JPH0210630Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flexible disk device that records and reproduces information signals such as video signals by rotating a flexible disk having a signal recording surface enclosed in a case, and particularly relates to a flexible disk and a flexible disk. This is designed to improve contact with the head.

2. Description of the Related Art Generally, flexible disk devices have been proposed that are capable of recording on or reproducing data from a magnetic flexible disk enclosed within a case. This flexible disk device is easy to operate because it can record and reproduce signals by attaching the magnetic flexible disk, which is a recording medium, to a recording/reproducing device while being enclosed in a case, and is very convenient to handle and store.

By the way, this flexible disk device is the first
It is attached to a recording/reproducing device as shown in the figure. That is, in the flexible disk device 1, a magnetic flexible disk 2, which is a magnetic recording medium made of a thin flexible synthetic resin or the like as a base material, has an opening 3 in the center and a head insertion hole 4 in the axial direction. Since the flexible disk device 1 is loosely fitted into the bag portion 6 of the case 5 which has a The flexible disk 2 is fitted onto a boss 9 pivotally attached to the tip of the disk 8, and the flexible disk 2, which is disposed so as to look into the opening 3, is held between the upper end surface 10 of the boss 9 and the upper pressing member 11. do. In this state, the magnetic head 12, which is movable in the direction of arrow A shown in FIG. 1, is inserted into the flexible disk 2 from the head insertion hole 4.
The flexible disk 2 is brought into contact with the disk and rotated at high speed to perform recording or reproduction.

In this flexible disk device 1, a magnetic head 12 is arranged in the radial direction of the flexible disk 2.
The flexible disk 2 is flexible and is held only at its center, so recording or reproduction is performed over a diameter of, for example, 1 cm to 20 cm from the center ring hole 2a. Near the outer periphery of the flexible disk 2, the flexible disk 2 is pushed up by the magnetic head 12 and rotates to escape upwards, ensuring that the recording surface of the flexible disk 2 and the magnetic head 12 are in good contact. There was an inconvenience that the contact was no longer made and video signals etc. could not be recorded or reproduced satisfactorily.

In view of this, the present invention is a flexible disk 2.
The recording surface of the magnetic head 12 is always in good contact with the magnetic head 12.

Hereinafter, one embodiment of the flexible disk device of the present invention will be described with reference to FIGS. 2, 3, and 4. In FIGS. 2, 3, and 4, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, the upper case 5a and lower case 5b of the case 5 of the flexible disk device 1 are made of glass beads with a particle size of 30 μm or less, 30 to 50 volume%, resin, 30 to 40 volume%, and graphite, approximately 10 volume%. This lower case 5 is made of polymer composite material.
A head insertion hole 4 is formed in b, and the upper case 5 is
A is inserted into the head insertion hole 4 at a position corresponding to the side opposite to the entry side of the flexible disk 2 into the head insertion hole 4 (in FIG. 2, arrow B indicates the rotational direction of the flexible disk 2) on the inner wall of a. A sliding guide 13 having a semi-cylindrical protrusion, that is, a bulging surface, is provided along the guide. In this case, the sliding guide 13 extends from the opening 3 of the case 5 to the outer periphery of the case. Moreover, in this case, glass beads 13 are formed on the inner walls of the upper case 5a and the lower case 5b.
a should protrude from other compositional matrices by about 0.1 μm to 10 μm, and the width of the sliding guide 13 should be 1 to 1 μm.
3 mm, and the height is preferably about 0.5 to 2 mm.
The rest of the structure is the same as that of the conventional example shown in FIG.

