JPH0624063Y2 - Magnetic disk cartridge - Google Patents

Description

[Detailed Description of Device] a. BACKGROUND OF THE INVENTION The present invention relates to a magnetic disk cartridge, for example, 3.5.
It concerns an inch floppy disk cartridge.

B. 2. Description of the Related Art Conventionally, for example, in a 3.5-inch floppy disk cartridge, as shown in FIG. 9, a disk cleaning member 5 called a liner is provided on the inner surface of the half 3 (lower half in this case) which is the cartridge body. It is distributed. This liner 5 is generally made of a non-woven fabric (for example, a rayon braid is bonded by thermoplastic polypropylene), and its inner peripheral portion 5a and outer peripheral portion 5b are bonded to the inner surface of the half 3 by heat welding or ultrasonic welding as indicated by broken lines. Has been done. At this time, the liner 5 is joined at 5c and 5d so as to face the rectangular opening 8 for writing and reading data to and from the magnetic disk from both sides. In addition, reference numeral 13 in the drawing denotes the rotation direction of the magnetic disk (shown by a chain line 10).

However, the liner 5 used above usually has a fiber direction determined by the papermaking direction when it is manufactured by a papermaking technique, and this fiber direction is parallel to the opening 8 as shown by 18. Since it is joined to the lower half 3, it has been found that the following fatal problems occur on the upstream side when the disc rotates. That is, for the sake of easy understanding, in the drawings, the fiber direction of the runner 5 (this is usually the main direction when the main direction component of the fibers constituting the nonwoven fabric occupies 5 to 10 times the other direction component). 18 is oriented in the disk radial direction (that is, parallel to the opening 8) in the vicinity of the opening 8, and is rubbed against the disk 10 to draw out the non-woven fabric fiber as shown by 19 and cause its fraying. easy. Such fraying may extend up to several cm, and the surface of the disk 10 may be scratched or may be fused or fixed to the disk surface by friction. When the above-mentioned frayed fiber 19 is sandwiched between the magnetic head (not shown) inserted in the opening 8 and the disk 10, writing or reading error occurs or characteristic deterioration due to spacing loss occurs. . Although the lower half 3 has been described above, the same phenomenon occurs on the upper half side.

C. Object of the Invention An object of the present invention is to provide a magnetic disk cartridge in which fibers and the like are not frayed from a liner and writing and reading can be performed favorably.

D. Configuration of the Invention That is, according to the present invention, a liner that is rubbed against the magnetic disk is disposed in a cartridge body that houses a magnetic disk, and an opening for writing and reading information to and from the magnetic disk is provided in the cartridge body. In the magnetic disk cartridge described above, the fiber direction of the liner in the region facing the opening intersects the radial direction of the magnetic disk of the opening at an angle of ± 10 to ± 20 degrees. The present invention relates to a magnetic disk cartridge.

Here, the above-mentioned "fiber direction" means the main direction of the fiber constituting the liner, and generally refers to the main direction when the main direction component occupies 5 to 10 times the other direction component. Further, the above “predetermined angle” is preferably 90 degrees, but may be in the range of 90 degrees to ± 30 degrees (actually 10 to 20 degrees).

E. Embodiments Embodiments of the present invention will be described below.

1 to 5 show a 3.5-inch floppy disk cartridge 1 according to the first embodiment of the present invention.

FIG. 1 shows the inner half sides of the upper half 2 and the lower half 3 of the cartridge 1 which are separated from each other. Openings 7 and 8 are formed in each half, and the internal floppy disk 10 faces these openings 7 and 8. The openings 7 and 8 are normally shielded by a metal shutter (not shown) having a U-shaped cross section when the disk is not used, and the disk 10 (media) is closed.
Although not exposed, the shutter is moved to the open position during disk drive (during magnetic recording), and the recording surface of the disk 10 is exposed in the opened openings 7 and 8. The disk 10 is rotatably housed in the body halves 2 and 3 while being fixed to a center hub mounted on a driver side spindle.

