JP2004139675A - Disk cartridge and disk protective sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dust or the like from intruding into a disk inserting/ejecting opening. <P>SOLUTION: The disk cartridge 1 is provided with a cartridge main body 3 having a disk housing part 2 to house a disk 200, a shutter 6 attached to the cartridge main body 3 to be moved, and designed to open/close an opening 4 or the like for drive shaft insertion, a disk inserting/ejecting opening 7 for opening the upper part of the disk housing part 2 to the upper surface 3a side of the cartridge main body 3, and a disk protective sheet 8 for closing the disk inserting/ejecting opening 7. The disk protective sheet 8 is provided with a sheet main body 11 superposed on the upper surface of the cartridge main body 3 to close the disk inserting/ejecting opening 7, and an adhesive layer 12 for bonding the sheet main body 11 to the upper surface of the cartridge main body 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, the upper portion of the disk storage portion of the cartridge body is opened to the upper surface side to provide an opening for a disk having a diameter substantially the same as the disk storage portion, and a disk is stored in the disk storage portion from the opening. The present invention relates to a disc cartridge to be loaded in a recording and / or reproducing apparatus, and a disc protection sheet for closing a disc entry / exit opening of the disc cartridge to prevent dust and the like from entering.
[0002]
[Prior art]
As a disk cartridge for storing a disk, for example, a disk cartridge for storing an optical disk, a magneto-optical disk, or the like is known. As shown in FIG. 14, the disc cartridge 100 includes a cartridge main body 102 provided with a disk storage unit (hereinafter, referred to as a disk storage unit) 101 for storing a disk 200 as an information recording medium, and a cartridge main body 102. And a shutter 105 which is movably mounted and opens and closes a drive shaft insertion opening 103 and a recording and / or reproduction opening 104 provided in the cartridge main body 102.
[0003]
The cartridge main body 102 is formed by abutting the upper half 106 and the lower half 107 and integrally connecting them by a screw 108 or welding. For this reason, the disk cartridge 100 and the disk 200 are inseparable from each other, and the disk 200 and the disk cartridge 100 are always sold as a pair, which increases the cost.
[0004]
Therefore, as shown in FIG. 15, one side end of the cartridge body 102 having an opening for inserting a drive shaft and an opening for recording and / or reproduction (not shown) is used to open and close the opening. A shutter 105 having a U-shaped cross section is provided movably along the one side end, and a disc insertion port 109 is formed on the other end side opposite to the one side end of the cartridge main body 102, A disk cartridge 300 provided with a lid member 110 for opening and closing the disk insertion opening 109 has been developed. (For example, refer to Patent Document 1).
[0005]
As shown in FIG. 16, a disk cartridge 400 has been developed in which a part 111 of the main surface of the upper half 106 of the cartridge main body 102 can be opened and closed by a hinge 112 so that the disk 200 can be replaced. ing. (For example, see Patent Document 2).
[0006]
[Patent Document 1]
JP-A-6-12814 (Claims, FIG. 1)
[0007]
[Patent Document 2]
JP-A-9-213043 (Claims, FIG. 1)
[0008]
[Problems to be solved by the invention]
Meanwhile, the disk 200 used in the conventional disk cartridges 300 and 400 has a magnetic hub 201 at the center as shown in FIG. 17, and a turntable 501 of a recording and / or reproducing apparatus (not shown). 18 is a so-called magnet chucking type disc which is chucked by a magnet 502. As shown in FIG. 18, the disc 200 does not have a magnetic hub 201 at the center portion thereof, and has only a center hole 202. However, there is a problem that the disk cartridge 600 of the so-called mechanical chucking type, which is sandwiched and chucked on the turntable 501 by the clamp member 503 provided in the recording and / or reproducing apparatus, cannot be used.
[0009]
This is because the conventional disk cartridges 300 and 400 have a state in which the upper part of the disk storage part (the center part of the upper part of the disk storage part of the disk cartridge 400) is closed, and the recording and / or reproduction is performed. This is because the clamp member 503 provided on the apparatus side cannot be introduced into the cartridge.
[0010]
In addition, the disk cartridge 400 of Patent Document 2 has a configuration in which the upper part of the disk storage part is so-called half-open, so that it is difficult to insert the disk into the disk storage part as compared with the case where the upper part of the disk storage part is fully opened. was there.
