JP2002184151A - Molding die for disk cartridge and disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding die for disk cartridge to prevent increase of cost of the molding die to mold a case when a shutter press plate is integrally formed with the case and the disk cartridge produced by the molding die. SOLUTION: The molding die 50 for disk cartridge is provided with the case to store a disk-like medium rotatably and having an opening and a shutter member to open and close the opening part by being slid on the surface of the case and the shutter press plate that presses the tip end of the shutter member is provided with a fixed-side die 60 and a movable-side die 70 to mold the disk cartridge integrally formed with the case. A part of the fixed-side die and a part of the movable-side die to form an insertion port 18 into which the shutter press plate 14 and the tip of the shutter member are inserted are constituted of inserts 61, 71 and the inserts form a part of a side wall 12a of the opening part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case in which a disk-shaped medium such as an optical disk or a magneto-optical disk is rotatably housed in a case having a drive shaft insertion hole and an opening such as a head window for writing and reading data. In addition, the present invention relates to a molding die for molding a disk cartridge having a shutter member for opening and closing the opening and a disk cartridge produced by the molding die. The present invention relates to a molding die for a disk cartridge formed in the above.

[0002]

2. Description of the Related Art Conventionally, a disk cartridge is provided with a shutter for opening and closing an opening such as a head window for data writing / reading of a case in a disk cartridge, and a shutter pressing plate for pressing a tip of the shutter is formed integrally with the case. Is known (actual fairness 5
-21721). FIG. 7 shows a partial cross-sectional view of such a case. A shutter pressing plate 81 is formed integrally with the case 80 so as to be thinner than the case 80, and a distal end 8 of the shutter 83 is provided in a space 82 below the shutter pressing plate 81.
3a is located, and is pressed by the shutter pressing plate 81, so that the shutter 81 can be stably opened and closed.

However, when the shutter pressing plate 81 is formed integrally with the case 80 as shown in FIG. 7, a mold for molding the shutter pressing plate 81 has portions that are in sliding contact with both the movable mold and the fixed mold. There is a problem in that this portion is severely worn. That is, as shown in a partial cross-sectional view of the molding die in FIG. 8, a portion of a fixed die 600 and a movable die 700 in a molding die 500 in which a shutter holding plate is formed integrally with a case. If X slides and the mold clamping and mold opening are repeated during the molding operation, the abrasion proceeds at the sliding contact portion X. As a result, the mold life is shortened, the mold cost is increased, and the production cost of the disk cartridge is increased.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention does not increase the cost of a molding die for molding the case when the shutter holding plate is formed integrally with the case. An object of the present invention is to provide a molding die for a disk cartridge as described above and a disk cartridge produced by the molding die.

[0005]

In order to achieve the above object, a molding die for a disk cartridge according to the present invention comprises:
A case that rotatably accommodates the disk-shaped medium and has an opening; and a shutter member that slides on the surface of the case to open and close the opening. A molding die including a fixed die and a movable die for molding a disk cartridge formed integrally with a case, wherein an insertion opening into which a tip of the shutter pressing plate and the shutter member is inserted is formed. At least one of the fixed-side mold portion and the movable-side mold portion is formed by nesting, and the nesting forms a part of the side wall of the opening.

According to this molding die for a disk cartridge, even if the portion of the fixed die and / or the portion of the movable die are worn by molding of the case in which the shutter holding plate is integrally formed, only the nesting is performed. Since it is sufficient to replace the mold, the cost of the molding die does not increase so much. In addition, since the nest is configured to have such a size as to form a part of the side wall of the opening, the problem of a decrease in strength at the nest does not occur.

In this case, it is preferable that the insert is provided in the movable mold for molding the back side of the case.
Thereby, since the dividing line formed for nesting at the time of molding appears on the back side of the case but does not appear on the front side,
The problem of poor appearance due to the dividing line can be avoided. In the case where the nest is provided only on the movable mold, for example, it is preferable that the hardness of at least the sliding contact portion of the fixed mold with the nest is higher than that of the nest from the viewpoint of abrasion of the molding die.

Therefore, according to the disk cartridge of the present invention formed by the above-described molding die, even when the shutter holding plate is integrally formed by the molding die having the nest structure in the case, the appearance of the dividing line by the nest is obtained. No defect problem occurs.

