JPS6258474A - Disk cartridge - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the contacting and sliding with the member for driving the disk and the case by forming projectingly the spacer to at least one side of the case and the disk body and holding always the space where the member to transfer the rotating force and the case cannot be contacted. CONSTITUTION:In the case where an upper case 3 and a lower case 4 molded by the synthetic resin are engaged and unified, a magnetic disk body 20 is freely rotatably accommodated. The cartridge is composed of a disk supporting plate 1 connected and fixed with a disk main body 5 in the outer circumferential part and a hub 2 formed by outserting molding to the disk supporting plate 1, and the hub 2 is constituted so as to insert and locate to an opening part 4a of the lower case 4, and the disk body is arranged to the prescribed position in the case always. In such a case, a projected part 9 formed projectingly to the disk supporting plate 1, whose peak part is very closely positioned to the inner surface of the upper case 3 always, is formed to the height to the extent in which the part is not contacted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge that stores a disk-shaped object such as a magnetic disk, and particularly to a disk cartridge that prevents contact and sliding between a disk drive member and a disk cartridge inside the disk cartridge. The present invention relates to a disk cartridge configured to prevent the above.

[Conventional technology]

3 and 4 show the structure of a conventional disk cartridge, and in particular, FIG. 4 shows a state in which a disk is rotatably housed in a case. Specifically, a magnetic disk body 20 is rotatably housed in a case in which an upper case 3 and a lower case 4 made of synthetic resin are integrated. The magnetic disk body 20 includes a flat donut-shaped disk body 5, a disk support plate 1 located at the central opening of the disk body 5, and connected and fixed to the disk body 5 at the outer circumference thereof, and the disk support plate 1. The hub 2 is formed by outsert molding. This hub 2
is configured to be inserted into the opening 4a of the lower case 4. For example, when the disk is transported, the disk body 5 may become eccentric within the case, and the outer periphery of the disk body may come into contact with the inner surface of the case and be damaged. is prevented.

When this disk cartridge is inserted into a disk drive device, the magnet 8 attached to the rotating shaft 21 on the drive device side comes into close contact with the disk support plate 1.
is made of a magnetic stainless steel plate), and the drive pin 7 of the spindle 6 is inserted into and engaged with the drive pin insertion hole 10 formed in the disk support plate 1, thereby ensuring that the rotational force of the rotating shaft 21 is transferred to the magnetic disk body 20. Communicate to the side.

[Problems to be solved by the present invention]

In the device with this configuration, the top of the drive pin 7 passes through the disk support plate 1 and protrudes toward the upper case 3.
When the case is deformed, the top of this drive pin 7 is attached to the upper case 3.
There is a possibility that a situation may occur in which the top portion contacts the inner surface of the upper case 3 and slides on the inner surface of the upper case 3 as the disk body 20 rotates. If such a situation occurs, not only will the rotation of the disk body 2o be adversely affected, but also the case may be worn out and the abrasion powder may cause problems in writing and reading information.

Therefore, an object of the present invention is to provide a disk cartridge having a structure that prevents contact and sliding between the disk drive member and the case.

[Means for solving problems]

In short, the present invention provides a case in which a disk body is rotatably housed in a case consisting of a lower case and an upper case that does not have a central opening, and a retaining hole formed at an eccentric position of a disk support plate and a disk drive device. In a case configured to rotate the disc body by engaging with a side pin (retaining member), the case is This disk cartridge is configured such that a spacer is formed protruding from at least one of the disk body and the case, so that even if the case is deformed, a space is always maintained such that the member for transmitting rotational force and the case do not come into contact with each other.

〔Example〕

Examples of the present invention will be specifically described below.

1 and 2 show a first embodiment of the invention.

A magnetic disk body 20 is rotatably housed in a case in which an upper case 3 and a lower case 4 made of synthetic resin are engaged and integrated. This magnetic disk body 20 is
A disk body 5 having a planar donut shape, a disk support plate 1 located at the central opening of the disk body 5 and connected and fixed to the disk body 5 at its outer periphery, and an outsert with respect to the disk support plate 1. The hub 2 is formed by molding. The hub 2 is configured to be inserted into the opening 4a of the lower case 4, so that the disk body is always placed at a predetermined position within the case. This structure prevents the disk body 5 from becoming eccentric within the case during transportation of the disk, thereby preventing the outer peripheral portion of the disk body from coming into contact with the inner surface of the case and being damaged.

