JP3212139B2 - Resin container for tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin container for a tape cassette.

[0002]

2. Description of the Related Art For example, in an audio cassette tape, as shown in FIG. 7, a magnetic tape 2 wound around a pair of rotatable hubs 1 is a cassette 3 made of a resin container.
Is housed inside. The tape cassette 3 is generally composed of a pair of box-shaped resin containers, a cassette half 3a,
3b. This cassette half 3a,
3b, the side walls 5, 6, and 7 are bent almost vertically in the same direction from each side of the rectangular main plate portion 4 as the bottom wall. Also,
A bulging portion 8 is provided at the center of the front side of the main plate portion 4. In the bulging portion 8, a front tooth portion (not shown) for pressing the exposed portion of the tape is provided on the front side wall 5. Further, a pair of left and right hub receiving portions 10 for rotatably supporting the hub 1 is provided at the center of the main plate portion 4. Further, in the cassette tape, the tape winding diameter is generally made transparent from the outside. For this reason, in the conventional tape cassette 3 shown in FIG. A small transparent window 11 is provided at the position. However, with such a small transparent window 11, visibility is poor, and it is difficult to confirm the tape winding diameter. On the other hand, there is a conventional tape cassette 3 which is entirely transparent. However, in this case, unnecessary parts such as internal ribs and guide rollers can be seen and the appearance is not good. On the other hand, as shown in FIG. 8, there is a conventional tape cassette 3 in which a large transparent window 12 including both hub receiving portions 10 is provided in the main plate portion 4. However, a transparent window 12 provided only in the main plate portion 4 even if it is large to some extent as described above.
Then, it is difficult to see the tape winding diameter when viewed a little from an oblique direction. In the case of FIG.
However, there is a problem that many parts of the hub 1 are visible from the outside, and the appearance is impaired.

[0003]

As described above, in the conventional tape cassette, since the transparent window is provided only in the main plate portion, there is a problem that visibility is poor and it is difficult to confirm the tape winding diameter. On the other hand, conventionally, there is a tape cassette which is entirely transparent, but in this case, there is a problem that extra parts such as internal ribs and guide rollers can be seen and the appearance is not good.

On the other hand, Japanese Patent Application Laid-Open No. 60-61968 discloses a cassette half in which an opaque portion is provided with a transparent portion which extends from one side wall to the side wall facing the one side wall through the main plate portion. According to this configuration,
Although the visibility of the tape winding diameter can be increased while suppressing the deterioration of the appearance, the hub receiving portion (reel shaft insertion hole) is included in the transparent portion, so that the externally visible hub impairs the appearance as described above. There's a problem.

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and has a novel design and is capable of increasing the visibility of the tape winding diameter without deteriorating the appearance, and is made of resin for a tape cassette. It is intended to provide a container.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and the invention of claim 1 has a side wall bent from the periphery of the bottom wall to the same side, and a tape is wound around the bottom wall. In a resin container for a tape cassette having a pair of hub receiving portions on the bottom wall for rotatably supporting a hub,
The opaque portion has a transparent portion that is substantially continuous from the leading edge of one side wall to the leading edge of the side wall facing the one side wall through the bottom wall, and makes the hub receiving portion located in the transparent portion opaque. to have a directional extending these hub receiving portion in the lateral direction of the transparent portion of the position Chico on the back side of the transparent portion
The opaque portions on both sides of the transparent portion are integrally connected by a pair of opaque connecting portions.

[0007] The invention of claim 2 provides a pair of claim 1.
The tape-made resin container for a tape cassette described above is abutted at the leading edge of the side wall, and has a transparent portion extending over substantially the entire circumference across both sides.

[0008]

In the resin container for a tape cassette according to the first aspect of the present invention, the transparent portion substantially continuous from the leading edge of one side wall to the leading edge of the side wall facing the one side wall through the bottom wall is provided in the opaque portion. By providing this, the visibility of the tape winding diameter is increased without deteriorating the appearance, and by making the hub receiving part located in the transparent part opaque, it has a novel and high design and appearance. The external appearance of the cassette tape is enhanced by hiding the hub of the cassette tape as much as possible, and the hub receiving portion is provided on both sides of the transparent portion by a pair of opaque communication portions having a direction extending in the lateral direction of the transparent portion. it opaque part
Since they are integrally connected, the formability is not impaired, and the hub receiving part is opaque on both sides by the connecting part.
Since the shortest distance is connected to each bright part,
And set a gate on the part corresponding to the hub receiving part
Even if not present, resin is equivalent to the opaque parts on both sides
Of the hub receiving part.
And the hub receiving portion can be formed well. Further
To, by which is positioned on the back side of the transparent portion of the communicating portion, with the never noticeable steps or grooves between the contact portion and the transparent portion, becomes equal to the transparent portion in the texture of the surface contact portion, each
It pair is contact part against the hub receiving portion is short and ambiguous
Thus, excellent appearance can be obtained.

