JPH064464Y2 - Disc cartridge - Google Patents

Description

TECHNICAL FIELD The present invention relates to a disk cartridge in which a liner is attached to a case such as a jacket or a hard case and a disk-shaped medium such as a magnetic disk is accommodated.

Conventional technology Conventionally, a disk cartridge is a drive (magnetic recording / reproducing device), like a cassette tape or a disk pack.
It is widely used as an exchangeable information recording medium that can be attached to, removed from, and stored or moved. An 8-inch or 5-inch disk cartridge uses a thin and flexible jacket made of vinyl chloride or the like as a protective case, and a magnetic disk is rotatably accommodated therein. However, since a window for inserting a magnetic head, a window for driving a magnetic disk, etc. are left open in this jacket, a part of the magnetic disk is exposed to the outside. Therefore,
Furthermore, considering the increase in mechanical strength and the prevention of dust adhesion,
A hard case consisting of a rigid upper and lower halves that is thick and hard to deform in a 3.5-inch disk cartridge is used. A shutter is provided in the magnetic head insertion window, and a magnetic disk is provided in the magnetic disk drive window. The magnetic disk is rotatably housed in the hard case with the hub facing.

Usually, a liner that covers and protects the magnetic disk and removes dust and the like from the surface is attached to the inner walls facing each other in the case such as the jacket and the hard case. This liner is, for example, a sheet having a shape as shown in FIG. 5, and a ring-shaped surface contacting the recording surface of the magnetic disk is provided with a large number of irregularities evenly distributed over the entire surface. There is. It should be noted that each square in the figure indicates a convex portion, and the rest are concave portions.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in recent disk cartridges, since high density recording of magnetic disks has progressed, even if a small amount of dust or the like adheres to the inner peripheral side of the disk cartridge, an error easily occurs during recording and reproduction. This is because the recording density is larger on the inner peripheral side, and if dust adheres, it has a great effect. However, it is difficult to increase the cleaning effect of the conventional liner by appropriately pressing it according to the distribution of the recording density of the magnetic disk. That is, in this surface shape, the area of the convex portion is made equal on the inner peripheral side and the outer peripheral side of the magnetic disk, so the area of the convex portion is designed to be large in order to enhance the cleaning effect on the inner peripheral side of the magnetic disk. Then,
The outer peripheral side is also strongly pressed, the rotational torque of the drive increases, the rotational accuracy deteriorates, and recording and reproduction cannot be performed accurately. Conversely, if the area of the convex portion is designed to be small so as to reduce the rotating torque, the cleaning effect is reduced.

The present invention has been made in view of such conventional problems, and by improving the surface shape of the liner, it exhibits a good cleaning effect according to the distribution of the recording density of the disk-shaped medium, It is an object of the present invention to provide a disk cartridge that can perform stable recording and reproduction without increasing the rotation torque of the disk cartridge.

Means for Solving the Problems Means for achieving the above object will be described below with reference to the first, second and third figures corresponding to the embodiments.

In this disc cartridge, a disc-shaped medium 26 is rotatably housed in a case 32 in which a liner 10 having a large number of irregularities on its surface is attached to an inner wall. Then, the convex portion 18 with respect to the concave portion 20 in the liner 10
Is larger on the inner peripheral side of the disk-shaped medium 26,
Make it smaller toward the outer circumference.

Operation With the above configuration, the recess 2 in the liner 10
Since the area ratio of the convex portions 18 to 0 is large on the inner peripheral side of the disk-shaped medium 26 and becomes smaller toward the outer peripheral side, contact between the convex portions 18 and the recording surface causes the liner 10 to move to the disk-shaped medium 26. The pressing force acting on the inner peripheral side becomes larger toward the inner peripheral side, and the cleaning action becomes more remarkable toward the inner peripheral side. At that time, the dust and the like removed from the recording surface is held by the recess 20 of the liner 10. However, centrifugal force acts on the dust due to rotation, and the dust gathers on the outer peripheral portion where the area of the recess 20 is larger than the central portion. Further, since the pressing force works smaller on the outer peripheral side, the rotating torque does not increase.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a liner of a disc cartridge to which the present invention is applied, FIG. 1 (a) is a front view and FIG. 1 (b) is a sectional view taken along line AA. In the figure, 10 is a ring-shaped liner made of a sheet of non-woven fabric, 12 is a circular hole in the center, and 14 is a rectangular hole in which the ring is partially cut away. The circular hole 12 corresponds to a hub driving pin receiving portion provided in the upper half or a magnetic disk driving window opened in the lower half. The rectangular holes 14 correspond to the magnetic head insertion windows formed in the upper and lower halves, respectively. Since many irregularities are formed on the surface 16 of such a liner 10,
A large number of square convex portions 18 having various sizes are distributed and provided on the entire surface by, for example, embossing, and concave portions 20 are formed between them. At that time, in the central portion of the liner 10, the areas of the respective convex portions 18 are made to be closer to each other like the convex portions 18a and 18b, but the areas of the respective convex portions 18 are made smaller toward the outer peripheral portion and are separated from each other. To do. As a result, the area ratio of the convex portion 18 to the concave portion 20 of the liner 10 is large on the inner peripheral side of the magnetic disk and becomes smaller toward the outer peripheral side. Incidentally, on the back surface 22 of the liner 10, the area ratio of the convex portions to the concave portions has an opposite positional relationship.

