JPH076543A - Disk cartridge - Google Patents

Abstract

PURPOSE:To obtain the disk cartridge excellent in recording and reproducing characteristics without molding the surface of a magnetic disk even when the cartridge is left under a high temp. and high humidity environment as it is by suppressing a data error caused by mold grown on the magnetic disk surface. CONSTITUTION:In the disk cartridge, a moldproof agent is held by a cleaning liners 11 and 12 and/or the cartridge 1. For the moldproof agent, 2- metoxicarbonyl aminobenzimidazoled decylbenzene sulfonate or 2,3,4-triiodoallyl alcohol or the like is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge and, more particularly, to improvement of mold resistance.

[0002]

2. Description of the Related Art For example, a magnetic disk (so-called floppy disk) having a magnetic coating mainly composed of ferromagnetic powder and a binder is formed on a disk-shaped flexible non-magnetic support.
Conventionally, in order to prevent the dust from being attached to the magnetic disk and being damaged by the contact of fingers and the like, and in order to facilitate the handling, the magnetic disk is housed in a case-shaped cartridge and handled as a disk cartridge.

That is, a cartridge used for accommodating the magnetic disk is composed of an upper half and a lower half which are paired with each other, and the upper half and the lower half are butt-joined with the magnetic disk sandwiched therebetween. It is designed to hold a magnetic disk.

Recording and reproducing openings for exposing at least a part of the signal recording surface of the magnetic disk to the outside are provided in the main surfaces of the upper and lower halves, and the recording and reproducing openings are provided. The information signal is written and / or read on the signal recording surface via the section.

Further, such a cartridge is usually provided with a cleaning liner made of rayon fiber or the like for removing dust that has entered the cartridge and adhered to the signal recording surface of the magnetic disk. This cleaning liner is affixed to one main surface of the cartridge where the magnetic disks of the upper half and the lower half are stored, and the magnetic disk is sandwiched from the main surface side so that the surface is in contact with the magnetic disk. There is. Therefore, when the magnetic disk rotates, the dust adhering to the signal recording surface of the magnetic disk is wiped off by the wiping effect of the cleaning liner. This prevents the signal recording surface from being damaged by the magnetic head slidingly contacting the surface to which the dust is attached.

[0006]

By the way, in such a disk cartridge, the inside thereof is a closed space with little air flow. Therefore, when stored in a high temperature and high humidity environment for a long period of time, moisture is accumulated inside and a binder that constitutes the magnetic coating film of the magnetic disk housed therein or an organic compound such as a lubricant that is applied on the magnetic coating film. There is a problem that mold is used as a medium. The mold generated on the magnetic disk in this manner causes a contact rate between the magnetic head and the magnetic disk at the time of recording / reproducing to induce an error rate.

Therefore, a magnetic recording medium in which such a mold is prevented by holding a mildewproofing agent in the magnetic coating film is disclosed in JP-A-61-214212 and JP-A-2-49217. Have been proposed in. However, if the antifungal agent is held in the magnetic coating film, the magnetic properties of the magnetic coating film may be adversely affected by the antifungal agent, and the occurrence of mold may be prevented, but the recording and reproducing characteristics may be impaired. There is.

Therefore, the present invention has been proposed in view of such a conventional situation, and provides a disk cartridge which prevents generation of mold on a magnetic disk and is less likely to cause a data error during recording and reproduction. With the goal.

[0009]

In order to achieve the above-mentioned object, the present inventors conducted a detailed investigation on the distribution of molds generated on a magnetic disk, and found that the molds were particularly cleaned on the magnetic disk. It was found that the seedlings propagated in the contact area with the liner and the peripheral edge of the disc. this is,
Water tends to collect due to so-called capillary condensation around the contact area of the magnetic disk with the cleaning liner and in the gap between the magnetic disk peripheral edge and the cartridge. Also, the rayon fiber, which is often used for cleaning liners, has high water absorption and absorbs water. It is thought that this is because it is easy to hold. Therefore, paying attention to such a point, it was found that when a cleaning liner and a cartridge were made to hold a mildew proofing agent, the occurrence of mildew on the magnetic disk was significantly suppressed, and the data error during recording / reproduction was drastically reduced. It was

The present invention has been completed based on such findings, and a ferromagnetic powder is bonded to at least one surface of a non-magnetic support in a cartridge having a cleaning liner adhered to the inside. A disk cartridge containing a magnetic disk having a magnetic coating film mainly containing the agent, characterized in that an antifungal agent is held on the cleaning liner and / or the cartridge.

