JPH08161847A - Disk cartridge - Google Patents

Abstract

PURPOSE: To improve the visibility in a case, to enhance an appearance grade and to intensify durability by embedding the insert lines formed of an insert for partition of metal molds for molding into the stepped part formed in the inside surface or outside surface of the case in an area contg. a gate for injection of a transparent resin in a see-through window part. CONSTITUTION: This disk cartridge is formed by rotatably housing a disk-shaped medium into the case 1 consisting of an upper case and a lower case. The disk cartridge is provided with the case integrally molded of an opaque resin forming the main part 3 of the case 1 and a transparent resin forming the see-through window part 4. The insert lines 7 formed of the insert 17 for partition of the metal molds for molding are embedded along the stepped part 6 formed in or out of the case in the area including the gate for injecting the transparent resin of the window part 4. In such a case, the embedment of the insert lines is applied to the upper case. The main part 3, shutter sliding area 8 and medium central part 9 of the outside shape parts are composed of the opaque resins and a part 10 nearly facing the medium recording surface is composed of the transparent resin. Both resins are integrally molded. A label sticking area 11 is formed to a recessed shape slightly deeper than the label thickness as compared with the other outside surfaces.

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 particular, an optical disk, a magneto-optical disk or the like, which is rotatably housed in a case.

[0002]

2. Description of the Related Art Generally, an information medium, for example, a disk-shaped medium such as a magnetic disk, an optical disk or a magneto-optical disk is used while being housed in a case. The case of the disk cartridge so far has been molded using only one type of transparent or opaque resin. Also, as a cassette case for other media,
For example, it is known that a transparent resin is integrally molded on a portion including an opaque resin and a window portion that constitutes the outside in a case of an audio cassette.

[0003]

Since the conventional disk cartridge case uses only a single resin,
When using an opaque resin, there is a problem that the design is monotonous and the form is similar even if the manufacturer is different, and it is difficult for the user to distinguish, and when using a transparent resin, there are few types of transparent resin, There is a problem that the optimum resin cannot be selected for the application, and because the entire surface is transparent, the internal structure can be seen from the front, so the design emphasizes the appearance and the manufacturing is complicated and the cost is high. . In addition, when integrally molding two types of resin, opaque and transparent, used in the case of audio cassettes, a transparent resin gate can be provided by using the hub hole and scale, so the appearance of gate marks However, in the case of the disk cartridge case, since there is no scale or hub hole, it is extremely difficult to make the gate mark that is a problem in appearance inconspicuous. Also, if the gate mold is configured as a bush of a separate member, it is easy to repair the mold against a mold accident, but since the bush line occurs in the transparent window of the case,
There was a problem that the appearance quality was degraded. The present invention is intended to eliminate these conventional drawbacks, and greatly improves the appearance quality of a case in which two kinds of resins are integrally molded in a disk cartridge that rotatably houses a disk-shaped medium inside. At the same time, it is to provide a structure that facilitates maintenance such as manufacturing and repair of a case molding die.

[0004]

SUMMARY OF THE INVENTION The present invention is a disk cartridge in which a disk-shaped medium is rotatably housed in a case consisting of an upper case and a lower case, and an opaque resin forming a main part of the case, A transparent resin forming a see-through window is integrally formed with the case, and the see-through window is an area including a transparent resin injecting gate, and a step of a molding die is formed on a step portion formed on the inner surface or the outer surface of the case. A nesting line formed by a nesting partition is provided alongside.

[0005]

The upper case integrally formed with the opaque resin forming the main part of the case and the transparent resin forming the see-through window is provided in the area including the transparent resin injection gate in the see-through window. Since the nesting line formed by the partitioning nest of the molding die is provided along the stepped portion formed on the inner surface or the outer surface, the visibility of the disk-shaped medium from the see-through window is easy in handling, and The pattern can be seen through and it has an aesthetic feeling,
The case can be given uniqueness without being monotonous in terms of design, its appearance is good and its appearance quality is improved,
Moreover, the strength of the joint portion of the different resin between the opaque portion and the transparent portion of the case does not decrease, and there is no molding defect, which prevents the case from being deformed by an external force and reduces the damage to the disk-shaped medium. In addition, it is possible to efficiently produce a highly reliable disc cartridge which can set a necessary plate thickness for the case and has sufficient strength.

[0006]

1 to 9, an embodiment of the present invention will be described. In a disk cartridge in which a disk-shaped medium 2 is rotatably housed in a case 1 composed of an upper case and a lower case, the case 1 is provided with a case integrally formed with an opaque resin forming the main portion 3 and a transparent resin forming the transparent window portion 4, and the transparent window portion 4 is an area including the transparent resin injecting gate 5. A nesting wire 7 formed of a partitioning nest 12 of a molding die is provided along a step portion 6 formed on the inner surface or the outer surface.

In this case, although applied to the upper case, the main part 3 of the outer shape part, the shutter sliding area 8 and the media center part 9 are made of an opaque resin, and the transparent resin substantially opposes the recording surface of the media. The part 10 is formed, and both resins are integrally molded. Also, the label attachment area 11
Is a little deeper than the label thickness compared to other outer surfaces,
The concave shape is provided so as to extend over a part of the medium central portion 9 and a portion 10 substantially facing the recording surface of the medium.

The opaque resin gate 15 is provided in the shutter sliding area 8, and the transparent resin gate 5 is provided.
Is provided in a portion which is substantially opposite to the recording surface of the medium and which is not the label attaching area 11. In order to prevent the resin from flowing into the portion formed of the transparent resin when the opaque resin is injection-molded in the arc-shaped area including the gate 5 of the transparent resin, that is, around the part of the see-through window portion. There is a step 6 due to the abutting part of the mold, and the nesting line 7 of the gate bush 12 of the mold including the gate 5 made of transparent resin is arranged in accordance with the step 6. Further, in the molding die, as shown in FIG. 7, a sliding core 14 that slides in a movable die 13 and forms a portion formed of transparent resin.
To provide. This sliding movable mold 14 moves forward as shown in FIG. 7B when injection molding an opaque resin, and moves to the fixed mold 16 at the boundary formed by the opaque resin and the transparent resin. The partition wall 17 is provided so as to come into contact with the opaque resin so as not to flow into the portion formed of the transparent resin. After that, in order to injection-mold the transparent resin, the sliding movable-side mold 14 is retracted to form a space, and a portion formed of the transparent resin is molded in that space [FIG. 7 (a)]. The same shape can be applied to the lower shell. In that case, to make the shape of the part formed of transparent resin almost the same as the upper shell,
In order to improve moldability, the resin is preferably an opaque resin (FIG. 8B).

As the nesting wire 7, the step portion 6
In addition to the above, along the boundary line between the opaque resin and the transparent resin, that is, near the connection boundary line between the case main portion 3 and the transparent window portion 4,
Consideration is given to improving the appearance quality. As shown in FIGS. 4 and 7, the disk cartridge mold is a movable mold 13 for forming a portion formed of transparent resin, and a sliding mold that slides on the movable mold 13. Dynamic core 1
4 and the gate bush 12 that is divided with respect to the fixed-side mold 16 and includes a gate for injecting the second resin in accordance with a step for partitioning the opaque resin provided on the sliding core 14. By using the structured one, the nesting line 7 is arranged in accordance with the step portion 6 partitioning the opaque resin on the inner peripheral surface of the transparent window portion 4 to eliminate unnecessary patterns in the window portion and improve the internal visibility. At the same time, since the gate portion 5 ₁ for injecting the resin with the molding die is a separate member from the die body, the gate portion 5 ₁ can be easily disassembled and the maintainability can be improved, and should the die be damaged, It is economical because it can be easily renewed and there are few repair parts.

By setting the depth of the concave label area 11 for label sticking formed on the surface of the case 1 and the depth of the concave portion of the gate 5 to be substantially equal to each other, the required thickness of the case 1 can be set. Care is taken to make a reliable and reliable disc cartridge with sufficient strength.

In the figure, 20 is a disk clamping plate, 21 is a fitting hole, 22 is a shutter, 23 is an erasure prevention plug, 25 is a shutter lock, 26 is a medium accommodating portion,
27 and 28 are openings.

[0012]

According to the present invention, in a disk cartridge in which a disk-shaped medium is rotatably housed in a case consisting of an upper case and a lower case, an opaque resin forming a main part of the case and a see-through window are provided. The transparent window to be formed is integrally molded with a case, the transparent window is an area including a transparent resin injecting gate, and a step is formed on an inner surface or an outer surface of the case with a molding die partitioning nest. By arranging the nesting lines that are formed, the visibility inside the case can be improved and the case can be made unique without being monotonous in terms of design, and its appearance is good and its appearance quality is good. In addition, the strength of the joint of different resin between the opaque part and the transparent part of the case does not decrease, and there is no molding defect. In conjunction also reduced the failure, it is possible to efficiently produce high disk cartridge reliable setting can strength is sufficient sheet thickness required in the case.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention in a separated state.

FIG. 2 is a plan view of the case of the example of FIG. 1, where (a) shows an upper case and (b) shows a lower case.

FIG. 3 is an enlarged vertical sectional view taken along the line AA of FIG.

4A and 4B are vertical cross-sectional views of a molding state of the example of FIG. 3, in which FIG. 4A shows a movable side mold retracted position, and FIG. 4B shows a movable side mold forward position.

FIG. 5 is an enlarged vertical sectional view taken along line BB of FIG.

6A and 6B are vertical cross-sectional views of the molding state of the example of FIG. 5, in which FIG. 6A shows a movable side mold retracted position, and FIG. 6B shows a movable side mold forward position.

FIG. 7 is a vertical cross-sectional view of the molding state taken along the line CC of FIG. 2A, in which FIG. 7A shows the movable side mold retracted position, and FIG.

8 is a plan view of the case of FIG. 2 in a separated state,
(A) shows an upper case and (b) shows a lower case.

FIG. 9 is an enlarged partially cutaway perspective view taken along the line D-D of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 case 2 disk medium 3 main part 4 see-through window part 5 gate part 6 step part 7 nesting line 8 shutter sliding area 9 media center part 10 media recording surface facing part 11 label area 12 gate bush 13 movable side mold 14 sliding Moving core 15 Gate 16 Fixed side mold 17 Nesting

Claims (2)

[Claims] 1. A disk cartridge in which a disk-shaped medium is rotatably housed in a case composed of an upper case and a lower case, and an opaque resin forming a main part of the case and a transparent resin forming a see-through window part. And a case formed integrally with the transparent window portion, and a nest formed by a partitioning die of a molding die at a step portion formed on the inner surface or the outer surface of the case in an area including a transparent resin injection gate in the transparent window portion. A disk cartridge characterized by lines. 2. The disk cartridge according to claim 1, wherein the nest line is provided near a boundary line between the opaque resin and the transparent resin.