Information recording medium cartridge

【0001】

[Technical field to which the invention belongs]

The present invention relates to an information recording medium cartridge containing an information recording medium such as a magnetic disk, an optical disk, a magneto-optical disk, or a phase change type optical disk.

【0002】

[Conventional technology]

As an information recording medium cartridge, for example, the one shown in FIG. 24 is known.

【0003】

The information recording medium cartridge (hereinafter, simply referred to as a cartridge) 101 can rotate an information recording medium (hereinafter, referred to as a disk) 102 such as an optical disk or a magneto-optical disk having recording layers on both the front and back surfaces, and the disk 102. A cartridge case (hereinafter referred to as a shell) 103 housed in the shell 103, and an opening for recording and / or reproduction (hereinafter, simply an opening) provided on the back and surface of the shell 103 so as to be slidably attached to the shell 103. It is equipped with a shutter 105 that opens and closes 104.

【0004】

The shutter 105 includes a first shutter plate 106 that opens and closes an opening 104 on the front surface side of the shell 103, and a second shutter plate 107 that opens and closes an opening 104 on the back surface side of the shell 103. .. The shutter 105 is formed in a substantially U-shape by bending a metal plate, and opens and closes the openings 104 on the front and back surfaces of the shell 103 at the same time.

【0005】

When the cartridge 101 is attached to a recording and / or playback device (hereinafter referred to as a drive device), the shutter 105 is driven by a shutter operating member provided in the drive device, and both the front and back surfaces of the shell 103 are operated. The opening 104 of is opened at the same time.

【0006】

Then, as shown in FIG. 25, in the cartridge 101, the disk 102 is chucked and rotationally driven by the turntable 301 of the drive device through the opening 104 on the back surface side of the shell 103, and the cartridge 101 is rotationally driven. Recording and / or reproduction on the disk 102 is performed by the optical pickup 302 via the opening 104 on the back surface side.

【0007】

By the way, when the disc 101 using the shutter 105 in which the conventional first and second shutter plates 106 and 107 are integrally formed opens the opening 104 on the back surface side of the shell 103 for recording and / or reproduction, Even if it is not directly related to recording and / or reproduction, the opening 104 on the back surface side of the shell 103 is also opened, and dust 303 or the like that has entered the shell 103 from the opening 104 on the front surface side adheres to the upper surface of the disk 102. , There was a problem of accumulation. The adhesion of dust and the like has an adverse effect that cannot be overlooked for a large-capacity disc for high-density recording.

【0008】

As a solution to the above problems, a cartridge 201 using the split shutter shown in FIG. 26 was developed. In the cartridge 201, the shutter 205 has a first shutter plate 206 that opens and closes the opening 204 on the front surface 203a side of the shell 203 and a second shutter plate 207 that opens and closes the opening 204 on the back surface 203b side of the shell 203. The first and second shutter plates 206 and 207 move independently to open and close the opening 204 independently.

【0009】

The first and second shutter plates 206 and 207 are attached to the slide member 210. The slide member 210 is divided into a first slide portion 211 to which the first shutter plate 206 is attached and a second slide portion 212 to which the second shutter plate 207 is attached. The first and second slide portions 211 and 212 are formed by dividing the slide member 210 into two parts perpendicular to the moving direction.

【0010】

When the cartridge 201 using the split shutter is mounted on the drive device, only the second shutter plate 207 is driven by the shutter opening member provided in the drive device, and the back surface 203b side of the shell 203 is operated. Only the opening 204 of the drive device is opened, and as shown in FIG. 27, the disk 202 is chucked by the turntable 301 of the drive device and rotationally driven through the opening 204 on the back surface 203b side of the shell 203. At the same time, the optical pickup 302 is used to record and / or play back on the disc 202. On the other hand, the first shutter plate 206 closes the opening 204 on the surface 203a side of the shell 203 to prevent dust 303 and the like from entering the shell 203 from the opening 204.

