JP2746135B2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge for rotatably storing an optical disk such as a magnetic disk or a magneto-optical disk or an optical disk.

[0002]

2. Description of the Related Art Conventionally, a disk cartridge case used for rotatably storing a disk-shaped disk such as a magneto-optical disk, an optical disk, or the like, has a problem in that the stored disk and the cartridge body come into contact with each other and the signal recording surface of the disk is damaged. In order to prevent sticking, a supporting portion (referred to as a rib) having a protruding shape is provided on the side of the cartridge facing the disk, and the rib supports the non-recording surface on the inner peripheral side of the disk. JP-A-61-982, JP-A-62-186
276, etc. When information is recorded / reproduced on / from the optical disk, the spindle 32 of the drive device is passed through the spindle insertion hole 30 of the hub 29 of the disk cartridge as shown in FIGS. The provided magnetic body 31 is fixed by a magnet clamp 33, and the spindle 32 and the clamp 33 are fixed.
While writing, laser light is irradiated from below to perform writing (recording) and reading (reproduction). In the above-described apparatus, the disk cartridge is placed horizontally, that is, in a horizontal direction, and the spindle of the drive device is inserted upward from below the cartridge to record and reproduce information. There is also known a method in which a disk cartridge is placed vertically, that is, in a vertical direction, and a spindle of a drive device is inserted from a lateral direction of the cartridge to record / reproduce information.

[0003]

It has been found that the above-mentioned system in which the disk cartridge is placed vertically and the spindle of the drive device is inserted from the lateral direction has the following problems. That is, as shown in FIGS. 5A to 5D, when the disk cartridge is set vertically, as shown in FIG. 5A, the center of the spindle insertion hole of the disk is higher than the center of the cartridge (the disk storage portion). When the spindle of the drive device is inserted from the lateral direction and centered in that state, the spindle is pressed in the lateral direction 35 by the inclined portion 34 at the tip of the spindle, but a part of the spindle is pressed. The disc is also slid in the direction perpendicular to the direction, that is, the vertical direction 36, the disc slides in the pushing direction, and the disc (hub) moves to the center and is centered. As shown in FIGS. When the cartridge is set vertically, the disc is pressed laterally by the inclined part of the spindle, and the disc comes into strong contact with the ribs. Less likely to slide disk vertically in close contact, a centering disc is not carried out sufficiently satisfactory. Therefore, the chucking, that is, the clamping of the drive and the close contact between the magnetic surface of the hub and the magnetic material surface of the hub are not performed properly, resulting in a chucking failure. It has also been found that there is a problem that the drive rotation is eccentric due to the eccentric rotation of the disk.

[0004]

The present inventors have conducted intensive studies to solve the above-mentioned problems of the conventional disk cartridge. As a result, the disk cartridge is placed vertically and the spindle of the drive device is moved from the lateral direction. When the disc is inserted into the hub, the disc is strongly pressed in the lateral direction, the disc surface and the rib surface come into contact and come into close contact, and the pressing force concentrates on the contact surface, resulting in insufficient centering of the disc. In consideration of the defect, the center area of the disk can be sufficiently satisfied by contacting the upper half with the hat portion of the hub to expand the contact area and disperse the pressing force. We have found that we can do this and completed the present invention. That is,
The gist of the present invention is to provide a disk cartridge comprising an upper half and a lower half in which a disk having a magnet hub having a hat portion attached to the center of a disk substrate is rotatably housed, A disc cartridge characterized by having a structure in which a tip end surface of a hat portion of the hub contacts an inner surface of the half when the hub is inserted into the hub. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are longitudinal sectional views of a disk cartridge (cartridge in which a disk is stored).
FIG. 2 is an enlarged longitudinal sectional view showing a hub. In the figure, reference numeral 1 denotes a disc having a recording area 2, a non-recording area 3 on the outer periphery and a non-recording area 4 on the inner periphery, and a hub 5 for magnet clamping (chucking) is provided at the center. ing.
As the disc 1, for example, a disc substrate provided with a recording layer for information signals on a disc substrate made of a polycarbonate resin is preferably used. Reference numeral 6 denotes a disk surface cartridge which rotatably stores the disk 1 therein, and is formed by, for example, injection-molding a synthetic resin having good moldability and sufficient mechanical strength, such as a polycarbonate resin or an ABS resin. The disk cartridge 6 is composed of an upper half 7 and a lower half 8, and is formed by abutting each other and screwing together in a state where the disk 1 is stored. Disc receiving ribs 11 and 12 corresponding to the non-signal recording area 4 on the inner peripheral side of the disc 1 are usually provided on the inner surface surrounding the insertion opening 9 of the upper half 7 and the lower half 8 of the cartridge 6,
It is provided in a ring shape. The magnet clamp hub 5 used in the present invention is formed by integrally insert-molding the outer peripheral portion of the annular magnetic body 13 with a resin,
In order to facilitate attachment to a disk, a hub provided with a hat portion 10 on the outer periphery of the hub is used.
Numeral 0 is attached to the inner peripheral surface 4 of the disk by bonding or ultrasonic welding.