Reference numeral 9 is a convex portion formed to protrude from the disk support plate 1. Although the top of the convex portion 9 is normally located very close to the inner surface of the upper case 3, it is formed at a height that does not make contact with the inner surface of the upper case 3. However, the height of this formation should be higher than the top of the drive pin 7, which is a disk engaging member that passes through the disk support plate 1 and protrudes toward the upper case 3 side, so that the minimum width W can be maintained even when the case is deformed. A space 12 is ensured to prevent the inner surface of the upper case 3 and the top of the drive pin 7 from sliding into contact with each other. Note that when the case is deformed, the protrusion 9 comes into contact with the inner surface of the upper case 3 in order to secure space, but even in this case, the protrusion 9 is shaped like a dome so as not to interfere with the rotation of the disk body 20. The contact surface between the convex portion 9 and the upper case 3 should not be too large.

When a disk cartridge with this configuration is set in a disk drive device, the magnet 8 attached to the rotating shaft 21 on the drive device side comes into close contact with the disk support plate 1 (usually this disk support plate 1 is made of a magnetic stainless steel plate). Further, the drive pin 7 of the spindle 6 is inserted into and engaged with the drive pin insertion hole 10 formed in the disk support plate 1, and the rotational force of the rotating shaft 21 is reliably transmitted to the magnetic disk body 20 side. In this case, even if the case is deformed, the space 12 having the minimum width W can be secured by the convex portion 9 serving as a spacer, so that the top of the drive pin 7 will not come into contact and slide. Note that it is not an essential condition that the disk support plate 1 be made of metal; it is possible to replace plastic by changing the engagement method with the drive device, such as by using a mechanical ramp method instead of magnetic attraction. Initially, it may be formed from a material that does not respond to magnetism.

FIG. 5 shows a second embodiment. In this example,
Instead of forming a convex portion on the disk support plate 1, a convex portion 13 is formed on the upper case 3 side.

Even in this configuration, if the height of the convex portion 13 is set so that the width of the space portion 12 can be maintained at the above value W, the same effects as in the first embodiment can be achieved.

FIG. 6 shows a third embodiment, in which the hub 2 of the disk support plate 1 is attached at a virtual circumference approximately equal to that of the hub 2 on the opposite surface, that is, the surface facing the inner surface of the upper case 3. A state in which a plurality of convex portions 14 are formed on the top is shown. This convex part 1
4 may be formed separately from the hub 2, but the hub 2 is attached to the opening formed in the disk support plate 1 [Fig. 1 (B)].
If the convex portion 14 can be formed integrally with the lever hub 2 by forming a part of the hub protruding from the opposite surface of the upper case 3, the manufacturing process can be simplified. can be converted into Further, the position where the convex portion 14 is formed need not be limited to a circumference approximately equal to that of the hub 2, and substantially the same effect can be obtained even if the convex portion 14 is formed at any position on the disk support plate 1. Furthermore, although not shown, the convex portion 14 may be formed to protrude toward the upper case side.

FIG. 7 shows a fourth embodiment and shows the configuration of the hub 2.

The hub 2 is formed into a substantially annular shape with a thousand faces as shown in FIG. It is formed. The thickness of the centering planes 2a and 2b is set so that the center of the spindle 6, which is a circle inscribed in this plane, coincides with the center of the hub 2 and the disk support plate 1. When the disk body 20 is attached to the spindle 6, the centering of the disk body 20 is performed.

As mentioned above, the hub 2 is formed and attached to the disk support plate 1 by a method such as outsert molding (
In this case, when forming the opening 1a of the disk support plate 1, if the part of the support plate that corresponds to this opening is bent toward the hub forming part and used as the support 1', then after the hub is formed, (Hub mounting can increase strength). In this configuration, centering is performed by bringing the outer periphery of the spindle 6 into contact with the centering planes 23a and 2b as described above, but when forming the hub 2, a sag 2' is formed at the corner on the spindle insertion side. often formed. In this case, the spindle 6 comes into contact with this sag 2' and cannot make contact with the centering plane, making it impossible to perform centering.Therefore, this sag 2' is removed after forming the hub. 7(C) shows an improvement on this point, in which the thick portions 2a', 2a' and 2b are 2b' (in the case shown, 2b' is shown as a recess), and the thickness of this thick part is defined as the width W of the recess 2',
The outer periphery of the spindle 6 is made to have a larger W8 than the above thickness, so that even if a sag 2' occurs, centering can be performed without having to remove this part. .