【0011】

[Problems to be Solved by the Invention]

By the way, in the cartridge 201 using the conventional split shutter, the first and second slide portions 211 and 212 are formed by simply dividing the slide member 210 into two parts perpendicular to the moving direction, for example. As shown in FIG. 28, the first and second slide portions 211 and 212 are tilted so that the first and second shutter plates 206 and 207 are lifted from the front and back surfaces 203a and 203b of the shell 203. There is a problem that a gap G is generated between the first and second shutter plates 206 and 207 and the front and back surfaces 203a and 203b of the shell 203, which causes dust to enter.

【0012】

[Means for solving problems]

In the present invention, the shutter is provided on one of the front and back surfaces of the cartridge case, a first shutter plate for opening and closing a recording and / or reproduction opening, and a recording and / or recording provided on the other surface. Alternatively, the opening for reproduction is divided into the second shutter plate that opens and closes, and the slide member is attached to the first slide portion to which the first shutter plate is attached and the second shutter plate to be attached. In the information recording medium cartridge divided into the two slide portions, the shutter plate mounting portion formed by dividing the slide member in the moving direction and the slide member are formed on the first and second slide portions. By dividing in the thickness direction, a stage portion is provided on one side of the shutter plate mounting portion so as to project to a length substantially half of the length of the shutter plate mounting portion in the moving direction. The first and second slide portions are tilted by supporting a part of the shutter plate mounting portion of one slide portion of the second slide portion in a state of being overlapped on the stage portion of the other slide portion. It is possible to prevent the first and second shutter plates from rising from the front and back surfaces of the shell.

【0013】

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the information recording medium cartridge of the present invention has (1) an overall schematic configuration, (2) a disc configuration, (3) a shell configuration, (4) a shutter configuration, (5) a slide member configuration, and (6). ) Other examples and (7) Actions will be described separately. (1) Schematic configuration of the entire information recording medium cartridge Fig. 1 is a perspective view of the information recording medium cartridge (hereinafter referred to as the cartridge) 1 with the so-called shutter closed, and FIG. 2 is a perspective view of the information recording medium cartridge 1 as viewed from the back side. A perspective view, FIG. 3 is a perspective view with the shutter on the back surface side open, and FIG. 4 is a perspective view seen from the back surface side. The cartridge 1 is configured as a so-called double-sided cartridge that can record and / or reproduce on both the front and back sides.

【0014】

The cartridge 1 is provided on a disk-shaped information recording medium (hereinafter referred to as a disk) 2, a cartridge case (hereinafter referred to as a shell) 3 for rotatably storing the disk 2, and both front and back surfaces of the shell 3. It includes an opening (hereinafter referred to as an opening) 31 for recording and / or reproduction, and a shutter 4 for opening and closing the opening 31.

【0015】

The shutter 4 has a first shutter plate 41 for opening and closing an opening 31 provided on the front surface side of the shell 3 (upper half 32 side described later) and a back surface side of the shell 3 (lower half 33 described later). It is provided with a second shutter plate 42 that opens and closes the opening 31 provided on the side).

【0016】

The first and second shutter plates 41 and 42 are located between the first position for closing the opening 31 shown in FIGS. 1 and 2 and the position for opening the opening 31 shown in FIGS. 3 and 4. Are designed to move independently.

【0017】

The first and second shutter plates 41 and 42 constituting the shutter 4 are necessary for completely closing the opening 31 which is slightly larger than the openings 31 provided on the front and back surfaces of the shell 3. These first and second shutter plates 41 and 42 have a width W (large) that substantially coincides with and overlaps with each other in the wall thickness direction of the shell 3 at the first position of the size and closing the opening 31. It is formed in. In the embodiment, the same members are used for the first and second shutter plates 41 and 42.

