JPH03187077A - Disk cartridge - Google Patents

Abstract

PURPOSE:To improve corrosion resistance by impregnating a specific compd. into the member in the disk cartridge case or into the case itself. CONSTITUTION:The member contg. glycidyl group-contg. compd. is disposed in the case of the disk cartridge or the glycidyl group-contg. compd. is incorporated into the case itself, by which the excellent corrosion resistance to the chlorine in the atm. air is exhibited. For example, an elastic piece 13 for bringing a cleaning sheet 11 into press contact with a magnetic disk 3 or the like is adequately usable as the member contg. the glycidyl group-contg. compd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge that rotatably accommodates a magnetic disk within a hard or soft case and further includes a cleaning sheet inside.

More particularly, the present invention relates to a disk cartridge that exhibits excellent corrosion resistance against atmospheric chlorine.

[Prior Art] A disk cartridge is a cartridge containing one magnetic disk, and is used in small magnetic disk devices. Depending on the type of magnetic disk, it is broadly divided into hard disk cartridges and flexible disk cartridges.

In the case of a flexible disk cartridge, as shown in FIG. 1, a flexible magnetic disk 3 is housed inside a case 1 called a jacket made of plastic resin (eg, vinyl chloride). A magnetic head (not shown) is attached to the magnetic surface of this magnetic disk 3.
The case is provided with a head window 5 for sliding contact. Further, a central window 7 for engaging a rotation drive means (not shown) for rotating the magnetic disk with the magnetic disk 3 and an index window 9 for detecting a rotation reference position are provided.

As shown in FIG. 2, the magnetic disk 3 rotates while being cleaned by a cleaning sheet 11 made of a nonwoven fabric called a liner. In order to effectively perform this cleaning, if necessary, as shown in FIG.
It is also possible to forcibly bring the 2-noning sheet 11 into contact with the magnetic disk 3 by the 3 and the protrusions 15. In FIG. 3, on the inner surface of the 8th surface (side 1) 17b of the case 1,
In addition, a protruding support part 19 and a protruding protrusion 21 for preventing sticking are provided on the A surface (side 0) 17a of the case 1 at a position substantially opposite to the protrusion 15. Base 2 of elastic piece 13
3 is fixed to the inner surface of the eighth surface (side 1) 17b of the case 1 and near the support portion 19. The free end 25 of the elastic piece 13 is supported by the support portion 19 to maintain its inclined state. With this configuration, the cleaning sheet 11 is partially lifted from the case 8 surface 17b by the elastic piece 13, and the lifting is slightly pushed down by the protrusion 15 provided on the case A surface 17a, so that the magnetic disk 3 is It is elastically clamped by the upper and lower cleaning sheets) 11.11. As the magnetic disk 3 rotates, both surfaces of the disk are cleaned by the cleaning sheet 11.

[Problems to be Solved by the Invention] There are two types of magnetic recording media: a coated type in which a mixture of ferromagnetic metal powder and a binder is coated on a nonmagnetic substrate, and a thin film type in which a ferromagnetic metal is deposited on the surface of a nonmagnetic substrate. be. However, these media are susceptible to corrosion because their magnetic layers are exposed.

To solve this drawback, a lubricant layer and/or
Alternatively, methods of providing a rust preventive layer or forming a Cr segregation film have been tried, and a certain degree of corrosion prevention effect has been achieved.

However, the magnetic layer of the magnetic disk is still susceptible to corrosion by chlorine compounds (eg, hydrogen chloride) in the air, and magnetic properties such as maximum magnetic flux density tend to deteriorate. The above-mentioned methods clearly had insufficient anticorrosion effects against such chlorine compounds.

Therefore, an object of the present invention is to provide a disk cartridge having excellent corrosion resistance against atmospheric chlorine and the like.

1 [Means for Solving the Problem] In order to achieve the above object, the present invention provides at least the following:
In a disk cartridge consisting of a case, a magnetic disk rotatably housed in the case, and a cleaning sheet affixed to the inner surface of the case, a member containing a glycidyl group-containing compound is provided in the cartridge case or To provide a disk cartridge characterized in that a glycidyl group-containing compound is added to at least a portion thereof.

Preferably, the disc cartridge is a flexible disc cartridge.

[Function] As described above, in the disk cartridge of the present invention, a member containing a glycidyl group-containing compound is disposed within the case, or the glycidyl group-containing compound is added to the case itself, so that atmospheric chlorine is not affected. It shows excellent corrosion resistance.

Although the exact mechanism has not yet been elucidated and is still in the realm of speculation, it is believed that free chlorine ions are fixed by the reaction between the glycidyl group and hydrogen chloride as shown below, and corrosion is prevented. Seem.

Glycidyl group-containing compounds which can be suitably used in the present invention include, for example, epoxidized D-oil or glycidyl esters of oleic acid, myristic acid or stearic acid.

Examples of members containing glycidyl group-containing compounds include:
An elastic piece 13 as shown in FIG. 3 can be suitably used to press the cleaning sheet against the magnetic disk.

Alternatively, a glycidyl group-containing compound can be included in the front and/or back side components of the case.

When the elastic piece and the case as described above are made of plastic material, a glycidyl group-containing compound is mixed with the plastic raw material before molding, and this mixture is molded by a commonly used molding method such as injection molding, injection molding, or compression molding. Can be manufactured. The glycidyl group-containing compound can also be included in, for example, cyclodextrin and mixed with a plastic material.

Alternatively, the glycidyl group-containing compound can be mixed with a suitable high-viscosity substance, and this mixture can be applied to the inner wall surface of the case.