[0009] Further, it is preferable that the nest is narrower than a width of the shutter member in a sliding direction in a region from a tip end of the shutter pressing plate to the opening. Thereby, even if the dividing line formed for the nesting at the time of molding appears in the case, it is covered and hidden by the shutter member, so that the problem of poor appearance due to the dividing line does not substantially occur. For this reason, even if the fixed mold has no nest and the case is translucent or semi-transparent and the dividing line on the back side is visible from the outside, there is substantially no problem of poor appearance. .

Therefore, in the disk cartridge of the present invention formed by the above-described molding die, the dividing line formed by the insert is narrower than the width of the shutter member in the sliding direction, and the shutter member is formed by the opening. When the shutter is closed, the shutter is covered with the shutter member, so that the problem of poor appearance due to the dividing line does not substantially occur.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a disk cartridge according to an embodiment of the present invention. The disk cartridge 1 shown in FIG. 1 accommodates a disk-shaped medium 4 rotatably in a planar and rectangular case composed of an upper case 10 and a lower case 20 having substantially the same shape as the disk case 1. A cover member 30 is provided to allow the medium 4 to be taken in and out and to be exchangeable. The disc cartridge 1 is a CD, CD-R, CD-RW, DVD, DVD
-R, a disk-shaped medium 4 having a relatively large diameter such as a DVD-RAM is stored.

The upper case 10 and the lower case 20 are provided with drive shaft insertion holes 12, 22 into which a drive shaft of the device is inserted when the disk cartridge is set in the device for writing or reading data, and the device. Are provided with head windows 11 and 21 into which the heads are inserted for writing or reading data. The drive shaft insertion holes 12, 22 and the head windows 11, 21 are connected to each other.

The upper case 10 and the lower case 20 are
It can be formed of a translucent or translucent resin material, for example, a polycarbonate resin (PC), an acrylic resin (PMMA), a polystyrene (PS) resin, or the like. Further, these resins may be colored. The upper case 10 and the lower case 20 are integrated by welding or the like.

The outer surface of the case is provided with a shutter member 5 having a U-shaped cross section for closing the drive shaft insertion holes 12, 22 and the head windows 11, 21 when the disc cartridge 1 is not used. A shutter member 5 is provided on an outer surface 10a of the upper case 10 for opening and closing the drive shaft insertion holes 12, 22 and the head windows 11, 21 in cooperation with the sliders 6a, 6b and the spring 7. In the area 13, it slides in the direction C in the drawing and the opposite direction C ′. Note that a similar shutter sliding area is also provided in the lower case 20, and the shutter member 5 slides similarly.

A cover member 30 is attached to the upper case 10 and the lower case 20 on the side opposite to the side where the shutter member 5 is provided. The cover member 30 is positioned in the direction indicated by the arrow A in FIG.
B is slidable. When the cover member 30 moves in the direction A, the case is closed and the cover member 3 is closed.
0 is held in the closed position by the lock portion 31. At this time, the rear wall 35 of the cover member 30 constitutes the rear wall of the disc cartridge 1. Further, the cover member 30 is moved in the direction B.
, And can be removed from the case. However, a structure that does not separate from the upper case 10 and the lower case 20 when moved in the direction B can also be adopted.

The cover member 30 has an erroneous erasure prevention member 8 incorporated therein, and supports 32, 33 for supporting the disk-shaped medium 4 from below and a cover corresponding to the outer periphery of the disk-shaped medium 4. Each of the member annular walls 36 is formed. The protruding portion 34 is for contacting the disk-shaped medium 4 when the cover member 30 is pulled out from the case and moving the disk-shaped medium 4 together with the cover member 30 to the outside of the case.

As shown in FIG. 1, the shutter member 5 is used to open and close the drive shaft insertion holes 12, 22 and the openings of the head windows 11, 21 formed in the upper case 10 and the lower case 20, respectively. It is composed of a plate 51, a lower plate 52, and an elongated connecting plate 53 connecting them. Connecting plate 5
A projection 53a is formed at the center of the shutter 3, and the shutter member 5 moves in the left and right directions C and C 'when the shutter opening / closing member (not shown) of the apparatus comes into contact with the left and right ends. Open and close.