【0018】

The first shutter plate 41 slides in the direction of arrow A from the first position for closing the opening 31 and moves to the second position for opening the opening 31. Further, the second shutter plate 42 slides in the direction of arrow B opposite to the direction of arrow A to move from the first position for closing the opening 31 to the second position for opening the opening 4. It is designed to move.

【0019】

On the front and back surfaces of the shell 3, the moving areas 5 of the first and second shutter plates 41 and 42 are provided on one side of the opening 31 and the index card on the other side. Etc. Labeling area 6 is provided. The first and second shutter plates 41 and 42 are slidably attached to the shell 3 by a slide member 7 which will be described in detail later. (2) Disk Configuration As shown in FIG. 5, the disk 2 has a disk-shaped recording medium main body 21 and a center hub 22 provided in the center of the recording medium main body 21. ..

【0020】

As shown in FIG. 6, for example, the recording medium main body 21 has a recording layer 24 provided on the inner surface of a polycarbonate (PC) substrate 23 and a protective layer 25 provided on the outer surface of the polycarbonate (PC) substrate 23. It is formed by superimposing the recording media 26 and 27 of the substrate and adhering them with the adhesive layer 28. In the disc 2, the center hub 23 is chucked to the turntable 302 of the drive device, and the recording layer 24 of the first recording medium 26 can be recorded and / or played back by the optical pickup device 302 of the drive device. By turning over the disc 2, the optical pickup device 302 enables recording and / or reproduction of the second recording medium 27 on the recording layer 24. The recording medium main body 21 is formed to have a high capacity of several GB to 40 GB (gigabyte).

【0021】

As a matter of course, the center hub 22 is mounted on the recording layer 24 of the first recording medium 26 of the disc 2 by turning it over and mounting the disc 2 on the recording layer 24 of the first recording medium 26. Even when recording and / or playing back on the recording layer 24 of the recording medium 27, the disk 2 can be reliably chucked to the turntable 301 of the drive device. (3) Shell configuration The shell 3 has front, rear, left, and right peripheral walls 34a, 34b, of the upper half 32 and the lower half 33 having the opening 31 provided at the center in the width direction (shutter slide direction). 34c and 34d are formed by abutting each other and connecting them with a plurality of screws 35. The head of the screw 35 can be seen on the back side.

【0022】

In the shell 3, the inside of the front and rear peripheral walls 34a of the upper and lower halves 32 and 33 is the disk storage portion 36, and the outside of the front peripheral wall 34a of the upper and lower halves 32 and 33 is the slide member assembly portion 37. It has become.

【0023】

Then, the front and back surfaces of the recording medium main body 21 of the disc 2 housed in the disc storage unit 36 and the front and back surfaces of the center hub 22 face the openings 31 of the upper and lower halves 32 and 33. ing.

【0024】

The upper and lower shutter slide areas 5 and the label sticking area 6 are provided on the outer surfaces of the upper and lower halves 32 and 33. The shutter slide area 5 is formed at a position substantially lower than the outer surfaces of the upper and lower halves 32 and 33 by approximately the thickness of the first and second shutter plates 41 and 42, and the upper and lower halves 31 When the first and second shutter plates 41 and 42 are superposed on the shutter slide area 5 of 32, the outer surfaces of the upper and lower halves 32 and 33 and the outer surfaces of the first and second shutter plates 41 and 42. And are almost flush with each other and / or slightly lower. Further, the upper and lower halves 32 and 33 of the shutter slide area 5 on the rear peripheral wall 34b side are further lowered shutter end insertion portions 51. Then, as shown in FIG. 7, the end portions 45 of the first and second shutter plates 41 and 42 are inserted into the shutter end portion insertion portion 51, and the end portion 45 is the shutter end portion. The slide guide plate 52 mounted in the insertion portion 51 prevents the upper and lower halves 32 and 33 from being lifted (rolled up) from the outer surface, so that the first and second shutter plates 32 and 33 can be smoothly moved. The slides are guaranteed.

