JPH08207978A - Disc-holding case and its mold construction - Google Patents

Abstract

PURPOSE: To ensure the flawlessness of molded items when they are released from molds, avoid the spoilage in appearance due to marks of ejectros and cut down costs by reducing the number of parts. CONSTITUTION: A disc case consists of a base plate 12 and a cover plate 3 swingably attached along a side edge of the base plate 12, and a disc holder 13 is provided on the inner face of the base plate 12. The disc holder 13 has an insert part consisting of two or more protrusions 13a that are elastically deformable in the radial direction, arranged along the circumference at intervals and can be fitted into a through-hole 11a of a disc 11, and a holding part with a diameter larger than the through-hole 11a. A recessed part 16 whose inner diameter is reduced toward the open end and ring-like ejector marks 18 formed around the recessed part 16 are provided at the central part on the outer face of the base plate 12, so that ejector marks are prevented from growing into deep press marks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk housing case for housing a disk body such as a compact disk and a die structure for manufacturing the disk housing case.

[0002]

2. Description of the Related Art Conventionally, as a disc storage case for storing a disc body such as a compact disc, one having a structure shown in FIG. 8 is known. The disc storage case 1 is composed of a base plate 2, a cover plate 3 which is attached to one side of the base plate 2 so as to be openable and closable, and a tray 4 which is attached inside the base plate 2 in a stored state.

The base plate 2 has a base plate portion 2a having a rectangular shape in plan view and front, rear, left and right side walls 2b vertically raised from respective sides of the base plate portion 2a, and is formed in a shallow rectangular box shape. ing. When taking out a compact disc (not shown) from the left and right side walls 2b of the base plate 2, a finger hooking notch 2c for hooking a finger on the peripheral edge of the compact disc and a cover plate when the cover plate 3 is closed. Lyric card 5 protruding on 3
The lyric card retainer 3a for accommodating the lyric card retainer 3a, the notch 2d for accommodating the lyric card retainer, the tray attaching hole 2e for attaching the tray 4, and the support shaft 3b formed on the cover plate 3 are rotatably fitted. Bearing holes 2f for fitting are provided respectively.

Further, the tray 4 is fitted in a circular through hole provided in the central portion of the compact disc at the substantially central portion of the substrate portion 4a having a rectangular shape in plan view, and the compact disc is detachably held. It has a disk holding portion 6 for operating. The disc holding portion 6 includes a circular pedestal portion 6a,
It is composed of a plurality of hook-shaped projections 6b protruding from the pedestal portion 6a and arranged on the circumference at intervals.

That is, the disc holding portion 6 has a fitting portion 6c which is fitted into a through hole of a compact disc on a cylindrical outer peripheral surface formed by an array of a plurality of protrusions 6b.
And a holding portion 6d having a diameter larger than that of the through hole is provided on the tip side of the fitting portion 6c. When the compact disc is mounted on the disc holding portion 6, the projection 6b is elastically deformed inward in the radial direction by the through hole of the compact disc, and the holding portion 6d is reduced in diameter and inserted into the through hole. As a result, the through hole of the compact disc is fitted into the fitting portion 6c of the disc holding portion 6.
, The holding portion 6d is expanded in diameter and the compact disc is held so as not to fall out toward the tip of the disc holding portion 6.

[0006]

By the way, in the disk storage case 1, the shape of parts, the number of parts, and the like can be simplified for the purpose of further cost reduction. It is also considered to integrally form the tray 4 used to hold the compact disc 5 and the base plate 2 that houses the tray 4 as described above. In this case, basically, the tray 4
By providing the disk holding portion 6 provided in the central portion of the base plate 2, the base plate 2 and the tray 4 are integrated and the number of parts is reduced, so that the above object can be achieved.

However, since the disc holding portion 6 has a shape having the holding portion 6d on the tip side as described above, that is, a shape in which the diameter increases toward the tip, the base plate 2 has an undercut. It becomes a molded body. Then, various methods have been proposed as a method of releasing the molded body having such an undercut from the mold,
The simplest method is a method of pushing a molded body with an ejector pin and peeling it off from the mold when the mold is opened.

However, in this case, a considerable pressure that overcomes the fastening force by the undercut must be applied to the ejector pin, and the ejector mark is clearly formed on the base plate 2 as a deep impression, resulting in a product. The inconvenience that the value decreases may be considered.