The distal ends 51a and 52a of the upper plate 51 and the lower plate 52 of the shutter member 5 are formed in thin portions. This is because when the tip portions 51a and 52a have the same thickness as the upper plate 51 and the lower plate 52, the insertion port 1 shown in FIG.
When the shutter member 5 is inserted into the shutter 8, the clearance between the shutter member 14 and the shutter pressing plate 14 becomes small, which may adversely affect the slidability of the shutter member 5. When the shutter member 5 is made of a plastic resin, it is easy to change the thickness of the tip portions 51a and 52a to a thin portion as shown in FIG. 1, but when the shutter member 5 is made of a metal, the rigidity is high. Therefore, the entire thickness can be reduced without making the tip portions 51a and 52a particularly thin portions.

FIG. 2 is a plan view (a) on the outer surface side of the upper case 10, a plan view (b) on the inner surface side, and an enlarged sectional side view (c) taken along line IIC-IIC and enlarged. It is. The lower case 20 has the same configuration as the upper case 10 described below.

As shown in FIG. 2 (a), the shutter sliding area 13 on the outer surface 10a of the upper case 10 sandwiches the head window 11 and the drive shaft insertion hole 12 formed so as to be interposed therebetween. Are provided on both sides thereof, and are relatively long regions in the vertical direction in FIG. For this reason, the shutter member 5 is configured to be relatively long as shown in FIG. Further, the shutter sliding area 13 is formed lower than other surfaces to prevent the outer surface of the shutter member 5 from protruding from the outer surface of the case when the shutter member 5 is assembled in the case.

As shown in FIGS. 2 (a), 2 (b) and 2 (c), a shutter pressing plate is provided near the shutter sliding area 13 and corresponding to the front end portions 51a and 52a of the shutter member 5. 14 is formed integrally with the upper case 10 at the same plane height as the outer surface 10 a of the upper case 10. The front end portions 51a and 52a of the shutter member 5 are located on the rear surface 14a side of the shutter pressing plate 14, and slide while being guided and positioned between the rear surface 14a and the shutter sliding region 13 while being pressed. It has become.

The width b of the shutter pressing plate 14 is set so that it does not come off the shutter pressing member 14 when the shutter member 5 slides in the left and right directions C and C '. As shown in FIG. 2C, an insertion port 18 into which the tip of the shutter member 5 is inserted is formed in this portion in order to form the shutter holding plate 14 integrally with the upper case 10.
On the left and right sides of the shutter pressing plate 14 in FIG. 2, there are formed step portions 16 which are lower than the shutter sliding region 13.

The shutter member 5 is moved to its tip portions 51a, 5a.
2a is the back surface 14a of the shutter holding plate 14 (FIG. 2).
When the shutter member 5 is attached so as to enter the insertion port 18 on the side (c)), the shutter member 5 is pressed and positioned by the shutter pressing plate 14. Although the shutter member 5 shown in FIG. 1 is obtained by plastic resin molding, the thin end portions 51a and 52a of the shutter member 5 tend to fall inward due to the thin molding of the plastic resin and bend so that the two approach each other. For this reason, the distal end portions 51a and 52a
8, the apparent thickness is increased, which may adversely affect the slidability. Therefore, as shown in FIG.
A step portion 16 lower than the shutter sliding area 13 is provided,
The bent front end 51a shown by the broken line is configured to enter the insertion opening 18 widened by the step portion 16, so that the bent front end 51a can be absorbed and the slidability of the front end 51a can be prevented from being reduced. . FIG.
(A) and (c), the drive shaft insertion hole 1 which is an opening.
Numeral 2 is formed in a circular arc shape on the side of the shutter pressing plate 14, and is located almost at the center of the shutter pressing plate 14 and closest to the front end portion 14 b of the shutter pressing plate 14. Note that the above-described configurations are the same in the lower case 20.

FIG. 3 shows a main part of a molding die 50 for molding the upper case of FIGS. 1 and 2, and a shutter holding plate and an insertion port of the upper case shown in a sectional view of FIG. 2 (c). 3 is a cross-sectional view of a portion corresponding to the vicinity of FIG.

