JPH09102176A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the spindle chucking of a disk cartridge to a disk smooth. SOLUTION: In a disk cartridge having a two-division shell body for housing a disk by holding the disk between front and back surfaces, a plurality of recesses 9 or projections 10 are regularly provided in a rib on a shell body 2a for receiving the hub of the disk or in an inner wall surface 6. Since the hub is smoothly slid against the rib or the inner wall surface 6, a spindle is quickly inserted into the center hole of the hub.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge for accommodating an optical disc or the like.

[0002]

2. Description of the Related Art Conventionally, there is a disc cartridge that accommodates a disc such as an optical disc, which has a halved shell 2 for accommodating a disc 1 as shown in FIG. The shell 2 is an upper shell 2a and a lower shell 2
b, and an insertion hole 24 into which a spindle 23 for chucking the hub 4 of the disc 1 is inserted is formed in the center of the lower shell 2b, and the disc 1 is formed in the center of the upper shell 2a.
The rib 25 that can come into contact with the annular wall surface 1a that surrounds the hub 4 is formed in an annular shape.

However, when rotating the disk 1,
When the spindle 23 enters the shell body 2 through the insertion hole 24 of the lower shell 2b, the spindle 23 moves to the center hole 4a of the hub 4.
When entering, the disc 1 is pushed toward the upper shell 2a, and the annular wall surface 1a surrounding the hub 4 of the disc 1 abuts against the rib 25 and slides, or the back surface of the hub 4 is surrounded by the inner wall surface 26 surrounded by the rib 25. Abut and slide. This slip causes spindle 2
3 enters smoothly into the center hole 4a of the hub 4. When chucking by the spindle 23 is completed,
The disk 1 also rotates with the rotation of the spindle 23, and the recording on the disk 1 is read by a read head (not shown).

[0004]

In the conventional disc cartridge, when the spindle 23 enters the center hole 4a of the hub 4 as described above, the disc 1 is pushed toward the upper shell 2a side and the hub 4 of the disc 1 is pushed. Ring wall 1 that surrounds
a is in contact with the rib 25, or the back surface of the hub 4 is the rib 2
The inner wall surface 26 surrounded by 5 is in contact with the inner wall surface 26 of the disk 1 due to friction between the annular wall surface 1a of the disk 1 and the rib 25 or friction between the back surface of the hub 4 and the inner wall surface 26 of the rib 25. There is a risk that a chucking failure will occur without occurring.

Therefore, it is an object of the present invention to provide means capable of solving such a problem.

[0006]

In order to achieve the above-mentioned object, the invention of claim 1 is a hub of the disk 1 in a disk cartridge having a halved shell 2 for holding the disk 1 by sandwiching it from both front and back surfaces. 4. A structure in which a plurality of concave portions 9 or convex portions 8, 10, 18 are regularly provided on an inner wall surface 6 surrounded by ribs 7 of the shell body 2 facing the shell 4 is adopted. The present invention provides a disc cartridge having a halved shell body 2 for housing a disc 1 sandwiched from both front and back sides, and a plurality of ribs 7 of the shell body 2 facing an annular wall surface 1a surrounding a hub 4 of the disc 1 are provided with a plurality of ribs. The concave portions 9 or the convex portions 8, 10 and 18 are regularly provided.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 As shown in FIGS. 1 to 4, this disc cartridge has a flat and substantially square shell 2 that accommodates a disc 1 such as a 3.5-inch optical disc.

The shell body 2 is divided into an upper shell 2a and a lower shell 2b so that the disk 1 can be housed by sandwiching the disk 1 from both front and back sides. The upper shell 2a and the lower shell 2b are provided with openings 3a, 3b for allowing a head (not shown) of a disk recording / reproducing device to face the recording surface of the disk 1. Further, the lower shell 2b has a spindle 23 (see FIG. 13), which is a drive shaft of the disc recording / reproducing apparatus, attached to the hub 4 of the disc 1.
An opening 5 for exposing the above (see) is provided so as to be continuous with the above-mentioned opening 3b for the head. A rib 7 is formed in an annular shape at the center of the upper shell 2a, and the rib 7 faces the annular wall surface 1a surrounding the hub 4 of the disk 1. Also,
An inner wall surface 6 of the upper shell 2a surrounded by the rib 7 faces the back surface of the hub 4 of the disk 1.

As described above, when the spindle 23 enters the center hole 4a of the hub 4, the disc 1 is moved to the upper shell 2a.
When pressed to the side, the annular wall surface 1a that surrounds the hub 4 of the disk 1 abuts the rib 7, or the back surface of the hub 4 abuts the inner wall surface 6 that is surrounded by the rib 7. Friction between the la and the rib 7 or the back surface of the hub 4 and the rib 7
Due to the friction between the inner wall surface 6 and the inner wall surface 6, the disk 1 does not move with respect to the shell body 2, and there is a risk of defective chucking. In order to prevent this, a plurality of concave portions or convex portions are regularly provided on the inner wall surface 6 surrounded by the ribs 7 of the shell body 2 facing the hub 4 of the disc 1.
Further, a plurality of concave portions or convex portions are regularly provided on the rib 7 of the shell body 2 facing the annular wall surface 1a surrounding the hub 4 of the disk 1. In this embodiment, the concave portion or the convex portion is provided on both the rib 7 and the inner wall surface 6, but it may be provided on only one of them.