In particular, when the entire base plate 2 is molded from a transparent resin material, compact discs and other patterns in the disc storage case 1 which can be seen through the base plate 2 are formed by ejector pins. It will be distorted by the ejector marks. Therefore, in this case, an inconvenience that the aesthetic appearance of the design is impaired can be considered.

Further, when the molded body having the undercut as described above is released from the mold by simply pushing it by the ejector pin, an external force acts on the molded body in a state of being restrained by the mold. It will be. For this reason, excessive stress may concentrate on the undercut portion of the molded body, and the undercut portion may be scraped off by the mold.

The present invention has been made in view of the above-mentioned circumstances, and ensures the soundness of the molded body at the time of releasing from the mold, and the loss of the appearance of the design due to the ejector mark of the ejector pin. It is an object of the present invention to provide a disk storage case and a mold structure for the disk storage case, which can be avoided while reducing the number of parts to reduce the cost.

[0012]

In order to achieve the above object, the present invention is a disk storage case for removably storing a disk body having a through hole in the center thereof, which is formed in a rectangular shape in plan view. A base plate capable of accommodating a disc inside the plate-like body, and a cover plate swingably attached to one side of the base plate and opened and closed with respect to the base plate. A plurality of protrusions that are projecting and arranged at intervals on the circumference and are elastically deformable in the radial direction, and a fitting portion that can be fitted into the through hole of the disk body on the outer peripheral surface thereof and the tip end side thereof Is provided with a disc holding portion having a holding portion having a diameter larger than that of the through hole, the outer surface of the base plate is recessed in the central portion and the inner peripheral surface is at the opening end. Only a recess reduced in diameter, have proposed disk storage case and a ring-shaped ejector mark formed around the concave portion is provided. In the above disk storage case, it is effective if the base plate is made of a transparent resin material.

Further, according to the present invention, a plurality of elastically deformable projections projecting from the central portion of the inner surface of the plate-like body having a rectangular shape in plan view and arranged at intervals on the circumference are enlarged toward the tip end. A mold structure for a disk storage case, which has a disk holding portion, and has a concave portion whose inner peripheral surface is reduced in diameter toward the opening end in the central portion of the outer surface of the plate-like body. A fixed side mold member for molding the inner surface side of the body,
A movable side mold member which is provided so as to be able to come into contact with and separate from the fixed side mold member and molds an outer surface side of the molded body, and the movable side mold member is molded with an inner surface of the disk holding portion. Columnar core pin, a cylindrical sleeve pin that is slidably fitted on the outer surface of the core pin in the mold opening direction to form the inner peripheral surface of the recess, and slidable on the outer surface of the sleeve pin in the mold opening direction. And a cylindrical ejector sleeve that is fitted over the outer peripheral surface of the concave portion and presses the periphery of the concave portion over the entire circumference when the molded body is released from the mold, and is provided between the movable die member and the sleeve pin. An urging means for urging the sleeve pin toward the fixed-side mold member to dispose the sleeve pin integrally with the ejector pin regardless of the displacement of the movable-side mold member;
A mold structure for a disk storage case is proposed, in which a molded body is released from the movable mold member excluding the sleeve pin, and stopper means for locking the sleeve pin to the movable mold member is provided. ing.

[0014]

According to the disc storage case of the present invention, the cover plate is swingably opened with respect to the base plate, and the disc holding portion on the inner surface of the base plate is fitted into the disc holding portion to form the disc holding portion. The protrusion is elastically deformed in the radial direction to reduce the diameter of the holding portion. Then, when the through hole of the disc body is fitted to the fitting portion, the elastic deformation of the projection is restored and the holding portion expands in diameter than the through hole. It is held in the attached state by the base plate so as not to fall off to the tip side of the part. Then, by swinging the cover plate with respect to the base plate and closing the cover plate, the disc body is housed inside the base plate and the cover plate.

In the base plate constituting such a disk storage case, the recess provided on the outer surface is formed so that the inner peripheral surface is reduced in diameter toward the opening end, so that the inner peripheral surface of the recess is undercut. It is formed. That is,
At the time of molding, it is held without being released from the mold by the undercut of the inner peripheral surface of the recess. The peripheral edge of the recess is projected by an ejector sleeve that forms a ring-shaped ejector mark, and uniform pressure is applied over the entire circumference, so that excessive local pressure is prevented from acting. , Will be released from the mold.

Therefore, according to this disk storage case, a locally deep ejector mark such as that formed by the ejector pin does not occur inside the plate-like body having a rectangular shape in plan view. Moreover, since the ejector mark itself is placed as part of the design of the disc storage case,
This prevents the aesthetic appearance of the design from being impaired as in the case of using ejector pins.

