JPH0883477A - Disk cartridge - Google Patents

Abstract

PURPOSE: To surely remove dust, etc., stuck on the surface of an information recording medium by making the cleaning air efficiently flow in a main body of a disk cartridge. CONSTITUTION: A disk housing part 8, wherein the information recording medium 2 is freely rotatably housed, with upper and lower halves 4, 5 made from a synthetic resin, is formed in the main body 3 of the cartridge. Spaces 28 constituting the air flow passage are provided on an annular rib 27 which is provided at the, center part of an inner wall of either one of the halves 4, 5 to control the free movement of a hub 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge in which a disc-shaped information recording medium such as a floppy disc or an optical disc is rotatably housed in a cartridge body constituted by a pair of upper and lower halves butted against each other and coupled together. Regarding

[0002]

2. Description of the Related Art In a disk cartridge in which a disk-shaped information recording medium such as a floppy disk or an optical disk is rotatably accommodated, when a dust or the like adheres to the surface of the information recording medium, it is possible to read or accurately record the recorded information signal. There arises a problem that it becomes impossible to record a proper information signal. That is, dust or the like attached to the surface of the information recording medium may cause a so-called dropout when the disc cartridge is loaded into the recording / reproducing device and the information recording medium is rotated, and is caught between the information recording medium and the magnetic head. There is a problem of becoming. In order to solve this problem, the disk cartridge is generally housed in a flat and compact case so that dust and the like will not adhere to it.

Further, in the disc cartridge, liners are respectively inserted between the information recording medium and the inner wall of the upper half and the inner wall of the lower half, and the liner rubs against the surface of the rotating information recording medium to cause dust and the like. Is configured to be wiped.

However, in the process of manufacturing and assembling such a disk cartridge, the liner is vibrated by the applied ultrasonic waves when mechanical shock during assembly, especially when the upper and lower halves are adhered by ultrasonic welding. Fine constituent powder of the liner adheres to the surface of the information recording medium.

As described above, in the disc cartridge, the liner for wiping off the dust and the like adhering to the surface of the information recording medium during use causes the dust and the like during the assembling process.

As a method for solving this problem,
For example, there is an air cleaning method for an information recording medium disclosed in Japanese Patent Application Laid-Open No. 62-270087, "Magnetic Disk Cleaning Method and Apparatus". In this cleaning method, the disk cartridge is mounted on the cleaning device, the information recording medium housed in the cartridge body is rotated, and the signal area of the information recording medium is exposed to the outside of the cartridge body. A method of sucking air inside the cartridge main body through the rectangular information signal recording / reproducing opening and discharging the dust and the like adhering to the surface of the information recording medium to the outside of the cartridge main body by the suction of the air Is.

However, in the air cleaning method of the information recording medium in which air is sucked through the information signal recording / reproducing opening, the synthetic resin material for opening / closing the information signal recording / reproducing opening is formed in a U-shaped cross section. The shutter member must be held open for cleaning. Therefore, this air cleaning method requires a means for holding the shutter member of the disk cartridge in the open state, and thus has a problem that the cleaning device is complicated and troublesome. Further, such a method has a problem that the fine constituent powder and dust of the liner attached to the surface of the information recording medium are not sufficiently sucked and removed, and the cleaning effect is poor.

[0008]

As a method of solving this problem, air is blown from the outside of the cartridge main body through a circular disk-entry opening formed in the center of the lower half of the cartridge main body. Therefore, a method of blowing away dust or the like adhering to the surface of the information recording medium to remove it is considered.

By the way, in the disc cartridge, a coupling-shaped center hub for clamping, which is assembled in the center hole of the information recording medium, is regulated so that the information recording medium can be rotated in a stable state. Means are provided. The center hub restricting means is composed of an annular rib integrally provided upright on the inner wall on the upper half side corresponding to the disc entrance opening on the lower half side.

The annular rib is located on the inner peripheral portion of the center hub of the information recording medium in a state where the upper half and the lower half are connected to each other, and prevents the center hub from moving.

For this reason, the air blown from the disc entrance opening is blocked by the annular rib, does not reach the inside of the cartridge body sufficiently, and dust and the like adhering to the information recording medium cannot be removed sufficiently. There is such a problem.

