JP2002326694A - Disk containing case and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk containing case and its manufacturing method, whose disk holding portion is hardly broken and which has high reliability. SOLUTION: Each elastic member 44 is disposed in a region 45 between an inner circumferential surface formed by walls 38, which extends around a disk holding portion 35 and whose radius is larger than that of an outer circumferential surface of a disk-like recording medium 12, and the outer circumferential surface of the disk-like recording medium 12 in the state of being held by the disk holding portion 35. Accordingly, even in the case where a shock is applied to the disk-like recording medium 12, the disk-like recording medium 12 abuts against the elastic members 44. As a result, the shock is absorbed by the elastic members 44, and a shock to be applied to the disk holding portion 35 from the disk-like recording medium 12 is relieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk storage case for storing a disk as a recording medium or the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 9 shows a disk storage case as a first conventional example of the present invention. The disk storage case 11 is used for storing a disk-shaped recording medium 12 such as an optical disk which is a compact disk, for example. At the center of the disc-shaped recording medium 12, a circular through hole 13 is provided as a chucking hole for inserting the drive shaft of the recording / reproducing apparatus at the time of recording / reproducing information and fixing the disc-shaped recording medium 12. ing.

[0003] The disk storage case 11 has a pair of covers 14 and 15 and a tray 16. The tray 16 is attached while being housed in the cover 15,
The cover 14 is also rotatably attached to one end of the cover 15 at fulcrums 17, 18 facing each other at one end. If the covers 14 and 15 are relatively rotated so that the cover 14 and the cover 15 come closer to each other, the tray 16 is covered with the cover 14 and becomes a covered state.

The tray 16 is provided with a concave portion 21 having a depth sufficient to fit the disc-shaped recording medium 12, and the concave portion 21 has an arc-shaped wall portion 22 rising around the concave portion. . The radius of the inner peripheral surface of the wall portion 22 is determined in consideration of the dimensional accuracy of the disk-shaped recording medium 12 and the diameter expansion due to thermal expansion. The value is selected to have a sufficient margin so as not to touch the surface.

[0005] At the center of the concave portion 21 is provided a disk holding portion 23 for holding the disk-shaped recording medium 12. The disk holding portion 23 is provided with a plurality of elastic pieces 25 which are independent from the pedestal portion 24. It is composed of Pedestal part 2
4 is higher than the bottom of the recess 21, and the elastic piece 25 is
After being raised on a circumference having a size substantially equal to 3, it is bent toward the center of the disk holding portion 23. The envelope circle formed by the upper portions of the plurality of elastic pieces 25 is slightly larger than the envelope circle formed by the base.

In order to accommodate the disk-shaped recording medium 12 in the disk accommodation case 11 as described above, first, the covers 14 and 15 are relatively rotated so that the covers 14 and 15 are separated from each other. Then, the disk storage case 11 is opened. Then, the user touches the outer peripheral surface of the disk-shaped recording medium 12 with his / her finger and holds the through-hole 13 with the plurality of elastic pieces 25.
And press the disk-shaped recording medium 12 in. As a result, the upper part of the elastic piece 25 is
, The envelope circle formed by the upper portions of the plurality of elastic pieces 25 becomes smaller, and the disk-shaped recording medium 12 reaches the pedestal portion 24.

When the through hole 13 passes over the plurality of elastic pieces 25, the elastic pieces 25 return to their original positions by their elastic force. For this reason, the elastic piece 25 abuts on the inner peripheral surface of the through hole 13 to engage with the through hole 13, and the envelope circle formed by the upper portions of the plurality of elastic pieces 25 is formed by the base as described above. Since the diameter of the disk-shaped recording medium 12 is slightly larger than the envelope circle, the disk-shaped recording medium 12 is held from the disk holding unit 23 without any play. Thereafter, the covers 14 and 15 are relatively rotated so that the covers 14 and 15 approach each other, and the disc housing case 11 is closed.

In this state, the disk-shaped recording medium 12 is placed on the pedestal 24, and the wall 22 and the disk holder 23 are higher than the surface of the disk-shaped recording medium 12. That is, the space in the thickness direction of the disk-shaped recording medium 12 is secured by the wall portion 22. Therefore, even if the covers 14 and 15 are deformed by an external force, the covers 14 and 15 do not come into contact with the front surface or the back surface (recording surface) of the disc-shaped recording medium 12, and the disc-shaped recording medium 12 is prevented from being damaged. ing.