The above-mentioned recesses or protrusions are specifically constructed as shown in FIGS. That is,
A large number of arcuate protrusions 8 are formed at a constant pitch on the edge of the rib 7 facing the disc 1. Since the disk 1 contacts these protrusions 8 around the hub 4, the disk 1 easily slides with respect to the shell body 2 during chucking by the spindle 23, and the spindle 23 is securely in the center hole 4a of the hub 4. It will come in.
The inner wall surface 6 is regularly provided with a plurality of grooves 9 and protrusions 10 alternately. The groove 9 and the ridge 10 are the upper shell 2
It extends radially from the center of a toward the inner circumference of the rib 7 at a constant angular pitch. The groove 9 is formed so as to enter the thickness of the upper shell 2a. Since the grooves 9 and the protrusions 10 are regularly provided on the inner wall surface 6 in this manner, the hub 4
The area of contact with the hub 4 is reduced, and the hub 4 slides on the inner wall surface 6 during the chucking, so that the spindle 23 quickly enters the center hole 4a of the hub 4.

In addition, the disk cartridge includes
A shutter 1 for opening and closing the openings 3a, 3b, 5
1 is attached to the shell body 2 via a slider 12. Since the shutter 11 is biased in one direction by the spring 13 housed in the shell body 2, the shutter 11 is opened through the slider 12 so that the opening 3
A, 3b, 5 are always closed. The slider 12 is a rod member having a substantially quadrangular prism shape, and slides along the guide rails 16a, 16b, 17a, 17b provided on the upper shell 2a and the lower shell 2b as shown in FIGS. 3 and 4. Has become.

When the shutter 11 is opened by the opening / closing pin 14 driven by the driving device in the disc recording / reproducing apparatus, the hub 4 of the disc 1 is exposed outside the shell 2 and the spindle 23 in the disc recording / reproducing apparatus is opened. Attempts to enter the center hole 4a at the center of the hub 4. At that time, the hub 4 slides slightly on the inner wall surface 6 in the shell body 2, and the annular wall surface of the disk around the hub 4 also slides against the rib 7, so that the spindle 23 smoothly enters the center hole 4a. After that, the disk 1 is smoothly rotated in the shell body 2 by the rotational drive of the spindle 23.

Embodiment 2 Ribs 7 and inner wall surfaces 6 of this disk cartridge
Has a configuration as shown in FIGS.

That is, the rib 7 is constituted by a large number of elongated dome-shaped projections 18 connected in an annular shape at a constant pitch. Therefore, the disk 1 does not come into close contact with the inner surface of the shell 2 at a portion around the hub 4 and friction is reduced, so that the disk 1 moves smoothly.

On the inner wall surface 6, a plurality of ridges 9 and grooves 10 are regularly provided. Specifically, the ridges 9 and the grooves 10 radially extend from the center of the upper shell 2a toward the inner circumference of the rib 7 at a constant angular pitch. The groove 10 is formed so as to enter the thickness of the upper shell 2a. Since the concave portions and the convex portions are regularly provided on the inner wall surface 6 by the ridges 9 and the grooves 10 as described above, friction is reduced when the hub 4 comes into contact with the hub 4, and the hub 4 moves on the inner wall surface 6. It becomes slippery.

Embodiment 3 FIG. 12 shows the inner wall surface 6 of the disk cartridge.
The concave portions and the convex portions are regularly provided in the patterns shown in (A), (B), (C), and (D).

1A is constructed by arranging a large number of convex portions of the quadrangular pyramid-shaped projections 10 at a constant pitch, and FIG. 1B is a projection formed in a hexagonal shape. A concave portion and a convex portion are formed by 10, and in the same figure (C), the concave portion and the convex portion are formed by arranging a large number of hemispherical protrusions 10 at a constant pitch. In addition, FIG. 1D shows a large number of curved projections 1 extending from one point and having different curvatures.
0 forms a concave portion and a convex portion. In this case, one point is preferably set on the gate 19 of the injection molding die, and the projection 10 is preferably formed along the flow of the molten resin injected from the gate 19. The flow of molten resin is indicated by arrow a.

[0018]

According to the present invention, since a plurality of concave portions or convex portions are regularly provided on the rib of the shell or the inner wall surface surrounded by the rib, the annular wall surface around the hub of the disk or When the hub of the disk comes into contact with the rib or the inner wall surface, the frictional force is reduced and the disk or the hub becomes slippery with respect to the shell. For this reason, even if the hub of the disc is slightly displaced from the center of the shell and stopped, the hub can move smoothly on the inner wall surface. Chucking will be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disc cartridge according to the present invention as viewed from above.

FIG. 2 is a perspective view of the disc cartridge as viewed from the back side.

FIG. 3 is a perspective view of the upper shell of the shell as viewed from the inside.

FIG. 4 is a perspective view of the lower shell of the shell as viewed from the inside.

FIG. 5 is a plan view showing the vicinity of the hub receiving surface of the upper shell.

FIG. 6 is a partially cutaway enlarged view of the receiving surface of the hub.

FIG. 7 is a sectional view taken along line VII-VII in FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a partially cutaway enlarged view of a receiving surface according to another embodiment of the present invention.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a sectional view taken along line XI-XI in FIG. 9;

FIG. 12 is a schematic view showing various patterns of a receiving surface according to another embodiment of the present invention.

FIG. 13 is a vertical cross-sectional view showing the relationship between a conventional disc cartridge and a spindle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc 1a ... Annular wall surface 2 ... Shell body 4 ... Hub 6 ... Inner wall surface 7 ... Rib 9 ... Recessed portion 8, 10, 18 ... Convex portion

Claims (2)

[Claims] 1. A disc cartridge having a halved shell for holding a disc sandwiched from both front and back sides, wherein a plurality of recesses are provided on an inner wall surface surrounded by ribs of the shell facing the hub of the disc. Alternatively, the disk cartridge is characterized in that projections are regularly provided. 2. A disc cartridge having a halved shell for holding a disc sandwiched from both front and back sides, wherein a plurality of recesses or protrusions are provided on a rib of the shell which faces an annular wall surface surrounding a hub of the disc. A disk cartridge characterized by being regularly provided.