JP2547405Y2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disk cartridge for storing an optical disk or the like, and particularly to a disk holding mechanism for the disk cartridge.

(Prior Art) Generally, a disk cartridge for an optical disk or a magnetic disk is formed by combining two upper and lower halves, and a space for storing a disk is formed therein. In the center of the lower half, there is provided a turntable insertion hole for inserting a turntable for rotating the disk, and the upper and lower halves are adjacent to the turntable insertion hole for reading and writing. A head insertion hole into which the head is inserted is provided. The disk substrate has an opening in the center, and a dish-shaped hub made of a magnetic material is fitted into this opening, and its flange is adhesively fixed to the substrate. A spindle insertion hole into which the tip of the spindle on the turntable is inserted is provided at the center of the bottom of the hub. The disc is housed with the bottom of the hub having the spindle insertion hole facing down, and when mounted on the drive, the turntable is inserted from the turntable insertion hole and the spindle enters the spindle insertion hole of the hub. The bottom of the hub is fixed to the turntable by being attracted to the magnet on the turntable and rotates integrally.

By the way, in the above-mentioned disk cartridge, it is necessary to prevent the stored disk from rattling in the cartridge and to facilitate the positioning when the spindle is inserted. A rib for regulating the position of the disk is provided on the peripheral side. A gap between the magnet on the turntable and the disk is defined around the turntable insertion hole of the lower half of the cartridge, and an annular rib is projected to prevent the recording surface of the disk from coming into contact with the cartridge wall. Things have also been done.

(Problems to be solved by the invention) However, the rattling of the disk occurs not only in the radial direction but also in the vertical direction (axial direction). Therefore, in particular, in the case of a disk having a recording surface on the screen, it is necessary to take measures to prevent the recording surface from hitting the cartridge inner wall surface on the upper side, that is, on the side facing the turntable insertion hole. In addition, when such a double-sided recording disk is mounted upright, the hub surface, which is normally bulged from the disk substrate surface, may rub the cartridge wall surface. It is necessary to secure a gap between the hub and the wall surface of the upper half piece so as not to rub against the hub. However, the thickness of the cartridge as a whole must be kept to a predetermined size, and if the wall of the cartridge is too thin, there may be a problem of strength. There was naturally a limit, and the gap could not be sufficiently secured.

The present invention has been made in order to solve the above-mentioned problem, and prevents the hub in the center of the disc from rubbing the cartridge wall on the side facing the turntable insertion hole, and the cartridge wall on this side. It is intended to prevent the recording surface of the disc from hitting.

(Means for Solving the Problems) The present invention is a disk cartridge for accommodating a disk in which a hub is fitted into the center of a disk substrate and a flange of the hub is folded back on the opposite side to the turntable,
By combining a pair of halves on the turntable side and the opposite side, a space for storing a disk is formed inside, and a turntable insertion hole for inserting a turntable for rotating a disk is provided in the center of the half on the turntable side. At the periphery of the turntable insertion hole, an annular rib is provided at a position corresponding to the non-recording portion of the disk surface so as to protrude toward the disk by a predetermined amount. At a position corresponding to the non-recording portion of the disk surface outside the flange portion of the hub attached to the hub, an annular rib protruding toward the disk side by a predetermined amount is provided, and the entire wall surface located inside the rib is provided. The seating surface is recessed by a predetermined amount with respect to a wall surface located outside the rib so that the hub does not rub the seating surface.

(Operation) When the turntable is inserted into the turntable insertion hole provided in one half of the disk cartridge and the disk is rotated while being fixed to the turntable, the movement toward the other half of the disk is outside the flange portion of the hub. Therefore, the recording medium is regulated by an annular rib provided at a position corresponding to the non-recording portion on the disk surface, thereby preventing the recording portion on this side of the disk surface from hitting the cartridge wall surface. Further, the entire surface of the cartridge facing the hub inside the annular rib is a counterbore surface, and is recessed by a predetermined amount with respect to the wall surface outside the rib, so that the surface of the hub bulges from the disk surface. Even if the hub is formed, the surface of the hub is prevented from rubbing against the cartridge wall surface during rotation.