【0025】

Further, the label sticking area 6 is formed at a position lower than the outer surfaces of the upper and lower halves 32 and 33 by approximately the thickness of the sticking sheet, and the sheet is stuck as shown in FIG. When the sheet 62 indicated by the chain double-dashed line is attached to the landing area 6, the outer surfaces of the upper and lower halves 32 and 33 and the outer surface of the sheet are substantially flush with each other or slightly lower.

【0026】

As shown in FIG. 5, a guide protrusion 38 for slidably attaching the slide member 7 is provided on the inner surface of the slide member assembling portion 37 of the upper and lower halves 32 and 33. As shown in FIG. 9, the guide protrusion 38 is located outside the front peripheral walls 34a of the upper and lower halves 32 and 33, and has a predetermined distance D from the front peripheral walls 34a.₁Is formed substantially in parallel. Further, the guide protrusions 38 of the upper and lower halves 32 and 33 have a predetermined interval D in a state where the upper and lower halves 32 and 33 are connected.₂It is designed to face each other with the above interval D₂The assembly leg 77 of the slide member 7, which will be described in detail later, can be inserted between the guide protrusions 38 and 38 of the upper and lower halves 32 and 33 and between the guide protrusions 38 and the front peripheral wall 34a ( See Figure 7).

【0027】

The guide protrusions 38 of the upper and lower halves 32 and 33 are provided with a so-called chamfered inclined surface 38a for facilitating the insertion of the assembled leg portion 77 of the slide member 7. Further, at the central portion of the guide protrusions 38 of the upper and lower halves 32 and 33 in the length direction (slide member moving direction), the guide member 6 and the shutter 4 attached to the guide member 6 close the opening 31. A positioning protrusion 39 for setting at position 1 is provided.

【0028】

The shell 3 is made of a synthetic resin having excellent moldability and mechanical strength, such as polycarbonate (PC) or ABS resin. (4) Shutter configuration The shutter 4 is divided into a first shutter plate 41 that opens and closes the opening 31 of the upper half 32 and a second shutter plate 42 that opens and closes the opening 31 of the lower half 33. ing.

【0029】

The first and second shutter plates 41 and 42 are rectangular shutter bodies having a width W and a length L slightly larger than the opening 31 so that the opening 31 can be completely closed. 43, a slide member mounting portion 44 provided at one end of the shutter main body 43 in the length direction, and the upper and lower halves provided at the other end of the shutter main body 43 in the length direction. It is provided with an end 45 on the side to be inserted, which is inserted into the shutter end insertion portion 51 at one end of the shutter slide areas 5 of 32 and 33.

【0030】

As shown in FIG. 10, the slide member mounting portion 44 is a first bent portion having a width narrower than that of the shutter main body 43, which is connected to one end of the shutter main body 43 at a substantially right angle. 46, a second bent portion 47 connected to the tip of the first bent portion 46 at a substantially right angle in a direction overlapping with the shutter main body 43, and both ends of the tip of the second bent portion 47 described above. It is equipped with a third bent portion (hereinafter referred to as an engaging claw) 48 which is continuously provided at a substantially right angle toward the shutter main body portion 43 side. The first bent portion 46 may be provided with a screw hole 46a, and the first bent portion 46 may be screwed to the slide member through the screw hole 46a with a screw 46b.

【0031】

The end portion 45 on the side to be inserted is formed so as to have a step H with respect to the shutter main body portion 43 so as to be inserted into the shutter end portion insertion portion 51 below the slide guide plate 52. It has become.

【0032】

The first and second shutter plates 41 and 42 are formed by bending a metal plate such as stainless steel or aluminum punched into a predetermined shape, or by using a synthetic resin or the like. In this embodiment, the same members are used for the first and second shutter plates 41 and 42, but for example, the shape of the end portion 45 on the inserted side is changed to intentionally separate members. May be. (5) Configuration of slide member As shown in FIGS. 11 and 12, the slide member 7 is a parting line PL in the slide direction (length direction).₁Parting line PL in the thick direction₂A first slide portion 71 for slidably attaching the first shutter plate 41 to the shell 3 and a second slide portion 72 for slidably attaching the second shutter plate 42 to the shell 3 It is divided into.

