JPH0124796Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a floppy disk that can be used in information terminal equipment.

Conventional configurations and their problems Recently, floppy disks have become smaller and easier to handle, so smaller floppy disks with hard cases have appeared on the market.

Hereinafter, a conventional floppy disk will be explained with reference to the drawings. FIG. 1 is a perspective view of a floppy disk, in which 1 is a case, 2 is a center oar provided on the case 1, 3 is a head window, and 4 is an index window.
5 is a magnetic disk housed in a case.
Reference numeral 6 denotes a hub attached to the center of the magnetic disk 5, which is rotatably assembled with the center oar 2. Reference numeral 7 is a shutter plate that keeps the head window 3 and index window 4 closed at all times so that the magnetic disk 5 cannot be touched directly.

FIG. 2 is an internal sectional view of the floppy disk. Cases 1a and 1b are provided with liner sheets 8a and 8b for removing dust and magnetic powder that are in constant contact with the magnetic disk 5 and adhere to and generated on the surface of the magnetic disk. is installed. When a floppy disk is inserted into the drive, the shutter plate 7 automatically rotates or moves to open the head window 3 and index window 4.

In Fig. 2, when the liner sheets 8a and 8b are fixed to the cases 1a and 1b by thermocompression bonding, extreme thermal deformation (protrusion) occurs on the inner surface of the case as shown in the enlarged view of the main part in Fig. 3. occurs and flatness is impaired. As a result, strong stress is applied to the cases 1a and 1b from the outside, causing deformation and causing the magnetic disk 5 to
When the liner sheets 8a, 8
There was a problem in that the protrusions inside the case mentioned above exerted local stress on the magnetic disk through the magnetic disk, causing scratches and deformation. To further explain this using FIG. 3, cases 1a and 1b are
It is made of ABS resin, and the distance between the opposing surfaces of cases 1a and 1b is approximately 1 mm. Liner sheets 8a, 8b
is made of rayon and polyester non-woven fabric, each approximately 300 μm thick. In other words, the space inside the case is approximately 300 μm. The liner sheet is fixed to the case by applying partial pressure with a hot iron. At this time, the case and liner sheet are thermally deformed and both are fixed. As a result, as shown in FIG. 3, local protrusions (100 to 300 .mu.m) are formed due to thermal deformation on the case, which initially had flatness. In this case, if strong stress is applied to the case from the outside, the case deforms as if pinching the magnetic disk, and the aforementioned extreme protrusions press strongly against the magnetic disk through the liner sheet, causing permanent scratches or deformation. This will give rise to

Purpose of the invention The purpose of the invention is to provide a floppy disk case and liner sheet mounting configuration that can provide stable quality against rough handling.

Structure of the Invention The floppy disk of the present invention has a structure in which, when a liner sheet is thermocompression bonded to the inner surface of a case made of a resin material, the part to be thermocompression bonded is processed in advance to be one step lower than the inner surface of the case. As a result, even if stress is applied from the outside in the direction of the case thickness and the magnetic disk is strongly sandwiched between the case through the liner sheet, the magnetic disk will remain magnetic due to the local protrusions on the inner surface of the case that were created when the liner sheet was thermocompressed. It is possible to prevent scratches and deformation from occurring on the disk surface that would impede the writing and reading of information.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a sectional view of a main part of a floppy disk according to an embodiment of the present invention. In FIG. 4, 15 is a magnetic disk, and case 11
A, 11b are pre-formed with recesses at the portions to which the liner sheets 18a, 18b are bonded by thermocompression so as to be one step lower than the inner surface.

As described above, according to this embodiment, by forming a recess in the thermocompression bonded part of the liner sheet of the case to make it lower, even if the case is strongly deformed by external stress, there will be no scratches or damage on the magnetic disk. Deformation can be prevented from occurring.

To describe the configuration in detail, the magnetic disk 15
1-3 μm thick magnetic layers are formed on both sides of a 75 μm thick polyethylene terectalate film. The cases 11a and 11b are made of ABS resin, and the distance between the opposing surfaces of the cases 11a and 11b is about 1 mm. The liner sheets 18a and 18b are made of rayon and polyester nonwoven fabric,
Each has a thickness of approximately 300 μm. In other words, the space inside the case is approximately 300 μm. The liner sheet is fixed to the case by applying partial pressure with a hot iron. At this time, the cases 11a, 11b and the liner sheets 18a, 18b are thermally deformed and both are fixed.

In the above structure, the liner sheet thermocompression bonded portions 12a and 12b of the case are processed to be one step lower in advance to account for the deformation that occurs during thermocompression bonding. As a result, the apparent flatness of the case is maintained even after thermocompression bonding of the liner sheets 18a, 18b, so even if the cases 11a, 11b are deformed due to external stress and the magnetic disk 15 is sandwiched between the cases 11a, 11b, The force is dispersed due to the flatness of the magnetic disk 11b, thereby preventing scratches and deformation on the magnetic disk 15.

Effects of the invention By processing the part of the case where the liner sheet is fixed to a lower level, the apparent flatness of the case is maintained even after the liner sheet is fixed, and even if the case is deformed due to external stress, the surface of the magnetic disk remains flat. No scratches or deformation will occur.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a sectional view of a floppy disk, FIG. 3 is a sectional view of a main part of a conventional floppy disk, and FIG. 4 is a sectional view of a main part of a floppy disk according to an embodiment of the present invention. It is a diagram. 11a, 11b...case, 12a, 12b...
... Fixed part, 15 ... Magnetic disk, 18a, 18
b...Liner sheet.

Claims (1)

[Scope of utility model registration request] A magnetic disk is rotatably stored inside the case.
A floppy disk comprising a liner sheet attached to the inner surface of the case, wherein a portion of the case where the liner sheet is fixed is recessed from the plane of the case.