JPS606939Y2 - magnetic disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk device comprising a flexible magnetic disk housed in a flat case.

This kind of device is called a floppy disk.
It is used as a storage device in various devices.

When recording or reproducing data on such a magnetic disk, dust or the like in the case enters between the magnetic head and the magnetic disk, causing a dropout phenomenon in which signals are partially lost.

Therefore, it is conceivable to provide a means for removing dust etc. on the equipment that records and plays back this magnetic disk, but in this case, an opening must be provided in the case to insert the above-mentioned removing means, or the head The removal means must be inserted through a small insertion opening, which poses a problem in that there are many restrictions.

There is also another problem in that distortion of the magnetic disk caused by relative contact movement between the magnetic head and the magnetic disk deteriorates the contact state of the magnetic head with the magnetic disk.

The present invention was devised in view of these problems, and includes housing a flexible magnetic disk in a flat case, and providing space between the top surface of the magnetic disk and the case, and between the bottom surface and the case. A magnetic disk device having a liner sheet interposed therebetween, characterized in that an elastic pressing means is provided in the case, and the liner sheet is brought into positive contact with the magnetic disk by the elastic pressing means. This relates to a disk device.

The present invention will be explained below with reference to the illustrated embodiment. As shown in FIG. It is composed of Case 4, which is connected and admonished.

The magnetic disk 1 is made of a circular flexible polymer film, and has a magnetic layer formed on at least its lower surface.

A circular opening is formed approximately in the center of the magnetic disk 1, and a dish-shaped chuck ring 5 is attached to this opening.

A pair of small holes 6 are formed in the chuck ring 5.
The magnetic disk 1 is engaged with a drive pin of a spindle to rotate the magnetic disk 1 within the case 4.

The upper and lower halves 2 and 3 constituting the case 4 are molded from synthetic resin into a substantially square shape, and ribs 7 are formed on the peripheral edges thereof.

By joining the halves 2 and 3 with the tips of these ribs 7 in contact with each other, a hard case 4 having a space in which the disk 1 is housed and rotated is formed.

An elongated hole 8 for head insertion is formed in the lower hole 73, and an opening 9 for pad insertion is formed in the upper half 2 corresponding to this elongated hole 8.

Further, a circular opening 10 for inserting a spindle is formed in the lower half 3.

Also, a liner sheet 1 is provided between the upper half 2 and the magnetic disk 1 and between the lower half 3 and the magnetic disk 1.
1.12 are interposed respectively.

These sheets 11.12 are made of non-woven fabric, for example,
This allows the disk 1 to rotate smoothly within the case 1.

Note that a circular opening 13 for inserting a spindle and a long hole 14 for inserting a head are formed in the lower liner sheet 12, respectively.

Furthermore, in this magnetic disk drive, an elastic piece 15 is arranged between the lower liner sheet 12 and the lower half 3.

This elastic piece 15 is cut out of a polymeric film such as polyester having elasticity, and is cut out from the lower part 1 as shown in FIG.
One end is inserted into the recess 16 formed on the inner surface of the -73 and fixedly supported by a method such as adhesion.

The free end of this elastic piece 15 extends obliquely upward.

Therefore, due to the elasticity of this elastic piece 15, the tip of the elastic piece 15 is
As shown in the figure, the liner sheet 12 is partially pressed onto the lower surface of the magnetic disk 1.

Therefore, this portion of the liner sheet 12 forcibly removes the dust adhering to the lower surface of the magnetic disk 1, and the magnetic disk 1 does not come into contact with the magnetic head with the dust still attached.

Therefore, a dropout phenomenon in which a signal is partially lost can be effectively prevented.

Furthermore, in this magnetic disk device, since the case 4 is provided with the elastic piece 15 for preventing dropouts, there is no need to provide a dropout removal device on the device side, and the case 4 is provided with a large opening. There's no need.

In addition to the above-mentioned effect of forcibly removing dust, it also has the effect of tensing the magnetic disk and absorbing its vibrations, which eliminates distortion of the magnetic disk and maintains stable contact between the magnetic head and the magnetic disk. Therefore, dropouts caused by vibration of the magnetic disk can be greatly improved.

The attachment of the elastic piece 15 is not limited to the structure shown in FIG. 2; for example, as shown in FIG. In addition to being bonded, the half 3 may be curved upward by a protrusion 18 formed on the half 3.

Alternatively, as shown in FIG. 5, the elastic piece 15 may be attached in a curved state to the locking portion held by the pair of protrusions 19 and 20, and the liner sheet 12 may be pressed onto the magnetic disk 1 at the central portion of the elastic piece 15. good.

Alternatively, as shown in FIG. 6, one end of the malleable spring material 21 may be fixed to the lower half 3, the spring material 21 may be bent, and the liner sheet 12 may be pressed with the bent portion. good.

As described above, in the present invention, an elastic pressing means is provided in the case, and the liner sheet is brought into positive contact with the magnetic disk by the elastic pressing means.

Therefore, according to the present invention, there is a synergy between being able to forcibly remove dust and being able to remove the distortion of the magnetic disk that tends to approach the magnetic head due to the tension of the magnetic disk. As a result, dropouts can be greatly reduced, and there is no need to provide a dropout removal device on the equipment side.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of the lower half showing the structure of the elastic piece, and FIG. 3 is an essential part of the magnetic disk device. 4 is an enlarged sectional view of a main part showing a modification, FIG. 5 is an enlarged sectional view of a main part showing another modification, and FIG. 6 is a perspective view of a main part showing yet another modification. It is. In addition, in the symbols used in the drawings, 1...magnetic disk, 2, 3...half, 4...case, 11°12...liner sheet, 15...Elastic piece, 1... Spring material.

Claims (1)

[Scope of utility model registration request] In a magnetic disk device, a flexible magnetic disk is housed in a flat case, and a liner sheet is interposed between the upper surface of the magnetic disk and the case, and between the lower surface and the case, respectively. What is claimed is: 1. A magnetic disk drive, characterized in that an elastic pressing means is provided, and the liner sheet is brought into positive contact with the magnetic disk by the elastic pressing means.