JPH04111034U - flexible magnetic disk cartridge - Google Patents

Abstract

(57) [Summary] [Purpose] A 2” flexible magnetic disk cartridge can be attached to and removed from the spindle shaft of a disk drive by changing the shape and attachment position of the flexible magnetic disk hub and centering leaf spring. A flexible magnetic disk cartridge that does not cause disk rotation defects or disk attachment/detachment defects even after being repeatedly attached to and detached from a device. [Structure] The centering leaf spring 7 is formed into a semi-cylindrical shape, and its radius of curvature is 14 mm. ~28 mm, and the center of curvature, the surface of the magnetic disk, the spindle shaft 11 of the disk drive device, and the point of contact between the centering leaf spring 7 are on the same plane, and the hub 5 is The shape of the outer peripheral surface is configured to be in close contact with the centering leaf spring.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a flexible magnetic disk cartridge, and particularly to a flexible magnetic disk cartridge. A flexible magnetic disk that allows for smooth rotation of the magnetic disk when the device is inserted. It concerns disk cartridges.

0002

[Conventional technology]

With the rapid spread of personal computers, flexible disks have become popular as external storage devices. The use of flexible magnetic disks (hereinafter referred to as magnetic disks) has become widespread. As computers become smaller, the size of magnetic disks has also increased from 8" to 5.5". 25” and 3.5”, and recently they are equipped with 2” magnetic disks. Disk drive devices based on this technology are also beginning to be adopted. This 2” magnetic disk is 3.5 ``The so-called hard card cartridge type represented by the microfloppy disk.'' It is a flexible magnetic disk, but it differs from a 3.5” magnetic disk in terms of component structure and They are made of different materials, and as shown in Fig. 5, the hub 5 is equipped with a centering leaf spring 7. The fixed magnetic disk 8 is attached to a non-woven fabric liner 6 for removing dust on the disk. It has a structure to be inserted into the upper shell 2 and the lower shell 1.

0003 As a result, new features not seen on 3.5" magnetic disks (hereinafter referred to as disks) Many problems have been discovered. For example, a 2” flexible magnetic disk In this case, the centering leaf spring 7 is attached to a hub 5 fixed to the center of the magnetic disk 8 surface. It is installed in the disk cartridge (hereinafter referred to as cartridge) and drives the disk When inserting into the device, align the center of the hub with the center of the spindle shaft on the disk drive side. It is one of the most important parts of 2” floppy disks. ing. The performance required of this centering leaf spring is Even if it is repeatedly attached to and detached from a moving device, it remains stably attached to the hub and maintains its original function. It is to be. The inventors of the present invention focused on this point and conducted various studies, and found that In conventional centering leaf springs (hereinafter referred to as leaf springs), the leaf spring is perpendicular to the disk surface. When the cartridge is inserted into the drive, the disc is attached to the hub in the direction Because the spring approaches perpendicular to the spindle shaft from the insertion port, the leaf spring and spindle shaft Upon initial contact, a large force is applied that pushes the leaf spring in the hub upwards. Therefore, if you repeatedly attach and detach the disc, the leaf spring may come off the hub. It was found that a problem occurred. In other words, attaching and detaching a magnetic disk to a disk drive As the number of times increases, the leaf spring ends up overhanging the top of the hub, When the disk rotates, it may come into contact with the parts on the drive unit and make an abnormal noise, or due to abnormal rotation. If it interferes with recording/playback, or if the leaf spring lifts up too much, remove the device. The rotation of the disk may suddenly stop, or even the cartridge may be pulled into the insertion slot when ejecting it. There is no risk of the leaf spring becoming stuck and causing damage to the internal parts of the drive unit. I'm here. Therefore, even under complicated usage conditions, highly reliable frames with no defects can be achieved. In the current situation where flexible magnetic disks are in demand, Increasing the reliability of disk components is an extremely important issue.

0004

[Problem that the idea aims to solve]

The present invention was made in view of the current situation. That is, the purpose of this invention However, the 2" floppy disk was repeatedly inserted and removed from the disk drive. Excellent reliability, with no disk rotation problems or installation/removal problems The purpose of the present invention is to provide a flexible magnetic disk cartridge.

[0005]

[Means to solve the problem]

In this invention, the hub fixed to the center of the magnetic disk surface is connected to the hub center and the disk. Equipped with a centering leaf spring that has the function of aligning the center of the spindle axis of the drive device. In a flexible magnetic disk cartridge that stores a magnetic disk, The leaf spring has a generatrix perpendicular to the center line of the spindle axis and an arcuate conducting wire, It is machined into a cylindrical surface that is convex toward the spindle axis, and the curvature of the cylindrical surface is The center extends from the point of contact between the leaf spring and the spindle shaft toward the outer circumference of the disk. It is on the normal line of the spindle axis passing through the contact point, and its radius of curvature is 14 mm to 28 mm. We provide flexible magnetic disk cartridges characterized by a range of It is something that

