Claims (3)

[Claims] 1. A disk cartridge comprising: a case composed of an upper shell and a lower shell; and a disk-shaped recording medium rotatably housed in the case, wherein opposing surfaces of the upper shell and the lower shell are provided. A disk cartridge having a plurality of disk-shaped recording medium protecting projections having a curved surface facing the disk-shaped recording medium. 2. The projection for protecting a disk-shaped recording medium,
The disk cartridge according to claim 1, wherein the hemispherical projection, the semi-fusiform projection, and the side projection are one of a semicircular plate-shaped projection. 3. The height of the disk-shaped recording medium protecting projection is greater than the height of an acute angle portion on each of the opposing surfaces of the upper shell and the lower shell. 2. The disc cartridge according to 2.