JPH05305989A - Disk cartridge case - Google Patents

Abstract

PURPOSE:To make putting-together easy without producing a weld line by a method wherein injection gates for forming by injection molding a top plate member and a bottom plate member that are to be put together to make a case for an optical disk or the like are so set that they can become symmetrical on both sides of a virtual plane that is positioned between both of the plate members and in parallel with the top plate member. CONSTITUTION:A disk cartridge case described herein is constructed of a top plate member 1 and a bottom plate member 2. The top plate member 1 is formed of a top plate part 1a, inner side wall parts 11 and 12, an inner rear wall part and engaging projecting stripes 14 that are provided in projection to the above-mentioned wall parts. The bottom plate member 2 is formed likewise of a bottom plate part 2a, outer sidewall parts 17 and 18, an outer rear wall part 19 and engaging grooves 20, 21 and a brim 22 that are provided in projection respectively to the above-mentioned wall parts. Injection gate marks G1 and G2 for forming by injection molding the above- mentioned top plate and bottom plate members are so set that they can become symmetrical on both sides of a virtual plane that is positioned between both of the plate parts 1a and 2a and in parallel with those plate parts when both of the members 1 and 2 are put together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge case for accommodating a disc cartridge constituted by accommodating a recording disc such as an optical disc or a magneto-optical disc.

[0002]

2. Description of the Related Art Heretofore, a so-called case has been used as a case for accommodating a disk cartridge constituted by accommodating a recording disc in a cartridge or a tape cassette constituted by accommodating a tape reel fitted with a recording tape in a cassette. Sleeve cases have been proposed.

In this sleeve case, a sheet material made of a synthetic resin material such as polypropylene (PP) or polyethylene terephthalate (PET) is bent and formed into a housing, and a bag-like structure having a slit-shaped opening on the front side. Is configured. That is, the disc cartridge and the like are inserted and housed in the sleeve case through the slit-shaped opening on the front side of the sleeve case.

[0004]

By the way, since the disk cartridge case constructed as the sleeve case as described above is formed by bending the sheet material, the thickness of the sheet material can be bent. It can be thickened only to a certain extent, and it is difficult to construct it as one having sufficient rigidity.

If the disc cartridge case does not have sufficient rigidity, the disc cartridge cannot be reliably protected. That is, even when the disc cartridge is stored in the disc cartridge case, if external pressure is applied,
Since the case for the disk cartridge is easily deformed, it may be damaged or deformed under the influence of the external pressure. Further, when a plurality of disc cartridges are stacked in a state where they are housed in the disc cartridge cases, the disc cartridge cases are deformed due to the weight of the disc cartridges, so that the disc cartridges are deformed or damaged. There is fear.

Further, in the above-mentioned disc cartridge case, since the accommodated disc cartridge is not locked in the accommodated state, the disc cartridge may come out of the disc cartridge case due to vibration or shock. There is If the disk cartridge comes out of the case during transportation of the disk cartridge housed in the disk cartridge case, the disk cartridge may fall onto the floor, and the disk cartridge may be damaged by an impact.

Further, since the disk cartridge case as described above is formed by bending the sheet material, the shape of the slit opening on the front side is unstable and easily deformed. Therefore, the operation of inserting the disc cartridge may be difficult.

Here, the disk cartridge case is treated like the cartridge of the disk cartridge.
It is conceivable that a member forming the top plate side and a member forming the bottom plate side are butted and coupled to each other. In this case, since each of these members is integrally formed by means such as injection molding, there is no processing such as bending. Therefore, each of these members can be formed of a material having sufficiently high rigidity.

However, if the members forming the disk cartridge case are joined by screwing, the disk cartridge case has a complicated structure and a screw allowance is provided at a position not overlapping the disk cartridge. Since it is necessary, the top plate and the bottom plate need to be made larger than the disk cartridge.

If the above-mentioned members are joined by so-called ultrasonic fusion, the surface portions of these members may be damaged due to the propagation of ultrasonic waves, which is inconvenient as a case as a so-called external component. is there. Further, when performing the ultrasonic fusion, the so-called fusion rib portion, which is a portion where the above-mentioned members are joined, may be scraped, and powder may be generated. If such powder is generated, there is a risk that this powder will enter the disk cartridge housed in this disk cartridge case. If this powder enters the disc cartridge, the recording and / or reproduction of the information signal on the recording disc in the disc cartridge cannot be performed well. Further, the above members joined by ultrasonic fusion may not be sufficiently ensured in the environment of high temperature and high humidity, and there is a risk that they may be separated from each other.

When the above-mentioned members are joined by using a so-called adhesive, it takes a certain time for the adhesive to harden after the members are joined, and rapid joining cannot be performed. Further, in this case, it is necessary to control the application amount of the adhesive so that the adhesive does not extend to the outer side from between the respective members, which complicates the work. Further, in this case, in particular, complicated management of the storage of the adhesive is required so that the unused adhesive is not hardened and the adhesive strength is not deteriorated. The members joined by the adhesive may not be sufficiently ensured in the environment of high temperature and high humidity and may be separated from each other.

Further, since the member forming the top plate side and the member forming the bottom plate side are thin plate-shaped as a whole, when they are formed by injection molding, the deformation in the cooling step after the injection step may be large. There is. When the injection gates are arranged on the main surface portions of the member forming the top plate side and the member forming the bottom plate side, this deformation is such a curve that the main surface portion of these members bulges toward the injection gate side or the peripheral side portion. There are so-called sink marks in. In order to prevent sink marks on the peripheral side of each member, it is necessary to increase the injection pressure in the injection molding process. However, when this injection pressure is increased, stress concentrates around the injection gate, and the main surface portion The curvature of the becomes larger.

If the deformation of the first and second members in the cooling step is large or the deformed state of each of these members is different, it becomes difficult to butt-join these members to each other, and moreover, the precise shape is required. The disk cartridge case cannot be constructed.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, has sufficient rigidity, can reliably protect the disk cartridge to be housed, and is simple to assemble and manufacture. An object of the present invention is to provide a disk cartridge case that can be satisfactorily processed in the process.