Further, in the above disk storage case,
If the base plate is made of a transparent resin material, a ring-shaped ejector mark is provided in the central portion, so that the disc body that penetrates the plate-like body as in the case of the ejector pin is formed. It is possible to avoid the inconvenience such as the distortion of the pattern.

Further, according to the mold structure of the disk storage case according to the present invention, the fixed side mold member for molding the inner surface side of the molded body and the movable side mold member for molding the outer surface side of the molded body are molded. By injecting the molten resin in the tightened state, a molded body is molded between the two. In order to release the molded body molded in this way from both mold members, first, the core pin molding the inner surface of the disk holding portion is displaced in the mold opening direction. As a result, the plurality of protrusions forming the disc holding portion are elastically deformable radially inward.

In this state, the movable mold member is separated from the fixed mold member. At this time, the molded body is attached to the movable side mold by the undercut of the inner peripheral surface of the recess formed on the outer surface of the molded body. The mold is released from the fixed-side mold member while being displaced inward, and the fixed-side mold is removed from the undercut formed by the holding portion of the disc holding portion.

Next, the movable mold member is displaced and the ejector sleeve is projected toward the molded body,
The molded body is released from the stationary mold member. In this case, the sleeve pin forming the inner peripheral surface of the recess is urged toward the fixed-side mold member by the operation of the urging means and is arranged integrally with the ejector sleeve. Therefore, when the free deformation of the molded body is limited by the movable-side mold member, an unreasonable force for releasing the undercut of the inner peripheral surface of the recess from the movable-side mold member does not act.

Then, when the molded body is released from the movable side mold member except for the bonded portion between the sleeve pin and the inner peripheral surface of the recess, the stopper means is actuated to move the sleeve pin to the movable side mold member. It is locked, and thereafter, it is displaced integrally with the movable mold member. As a result, the sleeve pin tends to be released from the undercut on the inner peripheral surface of the recess. In this state, the molded body is allowed to freely deform at most positions, so that the molded body removes the sleeve pin from the undercut on the inner peripheral surface of the recess so as to follow the pulling force of the sleeve pin. Is transformed into.

With this, it is possible to prevent excessive stress from being generated in the undercut of the inner peripheral surface of the recess by pulling out the sleeve pin, and it is possible to prevent such a portion from being scraped off by the sleeve pin. As a result, the molded body is completely released from the mold member in a sound state.

In this case, the ejector sleeve uniformly presses the molded body with a wide pressing area over the entire circumference of the peripheral edge of the recess. Therefore, the formation of locally deep ejector marks is avoided.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk storage case and its die structure according to the present invention will be described below with reference to the drawings. In the present embodiment, the same reference numerals are given to the portions having the same configurations as those of the above-described conventional disk storage case, and the description will be simplified.

The disk storage case 10 according to this embodiment.
Also, for example, it is a storage case for the compact disc 11, and as shown in FIG. 1, it is composed of a base plate 12 and a cover plate 3 which is swingably attached to the base plate 12.

The base plate 12 and the cover plate 3 are plate-like members 12a and 3a formed in a rectangular shape in plan view by injection-molding a transparent resin material, and have a low peripheral wall 12b. By forming 3b, each is formed in a shallow box shape. The plates 12 and 3 are configured so as to be swingably attached to their respective sides to form a box-shaped disc storage case 10 that can be opened and closed.

The base plate 12 has a disc holding portion 13 at the center thereof for holding the compact disc 11 to be housed therein. The disk holding portion 13 is the same as that provided in the conventional tray 4, and as shown in FIG. 1, a plurality of projections 13a projecting from the inner surface 12c of the base plate 12 are circumferentially spaced. It is configured by being arranged on the circumference.

As shown in FIG. 2, each protrusion 13a is substantially L-shaped.
The disk-shaped holding member 13 is formed in a hook shape, and the surface forming the outer peripheral surface of the disk holding portion 13 is inclined so that the diameter gradually increases from the plate-shaped body 12a toward the tip. This allows
A fitting portion 13b having an outer size that fits into the through hole 11a of the compact disk 11 without a gap is provided at the base of the disk holding portion 13, and is located on the tip side of the fitting portion 13b. Is provided with a holding portion 13c having an outer diameter larger than that of the through hole 11a.

