JPH0896546A - Disk cartridge - Google Patents

Abstract

PURPOSE: To prevent the generation of abnormal noises and the damage of a disk according to chucking defect and the operation defect of a drive by roughening the rib surface of a cartridge for disk or the surface of the internal surface of the disk corresponding thereto. CONSTITUTION: This disk cartridge 6 consists of an upper half 7 and a lower half 8. The inside surface part enclosing the insertion port 9 of the lower half 8 is provided with ribs 11, 12 for receiving the disks in an annular form in correspondence to the non-signal recording region 4 on the peripheral surface of the disk 1. The surfaces of the ribs 11, 12 or at least a part of the inside surface part of the disk corresponding thereto are roughened. As a result, the centering of the disk is sufficiently satisfactorily executed without generating tight adhesion when the inside surface part of the disk comes into contact with the rib surface at the time of inserting a spindle of the driving device into the hub surface of the cartridge 6 for disks and, therefore, the generation of the abnormal noises and the breakage according to the chucking defect are prevented.

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 for rotatably housing an optical disk such as a magnetic disk, a magneto-optical disk, or an optical disk.

[0002]

2. Description of the Related Art Conventionally, in a disc cartridge case used for rotatably storing a disc-shaped disc such as a magneto-optical disc and an optical disc, the stored disc and the cartridge body are in contact with each other and the signal recording surface of the disc is scratched. In order to prevent the 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. KAISHO 61-982, JP-A-62-186
No. 276 is proposed. When information is recorded / reproduced on / from the optical disc, the spindle 32 of the drive device is inserted into the spindle insertion hole 30 of the hub 29 of the disc cartridge as shown in FIGS. The magnetic body 31 provided on the main body is fixed by the magnet clamp 33, and the spindle 32 and the clamp 3 are fixed.
Writing (recording) and reading (reproduction) are performed by irradiating a laser beam from below while rotating 3.

In the above-mentioned apparatus, the disk cartridge is placed horizontally, that is, in the horizontal direction, and the spindle of the drive device is inserted from the lower side to the upper side of the cartridge to record / reproduce information. There is also known a system in which a disk cartridge is placed vertically, that is, placed vertically, and a spindle of a drive device is inserted from the lateral direction of the cartridge to record / reproduce information.

[0004]

It has been found that the above-mentioned system in which the spindle of the drive device is inserted from the lateral direction with the disc cartridge installed vertically has the problems described in detail below. That is, as shown in FIG. 3, when the disc cartridge is placed vertically, the center of the disc spindle insertion hole 30 is displaced downward from the center of the cartridge (by the clearance of the disc storage portion) as shown in A. In this state, when the spindle 32 of the drive device is laterally inserted and centered, the inclined portion 34 at the tip of the spindle 32 first presses in the lateral direction 35, but a part thereof is orthogonal, The disk 1 is also pressed in the vertical direction 36, and the disk 1 slides in the pressing direction, and the disk (the hub thereof) moves to the center and is centered. As shown in FIGS. 3B and 3C, when the cartridge is placed vertically, the disk 1 is pressed laterally by the inclined portion 34 of the spindle 32, and the disk 1 makes a strong contact with the rib 11, and the contact surface As a result, the two are in close contact with each other, and it becomes difficult for the disc 1 to slide in the vertical direction, so that the centering of the disc 1 is not performed sufficiently.

Therefore, chucking, that is, the clamp portion 33 of the drive and the surface of the magnetic body 31 of the hub 29 are not properly adhered to each other, resulting in chucking failure. In that state, the spindle of the drive device is rotated to cause abnormal noise. It has been found that there are problems such as the occurrence of damage to the disk 1 and the damage of the disk 1, and further, the eccentric rotation of the disk 1 causes malfunction of the drive.

[0006]

The inventors of the present invention have made extensive studies to solve the above-mentioned problems of the conventional disk cartridge, and as a result, the disk cartridge is placed vertically and the spindle of the drive device is laterally arranged. When the disc is inserted into the hub, the disc is strongly pressed in the lateral direction, the disc surface and the rib face come into close contact with each other, and the pressing force is concentrated on the contact surface, resulting in insufficient centering of the disc. In view of the king failure, by roughening at least one of the contact surfaces of the disk surface and the rib surface, the disk can be centered without being brought into close contact with each other, and the above problems are solved. They have found that they can do so and have completed the present invention.

That is, the gist of the present invention is a disc cartridge for rotatably storing a disc, which comprises an upper half and a lower half, in which the discs on the side wall surfaces of the upper half and the lower half are stored. A disk characterized in that at least a part of the surface of the disk receiving rib provided in an annular shape at a position corresponding to the non-recording area of the peripheral part or the surface of the inner peripheral part of the disk corresponding thereto is roughened. Exists in the cartridge for.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a disk cartridge (a cartridge that contains a disk), and FIG. 2 is an enlarged vertical cross-sectional view showing the relationship between a drive device and the cartridge. In the figure, reference numeral 1 denotes a disk having a recording area 2, an outer peripheral non-recording area 3 and an inner peripheral non-recording area 4, and a hub 5 for magnet clamping (chucking) is provided in the center. ing. As the disc 1, for example, a disc substrate made of a polycarbonate resin and provided with an information signal recording layer is preferably used.