[0015]

In order to solve the above problems and achieve the above objects, a disk cartridge case according to the present invention is provided with a top plate portion, both side portions and a rear side portion of a lower surface portion of the top plate portion. Partly formed by injection molding of a synthetic resin material having side walls protruding downward and at least engaging projections protruding on the lower ends of the side walls of both side parts. First member, a bottom plate part having substantially the same shape as the top plate part, side wall parts protruding upward on both side parts and a rear side part of an upper surface part of the bottom plate part, and at least both side parts A second member integrally formed by injection-molding a synthetic resin material, the engaging member protruding from the upper end of the side wall portion of the portion, and the first and second members.
When the side wall portions are overlapped with each other and the engaging protrusions are engaged with each other to make the top plate portion and the bottom plate portion parallel to each other, the top plate portion and the bottom plate portion are About a virtual plane parallel to the top plate portion in the middle of between,
The injection gate marks are provided at positions that are substantially symmetrical to each other.

Further, according to the present invention, in the above-mentioned disc cartridge case, the first and second members each have an injection gate mark on a central axis line at a substantially equal distance from the side wall portions on both sides. It was done like this.

Further, according to the present invention, in the above-mentioned disk cartridge case, the first and second members are:
Each has an injection gate mark at a position where the distance to any one of the side wall portions is 20 mm or less.

[0018]

In the disk cartridge case according to the present invention, there is provided a first member having a top plate portion and side wall portions on both side and rear side portions, and a bottom plate portion and side wall portions on both side and rear side portions. And a second member having a pair of side walls when they are engaged with each other so that the top plate portion and the bottom plate portion are parallel to each other, the second member having a substantially middle portion between the top plate portion and the bottom plate portion. The injection gate traces are provided at positions that are substantially symmetrical to each other with respect to an imaginary plane parallel to the top plate portion.
That is, in the first and second members, in the injection molding process, the portions corresponding to each other of the top plate portion and the bottom plate portion and the side wall portions to be overlapped with each other are arranged at substantially the same distance from the injection gate. Therefore, the deformation states in the cooling process are almost equal.

Further, in the above-mentioned disc cartridge case, when the first and second members have injection gate marks on the central axis which is substantially equal in distance from the side wall portions on both sides, respectively. The deformed states of the side wall portions on both sides of each of these members in the cooling step can be made substantially equal.

Further, in the above-mentioned disc cartridge case, the first and second members are respectively
When the injection gate mark is provided at a position where the distance to any of the side wall portions is 20 mm or less, the top plate portion of the first member and the bottom plate portion of the second member are molded into a good flat plate state. can do.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the disc cartridge case according to the present invention is a case for accommodating a disc cartridge 101 configured by accommodating a recording disc 117 such as an optical disc or a magneto-optical disc in a cartridge 102.

The disk cartridge 101 is shown in FIG.
As shown in FIG. 2, the upper and lower halves 103 and 104 are butted and joined to each other to form a thin casing, and the recording disk 117 rotatably accommodated in the cartridge 102. Has been done.

The recording disk 117 has a disk-shaped disk substrate made of a synthetic resin material, and a signal recording layer adhered and formed on the main surface of the disk substrate. The recording disk 117 has a chucking hole 114 formed in the central portion thereof, and a peripheral portion of the chucking hole 114 on one main surface portion of the disk substrate serves as a chucking reference surface portion 116. Has been done. A chucking plate 115 made of a metal material is attached to the other main surface portion of the disk substrate so as to close the chucking hole 114.

The cartridge 102 is formed in the shape of a thin casing having a substantially rectangular main surface portion whose one side corresponds to the diameter of the recording disk 117. On the upper and lower main surface portions of the cartridge 102, a pair of substantially rectangular recording and reproducing openings 106 and 107 are formed at positions facing each other. The recording / reproducing opening 107 provided in the lower half 104 exposes a part of one main surface portion of the recording disk 117 to the outside along the inner and outer circumferences. The recording / reproducing opening 106 provided in the upper half 103 exposes a part of the other main surface portion of the recording disk 117 to the outside along the inner and outer circumferences.

Each of the recording / reproducing openings 106, 107
Can be opened and closed by a shutter member 105 slidably attached to the cartridge 102. The shutter member 105 is formed by bending a material such as a thin metal plate into a substantially U-shape and has a pair of shutter plate portions corresponding to the recording / reproducing openings 106 and 107. .. The shutter plate portions are arranged such that one end side portions thereof are connected to each other by the central portion of the shutter member 105 and are opposed to each other in parallel. The shutter member 105 has a central portion slidably supported on one side surface portion of the cartridge 102, and the shutter plate portions are arranged along the main surface portions of the cartridge 102. The shutter member 105 has the shutter plate portions and the recording / reproducing opening portions 106, 10
By setting the position corresponding to 7, the recording / reproducing openings 106 and 107 are closed. The shutter member 105 is, as shown by an arrow B in FIGS. 1 and 2,
The respective shutter plate portions are moved to the rear side on the main surface portion of the cartridge 102 by being slid to the rear side with respect to the inserting operation direction of the disc cartridge 101 into the recording / reproducing apparatus or the like indicated by the arrow A in FIG. The recording / reproducing openings 106 and 107 are opened.

Further, the cartridge 102 is provided with a circular chucking opening 108 at the central position of the lower main surface portion. This chucking opening 1
Reference numeral 08 exposes the chucking hole 114, the chucking reference surface portion 116, and the chucking plate 115 to the outside.

A pair of positioning holes 112 and 113 for positioning the cartridge 102 in the recording / reproducing apparatus are provided on the lower main surface of the cartridge 102. These positioning holes 112 and 113 are provided so as to be distributed near the front end portion and the rear end portion of the lower main surface portion of the cartridge 102.

Further, a pair of clamping recesses 110 and 109 are formed on the lower main surface of the cartridge 102.
Also, a disc type identifying recess 111 is provided.
These clamping recesses 110 and 109 are provided on the front side of the lower main surface portion of the cartridge 102 and distributed on both sides. These clamping recesses 11
0 and 109 are open to one side surface and the other side surface of the cartridge 102, respectively. The disc type identifying recess 111 is provided on the front side of the lower main surface portion of the cartridge 102. The disc type identifying recess 111 is opened to the front end surface of the cartridge 102. This disc identifying recess 111
In order to indicate the type of the recording disk 117, is formed to have one of a plurality of depths determined corresponding to the plurality of types.

The disc cartridge case according to the present invention, as shown in FIGS.
Top plate member 1 which is a member and bottom plate member 2 which is a second member
And is configured.

The top plate member 1 includes the cartridge 10
The main plate 2 has a top plate portion 1a having a shape and size substantially corresponding to the shape and size of the main surface portion 2, and is formed to have a substantially flat plate shape. The top plate member 1 is integrally formed of a synthetic resin material by an injection molding process. The top plate member 1 is made of, for example, a transparent material such as so-called acrylic resin (polymethylmethacrylate or the like), ABS resin, polycarbonate, polystyrene or the like.

As shown in FIG. 8, the top plate member 1 has a pair of inner side wall parts 11 and 12 on both sides of the lower surface, which are parallel to the side edges of the top plate part 1a. .. Further, the top plate member 1 has the top plate portion 1a on the rear side portion of the lower surface portion.
It has an inner rear wall portion 15 which is a side wall portion parallel to the rear edge portion. The inner side wall portions 11 and 12 and the inner rear wall portion 1
The reference numeral 5 is integrally formed with the top plate portion 1a, and is continuously provided to form a U-shaped peripheral wall excluding the front side.
The inner side wall portions 11 and 12 and the inner rear wall portion 15 are
The cartridge 102 is provided so as to have a height substantially equal to the thickness of the cartridge 102. In addition, each of these inner side wall portions 11, 1
2 and the inner rear wall portion 15 are formed so as to be positioned inward from both side edge portions and the rear edge portion of the top plate portion 1a by an amount corresponding to the thickness of each of the wall portions 11, 12, and 15. ing.

8, 9, and 19 are formed on the outer side surface portions of the inner side wall portions 11 and 12 which are separated from each other.
Also, as shown in FIG. 20, side engaging projections 13 and 14 that serve as engaging projections are provided so as to protrude outwardly correspondingly. These side engaging protrusions 13 and 14 extend from the vicinity of the front end of each of the inner side wall portions 11 and 12 to the rear end side,
The top plate portion 1a is provided so as to extend in parallel to both side edge portions and project. These side engaging ridges 13 and 14 are slightly above the lower end portions of the inner side wall portions 11 and 12, that is,
It is formed so as to be located on the side closer to the top plate portion 1a. Further, a rear engagement protrusion 16 that serves as an engagement protrusion is provided on the outer side of the inner rear wall portion 15, that is, on the rear side surface portion so as to protrude rearward. This rear engagement ridge 16
Is from one side of the inner rear wall portion 15 to the other side thereof,
The top plate portion 1a is provided so as to extend in parallel to the rear side edge portion and project. The rear engagement protrusion 16 is provided on the inner rear wall portion 15
Is formed at a position slightly above the lower end of the above, that is, on the side closer to the top plate 1a.

On the outer side surfaces of the inner side wall portions 11 and 12, locking projections 23 and 24 are provided so as to project outward in a corresponding manner. These locking protrusions 23 and 24 are provided on the front side of the inner side wall portions 11 and 12 and adjacent to the upper surfaces of the side engaging protrusions 13 and 14, respectively. These locking projections 23, 24
Is formed to have a slightly smaller amount of protrusion than the side engaging protrusions 13 and 14. These locking projections 23, 2
4, the front end surface is substantially perpendicular to the inner side wall portions 11 and 12, and the rear end surface is the inner side wall portions 11 and 1.
The shape is inclined with respect to 2, and the amount of protrusion is gradually reduced toward the rear side.

A pair of vertical groove portions 39, 40 are provided at the rear side positions of the outer side surface portions of the inner side wall portions 11, 12, respectively. These vertical groove portions 39 and 40 extend from the base end side to the lower end side of each of the inner side wall portions 11 and 12,
That is, it is formed from the lower surface portion of the top plate portion 1a to near the lower end portions of the inner side wall portions 11 and 12.

On the lower surface of the top plate 1a, a pair of lateral step portions 48 and 49 and a rear step portion 50 which are bulged like steps are formed at both side positions and rear position. .. These step portions 48, 49, 50 are formed with a slight amount of bulge, and when the disc cartridge 101 is inserted into the disc cartridge case, the disc cartridge 101 serves as the top plate portion 1a. This is to prevent sliding contact with the central portion.

An upper notch 5 is formed at the front end of the top plate 1a. The upper notch 5 is for exposing the rear end side portion of the disc cartridge 101 housed in the disc cartridge case to the outside.

As shown in FIG. 21, a mold device for injection molding the top plate member 1 has a single pin injection gate 2.
It is configured by including 07. This mold device
It is configured to have an upper mold 201 and a lower mold 202. The lower mold 202 has support bolts 212, 2 mounted on a base 213.
It is supported via 12. The upper mold 201 is placed on the lower mold 202, and the lower mold 202 is
Is matched to. In addition, the slider core 2 is inserted so as to be inserted between the molds 201 and 202 from the lateral side.
03 is provided. These upper mold 201 and lower mold 202
The slider core 203 and the slider core 203 form a molding cavity 204 therebetween. This molding cavity 204 is
It is a void corresponding to the shape of the top plate member 1. The upper mold 201 forms the top surface of the molding cavity 204. The lower mold 202 forms the bottom surface of the molding cavity 204. Further, the slider core 203 forms a side surface portion of the molding cavity 204 which is a portion corresponding to the outer side surface portion of the inner rear wall portion 15.

An injection cylinder 208 is arranged in the upper mold 201 so as to penetrate the upper mold 201. The injection cylinder 208 is arranged from the upper side of the upper mold 201 to the vicinity of the molding cavity 204. A cylinder 205 for sending the melted synthetic resin material is disposed in the injection cylinder 208. The cylinder 205 is arranged over the top surface of the molding cavity 204 by a synthetic resin melting device (not shown). As shown by an arrow K in FIG. 21, the synthetic resin material forming the top plate member 1 is melted and fed into the cylinder 205 by the synthetic resin melting device. And
The tip side of the cylinder 205 is the pin injection gate 2
It is communicated with the inside of the molding cavity 204 via 07. In the cylinder 205, the injection shaft 2
06 is provided. The injection shaft 206 is arranged with its tip end facing the pin injection gate 207, and is arranged so that it can be moved forward and backward with respect to the pin injection gate 207. The injection shaft 206 is advanced to the pin injection gate 207 side as shown by an arrow J in FIG. 21, whereby the molten synthetic resin material stored in the cylinder 205 is transferred to the molding cavity 2
It is injected in 04 at a predetermined injection pressure.