The protrusions 13a are arranged at intervals in the circumferential direction as described above, and the central through hole 14 communicating with the outer surface 12d of the base plate 12 is formed in the central portion. As a result, the protrusions 13a are elastically deformable independently of each other in the radial direction of the disc holding portion 13, and the compact disc 11 is held in the disc holding portion 1.
The outer diameter of the holding portion 13b can be reduced to such a size that the through hole 11a can be inserted when the holding portion 13b is attached to the holder 3.

On the other hand, a circular pedestal portion 15 is formed higher than the inner surface 12c of the base plate 12 around the disk holding portion 13 thus constructed. And
The pedestal portion 15 is provided on the outer surface 12d of the base plate 12.
Corresponding to the above, there is provided a recess 16 that is recessed one step. The recess 16 is further recessed in the central portion thereof to form the inner surface of the protrusion 13a forming the disc holding portion 13.

Further, the inner peripheral surface 16a of the recess 16 is formed in a drum shape having a portion having the smallest diameter dimension at an intermediate position in the depth direction. That is, the concave portion 16 has an inner peripheral surface 16a whose diameter increases at the inner portion thereof, and forms an undercut 17 at the time of molding.

Further, a ring-shaped ejector mark 18 having a constant width over the entire circumference is formed on the peripheral edge of the recess 16. The ejector mark 18 is formed when the base plate 12 as a molded body is released from a mold described later.

Therefore, in the base plate 12 thus formed, the ejector mark 18 is formed only around the recess 16 formed in the center of the base plate 12. Further, since the ejector mark 18 is formed in a ring shape, the depth thereof is extremely shallow. And it is formed uniformly. Therefore, ejector marks are not formed on other portions of the plate-shaped body 12a.

As a result, the pattern drawn on the compact disc 11 to be arranged inside, the patterns, characters, etc. of other things stored in the disc storage case 10 are not distorted and are as they are. The light is transmitted through the base plate 12 and is observed from the outside.
That is, it is possible to provide the disk storage case 10 whose design aesthetics are not impaired by the base plate 12.

Moreover, by making the base plate 12 integrally carry the function of the conventional tray 4, the tray 4 can be eliminated, and the number of parts can be reduced and the cost can be reduced.

Next, the mold structure of the disk storage case 10 according to this embodiment will be described below. This mold structure is for molding the base plate 12 of the disk storage case 10, and as shown in FIG. 3, a fixed-side mold member 20 that is brought into contact with and separated from each other to form a cavity 19 therebetween. And the movable mold member 21.

The fixed-side mold member 20 is disposed, for example, on the upper side, and is on the inner surface 12c side of the base plate 12, that is, the inner surface 12c of the plate-shaped body 12a and the undercut 22.
The outer surface of the disk holding portion 13 having the above is molded. On the other hand, the movable side mold member 21 is disposed below the fixed side mold member 20 so as to be able to come into contact with and separate from the fixed side mold member 20, and is located on the outer surface 12d side of the base plate 12, that is, the plate-shaped body 1.
The outer surface 12d of 2a, the inner surface of the recess 16 and the inner surface of the disk holding portion 13 are formed.

Further, the movable mold member 21 has a substantially cylindrical core pin 23 forming the inner surface of the disk holding portion 13 in the recess 16 disposed in the central portion and the central through hole 14, and the core pin 23. A sleeve pin 24 having a substantially cylindrical shape, which is provided slidably in the periphery in the mold opening direction and forms a part of the bottom surface 16b of the recess 16 and the inner peripheral surface 16a of the recess 16 having the undercut 17, and the sleeve pin. An ejector sleeve 25 having a substantially cylindrical shape is provided around 24 so as to be slidably fitted in the mold opening direction.

The movable mold member 21 is a sliding bearing 32.
It is attached to a movable side mounting plate 26 arranged below via a rod 33 slidably supported by the. The rod has its large diameter portion 33a abutted on the movable side mounting plate 26 in a state where the movable side mounting plate 26 is lowered to the position shown in FIG. 4, and thereafter, the movable side mounting plate 26 and the movable side mold Member 2
It is designed to work together with 1. The core pin 23 is fixed to the movable side mounting plate 26 and is slidably supported in the sleeve pin 24 so that the core pin 23 can be moved up and down integrally with the movable side mounting plate 26. .