【0033】

The first and second slide portions 71 and 72 are formed by a shutter plate mounting portion 73 for mounting either the first shutter plate 41 or the second shutter plate 42 and a bottom portion of the shutter plate mounting portion 73. A shutter mounting portion of the other slide member is mounted on one side portion so as to have a width substantially the same as the width of the shutter mounting portion 73 and a length substantially half the length of the shutter mounting portion 73. A shutter opening member engaging member 75, which is provided on the upper surface of the shutter plate mounting portion 73 on one end side in the sliding direction and with which the shutter opening member (not shown) of the drive device is engaged. A pair of first assembly legs 76 to the shell 3 provided on the lower surface of one end of the shutter plate mounting portion 73 in the sliding direction (the shutter opening member engaging portion 75), and the shutter plate mounting portion 73. A spring provided between a pair of second assembled leg portions 77 provided on the lower surface of the central portion of the above and a pair of first assembled leg portions 76 of the first and second slide portions 71 and 72. It is provided with a locking portion 78. The assembled legs 76, 77 are provided with groove-shaped recesses 79 on the outer surface into which the guide protrusions 38 of the upper and lower halves 32, 33 are introduced.

【0034】

The first and second slide portions 71 and 72 are formed to have the same shape and size, and the shutter plate mounting portion 73 of the first slide portion 71 is placed on the stage portion 74 of the second slide portion 72. Along with the placement, the shutter plate mounting portion 73 of the second slide portion 72 is placed on the stage portion 74 of the first slide portion 71, and the springs provided on the first and second slide portions 71 and 72 are provided. One end and the other end of the spring member (coil spring) 80 are locked to the locking portion 78, respectively.

【0035】

Then, the first and second slide portions 71 and 72 are pulled together by the spring member 80, and the tip of the shutter plate mounting portion 73 of the first slide portion 71 is the tip of the second slide portion 72. The tip of the shutter plate mounting portion 73 of the second slide portion 72 abuts on the shutter opening member engaging portion 75 of the first slide portion 71, and the tip of the shutter plate mounting portion 73 of the second slide portion 72 abuts on the shutter opening member engaging portion 75 of the first slide portion 71. As shown in the above, the first and second slide portions 71 and 72 are in a state of being connected to each other.

【0036】

The tip of the shutter plate mounting portion 73 and the contact portion of the shutter opening member engaging portion 75 are provided with a convex portion 81 and a concave portion 82 that are fitted to each other, and the convex portion 81 and the concave portion 82 are fitted to each other. As a result, the positions of the first and second slide portions 71 and 72 in the combined state are prevented from being displaced (floating).

【0037】

A so-called chamfered inclined surface 83 is provided at both ends on the inner surface side of the first and second shutter plate mounting portions 73, and a claw engaging portion 84 is provided at the lower end of the inclined surface 83. Has been done. The space between the first and second assembled legs 76,76, 77,77 is a storage space for the spring member 80.

【0038】

As shown in FIGS. 12 and 13, the spring locking portion 78 is formed inside the outer surface of the first assembled leg portion 76, and the spring member 80 is formed in the first and second assembly legs 76. It can be mounted so that it fits within the lower surface of the shutter plate mounting portion 73 of.

【0039】

As shown in FIG. 13, between the second assembled leg portions 77, 77 at the center of the bottom surface of the first and second slide portions 71, 72 connected by the spring member 80, the above, A gap 85 is formed in which the positioning protrusion 39 provided at the center of the guide protrusions 38 of the lower halves 32 and 33 is inserted.

