JPH0346175A - Magnetic disk cartridge - Google Patents

Abstract

PURPOSE:To block the influence of an external magnetic field on a magnetic disk housed in upper and lower hard cases by mixing a magnetic shield material to one of the resin made upper and lower hard cases at least. CONSTITUTION:An upper hard case 1 and a lower hard case 2 are made of resin mixing the magnetic shield material and on the inner faces of the cases 1 and 2, upper and lower liner sheets 6 and 7, which are composed of nonwoven fabric, to protect a magnetic disk 8. The disk is housed between the sheets 6 and 7. Even when cases applying a magnetic shield coating material to the inner and outer faces of the resin cases 1 and 2 are used instead of these cases 1 and 2, the same effect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic shield structure for a magnetic disk cartridge.

[Prior Art] FIG. 4 is an exploded perspective view of a conventional magnetic disk cartridge, and FIG. 5 is a perspective view of the same magnetic disk cartridge.

Referring to FIGS. 4 and 5, the conventional magnetic disk cartridge includes an upper hard case 1, a lower hard case 2 provided with a lifter 10, and an upper liner sheet 6 welded to the inner surface of the upper hard case 1. , a lower liner sheet 7 welded to the inner surface of the lower hard case 2, and a magnetic disk 8 provided with a center hub 9.

After the magnetic disk 8 is placed between the upper hard case 1 and the lower hard case 2, they are welded together and the shutter 5 is attached.

Conventional magnetic disk cartridges do not have magnetic shielding properties, and a magnetic disk cartridge storage container 11 made of a magnetically shielding steel plate is used only when storing the magnetic disk cartridge, as shown in FIG. For example, see Japanese Patent Publication No. 63-49297).

[Problems to be Solved by the Invention] Conventional magnetic disk cartridges do not have magnetic shielding properties, so if they are brought close to a magnet such as a motor while being carried, for example, data written on the magnetic disk inside the magnetic disk cartridge may be damaged. There was a problem that the data that had been saved would be erased.

Furthermore, conventionally, magnetic disk cartridge storage containers made of magnetically shielded steel plates have been used for storing and transporting magnetic cartridges, but there has been a problem in that the storage containers are expensive.

Therefore, an object of the present invention is to provide a magnetic disk cartridge in which the magnetic disk cartridge itself has magnetic shielding properties.

[Means for solving the problem] According to the invention described in claim 1, in the upper and lower hard cases,
A magnetic disk cartridge rotatably housing a magnetic disk is characterized in that at least one of the upper and lower hard cases made of resin is mixed with a magnetic shielding material.

According to the invention set forth in claim 2, in the upper and lower hard cases,
A magnetic disk cartridge I that rotatably houses a magnetic disk is characterized in that at least one of the inner and outer surfaces of at least one of the upper and lower hard cases is coated with a magnetic shielding paint. can get.

According to the invention described in claim 3, in the upper and lower hard cases,
A magnetic disk cartridge rotatably housing a magnetic disk, characterized in that a sheet-like magnetic shielding material is pasted on at least one of the inner and outer surfaces of at least one of the upper and lower hard cases. can get.

[Function] The upper and lower hard cases of the magnetic disk cartridge configured as described above block the influence of external magnetic fields on the magnetic disks housed in the upper and lower hard cases.

[Example] An example will be described with reference to the drawings. In the example shown in FIG. 1, the material of the upper hard case 1 and the lower hard case 2 is a resin mixed with a magnetic shielding material, and the hard case 1. Upper and lower liner sheets made of non-woven fabric to protect the magnetic disk 8 are placed on the inner surface of the case 6.
A magnetic disk cartridge 7 is fixed by heat welding or ultrasonic welding, and has a magnetic disk 8 housed between upper and lower liner sheets 6 and 7.

Incidentally, examples of magnetic shielding materials include permalloy, sendust, iron silicon, and ferrite.

The embodiment shown in FIG. 2 is a magnetic disk cartridge in which magnetic shielding paints 3a, 3b are applied to the inner and outer surfaces of upper and lower hard cases 1.2.

