JPS5930272A - Disk cartridge - Google Patents

Abstract

PURPOSE:To improve the cleaning performance even if disk rotation torque is low, by sticking a nonwoven cloth linear obtained as one body so as not to be separated, by confounding a bundle of a thick synthetic resin long fiber to an intermediate layer of a thin synthetic resin fiber being in an elaborate state, to the inside face of a disk case. CONSTITUTION:A nonwoven cloth liner 1 consists of an extremely thin acrylic short fiber 2 of 0.05-0.3 denier and 1-5mm. length which is confounded to each other and forms the surface and the reverse side, and that which forms a bundle of 10-50 pieces of a polyester long fiber 3 of 0.5-5 densiers, and in the middle of an acrylic short fiber 2 group, a bundle 4 of the polyester long fiber 3 runs longitudinally and laterally in the planer direction and forms a confounded section structure as one body so as not to be separated. According to such a consitution, abundant elasticity is provided to the nonwoven cloth liner 1, contact pressure against the surface of a disk is small, and the cleaning performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk cartridge characterized by the material of the nonwoven fabric liner that is attached to the inner surface of the disk case and comes into contact with the disk surface.

Conventionally, this type of liner has generally been made of a nonwoven fabric made of entangled rayon and polypropylene (for example, N0VONETTE9302 manufactured by Kendall Corporation in the United States, J
B-3, etc.), but in such conventional nonwoven fabric liners, fibers may fall off due to sliding contact with the disk, causing serious problems such as dropouts. If the contact pressure with the disk is low, dust cannot be completely cleaned from the disk surface. Even if the contact pressure with the disk, that is, the disk rotation torque, was increased to the maximum allowable level, the cleaning performance was relatively poor, and from this point as well, problems such as dropouts were observed.

This invention was proposed in order to eliminate such conventional problems, and in various types of disk cartridges, the contact pressure of the nonwoven fabric liner against the disk surface,
In other words, the main objective is to significantly improve the cleaning performance of the disk surface even if the disk rotation l/lux is low.

Its feature is the entangled structure of the fibers of the nonwoven fabric that makes up the liner.1 The nonwoven fabric liner of the present invention has a number of thin synthetic resin fibers such as acrylic that form the front and back surfaces, and thick synthetic resin long fibers such as polyester. A bundle of thick synthetic resin long fibers is intertwined with an intermediate layer of thin synthetic resin fibers in a dense state, and the fibers are inseparably intertwined. It is characterized by having a thickness of 0.3 mm or more.

A nonwoven fabric with such a basic entangled structure is known as a nonwoven fabric called GLOIRE (registered trademark) by Mitsubishi Rayon Co., Ltd., and the present invention is characterized by its application to the liner of a disk cartridge.

Next, the specific structure of the nonwoven fabric liner used in the present invention will be explained based on the drawings. Fig. 1 is a schematic longitudinal cross-sectional view, Fig. 2 is a photograph of the surface of the actual product taken with an electron microscope, and Fig. 3 is the longitudinal direction thereof. It is a photograph showing the cut end surface of. In FIG. 1, a non-woven fabric liner 1 has ultrafine acrylic short fibers 2 of 0.05 to 0.3 denier and 1 to 5 denier length, which are intertwined with each other to form one front surface and a back surface, and 0.5 to 5 denier fibers. A bundle of 10 to 50 polyester long fibers 3 is formed in the form of a bundle, and a bundle 4 of polyester long fibers 3 runs horizontally and vertically in the plane direction between the two groups of acrylic short fibers. It has an integrally intertwined cross-sectional structure. According to this nonwoven fabric liner 1, since a sheet layer in which polyester long fibers 3 are gathered is interposed in the middle in the thickness direction, the shrinkage force of the polyester long fibers 3 prevents the acrylic short fibers 2 from falling off during heat processing and finishing. Therefore, there is no problem even if the thickness of the nonwoven fabric liner 1 is set to 0.3 mm or more, and this gives the nonwoven fabric liner 1 rich elasticity.
The contact pressure against the disk surface is small, which is the reason for the dramatic improvement in cleaning performance.