【0040】

As shown in FIGS. 14 and 15, the first and second slide portions 71 and 72 connected by the spring member 80 are described in a state where the gap 85 is aligned with the position of the shutter positioning projection 39. It is inserted into the slide member assembly portion 37 between the upper and lower halves 32 and 33 from the assembly leg portion 76,77 side. When the first and second slide portions 71 and 72 are inserted, the inclined surfaces 76a and 77a outside the lower ends of the assembled legs 76 and 77 come into contact with the inclined surfaces 38a of the guide protrusion 38, and FIG. As shown in the above, the assembled legs 76,77 are elastically deformed inward.

【0041】

When the assembled legs 76,77 get over the guide protrusion 38, the assembled legs 76,77 elastically return as shown in FIG. 17, and the outside of the assembled legs 76,77. The guide protrusion 38 is introduced into the groove-shaped recess 79 provided on the side surface, and as shown in FIG. 18, the second assembly leg portion 77 of the first and second slide portions 71 and 72 The shutter positioning protrusion 39 provided at the center of the guide protrusions 38 of the upper and lower halves 32 and 33 intrudes into the gap 85 between the upper and lower halves 32, 33, and the first and second slide portions 71 and 72 are described above. The first and second shutter plates 41 and 42 are set at the first position to close the opening and closing portions 31 of the upper and lower halves 32 and 33.

【0042】

The first and second slide portions 71 and 72 are made of polycarbonate having excellent lubricity and abrasion resistance so as to slide smoothly along the guide protrusions 38 provided on the upper and lower halves 32 and 33. It is made of synthetic resin such as polyacetal or polypropylene. The first and second slide portions 71 and 72 have the same shape and size, that is, they may be configured as the same member, or may be color-coded for assembly.

【0043】

Next, a method of assembling the first and second shutter plates 41 and 42 to the first and second slide portions 71 and 72 will be described.

【0044】

Assembling the first and second shutter plates 41 and 42 to the first and second slide portions 71 and 72 is as shown in FIG. 19, the first and second slide portions 71 and 72. Is assembled to the shell, and then the slide member mounting portion 44 is lowered from above, and the shutter plate mounting portions 73 of the first and second slide portions 71 and 72 are inserted into the slide member mounting portion 44. It is done by.

【0045】

When the second bent portion 47 and the engaging claw 48 of the slide member mounting portion 44 of the first and second shutter plates 41 and 42 are inserted between the first and second slide portions 71 and 72, the figure is shown. As shown in FIG. 20, the engaging claw 48 of the slide member mounting portion 44 abuts on the inclined surface 83, and the engaging claw 48 and the second bent portion 47 are brought into contact with the inclined surface 83 by the inclined surface 83. It is elastically deformed in the direction away from the portion 43 to allow further insertion of the first and second slide portions 71 and 72.

【0046】

When the inner surface of the first bent portion 46 of the first and second shutter plates 41 and 42 is inserted to a position where it abuts on the tip surface of the first and second slide portions 71 and 72, the engagement is performed. The claw 48 deviates from the position of the inclined surface 83.

【0047】

When the engaging claw 48 is disengaged from the inclined surface 83, as shown in FIG. 21, the second bent portion 47 that has been elastically deformed by being pressed by the inclined surface 83 via the engaging claw 48 , The engaging claw 48 is elastically restored and engaged with the claw engaging portion 84, and the first and second shutter plates 41 and 42 are via the first and second slide portions 71 and 72. It will be slidably attached to the shell 3. (6) Other Examples As another example, the first and second shutter plates 41, 42 and the first and second shutter plates 41, 42 and the first and second shutter plates 41, 42 described above are used without using the shutter mounting screws 46b as shown in FIG. The case where the bonding strength of the slide portions 71 and 72 is improved is shown.

