JP2001006313A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the formation of an edge part (level difference part) in the inner wall surface of a disk housing part caused by positional shifting during the joining of upper and lower shells. SOLUTION: This cartridge 1 is constructed in such a manner that a disk housing part 5 is formed in a cartridge main body part 4 having upper and lower shells 2 and 3 being butted to be joined, and a disk 101 is rotatably housed in the disk housing part 5. The disk housing part 5 is provided with arcuate ribs 11 to 14 protruded in the inner surface of any one of the upper and lower shells 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped recording medium such as a magneto-optical disk on a cartridge body constituted by joining an upper shell and a lower shell formed in half from a synthetic resin material or the like to each other and joining them together. The present invention relates to a disk cartridge in which a medium is rotatably stored.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional disk cartridge such as an optical disk cartridge accommodates a disk in a cartridge body 4 in which an upper shell 2 and a lower shell 3 formed of a synthetic resin or the like are joined together by abutting each other. Part 5
Is formed, and a disk-shaped information recording medium (hereinafter, disk) 101 is rotatably stored in the disk storage section 5. The disk accommodating portion 5 is formed in a concentric circle substantially the same as the outer diameter of the disk 101 by arcuate ribs 11 to 14 protruding from the upper and lower shells 2 and 3.

Since the disk 101 in the cartridge body 4 is in a free state except for being normally mounted on a device, for example, when the cartridge is carried, the outer peripheral end of the disk 101 has the inner wall surface of the disk storage, that is, the arc-shaped rib 1.
It may come into contact with the inner peripheral surface of 1 to 14.

[0004]

[0007] As shown in FIG.
In a disk cartridge in which the abutting of the arc-shaped ribs 11 to 14 of the upper and lower shells 2 and 3 is completely matched, as described above, even when the disk end face contacts the inner wall surface of the disk storage section, It is formed in a substantially concentric circle with the outer diameter of the disk, and is partially received on the entire outer periphery, and the clearance with the disk in the storage portion may be small.

However, the actual disk cartridge is
Due to the dimensional errors of the upper and lower shells 2 and 3 and the positioning accuracy when the upper and lower shells 2 and 3 are combined, the butting surfaces of the arc-shaped ribs 11 to 14 of the upper and lower shells 2 and 3 are determined. As shown in FIG. 8, an edge portion (step portion) E is generated on the inner wall surface of the disk storage portion, and the outer edge of the disk 101 is damaged by the edge portion E, as shown in FIG. There was a problem that it was easy to receive.

According to the present invention, it is possible to reliably prevent the occurrence of a step on the inner wall surface of the disk storage portion due to a dimensional error in manufacturing the upper and lower shells and a positional error in connecting the upper and lower shells. Thus, the above-mentioned conventional problems can be solved.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a disk storage portion is formed in a cartridge body in which an upper shell and a lower shell are joined to each other, and a disk-shaped recording medium is rotatably stored in the disk storage portion. In the disk cartridge, the disk storage portion is formed by an arc-shaped rib protruding from the inner surface of one of the upper shell and the lower shell, so that the position shift and the like when the upper and lower shells are combined are formed. As a result, it is possible to prevent an edge portion from being generated on the inner peripheral wall of the disk storage portion.

[0008]

1 to 3 show a disk cartridge 1 according to a first embodiment of the present invention. 1 is a partially cutaway perspective view of the disk cartridge 1, FIG. 2 is an exploded perspective view, and FIG. 3 is a sectional view of a main part. In the disk cartridge 1, a disk storage portion 5 is formed in a cartridge body 4 in which an upper shell 2 and a lower shell 3 are joined to each other, and a disk 101 is rotatably stored in the disk storage portion 5. Shutter 6 on body 4
Are slidably mounted. 7 is a shutter lock, and 8 is a light protector.

The upper shell 2 is formed in a substantially square shape by a thermoplastic synthetic resin such as ABS or polycarbonate.

The upper shell 2 has a circular hub fitting portion 2a for inserting the upper end of the chucking hub 102 at the center of the disk 101 at the center of the inner surface, and recording / reproducing on one side thereof. Opening 2b, and positioning boss fitting portions 2c... 2c and welded portions 2d.

The lower shell 3 is formed in a substantially square shape by a thermoplastic resin such as ABS or polycarbonate similarly to the upper shell 2.

The lower shell 3 has a spindle (drive) opening 3a at the center of the inner surface thereof at a position facing the hub fitting portion 2a of the upper shell 2. The recording / reproducing of the upper shell 2 is performed. Recording / reproducing openings 3b at positions opposed to the opening portions 2b for positioning, and positioning bosses 3c, 3 at positions facing the positioning boss fitting portions 2c... 2c of the upper shell 2 at the four corners.
c and boss portions 3d... 3d for welding.

The lower shell 3 has first to fourth arcuate ribs 11 to 14 constituting the disk storage section 5 on the inner peripheral edge.

The first to fourth arc-shaped ribs 11 to 14
Is formed at a height H2 that is approximately twice the height H1 of the outer peripheral wall 3d of the lower shell 3.

The disk 101 is formed by attaching a metal hub 103 made of stainless steel or the like to the center of a disk body 102 made of a synthetic resin provided with a light or magneto-optical recording layer.

