JPH0222871Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a disk cartridge in which a flat circular disk is rotatably housed in a disk case.This invention improves the support state of the disk within the disk case, and improves the disk drive side relative to the disk surface. The purpose is to improve the head contact, that is, the head touch.

In this type of disk cartridge, as shown in FIG. 3, a flat circular disk 2 is placed inside a hard disk case 1, and its upper and lower surfaces are sandwiched between nonwoven fabric liners 12, 12 lined on the upper and lower inner surfaces of the case 1. It is housed in a safe condition. This disk 2
The magnetic sheet is typically a magnetic sheet in which a magnetic layer is formed on a base film such as polyester, and since it is a flexible thin sheet-like material, it easily deforms into a wavy shape when rotated. This deformation of the disk 2 is suppressed by the non-woven fabric liners 12, 12, but the non-woven fabric liners 12, 12 are originally intended for cleaning the disk surface, and when they come into strong elastic contact with the entire disk surface, the disk 2 Since the rotational torque of the disk 2 becomes too high and the rotational performance of the disk 2 deteriorates, it is not possible to firmly clamp and hold the upper and lower surfaces of the disk 2 over the entire surface, even if strong pressure contact may be made locally.

Therefore, in the conventional configuration, the flexible disk 2 still deforms during rotation. especially,
Since the non-woven fabric liner 12 is lined avoiding the head insertion window 4 of the disk case 1, the deformation that occurs in the disk 2 will be noticeable at the critical location where the head insertion window 4 is present. As a result, the head on the disk drive side, which contacts the disk surface through the head insertion window 4, has poor contact, which may lead to track deviation and output fluctuation.

Therefore, the present invention is based on the fact that the disk 2 is a flexible flat circular sheet-like body and that the disk 2 rotates around the drive shaft insertion window 3 provided in the center of the disk case 1. Focusing on the disk 2 rotating on the left and right sides of the drive shaft insertion window 3
The disk 2 is supported so that its outer circumferential side is raised in a curved shape, and the disk 2 has a self-reinforcing function with the bending stress generated within itself at the location where the head insertion window 4 is located in front of the drive shaft insertion window 3. This is to ensure that no waving or flapping occurs.

The details will be explained below based on the drawings. FIG. 1 shows an example of the disk cartridge according to the present invention, which is made of plastic upper and lower cases 1.
It consists of a hard disk case 1 formed by joining a and 1b with lids together, and a disk 2 rotatably installed inside the case 1.

The disk case 1 has a drive shaft insertion window 3 in its center, a head insertion window 4 in front of the drive shaft insertion window 3, and an index hole 5 near the drive shaft insertion window 3.
are formed in a vertically penetrating shape, respectively. In the figure, a head insertion window 4 is separately provided in front of the drive shaft insertion window 3, but this head insertion window 4 is formed in a continuous manner in front of the drive shaft insertion window 3, and the head is connected to the disk 2. It is also possible to have a large writing space.

In Figures 2 and 3, upper and lower cases 1
On each inner surface of the drive shaft insertion window 3, annular surrounding walls 6, 6 concentric with the outer periphery of the drive shaft insertion window 3 are vertically opposed and abutted against each other. A disk 2 is rotatably housed inside.

The disk 2 is a flexible flat circular sheet-like body, and in the illustrated example, it is a magnetic sheet with a magnetic layer formed on a base film such as polyester, and has a hub facing the drive shaft insertion window 3 in the center. 7 are connected together. Of course, this disk 2 may also be a so-called optical disk.

Inside the disk case 1, a pair of upper and lower shutter members 9 for opening and closing the head insertion window 4 and the index hole 5 are assembled so as to be rotatable within a certain angle range around the boss 3a of the drive shaft insertion window 3, and when not in use. The shutter member 9 always closes the head insertion window 4 and the index hole 5, and when the disc drive is loaded, the shutter member 9 is rotated via the slide operation member 10 to close the head insertion window 4.
Then, the index hole 5 is automatically opened.

A liner 12 having a horseshoe shape in plan view is lined around the outer periphery of the drive shaft insertion window 3 on each inner surface surrounded by the surrounding walls 6 of the upper and lower cases 1a and 1b, avoiding the head insertion window 4. The liner 12 is generally made of a nonwoven fabric made of synthetic resin fibers, and is integrally attached to the inner surface of the case by spot welding or adhesion, either entirely or partially. Reference numeral 13 indicates this liner lining surface.

In Figures 2 and 4, upper and lower cases 1
The liner lining surface 13 on each of the inner surfaces of a and 1b is provided with a flat raised portion 14 at the rear left and right center portion of the drive shaft insertion window 3, that is, at a portion facing the head insertion window 4 with respect to the drive shaft insertion window 3. Protrude in opposite directions. In the illustrated example, the upper and lower cases 1a, 1
It is assumed that the raised parts 14, 14 of b are on the virtual center line that passes through the center point of the drive shaft insertion window 3 and divides the head insertion window 4 into left and right halves, and are correctly vertically opposed to each other, but the upper and lower raised parts 14, 14 may be opposed to each other with their positions shifted left and right.

