JPH03219481A - Disk cartridge - Google Patents

Abstract

PURPOSE:To reinforce a triangular protrusion which is weak in its structural machine rigidity and to strengthen the mechanical rigidity of the disk cartridge by affording a rigidity improving means to the cartridge case made of resin at least in the vicinity of a V-shaped opening part. CONSTITUTION:A metal plate 14 is fitted to the opening part 11 on a cartridge half 10 made of resin, and holes 15 and 16 of the metal plate 14 are engaged with pins 12 and 13 of the cartridge half 10 and thermally deposited, thus integrating the cartridge half 10 with the metal plate 14 and forming an approximately V-shaped opening part 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge that accommodates and holds recording media such as optical disks and magneto-optical disks.

[Prior Art] An optical disk or magneto-optical disk system is composed of a cartridge containing an optical disk or magneto-optical disk and a drive device for recording, reproducing, or erasing information on the optical disk or magneto-optical disk. It has advantages such as high-density recording and high disk transportability. However, the optical head of the drive device has optical components (
Because they are equipped with lenses, prisms, etc., they are heavier than magnetic recording heads such as node disks, making it difficult to access information at high speed.

There is a method of using a plurality of heads to achieve apparent high-speed access, and the present applicant has proposed a disk cartridge compatible with a drive device having a plurality of heads.

FIG. 8 shows its configuration. In the figure, reference numeral 1 indicates a magneto-optical disk, a hub 2 is provided at the center of the magneto-optical disk 1, and is rotated by being clamped by a turntable at the tip of a spindle motor of a drive device. The cartridge 3 is composed of an upper half 4a and a lower half 4b,
It has an opening 5 which is approximately in the shape of a ■. Opening 5 is hub 2
This allows the turntable to approach the magneto-optical disk 1, and also allows the optical head to access the magneto-optical disk 1. Two optical heads are provided on one side of the magneto-optical disk 1, and seek on axes A and B, respectively. Therefore, the opening 5
has a substantially V-shape, and the upper half 4a has a substantially triangular protrusion 7.
is formed.

Further, a shutter 6 for shielding the opening 5 is provided so as to be freely movable in the vertical direction of the paper, and protects the magneto-optical disk 1 from adhesion of dirt, dust, etc. when the cartridge 3 is not in use. Note that 6 indicates the position of the shutter when the opening is closed, and 6° indicates the position of the shutter when the opening is open.

Further, the materials used for the upper half 74a and the lower half 4b are resins such as polycarbonate and ABS because they are easy to operate, lightweight, inexpensive, and have a good appearance.

[Problems to be Solved by the Invention] FIG. 9 shows a perspective view of the upper half 4a. Approximately triangular protrusion 7
Since it has a structure of a so-called r cantilever beam J from the upper half 4a with the axis 8 as a boundary, it tends to bend when an external force is applied to the point 9 in a direction perpendicular to the plane of the paper, for example. When the cartridge 3 is bent inward, it comes into contact with the magneto-optical disk 1,
This will cause the disc to rub, becoming a source of dust, etc., and scratching the magneto-optical disc 1. Also, cartridge 3
If it bends outward, the shutter 6 will bite into the substantially triangular protrusion 7 when it closes. 10(a) shows a state in which the substantially triangular protruding portion 7 is normal, FIG. 10(b) shows a state in which the substantially triangular protruding portion 7 is bent inward of the cartridge 3, and FIG.
C) shows a state in which the cartridge 3 is bent in the outward direction.

A problem arises when the situation as shown in FIGS. 10(b) and 10(c) arises.

An object of the present invention is to provide a disk cartridge that has sufficient mechanical rigidity and is compatible with a plurality of heads by reinforcing the approximately triangular protrusion 7, which is a portion with weak structural mechanical rigidity.

[Means for Solving the Problems] In order to achieve the above object, the disk cartridge of the present invention includes a case made of resin having a substantially V-shaped opening, and a shutter that can be moved freely to cover the opening. and,
In a disk cartridge comprising an elastic means for biasing the shutter in a closing direction and a disk 7 information recording medium rotatably housed in the case, at least near the approximately V-shaped opening of the case, It is characterized by being provided with means for improving rigidity.