As described above, the sleeve pin 24 is slidably fitted on the core pin 23. At the lower end of the sleeve pin 24, a large-diameter cylindrical portion 24a having a diameter increased by one step is formed.
And a biasing means 27 such as a coil spring is provided inside the large-diameter cylindrical portion 24a. A support member 28 fixed to the movable side mounting plate 26 is arranged below the sleeve pin 24. In the mold clamped state, the lower end surface of the sleeve pin 24 is brought into contact with the upper surface of the support member 28. It is designed to be used.

The urging means 27 is arranged so as to be wound around the core pin 23 in the large-diameter cylindrical portion 24a of the sleeve pin 24, the upper end of which is brought into contact with the sleeve pin 24, and the lower end of which is supported by the supporting member 28. By abutting, the sleeve pin 24 is always biased upward with respect to the support member 28. That is, the sleeve pin 2
When the movable side mounting plate 26 is lowered when the mold is opened, 4 is urged upward by the urging means 27 and held at the position when the mold is clamped.

Further, on the outer peripheral edge of the lower end of the large-diameter cylindrical portion 24a of the sleeve pin 24, a collar-shaped portion 24b is provided, while above the collar-shaped portion 24b, in the vertical direction at the mold clamping position. Stopper members 29, which are arranged at intervals, are fixed to the movable side mounting plate 26. These collar-shaped portions 24
The stopper means 30 is constituted by b and the stopper member 29.

As a result, the movable side mounting plate 26 is opened when the mold is opened.
When the stopper pin 29 is lowered, the stopper member 29 is also lowered. However, by holding the sleeve pin 24 at the mold clamping position by the biasing means 27, the collar-shaped portion 24
The distance between b and the stopper member 29 is shortened. And
When the movable side mounting plate 26 is lowered by a predetermined size, the collar-shaped portion 24b contacts the stopper member 29, and thereafter, the sleeve pin 24 is lowered together with the movable side mounting plate 26. .

The ejector sleeve 25 is provided so as to form a ring-shaped ejector mark 18 around the recess 16 by uniformly projecting the peripheral edge of the recess 16 over the entire circumference. This ejector sleeve 25 is
The lower end is supported by the ejector plate 31. The ejector plate 31 is urged downward by a spring (not shown) arranged between the ejector plate 31 and the movable mold member 21. Therefore, when the mold is opened, the fixed-side mold member 20
On the other hand, when the movable mold member 21 is lowered, the movable mold member 21 is also lowered until the pressing from below by the ejector rod (not shown) is started.

When the ejector rod presses the ejector plate 31 from below, the ejector plate 31 is opposed to the movable mold member 21 against the biasing force of the spring between the ejector plate 31 and the movable mold member 21. As a result, the ejector sleeve 25 has its tip projecting toward the cavity 19 side with respect to the movable mold member 21 so that the base plate 12, which is a molded body, is removed from the movable mold member 21. It is designed to be released.

A case in which the base plate 12 of the disk storage case 10 is molded by the mold structure according to this embodiment having the above-described structure will be described below. At the time of molding, first, as shown in FIG.
The movable mold member 21 is raised with respect to 0 and brought into close contact therewith, and a cavity 19 for molding the base plate 12 is formed between the two in a sealed state. In this state, the base plate 12 is molded by filling the cavity 19 with molten resin from a gate (not shown) and cooling and solidifying.

Next, the case where the base plate 12 thus formed in the cavity 19 is released from the mold members 20 and 21 will be described. In order to release the base plate 12 from the mold members 20 and 21, first, as shown in FIG. 4, the movable side mounting plate 26 is lowered with respect to the fixed side mold member 20 to fix it to the fixed side mold member 20. The core pin 23, which has been formed, is lowered and pulled out from the recess 16. Then, at the position of FIG. 4, the large diameter portion 3 of the rod 33 is
Since 3a comes into contact with the movable side mounting plate 26, the movable side mold member 21 is lowered together with the movable side mounting plate 26 thereafter.

Then, when the movable side mounting plate 26 is lowered to the position shown in FIG. 5, the movable side mold member 21 is also lowered with respect to the fixed side mold member 20. At this time, since the ejector plate 31 is pressed downward from the movable side mold member 21 via the spring, the sleeve pin and the ejector sleeve are also lowered together with the movable side mold member 21. At the position shown in FIG. 5, the ejector plate starts to be pressed from below by an ejector rod (not shown), and thereafter, against the pressing force of the spring, the ejector plate is pressed against the movable mold member 21. It will be relatively increased.

