JPH0521726Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a floppy disk cassette equipped with a lifter for pressing a liner sheet for cleaning the recording surface of the floppy disk onto the floppy disk.

[Background technology and its problems]

The floppy disk cassette is designed to prevent drop-out phenomenon in which the recording signal cannot be partially recorded or reproduced due to dust getting between the stored floppy disk and the magnetic head of the recording/reproducing device, or due to the floppy disk being charged. A liner sheet made of nonwoven fabric or the like is provided to clean the floppy disk.

In order to ensure the cleaning effect of this liner sheet, a lifter is provided to press the liner sheet against the floppy disk.

Fig. 1 is an exploded perspective view of a conventional floppy disk cassette, in which 1 is a floppy disk (hereinafter simply referred to as a disk) in which a magnetic layer is formed on the lower surface of a thin disc of polymer film, and 2 is a floppy disk. A center plate 4 is attached to the center of the disk 1 with double-sided adhesive tape 3, and 4 is an upper liner sheet disposed above the disk 1, in which a long hole 5 is provided.

Reference numeral 6 denotes a lower liner sheet disposed below the disk 1, in which an elongated hole 7 is provided at a position facing the elongated hole 5.

Reference numeral 8 denotes an upper half, which has an elongated hole 9 at a position facing the elongated holes 5 and 7, and a recess 10 on the outer surface including the elongated hole 9.
However, a protrusion 11 (see FIGS. 2a and 2b) is provided at a predetermined position on the inner surface.

12 is a lower half, with an opening 13 in the center, an elongated hole 14 at a position facing the elongated holes 5, 7, and 9, a recess 15 at a position opposite to the recess 10 on the outer surface including the elongated hole 14, and an inner surface. A protrusion 16 is provided at a predetermined position corresponding to the protrusion 11 .

17 is a lifter made of synthetic resin, and the mounting part 17
A, a supporting part 17B, and a pressing part 17C.
The attachment part 17A is attached to the lower half 12,
The pressing portion 17C is supported by the support portion 17B so as to be twisted in the radial direction of the disk 1.

A shutter 18 is slidably attached to the recesses 10 and 15 of the cassette case consisting of the upper and lower halves 8 and 12, and overlaps with the elongated holes 5, 7, 9, and 14 when slid to a predetermined position. Long hole 19,2
0 is set.

When the floppy disk cassette with the above configuration is assembled and the lifter 17 is shown, the cross-sectional view in the circumferential direction of the disk 1 is shown in FIG. 2a, and the cross-sectional view in the radial direction of the disk 1 is shown in FIG. 2b. .

As can be seen from these figures, the pressing portion 17C of the lifter 17 presses the lower liner sheet 6 against the disk 1 due to its elasticity, and the disk 1 is in a state of being cleaned.

Therefore, the dropout phenomenon can be prevented from occurring.

In addition, there are protrusions 11 and 1 on the upper and lower halves 8 and 12.
6 is provided to ensure that the lower liner sheet 6 is pressed against the disk 1 and to ensure that the lifter 17
This is to prevent the material from coming into close contact with the lower half 12.

In addition, if the upper and lower halves 8, 12, especially the lower half 12, are deformed, or in order to secure clearance for the portion of the upper and lower halves 8, 12 that accommodates the disk 1, the lower half 12 may be made into a spherical shape. Even when the lifter 17 is made to protrude outward in a
The supporting portion 17B of the pressing portion 17C is twisted in the radial direction of the disk 1, and can press the lower liner sheet 6 against the disk 1 as shown in the cross-sectional views of FIGS. 3a and 3b.

However, since the lifter 17 is made of synthetic resin, such as polyester, its elastic force decreases due to temperature changes and changes over time, making it difficult to maintain the distance between the pressing part 17C and the lower half 12. A problem arises in that the cleaning effect of the side liner sheet 6 is reduced.

In addition, since the pressing portion 17C of the lifter 17 needs to press the lower liner sheet 6 uniformly against the inner and outer peripheries of the disk 1, it is constituted by a plane substantially parallel to the inner surface of the lower half 12. Lifter 17 tends to stick to the inner surface of lifter 12.
If it is made of synthetic resin, the lifter 17 itself becomes electrically charged, and this static electricity causes the lifter 17 to stick to the lower half even if the lower half 12 is provided with a protrusion 16 to prevent sticking. It was becoming.

Furthermore, when the lifter 17 sticks to the lower half due to static electricity charged on the lifter 17, the force that urges the lower liner sheet upward is lost, and this liner sheet also moves away from the disk, reducing the cleaning effect.

[Purpose of invention]

This invention was devised in view of the above-mentioned problems, and is intended to provide a floppy disk cassette in which the cleaning effect of the liner sheet is less likely to fluctuate due to temperature changes and changes over time.

[Summary of the idea]

In order to achieve the above-mentioned purpose, this invention consists of a lifter made of a metal plate, which reduces fluctuations in the cleaning effect of the liner sheet due to temperature changes and changes over time, and prevents the lifter from being charged with electricity. This prevents the cleaning effect from being reduced due to the lifter sticking to the lower half.