[0006] That is, the present invention has 1. The hub is fixed to the center of the magnetic disk surface. A centering plate that has the function of aligning the center of the spindle axis of a disk drive device. A flexible magnetic disk cartridge that houses a magnetic disk with a In the above, the centering leaf spring is perpendicular to the axial center direction of the spindle shaft. It has a generating line and an arc-shaped conducting wire, and is machined into a semi-cylindrical shape that is convex toward the spindle axis. and the center of curvature of the semi-cylindrical surface and the contact point between the centering leaf spring and the spindle shaft. It is on the same plane as the outer peripheral surface of the magnetic disk, and in the direction of the axis center of the spindle shaft. A frame characterized by being located on a line and having a radius of curvature in the range of 14 mm to 28 mm. Flexible magnetic disk cartridge. 2. It is fixed to the center of the magnetic disk surface. The surface of the hub that contacts the centering leaf spring has a convex semicircular shape toward the spindle axis. Connects the center of curvature of the semicircular surface and the outer peripheral surface of the magnetic disk. The straight line is perpendicular to the axial center direction of the spindle shaft, and the semicircular surface is the inner part of the centering leaf spring. A flexible magnetic disk card characterized by being formed in close contact with the circumferential surface. cartridge.

[0007]

[Effect]

Normally, the centering leaf spring 7 is shown in Figs. 6 and 7 in conventional magnetic disk cartridges. As shown, it is attached to the hub 5 parallel to the disk centerline 14. For centering The leaf spring 7 is connected to two spindle shafts 11 on the hub side as shown in FIG. With the contact surface 15, it contacts the spindle shaft during disk rotation and centers the hub It has the function of aligning the center of the spindle axis. The present invention is as shown in Figures 3 and 4. , the centering leaf spring is a semi-cylindrical leaf perpendicular to the center line of the spindle shaft. It has a spring generatrix 22 and a leaf spring conductor 23 which is an arcuate semi-cylindrical shape, and is connected inside the spindle. The semi-cylindrical shape of the centering leaf spring according to the present invention is made into a semi-cylindrical shape that is convex toward the center axis. It is attached to a hub that has a surface machined to the same curvature as the inner surface of the hub. Also, the centering shown in Figure 4 The center 18 of the curvature of the curved surface of the centering leaf spring 7 and the spindle shaft 11 The contact point 21 between the leaf spring and the spindle and the surface direction of the magnetic disk 8 are aligned with the spindle. It is installed so that it matches the normal direction of the center axis, and the curvature half of the centering leaf spring The diameter is 14 mm to 28 mm from the contact point 21 of the leaf spring and spindle to the outer circumferential side of the magnetic disk. It is set in the range of mm. By having such a centering leaf spring structure, The lower side of the leaf spring is located further away from the center of the spindle axis than before, and the cartridge This prevents contact that would cause force to push the leaf spring upward during insertion, making insertion easier. The process from fixing the magnetic disk to the magnetic disk position is performed smoothly. Also, the magnetic disk drive After the magnetic disk cartridge is fixed during installation, the leaf spring will close while the magnetic disk is rotating. The upper side remains in contact with the spindle shaft as before even when the magnetic disk is rotating. centering function is maintained. Therefore, the centering leaf spring using the present invention and By using a flexible magnetic disk cartridge with a built-in hub, magnetic When inserting the disk cartridge into the disk drive device, the centering leaf spring The load is reduced, and as a result, the installation of the centering leaf spring is stable and the centering function is maintained at all times. It can be made into a highly reliable flexible magnetic disk cartridge. .

[0008]

【Example】

Examples of the present invention will be described below. (Example 1) It is equipped with a leaf spring for centering the internal structure of the cartridge shown in Fig. 1, and as a hub shown in Fig. 2. The shape shown is used as a centering leaf spring with a half curvature as shown in Figures 2, 3, and 4. Created with diameter R = 14 mm, 2” floppy disk with a recording capacity (unformatted) of 1 MB. 100 P disks were prepared and used as test samples. Each test sample was After 10,000 times of attachment/detachment to and from the Tests were conducted for the presence or absence of stoppage and the value of the output voltage. The test results are shown in Table 1.

[0009] (Example 2) Figure 2 shows a hub equipped with a centering leaf spring for the internal structure of the cartridge shown in Figure 1. The shape shown is used as a centering leaf spring with the shape shown in Figs. 2, 3, and 4, and the radius R. =28mm, 2” floppy with a recording capacity (unformatted) of 1MB 100 discs were made and used as test samples. Each test sample has the same test items as Example 1. I tested it visually. The results are shown in Table 1.

0010 (Example 3) It is equipped with a leaf spring for centering the internal structure of the cartridge shown in Fig. 1, and as a hub shown in Fig. 2. The shape shown in is used as a centering leaf spring with the shape shown in Figures 2, 3, and 4 and the curvature. Created with radius R = 12mm, 2” floor with recording capacity (unformatted) 1MB. 100 discs were prepared and used as test samples. Each test sample is the same as Example 1 The test items were tested. The results are shown in Table 1.