Further, as shown in FIGS. 2 and 3, at the time of disk drive (dashed line 9 indicates a magnetic head), the liner 25, the disk 10 and the liner 24 are moved to the lifter position by the lifter 11 fixed to the lower half 3. Is pressed against the ribs 12 on the upper half 2 side, and not only the sliding contact (that is, cleaning) between the disc liners there is good, but also at other places, the liner (particularly 24) is in a relatively wide range with respect to the disc 10. It will be in sliding contact. The rib 12 is composed of a group of linear projections arranged in a row in the radial direction. Further, one end 11a of the lifter 11 is adhesively fixed to the half 3, and the other end side is bent obliquely upward to form a free end. The rotation direction of the disk 10 is the clockwise direction 13 of the lower half 3 in FIG.

The notable configuration of the cartridge according to this example is liners 24 and 25 (24a, 24b, 24c, 24d, and 25).
a, 25b, 25c, and 25d are welded portions, particularly, in the liner 25, in a region where the fiber direction indicated by 28 faces the opening 8 as clearly shown in FIG.
(Longitudinal direction) is almost orthogonal or at right angles. This also applies to the other liner 24.

By arranging the fiber directions in this way, the fibers are cut orthogonally in the region of the opening 8 during the cutting process of the liner, so that the non-woven fabric fibers are less likely to be pulled out even when the disc 10 is rubbed, and the fraying occurs. No fibers are produced. As a result, writing and reading can be performed favorably without scratches on the disc, adhesion of fibers, and the like.

The fiber direction 28 is very important and is preferably orthogonal to the disk radial direction as shown in FIG. Moreover,
In terms of cleaning the disc 10, this fiber direction is preferably oriented in a direction orthogonal to the disc rotation direction (that is, the disc radial direction) at the position of the lifter 11. At this point, since the fiber direction 28 intersects at the position of the lifter 11 at a considerably large angle, if not perpendicular to the disc rotation direction, the contact of the nonwoven liner 25 with the disc at the lifter 11 and this The disc cleaning property due to is sufficient. Now, when the angle between the opening 8 and the lifter 11 is α (usually α is 100 to 110 degrees), the fiber direction 28 of the liner 25 is not limited to the above orthogonal direction, but ±
It may be offset within θ. Θ selected here is about 30 degrees (preferably 10 to 20 degrees), and therefore, the fiber direction 2
8 to ± 20 with respect to the radial direction of the disk at the lifter 11 position
It is desirable to set the angle to -50 degrees (desirably ± 10 degrees to ± 20 degrees) from the viewpoint of improving the cleaning effect.

FIG. 6 shows another embodiment of the present invention.

In this example, in the runners 24 and 25 (particularly 25), the corner portion 3 facing the opening 8 is different from the example in FIG.
Smooth corner surfaces 34a, 35a, 36a, 37a in which 4, 35, 36, 37 are cut off in a curved (arc) shape, respectively.
Is present. In this way, since the corner portion is not curved and has a smooth curved shape, the contact with the disc becomes soft especially when the disc rotates, and the corner portion 34 in the outer peripheral region on the upstream side in the rotation direction 13 thereof,
From 35, it is difficult for the nonwoven fabric fibers to be frayed, and even if some frays occur, the distance from the corner portion 35 to the opening 8 is long, so that the fibers are less likely to enter the opening 8. As a result, in addition to the effect of the fiber direction 28, the situation in which the fibers are attached to the disk surface, scratched, or pinched on the head is further reduced, and writing and reading errors and spacing loss are eliminated.

Further, the liner 25 has welded portions 25c and 25d formed at positions retracted from both long sides of the opening 8 (that is, at positions separated from the long sides by a certain distance), and the fusion line 30
Is provided up to the outermost side (that is, the ridge line portion) of the fusion-bonded portions 25c and 25d, and the ridge line portion is welded throughout, so that the above-mentioned fiber fraying from the liner 25 is more completely prevented. be able to. In particular, since all the ridges including the corners are welded, it is possible to prevent fraying more than enough, and in addition to the corners being cut off in a curved shape, the purpose of the present invention is further secured. And can be fully realized. Such a configuration can also be adopted in the example of FIG.