[0011]
Therefore, as shown in FIG. 19, the upper part of the disk storage part 101 is opened to the upper surface side to provide an opening 121 for a disk having the same diameter as the disk storage part 101, and the disk 200 is inserted and removed through the opening 121. However, if an opening 121 for a disk having a diameter substantially the same as that of the disk storage unit 101 is provided above the disk storage unit 101, the disk can be easily dropped from the disk storage unit 101. There is a drawback that dust and the like enter the disc storage unit 101 from the opening 121 for use and adhere to the information recording surface of the disc.
[0012]
An object of the present invention is to provide a disk cartridge having an opening 121 for a disk having a diameter substantially equal to that of the disk storage unit 101 provided above the disk storage unit 101. An object of the present invention is to provide a disk cartridge and a disk protection sheet that can prevent dust and the like from entering through the disk entrance / exit opening 121 while preventing the disk from entering the disk.
[0013]
[Means for Solving the Problems]
According to the first aspect of the present invention, a cartridge body having an upper portion of the disk storage portion opened to the upper surface side and an opening for a disk having the same diameter as the disk storage portion is provided, and the cartridge body is movably attached to the cartridge body. A disk cartridge comprising: a shutter that opens and closes an opening for inserting a drive shaft provided on the bottom surface of the disk storage unit; and a lid that closes an opening for disk insertion / removal of the cartridge body.
A sheet body that overlaps the lid on the upper surface of the cartridge body to close the opening for the disk, and an adhesive layer that bonds the sheet body to the upper surface of the cartridge body. It consists of a disk protection sheet with
The adhesive layer adheres the sheet main body to the upper surface of the cartridge main body to cover the disk opening and closing opening of the cartridge main body, thereby preventing the disk from dropping out of the disk opening and closing opening. Further, dust and the like are prevented from entering through the opening for the disk.
[0014]
According to a second aspect of the present invention, in the disk cartridge according to the first aspect,
An opening closing portion located on the opening for the disk entry and exit, and a cartridge main body overlapping the upper surface of the adhesive layer at the periphery of the opening closing portion in the sheet main body of the disk protection sheet. And by providing the adhesive layer in the cartridge body overlapping portion,
Only the overlapping portion of the cartridge body was affixed to the cartridge body portion with an adhesive layer so that the opening / closing portion was not affixed to the cartridge body portion, and a disc or the like was not affixed to the opening / closing portion.
[0015]
According to a third aspect of the present invention, in the disk cartridge according to the second aspect,
By forming the adhesive layer of the disk protective sheet with a pressure-sensitive adhesive having repeated adhesiveness,
The disk protection sheet can be used repeatedly.
[0016]
According to a fourth aspect of the present invention, in the disk cartridge of the third aspect,
On the outer side of the cartridge main body overlapping portion of the sheet main body portion of the disk protective sheet, by providing a peeling projection projecting outside of the cartridge main body portion in a state of being superimposed on the cartridge main body portion,
The sheet main body can be easily separated from the cartridge main body by pinching and pulling the peeling projection.
[0017]
According to a fifth aspect of the present invention, in the disk cartridge of the third aspect,
By performing an antistatic treatment on the sheet body of the disk protection sheet,
The generation of static electricity at the time of peeling off the sheet main body and the like is suppressed, and the suction and adsorption of dust and the like due to the static electricity are prevented.
[0018]
According to a sixth aspect of the present invention, in the disk cartridge of the second aspect,
By providing a printing unit composed of characters and / or graphics on the sheet body of the disk protection sheet,
The type, performance, etc., of the stored disk, or the pattern, etc., are displayed to improve the aesthetic effect of the disk cartridge.
[0019]
According to a seventh aspect of the present invention, there is provided a cartridge main body in which an upper portion of a disk storage portion is opened to an upper surface side and an opening for a disk having a diameter substantially the same as that of the disk storage portion is provided. And a shutter for opening and closing a drive shaft insertion opening provided on the bottom surface of the disk storage unit, and a disk protection sheet that closes the disk entry / exit opening of the disk cartridge provided with:
An opening closing portion positioned on the opening for loading and unloading the disc, and a cartridge main body overlapping portion which is located on a peripheral portion of the opening closing portion and overlaps the upper surface of the cartridge main body portion, and wherein the cartridge main body overlapping portion is provided. Since the adhesive layer was provided,
The adhesive layer adheres the sheet main body to the upper surface of the cartridge main body to cover the disk opening and closing opening of the cartridge main body, thereby preventing the disk from dropping out of the disk opening and closing opening. In addition, it is possible to prevent dust and the like from entering from the opening for the disk, so that the product value of the disk cartridge can be further improved.