【0048】

In the embodiment shown in FIG. 22, a part of the upper surface of the first bent portion 46 of the slide member mounting portions 44 of the first and second shutter plates 41 and 42 is recessed to form a circular recess 91. , A hole 92 is formed in the bottom surface of the recess 91. On the other hand, a convex portion 93 having a diameter slightly larger than that of the hole 92 is projected on the upper surface of the shutter plate mounting portion 73 of the first and second slide portions 71 and 72, and the first bent portion 46 is described above. When superposed on the upper surface of the shutter plate mounting portion 73, the convex portion 93 is press-fitted into the recess 91 through the hole 92 to position the first bent portion 46 and the shutter plate mounting portion 73. It is designed to improve the bond strength of. A large diameter portion 94 for retaining may be provided at the upper end of the convex portion 93.

【0049】

In the embodiment shown in FIG. 23, as in the case of the embodiment shown in FIG. 22, a part of the upper surface of the first bent portion 46 of the slide member mounting portions 44 of the first and second shutter plates 41 and 42. Is recessed to form a circular recess 91, and a hole 92 is formed on the bottom surface of the recess 91. On the other hand, a convex portion 95 having a diameter smaller than that of the hole 91 is projected on the upper surface of the shutter plate mounting portion 73 of the first and second slide portions 71 and 72. Then, the first bent portion 46 is superposed on the upper surface of the shutter plate mounting portion 73, the convex portion 95 is projected into the concave portion 91 through the hole 92, and then the horn of the ultrasonic welding device. The first bent portion 46 and the shutter plate mounting portion 73 are formed by pressing 100 to melt the tip of the convex portion 95 and caulking a head having a diameter larger than that of the hole 92 (not shown). It is designed to improve positioning and joint strength between the two. (7) Operation As shown in FIG. 1, when the cartridge 1 is inserted into the drive device in a posture in which the upper half 32 is up and the lower half 33 is down (hereinafter referred to as a normal posture), the drive device is used. The shutter opening member provided in the above is engaged with the shutter opening member engaging portion 75 of the second slide portion 72, and the second slide portion 72 slides in the direction of arrow B and is shown upside down in FIG. As described above, the second shutter plate 42 attached to the second slide portion 72 is moved to the second position where the opening 31 of the lower half 33 is opened. At this time, one side of the second slide portion 72 is guided by the groove-shaped recess 79 of the assembled leg portions 76 and 77 and the guide protrusions 38 provided on the upper and lower halves 32 and 33. The other side portion is guided by the stage portion 74 of the first slide member 71 and slides smoothly without being tilted.

【0050】

Then, as shown in FIG. 6, the center hub 22 of the disk 2 is chucked and rotated by the turntable 301 of the drive device through the opening 31 of the lower half 33, and is rotated by the optical pickup 302. , Recording and / or reproduction on the recording layer 24 of the first recording medium 26 of the above disc 2 is performed.

【0051】

Further, as shown in FIG. 2, when the cartridge 1 is inserted into the drive device in a posture in which the lower half 33 is on the top and the upper half 32 is on the bottom (hereinafter referred to as the reverse posture), the cartridge 1 is provided in the drive device. The shutter opening member engages with the shutter opening member engaging portion 75 of the first slide portion 72, and the first slide portion 71 has a groove-like portion on one side of the assembled legs 76, 77. Guided by the recess 79 and the guide protrusions 38 provided on the upper and lower halves 32 and 33, the other side portion is guided by the stage portion 74 of the second slide member 72 and slides in the direction of arrow B. As shown inside out in 4, the first shutter plate 41 attached to the first slide portion 71 is moved to the second position where the opening 31 of the upper half 32 is opened. Then, the center hub 22 of the disc 2 is chucked and rotated by the turntable 301 of the drive device through the opening 31 of the upper half 32, and the second disc 2 is rotated by the optical pickup 302. Recording and / or reproduction of the recording medium 27 on the recording layer 24 is performed.