Conversely, in order to take out the disk-shaped recording medium 12 from the disk housing case 11, the cover 1
The disc housing 11 is opened by rotating the covers 14 and 15 relatively so that the cover 4 and the cover 15 are separated from each other. Then, a finger of one hand is applied to the outer peripheral surface of the disk-shaped recording medium 12, and the tops of the plurality of elastic pieces 25 are pressed with the fingers of the other hand, and these elastic pieces 25 are moved toward the center Elastically deformed. When the disk-shaped recording medium 12 is lifted with one hand while the elastic piece 25 is elastically deformed, the disk-shaped recording medium 12 can be taken out from the tray 16.

Next, a description will be given of a disk storage case (for example, Japanese Patent No. 3051126) as a second conventional example of the present invention. In this disk storage case, a member corresponding to the tray 16 in the disk storage case 11 of the first conventional example shown in FIG. 9 is not provided, and two or four disk-shaped disks are provided in one disk storage case. A recording medium is accommodated. In a disk storage case that stores two disk-shaped recording media, a disk holding portion is provided on each inner surface of a pair of covers, and an arc-shaped wall portion is also provided on the inner surface of one cover. .

[0011] In the disk accommodating case accommodating four disk-shaped recording media, an intermediate plate is further provided between the pair of covers, and disk holding members are provided on the inner surface of each of the pair of covers and on both surfaces of the intermediate plate. And an arc-shaped wall portion is provided on both surfaces of the intermediate plate. Even in this second conventional disk storage case,
The radius of the inner peripheral surface of the wall portion is determined in consideration of the dimensional accuracy of the disk-shaped recording medium and the diameter expansion due to thermal expansion. Thus, the value is selected to have a sufficient margin.

In the first conventional example shown in FIG. 9, a tray 16 is provided even though only one disk-shaped recording medium 12 is stored in one disk storage case 11. For this reason, the thickness of the disk storage case 11 per one disk-shaped recording medium 12 is large, and a large space is required for storage, which is inconvenient for storage. Further, the number of parts per one disk-shaped recording medium 12 was large, and the manufacturing cost was high.

On the other hand, in the second conventional example described above, no tray is provided even though two or four disk-shaped recording media are stored in one disk storage case. Therefore, the thickness of the disk storage case per disk-shaped recording medium is small and the number of components is small.

[0014]

However, in the above-mentioned second conventional example, when the disk storage case is closed, the inner surfaces of the pair of covers or the inner surface of one cover and one surface of the intermediate plate face each other. I do. For this reason, when the disc housing case is closed, of the elastic pieces of the disc holding portion on the opposing surface, the portions projecting from the surface of the disc-shaped recording medium do not collide with each other, so that the operation of closing the disc housing case is not hindered. The elastic pieces of the disk holding portion on the opposing surface are provided alternately on the circumference. As a result, in the second conventional example, compared with the first conventional example, the number of the elastic pieces of the disk holding portion is half, and the distance at which the elastic pieces contact the inner peripheral surface of the through hole of the disk-shaped recording medium is also large. Half.

On the other hand, as described above, the radius of the inner peripheral surface of the wall is determined in consideration of the dimensional accuracy of the disk-shaped recording medium and the diameter expansion due to thermal expansion. Is selected to have a sufficient margin so as not to contact the inner peripheral surface of the wall. Therefore, when an impact is applied to the disk in the disk storage case due to a drop or the like during transportation of the disk storage case or the like, all of the impact is applied from the disk to the disk holding unit. Moreover, in the second conventional example, since the number of disk-shaped recording media accommodated in one disk-accommodating case is large, the disk accommodating case accommodating the disk-shaped recording medium is heavy.