Therefore, according to the present invention, the cleaning air blown from the disc entry opening is made to efficiently flow inside the cartridge body, and the fine liner fine constituent powder, dust and the like adhering to the surface of the information recording medium are removed. It is proposed for the purpose of providing a disc cartridge which is surely removed.

[0013]

A disk cartridge according to the present invention, which has achieved the object, is provided in the center portion of the inner wall of one of the upper half and the lower half of the cartridge body, and the information recording medium The annular rib for restricting the center hub assembled in the center hole is provided with a gap forming an air flow path.

Further, in the disk cartridge according to the present invention, annular ribs having a gap forming an air flow path are formed by a large number of arcuate standing walls integrally provided on the inner wall of the half located on the same circumference. It is characterized by that.

Further, in the disk cartridge according to the present invention, the annular rib having a gap forming the air flow path is formed by a large number of pin-shaped projections which are integrally provided on the inner wall of the half located on the same circumference. It is characterized by being done.

Furthermore, in the disk cartridge according to the present invention, the annular rib is formed such that the leading edge portion facing the inner wall of the other half is a concave-convex surface, and the upper half and the lower half are joined together to form the concave portion and the other half. Is characterized in that a gap forming an air flow path is formed between the inner wall of the half.

[0017]

According to the disk cartridge of the present invention configured as described above, the annular rib provided in the central portion of the inner wall of one of the halves is provided with the gap forming the air flow path. The cleaning air blown from the cleaning device through the disc entry opening reaches the inside of the cartridge body sufficiently through the gap between the annular ribs, flows out of the cartridge body, and adheres to the surface of the information recording medium. It is possible to remove the fine constituent powder and dust of the liner.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. A disk cartridge 1 shown as a first embodiment of the present invention with reference to FIGS.
A disk cartridge 1 rotatably accommodating a 3.5-inch diameter floppy disk 2, in which an upper half 4 and a lower half 5 each having a rectangular approximately shallow dish shape formed of a synthetic resin material are butted and joined to each other, As shown in FIG. 2, the cartridge body 3 having an overall thin box shape is configured.

On the outer peripheral portions of the upper half 4 and the lower half 5,
The rising peripheral walls 6 and 7 that are abutted against each other and constitute the outer peripheral wall of the cartridge body 3 are integrally erected, and the inner walls of the upper half 4 and the lower half 5 that face each other have the rising peripheral walls 6, 7. Disc storage portion forming walls 9 and 10 which are formed as a plurality of walls substantially inscribed in 7 and are abutted against each other to form a circular disc storage portion 8.
And a plurality of butt fitting protrusions 11 and 12 are provided upright.

The upper half 4 and the lower half 5 configured as described above are assembled so that the rising peripheral walls 6 and 7 and the disk storage portion forming walls 9 and 10 are butted against each other, and each butted fitting is performed. Fit the mating protrusions 11 and 12,
The butt-fitting projections 11 and 12 are integrated by ultrasonic welding or the like to form the cartridge body 3.

A circular opening 13 is formed in the lower half 5 so as to form a center hole of the disk storage portion 8. When the disc cartridge 1 is loaded into the recording / reproducing apparatus, the opening 13 acts as a disc entry opening into which the disc table of the recording / reproducing apparatus that drives the floppy disc 2 housed in the cartridge body 3 enters. 2 shows the center hub 14 which is attached through the attachment ring 15 so as to close the center hole 2A of the floppy disk 2 housed in the cartridge body 3. So that the lower half 5 faces outward.

The center hub 14 is formed in a generally coupling shape in which a flange portion is integrally provided on the outer peripheral portion of a fitting portion having a diameter substantially the same as the diameter of the center hole 2A of the floppy disk 2. In addition, the center hub 14
In the state where the disc cartridge 1 is loaded in the recording / reproducing device, a spindle shaft hole 31 into which a spindle shaft provided in the disc table on the recording / reproducing device side that enters from the disc entry opening 13 fits, and chucking. A chucking hole 32 into which the convex portion fits is provided.

Further, the upper half 4 and the lower half 5 have an information signal for exposing at least a part of the signal area of the floppy disk 2 housed in the disk housing portion 8 to the outside of the cartridge body 3 over the inner and outer circumferences. Recording / playback opening 1
6 and 17 are opened facing each other. As shown in FIG. 1, these information signal recording / reproducing openings 16 and 17 extend in the left-right direction of the upper half 4 and the lower half 5 from the position adjacent to the disc entry opening 13 to the front side of the cartridge body 3. It is located in the approximate center and is formed in a rectangular shape.