Since this example is constructed as described above, the flexible disk device 1 can be mounted on a recording/reproducing apparatus in the same way as in FIG. In this case, when rotating the flexible disk 2 for recording or reproducing, as shown in FIG.
The flexible disk 2 is pushed down by the sliding guide 13 and pressed against the magnetic head 12 side, so that the flexible disk 2 and the magnetic head 12
The contact between the flexible disk 2 and the sliding guide 13 is always good, and the contact between the flexible disk 2 and the sliding guide 13 is
Since the point contact with the glass beads 13a of 30 μm or less occurs and the frictional force is extremely small, the rotation of the flexible disk 2 is not hindered and good recording and reproduction can be achieved. Furthermore, since the flexible disk 2 is flexible even when the flexible disk 2 is started, it is in contact with the inner wall of the lower case 5b when the flexible disk 2 is stopped.
Glass beads 1 with a particle size of 30 μm or less are placed on the inner wall of b.
3a protrudes, the contact between the flexible disk 2 and the inner wall of the lower case 5b is a point contact, resulting in good rising characteristics without sticking due to dew condensation or the like. Furthermore, the flexible disk 2 only contacts the glass beads 13a, which is a point contact and has low friction, which has the advantage of a longer life compared to a surface contact, and the glass beads do not deteriorate over time.

In addition, in the above example, since graphite is mixed into the polymer composite material, this graphite has a relatively low electrical resistance value, and even if the flexible disk 2 is charged by frictional electricity, this charge cannot be absorbed by this graphite. There is no inconvenience that the flexible disk 2 is charged due to discharge through the flexible disk.

As described above, according to the present invention, the contact between the flexible disk 2 and the head 12 can be improved, and good recording and reproduction can be achieved.

6 and 7 show other embodiments of the present invention. 6 and 7, the head insertion holes are located at positions corresponding to the front and rear of the head insertion holes 4 of the flexible disk 2 in the inner wall of the upper case 5a of the flexible disk device 1 in the direction of rotation B. Sliding guides 13b and 13 protruding in a semi-cylindrical shape are provided along 4. The rest of the configuration is the same as the examples in FIGS. 2, 3, and 4.

6 and 7, the sliding guides 13b and 13 operate to push down the flexible disk 2, as shown in FIG. 8, to move the flexible disk 2 toward the head side. Press. Therefore, it is easy to understand that the same effects as in the above example can be obtained in FIGS. 6 and 7 as well.

In the above embodiment, the sliding guides 13 and 1
3b has a semi-cylindrical shape, but it goes without saying that this shape may also be a sloped table shape or other shape for pressing the flexible disk 2 toward the head side. Further, the composition of the polymer composite material is not limited to the above-mentioned composition, but it goes without saying that other compositions may be used as long as the main component is glass beads. Further, in the above embodiment, the entire upper and lower cases 5a and 5b were made of a polymeric composite material mainly composed of glass beads, but only the sliding guides 13 and 13b were made of a polymeric composite material mainly composed of glass beads. It is easy to understand that the effects of the present invention can be obtained even if the device is constructed from a molecular composite material. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations can be adopted without departing from the gist of the present invention.

[Brief explanation of the drawing]

Figure 1 is a schematic sectional view showing an example of a conventional flexible disk device installed in a recording/reproducing device;
The figure is a plan view showing one embodiment of the flexible disk device of the present invention, FIG. 3 is a cross-sectional view taken along the line - - of FIG. 2, FIG. 4 is a cross-sectional view taken along the line - - of FIG. 2, and FIG. 6 is a plan view showing another embodiment of the present invention, and FIG. 7 is a schematic sectional view for explaining the present invention.
FIG. 8 is a schematic cross-sectional view for explaining the example shown in FIG. 6. 1 is a flexible disk device, 2 is a flexible disk, 3 is an opening, 4 is a head insertion hole, 5
1 is a case, 5a and 5b are an upper case and a lower case, respectively, 12 is a magnetic head, 13 and 13b are sliding guides, and 13a is a glass bead.

Claims (1)

[Scope of utility model registration request] A flexible disk having a signal recording surface is enclosed in a case, an opening is provided in the center of the case into which a rotating shaft is inserted, and a head insertion hole is provided extending in the diametrical direction of the flexible disk. , by a polymer composite material containing 30 to 50% by volume of glass beads having a diameter of 30 μm or less along the longitudinal direction of the head insertion hole on the inner wall opposite to the head insertion hole of the case. A sliding guide with a bulging surface that presses the flexible disk toward the head is installed,
Some of the glass beads are removed from the sliding guide surface.
A flexible disk device that protrudes by 0.1 to 10 μm and makes point contact with the flexible disk.