JPS6020374A - Disk cartridge - Google Patents

Abstract

PURPOSE:To control contacting pressure securely by using a composite liner formed by joining a plastics sheet and nonwoven fabric together as a liner to be interposed between the internal surface of a disk case and a disk. CONSTITUTION:This cartridge consists of the disk case made of hard plastics material, the disk 2 stored in the case rotatably, and the liner A3 which is provided over the internal surfaces of the disk case to contact disk surfaces. Liners 3 are interposed between the internal surface of an upper case 1a and the disk 2, and the internal surface of a lower cace 1b and the disk 2. Each liner is a horseshoe in plane view and has composite structure of the plastics sheet 7 and nonwoven fabric 8 stuck to its surface; and the plastics sheet 7 is stuck to the internal surface of the case and the nonwoven fabric 8 contacts both surface of the disk 3 in a clamping state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk cartridge in which a disk is rotatably housed in a disk case, and the liner that slides on the disk is improved.

In this type of disk cartridge, a nonwoven fabric liner is generally attached to the inner surface of the disk case, and the disk surface is cleaned with this nonwoven fabric liner. However, with a liner made only of nonwoven fabric, cleaning performance can be improved by increasing the thickness of the liner and increasing the contact pressure against the disk surface, but the disk rotation torque becomes too high. On the other hand, if the thickness of the nonwoven fabric liner is made small to lower the contact pressure with the disk, there is a contradictory problem in that the desired cleaning performance cannot be obtained and dropout occurs.

Therefore, in the past, for example, the nonwoven fabric liner itself was processed to have an uneven cross section by processing the nonwoven fabric liner itself to give it elasticity.
Depending on the inner surface shape of the case, one or several locations in the circumferential direction of the nonwoven fabric liner are raised toward the disk, and this raised portion is locally strongly pressed into contact with the disk surface. However, these methods still do not provide satisfactory effects. This is thought to be due to the extremely weak springiness (elasticity) of the nonwoven fabric liner itself in the thickness direction.

From this point of view, the present invention can rotate the disk with low torque and improve cleaning performance. The aim is to obtain such a disk cartridge, and its feature is that the liner has a composite structure consisting of a plastic sheet that can be elastically deformed in the thickness direction and a non-woven fabric overlaid on this, and the non-woven fabric is on the surface of the disk. The point is that it comes into contact with the

Hereinafter, the details will be explained based on the drawings. FIGS. 1 to 4 show the first part of the disk cartridge according to the present invention.
An embodiment is shown, which includes a disk case 1 made of a hard plastic material, a disk 2 that is rotatably installed inside the disk case 1, and a disk 2 that is lined on the inner surface of the disk case 1 and contacts the disk surface. It consists of liner 3.

The disc case 1 is a plastic upper and lower case 1a.
1b are joined in a lid-to-bottom manner, and has a vertically penetrating drive shaft insertion window 4 approximately in the center, and has a head insertion window 5 and an index hole 6 before and after the drive shaft insertion window 4.

The liner 3 is between the inner surface of the upper case 1a and the disk 2.

and interposed between the inner surface of the lower case 1b and the disk 2, respectively. Each liner 3 has a horseshoe shape in plan view, and has a composite structure consisting of a plastic sheet 7 and a nonwoven fabric 8 bonded to the surface of the plastic sheet 7. The plastic sheet 7 is bonded to the inner surface of the case, and the nonwoven fabric 8 is bonded to the disc 3. contact with both sides of the

The plastic sheet 7 is made of vinyl chloride, polyester,
It is made of polypropylene, polyethylene, nylon, polycarbonate, polybutylene terephthalate, etc., and is given elastic deformation force in the thickness direction. For example, as shown in Figure 9, an elastic deformation force is applied in the thickness direction by embossing the cross-section into an uneven shape. Alternatively, as shown in FIG. 5, the sheet 7 may be formed into a wave shape, a lattice shape, or made of foamed resin to impart elastic deformability in the thickness direction. .

The nonwoven fabric 8 is made of plastic fibers such as rayon, polypropylene, etc., and is overlapped so as to follow the planar shape of the plastic sheet 7, and is bonded entirely or partially by adhesive or heat welding. Of course.

The nonwoven fabric 8 is not limited to one that does not overlap along the uneven shape of the plastic sheet 7, but the nonwoven fabric 8 is flattened and overlapped on the convex portion of the plastic sheet 7, as shown in FIG. Good too.

If the gap G between the inner surfaces of the upper and lower cases 1a and 1b and the disk 2 is the usual 500μ, 1. For example, the thickness a of the plastic sheet 7 is 100μ, and the thickness b of the nonwoven fabric 8 is 250μ.
The height due to the convex portion (before being interposed between the inner surfaces of the upper and lower cases 1a and 1b and the disk 2) is approximately 200μ.

When the elasticity of the nonwoven fabric 8 itself is relatively high, the thickness of the plastic sheet 7 is increased to adjust the contact pressure against the surface of the disk 2 to an appropriate value.

In such a case, even if the nonwoven fabric 8 has weak elasticity due to its own thickness, the elasticity of the plastic sheet 7 allows it to always contact the surface of the disk 2 with an appropriate pressure.

The rotational torque of the disk 2 is suppressed to a low level to reliably clean dust adhering to the disk surface.

In addition, in the first embodiment described above, on the liner adhesion surfaces of the inner surfaces of the upper and lower cases 1a and 1b, the rear center portion facing the head insertion window 5 and the portions located on the left and right sides of the head insertion window 5 as necessary are provided. The raised portions 9 are provided vertically facing each other,
The surface of the disk is locally cleaned at opposing locations of the raised portions 9. However, as shown in FIGS. It is also possible to omit providing the raised portion 9 on the case side by molding it into the provided shape.

When the raised portion 9 is provided, the height of the raised portion 9 is 100 μ when the gap G is 500 μ, and the thickness a of the plastic sheet 7 is 100 μ.

The thickness b of the nonwoven fabric 8 is 250 μm, and the height due to the air gap of the plastic sheet 7 (before the plus deck sheet 7 is interposed between the inner surfaces of the upper and lower cases 1a and 1b and the disk 2) is 100 μm.

The nonwoven fabric 8 may be brought into contact with the disk surface with uniform pressure over the entire surface. Although FIG. 8 does not show the uneven shape on the surface, the plastic sheet 7 itself does not have the uneven cross-sectional shape as shown in FIG. 7 because it has raised parts 9a, and the elastic force due to the raised parts 9a At least the nonwoven fabric 8 pasted on the raised portion 9a may be brought into contact with the disk surface (in that case, the result will be exactly as shown in FIG. 8). The raised portion 9a may be provided only at one location, for example, at the rear center portion.

Other 1 The present invention can be applied not only to magnetic disks but also to optical disks and the like.

As explained above, according to the present invention, the liner 3 interposed between the inner surface of the disk case 1 and the disk 2 is made of plastic 7. Since the nonwoven fabric 8 is brought into pressure contact with the disk 2 by the elasticity of the plastic sheet 7, the elastic force of the plastic sheet 7 is used to press the nonwoven fabric 8 against the disk 2 without relying on the thickness of the nonwoven fabric 8. This means that the contact pressure can be controlled effectively and reliably.

Therefore, there is an advantage that the desired cleaning performance can be ensured while suppressing the rotational torque of the disk 2 to a low level.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a disk cartridge according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
The figure is a partially cutaway plan view, and FIG. 4 is a partially enlarged sectional view. FIG. 5 is a partially perspective view showing another embodiment of the liner according to the present invention. FIG. 6 is a sectional view showing still another embodiment of the liner according to the present invention. 7 and 8 show still another embodiment of the liner according to the present invention, and FIG. 7 is a sectional view. FIG. 8 is a schematic perspective view thereof. ■・・・Disc case. 2...Disk. 3...Composite liner. 7...Plastic sheet. 8...Nonwoven fabric. Figure 5 °/ Figure 6 424- Figure 8

Claims (1)

[Claims] (1) Between the inner surface of the disc case 1 and the disc 2 5
A disc cartridge characterized in that a liner 3 interposed therein is a composite liner made by joining a plastic sheet 7 that is elastically deformable in the thickness direction and a nonwoven fabric 8 that contacts the disc 2.