The cartridge main body 3 has a whole structure including integral shutter portions 19 and 20 which are formed of a synthetic resin material and face each other in parallel, and a connecting portion 21 which connects the base end sides of these shutter portions 19 and 20. A shutter member 18 having a U-shaped cross section is movably assembled. The shutter portions 19 and 20 have openings 22A and 22 of substantially the same type as the information signal recording / reproducing openings 16 and 17.
B is opened.

The shutter member 18 is provided with a shutter spring 23 disposed at one corner of the front side of the lower half 5 so that the openings 22A and 22B do not correspond to the information signal recording / reproducing openings 16 and 17. By being urged, the information signal recording / reproducing opening 1 when not in use
It acts to prevent dust and the like from entering the disk storage portion 8 from 6 and 17 and to adhere to the stored floppy disk 2, or to prevent the floppy disk 2 from being scratched. Further, when the disc cartridge 1 is loaded into the recording / reproducing apparatus, the shutter member 18 engages with the shutter driving member on the recording / reproducing apparatus side that moves along the front surface side of the cartridge body 3 to engage the shutter spring 23. Against the elastic force of the cartridge body 3
Is moved along with the openings 22A, 2
2B is located at a position corresponding to the information signal recording / reproducing openings 16 and 17 and is in a released state.

At one corner on the rear side of the lower half 5,
The erroneous recording prevention member 24 is movably assembled.
The erroneous recording prevention member 24 is moved to a first position where an erroneous recording detection hole (not shown) formed in the lower half 5 is opened and a second position where it is closed. When the erroneous recording prevention member 24 is set to the first position with the erroneous recording detection hole opened, when the disc cartridge 1 is loaded into the recording / reproducing apparatus, the erroneous recording detecting means of the recording / reproducing apparatus detects the erroneous recording. Recording the information signal on the floppy disk 2 is prohibited by detecting the hole. This prevents the information signal recorded on the floppy disk 2 from being accidentally erased. Further, when the erroneous recording prevention member 24 is set at the second position where the erroneous recording detection hole is closed, the erroneous recording detection hole is not detected by the erroneous recording detection means, so that information on the floppy disk 2 is not detected. Signal recording is allowed.

Inner wall of upper half 4 and floppy disk 2
Between the inner wall of the lower half 5 and the floppy disk 2, there are arranged an upper liner 25 and a lower liner 26 which are joined and fixed to the upper half 4 and the lower half 5, respectively. In addition, these upper liner 25 and lower liner 26
Are approximately the same diameter as the floppy disk 2, and the center hole 2A of the floppy disk 2 is located at the center.
The center holes 25A and 26A each having a diameter slightly larger than the hole diameter are formed in an annular shape. Also, the upper liner 2
5 and the lower liner 26, from the outer peripheral portion to the central hole 25A,
Notch 25 in a radial direction toward a position close to 26A
B and 26B are provided. These notches 25B, 2
6B is slightly larger than the opening size of the information signal recording / reproducing openings 16 and 17 provided in the upper half 4 and the lower half 5, respectively.

As shown in FIG. 1, an annular rib 27 is integrally provided on the upper half 4 at the center of the inner wall thereof so as to correspond to the disc entry opening 13 of the lower half 5. The annular rib 27 serves as the center hub 14 of the floppy disk 2.
It has an outer diameter dimension slightly smaller than the inner diameter dimension of. Further, the annular rib 27 has a height dimension slightly smaller than the height dimension of the rising peripheral walls 6 and 7 which are abutted against each other and constitute the outer peripheral wall of the disc cartridge 1. Therefore, in the state where the upper half 4 and the lower half 5 are combined, the annular rib 27 is provided inside the center hub 14 for the floppy disk 2 rotatably housed in the cartridge body 3 as shown in FIG. It extends along the peripheral wall. The floppy disk 2 has an annular rib 2
The inner peripheral portion of the center hub 14 is regulated over the entire circumference by 7 to prevent looseness in the diameter direction and the thickness direction, so that the cartridge hub 3 smoothly rotates.