For this reason, in the second conventional example, the impact applied to one elastic piece of the disk holding portion is large, the elastic piece is easily broken, and it is difficult to say that the reliability of the disk storage case is high. In particular, in a so-called sub-carton configuration in which a large number of disk storage cases accommodating a disk-shaped recording medium are collectively packaged or in a so-called master carton configuration in which a large number of sub-cartons are collectively packaged, the disk is dropped from the disk due to a drop during transportation or the like. The impact applied to the holding portion was even larger, and the elastic piece was more easily broken. Therefore,
SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable disk housing case in which a disk holding portion is unlikely to be damaged and a method of manufacturing the same.

[0017]

In the disk storage case according to the first aspect, an elastic member is provided in a region between the outer peripheral surface of the disk held by the disk holding portion and the inner peripheral surface of the wall portion. Have been. Therefore, even if a shock is applied to the disk in the disk storage case due to a drop or the like during transportation of the disk storage case or the like, the disk is brought into contact with the elastic member, and the shock is absorbed by the elastic member, and the disk is moved from the disk to the disk. The impact applied to the holding portion is reduced.

In the disk storage case according to the second aspect,
The elastic member has a foaming ratio of 1.3 to 5 (a density of 0.7 to 0.2 g).
/ Cm ³ ). For this reason, the elastic member has appropriate rigidity, so that the elastic member can be easily elastically deformed, and the impact applied to the disk is effectively absorbed by the elastic member.

In the disk storage case according to the third aspect,
Two elastic members, each having a length shorter than half the length of the outer peripheral surface of the disk, are arranged in pairs in the region between the outer peripheral surface of the disk and the inner peripheral surface of the wall. For this reason, the elastic member is easier to handle than one long elastic member whose length is close to the length of the outer peripheral surface of the disk, and the elastic member has an outer peripheral surface of the disk due to its elastic repulsion. And easily stick to the inner peripheral surface of the wall.

In the method for manufacturing a disk storage case according to the fourth aspect, since the elastic member is formed by punching out the thermoplastic synthetic resin sheet, the elastic member can be easily obtained.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to third embodiments of the present invention will be described with reference to FIGS. 1 to 7
However, the first embodiment can accommodate up to four disk-shaped recording media 12. The disk storage case 31 of the first embodiment includes a pair of covers 32, 33.
And intermediate plates 34, and covers 32, 33
Are rotatably attached to one end of the intermediate plate 34 on both sides of the intermediate plate 34. When the covers 32, 33 and the intermediate plate 34 are relatively rotated so that the covers 32, 33 and the intermediate plate 34 approach each other, both surfaces of the intermediate plate 34 are covered with the covers 32, 33. It will be in a state with a lid.

As shown particularly in FIG. 3, the center of each of the two surfaces of the intermediate plate 34 is
A disk holding portion 35 for holding the disk 2 is provided. The disk holding portion 35 includes a pedestal portion 36 and a plurality of elastic pieces 37 independent of each other. Base 36
Is higher than the plane of the intermediate plate 34, and the elastic piece 37 is bent toward the center of the disk holding portion 35 after standing on a circumference having substantially the same size as the through hole 13 of the disk-shaped recording medium 12. The envelope circle formed by the upper portions of the plurality of elastic pieces 37 is slightly larger than the envelope circle formed by the base.

On both surfaces of the intermediate plate 34, wall portions 3 extending in an arc shape around the disk holding portion 35 and having a height sufficient to fit two disk-shaped recording media 12.
8 is also provided. The radius Cr of the inner peripheral surface of the wall portion 38 is
Considering the dimensional accuracy of the disk-shaped recording medium 12 and the diameter expansion due to thermal expansion, even if thermal expansion occurs, the disk-shaped recording medium 12
Is selected to have a sufficient margin so that the outer peripheral surface of the inner wall does not contact the inner peripheral surface of the wall portion 38.

A disk holding portion 41 for holding the disk-shaped recording medium 12 is also provided at the center of the inner surface of each of the covers 32 and 33, and the disk holding portion 41 is independent of the pedestal portion 42. A plurality of elastic pieces 43 are provided. The structure of the disk holding unit 41 is substantially the same as the structure of the disk holding unit 35. However, when the disk storage case 31 is closed, an operation of closing the disk storage case 31 due to collision of the portions of the elastic pieces 37 and 43 of the disk holding portions 35 and 41 projecting from the surface of the disk-shaped recording medium 12 collides. The elastic pieces 37 and 43 of the disk holding parts 35 and 41 are provided alternately on the circumference so as not to be disturbed.