Reference numeral 6 denotes a disk cartridge for rotatably housing the disk 1 therein. For example, a synthetic resin having good moldability and sufficient mechanical strength, such as polycarbonate resin or ABS resin, is injection molded. Consists of
The disc cartridge 6 includes an upper half 7 and a lower half 8.
In the state where the discs 1 are housed, they are formed by being abutted against each other and screwed together. In the inner surface portion surrounding the insertion ports 9 of the upper half 7 and the lower half 8 of the cartridge 6, disc receiving ribs 11 and 12 are usually formed in a circle corresponding to the non-signal recording area 4 on the inner peripheral side of the disc 1. It is provided in a ring. The ribs 11 and 12 may have a partially cut-out annular shape.

The disk receiving ribs 11 and 12 are provided in the non-recording area 4 on the inner peripheral side of the disk 1 to be housed, preferably from the outer side of the contact position of the clamp mechanism of the non-recording area 4 on the inner peripheral side. 4 Provided in the area of the outermost circumference. Rib 1
The widths of 1 and 12 are at least 0.5 mm, preferably 1 to 13 mm, and more preferably 1 to 1 at the positions of the inner wall surfaces (disk storage side wall surfaces) of the upper half 7 and the lower half 8.
It is preferable that the width is 0 mm and the shape is annular. The height (H) of the ribs 11 and 12 varies depending on the thickness of the disc, the thickness of the upper and lower halves, etc., but may be any height as long as it can hold the disc 1 without contacting the inner wall surface of the cartridge. The height is about 1 to 1 mm.

Further, as the magnet clamp hub described above, a metal hub or an outer peripheral portion of the annular magnetic body 13 is integrally insert-molded with resin as shown in FIG. 1 so as to facilitate attachment to a disc. For example, a hub provided with a hat portion 10 on the outer peripheral portion is used. In the present invention,
When the disk 1 is pushed by the spindle, at least one of the surface of the receiving rib 11 on the side abutting or the surface of the inner surface of the disk corresponding (contacting) with the rib 11 is subjected to a roughening treatment to form a hub and a disk. It is to prevent the both from adhering to each other at the contact portion with the inner surface.

Examples of the surface-roughening treatment include embossing treatment using electric discharge treatment, blasting treatment (sandblasting treatment), honing treatment for polishing with particles, and electric discharge machining treatment. These surface roughening treatments may be performed on the surface of the molding die, or may be directly performed on the surface of the molded product (the surface of the rib of the cartridge or the surface of the disk in contact with the rib). The degree of the roughening treatment is R of the treated surface.
The range of _max is preferably 5 to 50 μm, and more preferably 10 to 30 μm.

[0013] The R _max of the surface of the surface of the disc receiving rib 11 of the cartridge disk shown in Embodiment 1 Figure 1 with embossed process 2
When the cartridge having a rough surface of 0 μm is placed vertically and the spindle 20 of the drive device is inserted into the hub 5 from the lateral direction, the centering of the disk can be sufficiently performed, and the abnormal noise during chucking is generated. No outbreak was observed.

Comparative Example 1 As a result of carrying out in the same manner as in Example 1 except that the rib 11 whose surface was not textured was used,
The inner surface of the disk and the rib surface were in contact with each other, the centering of the disk could not be performed satisfactorily, and abnormal noise was generated during chucking.

[0015]

As described above, according to the present invention, at least a part of the rib surface of the disk cartridge or the surface of the inner surface of the disk corresponding to the rib surface is roughened.
When the spindle of the drive is inserted into the hub surface of the disc cartridge, when the inner surface of the disc comes into contact with the rib surface, the centering of the disc can be performed satisfactorily without sticking phenomenon, resulting in chucking failure. It is possible to prevent the generation of abnormal noise and damage to the disc, and also prevent the malfunction of the drive.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view showing the relationship between a drive device and a cartridge.

FIG. 3 is an explanatory view showing a usage state of a conventional cartridge.

[Explanation of symbols]

 1 disk 5 hub 6 cartridge 11 rib

Claims (1)

[Claims] 1. A disk cartridge comprising an upper half and a lower half for rotatably storing a disk, wherein the inner half of the disk to be housed on the side wall surfaces of the upper and lower halves of the disk. A disc cartridge characterized in that at least a part of a surface of a disc receiving rib annularly provided at a position corresponding to a recording area or a surface of an inner peripheral portion of the disc corresponding thereto is roughened.