[0020]
The invention according to claim 8 is the disk protection sheet according to claim 7,
Since a recording receiving layer was provided on the surface opposite to the surface on which the adhesive layer was provided,
Necessary items can be recorded in the recording receiving layer.
[0021]
According to a ninth aspect of the present invention, in the disk protection sheet of the eighth aspect,
Since a sheet body portion of a standard size such as an A-4 plate having a recording receiving layer on the surface is formed by punching out the sheet,
Printing can be performed by using a printer or the like at the stage of a sheet of a standard size such as an A-4 plate before die cutting.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view of a disk cartridge in which a disk protection sheet is peeled off from a cartridge main body, FIG. 2 is a perspective view of a disk cartridge in which a disk protection sheet is stuck to the cartridge main body, and FIG. It is the perspective view seen from the side.
[0023]
The disk cartridge 1 has a cartridge body 3 having a disk housing 2 for housing a disk 200, and a drive shaft insertion opening movably mounted on the cartridge body 3 and provided on the bottom surface of the disk housing 2. A shutter 6 for opening and closing the unit 4 and an opening 5 for recording and / or reproduction; and an opening for loading and unloading a disk for opening the upper part of the disk storage unit 2 to the upper surface 3a which is one main surface of the cartridge body 3. And a disk protection sheet 8 as a lid for closing the opening 7 for loading and unloading the disk.
[0024]
As shown in the exploded perspective view of FIG. 4, the cartridge main body 3 is made of a thermoplastic material such as plastic such as polycarbonate (PC), acrylic butylene styrene (ABS), polystyrene (PS), and high impact polystyrene (GP-PS). The upper half 21 and the lower half 22 injection-molded with resin are connected by screws 23 or the like.
[0025]
The upper half 21 has a substantially circular peripheral wall 24 constituting the disk storage unit 2 and an opening 7 for loading and unloading a disk opening above the disk storage unit 2 to the upper surface 3 a side of the cartridge body 3. And an arc-shaped convex portion 9 provided on one side for preventing the disk from falling off. In addition, the lower half 22 has a plurality of substantially arc-shaped peripheral walls 25 and an opening 4 for inserting a drive shaft, which constitute the disk storage unit 2 in cooperation with the peripheral wall 24 on the upper half 21 side, and a recording and / or reproducing operation. And an erroneous erasure prevention member 26 is movably mounted. Further, a shutter moving concave portion 27 for setting a moving range (moving area) of the shutter 6 is provided on an outer surface (lower surface in FIG. 4) of the lower half 22, and the shutter 6 is overlapped on the shutter moving concave portion 27. Have been.
[0026]
The shutter 6 is formed by punching a thin plate of about 0.1 to 0.5 mm in thickness from stainless steel, aluminum, or the like into a rectangular shape, and has a slider mounting portion 6a bent at one end in the longitudinal direction. A slider 31 is attached by a screw 30. The slider 31 is slidably attached to one side of the cartridge main body 3 in a state of being sandwiched between the upper half 21 and the lower half 22. The shutter 6 is moved between a position where the opening 5 for reproduction is closed and a position where the opening 5 is opened.
[0027]
The shutter 6 is normally set at a position to close the drive shaft insertion opening 4 and the recording and / or reproducing opening 5 by the spring force of the shutter spring 32 acting on the slider 31. The free end side 6b of the shutter 6 (the side opposite to the slider mounting portion 6a) is guided by the shutter guide plate 33 to slide and is prevented from rolling up from the shutter moving recess 27 of the lower half 22. I have.
[0028]
As shown in the cross-sectional view of FIG. 5, the disk protection sheet 8 is overlapped on the upper surface of the cartridge main body 3 to close the disk access opening 7, and the disk protection sheet 8 An adhesive layer 12 that adheres to the upper surface of the cartridge body 3.
