JPH10162542A - Disc cartridge and linear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liner formed of a plastic sheet such as a fluorine plastic sandwiching a disk which does not generate duct by itself while protecting a disc by arranging such liner within a cartridge. SOLUTION: Linears 6a, 6b formed of plastic sheet are adhered to the internal surfaces of upper shell 3 and lower shell 4 to sandwich a disc 2 as a magnetic medium provided as a center core 7 from the upper and lower directions. In regard to the shape of liner 6, it may cover the entire surface of the disc 2, except for the head window or may be a semi-circular shape with a part of it arranged to the shell under the condition the disk 2 does not in contact with the shells 3, 4. Particularly, as the material of liner 6, it is preferably to select those having a small friction coefficient and having excellent non-charging property, non-adhesion property and higher heat resistance. Tetrafluoroethylene film has a very small friction coefficient and assures good slipping property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk cartridge or a magneto-optical cartridge for a magnetic recording / reproducing apparatus in which a recording medium is housed in a cartridge, and a liner used for the cartridge.

[0002]

2. Description of the Related Art Saving data of a computer or the like,
In a magnetic disk cartridge or a magneto-optical cartridge, for example, in the case of the floppy disk 1a shown in FIG. 3, the rotation speed of the disk 2 is rapidly increased to 300 to 2000 rpm in order to realize a high transfer rate with the increase in capacity. I have. Liners 5a and 5b made of nylon or PET fiber are adhered inside the upper and lower shells 3 and 4, respectively. The role of the liners 5a, 5b is to clean and protect the surface of the disk 2.

The problem here is that the liners 5a and 5b adhered to the upper and lower shells 3 and 4 generate dropouts due to dust generated from the liners 5a and 5b themselves. Liner 5a,
In the structure 5b, fine fibers of about 10 to 15 μm are entangled. In this liner, dust (mainly fiber pieces) generated during the manufacturing process due to sticking to the shell or vibration from the outside is retained inside the liners 5a and 5b, and the dust may drop onto the disk 2. I do. The dropouts are stuck on the disk 2 or driven by the head to cause dropout. For example, the size of the dropout of the liner that is dropped out on the floppy disk 1a is often about 10 to 20 μm.
In the future, as the capacity of the magnetic disk or the magneto-optical cartridge increases, the size of the dropout-causing material affects even smaller ones. Therefore, dust generation from the liner itself becomes more and more problematic.

FIGS. 4A and 4B show MFD (Micr).
1A and 1B are a plan view and a side cross-sectional view of a liner 5 used in a floppy disc, wherein the liner 5 is shaped to cover a disk and has a structure of about 10 to 15 μm.
Since the fibers of nylon or PET (polyethylene terephthalate) having a small thickness are entangled with each other, the fiber pieces drop off onto the disk due to sticking to the shell or vibration from the outside. The dropped matter sticks on the disk or is hit by the head, causing dropout. In particular, the fiber pieces often fall off at the edge of the liner 5.

[0005]

The problem to be solved by the present invention is to provide a disc force cartridge with a liner that protects the disc but does not generate dust from itself.

[0006]

A liner made of a plastic sheet such as a fluorine-based resin is disposed in a cartridge so as to sandwich a disk, so that dust is not generated from the liner in the disk cartridge.

[0007]

Embodiments of the present invention will be described below. Here, a 3.5-inch MFD (Micr
o Floppy Disc) will be described as an example of installation in a disk cartridge. 1 (a) and 1 (b) are a side sectional view of a disk cartridge of the present invention and a plan view with an upper shell removed, and FIGS. 2 (a) and 2 (b) are a plan view and a side sectional view of a liner. A liner 6a made of a plastic sheet on the inner surfaces of the upper shell 3 and the lower shell 4.
6b is adhered, and the disk 2 which is a magnetic medium formed in the center core 7 is sandwiched from above and below.

The shape of the liner 6 may be such that it covers the entire surface of the disk 2 except for the head window 8, or if the disk 2 and the shells 3 and 4 are not in contact with each other, a portion such as a semicircle may be arranged in the shell. .

In particular, as the material of the liner 6, it is necessary to select a material having a small coefficient of friction and excellent in non-charging property, non-adhesive property and heat resistance. For example, a tetrafluoroethylene film (hereinafter referred to as a Teflon film), which is a fluororesin film, has a very small coefficient of friction and good slip properties. This is a very important factor in protecting the magnetic disk. In addition, although it has excellent non-adhesiveness and heat resistance, the non-chargeability is not so good, the electric resistance is 10 ¹⁸ Ω / sq, and is shown in the charged column table of Table 1. Therefore, the compatibility with PET as the base of the disk 2 is not good. (Use of the opposite side of the charging line cancels mutual charging.) Therefore, a Teflon film coated or kneaded with an antistatic agent or a film subjected to corona discharge treatment is used.

[0010]

[Table 1]

Table 2 shows the number of dust particles adhering to the liner of the present invention made of a conventional nonwoven liner and Teflon. The size of the test sample was 90 mm in diameter.
It is. As can be seen from these results, the conventional liner itself has a large amount of dust that has fallen off during the manufacturing process or due to vibrations, etc., and there is a concern that it will adhere to the magnetic disk and drive in due to the head. You. On the other hand, it is shown that the liner made of the plastic sheet of the present invention has a very small number of dust particles, and there is no fear of an increase in the number of dust particles due to vibration or the like, and data errors due to dropout are reduced.

[0012]

[Table 2]

As described above, by arranging a cushioning, non-chargeable plastic sheet in such a manner as to sandwich a magnetic disk inside the disk cartridge,
Dust generated from the inside of the disc cartridge due to vibrations from the time of sticking to the disc cartridge or from the outside is prevented from dropping onto the disc, and data errors due to dropout are reduced.

[0014]

According to the present invention, dust is not generated from the liner,
A disk cartridge with few data errors due to dropout can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view and a plan view of a disk cartridge according to the present invention.

FIG. 2 is a plan view and a side sectional view of a liner according to the present invention.

FIG. 3 is an exploded perspective view of a normal disk cartridge.

FIG. 4 is a plan view and a side sectional view of a conventional liner.

[Explanation of symbols]

1a Floppy disk, 2 disk, 3 upper shell, 4 lower shell, 5, 5a, 5b, 6, 6a, 6b
... Liner, 7 ... Center core, 8 ... Head window

Claims (4)

[Claims] 1. A disk cartridge, wherein a liner made of a plastic sheet is arranged in the cartridge so as to sandwich the disk. 2. The disk cartridge according to claim 1, wherein said liner is made of a fluorine-based resin. 3. The liner made of the fluorine-based resin is subjected to an antistatic treatment.
A disc cartridge according to claim 1. 4. A liner made of a fluorine resin and subjected to an antistatic treatment.