As shown in FIG. 4 in particular, the disk housing case 31 also has a pair of band-like elastic members 44 made of polyethylene having an expansion ratio of 2 for one wall portion 38. The height h of the elastic member 44 is slightly lower than the height of the wall portion 38 of the intermediate plate 34, and the length 1 is shorter than half the length of the outer peripheral surface of the disk-shaped recording medium 12. Also,
As shown in FIG. 3, assuming that the radius of the disk-shaped recording medium 12 is Dr, the thickness t of the elastic member 44 is in the range of t = (Cr−Dr) × 0.6 to 0.9.

When the elastic member 44 is bent as shown in FIG. 5, the disk-shaped recording medium 12 held in the disk holder 35 as shown in FIGS. Is arranged in a region 45 between the outer peripheral surface of the inner wall surface and the inner peripheral surface of the wall portion 38. The operation of housing the disk-shaped recording medium 12 in the disk housing case 31 and taking out the disk-shaped recording medium 12 from the disk housing case 31 is performed as shown in FIG.
This is the same as the case of the first conventional example shown in FIG. The operation of arranging the elastic member 44 in the region 45 may be performed after or before the disk-shaped recording medium 12 is stored in the disk storage case 31.

Even in the disk storage case 31 as described above,
As in the second conventional example, the number of elastic pieces 37, 43 of the disk holding portions 35, 41 is half that of the first conventional example, and the disk-shaped recording housed in one disk housing case 31. Since the maximum number of the media 12 is four, the disk storage case 31 in which the disk-shaped recording medium 12 is stored is heavy. However, in the disk storage case 31, the elastic member 44 is disposed in the region 45.

Therefore, even if the disk-shaped recording medium 12 in the disk-containing case 31 is subjected to an impact due to dropping during transportation or the like of the disk-containing case 31, the disk-shaped recording medium 12 abuts on the elastic member 44. This impact is absorbed by the elastic member 44, and the elastic pieces 3 of the disk holders 35 and 41 are removed from the disk-shaped recording medium 12.
The impact applied to 7, 43 is reduced.

Therefore, even if a drop or the like occurs during transportation in the sub-carton or master carton form, the elastic pieces 37 and 43 are hardly damaged, and the disc storage case 31 is not damaged.
High reliability. The elastic member 44 is provided together with the disk-shaped recording medium 12 at the time of shipment from the manufacturer.
, The disk-shaped recording medium 1 in this state
The consumer who has purchased the disc holder 2 and the disc housing case 31 can discard the elastic member 44 after opening the product or can continue to use the elastic member 44.

The elastic member 44 is made of polyethylene having an expansion ratio of 2, but the expansion ratio is not limited to 2, and a material having an expansion ratio of 1.3 to 5 (density 0.7 to 0.2 g / cm ³ ) is used. Can be used. However, when the expansion ratio is less than 1.3, the rigidity of the elastic member 44 becomes too high. In particular, when the elastic member 44 is inserted into the area 45 after the disk-shaped recording medium 12 is stored in the disk storage case 31, Workability decreases. When the disk-shaped recording medium 12 expands in diameter due to thermal expansion, the outer peripheral surface of the disk-shaped recording medium 12 may strongly contact the highly rigid elastic member 44, and the disk-shaped recording medium 12 may be deformed.

On the other hand, the expansion ratio of the material of the elastic member 44 is 5
Is exceeded, a shock is applied to the disk-shaped recording medium 12 in the disk storage case 31 and the disk-shaped recording medium 1
When 2 comes into contact with the elastic member 44, the compressive deformation of the elastic member 44 becomes too large. If the compression deformation of the elastic member 44 is too large, the disk-shaped recording medium 12 is
, The impact applied to the elastic pieces 37, 43 of the disk holding portions 35, 44 from the disk-shaped recording medium 12 is not easily reduced, and the elastic pieces 37, 43 may be damaged.