Thus, when the disc cartridge of the present invention is loaded into the disc drive, the drive shaft on the disc drive side engages with the hub 7 through the drive shaft insertion window 3 to rotationally drive the disc 2, and the head on the disc drive side It slides into contact with the disk surface through the insertion window 4. Upper and lower non-woven fabric liners 1
2 and 12 lightly contact both surfaces of the rotating disk 2, and in particular strongly contact the disk surface only at the locations where the ridges 14 and 14 are present, thereby cleaning the disk surface well while rotating the disk 2 with low torque. . In the illustrated example, the hub 7 is made of plastic and engages with a bifurcated drive shaft to rotate the disk 2. However, the hub 7 is made of a magnetic stainless steel plate and the disk 2 is rotated by a magnetic cap method. may also be rotated.

The present invention provides a disk cartridge having such a basic structure, as shown in FIGS. 2 and 3. Rib-shaped convex members 15, 15 are placed at positions shifted by 90 degrees from each other, that is, at positions symmetrical to the left and right sides of the drive shaft insertion window 3.
The convex member 1 is provided protrudingly through the nonwoven fabric liner 12.
It is characterized in that the disk 2 is received and supported in a curved shape in which the outer peripheral side is lifted by utilizing its own flexibility between 5 and 15.

In such a case, the disk 2 is inserted into the convex members 15 located on the left and right sides of the drive shaft insertion window 3, as shown in FIG.
15, the outer peripheral side is flexibly deformed and supported in a concave curved shape that gently lifts upward, and a concave curved trough 2a of the disk 2 is formed in the front-rear direction of the drive shaft insertion window 3, and even when the disk 2 is in a rotating state, it is supported as shown in FIG. As shown in the figure, the concave valley 2a always faces the head insertion window 4 of the lower case 1b, and since bending stress is generated in the concave valley 2a, a self-reinforcing function works to prevent deformation. . Also when the head H contacts the concave valley 2a of the disk 2 through the head insertion window 4 on the lower case 1b side as shown in
is not deformed by the contact pressure of the head H.

Next, a more specific example will be described.

Embodiment As shown in FIGS. 2 and 5, the liner lining surface 13 of the lower case 1b has a height h from the inner surface of the lower case 1b, preferably 0.05 to 0.5 mm, actually 0.2 mm,
The circumferential length L is preferably 1.0 to 30 mm, but actually
10 mm, and the radial length D is preferably 1.0 to 30 mm.In practice, convex members 15, 15 of 3 mm are provided symmetrically with respect to the drive shaft insertion window 3, and the thickness of the disk case 1 is
A disk cartridge containing a disk 2 having a diameter of 77 μm and a diameter of 72 mm was prepared as shown in FIG. 2, and this was loaded into a disk drive for practical testing.

As a result, output fluctuation characteristics with a waveform as shown in FIG. 7 were obtained. As is clear from this output fluctuation characteristic, when compared with the output fluctuation characteristic shown in FIG. 8 obtained with the conventional type in which the disk 2 is supported in a horizontal position within the disk case 1, it is found that there is an extreme decrease in output. It was confirmed that a was almost eliminated and the output fluctuation was extremely small.

Although the illustrated example is as described above, the present invention is not limited thereto. For example, convex member 1
5 and 15 are desirably provided at correct left-right symmetrical positions in the drive shaft insertion window 3, but may be provided near the position in some cases. Also, lower case 1b
In the liner lining surface 13 of the drive shaft insertion window 3, a plurality of protrusions 15 are provided at the inner and outer positions with different radii on the left and right sides of the drive shaft insertion window 3, so that the outer one protrudes higher than the inner one, or each protrusion member 15 is The design can be changed as appropriate by adopting various shapes with rounded corners to smoothly guide the disk 2 thereon. In addition, the illustrated nonwoven fabric liner 12 is not essential to the present invention. In such cases, the protruding member 15 does not need to be integrally molded with the cartridge case 1, and in a configuration in which the protruding member 15 is in direct contact with the disk 2, an appropriate material can be selected for the protruding member 15 itself. .

As explained above, according to this invention, the convex members 15, 15 are provided at the left and right positions of the drive shaft insertion window 3, and the disk 2 is supported to curve in a concave shape between the convex members 15, 15. Since the disk 2 has a self-reinforcing function due to the bending stress generated in itself at the location where the head insertion window 4 is located in front of the drive shaft insertion window 3, deformation is difficult to occur. Good head touch can be ensured,
Effective in preventing track deviation and output fluctuation.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view illustrating a disk cartridge according to the present invention, FIG. 2 is a plan view showing the internal structure, and FIG. 3 is a sectional view taken along the - line in FIG.
FIG. 4 is a sectional view taken along the - line in FIG.
FIG. 5 is a schematic front view showing the supporting state of the disk;
FIG. 6 is a sectional view taken along the line -- in FIG. 2, FIG. 7 is a diagram showing the output fluctuation characteristics of the disk cartridge of the present invention, and FIG. 8 is a diagram of the output fluctuation characteristics of the conventional disk cartridge. 1...disk case, 2...disk, 3...
... Drive shaft insertion window, 4 ... Head insertion window, 7 ... Disk hub, 12 ... Nonwoven fabric liner, 13 ...
liner lining surface, 14... raised portion, 15... convex member;

Claims (1)

[Claims for Utility Model Registration] Consisting of a disk case 1 and a disk 2 rotatably installed in the disk case 1, the disk case 1 has a drive shaft insertion window 3 in the center thereof, and a drive shaft insertion window 3. A head insertion window 4 is provided in front of the window 3, and the disk 2 is a flexible, flat, circular sheet-like body. , and protruding members 15, 15 are provided at left and right positions of the drive shaft insertion window 3, and the outer peripheral side of the disk 2 is lifted and supported by the protruding members 15, 15.