The magnetic shielding paint may be applied to at least one of the inner and outer surfaces of the upper and lower hard cases 1.2. As the magnetic shielding paint, a paint made by kneading the above-mentioned magnetic shielding material fine powder and a binder is suitable.

In the embodiment shown in FIG. 3, sheet-like magnetic shielding materials 4a are provided on the inner and outer surfaces of the upper and lower hard cases 1.2.

This is a magnetic disk cartridge with 4b attached. In addition, the sheet-shaped magnetic shielding material is attached to the upper and lower hard cases 1.2.
It is sufficient if it can be attached to at least one of the inner and outer surfaces of the As the sheet-shaped magnetic shielding material, a sheet formed by mixing the fine powder of the above-mentioned magnetic shielding material and a resin is suitable.

As explained above using the embodiments, as a means for imparting magnetic shielding properties to the magnetic disk cartridge, there is a method characterized by mixing a magnetic shielding material into the resin that is the material of the hard case (hereinafter, the first ), and a means characterized by applying magnetic shielding paint to at least one of the inner and outer surfaces of the node case (hereinafter referred to as means).
There is a method (hereinafter referred to as the third means) characterized by pasting a sheet-like magnetic shielding material on at least one of the inner and outer surfaces of the hard case.

In each of the embodiments shown in FIGS. 1 to 3,
Although the same means is used for the upper and lower hard cases to provide magnetic shielding properties to the upper and lower hard cases, it is not necessarily necessary to use the same means for the upper and lower hard cases.

For example, if the first method is applied to one hard case, the second or third method can be applied to the other hard case.

In addition, if a second method is taken for one hard case,
The first means or the third means can also be applied to the other hard case.

Furthermore, if a third measure is taken for one of the hard cases,
The first means or the second means can also be applied to the other hard case.

[Effects of the Invention] The magnetic disk cartridge of the present invention has 5. This has the effect of blocking the influence of magnetic fields from outside the hard case on the magnetic disk housed within the hard case.

Furthermore, the magnetic disk cartridge of the present invention has the advantage that it does not require a dedicated storage container made of an expensive magnetically shielded steel plate.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a magnetic disk cartridge composed of upper and lower hard cases 1.2 made of resin mixed with magnetic shielding material, and FIG. 2 is a magnetic shielding paint 3a,
3b is a sectional view showing an embodiment of a magnetic disk cartridge coated with sheet-like magnetic shielding material 4a,
4b is an exploded perspective view of a conventional magnetic disk cartridge, FIG. 5 is a perspective view of the conventional magnetic disk cartridge, and FIG. 6 is an exploded perspective view of the conventional magnetic disk cartridge. FIG. 2 is a perspective view showing a conventional magnetic disk cartridge and a storage container for storing the magnetic disk cartridge. 1... Upper hard case, 2... Lower hard case, 3
a, 3b... Magnetic shielding paint applied to the hard case surface, 4a, 4b... Sheet-like magnetic shielding material affixed to the node case surface, 5... Shutter 6... Upper liner Seat, 7...Lower liner sheet, 8...Magnetic disk, 9...Center knob, 10...Lifter 11...Magnetic disk cartridge storage container composed of a magnetically shielded steel plate.

Claims (1)

[Claims] 1. A magnetic disk cartridge in which a magnetic disk is rotatably housed in upper and lower hard cases, characterized in that at least one of the upper and lower hard cases made of resin is mixed with a magnetic shielding material. magnetic disk cartridge. 2. A magnetic disk cartridge in which a magnetic disk is rotatably housed in the upper and lower hard cases, characterized in that at least one of the inner and outer surfaces of at least one of the upper and lower hard cases is coated with magnetic shielding paint. magnetic disk cartridge. 3. In a magnetic disk cartridge in which a magnetic disk is rotatably housed in the upper and lower hard cases, a sheet-like magnetic shielding material is attached to at least one of the inner and outer surfaces of at least one of the upper and lower hard cases. A magnetic disk cartridge featuring: