JP2911377B2 - 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 disk-shaped medium, in particular, an optical disk or a magneto-optical disk is rotatably housed in a case.

[0002]

2. Description of the Related Art Generally, a conventional disk cartridge case is formed using only one kind of transparent or opaque resin. As another cassette case for a medium, for example, it is known that a transparent resin is integrally formed in a portion of an audio cassette case including an opaque resin and a window, which constitutes the outside.

[0003]

Since the conventional disk cartridge case uses only a single resin,
When an opaque resin is used, the design is monotonous and the shape is similar even if the manufacturer is different, and there is a problem that it is difficult for the user to distinguish it.In addition, when a transparent resin is used, there are few types of transparent resin. The problem is that the most suitable resin for the application cannot be selected, and the entire structure is transparent, so the internal structure can be seen from the front. is there. Further, in the integral molding of two kinds of resins used in the case of the audio cassette, even if the concave portion for sticking the label is formed in the main portion made of the opaque resin, the concave portion is formed of the transparent resin at the boundary of the concave portion. Window was not provided. However, in the case of a disk cartridge and a cassette having a small size, there is a disadvantage that the amount of the label can be reduced unless the label size is relatively large compared to the surface area of the cassette case. The present invention seeks to eliminate these conventional disadvantages,
A label sticking recess formed in a case for rotatably storing a disk-shaped medium is provided including at least a main part formed of an opaque resin, and at least a part of a boundary portion of the label sticking recess is transparent. In contact with the window,
At the boundary, by configuring the transparent window portion to be a convex flat surface with respect to the label attachment concave portion, both the window portion and the label attachment region are relatively large, and the visibility is improved, An object of the present invention is to provide a disk cartridge that facilitates writing on a label.

[0004]

According to the present invention, there is provided a disk cartridge in which a case for rotatably storing a disk-shaped medium is provided with a concave label area for sticking a label on the surface of the case. The main part of the case and a transparent window formed of a transparent resin are integrally formed, and at least a part of the label area is formed of an opaque resin connected to the main part of the case. At the boundary in contact with the transparent window, the transparent window is formed as a convex flat surface with a step relative to the label area surface.

[0005]

The case has a case main part formed of an opaque resin and a transparent window formed of a transparent resin formed integrally with each other. At least a part thereof is formed, and since the transparent window portion is formed in a convex flat surface with a level difference with respect to the label area surface at the boundary contacting the transparent window portion, the handling of the disc-shaped medium from the transparent window portion in handling is performed. Easy visibility, rainbow pattern on the disc-shaped medium can be seen through, it has aesthetic effect, it has a design effect, it has good appearance and its appearance quality is enhanced, and the size of the transparent window is also label. The size of the area can be made large, and it is used as a disk cartridge with excellent writing characteristics.

[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.
And a disk-shaped medium 1 as an information medium
0 is rotatably housed, and a shutter 4 having a substantially U-shaped cross section for opening and closing the opening 3 is provided in a shutter sliding area 5 which is one step lower than the outer surface of the case. In a disk cartridge provided slidably and having a concave label area 25 for sticking a label on the surface of the upper case 1, the upper case 1 is made of an opaque resin, And at least a part of the label area 25 is formed of an opaque resin by being connected to the case main part 6, and at a boundary contacting the transparent window 7. A transparent window is formed on the convex flat surface 17 having a step with respect to the plane of the label area 25.

The shutter sliding region 5 is formed of an opaque resin portion and a transparent resin portion, and is formed continuously with the opaque resin portion and the transparent resin portion of the label area 25. The shutter sliding area 5
And a case portion facing the disc-shaped medium 10 is formed in the transparent window portion 7. In this case, the transparent window portion 7 made of a transparent resin is formed in an annular shape in an area other than the outermost periphery and the central portion of the disk-shaped medium 10, and furthermore, the concave flat surface of the label area 25 and the transparent window portion The transparent window 7 is formed by making the depth of the concave portion 27 of the molding gate portion equal or equal to the depth of the concave portion 27 of the gate portion.

