JP2555012Y2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a disk cartridge for accommodating a recording medium such as an optical disk or a magnetic disk.

[Conventional technology]

Generally, a recording medium such as an optical disk or a magnetic disk is housed in a plastic disk cartridge. This disk cartridge has an upper half and a lower half, and is stacked so as to sandwich the disk therebetween, and is fixed by a tapping screw.

A hub exposing hole for exposing a hub of the disc is provided at a center portion of the disc cartridge, and an annular projection abutting on a non-recording surface of the disc is formed along an edge of the hub exposing hole.

[Problems to be solved by the invention]

However, since the annular projection of the conventional disk cartridge is formed along the edge of the hub exposure hole, it comes into contact with a portion closer to the center axis of the disk. Therefore, the disk becomes unstable in the disk cartridge during rotation as well as at rest.

Therefore, an object of the present invention is to provide a disk cartridge in which such a conventional disadvantage is eliminated.

[Means for solving the problem]

The present invention is provided with an upper half 2 and a lower half 3 which are combined so as to sandwich the disk 10, and the upper and lower halves 2, 3
In a disc cartridge provided with a hub exposure hole 12 for exposing the hub 11 of the disc 10 in the center of the disc 10, the exposure hole 12 is surrounded at a position away from the edge of the hub exposure hole 12, and the non-recording Annular projections 15, 16 projecting toward the surface and abutting against the non-recording surface of the disk when reading the recorded contents of the disk, the upper and lower halves 2,
3, at least the tops of the annular projections 15 and 16 adopt a configuration of a disk cartridge formed on a convex curved surface.

[Action]

The annular projection surrounds the hub exposing hole at a location away from the edge of the exposing hole and projects toward the non-recording surface of the disc.

As a result, the disk is uniformly supported by the continuous annular projection at a position farther from the central axis, and is stably held during the stationary state and the rotating state.

〔Example〕

Hereinafter, an embodiment of the disc cartridge 1 according to the present invention will be described with reference to FIGS.

As shown in FIGS. 2 to 4, the disk cartridge 1 has an upper half 2 and a lower half 3 associated therewith.

These upper and lower halves 2, 3 are provided with substantially square plate portions 4, 5,
Peripheries 6 and 7 are provided around the plate portions 4 and 5 so as to match each other. Further, inside the peripheral walls 6, 7, there are provided circular enclosure walls 8, 9, which form a storage space for a disk when the two halves 2, 3 overlap each other.

Also, in the center of the upper and lower halves 2, 3, FIG.
As shown in the figure, a hub exposure hole 12 for exposing the hub 11 of the disk 10 housed in the disk cartridge 1 is formed, and a head insertion hole 13 is provided adjacent to the hub exposure hole 12.
Is provided.

Further, as shown in FIGS. 1 and 5, a portion of the hub exposing hole 12 remote from the edge 14 surrounds the hub exposing hole 12 and protrudes toward the non-recording surface of the disk 10. Continuous annular projections 15, 16 are provided on the upper and lower halves 2, 3, respectively, and at least the top of each annular projection 15, 16 is formed in a convex curved surface.

As a result, the disk 10 is uniformly supported by the annular projections 15 and 16 at a position farther from the center axis, and is stably held. In this case, the annular projections 15 and 16 come into contact with the non-recording surface of the disk 10, so that the quality of the disk 10 is not deteriorated.

The hub exposure hole 12 and the head insertion hole 13 can be opened and closed by a shutter 17. The shutter 17 is urged by a spring 18, and the lower part thereof is
Is guided by a guide plate 19 adhered to the.

Reference numerals 20, 20 provided near the guide plate 19
Is a double write protection device.

In addition, reference numerals provided at appropriate positions inside the upper half piece 2
The projections indicated by 21 are small-diameter insertion projections. A screw hole 22 for receiving a fixing tapping screw (not shown) is formed at the center of the insertion protrusions 21. On the other hand, receiving projections 23 are provided on the lower half 3 at positions corresponding to the insertion projections 21.
.. Have a receiving hole 24 for receiving the tip of the insertion protrusion 21.
Are formed.

Such a disk cartridge 1 is usually inserted into a read / write device (not shown) from a front side having a spring 18 or the like, and a shutter 17 is opened. And
A spindle (not shown) is inserted into the hub 11 exposed from the hub exposure hole 12, the disk 10 is rotated, and a read head (not shown) is inserted from the read hole 13 to read the recorded contents of the disk 10. It will be. At this time, the disk 10 is stably rotated because it is supported by the annular projections 15 and 16 farther from the central axis.

[Effect of the invention]

According to the present invention, as described above, the continuous annular projection faces the non-recording surface at a position farther from the center axis of the disk hub, and at least the top of the annular projection is formed in a convex curved surface. Therefore, the recorded contents of the disk are not impaired, the resistance applied to the disk is reduced, and the rotation is smooth.

[Brief description of the drawings]

1 to 5 show an embodiment of the disk cartridge according to the present invention, FIG. 1 is a sectional view taken along the line II of FIG.
FIG. 2 is a perspective view of the entire disc cartridge, FIG. 3 is a perspective view of the upper half, FIG. 4 is a perspective view of the lower half, and FIG. It is. 1 ... disk cartridge, 2 ... upper half, 3 ... lower half, 10 ... disk, 11 ... hub, 12 ... hub exposed hole, 14 ... edge of hub exposed hole, 15, 16 ... annular Protrusions.

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk cartridge comprising an upper half and a lower half combined to sandwich a disk, and a hub exposure hole for exposing a hub of the disk at a center of the upper and lower halves. The annular projection surrounds the exposed hole at a position distant from the edge of the hub exposed hole, and projects toward the non-recording surface of the disk, and the annular protrusion that contacts the non-recording surface of the disk when reading recorded contents of the disk is the annular protrusion. A disk cartridge formed on both upper and lower halves, wherein at least the top of the annular projection is formed on a convex curved surface.