JPS606936Y2 - Flexible disc storage case - Google Patents

Description

[Detailed description of the invention] The present invention relates to a case for storing flexible discs, and has been devised to enable playback without taking the disc out of the case, and to minimize the vibration amplitude of the disc during playback. This invention relates to a flexible disk storage case.

There are various types of so-called high-density information recording disks, such as video disks, PCM or FM modulation audio disks, and magnetic disks called floppy disks, depending on the playback method, but all of them have different recording surfaces. If dust, fingerprints, etc. adhere to the disc, a significant disturbance in the signal amount called one-drop out occurs during playback, which is a serious problem.

In order to prevent such disturbances, disc storage cases and corresponding playback devices have been developed, but none of these are perfect. For example, a disc is stored in a case, and the entire case is inserted into the playback device during playback. In this case, the disc is mechanically removed from the case inside the playback device, so there is a risk of damaging the disc when removing it, and there is also a risk of damaging the disc while it is still sealed inside the case. A case commonly referred to as a floppy disk jacket has been developed in which the disk can be rotated for playback, but there is still the risk of bending the case or getting fingerprints on it.

On the other hand, among high-density information recording disks, flexible disks, which are particularly effective for magnetic reproduction or mechanical reproduction, have recently come into widespread use, but the thickness of the disk itself is 0.08 mm to 0.00 mm. Since it is extremely thin at 15 mm, it is accompanied by considerable vertical vibration when the disk rotates, and this vibration amplitude has an unfavorable effect on the reproduced signal, which is considered to be one of the major drawbacks of flexible disks.

In view of the above-mentioned prior art, the present invention aims to provide a case with a shape that allows more stable rotation of the disk without vibration amplitude when a flexible disk is housed in the case. That is.

It goes without saying that this flexible disk is rotated within the case during playback.

Next, an outline of the present invention will be explained.

The case according to the present invention is composed of upper and lower plates, side plates, etc., and a playback window is formed on the top or bottom plate, and a rotation hole for disk rotation is provided in the center of the top and bottom plates, so that it can be used during playback. This is a flexible disc storage case that allows the disc to rotate within the case, with chevron-shaped curved parts on the inner surfaces of the upper and lower plates facing the playback window, and air vent holes on the side plates to allow the rotation of the flexible disc. This makes it more stable.

Next, the present invention will be explained in detail based on the embodiments shown in the drawings.

FIG. 1 is an explanatory view of the flexible disk storage case of the present invention, in which the upper plate 1, side plates 3, and lower plate 2 are shown separated for easy understanding.

In reality, the three are integrated to form the disc storage space 4.

The upper and lower plates 1 and 2 have substantially the same shape, and rotation holes 5 and 6 are formed in the center thereof.

Furthermore, the upper and lower plates 1 and 2 have playback windows 13 and 14 for inserting playback members for playing back signals recorded on the disk 20.
is formed.

Incidentally, the playback windows 13 and 14 are set at 180° from each other.

Although not shown, it is preferable to attach a lid to the playback window 13, 14 using a hinge or the like so that it is opened within the playback device only during playback.

The inner surfaces of the upper and lower plates 1 and 2 are also provided with a chevron-shaped curved portion 15.1.
6 is provided.

The curved portions 15 and 16 are located at positions opposite to the aforementioned reproduction windows 13 and 14, that is, the curved portions 16 are located at positions opposite to the reproduction windows 13, and the curved portions 15 are fan-shaped at positions opposite to the reproduction windows 14. from the periphery of the rotation hole to the side plate.

Furthermore, the shape of the curved portions 15 and 16 has an apex on the radius through which the reproducing member 30 for reproducing the stored flexible disk 20 passes, as shown in an enlarged view in FIG. 2, and the disk rotates around this apex as a boundary. When doing so, the slope on the side you ride on is gentle, and the side beyond the apex is sloped slightly steeply.

The side plate 3 is shaped so that an air vent hole 17 is formed when the upper and lower plates 1 and 2 are stacked to form a case.

As in the embodiment shown in the drawings, convex portions may be provided on both sides of the side plate at equal intervals, and the air vent holes 17 may be formed by utilizing the gaps when they are overlapped.

When playing a disc using the flexible disc storage case configured as described above, as shown in FIG.
It can be clamped and rotated.

The following describes the behavior when the flexible disk housed in this case is rotated and played back according to such a playback method.

FIG. 4 shows the vibration amplitude of a rotating flexible disk measured linearly from the center in the radial direction, and A to E shown in the figure are values for each of the following cases.

That is, A is the value when only the disk is clamped and rotated without using a case, and it can be seen that there is a considerable vibration amplitude over the entire circumference, and it is particularly large at the outer circumference.

B-E are all cases in which the disc rotates within the case for playback, B has no curved part and has an air vent hole in the side plate, and C has a curved part and has an air vent hole in the side plate. D indicates the value of the vibration amplitude when neither the curved part nor the air vent hole on the side plate is provided, and E indicates the value when both the curved part and the air vent hole on the side plate are provided, that is, when the case according to the present invention is used. It is.

In addition, in the case where a curved part is installed, it goes without saying that the measurement is performed on the apex of the curved part.

As is clear from Figure 4, in order to reduce the vibration amplitude when the disk rotates, it is essential to rotate the disk within the case, and in addition, the curved parts and air vent holes installed on the inner surfaces of the upper and lower plates reduce the vibration amplitude. It is understood that this will have a significant impact on

That is, when curved portions are provided on the inner surfaces of the upper and lower plates and air vent holes are provided on the side plates as in the present invention, the vibration amplitude of the disk becomes the smallest at the apex of the curved portion.

As detailed above, according to the present invention, it is possible to extremely reduce the vibration amplitude at the part where the playback member contacts the flexible disk during playback, so that a good playback signal can be stably produced. Now you can get it.

Furthermore, since the upper and lower plates have the same and symmetrical shape, double-sided reproduction is possible without any adverse effect on the above-mentioned good reproduction signal.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the present invention, Fig. 2 is an enlarged view of the main part when cut along the line I-I in Fig. 1, Fig. 3 is an explanatory diagram when reproducing the present invention, and Fig. 4 is an explanatory diagram of the present invention. It is a graph which shows the result of measuring the vibration amplitude of a disk. 1... Upper plate,... Rotating hole, 1... Curved part, 2 Material.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Consisting of upper and lower plates, side plates, etc., with a playback window formed on the top or bottom plate, and a rotation hole for disk rotation in the center of the top and bottom plates. A flexible disc storage case that allows the disc to rotate within the case, characterized in that a chevron-shaped curved portion is provided on the inner surface of the upper and lower plates at a position facing the playback window, and an air vent is provided in the side plate. A flexible disk storage case. 2 The peak of the mountain-shaped curved portion is on the radius along which the playback member for playing the stored flexible disk passes, and the slope on the side on which the disk rides is gentle, and the slope on the side beyond the top is steep. A flexible disk storage case according to claim 1 of the utility model registration claim.