(Example) Hereinafter, an example is described based on drawings.

1 and 2 are a plan view and a bottom view of the cartridge 1 according to the present invention. 3 and 4 are sectional views taken along lines AA and BB of FIG. 1, respectively, each showing a state in which the disk 2 is stored.

This cartridge 1 is composed of two upper and lower halves 3,4. A turntable insertion hole 5 for inserting a turntable (not shown) is provided at the center of the lower half 4, and a read / write head (not shown) is inserted adjacent to the turntable insertion hole 5. A head insertion hole 6 is provided in both halves 3 and 4. In addition,
The turntable insertion hole 5 and the head insertion hole 6 of the lower half piece 4 are continuous holes. The two halves 3 and 4 are fixed to each other by bonding while the disc 2 is housed.

The disk 2 has a disk-shaped substrate 8 having an opening 7 in the center.
And a dish-shaped hub 9 fitted into the opening 7 of the substrate 8. The hub 9 is fitted into the opening 7 with the bottom 9a having the spindle insertion hole 10 at the center downward, and the flange 9b on the upper outer periphery is adhesively fixed to the substrate surface.

On the periphery of the upper and lower halves 3, 4, a rib 11 for regulating the radial position of the disk 2 is provided in a substantially annular shape. The lower half 4 is provided with an annular rib 12 at the periphery of the turntable insertion hole 5, and the upper half 3 is located slightly outside the outer edge of the flange 9 b of the hub 9 of the stored disk 2. A ring-shaped rib 13 is provided at a portion where the rib is formed. The rib 13 of the upper half 3 is separated from the recording portion of the disk 2 and faces the non-recording portion inside the rib. The wall surface 3a located inside the rib 13 is a counterbore surface which is slightly depressed as a whole with respect to the wall surface 3b located outside.

The height of the rib 13 provided on the upper half piece is, for example, 0.3 mm based on the outer wall surface of the rib 13. Also,
The inner concave amount is, for example, about 0.3 mm. On the other hand, in the case of a normal disk, the amount by which the upper surface of the hub 9 swells from the surface of the substrate 8 is at most about 0.6 mm. Therefore, even if the disk 2 moves upward in FIGS. 3 and 4, it is regulated by the ribs 13, so that an appropriate gap is secured between the disk 2 and the upper half 3, and Does not rub against the wall surface (counterboating surface) inside the rib 13. Further, by setting the height and the counterbore dimensions of the rib 13 to such values, it becomes possible to use disk cartridges of the same specification for various disks having different hub bulges.

The restriction of the radial position of the disk 2 and the position of the lower half piece 4 are performed in the same manner as in the prior art.
Done by 11,12.

(Effect of the Invention) Since the present invention is configured as described above, it is possible to prevent the hub in the center of the disk from rubbing the cartridge wall facing the turntable during rotation of the disk. It is possible to prevent the recording surface of the disc from hitting the cartridge wall surface on the side.

[Brief description of the drawings]

1 is a plan view of one embodiment of the present invention, FIG. 2 is a bottom view of the same, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG. 4 is a sectional view taken along line BB of FIG. is there. 1: disk cartridge, 2: disk, 3, 4: half piece, 5: turntable insertion hole, 9: hub, 13: rib.

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk cartridge for storing a disk in which a hub is fitted into the center of a disk substrate and a flange of the hub is folded back to a side opposite to the turntable, comprising a pair of a turntable side and a pair of opposite sides. A space for accommodating a disk is formed by combining the halves, and a turntable insertion hole for inserting the turntable for rotating the disk is provided in the center of the half on the turntable side, and a periphery of the turntable insertion hole is provided. At a position corresponding to the non-recording portion of the disk surface, an annular rib projecting a predetermined amount toward the disk side is provided, and the opposite half is formed by a flange portion of a hub mounted at the center of the stored disk. An annular rib protruding toward the disk by a predetermined amount is provided at a position corresponding to a non-recording portion on the disk surface on the outside, and the rib is provided. A disk cartridge characterized in that the entire wall surface located inside the hub is a seating surface and is depressed by a predetermined amount with respect to the wall surface located outside the rib so that the hub does not rub the seating surface. .