JPH1040663A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge of improved quality by eliminating the problem that occurs when ultrasonically welding upper and lower halves forming a cartridge case. A pair of upper and lower halves facing each other are provided.
The disk-shaped recording medium 5 is rotatably housed in a cartridge case 4 formed by ultrasonic welding.
Ribs 10 and 11 which form partition walls which surround the disk-shaped recording medium 5 and prevent dust entering the cartridge case 4 from adhering to the disk-shaped recording medium 5.
Are provided on the inner edge of at least one of the partition wall forming ribs 10 and 11.
8 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge used as an information recording medium for computer equipment and the like.

[0002]

2. Description of the Related Art FIGS. 8 and 9 are perspective views showing an example of a disk cartridge used as an information recording medium of a computer device or the like. As shown in the figure, the disk cartridge is composed of a pair of upper and lower halves 102, 1 facing each other.
The disk-shaped recording medium 10 such as an optical disk or a magnetic disk
5 are rotatably stored in each half 102, 1
A partition forming rib (not shown) that forms a partition surrounding the disk-shaped recording medium 105 and preventing dust that has entered the cartridge case 104 from adhering to the disk-shaped recording medium 105 is provided on the inner surface of the disk 03. .

[0003]

Conventionally, the upper and lower halves of a disk cartridge are screwed as shown in FIG.
However, it has been studied to fix the upper and lower halves 102 and 103 by ultrasonic welding for cost reduction. However, in the conventional disk cartridge, since the inner edges of the ribs are sharp, the inner edges of the ribs rub against each other when the upper and lower halves 102 and 103 are ultrasonically welded. There is a problem that burrs are generated and adhere to the disk-shaped recording medium 105 to cause an error at the time of recording / reproducing, or the disk-shaped recording medium 105 is damaged by contact with the disk-shaped recording medium 105.

In a conventional disk cartridge,
When the upper and lower halves 102 and 103 are ultrasonically welded, vibration is transmitted to the peripheral portions of the halves 102 and 103, and ribs provided along both side edges and the rear edge of the inner surface of each of the halves 102 and 103 rub against each other. When the disk cartridge 101 is loaded on the drive device, there is a problem that the burrs protrude from between the upper and lower halves 102 and 103, thereby causing a problem such that the burrs may be caught or damaged. Was.

An object of the present invention is to provide a disk cartridge of improved quality by solving the above-mentioned problems.

[0006]

According to a first aspect of the present invention, there is provided a disk cartridge in which a pair of upper and lower halves opposed to each other are ultrasonically welded in a cartridge case. Is rotatably housed, and on the inner surface of each half, a partition wall forming rib that forms a partition wall that surrounds the disk-shaped recording medium and prevents dust that has entered the cartridge case from adhering to the disk-shaped recording medium. In the provided disk cartridge, a radius is formed at an inner edge of at least one of the partition wall forming ribs.

According to a second aspect of the present invention, in the disk cartridge according to the first aspect, both sides and a rear end surface of the cartridge case are provided along a boundary between the upper and lower halves. A groove for accommodating burrs protruding from between the upper and lower halves by sonic welding is provided.

According to a third aspect of the present invention, in the disk cartridge according to the second aspect, the groove is provided along both side surfaces of one of the halves and an inner edge of a rear edge. It is characterized by being formed by a step portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view of a disk cartridge according to an embodiment of the present invention as viewed from the front side, FIG. 2 is a view of the disk cartridge of FIG. 1 as viewed from the back side, and FIG. FIG. 4 is a view of the lower half viewed from the back side, and FIG. 4 is a view of the lower half viewed from the back side.

Disk cartridge 1 shown in FIGS.
Is used as an information recording medium of a computer device or the like, and a disk-shaped recording medium 5 is rotatably housed in a cartridge case 4 formed by a pair of upper and lower halves 2 and 3 facing each other. Reference numeral 6 denotes a head access window through which the recording / reproducing head of the drive unit exchanges information with the disk-shaped recording medium 5, 7 denotes a motor access window through which a drive shaft of the drive unit is inserted, and 8 denotes a front edge of the cartridge case 4. The shutter 9 is slidably mounted along the line to open and close the head access window 6 and the motor access window 7, and 9 is a spring for maintaining the shutter 8 at the closed position.

As shown in FIGS. 3 and 4, partitions on the inner surfaces of the halves 2 and 3 surround the disk-shaped recording medium 5 and prevent dust entering the cartridge case 4 from adhering to the disk-shaped recording medium 5. Of a substantially circular partition wall forming ribs 1
0 and 11 are provided. The partition wall forming ribs 10 provided on the upper half 2 also serve as part of the ribs 12 provided along both side edges and the rear end edge of the inner surface of the upper half 2, and form the partition wall forming ribs provided on the lower half 3. Rib 11 is lower half 3
Ribs 13 provided along both side edges and the rear edge of the inner surface of the
Also serves as a part of.