On the surface of the nonwoven fabric liner 1, ultra-fine acrylic short fibers 2 are densely grown like love hair.
can pick up fine dust on the disc surface. The polyester fibers 3 prevent the acrylic short fibers 2 from falling off from the cut surface or surface of the nonwoven fabric.

Provides mechanical strength to the nonwoven liner 1. therefore,
The fiber composition ratio of the nonwoven fabric liner 1 needs to be at least 20% or more for both the short acrylic fibers 2 and the long polyester fibers 3, and it is preferable that they be in approximately the same ratio.

When the nonwoven fabric liner 1 is uniformly impregnated with an elastic binder such as urethane resin, it is more effective in preventing the fibers from falling off, and the abrasion resistance of the surface 5 is also improved.

However, if the amount of the urethane resin mixed is too large, the fluffing of the acrylic short fibers 2 on the surface of the nonwoven fabric will be reduced and the cleaning performance will not be adversely affected, so it is preferably in the range of 2 to 20% by weight.

Furthermore, it is even more effective to reduce the rotational torque of the disc and especially the non-woven liner 1 by impregnating the fibers with a PI agent to improve the properties of the disc and especially the non-woven liner 1 itself. ?The i agent is silicone oil.

Hydrocarbons such as liquid paraffin and squalane, fatty acids such as oleic acid, fatty acid esters such as oleyl oleate and butyl stearate, etc. It is preferred to use a proportion of ~10%.

Next, some specific examples of disk carts/nozzles to which the present invention is directed will be explained based on the drawings.

The disk cartridge shown in FIGS. 4 to 8 is a flat rectangular hard case-type disk case made by combining upper and lower plastic cases lla and 11b with lids and joining them together by ultrasonic welding at several points P. 11, and a magnetic disk 12 rotatably housed in the disk case 11.

This disk case 11 has a drive shaft insertion window 13 located in the center near the front, a magnetic head insertion window 14 located in front of the drive shaft insertion window 13 and long from front to back, and a rear part of the drive shaft insertion window 13. The index hole 15 has a small-diameter index hole 15 located therein, and these windows and holes are provided vertically through each other.

In FIG. 6, the disk 12 is made up of a disk-shaped magnetic sheet 16 with a hole in the center and a hub 17 that clamps the periphery of the center hole of the sheet 16. Double-sided recording can be performed by inverting the two-disk case 11. is possible. This sheet 16 has a magnetic layer coated on both sides of the base film, and is elastically deformed as a whole.

Upper and lower cases 11a and 11 that constitute the disk case 11
On each inner surface of the drive shaft insertion window 13, outer circumferential walls 18 and 8 concentric with the outer periphery of the drive shaft insertion window 13 are protruded and abutted against each other. facing the drive shaft insertion window 13, no)
- 16 rotates inside the outer peripheral wall 18.

In FIG. 6, the hub 17 of the disk 12 is shown.

It consists of an upper hub structure 20 and a lower hub structure 21 which are separately molded in plastic and are inseparably joined together.The periphery of the central hole of the magnetic sheet 16 is located at the opposing surface of the two hub structures 20 and 21. The parts are clamped and held.

When the disc cartridge of the present invention is loaded into a magnetic recording device, the bifurcated drive shaft on the magnetic recording device side is inserted into the center hole 2 of the hub 17.
2 and the outer periphery of the disk 12, respectively, to rotate the entire disk 12.

In FIG. 5 and FIG. 8, the upper and lower cases 11a and 11
b on the inner surface of the outer peripheral wall 18.