Further, the lower mold 202 has the lower mold 20.
2 is inserted into the insertion hole 210 penetrating the
The push pin 211 is provided. The insertion hole 210
Are arranged from the lower side of the lower mold 202 to the bottom surface of the molding cavity 204. The push-out pin 211 is arranged with its tip end facing the bottom surface of the molding cavity 204, and is arranged so that it can be moved back and forth in the molding cavity 204. As shown by an arrow H in FIG. 21, the push-out pin 211 is advanced to the molding cavity 204 side to push up the cured top plate member 1 in the molding cavity 204, and Separated from the lower mold 202.

In order to mold the top plate member 1 in such a mold apparatus, the compound melted in the molding cavity 204 by the injection shaft 206 through the cylinder 205 and the pin injection gate 207. Resin material is injected. The molding cavity 204 is cooled by a so-called mold clamping process in which the upper mold 201 and the lower mold 202 are pressed against each other and then cooled.
The synthetic resin inside cures to become the top plate member 1. Then, the top plate member 1 is moved from the lower mold 202 by the pushing pin 211 after the mold opening for moving the slider core 203 to the side and separating the upper mold 201 and the lower mold 202 from each other. It is released from the mold.

In the top plate member 1 formed by such a mold device, as shown in FIGS. 1, 5, 7, 8 and 20, the center of the upper surface of the top plate portion 1a is used. A first injection gate mark G ₁ is formed at a position on the slightly rear side where the synthetic resin material was introduced from the pin injection gate 207. That is, this first injection gate mark G
₁ is formed on the central axis line having a substantially equal distance from the inner side wall portions 11 and 12, and at a position where the distance to the inner rear wall portion 15 shown by an arrow E in FIG. 20 is 20 mm or less. Has been done.

In the top plate member 1, in the step of injecting the synthetic resin material, the molten synthetic resin material flows as indicated by arrows Z _{1 to} Z ₈ in FIG. At this time,
The synthetic resin material has a direction from the inner rear wall portion 15 shown by arrows Z ₁ and Z ₅ in FIG. 8 to one inner side wall portion 11, and the inner rear wall portion shown by arrows Z ₂ and Z ₆ in FIG. Since it flows well in the direction from the wall portion 15 to the other inner side wall portion 12, even if the injection pressure to the synthetic resin material is low, the inner rear wall portion 15 and the inner side wall portions 11,
Does not cause so-called sink marks in 12. Further, in the top plate member 1, since the injection pressure to the synthetic resin material is low in the injection step of the synthetic resin material,
The occurrence of bending of the top plate portion 1a in the cooling step is suppressed. Further, since the first injection gate trace G ₁ is formed on the central axis line having a substantially equal distance from the inner side wall portions 11 and 12, in the cooling process of the respective inner side wall portions 11 and 12. The deformation states are equal to each other. In addition, in the top plate member 1, the occurrence of so-called weld lines is suppressed because the first injection gate trace G ₁ is provided at one location.

On the other hand, the bottom plate member 2 includes the bottom plate portion 1a.
Has a bottom plate portion 2b having substantially the same shape as that of the above, and has a substantially flat plate shape, and is integrally formed of a material such as a synthetic resin. The bottom plate member 2 is formed of a material having good heat resistance such as heat-resistant ABS resin and polycarbonate.

As shown in FIG. 7, the bottom plate member 2 has a pair of outer side wall portions 17 and 18 on both side portions of the upper surface portion in parallel with the side edge portions of the bottom plate portion 2a. Further, the bottom plate member 2 has the bottom plate portion 2a at the rear side portion of the upper surface portion.
It has an outer rear wall portion 19 which is a side wall portion parallel to the rear edge portion. These outer side wall parts 17 and 18 and the outer rear wall part 1
9 are integrally formed with the bottom plate portion 2a and are connected to each other to form a U-shaped peripheral wall excluding the front side.
The inner side wall portions 22, 22 and the inner rear wall portion 25 are
The cartridge 102 is provided so as to have a height substantially equal to the thickness of the cartridge 102. Further, each of these outer side wall portions 17, 1
8 and the outer rear wall portion 19 are formed along both side edge portions and the rear edge portion of the bottom plate portion 2a.

As shown in FIGS. 10, 17 and 18, side engaging grooves 20 and 21 are formed on the inner side surfaces of the outer side wall portions 17 and 18, which are opposite to each other. Correspondingly, it is formed toward the inner side. The side engaging grooves 20 and 21 are provided in parallel with the upper surface portion of the bottom plate portion 2a from the vicinity of the front end portion of each of the outer side wall portions 17 and 18 to the rear end side. These side engaging grooves 2
0 and 21 are formed slightly above the base end portions of the outer side wall portions 17 and 18, that is, at positions slightly separated from the bottom plate portion 2a. These side engaging grooves 20, 21
The upper part of is an engaging protrusion. Further, the outer rear wall portion 1
On the inner side of 9, ie, the side surface on the front side, a flange portion 22 serving as a rear engagement protrusion is provided so as to protrude toward the front side. The brim portion 22 extends from one side of the outer rear wall portion 19 to the other side thereof, along the upper edge of the outer rear wall portion 19 and in parallel with the upper surface portion of the bottom plate portion 2a. It is set up. The lower side of the collar 22 and the bottom plate 2a are
It constitutes a rear engagement groove.

Further, locking recesses 25 and 26 are provided on the inner side surfaces of the outer side wall parts 17 and 18 so as to open inwardly correspondingly. These engaging recesses 25 and 26 correspond to the engaging protrusions 23 and 24,
It is provided at a position on the front side of each of the outer side wall portions 17 and 18 so as to communicate with the upper side of each of the side engaging grooves 20 and 21. These locking recesses 25 and 26 are provided in the side engaging grooves 2 described above.
It is formed to have a depth slightly shallower than 0 and 21.

Concave portions 37 and 38 are formed on the upper edges of the outer side surface portions of the outer side wall portions 17 and 18, respectively. These recesses 37, 38 are formed in a step shape along the upper edge of each outer side wall portion 17, 18 from the front end portion to the rear end portion of each outer side wall portion 17, 18. These recesses 3
The upper side of 7, 38 is open to the upper edge side of each of the outer side wall portions 17, 18.