At the four corners of the inner surface of the upper half 2, cylindrical welding bosses 14 projecting toward the inner surface side are provided. On the inner surface of the lower half 3, four welding bosses 14 fitted to these welding bosses 14 are provided. A fitting portion 15 is provided. The fitting portion 15 is shown in FIG.
As shown in (1), it has a cylindrical peripheral wall 16 and an annular welding rib 17 provided at the bottom inside the peripheral wall 16 and having a sharp tip. The inner diameter D of the peripheral wall 16 is slightly smaller than the outer diameter of the welding boss 14, and is fitted to the welding boss 14. The diameter d of the tip of the welding rib 17 is larger than the inner diameter of the welding boss 14. When the halves 2 and 3 are overlapped, the distal end surface of the welding boss 14 comes into contact with the distal end of the welding rib 17, and when the welding boss 14 is vibrated by an ultrasonic welding machine, these rub against each other and are welded to each other. It has become. In addition, in the disk cartridge of this embodiment, in addition to the above four portions, portions D and E at which the ribs 10 of the half 2 intersect with the ribs 12 (see FIG. 3).
Are ultrasonically welded to the portions of the half 3 that face the above D and E, and are ultrasonically welded at a total of six locations.

As shown in FIG. 6, ribs 10 and 1 for forming partition walls are provided.
On the inner edge of 1, a round 18 of 0.2 mm is formed over the entire circumference. Thereby, when the halves 2 and 3 are ultrasonically welded, it is possible to prevent the inside edges of the partition wall forming ribs 10 and 11 from rubbing against each other to generate shavings and burrs. The radius may be formed only on the inner edge of one of the ribs 10 and 11. In addition, the radius is not necessarily formed on the innermost edge of the rib for forming the partition wall,
It may be formed on the inner edge of the portion where 1 contacts.

The ribs 10 and 11 are narrow in width, and it is difficult to engrave grooves for forming the ribs 10 and 11 in the mold. The position is divided into an inner block and an outer block. In the conventional disk cartridge, the mold can be divided even at the position of the inner edge of the rib for forming the partition wall. In this case, the burr formed by the gap between the two blocks forms the partition wall during ultrasonic welding. There is a problem that the ink falls on the inside of the rib and adheres to the disk-shaped recording medium, and an error occurs during recording and reproduction.

In this disk cartridge 1, since the radius 18 is formed on the inner edge of the ribs 10 and 11, the mold is divided at the inner edge of the ribs 10 and 11 to form the outer rib. Since the block becomes blade-shaped at the radius 18 and becomes difficult to mold, the mold needs to be divided at the outer edges of the ribs 10 and 11 as a result. The burrs generated between the ribs do not fall inside the partition ribs 10 and 11. Therefore, it is possible to reliably prevent the above-described problem from occurring.

In this embodiment, as shown in FIG. 7, both sides and the rear end face of the cartridge case 4 have a width of 0.5 mm along a boundary between the upper and lower halves 2 and 3.
A groove 20 having a depth of 0.3 mm is provided.
Are formed by step portions 19 provided along both sides of the inner surface of the half 3 and the inner edge of the rear end surface. As described above, when the halves 2 and 3 are ultrasonically welded, the vibration is transmitted to the rims of the halves 2 and 3, and the ribs 12 and 13 rub against each other and are welded to each other, so that the burrs protruding from between the halves 2 and 3. However, in this disk cartridge 1, the generated burrs are accommodated in the grooves 20 and do not protrude from the cartridge case 4. Therefore, when the disk cartridge 1 is loaded into the drive device, the burrs do not catch. Also, the appearance is good because there are no burrs. The groove 20 may be formed by providing a step on the upper half 2 side, or may be formed by providing a step on both halves 2 and 3.

[0017]

As described above, in the disk cartridge of the present invention, the upper and lower halves are superposed by forming a radius on at least one of the inner edges of the ribs formed on the inner surfaces of the upper and lower halves. Since the inner edges of the ribs forming the partition walls do not rub against each other during sonic welding, no shavings or burrs are generated, so that it is possible to prevent errors from occurring during recording and reproduction.

According to a second aspect of the present invention, in the disk cartridge, burrs projecting from the upper and lower halves by ultrasonic welding on both side surfaces and a rear end surface of the cartridge case along a boundary between the upper and lower halves. Is provided, a burr does not catch when loading the disk cartridge into the drive device.
The appearance is good because burrs are not visible.

[Brief description of the drawings]

FIG. 1 is a view of a disk cartridge according to an embodiment of the present invention as viewed from the front side.

FIG. 2 is a view of the disk cartridge of FIG. 1 as viewed from the back side.

FIG. 3 is a view of the upper half viewed from the back side.

FIG. 4 is a view of the lower half viewed from the back side.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIGS.

FIG. 7 is a sectional view taken along line CC of FIG. 1;

FIG. 8 is a perspective view of a conventional disk cartridge viewed from the front side.

FIG. 9 is a perspective view of the disk cartridge of FIG. 8 as viewed from the back side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk cartridge 2 Upper half 3 Lower half 4 Cartridge case 5 Disk-shaped recording medium 10, 11 Partition rib Rib 18

Claims (3)

[Claims] 1. A disk-shaped recording medium is rotatably housed in a cartridge case in which a pair of upper and lower halves facing each other are ultrasonically welded, and an inner surface of each of the halves surrounds the disk-shaped recording medium and is provided with a cartridge. In a disk cartridge provided with ribs for forming a partition for preventing dust entering the case from adhering to the disk-shaped recording medium, a radius is formed on an inner edge of at least one of the ribs for the partition. A disk cartridge characterized by the above-mentioned. 2. A groove for accommodating a burr projecting from between the upper and lower halves by ultrasonic welding along a boundary between the upper and lower halves on both side surfaces and a rear end surface of the cartridge case. The disk cartridge according to claim 1, wherein: 3. The disk cartridge according to claim 2, wherein the groove is formed by a step provided along inner edges of both side surfaces and a rear end surface of one of the halves.