The above-mentioned non-woven fabric liner 1 cut into small pieces is pasted on the rear left and right center area, that is, the position facing the magnetic head insertion window 14, and the non-woven fabric liners 1a and 1b, also cut into small pieces, are pasted on the left and right almost opposing positions. be. However, while the left and right liners 1a and 1b are attached directly to the flat inner surface of the case, the rear liner 1 is attached to the left and right longitudinal ribs 32 and 32 that protrude from the inner surface of the case, and these ribs 32, 32, the protrusion height of the rear liner 1 from the inner surface of the case is set higher than that of the left and right liners 1a-1b.

The ribs 32, 32 protruding from the upper and lower cases 11a, 11b are arranged so as to alternately engage with each other on a virtual circumference line around the center of the drive shaft insertion window 13.

In such a case, when the disc cartridge of the present invention is loaded into a magnetic recording device and the disc 12 is driven to rotate, the rear liners 1 located above and below strongly contact both sides of the sheet 16 of the disc 12, and the liners 1a-Ia on the left and right come into contact with each other. 1 bib
The sheet 16, which is sandwiched between the linats 1 at the rear, is deformed into a wavy shape and rotated, as shown in FIG. 8. As time goes on, the dust that has adhered to the surface of this will be removed. The left and right liners 1a and 1b only assist in cleaning the disk surface, and mainly clean the sheet 1.
Suppresses the ripples that appeared on 6.

It works to improve the contact of the magnetic head with the sheet surface. The reason why the rear Ripe River is arranged at the opposite position farthest from the magnetic head insertion window 14 is to prevent the undulations that occur on the sheet 16 due to this cleaning from reaching the position where the magnetic head insertion window 14 is arranged. This is to suppress the In this example, the left and right liners 1a-1b are not necessarily required.

The disk cartridge shown in FIG. 9 is basically the same as the one described above, but the shape of the non-woven fabric liner 1 and the way it is applied have been changed. A non-woven fabric liner 1 is attached to the latter half of the disk rotation area in the outer peripheral wall 18, and the ribs 32, 32 described above are arranged in the same way at a position facing the magnetic gutter insertion window 14, and the ribs 32, 32 The rear center portion of the liner 1 where the sheet is present is set one step higher than the other portions, and the sheet surface is locally cleaned at the corresponding portion.

The disk cartridge shown in FIG. 10 is a general-purpose floppy disk, and a disk-shaped magnetic disk (magnetic sheet) 12 is rotatably installed inside a flexible disk case 11 made of vinyl chloride. The above-mentioned non-woven fabric linat 1 is attached to the upper and lower inner surfaces, and this linat 1
is in full contact with the disk surface,
This is also within the scope of the invention.

In the present invention, when the above-mentioned nonwoven fabric liner 1 is attached to these various disk cartridges, the liner 1 can be made thicker to have better properties, and it can be imparted with John's strength, and in particular, the polyester long fibers can effectively act on the disk surface. , outstanding cleaning performance can be expected while keeping the rotational torque of the disk 12 low. Furthermore, due to the entanglement with the polyester long fibers 3, the acrylic short fibers 2 were completely prevented from falling off.

In order to confirm the effects of the present invention, the results of experiments using Examples and Comparative Examples are shown below.

Embodiment 1 In the disk cartridge shown in FIGS. 4 to 8, claws with a width of 2 m left and right are provided on each of the upper and lower inner surfaces of the disk case 11 facing the magnetic head insertion window 14.

Rib 3 with front and rear length 15**, height 0.1~0゜0++m
232, and on these ribs 32, 32, the nonwoven fabric liner 1, which had been cut into small pieces with a thickness of 0.6+n and a width of 20 x 30 mm, was attached in a vertically opposed manner as described above. However, the fiber composition ratio of the nonwoven fabric liner 1 is as follows.

Fiber composition of non-woven liner: Acrylic short fibers 40% (0,
1 denier, length 30 m) Polyester long fiber 55% (2 denier, 36 filaments) Urethane resin 5% Example 2 The nonwoven fabric liner 1 having the above composition was impregnated with 0.5% silicone oil (hydrogen polysiloxane). The same procedure as in Example 1 was carried out.