The antifungal agent is characterized by being 2-methoxycarbonylaminobenzimidazole dodecylbenzene sulfonate or 2,3,3-triiodoallyl alcohol.

[0012]

In a disk cartridge containing no fungicide, if left in a high temperature and high humidity environment, mold grows on the magnetic disk, especially at the contact portion with the cleaning liner and its peripheral portion. At this time, if the anti-mold agent is held on the cleaning liner and the cartridge, the anti-mold agent effectively prevents the generation of mold on the contact portion and the peripheral edge of the magnetic disk. Therefore, the contact failure between the magnetic disk and the magnetic head caused by the growth of mold on the magnetic disk is prevented, and the occurrence of data error is suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings.

The disk cartridge of this embodiment is shown in FIG. This disk cartridge comprises a housing-shaped cartridge 1 and a magnetic disk 2 rotatably housed therein.

The magnetic disk 2 is formed by forming a magnetic coating mainly composed of a ferromagnetic powder and a binder on a disk-shaped flexible non-magnetic support.

As the magnetic powder and the binder constituting the non-magnetic support and the magnetic coating film, any of those usually used in this kind of magnetic disk can be used.
For example, as the non-magnetic support, polyesters, polyolefins, celluloses, vinyl resins,
A polymer substrate formed of a polymer material typified by polyimides and polycarbonates can be used.

As the ferromagnetic powder, iron oxide type ferromagnetic powder, chromium oxide type ferromagnetic powder, metal type ferromagnetic powder,
Examples include hexagonal ferrite powder. As the binder, vinyl chloride, vinyl acetate, vinyl alcohol, vinylidene chloride, acrylic acid ester, methacrylic acid ester, styrene, butadiene, polymers such as acrylonitrile, or a copolymer obtained by combining two or more thereof, a polyurethane resin, Examples include polyester resins and epoxy resins.

In addition to the binder and the ferromagnetic powder, a dispersant, a lubricant, an abrasive, an antistatic agent, a rust preventive, etc. may be added to the magnetic coating film. Further, in the above-mentioned magnetic recording medium, a top coat layer made of a lubricant or the like is formed on the magnetic coating film or a non-magnetic support on the side opposite to the magnetic coating film in order to secure running property and durability. A backcoat layer made of an antistatic agent, an abrasive, or the like may be formed on the body as a topcoat layer.

A center portion of the magnetic disk 2 is a center hole, and a disk hub 4 having a chucking function is fixed to the magnetic disk 2 with a sliding ring 3 interposed therebetween. The chucked portion 2a is held by a disc player device that records and / or reproduces information signals. And
The peripheral side of the central portion to be the chucked portion 2a,
That is, the area where the magnetic coating film is formed serves as a signal recording surface 2b on which information signals are written and / or read.

On the other hand, the cartridge 1 for accommodating the magnetic disk 2 comprises an upper half 5 and a lower half 6 which are paired with each other. It is stored. The main surfaces of the upper half 5 and the lower half 6 are provided with recording / reproducing openings 7, 8 for exposing at least a part of the signal recording surface 2b of the magnetic disk 2 to the outside. Further, the lower half 6 is provided with a chucking opening 9 for exposing the disk hub 4 attached to the magnetic disk 2 to the outside. That is, the magnetic disk 2 holds the disk hub 4 through the chucking opening 9 by the disk player device, and the information signal to the signal recording surface 2b through the recording / reproducing openings 7 and 8. Writing and /
Alternatively, reading is performed. In the disk cartridge, in order to prevent dust from entering the cartridge 1 and protect the magnetic disk 2, a shutter member 10 for closing the recording / reproducing opening is used when not in use. Has been. The shutter member 10 is slidable along one edge of the lower half 6.

The material of the cartridge is AB
Examples of the thermoplastic resin include S resin (acrylonitrile-butadiene-styrene resin) and Hi-PS.