【0052】

Then, the other (upper) opening 31 that is not directly involved in the recording and / or reproduction is closed regardless of whether the recording and / or reproduction is performed in the normal posture or the recording and / or reproduction is performed in the opposite posture. Since it is maintained in this state, it is possible to prevent dust and the like from entering the shell 3 through the other opening 31 and adhering to the surface of the disk 1.

【0053】

When moving the first shutter plate 41 shown in FIG. 3 from the first position to the second position, and when moving the second shutter plate 42 shown in FIG. 4 from the first position to the second position. However, since the moving directions of the first and second shutter plates 41 and 42 are the same, the shutter opening member for opening the first shutter plate 41 is also used as the shutter opening member for opening the second shutter plate 42. it can.

【0054】

[Effect of the invention]

The information recording medium cartridge of the present invention has the following effects.

【0055】

(1) The information recording medium cartridge according to claim 1 is described above by supporting a part of the shutter plate mounting portion of one slide portion of the first and second slide portions with the stage portion of the other slide portion. It prevents the first and second slide portions from inclining each other, thereby preventing the first and second shutter plates from rising from the front and back surfaces of the shell.

【0056】

(2) In the information recording medium cartridge of claim 2, since the stage portion is formed to have substantially the same width as the width of the shutter plate mounting portion, the width of the slide portion is increased due to the presence of the stage portion. It can be prevented. Further, it is possible to prevent the shutter plate mounting portion from falling off from the stage portion and slide the shutter plate mounting portion in a stable state.

【0057】

(3) In the information recording medium cartridge of claim 3, since the first and second slide portions are formed to have the same shape and the same size, both can be shared to reduce the number of parts. ..

[Simple explanation of drawings]

FIG. 1 is a perspective view (shutter closed state) of the cartridge as viewed from the front side.

FIG. 2 is a perspective view (shutter closed state) of the cartridge as viewed from the back side.

FIG. 3 is a perspective view (shutter open state) of the cartridge as viewed from the front side.

FIG. 4 is a perspective view (shutter open state) of the cartridge as viewed from the back side.

FIG. 5 is an exploded perspective view of the cartridge.

FIG. 6 is a cross-sectional view of the disc.

FIG. 7 is a cross-sectional view taken along the line aa of FIG.

8 is a cross-sectional view taken along the line bb in FIG.

FIG. 9 is a cross-sectional view of the front peripheral wall side of the shell.

FIG. 10 is a perspective view of the first and second shutter plates.

FIG. 11 is a perspective view of a slide member.

FIG. 12 is an exploded perspective view of a slide member.

FIG. 13 is a bottom view of a slide member.

FIG. 14 is a perspective view of an assembled shell.

FIG. 15 is a process diagram for assembling a slide member to a shell.

FIG. 16 is a process drawing of assembling a slide member to a shell.

FIG. 17 is a process diagram for assembling a slide member to a shell.

FIG. 18 is a side view of a main part in a state where a slide member is assembled.

FIG. 19 is a process diagram for assembling a shutter plate.

FIG. 20 is a process diagram for assembling a shutter plate.

FIG. 21 is a process diagram for assembling a shutter plate.

FIG. 22 is a cross-sectional view of another embodiment.

FIG. 23 is a cross-sectional view of another embodiment.

FIG. 24 is a perspective view of a cartridge using a conventional integrated shutter.

FIG. 25 is a cross-sectional view of a state of being mounted on a drive device.

FIG. 26 is a cross-sectional view of a main part of a cartridge using a conventional split shutter.

FIG. 27 is a cross-sectional view of a state of being mounted on a drive device.

FIG. 28 is a cross-sectional view showing a problem of a conventional example.

[Explanation of symbols]

1 ... cartridge, 2 ... disc, 3 ... shell, 4 ... shutter, 7 ... slide member, 31 ... opening, 41,42 ... 1st, 2nd Shutter plate, 71,72 ... 1st and 2nd slide parts, 73 ... Shutter plate mounting part, 74 ... Stage part.