As shown in FIG. 4, the cleaning sheet 11 generally includes a disk side nonwoven fabric 27 facing the magnetic disk 3, a case side nonwoven fabric 29 facing the case 1, and the disk side nonwoven fabric 27 and the case side nonwoven fabric 29. It is preferable to have a three-layer structure including an intermediate nonwoven fabric layer 31 for mutual adhesion.

The nonwoven fabric constituent material itself used in the disk cartridge of the present invention does not need to be special.

All common nonwoven construction materials traditionally used in the field of magnetic recording media can be used in the disk cartridge of the present invention.

For example, both the disc-side nonwoven fabric layer 27 and the case-side nonwoven fabric layer 29 may be made of rayon fiber alone. This type of structure with no front and back sides is extremely convenient since there is no need to inspect the front and back sides of the nonwoven fabric when installing the cleaning sheet in the case. As a rayon fiber,
Viscose rayon, copper ammonia rayon, acetate rayon, etc. can be used. In the present invention, both the disk-side nonwoven fabric layer 27 and the case-side nonwoven fabric layer 29 are preferably composed of nonwoven fabrics whose single fibers have a tensile elongation of 50% or more.

The intermediate nonwoven fabric layer 31 can also be composed of a mixed fiber layer of rayon fibers and polyamide fibers. The mixing ratio of rayon fiber and polyamide fiber is generally about 1/9 to 9/1.
It is particularly preferably within the range of 3/7 to 7/3.

For the intermediate nonwoven fabric layer 31, in addition to the mixture of rayon fiber and polyamide fiber as described above, various thermoplastic resins such as polyethylene terephthalate, polyethylene, polypropylene, polystyrene, polyvinyl chloride, and acrylic resin can also be used. .

The cleaning sheet 11 can be made of rayon fiber alone, but by providing an intermediate nonwoven fabric layer 31 made of a nonwoven fabric containing a thermoplastic resin between the disk side nonwoven fabric layer 27 and the case side nonwoven fabric layer 29, the cleaning sheet 11 can be made of rayon fiber alone. Thermal adhesion properties are improved.

[Example code] The present invention will be explained in more detail with reference to Examples.

After cross-dispersing a composition consisting of the following ingredients in the L breath,
A magnetic layer was formed by coating both sides of a 75 μm thick polyethylene terephthalate film to a thickness of 2.5 μm. Next, this was punched out into a disk shape with a diameter of 88 m+= to produce a magnetic disk.

A disk cartridge was prepared by housing the magnetic disk in a cartridge whose inner surface was affixed with a nonwoven fabric made of rayon fiber and polyamide fiber impregnated with epoxidized soybean oil as a cleaning sheet.

Isshu Zaihoichi Metal Magnetic Powder 100 PVC/Vinyl Acetate/Vinyl Alcohol Copolymer 14 Polyurethane Resin 8.53 Functional Incyanate Crosslinking Agent 5.5AJ203
20 fatty acid esters
8 Ncrohexanone 180
Toluene 180 The above cartridge case was manufactured by compression molding a mixture of ABS resin and 1 part by weight of polyglycidyl methacrylate.

A disk cartridge was produced in the same manner as in Example 1, except that a cartridge case made only of ABS resin was used.

Each disk cartridge obtained as described above was
0℃, 70%RH, CJ! 210PPB.

After being left under the conditions of 10 PPB of H2S and 100 PPB of NO2 for 7 days, the change in maximum magnetic flux density was measured using a sample vibrating magnetometer. The results are summarized in Table 1 below.

As is clear from the above results, a disk cartridge whose cartridge case contains a glycidyl group-containing compound exhibits superior corrosion resistance in a chlorine-containing atmosphere compared to a disk cartridge whose case is made only of conventional plastic materials. .

Although the present invention has been described in detail with respect to a flexible disk cartridge, the present invention can be implemented similarly with respect to a node disk cartridge.

Further, the size of the cartridge does not matter when implementing the present invention. A disk of 8 inches or larger (e.g. 1
The present invention can be implemented with all hard and flexible magnetic disks that are actually used, such as disks of 2 inches or smaller (for example, 2 inches) or smaller than 3.5 inches (for example, 2 inches).

The magnetic layer of the magnetic disk may be either a coating type or a thin film type.

[Effects of the Invention] As explained above, according to the present invention, by providing a member containing a glycidyl group-containing compound in the case or by including a glycidyl group-containing compound in the case itself, chlorine in the atmosphere can be reduced. A disc cartridge/solid body having excellent corrosion resistance against corrosion can be obtained.

[Brief explanation of drawings]

Figure 1 is a rear view of a conventional flexible disk cartridge, Figure 2 is a cross-sectional view taken along the line ■-■, and Figure 3 is a state in which the cleaning sheet is forced into sliding contact with the magnetic disk. FIG. 4 is a partial cross-sectional view of an example of the nonwoven fabric used in the present invention. 1... Jacket (case), 3... Magnetic disk. 5... Head window, 7... Central window, 9... Index window. 11...Cleaning sheet, 13...Elastic piece. 15...Protrusion, 17a...Jakera 1B side. 17a... Jacket A side, 19... Support part. 21... Convex strip, 23... Elastic piece base. 25...Free end of elastic piece, 27...Disk side nonwoven fabric layer.

Claims (3)

[Claims] (1) In a disk cartridge consisting of at least a case, a magnetic disk rotatably housed in the case, and a cleaning sheet affixed to the inner surface of the case, a member containing a glycidyl group-containing compound is provided in the cartridge case. 1. A disc cartridge characterized in that a glycidyl group-containing compound is added to at least a portion of the case. (2) The disk cartridge according to claim 1, wherein the disk cartridge is a flexible disk cartridge. (3) The disk cartridge according to claim 1, wherein the disk cartridge is a hard disk cartridge.