Further, in the disk cartridge, the magnetic disk 2 is inserted into the cartridge 1.
Cleaning liners 11 and 12 are provided for removing dust adhering to the signal recording surface 2b. The cleaning liners 11 and 12 are attached to one main surface of the upper half 5 and the lower half 6 on the side where the magnetic disk 2 is housed, and the magnetic disk 2 is sandwiched from the main surface side to the surface of the magnetic disk 2. Are placed in contact with each other. Therefore, when the magnetic disk 2 rotates, the dust adhering to the signal recording surface 2b of the magnetic disk 2 is wiped off by the wiping effect of the cleaning liners 11 and 12. This prevents the signal recording surface 2b from being damaged by the magnetic head slidingly contacting the surface to which the dust is attached.

As the cleaning liners 11 and 12, for example, rayon fiber, polyester fiber, polypropylene fiber, acrylic fiber, nylon fiber, etc., which are usually used as a cleaning liner material in a disc cartridge of this type, are used. Can also be used.

In the disk cartridge having the above construction, the mold 1 and / or the cleaning liners 11 and 12 hold an antifungal agent, which causes mold on the magnetic disk 2. Are prevented. That is, in a disk cartridge that does not use a mildew proofing agent, when left in a high temperature and high humidity environment, mold concentrates on the magnetic disk 2, especially at the contact portions with the cleaning liners 11 and 12 and the peripheral portions thereof. Occurs.

At this time, the cleaning liners 11, 1
2. If the antifungal agent is held in the cartridge 1, such a cleaning liner 1 on the magnetic disk
Generation of mold at the contact parts with 1, 12 and the peripheral part is effectively prevented by the fungicide. Therefore, the occurrence of a data error caused by the mold growing on the magnetic disk 2 can be suppressed.

The cleaning liners 11 and 12,
Examples of the fungicide held in the cartridge 1 include p-tolyldiiodomethylsulfone, 2,3,3-
Triiodoallyl alcohol, p-chloro-m-xylenol, 2-methoxycarbonylaminobenzimidazole dodecylbenzenesulfonate, butyl p-oxybenzoate, dehydroacetic acid, o-phenylphenol, 2
-(-4-thiazolyl) benzimidazole, α-bromocinnamaldehyde, N- (fluorodichloromethylthio) phthalimide, NN-dimethyl-N'-phenyl-N'-fluorodichloromethylthiosulfamide, 2
-Methoxycarbonylaminobenzimidazole dodecylbenzenesulfonic acid, 2-n-octyl-4-isothiazolin-3-one, 2,3,5,6-tetrachloro-4
(Methylsulfonyl) pyridine and the like can be mentioned.

In order to retain these antifungal agents on the cleaning liners 11 and 12, for example, the antifungal agent may be applied to the surface of the cleaning liner by a dipping method, a spray method, a roll coating method or the like.
On the other hand, in order to retain the antifungal agent in the cartridge 1, the antifungal agent may be applied to the surface by the dipping method or the spray method as in the case of the cleaning liner. It is also possible to internally add the fungicide by directly kneading it.

The antifungal agent may be held by both the cleaning liners 11 and 12 or the cartridge 1, or either one of them, but it goes without saying that the cleaning liners 11 and 12 and the cartridge 1 may be held.
Since it is more effective to retain the antifungal agent on both of the cleaning liners 11 and 12 and the cartridge 1 when there is a possibility that the cleaning liners 11 and 12 are left for a long period of time in a high temperature and high humidity environment. Is preferred.

The amount of the antifungal agent held is 0.01 to 1 with respect to 100 parts by weight of the cleaning liner fiber in both the cleaning liner and the cartridge from the viewpoint of obtaining a sufficient antifungal effect and practicality. About 100 parts by weight of cartridge resin and 0.01 parts by weight of resin
About 1 part by weight is suitable.

Next, a disk cartridge was actually manufactured, and the effect of holding the anti-mold agent on the cleaning liner and cartridge was examined.