[Function] According to the above invention, the rigidity of the substantially triangular protrusion 7 is increased by the rigidity improving means, so that even if a force is applied from the outside, it will not remain in the state shown in FIGS. 1O (b) and (c). can be avoided.

[Example] The present invention will be explained in detail below.

FIG. 1 is a perspective view of a first embodiment of a disk cartridge according to the present invention. In the figure, reference numeral 10 indicates a cartridge half made of resin such as polycarbonate or ABS, and an opening 1 is provided above the cartridge 8-710.
1.

On the upper side surface 10a of the cartridge half 10, bins 1213 protruding inward from the cartridge half 10 are formed at regular intervals. Further, the metal plate 14 is provided with holes 15 and 16 that engage with the bottles 12 and -13, and by thermally welding the bottles 12 and 13 to the metal plate 14, the cartridge half 10 and the metal plate 14 are integrated. become

Cartridge half 10 and metal plate 1 integrated as shown in Fig. 2
4 is shown. By fixing the metal plate 14, a substantially V-shaped opening 17 is formed.

Here, the elastic modulus of polycarbonate resin is 220 kg
f/'mm", and the metal plate 14 (SS-41) is 2
1000 kgf/mm". Therefore, even if a stress is applied to the point 18 at the tip of the metal plate 14 in the direction perpendicular to the plane of the paper, the metal has an elastic modulus two orders of magnitude larger than that of resin, so it will not bend easily, and as mentioned above. No problems arise.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, a metal wire 21 is insert-molded into the cartridge half 19 made of resin along the sides of the substantially triangular protrusion 7 . Therefore, it is possible to improve the mechanical rigidity (also related to the elastic modulus) of the substantially triangular protrusion 7 forming the substantially V-shaped opening 20. Note that it is clear that the same effect can be obtained with a metal bar or a metal strip instead of a metal wire.

Other embodiments of the present invention are shown in FIGS. 4, 5, and 6.

In these figures, reference numerals 22 and 23 are metal plates provided instead of resin to improve the mechanical rigidity of the approximately triangular protrusion 7, or metal bands stretched over the surface of the resin. Further, 24 is a metal rod insert-molded into the approximately triangular protrusion 7.

In addition, in the above-mentioned embodiment, a case was shown in which the rigidity was improved by providing a metal wire, a metal rod, or a metal band on the substantially triangular protrusion 7 mainly from the viewpoint of simplicity and cost.
It is clear that the material for the reinforcing member in the present invention is not limited to metal. For example, a material such as hardened plastic may be used instead of the metal rod or metal strip. Further, as shown in FIG. 1, the substantially triangular protrusion 7- itself may be formed of hardened plastic.Alternatively, as shown in FIG. Even if reinforcing protrusions 30 having a hemispherical or rectangular cross section are attached to the recording medium without contacting the recording medium, a certain degree of reinforcing effect can be obtained.

[Effects of the Invention] As described above, in the present invention, the rigidity improving means is provided at least in the vicinity of the approximately V-shaped opening of the cartridge case made of resin, particularly in the approximately triangular protrusion. It is possible to improve the mechanical rigidity of a cartridge case having a substantially V-shaped opening.

[Brief explanation of drawings]

1 and 2 are views showing a first embodiment of the disk cartridge of the present invention, and FIGS. 3, 4, 5, 6, and 7 are views showing other embodiments of the present invention, respectively. 8 and 9 are diagrams showing the configuration of conventional disk cartridges, respectively, and FIGS. 10(a) and 10(b) show an example.
(c) is a diagram for explaining the problems of conventional disk cartridges. (1 idiot) (a) cf) (C)

Claims (1)

[Scope of Claims] A case made of resin having a substantially V-shaped opening, a slidable shutter for shielding the opening, an elastic means for biasing the shutter in a closing direction, and a case in the case. What is claimed is: 1. A disk cartridge comprising a disc-shaped information recording medium rotatably housed in the case, wherein a rigidity improving means is provided at least in the vicinity of the substantially V-shaped opening of the case.