In this case, in the base plate 12 according to the present embodiment, the outer peripheral surface of the disk holding portion 12 on the inner surface 12c side and the recess 16 on the outer surface 12d side inner peripheral surface 16 are formed.
Since the undercuts 22 and 17 are formed in each a, the base plate 12 is
7, the fixed mold member 20 and the movable mold member 2
1 to be held in an adhesive state. Here, in this embodiment, since the core pin 23 is pulled out from the recess 13 as described above, a space is formed on the inner surface side of the disc holding portion 13, and each of the disc holding portions 13 is formed. The protrusion 13a is elastically deformable inward in the radial direction.

Therefore, as shown by the chain line in FIG. 2, each protrusion 13a is elastically deformed to reduce the outer diameter dimension of the holding portion 13c, and the undercut 22 formed in the disk holding portion 13 is reduced. Will be removed first. That is, the base plate 12, which is a molded body, is completely released from the fixed-side mold member 20 first.

Then, when the movable side mounting plate 26 is further lowered, the ejector sleeve 25 is projected into the cavity 19 from the upper surface of the movable side mold member 21, as shown in FIG. As a result, the releasing operation of the base plate 12 from the movable mold member 21 is also started. In this case, since the sleeve pin 24 forming the inner peripheral surface 16a of the recess 16 is always urged upward by the urging means 27, the ejector sleeve is irrespective of the lowering operation of the movable side mounting plate 26. It is arranged integrally with 25.

Therefore, as shown in FIG. 6, the sleeve pin 23, together with the ejector sleeve 25 and the fixed side mold member 20 side, is in a state in which the tip portion 23b of the sleeve pin 23 does not come off from the undercut 17 formed on the inner peripheral surface 15a of the recess 15. Therefore, the base plate 12 is released from the movable mold member 21 other than the inner peripheral surface 16a of the recess 16. As a result, all parts except the inner peripheral surface 16a of the recess 16 are released from the fixed-side mold member 20 and the movable-side mold member 21.

Further, at the position shown in FIG. 6, the collar-shaped portion 24b of the large-diameter cylindrical portion 24a provided on the sleeve pin 24 abuts on the stopper member 29 arranged above it, and thereafter the sleeve pin 24 is It will be lowered together with the movable side mounting plate 26. That is, when the movable side mounting plate 26 is further lowered, the sleeve pin 24 is relatively lowered with respect to the ejector sleeve 25, as shown in FIG. 7. In this case, the base plate 12 is
While being supported from below by the upper end surface 25a of the ejector sleeve 25, it is pulled downward by the fastening force between the sleeve pin 24 and the inner peripheral surface 16a of the recess 16.

However, in the mold structure of this embodiment,
The base plate 12 has already been released from the mold members 20 and 21 in most areas thereof, and is in a state where it can be freely deformed by an external force. Therefore, the wall surface of the recessed portion 16 forming the undercut 17 is not constrained at all and is deformed so as to follow the tensile force of the sleeve pin 24, and the sleeve pin 24 is removed from the undercut 17. Become.

That is, according to the mold structure of this embodiment,
It has the following excellent effects. First, since the ejector for releasing the base plate 12 from the movable mold member 21 is constituted by the substantially cylindrical ejector sleeve 25, the base plate 12 can be projected with a wider pressing area than that of the ejector pin. Therefore,
Since a uniform pressing force acts on the entire base plate 12 and the pressing force can be suppressed to an extremely low level, the ejector mark 18 formed at the time of protrusion can be made shallow and uniform.

Particularly, when the pressing force can be suppressed to be extremely low, the ejector mark 18 is provided between the sleeve pin 24 and the ejector sleeve 25 and the ejector sleeve 2.
5 and the concave portion 16 formed between the movable mold member 21 and the concave portion 16 can be formed as two concentric circular nest marks 18a. As a result, the ejector mark 18 formed by the mold structure according to the present embodiment has the appearance that the ejector mark 1 is
Disk storage case 10 rather than being recognized as 8
Will be formed to the extent that it can be recognized as part of the design. Therefore, as compared with the conventional method in which a deep ejector mark is locally formed on a part of the plate-shaped body 12a, the aesthetic appearance is not impaired, and a decrease in product value can be avoided.

Further, according to the mold structure of the present embodiment, the undercut 17 is formed by forming the disk holding portion 13 forming the undercut 22 on the inner peripheral surface 16a of the recess 16 on the back surface thereof.
The mold member 20 is released from the fixed-side mold member 20 by the fastening force by the, and the sleeve pin 24 is removed from the undercut 17 formed on the inner peripheral surface 16a of the recess 16 and all other parts are removed from the mold member 20. Since it is carried out in a state of being separated from the mold 21, the wall surface of the concave portion 16 can be freely deformed and the sleeve pin 24 can be removed from the undercut 17 without difficulty.