A pair of notches 41 and 42 are provided at the rear side positions of the outer side wall portions 17 and 18, corresponding to the vertical groove portions 39 and 40, respectively. These cutout portions 41, 42 are formed by the outer side wall portions 17,
It is formed from the upper end of 18 toward the base end side.

A lower cutout 6 is formed on the front end side of the bottom plate 2a. The lower notch 6 is for exposing the rear end side portion of the disc cartridge 101 housed in the disc cartridge case to the outside.

On the bottom plate portion 2a, a pair of side step portions 3 bulged in a step shape at both side positions and rear side positions.
0, 31 and a rear step portion 32 are formed. These step portions 30, 31, 32 are formed so as to have a slight bulge amount, and when the disc cartridge 101 is inserted into the disc cartridge case, the disc cartridge 101 is located at the center of the bottom plate portion 2a. This is to prevent sliding contact with the portion.

An erroneous insertion prevention protrusion 29 is provided on the rear step portion 32. The erroneous insertion preventing protrusion 29 is formed at a position slightly displaced to the one side from the central position of the rear portion of the bottom plate portion 2a, and is provided at a position corresponding to the disc identifying recess 111 of the disc cartridge 101. Has been.

At both ends of the collar portion 22, a pair of rib-shaped reinforcing portions 27, which are continuous with the collar portion 22, are provided.
28 is provided. These reinforcing portions 27, 28 are protrusions integrally formed on the inner surface of the outer rear wall portion 19, and are provided from the collar portion 22 to the bottom plate portion 2a. Then, the side engaging grooves 20,
A plurality of reinforcing ribs 43 are provided on the lower side of the inside of the side wall 21 from the side surface portion inside the side engaging grooves 20 and 21 to the bottom plate portion 2a.
Is provided.

Then, the top plate member 1 and the bottom plate member 2
As shown in FIG. 11, each of the side engaging ridges 13, 1
4 engages with the respective side engaging grooves 20 and 21, and FIG.
As shown in FIG. 2, the rear engagement protrusion 16 is provided with the collar portion 22.
And the bottom plate portion 2a, that is, by fittingly engaging with the rear engagement groove, they are joined to each other. The top plate member 1 and the bottom plate member 2 are joined to each other by positioning the top plate member 1 on the front side of the bottom plate member 2 and arranging the side engaging projections 1 described above.
The rear end sides of the side engaging grooves 3 and 14 are inserted into the front sides of the side engaging grooves 20 and 21, and then the top plate member 1 is moved to the rear side so that the side engaging protrusions 13 and 14 is performed by sliding the inside of each of the side engaging grooves 20 and 21. When the top plate member 1 is slid to a position where the top plate portion 1a faces the bottom plate portion 2a, the rear engagement protrusion 16
Engages in the rear engagement groove, and the locking projections 23 and 24 fit into the locking recesses 25 and 26, respectively. When the locking projections 23, 24 are fitted into the locking recesses 25, 26, the locking projections 23, 24
24, first, enters between the outer side wall portions 17 and 18 from the front end side of the respective outer side wall portions 17 and 18, and pushes the outer side wall portions 17 and 18 outward so as to be slightly flexibly displaced. Next, when the outer side wall portions 17 and 18 are returned to the initial state when they reach the positions facing the locking recesses 25 and 26, they are fitted into the locking recesses 25 and 26.

Then, the top plate member 1 and the bottom plate member 2 are engaged with each other on both side portions and rear end side portions of the top plate portion 1a and the bottom plate portion 2a, respectively. The bottom plate portions 2a are parallel to each other, and a slit-shaped opening is formed on the front side. The slit-shaped opening has a length approximately corresponding to the length of one side of the cartridge 102, and a width approximately corresponding to the thickness of the cartridge 102. At this time, the lower ends of the inner side wall portions 11 and 12 and the inner rear wall portion 15 are in contact with the upper surface portion of the bottom plate portion 2a. The upper end portions of the outer side wall portions 17 and 18 and the outer rear wall portion 19 are in contact with the peripheral portion of the lower surface portion of the top plate portion 1a.

Further, the side groove portions 7 and 8 are formed by the concave portions 37 and 38 formed on the upper end side of the outer side surface portions of the outer side wall portions 17 and 18 and the vicinity of both side edge portions of the top plate portion 1a. There is. That is, as shown in FIG. 11, the upper end edges of the outer side wall portions 17 and 18 are apart from the lateral side edge portions of the top plate portion 1a by a distance corresponding to the depth of the recesses 37 and 38. It is in contact with the inner side position. The side groove portions 7 and 8 are formed from the front end side to the rear end side of the side surface portion of the disk cartridge case. At the rear side positions of the bottoms of the side groove portions 7 and 8, the notch portions 41 and 42 provided in the outer side wall portions 17 and 18 and the vertical portions formed in the inner side wall portions 11 and 12 are formed. Grooves 39, 4
The bottomed holes constituted by 0 and 0 are respectively located.

A mold device for injection molding the bottom plate member 2 is equipped with a single pin injection gate, like the mold device for injection molding the top plate member 1 shown in FIG. It is composed. In the bottom plate member 2 formed by such a mold device, as shown in FIG. 3, FIG. 7 and FIG. A second injection gate mark G ₂ is formed at the position where the synthetic resin material was introduced. That is, the second injection gate mark G ₂ is
It is formed on the central axis line having a substantially equal distance from the outer side wall portions 17 and 18, and at a position where the distance to the outer rear wall portion 19 shown by an arrow C in FIG. 17 is 20 mm or less. ..

In this bottom plate member 2, in the step of injecting the synthetic resin material, the molten synthetic resin material flows as indicated by arrows W _{1 to} W ₈ in FIG. At this time,
This synthetic resin material has a direction from the outer rear wall portion 19 shown by arrows W ₁ and W ₅ in FIG. 7 to one outer side wall portion 17, and the outer rear wall portion shown by arrows W ₂ and W ₆ in FIG. Since it flows well in the direction from the wall portion 19 to the other outer side wall portion 18, even if the injection pressure to the synthetic resin material is low, the outer rear wall portion 19 and the outer side wall portions 17,
Does not cause so-called sink marks in 18. In the bottom plate member 2, since the injection pressure of the synthetic resin material in the injection step of the synthetic resin material is low,
The occurrence of bending of the bottom plate portion 2a in the cooling step is suppressed. Further, since the second injection gate mark G ₂ is formed on the central axis line having a substantially equal distance from the outer side wall portions 17 and 18, the outer side wall portions 17 and 18 are cooled in the cooling step. The deformation states are equal to each other. In addition, in the bottom plate member 2, since the second injection gate trace G ₂ is provided at one place, the occurrence of so-called weld line is suppressed.