〔Example〕

Figures 4a, b, and c are perspective views showing an example of a lifter used in an embodiment of this invention, in which 21 is a lifter, including a mounting part 21A, a supporting part 21B, and a pressing part 2.
It is made of 1C and is composed of metal plates such as phosphor bronze and nickel silver.

The lifter 21 of FIGS. 4a to 4c is similar to the conventional lifter 17, and as the supporting part 21B twists, the pressing part 21C twists in the radial direction of the disk.

Also, the position of the support part 21B is changed from FIG.
If it is provided in the position shown in Figure 4b, for example, the pressing force against the inner peripheral part of the disk can be increased, and similarly, if it is provided in the position shown in Figure 4c, the pressing force against the outer peripheral part of the disc can be increased.

Furthermore, the pressing force can be changed by changing the width W of the support portion 21B.

Therefore, by changing the position and width W of the support portion 21B, the distribution and size of the pressing force to the inner and outer peripheral portions of the disk can be arbitrarily selected.

In particular, in the present invention, since the lifter 21 is made of a metal plate, it is possible to reduce fluctuations in the pressing force of the lifter 21 due to temperature changes and changes over time, thereby reducing fluctuations in the cleaning effect.

In addition, the lifter 21 has a relatively stable pressing force.
Therefore, the load torque on the disk can be increased, and when both sides of the disk are used as recording surfaces, the center plate can be easily caught.

Furthermore, of the protrusions 11 and 16 provided in conventional cassette cases, it is no longer necessary to provide at least the protrusion 16.

Furthermore, since the lifter is made of a metal plate, it can have the effect of removing electrical charge from the lower liner sheet.

In other words, the static electricity generated when the lower liner sheet pressed by the lifter contacts the rotating floppy disk and performs cleaning is discharged and destroys the data on the floppy disk. However, if the lifter is made of a metal plate, this static electricity can be guided to the lifter side to prevent discharge.

Furthermore, if the lifter is made of synthetic resin, the charged lifter may stick to the lower half and reduce the effectiveness of the lifter, but this problem can also be solved.

The static electricity charged on the lower liner sheet attracts surrounding dust, which may adhere to the surface of the floppy disk and cause dropouts, but this problem can also be reduced.

FIG. 5 is a perspective view showing another example of a lifter used in an embodiment of this invention, and 22 is a lifter;
It consists of a mounting part 22A, supporting parts 22B ₁ and 22B ₂ , and a pressing part 22C, and is made of a metal plate such as phosphor bronze or nickel silver.

The lifter 22 in FIG. 5 is the lifter 21 in FIG.
Similarly, by twisting the supporting parts 22B ₁ and 22B ₂ , the pressing part 22C is twisted in the radial direction of the disk.

Further, by changing the widths W ₁ and W ₂ of the support portions 22B ₁ and 22B ₂ , the distribution and magnitude of the pressing force to the inner and outer peripheral portions of the disk can be arbitrarily selected.

Therefore, the same effect as the lifter 21 shown in FIG. 4 can be obtained.

[Effect of idea]

As explained in detail above, in the floppy disk cassette of this invention, the lifter is constructed of a metal plate, so the pressure force of the liner sheet against the disk of the lifter can be reduced from fluctuations due to temperature changes and changes over time, and the cleaning effect can be improved. It has the advantage of reducing fluctuations, and at the same time allows the static electricity charged on the lower liner sheet to escape.
This has the effect of reducing data destruction due to electrical discharge and dropouts caused by collected dust.

Furthermore, since the lifter itself can be prevented from being electrostatically charged, it is possible to prevent the lifter from sticking to the inner surface of the lower half, thereby preventing a reduction in the cleaning effect.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional floppy disk cassette, Figures 2 and 3 are cross-sectional views of the lifter part, each figure a shows the circumferential direction of the floppy disk, each figure b shows the floppy disk. In the radial direction, FIGS. 4a, b, and c are perspective views showing an example of a lifter used in an embodiment of this invention, and FIG. 5 is a perspective view showing another example of a lifter used in an embodiment of this invention. It is a diagram. In the figure, 1 is a floppy disk, 6 is a lower liner sheet, 8 is an upper half, 12 is a lower half, 21 is a lifter, 22A is a mounting part, 22B is a support part, and 22C is a pressing part.

Claims (1)

[Claims for Utility Model Registration] A cassette for storing a floppy disk which is constituted by a pair of upper and lower halves and is rotatably arranged in the space between the upper and lower halves, and a cassette which is arranged between the upper half and the magnetic disk. a lower liner sheet disposed between the lower half and the magnetic disk; and one end fixed to the inner surface of the lower half and the other end having a flat surface substantially parallel to the inner surface of the lower half. and a lifter consisting of a floppy disk, and the floppy disk is cleaned by pressing the lower liner sheet against the floppy disk such that the other end of the lifter is at a predetermined distance from the inner surface of the lower half. In the floppy disk, the lifter is made of a metal plate to prevent the lifter from being charged and to maintain a predetermined distance between the other end of the lifter and the inner surface of the lower half. A floppy disk cassette featuring.