The annular rib 27 is provided with a plurality of notches 28 for communicating the inside and the outside.

In other words, the annular rib 27 has a plurality of arcuate standing walls located on the same circumference and standing on the inner surface of the upper half 4, and the center hub 14 of the floppy disk 2 is located between these standing walls. A plurality of gaps 28 are formed to connect the inner space portion of the disk and the disk storage portion 8 with each other.

A lifter 29 formed by bending a synthetic resin sheet material into a substantially V-shape is assembled and fixed to the lower half 5. The lifter 29 pushes the lower liner 26 against the lower surface of the floppy disk 2 by contacting the lower end of the lower liner 26, the rising end of which is welded and fixed to the inner wall of the lower half 5, so as to contact the lower liner 26. Further, a center plate 30 formed of a synthetic resin material having abrasion resistance and located at the center is joined and fixed to the inner wall of the upper half 4. The center plate 30 regulates the abutting height of the spindle shaft of the disk table entering from the disk entrance opening 13 formed in the lower half 5 when the disk cartridge 1 is loaded in the recording / reproducing apparatus, and the floppy disk 2
The receiving portion of the upper surface of the center hub 14 assembled in the center hole 2A is configured to prevent the upper half 4 from being worn or damaged.

When the disk cartridge 1 is loaded in a recording / reproducing apparatus and a recording operation or a reproducing operation is performed and the floppy disk 2 rotates, the lifter 29 acts so that the upper liner 25 and the lower liner 26 have a light contact pressure. Rubbing the upper and lower surfaces of the floppy disk 2. The floppy disk 2 is torque-braked by the contact pressure between the upper liner 25 and the lower liner 26, and is smoothly rotated without causing uneven rotation.

The floppy disk 2 has a wiping effect of the upper liner 25 and the lower liner 26,
Dust and the like adhering to the surface is wiped off. The dust and the like wiped on the upper liner 25 and the lower liner 26 are taken in between the fibers forming the upper liner 25 and the lower liner 26, so that the floppy disk 2 is cleaned.

The disk cartridge 1 having the above-described structure has the upper half 4 and the lower half 5 as described above.
The corresponding butt-fitting projections 11 and 12 are fitted and ultrasonically welded to the butt-fitting projections 11 and 12 to integrally form the cartridge main body 3. This ultrasonic welding step A cleaning process is performed as a subsequent process. That is, this cleaning step is a step of removing fine constituent powder, dust, or the like of the upper liner 25 and the lower liner 26 generated in the ultrasonic welding step from the surface of the floppy disk 2, and a disc entry opening provided in the lower half 4. This is performed by applying an air nozzle to the portion 13 and blowing air into the cartridge body 3.

As described above, the disc entrance opening 1
An annular rib 27 provided on the side of the upper half 4 faces the disk 3, and the air blown into the cartridge body 3 through a gap 28 provided in the annular rib 27 into the disk storage portion 8. And efficiently inflow. The air that has flowed into the disc storage portion 8 is opened by the information signal recording / reproducing openings 16, 1
7 flows out of the cartridge body 3, but at that time, the upper liner 2 attached to the surface of the floppy disk 2
5 or the fine liner, dust or the like of the lower liner 26 is blown off from the surface of the floppy disk 2 to be removed, whereby cleaning is performed.

6 to 8 show a disk cartridge 40 according to a second embodiment of the present invention, in which hub restricting means for restricting the center hub 14 of the floppy disk 2 is positioned on the same circumference. It is characterized by the configuration formed by a large number of pin-shaped convex portions 43 provided. Since the basic structure of this disk cartridge 40 is substantially the same as that of the disk cartridge 1 of the first embodiment described above, the same members are designated by the same reference numerals and the description thereof is omitted.

That is, as shown in FIG. 6, the upper half 41 has a large number of pin-shaped projections 43 located on the same circumference, corresponding to the disk entry openings 13 of the lower half 42.
Are erected integrally. The circumference formed by these pin-shaped protrusions 43 has a diameter dimension slightly smaller than the inner diameter dimension of the center hub 14 of the floppy disk 2. In addition, each pin-shaped convex portion 43,
The height dimension is slightly smaller than the height dimension of the rising peripheral walls 6 and 7 of the upper half 41 and the lower half 42 which are butted against each other and constitute the outer peripheral wall of the disc cartridge 40.