In this disc cartridge case, the top plate member 1 and the bottom plate member 2 have shapes similar to each other, and when the side wall portions of the top plate member 1 and the bottom plate member 2 are butt-joined to each other, the traces of the ejection gates of the respective cases are provided. G ₁ , G ₂
Is a mirror image position with the abutting surface as a boundary, that is, a position symmetrical to each other with respect to a virtual plane parallel to the top plate portion 1a which is substantially intermediate between the top plate portion 1a and the bottom plate portion 2a. It is designed to face each other. Therefore, the top plate member 1 and the bottom plate member 2 have substantially the same deformed state such as contraction in the cooling step in the injection molding step, and the engaging protrusions of the side wall portions can be smoothly engaged with each other. It is done like this.

At a position on the inner side of the slit-shaped opening, that is, between the members 1 and 2, a pair of disk cartridges 101 inserted between the members 1 and 2 are locked. Lock members 9 and 10 are provided. These locking members 9 and 10 are made of polyacetal (P
As shown in FIGS. 13 to 16, the material to be held 44 on both ends is made of a flexible and elastic material such as OM).
It has 45 and the elastic arm part 46 which extends between these held parts 44 and 45, and is integrally formed. Each of the held portions 44 and 45 is formed in a substantially columnar shape and has axes parallel to each other. The elastic arm portion 46 is formed in a curved arm shape extending between the peripheral side surface portions of the held portions 44 and 45. The elastic arm portion 46 is curved and formed in a direction orthogonal to the axial center of each of the held portions 44 and 45, and the apex of the bulging portion formed by the bending is formed on the held portions 44 and 45. On the other hand, the position is equidistant. This locking member 9,1
The bulging portion formed by the curve of 0 serves as a locking surface portion 47 for locking the disc cartridge 101.

Each of the lock members 9 and 10 has a pair of lock member mounting portions 33 and 34 formed on the bottom plate member 2.
Each of them is held and attached to. As shown in FIG. 17, the lock member mounting portions 33 and 34 are formed on the inner side portions of the outer side wall portions 17 and 18 which face each other, and are located on the rear side of the outer side wall portions 17 and 18. ing. The lock member attachments 33 and 34 have a pair of front and rear holding protrusions 54 and 55, respectively. The holding projections 54 and 55 are provided so as to project inward from the lower portions of the outer side wall portions 17 and 18, respectively, and are continuous with the bottom plate portion 2a. That is, these holding projections 5
4, 55 are provided at the corners between the outer side wall portions 17 and 18 and the bottom plate portion 2a. These holding protrusions 54,
55 are formed facing each other with a distance substantially corresponding to the lengths of the lock members 9 and 10. These holding projections 54, 55 are provided on the opposite sides of the holding recess 5
It has 2,53. These holding recesses 52 and 53 are
The recess is open to the upper side, and the cross-sectional shape thereof is an ellipse having a major axis in the front-rear direction or a part of an ellipse. The lock members 9 and 10 are held by the holding protrusions 54 and 55 by fitting the held portions 44 and 45 into the holding recesses 52 and 53, respectively.

The lock members 9 and 10 are such that the axes of the held portions 44 and 45 are perpendicular to the bottom plate portion 2a, and the locking surface portion 47 faces the inner side of the bottom plate portion 2a. ing. That is, the curved arm portions 46 of the lock members 9 and 10 are configured to bulge inward of the bottom plate portion 2a. And these lock members 9 and 10
Are the outer side wall portions 17 of the curved arm portions 46,
Elastic displacement in a direction approaching 18 is possible. When the bending arm portion 46 is elastically displaced in this manner, the held portions 44 and 45 are retained by the holding recesses 5 respectively.
It is moved in the front-back direction within 2, 53.

On the other hand, the inner side wall portions 11 and 12 of the top plate member 1 are notched at the rear side portions, and the rear side portions have a length corresponding to the width of the lock members 9 and 10. However, the hanging distance from the top plate portion 1a is shorter than that of the central portion and the front side portion. That is, the inner side wall portions 11 and 12 have the lock member holding portions 33 and 34, respectively.
The lock members 9 and 10 held by the lock member 9 and 10 are prevented from coming into contact with the lock members 9 and 10, and the lock members 9 and 10 are prevented from coming off from the lock member holding portions 33 and 34.

The lock member mounting portions 33 and 3 are provided.
A so-called sink mark is likely to occur when the bottom plate member 2 is integrally formed by injection molding on the back side of 4, that is, the rear side position on the outer side of each of the outer side wall portions 17 and 18.
In the sink mark, since the portions where the lock member attachment portions 33 and 34 are provided are thicker than the other portions of the outer side wall portions 17 and 18, the portions are inward in the cooling step during molding. It occurs when it collapses to the side. In order to prevent the occurrence of such sink marks, the positions corresponding to the lock member mounting portions 33, 34 of the outer side wall portions 17, 18 are provided with meat escape holes 35, 36 so as to be in a hollow state. There is.

In order to store and hold the above-mentioned disc cartridge 101 by the disc cartridge case according to the present invention constructed as described above, the top plate portion 1a is used.
As shown by an arrow A in FIG. 1, the disc cartridge 101 is inserted from the front portion between the bottom plate portion 2a and the bottom plate portion 2a through the slit-shaped opening portion.