Therefore, the disadvantage that the undercut 17 of the inner peripheral surface 16a of the recess 16 is scraped off when the sleeve pin 24 is removed can be avoided, and the base plate 12 in a sound state can be taken out from the mold structure. Further, such a mold member 20. 2 of the base plate 12
The releasing operation from 1 can be achieved by an extremely simple configuration.

Further, according to the disk storage case 10 of the present embodiment, the illustration of the compact disk 11 and the lyrics card 5 and the like to be stored inside by molding the base plate 12 with a transparent resin material,
Characters, patterns, etc. are visible through the base plate 12 from the outside. In this case, according to the disc storage case 10 of the present embodiment, since the local ejector mark is not formed on the plate-shaped body 12a, it is possible to prevent the pattern or the like from being distorted, and the design is aesthetically pleasing. It can be prevented from being damaged.

Further, the tray 4 which is conventionally used only for holding the compact disc 11 in the disc storage case 10 is eliminated, and the disc holding portion 13 provided on the tray 4 is formed on the base plate 12. Therefore, the number of parts can be reduced, and the number of assembling steps and the cost can be reduced.

Although the disk storage case 10 made of a transparent resin material has been described as an example in the above embodiment, the disk storage case 10 made of a translucent or opaque resin material is used instead. It may be that. Even in this case, since the ejector mark as an indentation is not formed on the plate-shaped portion 12a of the base plate 12, it is possible to provide the disc storage case 10 having a high product value.

Further, the disk holding portion 13 is formed in a reverse taper shape in which the diameter gradually increases toward the tip, or the concave portion 16 is formed.
Although the inner peripheral surface 16a is formed in a drum shape in which the diameter is reduced at an intermediate position, the present invention is not limited to this, and the undercut 17
Can be applied in all cases in which Further, the biasing means 27 is a coil spring, but instead of this, any other biasing means 27 such as a hydraulic / pneumatic cylinder or a disc spring may be adopted.

[0063]

As described above in detail, the disk storage case according to the present invention has a base plate capable of housing a disk body inside a plate-like body having a rectangular shape in plan view, and is swingably attached to one side thereof. It consists of a cover plate, on the inner surface of the base plate, a plurality of protrusions arranged on the circumference at intervals and elastically deformable in the radial direction,
A disc holding portion having a fitting portion that can be fitted into the through hole of the disc body and a holding portion having a diameter larger than that of the through hole is provided, and the inner peripheral surface is at the open end on the outer surface of the base plate and the central portion thereof. Since there is a concave portion that reduces its diameter toward and a ring-shaped ejector mark formed around it, the tray for holding the disc body inside the disc storage case is eliminated, and the number of parts is reduced. Therefore, it is possible to reduce the cost.

Further, since the ejector mark which the ejector is pressed to remove the molded disk body from the mold member is formed in a ring shape, a local pressing force such as when pressing by the ejector pin is applied. Application is avoided and the base plate can be released from the mold member with a relatively small and uniform pressure distribution. Further, since the ejector mark is not formed on the plate-shaped body, it is possible to prevent the appearance from being impaired.

Further, if the disk storage case is made of a transparent resin material, the ejector traces are evenly formed only around the central recess, so that the disk storage case can be disposed inside the disk storage case. It is possible to prevent the pattern of the disc body and other things from being distorted when passing through the base plate. as a result,
Since the pattern of the disc body to be stored is grasped as it is from the outside of the disc storage case, it is possible to effectively prevent the appearance of the entire design including the internal storage items such as the disc body from being spoiled. There is an effect that can be.

Further, the mold structure of the disk storage case according to the present invention comprises a fixed mold member for molding the inner surface side of the molded body and a movable mold member for molding the outer surface side of the molded body. The side mold member is a columnar core pin that molds the inner surface of the disk holding portion, and a cylindrical sleeve pin that is externally slidably fitted to the outer surface of the disk holding portion in the mold opening direction to form the inner peripheral surface of the recess.
A cylindrical ejector sleeve which is slidably fitted to the outer surface in the mold opening direction and presses the entire circumference of the recess when the molded product is released from the mold, and the ejector sleeve is a movable mold member. When the molded body is released from the mold, urging means for moving the sleeve pin integrally with the ejector sleeve, and locking the movement of the sleep pin in a state where the molded body is separated from other mold members Since the core pin is pulled out to allow the free elastic deformation of the projection, the undercut provided on the inner peripheral surface of the recess holds the compact in the movable die and holds the disc. The fixed side mold is removed from the undercut provided in the section, and the sleeve pin is removed from the undercut on the inner peripheral surface of the recess while most of the molded body is released from the mold member by the sleeve pin. It can be removed.