In a disk cartridge molding die composed of a fixed die 8 for integrally molding a disk cartridge case with an opaque resin and a transparent or translucent resin, and a movable die 9, the transparent resin In the shutter sliding area 5 formed by the above, the sliding core that slides with respect to the movable mold 9 is the first sliding core 11 corresponding to the shutter sliding area 5 and the first sliding core 11 corresponding to the other parts. 2 sliding core 1
2 is used, and the thickness required for the case can be set even at a portion formed of a transparent resin with different sliding amounts.

The upper case 1 comprises a case main part 6, a shutter sliding area 5, and a central part of the medium made of an opaque resin, and a transparent window part 7 substantially facing the recording surface of the medium made of a transparent resin. Resin is integrally molded. In addition, the label area 25 for sticking the label is formed in a concave shape by an amount slightly deeper than the thickness of the label as compared with the other outer surfaces, and is provided so as to extend over a part of the medium that is substantially opposed to the recording surface of the medium. . Then, the gate recess 26 of the opaque resin
It is provided to the shutter sliding area 5, a gate recess 27 formed from the gate portion 27 ₁ of the transparent resin, the label area 25 convex plane 17 of the transparent window portion 7 substantially facing the recording surface of the medium Install in places that do not have. In addition, around the arc-shaped region including the gate recess 27 of the transparent resin, a die abutment for preventing the resin from flowing into the portion formed of the transparent resin when the opaque resin is injection-molded. There is a step due to the portion 28. To fit the stepped portion, so as to place the nest line 30 of the gate bush 29 of the mold including a gate portion 27 ₁ of the bush 19 and the transparent resin.
The transparent portion formed of the transparent resin includes a part of the shutter sliding region 5, and the other portions formed of the transparent resin have a continuous shape.
This is because the continuous shape has an advantage that the gate into which the resin is injected can be provided at one place.

In order to form such a structure, in the mold used for molding, as shown in FIG. 5, when molding an opaque resin, the movable mold 9 moves forward and comes into contact with the fixed mold 8. When molding the transparent resin, at the boundary of the concave portion of the label area 25 of the sliding movable mold 9 that retracts to secure a space for the transparent resin, the sliding movable mold 9 is A convex portion for forming a label sticking concave portion formed on the fixed mold and a slope contacting a slope of a step at a boundary portion with a main surface forming another outer surface are provided, and the top of the slope is provided. , Which is located inside the convex portion of the fixed mold (FIG. 7).

In the case of the disk cartridge of the embodiment, the thickness of the main portion is 1 mm, and the thickness of the shutter sliding area 5 is about 0.65 mm. The thickness of the label area 25 in a part of the case main part 6 is about 0.8 mm. Therefore, the sliding movable mold at the portion formed of the transparent resin is divided into two sliding cores 11 and 12, and the sliding movable mold 9 at the portion forming the case main part 6 and the label area 25 is formed. And the sliding core 11 forming the shutter sliding area 5. The movable mold 9 that slides has a sliding amount of about 0.8 mm, and the sliding core 11 has a sliding amount of about 0.6 mm.
5 mm. It is preferable that the thickness of the main surface portion is reduced by 0.2 mm except for the outer peripheral portion of the movable mold 9 that slides and the label area 25 so that the plate thickness becomes approximately 1 mm. Further, in the label area 25, a portion corresponding to the center of the disc is formed of an opaque resin [FIG.
(A)] or a two-layered form of an opaque resin and a transparent resin (FIG. 9 (b)), which can give specificity without being monotonous in design and enhance appearance quality, and furthermore, a case. The joint portion of the different resin between the opaque portion and the transparent portion is not deteriorated in strength, has no molding failure, prevents the case from being deformed by an external force, and prevents the disk-shaped medium from being damaged. Further, the same shape can be applied to the lower case 2. In that case, it is desirable to make the shape of the portion formed of the transparent resin substantially the same as that of the upper case 1 in order to improve moldability.

In the drawing, reference numeral 20 denotes a disk clamping plate, 21 is a fitting hole, 22 is an erasure prevention plug, 23 is a shutter lock, 24 is a medium storage section, 25 is a label area, and 26 and 27 are gate recesses. is there.

The shutter 4 is a metal or synthetic resin shutter. A sliding guide protruding from the side of the case to the inside thereof has a reinforcing portion corresponding to or fitted to a recess formed in the case. In consideration of this, it is considered that the strength of the shutter is increased and the reliability is improved.