FIG. 8 shows a fifth embodiment. When the hub 2 is molded, in addition to the occurrence of the above-mentioned sagging part, the hub 2 shrinks in the circumferential direction and radial direction while it solidifies after being molded, but eventually the wall thickness of the hub 2 decreases as it solidifies. This results in a state of decrease. Conventionally, as shown in FIG. 9, the connection parts 16 between the hub 2 and the support plate 1 (the part of the hub 2 located at the opening of the support plate) were arranged at equal intervals in the circumferential direction of the hub 2. , a decrease in wall thickness due to shrinkage and solidification also occurs in all parts of the hub, and for this reason, the wall thickness of the preset centering plane becomes different from the set value due to solidification, and the centering becomes difficult. For this reason, as shown in FIG. 8, when attaching the hub 2, more connection parts 16 are arranged on the centering plane formation side than in the past, and together with connection parts 17 formed on the centering plane 2a12b itself, the hub 2 The number of connecting portions formed in the circumferential direction on the side where centering planes 2a and 2b are formed is increased compared to the conventional type. With such a configuration, when the hub contracts and solidifies, the large number of connections causes the centering plane to contract more in the non-formed part, and the centering plane 2a,
Prevents thinning of 2b.

〔effect〕

Since the present invention has the above configuration, even if the case is deformed, a space of a predetermined width is always secured by the convex portion serving as a spacer, so that the disk drive member such as the drive pin and the inner surface of the case are not in contact with each other. This can prevent the driving member from sliding against the inner surface of the case. Therefore, errors in recording and reproducing information due to poor rotation of the disk due to sliding and generation of abrasion powder do not occur, and the reliability of the apparatus can be maintained at a high level at all times.

Furthermore, improvements have been made to the attachment of the hub to the disk support plate and the shape of the hub, making it easier to center the disk body.

[Brief explanation of drawings]

Fig. 1 (A) is a bottom view of the disk support member with the hub attached, Fig. 1 (B) is a sectional view taken along line A-A in Fig.
The figure is a sectional view of the central part of a disk cartridge showing the first embodiment of the present invention, FIG.
4 is a sectional view of the center of a conventional disk cartridge, FIG. 5 is a sectional view of the center of a disk cartridge showing the second embodiment, and FIG. 6 is a sectional view of the third embodiment. FIG. 7 (A) is a bottom view of the disk support member, and FIG.
is a cross-sectional view taken along line C-C of (A), and (C) is a cross-sectional view of (B).
FIG. 8 is a plan view of a disk support member showing a fifth embodiment, and FIG. 9 is a plan view of a disk support member showing a conventional configuration. be. 1...Disc support plate 2...Hub 3...Upper case 4...Lower case 5...Disc body 9.13.14...Protrusion 12...Space 20... Disc body Fig. 1 (B) Fig. 2 Fig. 3 (A) Fig. 4 Fig. 5 Fig. 6 Fig. 7 (A) Fig. 7 and B Fig. 7 (C) Fig. 8 Fig. 9 WA

Claims (4)

[Claims] (1) A disk body is rotatably arranged in a case consisting of a lower case and an upper case that does not have an opening in the center, and the disk is placed at an eccentric position of the disk support plate that forms part of the disk body. A disk engaging member on the drive device side and a disk support plate are engaged with each other, and rotational force on the disk drive device side is transmitted to the disk body side via the disk engaging member, in which the disk body side and the upper case are connected to each other. 1. A disk cartridge characterized in that a convex portion is formed as a spacer on at least one of the sides so that a space sufficient to prevent the disk engaging member and the inner surface of the case from sliding into contact with each other is always secured. (2) The disk cartridge according to claim (1), wherein the convex portion is provided protruding from substantially the center of the disk support plate. (3) The disk cartridge according to claim (1), wherein the convex portion is provided to protrude from a surface of the inner surface of the upper case that faces the disk support plate. (4) The convex portion is formed on the surface of the disk support plate facing the inner surface of the upper case, and the convex portion is configured to be located approximately on the virtual circumference corresponding to the hub forming portion on the back surface of the disk support plate. A disk cartridge according to claim (1), characterized in that: