JP2000235777A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sufficient cleaning effect on both of the inner peripheral part side and outer peripheral part side of a disk by setting the height of a rib for pressing a cleaning sheet to the disk lower on the outer peripheral part side than on the inner peripheral part side. SOLUTION: The rib 11 is so formed that the height in its inner peripheral part side, defined as h1, and the height on its outer peripheral part side, fined as h2, attain h1>h2, i.e., the inner peripheral part side is higher. The inner peripheral part side of the cartridge case is liable to bulge but the cleaning sheet is surely brought into contact with the disk and eventually the cleaning effect may be enhanced by making the height on the inner peripheral part side of the rib 11 higher than the height on the outer peripheral part side. In addition, a linear speed is higher in the outer peripheral part than in the inner peripheral part but the height of the rib 11 is so set as to be higher on the inner peripheral part side and, therefore, the air resistance of the rib 11 is made nearly equal on the inner peripheral part side and the outer peripheral part side and the rotation of the disk is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk (optical disk, optical-magnetic disk, magnetic disk) in a synthetic resin cartridge case comprising an upper case and a lower case.
More particularly, the present invention relates to a rib formed on the inner surface of a cartridge case for pressing a cleaning sheet provided on the inner surface of a cartridge case against a disk.

[0002]

2. Description of the Related Art FIG. 14 is an exploded perspective view of a general magnetic disk cartridge. The magnetic disk cartridge mainly includes a cartridge case 1, a magnetic disk 2 rotatably housed therein, and a shutter 3 slidably supported by the cartridge case 1.

[0003] The cartridge case 1 is composed of an upper case 1a and a lower case 1b, which are injection-molded with a hard synthetic resin such as an ABS resin.

An opening 4 for inserting a rotary drive shaft is formed substantially at the center of the lower case 1b, a rectangular head insertion opening 5 is provided near the opening 4, and a head insertion opening 5 is similarly provided in the upper case 1a. Have been. As shown in FIG. 14, slightly lower concave portions 6 are formed in the vicinity of the front surfaces of the upper case 1a and the lower case 1b so as to regulate the sliding range of the shutter 3. A head insertion opening 5 is provided.

FIG. 15 is a bottom view of an upper case used for the magnetic disk cartridge. A large number of linearly extending projections 7 are provided on the upper case 1a on the upstream side of the magnetic head insertion opening 5 in the disk rotation direction. An arc-shaped restricting rib 8 for restricting the storage position of the magnetic disk 2 protrudes from the inner surface of the upper case 1a.

Incidentally, with respect to a flexible magnetic disk, dust adhering to the surface of the magnetic disk enters the gap of the magnetic head and causes a reduction in recording / reproducing characteristics. It must be cleaned cleanly and troubles caused by adhesion of dust etc. must be solved.

Even for a high-density type flexible disk drive having a partially floating head, the flying height (gap between the head and the magnetic disk during rotation) is about several tens of nm, so that the magnetic disk also rotates. When cleaning, it is necessary to clean the surface and eliminate the trouble caused by the adhesion of dust and the like.

Therefore, as shown in FIGS. 5 and 6 described below,
A cleaning sheet is provided on the inner surface of the cartridge case 1. In order to ensure that the cleaning sheet is brought into contact with the magnetic disk 2 and to effectively clean the magnetic disk 2 with the cleaning sheet, the inner surface of the upper case 1a is moved from the inner peripheral side of the magnetic disk 2 to the outer peripheral side. The extending rib 11 is formed (the rib 11 is also formed on the lower case 1b).

A plurality (three in this example) of ribs 11 are provided at appropriate intervals in the rotation direction of the magnetic disk 2. Incidentally, the rib 11 has the same width w1 on the inner peripheral side and the width w2 on the outer peripheral side (w1 = w2). Also, as shown in FIG. 16, the inner peripheral side h1 and the outer peripheral side h2 are formed to have the same height (h1 = h2).

[0010]

The upper and lower cases of the disk cartridge are fastened by ultrasonic welding or screws to the outer case, while the inner case is free. Further, when the upper case and the lower case are molded with a resin, the inner peripheral portion is thinned, and the mechanical strength is likely to be weakened. When the mechanical strength is weak, the inner peripheral portion is likely to swell.

As described above, since the conventional rib has the same height on the inner peripheral side and the outer peripheral side, when the inner peripheral part of the cartridge case expands, the cleaning on the inner peripheral side of the disk is performed. There is a problem that the effect tends to be uncertain.

The present invention has been made based on such a background, and an object of the present invention is to provide a disk cartridge capable of obtaining a sufficient cleaning effect on the inner peripheral side of a disk.

[0013]

In order to achieve the above-mentioned object, a first means comprises a cartridge case, a disk rotatably housed in the cartridge case, and an inner surface of the cartridge case. A disk cartridge comprising a cleaning sheet and a rib formed on the inner surface of the cartridge case and extending from the inner peripheral side to the outer peripheral side of the disk, wherein the height of the rib is higher on the outer peripheral side than on the inner peripheral side of the disk. It is characterized in that it is lower.

The second means is the first means,
The disk is a flexible magnetic disk.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals.

FIG. 1 is a front view showing ribs of a disk cartridge according to an embodiment of the present invention, and FIG. 2 is a front view showing a modification thereof. In the rib 11 of the present invention, when the height on the inner peripheral side is h1 and the height on the outer peripheral side is h2, h1> h
2, that is, the inner peripheral side is higher. As described above, the inner peripheral side of the cartridge case 1 easily swells, but since the inner peripheral side of the rib 11 is higher, the cleaning sheet surely comes into contact with the disk even on the inner peripheral side of the disk. The cleaning effect can be enhanced.

The linear velocity of the outer peripheral portion of the disk is higher than that of the inner peripheral portion, but the height of the ribs 11 is set to be higher on the inner peripheral side. Are substantially equal on the inner peripheral side and the outer peripheral side, and there is also an effect that the rotation of the disk is stabilized. In the modification shown in FIG. 2, an appropriate number of grooves 11-
1 is formed. Due to the presence of the groove 11-1, it is possible to prevent the flow of air generated with the rotation of the disk from being interrupted. In other words, air can be released by the groove 11-1. In this way, the stability at the time of high-speed rotation of the disk can be further maintained.

FIG. 3 is a bottom view of the upper case before fixing the cleaning sheet in the disk cartridge according to the first embodiment of the present invention, FIG. 4 is a bottom view of the lower case before fixing the cleaning sheet, and FIG. FIG. 6 is a bottom view of the lower case after fixing the cleaning sheet, and FIG. 7 is a plan view of the cartridge case similarly.

As shown in FIGS. 3 and 4, the rib 11 is formed so as to be inclined by an angle .theta. In a direction in which the inner peripheral side opens with respect to a line L extending outward from the center O of rotation of the disk. The ribs 11a on the upper case 1a side and the ribs 11b on the lower case 1b side are arranged such that the inclinations of the ribs 11a and 11b are in the same direction when the upper case 1a and the lower case 1b are closed (see FIG. 7). 3 and 4, the inclinations are opposite.

As shown in FIG. 4, the lower case 1b is provided with a sheet-like elastic piece 12, and when the upper case 1a and the lower case 1b are closed, the elastic piece 12 faces the projection 7, and The cleaning sheet 13 shown in FIG.

As shown in FIGS. 5 and 6, the outer periphery of the cleaning sheet 13 is ultrasonically welded to each of the upper case 1a and the lower case 1b. As the material, rayon fiber, polyester fiber, polyamide fiber, or the like is used.

When the rib 11 is inclined with respect to the line L (radial line of the disk), the length of the rib can be made longer than that of the rib parallel to the line L, so that the disk can be cleaned and the fluttering can be suppressed. The effect can be enhanced.

FIG. 8 is a plan view of a disk cartridge according to a second embodiment of the present invention. Note that the rib portion is shown by a solid line to emphasize the shape of the rib (the same applies to FIGS. 9 and 10).

In the example shown in FIG. 8, the width w2 on the outer peripheral side of the rib 11 is larger than the width w1 on the inner peripheral side of the rib 11 (w2> w1). Since the linear velocities are different between the outer circumference and the outer circumference of the disk, the contact time between the disk and the cleaning sheet 13 is set by setting w2> w1 as described above (the cleaning sheet 13 contacts the disk by the rib 11).
Are equal on the inner peripheral side and the outer peripheral side. Therefore, uniform cleaning can be performed as a whole.