Therefore, a large number of pin protrusions 43 standing on the upper half 41 positioned on the same circumference, in the state where the upper half 41 and the lower half 42 are joined,
As shown in FIG. 8, the floppy disk 2 rotatably housed in the cartridge body 3 extends along the inner peripheral wall of the center hub 14. In the floppy disk 2, the inner peripheral portion of the center hub 14 is regulated over the entire circumference by the pin-shaped convex portion 43 to prevent looseness in the diametrical direction and the thickness direction, so that the floppy disk 2 smoothly inside the cartridge main body 3. It rotates.

By the way, the embodiment disk cartridge 4
0 indicates that the regulating means for the center hub 14 of the floppy disk 2 is constituted by a large number of pin-shaped convex portions 43, so that the space between the pin-shaped convex portions 43 and the inner space of the center hub 14 of the floppy disk 2 and the disc. Storage part 8
A plurality of gaps 44 that communicate with and are formed.

The disc cartridge 40 having the above-described structure has the upper half 41 and the lower half 4 as described above.
The cartridge main body 3 is configured by integrating 2 with the corresponding butt-fitting projections 11 and 12 and applying ultrasonic welding to these butt-fitting projections 11 and 12 to integrate them. A cleaning process is performed as a process subsequent to the sonic welding process. That is, this cleaning step is a step of removing the fine constituent powder of the upper liner 25 and the lower liner 26 generated in the ultrasonic welding step from the surface of the floppy disk 2, and the disk entry opening 13 provided in the lower half 4.
This is performed by applying an air nozzle to and blowing air into the cartridge body 3.

In the disk entrance opening 13, a large number of pin-shaped protrusions 4 are provided upright on the same circumference on the side of the upper half 41.
3, the air blown into the cartridge main body 3 through the gap 44 formed between the pin-shaped convex portions 43 efficiently flows into the disc storage portion 8.
The air that has flowed into the disk storage portion 8 flows out of the cartridge main body 3 through the information signal recording / reproducing openings 16 and 17, and at that time, the upper liner 25 or the lower liner 26 attached to the surface of the floppy disk 2 is used. The fine constituent powder, dust, etc. are blown off from the surface of the floppy disk 2 to be removed, so that cleaning is performed.

FIGS. 9 to 11 show a disk cartridge 50 as a third embodiment of the present invention, in which an annular rib 53 for restricting the center hub 14 of the floppy disk 2 is formed with a tip edge portion having an uneven surface. It has a feature in the configuration. The disk cartridge 50 also
Since the basic structure is substantially the same as that of the disk cartridge 1 of the first embodiment, the same members are designated by the same reference numerals and the description thereof is omitted.

As shown in FIG. 9, an annular rib 53 is integrally provided upright on the upper half 51 at the center of the inner wall corresponding to the disc entry opening 13 of the lower half 52. The annular rib 53 has an outer diameter slightly smaller than the inner diameter of the center hub 14 of the floppy disk 2.

Further, as described above, the annular rib 53 is
Although the upper edge is formed as an uneven surface, the heights of the projections 54 are made to abut each other to be substantially equal to the heights of the rising peripheral walls 6 and 7 forming the outer peripheral wall of the disk cartridge 50. The height of the recess 55 is smaller than the height of the rising peripheral walls 6 and 7. Therefore, in the state where the upper half 51 and the lower half 52 are combined, the annular rib 53 is attached to the center hub 1 as shown in FIG. 11 with respect to the floppy disk 2 rotatably housed in the cartridge body 3.
4 extends along the inner peripheral wall. Floppy disk 2
With the annular rib 53, the inner peripheral portion of the center hub 14 is regulated over the entire circumference to prevent looseness in the diameter direction and the thickness direction, so that the cartridge hub 3 smoothly rotates.

Further, the annular rib 53, in the state where the upper half 51 and the lower half 52 are coupled, is located between the inner surface of the lower half 52 and the inner space of the center hub 14 of the floppy disk 2 in the recess 55. And a plurality of gaps for communicating the disk storage portion 8 with each other.