Therefore, when each undercut provided on the molded body is removed from the die member, the molded body itself is deformed in accordance with the external force, thereby preventing excessive stress concentration. Therefore, it is possible to avoid such an inconvenience that the undercut is scraped off. Further, since the ejector sleeve presses the molded body with a wide pressing area, it is possible to prevent the ejector trace from being locally formed deeply, and it is possible to form the ejector trace as a part of the external design. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a disc storage case according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a disc holding portion provided on a base plate of the disc storage case of FIG.

FIG. 3 is a vertical cross-sectional view showing a mold structure of a disk storage case according to the present invention.

FIG. 4 is a vertical cross-sectional view showing a state where core pins are pulled out in the mold structure of FIG.

5 is a vertical cross-sectional view showing a case where a movable side mold member is lowered in the mold structure of FIG.

6 is a vertical cross-sectional view showing a case where a molded body is released from a movable side mold member by an ejector sleeve in the mold structure of FIG.

FIG. 7 is a vertical cross-sectional view showing a state where the sleeve pin is pulled out from the inner peripheral surface of the recess in the mold structure of FIG.

FIG. 8 is a perspective view showing a conventional example of a disk storage case.

[Explanation of symbols]

 3 cover plate 10 disc storage case 11 compact disc (disc body) 11a through hole 12 base plate 12a plate-like body 12c inner surface 12d outer surface 13 disc holding portion 13a projection 13b fitting portion 13c holding portion 16 concave portion 16a inner peripheral surface 18 ejector trace 20 Fixed side mold member 21 Movable side mold member 23 Core pin 24 Sleeve pin 25 Ejector sleeve 27 Biasing means 30 Stopper means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // B29K 105: 32 B29L 22:00

Claims (3)

[Claims] 1. A disk storage case for removably housing a disk body having a through hole in the center thereof, wherein a base plate capable of housing the disk body inside a plate-shaped body formed in a rectangular shape in plan view, A cover plate that is swingably attached to one side of the base plate and can be opened and closed with respect to the base plate. The cover plate is arranged on the inner surface of the base plate so as to project in the central portion of the base plate and to be circumferentially spaced and elastic in the radial direction. A disc holding portion which is composed of a plurality of deformable protrusions, and has an outer peripheral surface having a fitting portion capable of being fitted into the through hole of the disc body, and a holding portion having a diameter larger than the through hole on the tip side thereof. Is provided on the outer surface of the base plate, and a concave portion is formed in the central portion of which the inner peripheral surface is reduced in diameter toward the opening end, and a phosphorus formed around the concave portion. A disk storage case, which is provided with a rugged ejector mark. 2. The disk storage case according to claim 1, wherein the base plate is made of a transparent resin material. 3. A disk holding portion, which comprises a plurality of elastically deformable projections protruding from the central portion of the inner surface of a plate-like body having a rectangular shape in plan view and arranged at intervals on the circumference, the diameter of which increases toward the tip. A mold structure of a disk storage case for molding a molded body having a concave portion whose inner peripheral surface reduces in diameter toward the opening end in the central portion of the outer surface of the plate-shaped body, the inner surface side of the molded body A movable-side mold member for molding the outer side of the molded body, the movable-side mold member being configured to contact and separate from the fixed-side mold member. A columnar core pin that molds the inner surface of the disc holding portion, a cylindrical sleeve pin that is externally slidably fitted to the outer surface of the core pin in the mold opening direction to form the inner peripheral surface of the recess, and the sleeve pin. When the molded product is released from the outside, it is slidably fitted in the mold opening direction. A cylindrical ejector sleeve that presses the circumference of the recess over the entire circumference is provided, and the movable side mold member is provided between the sleeve pin and the sleeve pin, and the sleeve pin is a fixed side mold member. In a state where the molded body is released from the movable side mold member excluding the sleeve pin, and the urging means for urging the movable side mold member to dispose the sleeve pin integrally with the ejector pin regardless of the displacement of the movable side mold member. And a stopper means for locking the sleeve pin to the movable mold member, the mold structure of the disk storage case.