As shown in FIG. 3, a molding die 50 for molding the upper case 10 shown in FIGS.
The fixed mold 60 forms the front surface 10a side of the upper case 10 and the movable mold 70 forms the back surface 10b side. In the fixed mold 60 and the movable mold 70, nests 61 and 71 are used to form the shutter pressing plate 14 into which the distal end portion 51a of the shutter member 5 is inserted and the insertion opening 18 thereof. In addition, nesting 61,7
1 extends from a portion where the shutter holding plate 14 and the insertion opening 18 are formed so as to include the arc-shaped side wall positions 12b and 12c of the drive shaft insertion hole 12 which is an opening as shown in FIG. I have. The inserts 61 and 71 are configured to form the side wall 12a of the drive shaft insertion hole 12 in an arc between the side wall positions 12b and 12c. The nests 61 and 71 are in contact with each other at a sliding contact portion X.

As described above, by forming the molding die 50 into a nested structure in which nests 61 and 71 are provided between the fixed die 60 and the movable die 70, the mold is closed and the mold is opened by repeating molding. Is nested 6 by repeating
When abrasion or the like occurs in the sliding portions X of the first and the first 71, only the inserts 61 and 71 need to be replaced, and it is not necessary to replace the whole of the fixed mold 60 and the movable mold 70. The cost is not so high. Thus, the life of the molding die is extended, so that the die cost does not increase and the production cost of the disk cartridge does not increase.

As shown in FIGS. 2 (a), 2 (c), and 3, the inserts 61, 71 reach the drive shaft insertion hole 12, and insert the drive shaft in an arc between the side wall positions 12b and 12c. Since the size is such that the side wall 12a of the hole 12 is formed, the problem of a decrease in the strength of the inserts 61 and 71 does not occur. As described above, the nests 61 and 71 only need to have a nested structure in which only the sliding contact portions X are provided. However, since there is a problem in nesting strength, it is preferable that the nests 61 and 71 be large enough to reach the drive shaft insertion hole 12. . If the nests 61 and 71 are too large, the cost of nesting increases, which is not preferable.

Next, a modification of the molding die shown in FIG. 3 will be described with reference to FIGS. 4 is a sectional view of a main part of a molding die similar to that of FIG. 3, and FIG. 5 is a plan view (a) on the outer surface side and a plan view on the inner surface side of the upper case formed by the molding die of FIG. b).

As described above, the nest 61,
When the structure of No. 71 is adopted, the upper case 10
2A and 2B are provided on the front surface 10a and the back surface 10b of FIG.
Dividing lines (nested lines) 19a, 19
b appears, especially the product (upper case 10)
The appearance is degraded by the dividing line 19a appearing on the outer surface 10a, and the commercial value is reduced. Therefore, as shown in FIG. 4, a nest 71 similar to that of FIG. 3 is provided only on the movable mold 70 side, and the movable mold 70 has a nest structure, and the fixed mold 60 has a nest structure as in the related art. You may not take it. However, in the case of such a structure, the hardness of the fixed-side mold 60 is higher than that of the nest 71 at least in the sliding contact portion X by making the surface treatment and the material of the nest 71 different from those of the fixed-side mold 60. It is preferable to do so.

When only the movable mold 70 has a nested structure as shown in FIG. 4, the dividing line 19 is formed as shown in FIG.
b appears on the back surface 10b of the upper case 10, as shown in FIG.
Since the dividing line 19a as shown in FIG. 2A does not appear on the front surface 10a of the upper case 10, the dividing line cannot be seen from the outer surface of the disk cartridge. Therefore, the appearance defect due to the dividing line formed due to the adoption of the nested structure does not substantially pose a problem.

Next, another modification of the molding die of FIG. 3 will be described with reference to FIG. FIG. 6 is a plan view of the inner surface side of the upper case 10 formed by the forming die of the present modification.

As shown in FIG. 6, in the molding die of this embodiment, the width w of the insert is reduced, and the insert
The region 19c surrounded by the dividing line 19b formed on the side of the drive shaft insertion hole 12 from the distal end portion 14b,
The hatched region 19c extending from b to the drive shaft insertion hole 12 is configured to be narrower than the width Y of the shutter member 5 indicated by a two-dot chain line.

