JPS6323817Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small floppy disk in which a magnetic disk is rotatably housed in a hard case (hereinafter referred to as hard case) made of hard plastic or the like.

Among floppy disks, so-called micro floppy disks and compact floppy disks have flexible magnetic disks housed in a hard plastic case, unlike conventional flexible jackets, making them easier to handle. There is an improved version of .

Conventional jackets are lined with a non-woven fabric with extremely high porosity called a liner, which removes dust adhering to the disk surface and stores it inside the liner to keep the disk surface always clean. The purpose was to improve reliability by maintaining

It is conceivable to line a hard case with a similar liner, but in this case, it is structurally difficult to make the contact between the liner and the magnetic disk as good as with a conventional flexible jacket, and for this reason, One method is to insert a flexible object, such as a bent plastic film, between the liner and the hard case to lift the liner and bring it into contact with the magnetic disk.

However, in this method, the contact pressure between the liner and the magnetic disk tends to be excessive, and as a result, the rotational torque of the magnetic disk becomes large, which may adversely affect the life of the magnetic disk. Another drawback was that the number of parts increased. Furthermore, because the cut end of the liner is near the opening into which the recording or playback head can be inserted, short fibers originating from fraying at the cut end are likely to come loose, which affects the reliability of the magnetic disk. The problem of giving remained.

The present invention provides a floppy disk with an extremely simple structure that improves the contact between the liner and the magnetic disk, enhances its surface cleaning effect, improves reliability, and solves the aforementioned problems. be.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows an example of the structure of a floppy disk according to the present invention, in which a is a plan view thereof, b is a cross-sectional view thereof, and c is a plan view of a magnetic disk housed in a hard case. In Figures 1 a to c, 1 is a hard case, 2 is an opening for inserting a head,
3 is a center opening for inserting a rotary drive shaft, and 4 is an opening for detecting an index hole, both of which are bored in both sides of the hard case 1. Reference numeral 5 represents a magnetic disk capable of recording on both sides, and reference numeral 6 represents a hub provided at the center of the magnetic disk 5. 7 is a substantially C-shaped liner, and a folded portion 8 is provided at the end thereof. This liner 7 is attached to the inside of the hard case 1 facing the magnetic disk 5 with an adhesive or the like. 9 is an index hole provided in the magnetic disk 5.

FIG. 2 is an enlarged partial sectional view taken along the line AB in FIG. For this reason, the folded portion 8 of the liner 7 swells with appropriate elasticity and comes into contact with the magnetic disk 5 from the front and back sides. Further, FIG. 3 shows an enlarged partial sectional view of another embodiment of the present invention, which illustrates a case where the folded portion 8 of the liner 7 is slightly shifted between the front and back sides. It goes without saying that the direction in which the liner 7 is folded is such that the cut end surface of the liner is hidden, that is, the direction in which it does not come into contact with the magnetic disk 5. Further, the number of times of folding is not necessarily limited to one, but can be repeated multiple times as necessary, thereby making it possible to adjust the contact pressure between the liner 7 and the magnetic disk 5. FIG. 4 shows an example in which the number of times of return is multiple times.
In FIG. 4, a shows a case where the tape is wound in the same direction, and b shows a case where the folding direction is alternately changed. In the latter case, the contact with the magnetic disk is softer than in the former. Further, the locations where the folded portions are provided are not limited to both ends of the liner punched into a substantially C-shape (or horseshoe shape), but may be provided at intermediate portions if necessary. Fifth
An example is shown in the figure. In either case, the folded portion is attached to the hard case at the contact portion using a method such as thermocompression bonding. Note that it is also important to consider the direction of rotation of the magnetic disk when determining the folding direction.

As described above, the present invention improves the contact between the liner and the magnetic disk and enhances the cleaning effect, but the contact is extremely soft and there is no risk of damaging the magnetic disk. In addition, when the folded part of the liner is placed near the head insertion opening, the cut part of the liner is not exposed as in the conventional example, and the resulting release of short fibers and the occurrence of errors are reduced. You can also get the effect of being Furthermore, it has the advantage that these improvements can be achieved without increasing the number of parts.

[Brief explanation of the drawing]

Figures 1a, b, and c are a plan view, a cross-sectional view, and a plan view of a magnetic disk, respectively, of an example of a floppy disk according to the present invention, and Figure 2 is a partially enlarged cross section taken along line A-B in Figure 1a. 3 are partially enlarged sectional views of other embodiments of the present invention, and FIGS. 4a, 4b, and 5 are sectional views of essential parts showing structural examples of the folded portion of the liner. 1... Hard case, 2... Opening for head insertion, 5... Magnetic disk, 7... Liner, 8...
...The folded part of the liner.

Claims (1)

[Scope of utility model registration request] A substantially C-shaped liner is provided on the inner surface facing the magnetic disk of a hard case rotatably housing a magnetic disk, and an opening for inserting a head formed in the case is located between the ends of the liner. and the end of the liner is folded back so that the cut end surface of the liner does not come into contact with the opening, and the liner is folded back so that a part of the liner comes into contact with the surface of the magnetic disk. Tupee disk.