Further, according to a second aspect of the present invention, there is provided a resin container for a tape cassette in which a pair of the resin containers for a tape cassette according to the first aspect of the present invention abut against each other at the leading edge of the side wall and extend substantially over the entire circumference. By providing a transparent portion extending over the length of the tape, the visibility of the tape winding diameter is increased without deteriorating the appearance, and a novel and high design is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the resin container for a tape cassette according to the present invention will be described below with reference to the drawings. The resin container of this embodiment is a tape cassette 3 used for a cassette tape as shown in FIG. 1 and a pair of cassette halves 3a and 3b constituting the same. The cassette tape shown in FIG. 1 has the same configuration as that of the cassette tape shown in FIGS. 7 and 8 described above, and the corresponding parts are denoted by the same reference numerals and description thereof will be omitted. And FIG.
In the cassette halves 3a and 3b shown in FIG. 3, the transparent window 13 which is a transparent portion substantially penetrates the cassette halves 3a and 3b in the longitudinal direction. That is, the transparent window 13 is substantially continuous from the leading edge of the one side wall 7 in the left-right direction to the leading edge of the side wall 7 facing the one side wall 7 through the main plate portion 4. Then, a pair of cassette halves 3a, 3b
The tape cassette 3, which is joined by abutting the leading edges of the side walls 5, 6, 7 has a transparent window 13 extending over both cassette halves 3a, 3b over the entire circumference. Opposite sides of the transparent window 13 in the tape cassette 3 and the cassette halves 3a and 3b are opaque portions. Along with this, each cassette half 3
Both hub receiving portions 14a and 3b are also island-shaped opaque portions of the same color as the both sides of the transparent window 13. And the hub receiving part 14
Is located behind the transparent resin that forms the transparent window 13.
Short by manual contact portion 15 comprising a pair of opaque resin to have a directionality that extends in a direction, it is integrally connected to each opaque portion of both sides of the transparent window 13 of the.

Next, an example of a mold used for two-color molding of the cassette halves 3a and 3b will be described with reference to FIGS. The mold includes a fixed mold 21 and a movable mold 22 which move vertically in the figure to open and close. The fixed type
Reference numeral 21 denotes an outer surface of the box-shaped cassette halves 3a and 3b, and the movable die 22 forms an inner surface of the cassette halves 3a and 3b. The fixed mold 21 has a fixed body.
A movable cavity member 24 is incorporated in 23. On the other hand, the movable mold 22 has a movable core member 26 incorporated in a movable mold body 25. The movable cavity member 24 moves up and down with respect to the fixed mold body 23 by driving a hydraulic cylinder device or the like, and opens and closes with respect to the movable mold body 25. Of the cavities formed in the mold, the cassette half 3a, The portion corresponding to the transparent window 13 of the main plate portion 4 of 3b is closed. The two movable core members 26 move up and down with respect to the movable mold body 25 by driving a hydraulic cylinder device or the like, and open and close with respect to the movable cavity member 24. The portions corresponding to the transparent windows 13 on both side walls 7 of the halves 3a and 3b are respectively closed. And FIG.
5 (a) and FIG. 5 (a), the fixed mold 21 and the movable mold 22 are clamped, and the movable cavity member 24 is abutted against the movable mold body 25.
A primary cavity 27 is formed between the fixed mold 21 and the movable mold 22 in a state where the movable core member 26 is abutted against the movable core member 24.
After filling the primary side resin into the secondary side cavity 27, FIG.
As shown in FIG. 5B and FIG. 5B, the movable cavity member 24 is separated from the movable mold body 25, and the movable core member 26 is further separated from the movable cavity member 24, so that the fixed mold 21 and the movable mold 22 are separated. A secondary side cavity 28 is formed between the primary side resin P1 solidified in the primary side cavity 27. Further, the fixed type main body 23 includes:
A plurality of primary gates 29 each opening to the primary cavity 27 and a secondary gate 30 opening to the secondary cavity 28 are formed. The primary gate 29
Is a tunnel gate that opens from the sub-runner 31 formed between the fixed die main body 23 and the movable die main body 25 during mold clamping to a position corresponding to the front tooth portion 9, the side wall 6, or the side wall 7 of the side wall 5. . On the other hand, the secondary gate 30 also opens from the same sub-runner 32 to a position corresponding to the transparent window 13 on the side wall 7.

