JP2947765B2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge in which a flexible disk, a hard disk, and particularly an optical disk is rotatably housed in a case.

[0002]

2. Description of the Related Art In general, an information medium, for example, a magnetic disk, an optical disk or a magneto-optical disk is sometimes housed in a transparent or translucent case so that the state of housing can be seen through. It is used by setting it on a playback device. In a conventional synthetic resin injection molded product of this type of case, various types of release means are used to release the product from the mold. Abnormal problems occur and the product value is reduced, so that traces have been devised so as to be as inconspicuous as possible, and many requests for improvement have been issued. In conventional injection molded products, if the synthetic resin material used has a large shrinkage rate during molding, the release resistance is large, so it is known to install a plurality of ejection pins, that is, eject pins, for release. I have.

[0003]

However, if the case is a transparent or translucent case and the inside can be seen through, if there is a plurality of release marks of the eject pin in a portion where the medium can be seen, the appearance is poor and the appearance is poor. Deterioration often occurs, and the appearance or the shape of the product is greatly restricted, and if the release trace is a position that is inconspicuous in the product, that is, a rib corresponding to the center core on the bottom surface of the case, if the rib is thin, the rib may be too thin. There is a restriction that the eject pin can not be located at the projecting position and it must be found at another position.If the diameter of the center core diameter and the eject pin diameter are significantly different, the inside can be seen through, so the appearance is not noticeable, There was a problem in appearance, and there was a drawback that the commercial value was reduced. The present invention eliminates these conventional drawbacks, and does not leave a trace of the release pin of the release eject pin even in a transparent or translucent case in which the inside of the case can be seen through. An object of the present invention is to provide a disk cartridge having a high commercial value without a defect in appearance.

[0004]

According to the present invention, there is provided a case for accommodating a medium therein, wherein the case is formed of a transparent or translucent resin through which the inside can be seen. The center core hole formed on the bottom surface inside the case facing the insertion hole is used as the abutting surface for a single eject pin, and when the abutting surface is used, the eject pin diameter and the center core hole diameter are almost the same. It is a diameter.

[0005]

When the case is released from the mold for forming the case, the center core hole formed on the inner bottom surface of the case facing the drive shaft insertion hole of the case is formed to have a diameter substantially equal to that of the center core hole. By using the abutment surface for the eject pin, the moldability of the case is improved, and even in the case where the transparent inside can be seen through, the mask is masked by the inner shape of the center core hole and becomes less noticeable. It is indistinguishable and used without hindrance in appearance.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the example of a disk cartridge shown in FIGS. 1 to 4. A disk medium 2 as an information medium is accommodated in a case 1 and an opening 3 such as a head insertion hole is formed. A case 1 is slidably provided with a shutter 4 having a substantially U-shaped cross section for opening and closing the opening 3. The case 1 comprises an upper case and a lower case, and the case 1 is made of a transparent or translucent resin. Wherein the bottom surface of the center core hole 10 on the bottom surface of the upper case 1 facing the drive shaft insertion hole 16 of the lower case abuts against a single eject pin 11 for release. As a disk cartridge.

The center core hole 10 is surrounded by an annular rib 12 protruding from the inner surface of the case, and an abutting surface of the eject pin 11 having a diameter substantially equal to the inner peripheral diameter of the annular rib 12. That is, the eject pin diameter is set to be approximately the same as the diameter of the center core hole, and most of the bottom surface of the center core hole 10 is used as a working surface at the time of mold release.
Even in the case where the inside can be seen through, the position is inconspicuous even if a mold release mark is attached.

In this case, as shown in FIG. 5, a single mold release eject pin 11 is provided in a cavity of a molding die injection-molded with a transparent or translucent resin, and is housed in a case. A mold for forming a cartridge provided with an eject pin having substantially the same diameter as the diameter of the center core hole 10 on the bottom surface of the case facing the center core 6 of the medium to be used. The molding die includes a fixed die 13 and a movable die 14.
And a cavity 15 is formed from the opposite molds 13,
14, a parting surface is formed between the ejection pins 11
By an operating member to release the molded product.

In FIG. 1, reference numeral 5 denotes a shutter slide area, and reference numeral 6 denotes a center core, which is fixed to the disk-shaped medium 2. Reference numeral 7 denotes a drive shaft, 8 denotes a shutter lock member, 9 denotes a plug for preventing erasure, 17 denotes a medium storage portion, and 18 denotes a pattern portion. The case 1 is selected from various types of shells in the form of disk cartridges containing disk-shaped media such as floppy disks, compact disks, video disks, and optical disks.

[0010]

According to the present invention, there is provided a case for accommodating a medium therein, wherein the case is formed of a transparent or translucent resin. By forming the formed center core hole as an abutting surface for an eject pin having substantially the same diameter as the center core hole, even in a transparent case in which the inside can be seen through, traces of the release pin are masked in the inner surface shape and stand out. It becomes difficult to use, and it is used without hindrance in appearance, and it has a good flowability of resin even when molding the case, it is easy to mold, there is no molding failure, appearance appearance is good, and commercial value is enhanced. Has a practical effect.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a perspective view of the example of FIG. 1 in a separated state.

FIG. 3 is an enlarged plan view showing an inner surface of an upper case of the example of FIG. 1;

FIG. 4 is an enlarged vertical sectional view taken along line AA of the example of FIG.

FIG. 5 is a longitudinal sectional view of a molded state of the upper case of the example of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 case 2 disk-shaped medium 3 opening 4 shutter 5 shutter slide area 6 center core 10 center core hole 11 eject pin 12 annular rib 16 drive shaft insertion hole

Claims (1)

(57) [Claims] 1. A case for storing a medium therein, comprising:
In a disk cartridge in which the case is formed of a transparent or translucent resin, a center core hole formed on the inner bottom surface of the case facing the drive shaft insertion hole of the case has a diameter substantially equal to that of the center core hole. A disc cartridge having an eject pin abutting surface.