By adopting the above configuration, FIG.
When the shutter member 5 closes the head window 11 and the drive shaft insertion hole 12 as shown in FIG.
Covers the region 19c, so that the dividing line 19b can be hidden. Therefore, since the dividing line is not visible from the outer surface of the disk cartridge, the appearance defect due to the dividing line formed by adopting the nested structure does not substantially pose a problem. If the case is formed of a translucent material, the dividing line 19b is visible from the outside of the case not only in the case of FIG. 2 but also in the case of FIG. 5, resulting in poor appearance. According to the configuration, such a problem does not occur. In addition,
The width b of the shutter pressing plate 14 is larger than the width Y of the shutter member 5 and protrudes from the shutter member 5 at the left and right ends, but the protruding portion forms the outer edge of the shutter pressing plate 14, resulting in poor appearance. No problem.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to these embodiments.
Various modifications are possible within the scope of the technical idea of the present invention. For example, in the present embodiment, the present invention is applied to a disk cartridge in which a disk-shaped medium can be exchanged. Further, although the molding die for the upper case has been described, it goes without saying that the molding die for the lower case can be similarly configured. The opening that is opened and closed by the shutter member may be an opening including a drive shaft insertion hole and a head window for writing and reading data.
It is not limited to these. Further, the present invention may be applied to a cleaning disk cartridge.

[0035]

According to the present invention, when the shutter holding plate is formed integrally with the case, even if abrasion occurs at the sliding contact portion of the molding die for molding the case, the cost of the molding die does not increase. Thus, a molding die for a disk cartridge can be provided. For this reason, even if a nesting structure is employed in the molding die, the strength of the nesting does not decrease. Further, it is possible to substantially prevent the problem of poor appearance due to the dividing line appearing on the case of the disk cartridge produced by the molding die.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a disk cartridge according to an embodiment of the present invention.

2 is a plan view (a) of the outer surface side of the upper case 10 in FIG.
It is the top view (b) of an inner surface side, and the expanded side sectional drawing (c) which cut | disconnected along IIC-IIC line and was seen and expanded.

FIG. 3 is a main part of a molding die for molding the upper case 10 of FIGS. 1 and 2, which is located near a shutter holding plate and an insertion opening of the upper case shown in a sectional view of FIG. It is sectional drawing of a corresponding part.

FIG. 4 is a sectional view of a main part showing a modification of the molding die of FIG. 3;

5A is a plan view of the outer surface side of the upper case 10 formed by the molding die shown in FIG. 4, and FIG. 5B is a plan view of the inner surface side.

FIG. 6 is a plan view of another modification of the molding die of FIG. 3, on the inner surface side of the upper case 10 molded by the molding die.

FIG. 7 is a sectional view of a main part of a conventional disk cartridge.

FIG. 8 is a sectional view of a main part of a conventional molding die.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Disk cartridge 4 Disk-shaped medium 5 Shutter member 10 Upper case 10a Upper case surface 10b Upper case back surface 11 Head window (opening) 12 Drive shaft insertion hole (opening) 12a Side wall of drive shaft insertion hole 13 Shutter sliding Area 14 Shutter press plate 14b Tip of shutter press plate 16 Step 18 Insertion port 19a, 19b Dividing line 19c Region from tip 14b of shutter press plate 14 to drive shaft insertion hole 12 Lower case 21 Head window 22 Drive shaft Insertion hole 51 Upper plate of shutter member 52 Lower plate of shutter member 53 Connecting plate 51a, 52a Tip of shutter member 50 Mold 60 Fixed side mold 70 Movable side mold 61, 71 Nest X Slide contact part w Nest Width (width of area 19c) Y Width of shutter member C, C ' Sliding direction of member

Claims (5)

[Claims] 1. A case having a disk-shaped medium rotatably accommodated therein and having an opening, and a shutter member sliding on the surface of the case to open and close the opening, and pressing a tip of the shutter member. A molding die having a fixed die and a movable die for molding a disk cartridge in which a shutter holding plate is formed integrally with the case, wherein the tip of the shutter holding plate and the shutter member is inserted. At least one of the fixed-side mold portion and the movable-side mold portion for forming an insertion opening to be inserted is formed of a nest, and the nest forms a part of a side wall of the opening. Mold for disk cartridge. 2. The molding die for a disk cartridge according to claim 1, wherein the insert is provided on the movable die for molding a back side of the case. 3. The shutter according to claim 1, wherein the nest is narrower than a width of the shutter member in a sliding direction in a region from a tip end of the shutter pressing plate to the opening. 3. The molding die for a disk cartridge according to 2. 4. A disk cartridge formed by the molding die according to claim 1. 5. A disk cartridge formed by a molding die according to claim 3, wherein a dividing line formed by the nest is narrower than a width of the shutter member in a sliding direction, and the shutter member is formed. The disk cartridge is covered by the shutter member when the opening is closed.