FIG. 9 is a plan view of a disk cartridge according to a third embodiment of the present invention. In this example, w1> w2 is set, contrary to FIG. Since the air flow is faster at the outer periphery of the disk, by setting w1> w2,
The air resistance is substantially equal on the inner peripheral side and the outer peripheral side, and the rotation of the disk is stabilized.

FIG. 10 is a plan view of a disc cartridge according to a fourth embodiment of the present invention. In this example, the rib 11 is curved. Also in this case, the length of the entire rib 11 can be increased, and the effect of cleaning the disk and the effect of suppressing flutter can be enhanced.

FIG. 11 is a sectional view of a main part of a disk cartridge according to a fifth embodiment of the present invention. In this example, the rib 11a on the upper case 1a side and the rib 11b on the lower case 1b side
Are opposed to each other, and the cleaning effect of the magnetic disk 2 can be enhanced.

FIG. 12 is a sectional view of a main part of a disk cartridge according to a sixth embodiment of the present invention. In this example, the upper surface of the rib 11 is inclined so that the upstream end (left side in the figure) of the disk in the rotation direction is lower. This stabilizes the rotation of the disk.

FIG. 13 is a sectional view of a main part of a disk cartridge according to a seventh embodiment of the present invention. This example is shown in FIG.
Contrary to 2, the upstream end of the rib 11 in the rotation direction of the disk is made higher so that the corners enhance the dust scraping effect. The rib 11 shown in FIGS. 3 to 13 is assumed to be lower on the outer peripheral side than on the inner peripheral side as shown in FIGS.

[0030]

As described above, according to the present invention, the height of the rib for pressing the cleaning sheet against the disk is set to be lower on the outer peripheral side than on the inner peripheral side. A sufficient cleaning effect can be obtained on both the inner peripheral side and the outer peripheral side. It also has the effect of stabilizing the rotation of the disk.

[Brief description of the drawings]

FIG. 1 is a front view showing ribs of a disk cartridge according to an embodiment of the present invention.

FIG. 2 is a front view showing a modified example thereof.

FIG. 3 is a bottom view of the upper case before fixing the cleaning sheet in the disc cartridge according to the first specific example of the present invention.

FIG. 4 is a bottom view of the lower case before fixing the cleaning sheet.

FIG. 5 is a bottom view of the upper case after the cleaning sheet is fixed.

FIG. 6 is a bottom view of the lower case after the cleaning sheet is fixed.

FIG. 7 is a plan view of the cartridge case.

FIG. 8 is a plan view of a disc cartridge according to a second specific example of the present invention.

FIG. 9 is a plan view of a disc cartridge according to a third specific example of the present invention.

FIG. 10 is a plan view of a disc cartridge according to a fourth specific example of the present invention.

FIG. 11 is a sectional view of a main part of a disk cartridge according to a fifth specific example of the present invention.

FIG. 12 is a sectional view of a main part of a disk cartridge according to a sixth specific example of the present invention.

FIG. 13 is a sectional view of a main part of a disk cartridge according to a seventh specific example of the present invention.

FIG. 14 is an exploded perspective view of a general magnetic disk cartridge.

FIG. 15 is a bottom view of the upper case of a general magnetic disk cartridge.

FIG. 16 is a front view showing ribs of a conventional disk cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cartridge case 2 Magnetic disk 3 Shutter 4 Opening 5 Head insertion opening 6 Depression 7 Projection 8 Restriction rib 11 Rib 11-1 Groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Ariga 1-88 Ushitora, Ibaraki-shi, Osaka Inside Hitachi Maxell Co., Ltd. Hitachi Maxell, Ltd.

Claims (1)

[Claims] 1. A cartridge case, a disk rotatably housed in the cartridge case, and a cleaning sheet supported on an inner surface of the cartridge case, wherein an inner peripheral side of the disk is provided on an inner surface of the cartridge case. A disk cartridge having ribs extending from the inner peripheral portion to the outer peripheral portion, wherein the height of the rib is lower on the outer peripheral portion side than on the inner peripheral portion side of the disc.