Next, two-color molding using the mold will be described. When forming the tape cassette halves 3a and 3b, first, as shown in FIGS. 4 (a) and 5 (a),
The fixed mold 21 and the movable mold 22 are clamped, and the movable cavity member 24 is abutted against the movable mold body 25, and the movable core member 26 is abutted against the movable cavity member 24. In this state, the secondary side cavity 28 corresponding to the transparent window 13 is closed by the movable cavity member 24 and the movable core member 26, and the primary side cavity 27 is formed between the fixed mold 21 and the movable mold 22. You. Then, an opaque primary resin P1 is injected into the primary cavity 27 from the primary gate 29 and filled.
The primary resin P1 flows into a portion of the primary cavity 27 corresponding to the hub receiving portion 14 via a portion corresponding to the communication portion 15. In this way, portions of the cassette halves 3a and 3b other than the transparent window 13 including the hub receiving portion 14 are formed. Next, after the primary resin P1 filled in the primary cavity 27 is solidified, as shown in FIGS. 4 (b) and 5 (b), the movable cavity member
24 is raised as shown by arrow A by the thickness of the main plate portion 4, and the movable core member 26 is lowered with respect to the movable cavity member 24 by the height of the side wall 7 as shown by arrow B. In this state, a secondary cavity 28 having the shape of the transparent window 13 is formed between the fixed mold 21, the movable mold 22, and the primary resin P1 solidified in the primary cavity 27. The pin 26 remains in contact with the fixed mold 21. Then, a transparent secondary resin P2 is injected and filled into the secondary cavity 28 from the secondary gate 30. This allows transparent windows
Form 13 Then, after the secondary resin P2 filled in the secondary cavity 28 is solidified, the fixed mold 21 and the movable mold 22 are opened to release the molded tape cassette halves 3a and 3b. , Take out.

In this manner, cassette halves 3a and 3b having a transparent window 13 extending from one side wall 7 to the other side wall 7 substantially through the main plate portion 4 as shown in FIG. 1 can be formed in two colors. This allows
The tape cassette 3 having the transparent window 13 over almost the entire circumference can be obtained. As described above, the tape cassette 3 having the transparent window 13 over the entire circumference is excellent in the visibility of the tape winding diameter, so that the tape winding diameter can be easily increased even in a dark place such as in a car or when viewed obliquely. And it can be surely confirmed. At the same time, unnecessary things such as internal ribs and guide rollers are not visible, and the appearance is good. Also, the opaque hub receiver 14
As a result, the hub 1 that deteriorates the appearance is also hidden to some extent. Moreover, the design of the transparent window 13 and hub receiving part 14 is novel,
High visual appeal. In addition, if the hub receiving part
Assuming that 14 is separated from the opaque portions on both sides of the transparent window 13, the number of gates must be increased during molding,
Although the formability is impaired, the hub receiving portion 14 is connected to the opaque portions on both sides of the transparent window 13 by the connecting portion 15, so that the formability is not impaired. Moreover, each hub receiving part 14 is a pair of connecting parts 15
Connected to the opaque parts on both sides of the transparent window 13
And the connecting part 15 extends in the short direction of the transparent window 13.
By having directivity, that is, the hub receiving portion 14 is
Since it is connected to the opaque part over a short distance,
The primary resin P1 corresponds to the opaque parts on both sides
Satisfactorily flows into a portion corresponding to the hub receiving portion 14. I
Therefore, these hub receiving portions 14 can be formed well. Sa
In addition, since the communication unit 15 is located behind the transparent window 13,
Steps and grooves between the connecting portion 15 and the transparent window 13 are not noticeable, and the texture of the surface is the same as that of the transparent window 13 at the connecting portion 15, and a pair of connecting portions 15 is provided for each hub receiving portion 14. Is transparent
Direction extending in the lateral direction of the light window 13 and shortened
Combined with this, an even better appearance can be obtained.