Further, since the welded portions 25c and 25d are provided at the positions retracted from the opening 8, even if a part of the fray is generated, it can be completely prevented from entering the opening 8. (This also applies to the example of FIG. 4). This also facilitates the welding operation and ensures the welding.

Further, since the liner 25 has a shape separated on both sides of the opening 8 (however, as a whole, it is substantially C-shaped),
Processing (punching) is easier than in the case where all are continuous, and the production yield of the liner is also improved (this is also the case in the example of FIG. 4).

As for the other liner 24, similarly to the liner 25, the corner portion around the opening 7 is cut off in a curved shape. Therefore, the sliding friction caused by the disc is relaxed even on the upper half 24 side, and it is possible to prevent the non-woven fabric from being frayed and the above-mentioned situation accompanying it.

An example in which the corner portions 34, 35, 36, 37 of the liner 25 are linearly cut as shown by the broken line in FIG. Even in this case, the fraying of the fibers can be further reduced as compared with the case where the corner portion is angular.

7 and 8 show another example, in which the shape of the liner 25 (around the opening 8) is different from that of the example of FIG.

Although the present invention has been illustrated above, the above-mentioned example can be further modified based on the technical idea of the present invention.

For example, although the above example has been described centering on the liner 25 on the lower half side, the liner 24 on the upper half side can be similarly configured. Further, in the example of FIG. 6, it is particularly desirable to cut the outer peripheral side corner portion 35 into a curved or linear shape, but it is more preferable to perform the same on the inner peripheral side 34. However, the corner portion 3 on the downstream side in the disc rotation direction
Nos. 6 and 37 are located in the direction in which the discs approach each other, and thus the fibers are not easily frayed.
6, 37 need not necessarily be cut off as described above. The ablation pattern described above may be various curves other than the arc shape. Further, the welding pattern and welding method of the liner, the shape itself and the material thereof may be other than those described above. Further, the shape, structure, parts, etc. of the outer case (half) can be variously changed, and for example, the rib pattern, the shape of the lifter, the material, etc. can be changed. The size and type of the cartridge to which the present invention is applied are not limited to those described above.

F. As described above, in the present invention, the fiber direction of the liner facing the opening for writing and reading information intersects with the radial direction of the magnetic disk of the opening at an angle of ± 10 ° to ± 20 °. Therefore, since the cut surface of the fiber is in the direction intersecting with the same radial direction, the fiber and the like will not be frayed from the liner when rubbing against the disc, and there will be no scratches on the disc, adhesion of unnecessary substances, etc. Reading can be performed well.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is a plan view of each inner surface showing the upper and lower halves (outer casings) separately, and FIG. 1 is a sectional view taken along the line II-II of FIG. 1 when the magnetic disks are joined together to accommodate the magnetic disk, FIG. 3 is a similar sectional view taken along the line III-III of FIG. 1, and FIG. 5 and FIG. 5 are half plan views for explaining the fiber direction, and FIGS. 6, 7, and 8 are enlarged views of main parts according to other examples. FIG. 9 is an enlarged view of a main part of a lower half according to a conventional example. In the drawings, reference numerals 1 ... Magnetic disk cartridge 2 ... Upper half 3 ... Lower half 5, 24, 25 ... Liners 5a, 5b, 5c, 5d, 24a, 24b, 24c, 2
4d, 25a, 25b, 25c, 25d ... Welding portion 7, 8 ... Opening 9 ... Head 10 ... Magnetic disk 11 ... Rib 12 ... Lifter 13 ... Disk rotation direction 18, 28 ... Fiber direction 19 … Fraying of fibers.

Claims (1)

[Scope of utility model registration request] 1. A liner to be rubbed against the magnetic disk is arranged in a cartridge body containing the magnetic disk,
In a magnetic disk cartridge in which an opening for writing and reading information to and from the magnetic disk is provided in the cartridge body, a fiber direction of the liner in a region facing the opening is with respect to a radial direction of the magnetic disk of the opening. A magnetic disk cartridge characterized by intersecting at an angle of ± 10 degrees to ± 20 degrees.