[0029]
The sheet body 11 of the disk protection sheet 8 is made of a synthetic resin such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), or a fiber such as nylon, rayon, or polyethylene terephthalate. Or a fixed sheet using a binder or the like, a sheet formed by foaming a synthetic resin such as polystyrene, or a so-called laminated sheet obtained by laminating the sheets, for example, about 10 μm to 0.5 mm (preferably 25 μm). ０．３0.3 mm).
[0030]
The sheet main body 11 has an opening closing portion 13 located on the disk opening / closing opening 7, and a disk opening / closing portion 13 located on a peripheral edge of the opening closing portion 13 on the upper surface 3 a of the cartridge main body 3. And a cartridge main body overlapping portion 14 overlapping the outside of the opening 7 of the cartridge. The adhesive layer 12 is provided on the back surface of the cartridge main body overlapping portion 14. The adhesive layer 12 is formed of a known pressure-sensitive adhesive having a repetitive adhesive property.
[0031]
Next, the operation of the disc cartridge 1 will be described.
[0032]
In the disk cartridge 1, the disk 200 is stored in the disk storage section 2 of the cartridge main body 3, and a disk protection sheet 8 is stuck on the upper surface of the cartridge main body 3, and the disk 200 is inserted into the disk storage section 2 through the disk opening 7. It is offered for sale etc. in a state where dust and the like do not enter.
[0033]
When the disc cartridge 1 is inserted into the recording and / or reproducing apparatus, the shutter 6 is moved by the shutter opening member provided in the apparatus, and the opening 4 for inserting the drive shaft and the opening for recording and / or reproducing are opened. 5 is released.
[0034]
When the disk 200 stored in the disk storage section 2 of the cartridge main body 3 has a magnetic hub 201 at the center, the disk 200 is loaded into a magnetic chucking type recording and / or reproducing apparatus. Then, a turntable is introduced into the disc cartridge 1 through the drive shaft insertion opening 4, and the magnetic hub 201 of the disc 200 is magnet-chucked to the turntable.
[0035]
When the disk 200 stored in the disk storage portion 2 of the cartridge body 3 does not have the magnetic hub 201 at the center, the disk protection sheet 8 is peeled off to open the disk opening and closing portion 7. When the disc is loaded into a mechanical chucking type recording and / or reproducing apparatus in a state where the disc is opened, the turntable 501 is introduced into the disc cartridge 1 through the opening 4 for inserting the drive shaft, and The disk is placed on the disk cartridge 1 and a clamp member 503 provided in the recording and / or reproducing apparatus is introduced into the disk cartridge 1 through the disk insertion / removal opening 7 of the disk cartridge 1. It is pressed on the turntable 501 and mechanically chucked. .
[0036]
FIG. 6 shows another embodiment of the disk protection sheet 8. This embodiment shows a case where the sheet main body 11 is subjected to an antistatic treatment.
[0037]
The antistatic treatment is performed by providing an antistatic layer 15 on the surface of the sheet body 11.
[0038]
The antistatic layer 15 is prepared by diluting a commercially available anionic, cationic or nonionic surfactant or an antistatic agent made of a polar polymer material with a solvent such as isopropyl alcohol and using a roll coater or the like. To form a sheet main body 11, which is formed by applying a conductive fine powder such as tin oxide, antimony or the like to a resin solution of a polyester resin by several weight%. At this time, carbon or the like may be mixed into the resin material to give the sheet body 11 itself an antistatic function. Note that the antistatic layer 15 may be provided on a portion of the back surface of the sheet body 11 other than the portion where the adhesive layer 12 is provided.
[0039]
7 and 8 show another embodiment of the disk protection sheet 8. FIG. In this embodiment, the sheet main body 11 includes a printing unit 41 formed of characters, graphics, and the like on the front surface and / or the back surface.
[0040]
The printing unit 41 displays the method of use of the disk protection sheet 8 and the performance, type, manufacturer name, trademark, and the like of the disk so that the disk cartridge 1 can be more easily used and has a design effect and It has an aesthetic effect. The other configuration is the same as that of the basic disk protection sheet 8 described above, and the duplicate description will be omitted.
[0041]
FIG. 9 shows another embodiment of the disk protection sheet 8. In this embodiment, the sheet body 11 is provided with a record receiving layer 51 on its surface (the surface opposite to the surface on which the adhesive layer 12 is provided) so that the user can freely write characters and the like. .