FIG. 6 shows another embodiment of the present invention.
The cassette halves 3a and 3b of this embodiment have two layers of an opaque primary resin P1 and a transparent secondary resin P2 on both sides of a transparent window 13.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
The configuration of the mold for molding the cassette halves 3a and 3b in two colors is not limited to that of the above embodiment.

[0016]

According to the first aspect of the present invention, the resin container for a tape cassette has a transparent portion which is substantially continuous from the leading edge of one side wall to the leading edge of the side wall facing the one side wall through the bottom wall in the opaque portion. The hub receiving portion located in the transparent portion is made opaque, and the hub receiving portion is located on the back side of the transparent portion and extends in the lateral direction of the transparent portion.
Are those which lead to, respectively integral with the opaque portion of both sides of the transparent portion by a pair of opaque contact portion to have a sex, without deteriorating the appearance, it is possible to enhance the visibility of the tape winding diameter, a novel High design is obtained, and the opaque hub receiving part can hide the hub of the cassette tape that damages the appearance as much as possible.
It can prevent moldability from being impaired, and the communication part
The hub receiving parts are located on the opaque parts on both sides
It is connected to the hub receiving part when molding.
Even if the gate is not provided in the corresponding part, resin
From the parts corresponding to the opaque parts on both sides to the hub receiving part
It can flow well into the corresponding part, and
The part can be formed well. Furthermore, by arranging the connecting part on the back side of the transparent part, the step and the groove between the connecting part and the transparent part can be made inconspicuous, and the texture of the surface can be made the same as the transparent part in the connecting part, For each hub receiver
Combined with the short length of the pair of connecting portions, an even better appearance can be obtained.

Further, a resin container for a tape cassette according to the second aspect of the present invention comprises a pair of the resin containers for a tape cassette according to the first aspect of the present invention butted together at the leading edge of the side wall, and extends over the entire circumference. With a transparent portion that extends over the entire length, the visibility of the tape winding diameter can be increased without deteriorating the appearance,
It has a novel and high design.

[Brief description of the drawings]

FIG. 1 is a perspective view of an entire cassette tape showing one embodiment of a resin container for a tape cassette of the present invention.

FIG. 2 is a sectional view along a longitudinal direction of a tape cassette half, which is a resin container for the tape cassette.

FIG. 3 is a cross-sectional view of the tape cassette half taken along a lateral direction.

FIG. 4 is a cross-sectional view along the longitudinal direction of the cassette half showing an example of a two-color molding die of the tape cassette half;
(A) shows the time of forming the primary side cavity, and (b) shows the time of forming the secondary side cavity.

5A and 5B are cross-sectional views of the same cassette half along the lateral direction, where FIG. 5A shows a state when a primary cavity is formed, and FIG. 5B shows a state when a secondary cavity is formed.

FIG. 6 is a partial cross-sectional view of a cassette half showing another embodiment of the present invention.

FIG. 7 is a perspective view showing an example of a conventional cassette tape.

FIG. 8 is a perspective view showing another example of a conventional cassette tape.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hub 2 Tape 3 Tape cassette (Resin container for tape cassette) 3a, 3b Tape cassette half (Resin container for tape cassette) 4 Main plate part (bottom wall) 5 Side wall 6 Side wall 7 Side wall 13 Transparent window (Transparent part) 14 Hub receiving section 15 Communication section

Continuation of the front page (72) Inventor Hisanori Tanabe 3-1, Koganecho, Niigata City, Niigata Pref. Niigata Works, Mitsubishi Materials Corporation (56) References (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 23/687 G11B 23/113 B29C 45/16

Claims (2)

(57) [Claims] 1. A resin container for a tape cassette having a pair of hub receiving portions on the bottom wall, the side walls having a side wall bent from the periphery of the bottom wall to the same side and rotatably supporting a hub on which the tape is wound. An opaque portion having a transparent portion substantially continuous from a leading edge of one side wall to a leading edge of a side wall facing the one side wall through the bottom wall, and the hub receiving portion located in the transparent portion is opaque. And these hub receiving portions are located on the back side of the transparent portion.
A pair of tape cassette resin container, characterized in that by connecting together the respective opaque portion of both sides of the transparent portion by opaque contact portion to have a directional extending direction. 2. A tape cassette comprising a pair of resin containers for a tape cassette according to claim 1 butted together at the leading edge of a side wall, and having a transparent portion extending substantially over the entire circumference across the two containers. For plastic containers.