The disk 101 is provided with the first to fourth arc-shaped ribs 11 to 14 in a state where the central portion of the hub 103 faces the opening 3 a for the spindle of the lower shell 3.
Is housed in a disk housing 5 made of The shutter lock 7 is rotatably mounted on a shutter lock mounting shaft 3e provided on the lower shell 3, and the light protector 8 is slidable into a light protector accommodating portion 3f provided on the lower shell 3. It is attached.

The disk 101 is stored in the disk storage portion 5 of the lower shell 3, the shutter lock 7 is mounted on the shutter lock mounting shaft 3e, and the light protector 8 is slidably mounted in the light protector storage portion 3f. After that, the upper and lower shells 2 and 3
, And positioning bosses 3c... 3c are fitted to the positioning boss fitting portions 2c... 2c to position them, and boss portions 3d.
Is pressed to apply ultrasonic vibration or the like, the welded portion 2
2d and welding ribs (not shown) at the tips of the welding bosses 3d... 3d are melted and welded, and the upper and lower shells 2 and 3 are joined to form the cartridge body 4. Then, a shutter 6 is attached to the cartridge body 4.
Is assembled to constitute the disk cartridge 1 of the present invention.

The disk cartridge 1 according to the first embodiment has the above-described structure, and includes upper and lower shells 2 and 3.
3, the upper ends of the first to fourth arc-shaped ribs 11 to 14 provided on the lower shell 3 contact the inner surface of the upper shell 2 as shown in FIG. Ribs 11-
Since the disk storage part 5 is constituted by 14, even when the upper and lower shells 2 and 3 are displaced when the upper and lower shells 2 and 3 are connected to each other, this causes the inner wall surface of the disk storage part 5 to be There is no edge portion unlike a conventional disk cartridge. However, as in the case of the conventional disk cartridge, an edge portion is generated on the inner wall surface of the disk storage portion due to a positional shift or the like when the upper and lower shells 2 and 3 are combined, and the edge portion of the disk 101 is formed by the edge portion. The outer edge is never damaged. Even when dust or the like enters through the gap δ between the peripheral walls 2 g and 3 g of the upper and lower shells 2 and 3, the dust and the like enter the cartridge housing 5 by the first to fourth arc-shaped ribs 11 to 14. Intrusion can be prevented. In the embodiment, the case where the arc-shaped ribs 11 to 14 are provided on the lower shell 3 side is shown, but the arc-shaped ribs 11 to 11 are provided on the upper shell 2 side.
14 may be provided.

FIGS. 4 and 5 show a second embodiment. In this embodiment, the lower shell 3 is provided with arcuate ribs 11 to 14, and the upper shell 2 is provided with arcuate ribs 11 to 14.
When the upper and lower shells 2 and 3 are connected, the distal ends of the arc-shaped ribs 11 to 14 are connected to the rib fitting portions 21 to 24, respectively. The arc-shaped ribs 11 to 14 and the rib fitting portions 21 to 24 have a positioning function.

The arc-shaped ribs 11 to 14 and the rib fitting portion 2
Since 1 to 24 are formed in an arc shape, accurate positioning becomes possible, and it becomes possible to omit a conventional positioning boss or a positioning boss fitting portion. Further, by using the positioning boss and the positioning boss fitting portion together, more accurate positioning can be performed. In the embodiment, the lower shell 3 is provided with the arc-shaped ribs 11 to 14, and the upper shell 2 is provided with the rib fitting portions 21 to 24. However, the upper half 2 is provided with the arc-shaped ribs 11 to 14. The lower half 3 may be provided with rib fitting portions 21 to 24. The other configuration, operation, and effect are the same as those in the first embodiment, and therefore, the same components are denoted by the same reference numerals, and redundant description will be omitted.

[0021]

The disk cartridge of the present invention has the following effects. (1) In the disk cartridge of the first aspect, the disk housing portion is formed by the arc-shaped rib provided on one of the upper and lower shells. Thus, the occurrence of an edge portion in the disk storage portion can be prevented, and the outer peripheral end of the disk stored in the disk storage portion can be protected. (2) In the disk cartridge of the second aspect, since the arc-shaped ribs have the function of the positioning boss, the existing arc-shaped positioning boss can be eliminated. In particular,
Since the arc-shaped rib is longer and larger than the existing cylindrical positioning boss, it is possible to accurately position it. In addition, since the tip of the arc-shaped rib is in contact with the inner surface of the other shell, it is possible to prevent dust and the like from entering the disk storage portion.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a first embodiment.

FIG. 2 is an exploded perspective view of the first embodiment.

FIG. 3 is a sectional view of a main part.

FIG. 4 is an exploded perspective view of the second embodiment.

FIG. 5 is a sectional view of a main part.

FIG. 6 is an exploded perspective view of a conventional example.

FIG. 7 is a sectional view of a main part.

FIG. 8 is a sectional view showing a problem.

[Description of Signs] 1 ... Disc cartridge, 2 ... Upper shell, 3 ... Lower shell, 4 ... Cartridge main unit, 5 ... Disk storage unit, 1
1 to 14: arc-shaped ribs, 21 to 24: rib fitting portions.

Claims (2)

[Claims] 1. A disk cartridge comprising: a disk housing portion formed in a cartridge body in which an upper shell and a lower shell are joined to each other by abutting each other, and a disk-shaped recording medium rotatably stored in the disk storage portion; The storage cartridge is formed by an arc-shaped rib protruding from an inner surface of one of the upper shell and the lower shell. 2. The disk cartridge according to claim 1, wherein the arc-shaped rib provided on one of the upper half and the lower half is fitted into a rib fitting portion provided on the other half.