JPS61214288A - Disk cartridge - Google Patents

Abstract

PURPOSE:To maintain a long life of a disk and lower an error rate in reading and writing of information by holding the disk in a space of a cartridge case in a floating condition by a magnetizing operation. CONSTITUTION:A magnet constituting an external periphery spacer 14 of an optical disk 2 and a magnet 15 disposed in a cartridge case 1 are disposed so as to confront the same pole to each other. Accordingly, the magnet constituting the outer peripheral spacer 14 of the optical disk 2 and the magnet 15 repel with each other and are maintained in a floating condition in a space of the case 1 with a full clearance left from the case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc cartridge that stores and holds a disc in a cartridge case.

[Conventional technology]

In a conventional optical disk cartridge, for example, an optical disk 2 is housed and held in a cartridge case 1, as shown in FIG. The optical disc 2 consists of two substrates 4 made of transparent glass or plastic each having an information recording layer 3 on the inside, and a space formed between them by a center jig 7 having an outer peripheral spacer 5 on the outside and a spindle fitting hole 6 on the inside. It is maintained and configured with .

In order to prevent the optical disc 2 from wobbling in the cartridge case 1, a disc holder 8 is formed integrally with the cartridge case 1, a leaf spring 9 is attached to the cartridge case 1, and a leaf spring 9 is attached to the leaf spring 9. The optical disc 2 is held within the cartridge case 1 by a disc holder 10.

When the optical disk cartridge is installed in the disk drive device, the leaf spring 9 and the disk holder 10 are retracted, and the spindle of the drive device is fitted and fixed into the spindle fitting hole 6 provided in the center jig 7 of the optical disk 2. Ru.

Since there is a slight gap between the optical disc 2 and the disc holder 8, the optical disc 2 can be rotated without contacting the cartridge case 1.

[Problem that the invention seeks to solve]

Since the gap between the optical disc 2 and the disc holder 8 is narrow,
If the optical disk 2 or the cartridge case 1 is warped, they will come into contact with each other. If the optical disk is rotated in this state, the constituent members of the two may rub against each other, generating dust, or further deforming the two. This causes uneven rotation of the optical disc, which adversely affects information reading and writing. In order to avoid this, if the gap between the optical disc 2 and the disc holding member 8 is widened, the optical disc 2 will wobble within the cartridge case 1.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides magnets for each of the cartridge case and the disk, and arranges these magnets so that the same poles face each other. It is characterized in that the disk is held in a floating state in the space within the cartridge case by the repulsive force of the same polarity.

[Effect]

As described above, in the present invention, by utilizing the repulsive force between magnets of the same polarity, the disc is held in a floating state within the cartridge case with a sufficient gap. contact can be prevented.

〔Example〕

An embodiment in which the present invention is applied to an optical disc will be described below.

FIG. 1(A) is a cross-sectional side view of a disk cartridge according to the first embodiment of the present invention, FIG. 1(B) is a plan view of FIG. 1(A), and FIG. It is a partially enlarged view of (A).

In the figure, 11 is provided in the cartridge case 1,
A read/write window for introducing a laser beam for reading/writing information; 12, a spindle introduction hole provided in the cartridge case 1; 13, a shutter that opens and closes the read/write window 11 and the spindle introduction hole 12; 14; 15 is a circumferential spacer made of a magnet, and 15 is a magnet having a circumferential shape and a U-shaped cross section and is attached to the cartridge case 1 using an adhesive, for example, facing the outer spacer 14.

The magnets constituting the outer spacer 14 of the optical disk 2 and the magnet 15 provided in the cartridge case 1 are shown in FIG.
), the same poles are arranged so as to face each other. Therefore, the magnets constituting the outer spacer 14 of the optical disk 2 and the magnets 15 provided in the cartridge case 1 repel each other, and the optical disk 2 is held in a floating state in the space inside the cartridge case 1 with a sufficient gap from the cartridge case 1. be done.

FIG. 2(A) is a partially sectional side view of a disk cartridge according to a second embodiment of the present invention, and FIG. 2(B) is a side view of FIG. 2(A).
FIG.

This embodiment is composed of a center jig 16 and a magnet. Donut disc-shaped magnets 17 and 18 are attached to the cartridge case 1 using an adhesive so as to face the upper and lower surfaces of the center jig 16, respectively. The magnets constituting the center jig 16 of the optical disk 2 and the magnets 17 and 18 provided in the cartridge case 1 are arranged so that the same polarities face each other, as illustrated in FIG. 1(c). . Therefore, the center jig 16 of the optical disc 2
and the magnet 17.1 provided in the cartridge case 1.
8, the optical disc 2 is held in a floating state in the space within the cartridge case 1 with a sufficient gap between the optical disc 2 and the cartridge case 2.

Outer circumferential spacer 14 of the first embodiment described above. Magnet 15 and center jig 16 of the second embodiment. The constituent materials of the magnets 17 and 18 are KS steel, MK steel, and OP magnets.

New KS steel or alnico was used.

Although the present invention has been described in detail above, the present invention is not limited to the above-mentioned embodiments, such as the shape of the magnet, the arrangement of N poles and S poles, and its application to discs other than optical discs. It goes without saying that variations are possible.

Furthermore, an electromagnet can be used as the magnet provided in the cartridge case 1. That is, when the disk is driven, a current is passed through an electromagnet provided in the cartridge case 1 to generate a magnetic field, and the repulsive force with the magnet provided in the optical disk 2 holds the optical disk 2 in a floating state with a sufficient gap in the cartridge case 1. Rotate and drive.

〔Effect of the invention〕

As explained above, the present invention can hold and rotate a disk in a floating state with a sufficient gap in the space inside the cartridge case by using the repulsive force of the magnet.
Abrasion of the optical disc and cartridge case due to contact rotation between the two, generation of dust from the constituent members of both,
Deformation of both or uneven rotation of the disk can be prevented, and it is possible to extend the life of the disk and reduce the error rate in reading or writing information.

[Brief explanation of drawings]

FIG. 1(A) is a cross-sectional side view of a disk cartridge according to the first embodiment of the present invention, FIG. 1(B) is a plan view of FIG. 1(A), and FIG. Partial enlarged view of (A), 2nd
Figure (A) is a partial cross-sectional side view of a disk cartridge according to a second embodiment of the present invention, Figure 2 (B) is a partial plan view of Figure 2 (A), and Figure 3 is an example of a conventional disk cartridge. FIG. 1... Cartridge case 2... Optical disc 3... Information recording layer 4...
- Substrate 5... Outer circumference spacer 6... Spindle fitting hole 7... Center jig 8... Disk holding part 9... Leaf spring 10... Disc holder
11...Read/write window 12...Spindle introduction hole 13...Shutter 14...Outer spacer made of magnet 15.17.18...Magnet

Claims (3)

[Claims] (1) In a disk cartridge formed by storing a disk in a cartridge case, magnets are provided in the cartridge case and the disk, and these magnets are arranged so that the same poles face each other,
A disk cartridge characterized in that the disk is held in a floating state in a space within the cartridge case by a repulsive force between like poles. (2) The disk cartridge according to claim 1, wherein the magnet provided on the disk constitutes an outer peripheral spacer of the disk. (3) The disk cartridge according to claim 1, wherein the magnet provided on the disk constitutes a center spacer of the disk.