[0014]

According to the present invention, there is provided a disk cartridge for rotatably storing a disk-shaped medium in a case.
The case is integrally molded with an opaque resin forming a main part of the case and a transparent resin forming a transparent window,
The label sticking concave flat portion is provided including at least a main portion formed of an opaque resin, at least a part of a boundary portion of the label sticking concave surface portion is in contact with the transparent window portion, At the boundary, the transparent window portion is configured to be a convex flat surface relative to the concave surface for label attachment, so that the outside of the concave portion for label attachment is a window portion having substantially the same height as the main surface one step higher. Because the size of the window and the size of the concave portion for attaching the label can be made large, the visibility is good, and the size of the label can be made large, so that the writing is excellent and the appearance quality as a design form is also high. It is possible to make the disk cartridge high in appearance and good in appearance.

[Brief description of the drawings]

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

FIGS. 2A and 2B are plan views of the case of the example of FIG. 1, wherein FIG. 2A shows an upper case and FIG.

FIG. 3 is a plan view showing a separated state of a molded portion of a case;
(A) shows an upper case and (b) shows a lower case.

FIG. 4 is an enlarged vertical sectional view taken along line AA of FIG. 2;

FIG. 5 is a vertical cross-sectional view of the example of FIG. 4 when forming a gate portion;
(A) shows the mold retreat position, and (b) shows the mold advance position.

FIG. 6 is an enlarged vertical sectional view taken along line BB of FIG. 2;

7A and 7B are longitudinal sectional views of the example of FIG. 6 during molding, wherein FIG. 7A shows a mold retreat position and FIG. 7B shows a mold advance position.

8A is an enlarged longitudinal sectional view taken along line CC of the example of FIG. 2, FIG. 8B shows a mold retreat position during molding, and FIG. 8C shows a mold advance position during molding.

9 (a) is an enlarged partial cutaway perspective view taken along line DD of the example of FIG. 2, and FIG. 9 (b) shows another example of the same part as FIG. 9 (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Opening 4 Shutter 5 Shutter sliding area 6 Case main part 7 Transparent window 8 Fixed mold 9 Movable mold 10 Disk-shaped medium 11 First sliding core 12 Second sliding core 19 Bush 20 Clamping plate 25 Label area 26 Gate recess 27 Gate recess

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 23/38 G11B 23/03 604

Claims (5)

(57) [Claims] 1. A disk cartridge comprising a case for rotatably storing a disk-shaped medium and a concave label area for sticking a label on a surface of the case, wherein the case is formed of an opaque resin, and a transparent resin. And a transparent window portion formed at the same time, and at least a part of the label area is formed of an opaque resin by being connected to the main portion of the case, and at a boundary in contact with the transparent window portion, a label area surface is formed. A disc cartridge characterized in that a transparent window is formed on a convex flat surface with a step. 2. A shutter for opening and closing an opening into which a recording / reproducing head or the like can be inserted is slidably provided in a shutter sliding region one step lower than the surface of the case, and the shutter sliding region is formed of an opaque resin portion and a transparent member. 2. The disc cartridge according to claim 1, wherein the disc cartridge is formed of a resin portion and is formed continuously with the opaque resin portion and the transparent resin portion of the label area. 3. An upper case comprising an opaque resin,
3. The disk cartridge according to claim 1, wherein the case is formed integrally with a transparent or translucent resin, and a case portion including at least a part of the shutter sliding area and facing the disk medium is formed in a transparent window portion. . 4. A disc cartridge provided with a concave label area for sticking a label on a surface of a case for rotatably storing a disc-shaped medium, wherein the case is formed of an opaque resin, A transparent window formed of a transparent resin is integrally molded, and at least a part of the label area is formed of an opaque resin connected to the main part of the case. A disc cartridge wherein a transparent window is formed by making the depth of the recess of the gate for forming a transparent window equal or equal to the depth of the recess of the gate. 5. A disc cartridge having a concave surface label area for sticking a label on a surface of a case for rotatably storing a disk-shaped medium, wherein the case is formed of an opaque resin, A transparent window formed of the transparent resin, wherein a transparent window formed of a transparent resin is integrally formed, and at least a part of the label area is formed of an opaque resin connected to the main part of the case. A disk cartridge characterized in that the portion is formed annularly in a region other than the outermost periphery and the central portion of the disk-shaped medium.