[0042]
The recording receiving layer 51 is formed by kneading a known ultraviolet curable resin with a hydrophilic material such as protein powder or wood-based cellulose, and fine powder such as calcium carbonate or clay for surface control as appropriate. 3 is applied to the surface.
[0043]
The recording receiving layer 51 has a hydrophilic property so that a user can write personal information such as recorded contents using a water-based pen or the like, or use a printer such as an ink-jet printer to write characters or images. Etc. can be recorded.
[0044]
In order to facilitate printing using a commercially available printer, as shown in FIG. 10, the disk protection sheet 8 is die-cut from a sheet body 11 made to a standard size such as a substantially A-4 plate. ing.
[0045]
As shown in FIG. 11, a release paper 52 is detachably attached to the back side of the sheet main body 11 via an adhesive layer 12, and a recording receiving layer 51 is provided on the front side.
[0046]
A punching portion (half cut portion) 53 having a disk protection sheet shape is provided from the recording receiving layer 51 to the sheet body 11 and the adhesive layer 12. After the recording receiving layer 51 is printed by a printer, a part of the sheet body 11 is separated by the punching section 53 to form the disk protection sheet 8. The other configuration is the same as that of the basic disk protection sheet 8 described above, and the duplicate description will be omitted.
[0047]
12 and 13 show another embodiment of the disk protection sheet 8. In this embodiment, the disk protection sheet 8 is provided with a peeling projection 61 projecting from the outer periphery of the cartridge body 3 to which the disk protection sheet 8 is attached.
[0048]
The peeling protrusion 61 does not have the adhesive layer 12, and when the disk protection sheet 8 is adhered to the cartridge body 3, the peeling protrusion 61 becomes the outer periphery of the cartridge body 3. It protrudes from the part.
[0049]
Then, the disk protection sheet 8 can be easily peeled from the cartridge body 3 by pulling the peeling projection 61. The other configuration is the same as that of the basic disk protection sheet 8 described above, and the duplicate description will be omitted.
[0050]
【The invention's effect】
The disk cartridge and the disk protection sheet of the present invention have the following effects.
(1) In the disk cartridge according to the first aspect, a disk protection sheet as a lid is adhered to an upper surface of the cartridge main body with an adhesive layer to close an opening for the disk insertion / removal of the cartridge main body. In addition to preventing the disk from dropping out of the disk opening, dust and the like can be prevented from entering through the disk entrance opening.
(2) In the disc cartridge according to the second aspect, only the cartridge main body overlapping portion of the disc protection sheet is adhered to the cartridge main body portion with an adhesive layer, and the opening closing portion is not adhered to the cartridge main body portion. There is no sticking. (3) In the disk cartridge of the third aspect, since the adhesive layer is formed of a pressure-sensitive adhesive having repeated adhesiveness, the disk protective sheet can be used repeatedly.
(4) In the disk cartridge according to the fourth aspect of the present invention, since the disc protection sheet is provided with a peeling projection projecting from the outer peripheral portion of the cartridge body, the peeling projection is pulled to pull the disc protection sheet from the cartridge body. Can be easily peeled off.
(5) The disk cartridge according to the fifth aspect suppresses the generation of static electricity when the disc protective sheet is peeled off, and prevents the suction and adsorption of dust and the like due to the static electricity.
(6) The disc cartridge according to the sixth aspect displays, by the printing unit, the method of using the disc protection sheet, the performance, type, maker name, trademark, etc. of the disc to make the disc cartridge more usable and aesthetically pleasing to the disc cartridge. An effect can be provided.
(7) The disk protective sheet according to claim 7 is adhered to the upper surface of the cartridge main body of the disk cartridge to close the disk opening and closing opening of the disk cartridge, and the disk falls from the disk opening and closing opening. In addition, dust and the like can be prevented from entering through the disk entry / exit opening, and the product value of the disk cartridge can be increased.
(8) In the disk protective sheet according to the eighth aspect, since the recording receiving layer is provided, necessary items can be recorded on the recording receiving layer.
(9) The disk protective sheet according to the ninth aspect is formed in a standard size such as an A-4 plate, and is formed by stamping out a sheet body portion provided with a recording receiving layer on the surface. Previously, it was made to a standard size such as A-4 size, so that printing using a printer or the like can be easily performed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a disk cartridge in a state where a disk protection sheet is peeled off.
FIG. 2 is a perspective view of the disc cartridge with a disc protection sheet attached thereto.