First, a magnetic paint was prepared according to the following composition. Co-adhered γ-Fe ₂ O ₃ (manufactured by Titanium Industry Co., Ltd.) 100 parts by weight Nitrocellulose (manufactured by Asahi Kasei Corporation) 13 parts by weight Polyurethane resin (manufactured by Nippon Polyurethane Industry Co., Ltd.) 9 parts by weight Carbon Black (manufactured by Lion Akzo Co., Ltd.) 4 parts by weight Part α-Al ₂ O ₃ (Sumitomo Chemical Co., Ltd.) 10 parts by weight Isocetyl stearate (manufactured by Nippon Chemicals Co., Ltd.) 5 parts by weight Methyl ethyl ketone 110 parts by weight Cyclohexanone 110 parts by weight

5 parts by weight of a curing agent (polyisocyanate) was added to the prepared magnetic paint, and the mixture was uniformly mixed by stirring for about 30 minutes. Magnetic paint with this hardener added,
75 μm thick polyethylene terephthalate (PET)
It is coated on the film with a coating thickness of 1.5 μm and the temperature is about 80 ℃
And dried to form a magnetic coating film. After drying, the magnetic coating was similarly applied to the side of the PET film on which the magnetic coating was not formed and dried to form a magnetic coating. Then, the PET film having the magnetic coating film thus formed on both sides is subjected to calendering treatment to be mirror-finished, and then subjected to heat treatment for about 20 hours in a constant temperature bath set at a temperature of 60 ° C. After that, a magnetic disk was manufactured by punching into a disk shape having a diameter of 3.5 inches and further polishing the surface.

On the other hand, a cleaning liner made of a non-woven fabric made of various fibers and a cartridge made of ABS resin are respectively used as a fungicide, 2-methoxycarbonylaminobenzimidazole dodecylbenzenesulfonate, 2,
Any of 3,3-triiodoallyl alcohol was impregnated in a predetermined amount. Table 1 shows the types of fibers constituting the liner and the amount of the mold inhibitor impregnated in the liner and the cleaning disk (parts by weight relative to 100 parts by weight of the cartridge).
Shown in.

Then, the above liner, cartridge and magnetic disk were assembled in various combinations to prepare 3.5 inch floppy disk cartridges (Examples 1 to 8).

By observing the surface of the magnetic disk, the disk cartridge manufactured in this manner was left for 3 months with the magnetic disk in which mold had already been generated under the environment of temperature 30 ° C. and relative humidity 90%. The occurrence of mold was evaluated. The results are shown in Table 2.

For comparison, a cleaning liner,
Disc cartridges (Comparative Example 1 and Comparative Example 2) were prepared in the same manner as described above except that the cartridge was not impregnated with a mildew proofing agent, and the occurrence of mold after the standing conditions were evaluated. Table 1 shows the types of fibers constituting the liner, the amount of the mold preventive agent impregnated in the liner and the cleaning disk, and Table 2 shows the evaluation results of the mold generation conditions.

[0037]

[Table 1]

[0038]

[Table 2]

In Table 2, ◯ indicates that no mold was observed on the surface of the magnetic disk, and x indicates that mold was observed.

As shown in Table 2, in the disk cartridges of Examples 1 to 8 in which at least one of the liner and the cartridge was impregnated with a mildew proofing agent, no mold was observed on the surface of the magnetic disk. On the other hand, in the disk cartridges of Comparative Example 1 and Comparative Example 2 in which neither the liner nor the cartridge was impregnated with the mildew proofing agent, the generation of mold on the surface of the magnetic disk was clearly observed.

From this, it was confirmed that holding the antifungal agent on at least one of the liner and the cartridge is effective in preventing the occurrence of mildew on the magnetic disk.

[0042]

As is clear from the above description, in the disk cartridge of the present invention, since the cleaning liner and / or the antifungal agent is held in the cartridge, the disk cartridge is left in a high temperature and high humidity environment. However, the fungicide prevents the occurrence of mold on the surface of the magnetic disk. Therefore, it is possible to suppress the occurrence of a Dera error caused by the mold growing on the surface of the magnetic disk, and it is possible to obtain excellent recording and reproducing characteristics.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a disk cartridge to which the present invention is applied.

[Explanation of symbols]

 1 ... Cartridge 2 ... Magnetic disk 11, 12 ... Cleaning liner

Claims (2)

[Claims] 1. A cartridge contains a magnetic disk having a non-magnetic support and a magnetic coating film mainly composed of a ferromagnetic powder and a binder formed on at least one surface of the non-magnetic support. A disk cartridge having a cleaning liner on the side to be held, wherein the cleaning liner and / or the cartridge holds an antifungal agent. 2. The disk cartridge according to claim 1, wherein the antifungal agent is 2-methoxycarbonylaminobenzimidazole dodecylbenzene sulfonate or 2,3,3-triiodoallyl alcohol.