A disk cartridge is constructed using such liners 10 (10a, 10b) above and below a magnetic disk 26 having a hub 24 at its center as shown in FIG.
The surfaces 16 are arranged so as to face the magnetic disk 26 and are housed in a hard case 32 composed of upper and lower halves 28 and 30. At that time, the upper and lower liners 10 have their outer peripheral back surfaces corresponding to the upper and lower halves 2 respectively.
Attach to each inner wall of 8 and 30. In addition, 34 is the upper half 2
The shutter slide area at 9 and the magnetic head insertion window at 36 are there. Further, 38 is an elastic body (called a lifter) installed in the lower half 30.

FIG. 3 is an external perspective view of the disc cartridge with the shutter attached and the assembly completed. When such a disk cartridge is not used, the shutter 40 closes the magnetic head insertion window 36 in the upper and lower halves 28 and 30,
The magnetic disk 26 is housed inside so as to be rotatable. When this disc cartridge is mounted on the drive during use, the shutter 40 opens and the magnetic head enters through the window 36 and the like, and the hub 24 receives the driving force to contact the recording surface of the rotating magnetic disc 26. At this time, the upper and lower liners 10 are always supported from behind by the inner walls of the corresponding upper and lower halves 28, 30 so that the tips of the large number of protrusions 18 provided on them are in contact with the upper and lower recording surfaces of the magnetic disk 26. .
Moreover, since the area ratio of the convex portion 18 to the concave portion 20 of the upper and lower liners 10 is large on the inner peripheral side of the magnetic disk 26 and decreases toward the outer peripheral side, the pressing force exerted on the magnetic disk 26 by each learner 10 is increased. Becomes larger toward the inner circumference side, and the cleaning action becomes more remarkable toward the inner circumference side. In this way, the dust and the like removed from the upper and lower recording surfaces of the magnetic disk 26 is removed by the upper and lower liners 10.
It is held by the concave portion 20 of. However, since centrifugal force acts on the dust due to rotation, the dust is more likely to collect on the outer peripheral portion having a larger area than the central portion, which is convenient. Further, the pressing force generally has a greater effect as the pressing force is applied to the outer peripheral side of the magnetic disk 26, and the rotating torque must be increased.
Since this pressing force works smaller toward the outer peripheral side, it is not necessary to increase the rotational torque. Rather, as compared with the conventional liner, since the number of the protrusions 18 on the inner peripheral side is increased and the number on the outer peripheral side is decreased, the rotational torque can be reduced.

FIG. 4 is a view showing another liner of the disk cartridge to which the present invention is applied, wherein (a) is a front view and (b) is a BB sectional view thereof. Liner 4 according to this embodiment
2 is the surface 4 of the liner 10 as compared with the liner 10 according to the above embodiment.
The shape, size, number, arrangement, etc. of the convex portions 46 provided on No. 4 are different, but all others are the same. That is, all of the plurality of convex portions 46 are linear and are radially distributed at equal intervals from the central portion of the liner 42 to the outer peripheral portion, and the concave portions 48 are formed between them. Moreover, in the central portion of the liner 42, for example, the convex portions 46a and 46b are made larger in area such that the convex portions 46 are closer to each other, but the area of each convex portion 46 is made smaller toward the outer peripheral portion, Separate from each other. Therefore,
Similarly, the area ratio of the convex portion 46 to the concave portion 48 of the liner 42 is large on the inner peripheral side of the magnetic disk and decreases toward the outer peripheral side.

In each of the above examples, the convex portion provided on the surface of the liner is square or linear, but the shape of such a convex portion,
The size, the number, the arrangement, etc. can be arbitrarily changed to increase the area ratio of the convex portion to the concave portion on the inner circumference side of the magnetic disk and decrease it toward the outer circumference side.

Furthermore, the present invention is not limited to a disk cartridge containing a magnetic disk, but can be applied to a disk cartridge containing another similar disk-shaped medium.

Effect of the Invention According to the present invention described above, a good cleaning effect can be obtained according to the distribution of the recording density of the disk-shaped medium, and stable recording / reproducing can be performed without increasing the rotation torque of the drive. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a liner of a disc cartridge to which the present invention is applied, FIG. 1 (a) is a front view and FIG. 1 (b) is a sectional view taken along line AA. FIG. 2 is a layout view of each main component showing an assembling process of the disc cartridge, and FIG. 3 is an external perspective view showing a completed assembly of the shutter. FIG. 4 is a view showing another liner of the disk cartridge to which the present invention is applied, wherein (a) is a front view and (b) is a BB sectional view thereof. FIG. 5 is a front view showing a liner used in a conventional disc cartridge. 10,42 …… Liner, 16,44 …… Surface, 18,
46 ... convex portion, 20, 48 ... concave portion, 22 ... back surface, 2
6 ... disc-shaped medium, 28,30 ... upper and lower halves, 3
2 ... Hard case

Claims (1)

[Scope of utility model registration request] 1. A disk cartridge in which a disk-shaped medium is rotatably housed in a case in which a liner having a large number of concavities and convexities on its surface is attached to the inner wall, and the area ratio of the convex part to the concave part of the liner is the disk-shaped ratio. A disk cartridge characterized in that it is large on the inner peripheral side of the medium and becomes smaller toward the outer peripheral side.