[0011] (Example 4) Figure 1 shows a hub equipped with a leaf spring for centering the internal structure of the cartridge shown in Figure 1. The shape shown in is used as a centering leaf spring with the shape shown in Figures 2, 3, and 4 and the curvature. Created with radius R = 30mm, 2” floor with recording capacity (unformatted) 1MB. 100 discs were prepared and used as test samples. Each test sample is the same as Example 1 The test items were tested. The results are shown in Table 1.

0012 (Comparative example 1) Conventionally, the hub is equipped with a leaf spring for centering the internal structure of the cartridge as shown in Figure 6. Create a file with the shape shown in Figure 7, which is commonly used, and unformat 1MB of 2 ``100 floppy disks were created and used as test samples.Each test sample was an example. The same test items as 1 were tested. The results are shown in Table 1.

[0013]

[Table 1] Breakdown of the number of results after each sample cartridge test

[0014] In Table 1, the output abnormality is caused by unstable contact between the disk and the magnetic head of the drive unit. As a result, the playback output of the required value cannot be obtained, and abnormal noise may occur due to the disc. This shows the sound produced by the contact between the drive device and the leaf spring, but based on the results in Table 1, the present invention The radius of curvature of the leaf spring is preferably 14 mm to 28 mm, and if it is less than 14 mm, Abnormal noises suddenly increase, and there is no effect if the radius of curvature is 30 mm or more. is clearly revealed.

[0015] In this example, a 2” floppy disk was explained, but the effect of the present invention is is not limited to 2” microfloppy disks, but also magnetic disks. The center of the hub and the spindle shaft of the disk drive unit are attached to the hub glued to the inner circumference of the If it is a magnetic disk equipped with a centering leaf spring that has the function of aligning the centers, it is acceptable. It is natural that the same effect as in the example is observed, and other disk cartridges can also be used. It goes without saying that the present invention can also be applied to this type of disk drive device.

[0016]

[Effect of the idea]

As can be seen from Table 1, the 2” flexible magnetic disk cartridge according to the present invention The hub and centering leaf spring are convex in the direction of the spindle axis. This structure prevents the disk from rotating even if it is repeatedly attached to and detached from the disk drive unit. To provide a highly reliable flexible magnetic disk that does not cause defects. I can do it.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the shapes of a centering leaf spring and a hub in an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the centering leaf spring portion shown in FIG. 1;

FIG. 3 is an external perspective view of the centering leaf spring according to the present invention.

FIG. 4 is a cross-sectional view of the centering leaf spring according to the present invention, taken along a plane including the diameter of the disc perpendicular to the leaf spring and the center line of the disc.

FIG. 5 is an exploded external perspective view showing the configuration of a 2” floppy magnetic disk cartridge.

FIG. 6 is a sectional view showing the shapes of a centering leaf spring and a hub in a conventional example.

FIG. 7 is a plan view showing a conventional centering leaf spring and hub.

[Explanation of symbols]

1 Upper shell 2 Lower shell 3 Shutter 4 Ring 5 Hub 6 Non-woven fabric liner 7 Centering leaf spring 8 Magnetic disk 9 Shutter lock pawl spring 10 Data window section 11 Spindle shaft 12 Magnetic recording surface 13 Spindle surface 14 that supports the hub Disk center Line 15 Contact surface between the hub and spindle shaft 16 Disc diametrical direction perpendicular to the leaf spring 17 Disc diametrical direction parallel to the leaf spring 18 Center of curvature of the curved surface of the leaf spring 19 Radius of curvature 20 The contact surface between the leaf spring and the spindle, Normal line 21 passing through the contact point Contact point 22 of the leaf spring and spindle Generating line 23 of the leaf spring which is a semi-cylindrical surface Conductor of the leaf spring which is a semi-cylindrical surface

Claims (2)

[Scope of utility model registration request] Claim 1: A magnetic disk is housed in a hub fixed to the center of the magnetic disk surface, and the magnetic disk is equipped with a centering leaf spring that has a function of aligning the center of the hub with the center of the spindle axis of the disk drive device. In the flexible magnetic disk cartridge, the centering leaf spring has a generating line perpendicular to the axial center direction of the spindle shaft and an arcuate conducting wire, and is processed into a semi-cylindrical shape that is convex toward the spindle shaft, In addition, the center of curvature of the semi-cylindrical surface, the point of contact between the centering leaf spring and the spindle shaft, and the outer peripheral surface of the magnetic disk are on the same plane, and are located on the normal line to the axis direction of the spindle shaft, and the curvature A flexible magnetic disk cartridge characterized in that the radius is in the range of 14 mm to 28 mm. 2. The hub, which is fixed to the center of the magnetic disk surface, has a surface in contact with the centering leaf spring that is machined into a semicircular shape convex toward the spindle axis, and the curvature of the semicircular surface is A straight line connecting the center of the magnetic disk and the outer circumferential surface of the magnetic disk is perpendicular to the direction of the axis of the spindle shaft, and the semicircular surface is formed so as to be in close contact with the inner circumferential surface of the centering leaf spring. Flexible magnetic disk cartridge.