Example 3 The same procedure as in Example 111 was carried out except that the nonwoven fabric liner was impregnated with oleyl oleate instead of the silicone oil in Example 2.

Comparative example (conventional example) N0VONETTE9302 manufactured by Kendall, which has a composition ratio of rayon fiber and polypropylene fiber of 80:20.
Using a non-woven fabric liner (thickness 0.2m), the ribs 3
The same procedure as in the example was carried out except that the height of 2 was set to 0.1 to 1 and 0++ m.

The disk cartridges obtained in each of the Examples and Comparative Examples of the present invention were loaded into a magnetic recording device, and the relationship between the disk rotation torque and the number of dropouts was investigated. FIG. 11 shows the results.

As is clear from this figure, although it depends on the height of the rib 32 in the disk cartridges according to each embodiment of the present invention, the disk rotation torque is generally smaller than that of the comparative example (conventional example), and even with small disk rotation torque, there is a drop. The number of outs has decreased significantly. The reduction in the number of dropouts indicates that the disk surface cleaning performance of the nonwoven fabric liner according to the present invention (911) is good.

The fact that the disk rotation torque is small means that the load placed on the disk drive motor is small, leading to stable disk running characteristics. Furthermore, even after testing under harsh conditions, no fibers were found to fall off from the nonwoven fabric liner according to the example of the present invention, and in this respect, unlike the conventional example, it guarantees stable cleaning performance over a long period of time. It was confirmed that

[Brief explanation of the drawing]

Figures 1 to 3 show the nonwoven liner used in the present invention, with Figure 1 being a schematic longitudinal cross-sectional view, Figure 2 being a microscopic photograph of the surface of the nonwoven liner, and Figure 3 also showing the nonwoven liner. It is a micrograph showing the cut end surface in the longitudinal direction. 4 to 8 show a disc car according to the present invention 1-
A specific example of the ridge is shown, and Fig. 4 is an external perspective view;
5 is a plan view showing the internal structure, FIG. 6 is a sectional view taken along line A-A in FIG. 5, FIG. 7 is a sectional view taken along line B-B in FIG. 5, and FIG. 8 is a sectional view taken along line C in FIG. -C line sectional view. FIG. 9 is a plan view showing another specific example of the disk cartridge according to the present invention. FIG. 10 is a plan view showing still another specific example of the disk cartridge according to the present invention. FIG. 11 is a diagram showing the relationship between the disk rotation torque and the number of dropouts in Examples 1, 2, and 3 of the present invention and a comparative example. 1...Nonwoven liner. 2...Acrylic staple fiber. 3...Polyester long fiber. 4...Bundle of polyester long fibers. 11...Disc case. 12...Disk. Figure 2 Figure 3 Figure 4 Figure 5 Figure 10 Figure 11 Figure 11 Disk rotation torque (f-mouth)

Claims (1)

[Scope of Claims] (1) A disc cartridge in which a disc 12 is rotatably housed in a disc case 11, and a non-woven fabric liner made of synthetic resin fiber that contacts the disc surface is attached to the inner surface of the disc case 11. The liner 1 includes thin synthetic resin fibers 2 forming the front and back surfaces, and a bundle 4 of thick synthetic resin long fibers 3 intertwined between the thin synthetic resin fiber groups and intertwined inseparably with the thin synthetic resin fiber group. 1. A disk cart reno, which is characterized in that the thickness is set to 0°311w1 or more. (2) The thin synthetic resin fibers 2 are acrylic fibers of 0.05 to 0.3 deniers and the length of 1 to 5 WI11, and the thick synthetic resin fibers 3 are polyester long fibers of 0.5 to 5 deniers and 10 The disk cartridge according to claim 1, which is in the form of a bundle of ~50 disk cartridges.