The disk cartridge 50 having the above-described structure has the upper half 51 and the lower half 5 as described above.
The corresponding butt-fitting projections 11 and 12 are fitted to each other and the butt-fitting projections 11 and 12 are ultrasonically welded together to form the cartridge body 3. A cleaning process is performed as a process subsequent to the ultrasonic welding process. That is, this cleaning step is a step of removing fine constituent powder, dust, or the like of the upper liner 25 or the lower liner 26 generated in the ultrasonic welding step from the surface of the floppy disk 2, and a disc entry opening provided in the lower half 4. This is performed by applying an air nozzle to the portion 13 and blowing air into the cartridge body 3.

An annular rib 53 provided on the side of the upper half 51 faces the opening 13 for entering the disc, and a gap formed between the concave portion 55 of the annular rib 53 and the inner surface of the lower half 52 is formed. The air blown into the cartridge main body 3 through the above efficiently flows into the disc storage portion 8.
The air that has flowed into the disk storage portion 8 flows out of the cartridge main body 3 through the information signal recording / reproducing openings 16 and 17, and at that time, the upper liner 25 or the lower liner 26 attached to the surface of the floppy disk 2 is used. The fine constituent powder, dust, etc. are blown off from the surface of the floppy disk 2 to be removed, so that cleaning is performed.

Although each of the above-described embodiments has been described with respect to the disk cartridge including the 3.5 inch diameter floppy disk, the present invention is not limited to such a disk cartridge, and may be, for example, an optical disk, a magneto-optical disk or the like. Needless to say, the present invention is also applied to a disk cartridge that rotatably accommodates another disk-shaped recording medium.

[0049]

As described in detail above, according to the disc cartridge of the present invention, the air blown through the disc entrance opening is provided on the annular rib that regulates the center hub of the information recording medium. Since the ink reaches the inside of the cartridge main body sufficiently through the gap forming the flow path, it is possible to reliably remove the fine liner fine constituent powder, dust and the like attached to the information recording medium.

[Brief description of drawings]

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

FIG. 2 is a perspective view from the bottom side of the disc cartridge.

FIG. 3 is a bottom view of the upper half of the disc cartridge.

FIG. 4 is a plan view of a lower half of the disc cartridge.

FIG. 5 is a vertical sectional view of the disc cartridge.

FIG. 6 is a bottom view of the upper half showing the second embodiment of the disk cartridge according to the present invention.

FIG. 7 is a plan view of a lower half of the disc cartridge.

FIG. 8 is a longitudinal sectional view of the disc cartridge.

FIG. 9 is a bottom view of the upper half showing the third embodiment of the disk cartridge according to the present invention.

FIG. 10 is a plan view of a lower half of the disc cartridge.

FIG. 11 is a vertical sectional view of the disc cartridge.

[Explanation of symbols]

 1 ... Disk cartridge 2 ... Floppy disk 3 ... Cartridge body 4 ... Upper half 5 ... Lower half 8 ... Disk storage 13 ... Disk entry opening 14 ... Center hub 16 ... Information signal recording / reproducing opening 17 ... Information signal recording / reproducing opening 18 ... Shutter member 25 ... Upper liner 26 ... Lower liner 27 ... Annular rib 28. ..Gap 31 ... Spindle shaft hole 32 ... Chucking hole

Claims (4)

[Claims] 1. A disk cartridge having a disk housing portion for rotatably housing a disk-shaped information recording medium by abutting and coupling an upper half and a lower half formed of a synthetic resin material with each other. An annular rib for restricting the floating of the information recording medium by regulating a center hub provided in the central portion of the inner wall of one half and assembled in the center hole of the information recording medium, and the inner space of the annular rib and the disc storage portion. A disc cartridge having a gap that forms an air flow path communicating with the disc cartridge. 2. An annular rib having a gap forming an air flow path is constituted by a large number of arc-shaped standing walls which are located on the same circumference and integrally provided on the inner wall of the half. 1. The disk cartridge described in 1. 3. An annular rib having a gap forming an air flow path is formed by a large number of pin-shaped projections located on the same circumference and integrally provided on the inner wall of the half. Item 1. The disc cartridge according to Item 1. 4. The annular rib has a tip edge portion facing the inner wall of the other half as an uneven surface, and between the recess and the inner wall of the other half with the upper half and the lower half joined together. 2. The disk cartridge according to claim 1, wherein a gap forming an air flow path is formed.