FIG. 3 is a perspective view of the disk cartridge as viewed from the back side.
FIG. 4 is an exploded perspective view of the disk cartridge.
FIG. 5 is a sectional view taken along line AA of FIG. 1;
FIG. 6 is a cross-sectional view of another embodiment of the disk protection sheet.
FIG. 7 is a plan view of another embodiment of the disk protection sheet.
FIG. 8 is a sectional view taken along line BB of FIG. 7;
FIG. 9 is a sectional view of another embodiment of the disk protection sheet.
FIG. 10 is a plan view showing an example of a method for manufacturing a disk protection sheet.
FIG. 11 is a sectional view taken along line CC of FIG. 10;
FIG. 12 is a plan view of another embodiment of the disk protection sheet.
FIG. 13 is a sectional view taken along the line DD in FIG. 12;
FIG. 14 is a perspective view of a conventional example.
FIG. 15 is a perspective view of another conventional example.
FIG. 16 is a perspective view of another conventional example.
FIG. 17 is a sectional view of a state where the disk is magnet-chucked.
FIG. 18 is a sectional view showing a state where the disk is mechanically chucked.
FIG. 19 is a perspective view of another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Disc cartridge, 2 ... Disc storage part, 3 ... Cartridge main body part, 4 ... Opening for inserting a drive shaft, 5 ... Opening for recording and / or reproduction, 6 ... Shutter, 7 ... Opening and closing of a disc Reference numeral 8: Disk protection sheet (lid), 11: Sheet main body, 12: Adhesive layer, 13: Opening closing part, 14: Cartridge main body overlapping part, 15: Antistatic layer, 41: Printing part, 51 ... Recording receiving layer, 61: peeling projection, 200: disk, 201: magnetic hub.

Claims (9)

The upper part of the disk storage part is opened to the top side, and the cartridge body part provided with an opening for the disk to enter and exit with the same diameter as the disk storage part, and the bottom of the disk storage part movably mounted on the cartridge body part A shutter that opens and closes an opening for driving shaft insertion provided in the cartridge body, and a lid that closes an opening for disk entry and exit of the cartridge body,
The lid includes a sheet body that is overlapped on an upper surface of the cartridge body to close the opening for the disk, and an adhesive layer that bonds the sheet body to the upper surface of the cartridge body. A disk cartridge comprising a disk protection sheet provided with the disk cartridge. The sheet main body of the disc protection sheet has an opening closing portion located on the opening for opening and closing the disc, and a cartridge main body overlapping portion located on a peripheral portion of the opening closing portion and overlapping the upper surface of the cartridge main body. ,
2. The disk cartridge according to claim 1, wherein the adhesive layer is provided on the cartridge body overlapping portion. 2. The disk cartridge according to claim 1, wherein the adhesive layer of the disk protection sheet is formed of a pressure-sensitive adhesive having repeated adhesiveness. The sheet main body of the disc protection sheet is provided with a peeling projection projecting outside of the cartridge main body in a state of being superposed on the cartridge main body outside the cartridge main body overlapping section. The disk cartridge according to claim 3, wherein The disk cartridge according to claim 1, wherein an antistatic treatment is applied to a sheet main body of the disk protection sheet. 2. The disk cartridge according to claim 1, wherein a printing section made of characters and / or graphics is provided on a sheet body of the disk protection sheet. The upper part of the disk storage part is opened to the top side, and the cartridge body part provided with an opening for the disk to enter and exit with the same diameter as the disk storage part, and the bottom of the disk storage part movably mounted on the cartridge body part And a shutter that opens and closes an opening for inserting a drive shaft provided in the disk protection sheet that closes the opening for entering and exiting the disk of the disk cartridge.
An opening closing portion located on the opening for loading and unloading the disc, and a cartridge main body overlapping portion which is located on a peripheral portion of the opening closing portion and overlaps the upper surface of the cartridge main portion,
The disc protection sheet according to claim 1, wherein the cartridge main body overlapping portion is provided with an adhesive layer that adheres to the cartridge main body portion. 2. The disk protection sheet according to claim 1, wherein a recording receiving layer is provided on a surface opposite to a surface on which the adhesive layer is provided. 8. The disk protective sheet according to claim 7, wherein the disk protective sheet is provided with a recording receiving layer on the surface and formed by stamping out a sheet made to a standard size.

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