The material of the elastic member 44 is not limited to polyethylene, but may be a foamed material of a thermoplastic synthetic resin such as polypropylene, polystyrene, or polyurethane, or a rubber material such as styrene-butadiene rubber. However, wear due to contact friction with the outer peripheral surface of the disk-shaped recording medium 12 stored in the disk storage case 31, cost,
Considering availability and the like, a polyolefin-based material such as polyethylene or polypropylene is optimal.

The disk storage case 31 has one wall 3
8 is provided with a pair of band-shaped elastic members 44 whose length 1 is shorter than half the length of the outer peripheral surface of the disk-shaped recording medium 12. For this reason, the elastic member 44 is easier to handle than a single long elastic member whose length is close to the length of the outer peripheral surface of the disk-shaped recording medium 12, and the elastic member 4 is provided in the region 45.
The work of arranging 4 is easy. In addition, the elastic member 44 easily contacts the outer peripheral surface of the disk-shaped recording medium 12 due to its elastic repulsion, and is less likely to stick to the inner peripheral surface of the wall portion 38, so that the impact applied to the disk-shaped recording medium 12 is reduced. 44
There is little reduction in the effect absorbed by

Next, an embodiment of a method of manufacturing the elastic member 44 will be described. In this embodiment, a punching die 51 shown in FIG. 6 is prepared. In the punching die 51, a plurality of punching blades 53 are attached to a base material 52 made of plywood or the like. The length 1 of the cutting blade 53 is equal to the length 1 of the elastic member 44, and the interval w between the cutting blades 53 is equal to the height h of the elastic member 44. An elastic member 54 is provided between the punching blades 53 to prevent the punched elastic member 44 from biting between the punching blades 53 and not coming off.

Next, as shown in FIG.
A hard synthetic resin plate 56 such as an acrylic plate is placed on top,
Thermoplastic synthetic resin sheet 5 of thickness t made of the above-mentioned material
7 is placed on a synthetic resin plate 56. After that, the punching die 51 is pressed against the thermoplastic synthetic resin sheet 57 from above by a press device 58 or the like, and the thermoplastic synthetic resin sheet 57 is pressed.
Is punched out of the elastic member 44 having the above dimensions. However, only by punching, the elastic member 44 is linear as shown in FIG. 4, and both sides of the elastic member 44 are gripped and handled with the thumb and the forefinger. As a result, as shown in FIG. 5, an arc-shaped elastic member 44 is obtained, and the workability of disposing the elastic member 44 in the region 45 is improved.

FIG. 8 shows a second embodiment capable of accommodating up to two disk-shaped recording media 12. The disk storage case 61 of the second embodiment has a pair of covers 62 and 63 and no intermediate plate. The cover 62 is rotatably attached to one end of the cover 63. When these covers 62, 63 are relatively rotated so that the covers 62, 63 approach each other, the inner surfaces of the covers 62, 63 are covered with the covers 63, 62 and become covered.

The inner surface of the cover 63 is provided with a disk holder 64 and a wall 65 similar to the disk holder 35 and the wall 38 of the disk storage case 31 of the first embodiment, respectively. Also, a disk holding unit 66 similar to the disk holding unit 41 is provided. Also in the disk storage case 61 of the second embodiment, the elastic member 44 is provided in the region 67 between the outer peripheral surface of the disk-shaped recording medium 12 held by the disk holder 64 and the inner peripheral surface of the wall 65. Since a similar pair of elastic members (not shown) are provided, the same operation and effect as those of the disk storage case 31 of the first embodiment can be obtained. In addition, the wall 65 is the cover 6
2 may be provided on the inner surface.

Next, a third embodiment will be described. The third embodiment is different from the disk housing case 1 shown in FIG.
A pair of elastic members (not shown) similar to the elastic members 44 are provided in a region between the outer peripheral surface of the disk-shaped recording medium 12 and the inner peripheral surface of the wall portion 22 held by the first disk holder 23. , Except that the disk storage case 11 of the first conventional example shown in FIG. 9 is substantially the same. Also in the third embodiment, the elastic piece 25 of the disc holding unit 23 is moved from the disc-shaped recording medium 12.
Since the impact applied to the elastic piece 25 is reduced, the possibility of the elastic piece 25 being damaged is further reduced.