When the front portion of the disc cartridge 101 reaches the rear side of the disc cartridge case, both side surface portions of the front portion of the cartridge 102 are
The locking surface portions 47, 47 of the lock members 9, 10 are pressed to displace the curved arm portions 46, 46 in a direction of approaching the outer side wall portions 17, 18. And
When the front end of the cartridge 102 is inserted to a predetermined position where the front end of the cartridge 102 abuts the inner side wall 15 of the disk cartridge case, the locking members 9 and 10 correspond to the clamping recesses 110 and 109. To face each other. At this time, the curved arm portions 46, 46 of the lock members 9, 10 are returned to the initial state by the elastic force, and the locking surface portions 47, 47 are fitted into the clamping recesses 110, 109, respectively. .. As described above, the locking surface portions 47, 47 of the lock members 9, 10 are fitted into the clamping recesses 110, 109, respectively, so that the cartridge 102 is locked, and the cartridge 102 is locked on the rear side by impact or vibration. That is, the movement in the direction in which the disk cartridge case is pulled out to the outside through the slit-shaped opening is restricted.

At this time, the erroneous insertion preventing projection 29 is also provided.
Is fitted in the disc identifying recess 111 of the disc cartridge 101.

The disc cartridge 101, which has been set at the predetermined position in the disc cartridge case as described above, is housed between the members 1 and 2 and protected by the members 1 and 2.

To take out the disc cartridge 101 housed in the disc cartridge case from the disc cartridge case, the cartridge 102 facing the outside through the upper and lower cutouts 5 and 6 is taken out. The rear portion of the disk cartridge is grasped with fingers and the like, and is pulled rearward with respect to the disk cartridge case.
Then, the lock members 9 and 10 are engaged with the locking surface portions 47 and 47 by the both side portions of the front portion of the cartridge 102.
Is pressed to displace the curved arm portions 46, 46 in a direction of approaching the outer side wall portions 17, 18 to unlock the cartridge 102. At this time, the disc cartridge 101 can be taken out from the disc cartridge case through the slit-shaped opening. And
When the cartridge 102 is further moved to the rear side, the lock members 9 and 10 are returned to the initial state, and the disc cartridge 101 is pulled out to the outer side of the disc cartridge case.

In the disc cartridge case according to the present invention, the side wall portions on the inner side, that is, the inner side wall portions 11 and 12 and the inner rear wall portion 15 in the above-mentioned embodiment are the same as those in the above-mentioned embodiment. The side wall does not have to be a continuous side wall as shown therein, and may be a side wall formed discretely with one or more notches.

Further, in this disc cartridge case, the top plate member 1 and the bottom plate member 2 are not limited to the configurations shown in the above-mentioned embodiments, and are not limited to FIGS.
20, the positions of the injection gate traces G ₁ and G ₂ are indicated by the arrow F in FIG. 20 or the arrow D in FIG. 17, the one inner side wall portion 11 or the one outer side wall portion 1 respectively.
It may be formed such that the distance to 7 is 20 mm or less. Also in this case, when the side wall portions of the top plate member 1 and the bottom plate member 2 are butt-joined to each other, the injection gate traces G ₁ and G ₂ respectively have the top plate portion 1a and the bottom plate. The top plate portion 1 approximately in the middle between the portions 2a
Since the imaginary planes parallel to a are opposed to each other at positions symmetric to each other, the deformed states such as shrinkage in the cooling step during injection molding are substantially equal to each other. Therefore, the top plate member 1 and the bottom plate member 2 can smoothly engage the engaging protrusions of the side wall portions with each other.

Further, in this disc cartridge case, the top plate member 1 and the bottom plate member 2 are the same as those shown in FIG.
As shown in FIGS. 7 to 30, each of the injection gate traces G ₁ ,
The position of G ₂ is formed such that the distance to the other inner side wall portion 11 or the other outer side wall portion 17 shown by arrow F in FIG. 20 or arrow D in FIG. 17 is 20 mm or less. May be. Also in this case, when the side wall portions of the top plate member 1 and the bottom plate member 2 are butted and joined to each other, the injection gate marks G ₁ and G respectively possessed by the top plate member 1 and the bottom plate member 2 are provided.
_{Since the two} are opposed to each other at positions that are symmetrical to each other with respect to an imaginary plane parallel to the top plate portion 1a substantially in the middle between the top plate portion 1a and the bottom plate portion 2a, shrinkage in the cooling step during injection molding Deformation states such as "substantially" are almost equal to each other. Therefore, the top plate member 1 and the bottom plate member 2 can smoothly engage the engaging protrusions of the side wall portions with each other.

As the mold device, a device having a so-called film injection gate, submarine injection gate, or the like may be used instead of the pin injection gate 207. When the top plate member 1 is molded by such a mold device, the top plate member 1 has a third injection gate mark G ₃ on the inner rear wall portion 1 as shown in FIG.
5 can be molded as having. Further, when the bottom plate member 2 is molded by such a mold device, the bottom plate member 2 is, as shown in FIG. 31,
It can be molded as having a _fourth injection gate trace G ₄ on the outer rear wall portion 19.

In this case as well, the synthetic resin material forming the top plate member 1 and the bottom plate member 2 extends in the direction from the outer rear wall portion 19 to each of the outer side wall portions 17 and 18 and the inner rear wall portion. Since the fluid flows well from the portion 15 to the inner side wall portions 11 and 12, even if the injection pressure to the synthetic resin material is low, the rear wall portions 15 and 19 and the side wall portions 11 and 12 are formed. , 17 and 18 do not cause so-called sink marks. In this disc cartridge case, since the injection pressure of the synthetic resin material is low in the injection step of the synthetic resin material, it is possible to prevent the top plate portion 1a and the bottom plate portion 2a from being curved in the cooling step. You can Further, the top plate member 1 and the bottom plate member 2 have respective injection gate traces G ₃ and G ₄ when their side wall portions are butted and joined to each other.
Are symmetric with respect to an imaginary plane parallel to the top plate portion 1a substantially in the middle between the top plate portion 1a and the bottom plate portion 2a, so that the deformation state such as shrinkage in the cooling step during injection molding is They are almost equal to each other. Therefore, the top plate member 1 and the bottom plate member 2 can smoothly engage the engaging protrusions of the side wall portions with each other.

[0074]

As described above, in the disk cartridge case according to the present invention, the first member having the top plate and both side portions and the side wall portions of the rear side portion, the bottom plate portion and both side portions are provided. And a second member having a side wall portion on the rear side portion, when the side wall portions are overlapped and engaged with each other to make the top plate portion and the bottom plate portion parallel to each other, these top plate portions and The injection gate traces are provided at positions approximately symmetrical to each other with respect to an imaginary plane parallel to the top plate portion approximately in the middle between the bottom plate portions. That is, in the first and second members, in the injection molding process, the portions corresponding to each other of the top plate portion and the bottom plate portion and the side wall portions to be overlapped with each other are arranged at substantially the same distance from the injection gate. Was there. Therefore, the first and second members have substantially the same deformed state in the cooling step of the injection molding step.