According to the present invention, as shown in FIG. 2, when the above disk cartridge is placed vertically, that is, placed vertically (FIG. 2 (a)), when the spindle 20 of the drive device is inserted into the hub 5 from the side, The hub 5 has a structure in which the tip end surface of the hat portion 10 contacts the inner surface 13 of the upper half 7 (FIG. 2B). Therefore, when the disk receiving rib 11 is provided on the inner surface portion 13 of the upper half 7 as shown in FIG.
1 has a structure in which the front end surface of the hat portion 10 of the hub contacts the inner surface 13 of the upper half 7. That is, as shown in FIG. 3, the distance A between the tip surface a of the hat portion of the hub and the recording surface b of the disk is larger than the distance B between the inner surface C of the upper half 7 and the tip portion d of the disk receiving rib 11. It is necessary to be. That is, the value of (distance A)-(distance B) is greater than 0, preferably 0.01 mm or more, more preferably 0.05 mm or more, and most preferably 0.1 mm or more.
A range of 10 mm or more is preferable. In the present invention, as described above, when the spindle of the drive device is inserted into the hub surface of the disk cartridge, the hat portion 10 of the hub has a structure in which the tip portion contacts the inner surface of the upper half 7.
The disk receiving rib 11 may not be provided. That is, since the tip of the hat portion 10 of the hub comes into contact with the inner surface of the upper half 7, it is possible to prevent the stored disk 1 from contacting the cartridge body and damaging the signal recording surface of the disk. can do.

Examples 1 to 3 and Comparative Examples 1 and 2 The structure of the disk cartridge shown in FIG. 3, that is, the distance A between the tip end surface a of the hat portion of the hub and the recording surface b of the disk and the inner surface C of the upper half 7 Using a disk cartridge in which the difference between the distance B and the tip d of the disk receiving rib 11 is as shown in Table 1, the cartridge was placed vertically, and the spindle 20 of the drive device was inserted into the hub 5 from the lateral direction. Table 1 shows the results of examining the presence or absence of abnormal sounds during chucking.

[0008]

[0009]

As described above, the cartridge of the present invention does not cause poor chucking or abnormal sound even when used in the vertical direction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cartridge of the present invention.

FIG. 2 is a longitudinal sectional view of the cartridge of the present invention.

FIG. 3 is an enlarged sectional view of a hub.

FIG. 4 is a longitudinal sectional view of a conventional cartridge.

FIG. 5 is a longitudinal sectional view of a conventional cartridge.

[Explanation of symbols]

 1 disk 5 hub 6 cartridge 10 hat section 20 spindle

Claims (2)

(57) [Claims] 1. A disk cartridge comprising an upper half and a lower half in which a disk having a magnet clamping hub having a hat portion attached to a center portion of a disk substrate is rotatably housed. A disk cartridge having a structure in which a tip surface of a hat portion of the hub contacts an inner surface of an upper half when a spindle is inserted into the hub. 2. When inserting a spindle of a drive device into a hub of a disk cartridge, the disk does not come into contact with a disk receiving rib (supporting portion) provided on an inner surface of an upper half. 2. The disk cartridge according to claim 1, wherein a tip end surface of the hat portion has a structure in contact with an inner surface of the upper herb.