Although the disk-shaped recording medium 12 is also stored in the disk storage cases 31 and 61 of any of the first to third embodiments, a disk having a through hole at the center is used. If it is, a disk other than the recording medium can be stored in the disk storage cases 31, 61.

[0040]

In the disk storage case according to the first aspect, even if a shock is applied to the disk in the disk storage case due to a drop or the like during transportation of the disk storage case, the disk abuts on the elastic member. The impact is absorbed by the elastic member, and the impact applied from the disk to the disk holding portion is reduced. For this reason, the disk holding portion is not easily damaged, and the reliability of the disk storage case is high.

In the disk storage case according to the second aspect,
Since the elastic member can be easily elastically deformed, it is easy to arrange the elastic member in a region between the outer peripheral surface of the disk and the inner peripheral surface of the wall. Further, since the impact applied to the disk is effectively absorbed by the elastic member, the stored disk is hardly damaged, and the stored disk is effectively protected. Further, since the impact applied to the disk is effectively absorbed by the elastic member, the disk holding portion is hardly damaged, and the reliability of the disk storage case is further improved.

In the disk storage case according to the third aspect,
Since the handling of the elastic member is easy, the work of arranging the elastic member in the region between the outer peripheral surface of the disk and the inner peripheral surface of the wall is easy. Further, since the elastic member easily comes into contact with the outer peripheral surface of the disk due to its elastic repulsion and does not easily stick to the inner peripheral surface of the wall portion, the impact applied to the disk is more effectively absorbed by the elastic member, and the disk is more effectively absorbed. The holding portion is harder to be damaged, and the reliability of the disk storage case is further improved.

According to the method of manufacturing the disk storage case according to the fourth aspect, the elastic member can be easily obtained, so that the disk storage case can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a side sectional view of the first embodiment of the present invention.

FIG. 3 is a perspective view of the first embodiment of the present invention.

FIG. 4 is a perspective view of a linear state of an elastic member used in the first embodiment of the present invention.

FIG. 5 is a perspective view of an elastic member used in the first embodiment of the present invention in an arc state;

FIG. 6 is a perspective view of a cutting die for manufacturing an elastic member used in the first embodiment of the present invention.

FIG. 7 is a side view of an apparatus for manufacturing an elastic member used in the first embodiment of the present invention.

FIG. 8 is a perspective view of a second embodiment of the present invention.

FIG. 9 is an exploded perspective view of the first conventional example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 12 ... Disc-shaped recording medium (disk), 13 ... Through hole, 31 ... Disc storage case, 35 ... Disk holding part, 38 ... Wall part, 41 ... Disk holding part, 44 ... Elastic member, 45 ... Region, 57 ... Heat Plastic synthetic resin sheet, 61
... Disk storage case, 64 ... Disk holder, 65 ...
Wall part, 66: disk holding part, 67: area

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazutoshi Tsujino 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 3E036 AA07 AA09 CA04 3E068 AA08 AB01 AC06 CC01 DD14 DE12 EE01

Claims (4)

[Claims] 1. A disc holding portion that engages with a through hole provided in a center portion of a disc to hold the disc, and extends around the disc holding portion and has a radius of an inner peripheral surface that is equal to the radius of the disc. A wall portion larger than the radius of the outer peripheral surface of the disk, and an elastic member disposed in a region between the outer peripheral surface of the disk held by the disk holding portion and the inner peripheral surface of the wall portion. A disk housing case comprising: 2. The disk storage case according to claim 1, wherein said elastic member is made of a material having an expansion ratio of 1.3 to 5 (a density of 0.7 to 0.2 g / cm ³ ). 3. The disk storage case according to claim 1, wherein two elastic members each having a length shorter than half the length of the outer peripheral surface of the disk are arranged in pairs in the area. . 4. A disk holding portion for holding the disk by engaging a through hole provided in a center portion of the disk, and a radius of an inner peripheral surface extending around the disk holding portion and having a radius of an inner peripheral surface. And an elastic member disposed in a region between the outer peripheral surface of the disk held by the disk holding portion and the inner peripheral surface of the wall portion, the wall being larger than the radius of the outer peripheral surface of the disk. A method of manufacturing a disk storage case, comprising: punching a thermoplastic synthetic resin sheet to form the elastic member.