Therefore, in this disc cartridge case, the first and second members can be easily engaged with each other.

Further, in the above-mentioned disc cartridge case, when the first and second members respectively have the injection gate marks on the central axis line which is substantially equal in distance from the side wall portions on both sides, The deformed states of the side wall portions on both sides of each of these members in the cooling step can be made substantially equal. Therefore, in this case, the first and second members can be more easily engaged with each other.

Furthermore, in the above-mentioned disc cartridge case, the first and second members are respectively
When the injection gate mark is provided at a position where the distance to any of the side wall portions is 20 mm or less, the top plate portion of the first member and the bottom plate portion of the second member are molded into a good flat plate state. can do.

That is, the present invention has sufficient rigidity,
The disk cartridge to be housed can be reliably protected, the assembly and manufacturing can be performed by simple steps, and a disk cartridge case having a good shape can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a disc cartridge case according to the present invention and a disc cartridge housed in the disc cartridge case.

FIG. 2 is a perspective view showing the configuration of the disc cartridge as viewed from the bottom side.

FIG. 3 is a plan view showing a configuration of the disc cartridge case.

FIG. 4 is a rear view showing the configuration of the disc cartridge case.

FIG. 5 is a bottom view showing the configuration of the disc cartridge case.

FIG. 6 is a front view showing a configuration of the disc cartridge case.

FIG. 7 is an exploded perspective view showing a configuration of the disc cartridge case.

FIG. 8 is a perspective view showing the configuration of a top plate member that constitutes the disc cartridge case, as viewed from the bottom surface side.

FIG. 9 is a side view showing the configuration of the top plate member.

FIG. 10 is a side view showing a configuration of a bottom plate member that constitutes the disc cartridge case.

FIG. 11 is an enlarged cross-sectional view of a main part showing an engagement state between the top plate member and the bottom plate member in the side of the disk cartridge case.

FIG. 12 is an enlarged sectional view of an essential part showing a state of engagement between the top plate member and the bottom plate member on the rear side.

FIG. 13 is a front perspective view showing the shape of a lock member that constitutes the disk cartridge case.

FIG. 14 is a perspective view showing the shape of the lock member as seen from the back side.

FIG. 15 is a plan view showing the shape of the lock member.

FIG. 16 is a side view showing the shape of the lock member.

FIG. 17 is a plan view showing the shape of a bottom plate member that constitutes the disc cartridge case.

FIG. 18 is a front view showing the shape of the bottom plate member.

FIG. 19 is a front view showing the shape of a top plate member that constitutes the above-mentioned disc cartridge case.

FIG. 20 is a bottom view showing the shape of the top plate member.

FIG. 21 is a vertical cross-sectional view showing the structure of a mold for injection molding the top plate member.

FIG. 22 is a perspective view showing another example of the configuration of the disc cartridge case according to the present invention and the configuration of the disc cartridge.

23 is a plan view showing the structure of the disc cartridge case shown in FIG. 22. FIG.

24 is a rear view showing the configuration of the disc cartridge case shown in FIG. 22. FIG.

FIG. 25 is a bottom view showing the configuration of the disc cartridge case shown in FIG. 22.

FIG. 26 is a front view showing the structure of the disc cartridge case shown in FIG. 22.

FIG. 27 is a plan view showing still another example of the configuration of the disc cartridge case according to the present invention.

28 is a rear view showing the configuration of the disc cartridge case shown in FIG. 27. FIG.

29 is a bottom view showing the configuration of the disc cartridge case shown in FIG. 27. FIG.

30 is a front view showing the configuration of the disc cartridge case shown in FIG. 27. FIG.

FIG. 31 is an exploded perspective view showing a configuration when the disc cartridge case according to the present invention is formed by a mold device having a submarine injection gate.

32 is a perspective view of a top plate member forming the disc cartridge case shown in FIG. 31, viewed from the bottom side.

[Explanation of symbols]

1 --- ・ Top plate member 1a --- Top plate part 2 --- ・ Bottom plate member 2a ---・ ・ ・ Bottom plate 11,12 ・ ・ ・ ・ ・ Inner side wall 13,14 ・ ・ ・ ・ ・ ・ Side engagement ridge 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inside rear Wall part 16 --- .. Rear engaging protrusion 17, 18 ...- Outer side wall part 19 ---. Outer rear wall part 20 , 21 ・ ・ ・ ・ ・ ・ Side engaging groove 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Flange part 23, 24 ・ ・ ・ ・ ・ ・ Locking protrusion 25, 26 stop recess 101 ............ disk cartridge G ₁ .......... first injection gate mark G ₂ .......... second injection gate mark G ₄ of the injection gate mark G ₃ .......... third ----- ... fourth of the injection gate mark

Claims (3)

[Claims] 1. A top plate portion, side wall portions projecting downward on both side portions and a rear side portion of a lower surface portion of the top plate portion, and at least lower end sides of side wall portions of both side portion portions. A first member integrally formed by injection molding a synthetic resin material, and a bottom plate portion having substantially the same shape as the top plate portion, and an upper surface of the bottom plate portion. A side wall portion projecting upward on both side portions and a rear side portion of the portion, and an engaging projection protruding on the upper end side of the side wall portion of at least both side portions, A second member integrally formed by injection molding, wherein the first and second members are formed by stacking the side wall portions with each other and engaging the engaging protrusions with each other. When the top plate part and the bottom plate part are made parallel to each other, approximately the middle between the top plate part and the bottom plate part. For virtual plane parallel to the top plate portion, the case for a disc cartridge comprising a respective injection gate mark in a position to be substantially symmetrical to each other. 2. The disk cartridge case according to claim 1, wherein each of the first and second members has an ejection gate mark on a central axis which is substantially equal in distance from the side wall portions on both sides. .. 3. The first and second members are respectively located at a position where a distance to any one of the side wall portions is 20 mm or less,
The disk cartridge case according to claim 1, wherein the case has an ejection gate mark.