JPH076191U - Disc magazine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a compact disc magazine capable of accommodating a plurality of discs without requiring a complicated configuration in a disc device to be mounted. [Structure] The left and right projections 6 projecting inward from the front side of the top plate 5 are provided. A hole 6a is formed in the protrusion 6.
The supporting portion 7 is provided outside the protruding portion 6, and the vertical groove portion 7 a is formed on the side surface of the supporting portion 7. A concave portion 12 corresponding to the protruding portion 6 is provided in front of the lower surface plate 11. Protrusion 6 in recess 12
The protrusion 12a corresponding to the hole 6a is provided. The protrusion 6 of the upper plate 5 is inserted into the recess 12 of the lower plate 11, the protrusion 12a of the recess 12 is engaged with the hole 6a of the protrusion 6, and the protrusion 12a is configured to be openable and closable. A protrusion 16 corresponding to the groove 7a is provided in front of the tray 14. The convex portion 16 and the groove portion 7a
The tray 14 is provided so as to be rotatable in the same direction as the opening / closing direction of the upper plate 5 and the lower plate 11 and movable in the vertical direction by engaging with the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc magazine which can accommodate a plurality of discs and is used by being mounted in a disc device.

[0002]

[Prior art]

 In recent years, disk devices such as CD players and LD players have become very popular, but in particular, disk devices that can store multiple disks are convenient because they do not need to be replaced individually. ing. Such a disc device capable of accommodating a plurality of discs includes a storage part capable of accommodating a plurality of discs and a recording / reproducing part for recording / reproducing the disc, which are separately provided. It has a transport section for transporting the disc between them. Then, from the disks stored in the storage section, a desired disk is selected by the transfer section, and the selected disk is completely pulled out from the storage section and transferred to the recording / reproducing section for recording / reproduction.

The most commonly used storage unit provided in the above disk device is a disk magazine. This disc magazine is box-shaped and has a plurality of partition plates provided therein, and a gap is provided between the partition plates to accommodate a disc. An example of such a conventional disc magazine will be described below with reference to the drawings. That is, as shown in FIG. 21, the conventional disc magazine has a box shape having an opening 1a on one side surface, and the trays 2 as partition plates are arranged in the horizontal direction in multiple layers. ing. A gap is provided between the trays 2 so that the discs 3 can be accommodated in the horizontal direction, and the discs 3 are accommodated in the gaps one by one.

Such a disc magazine 1 is used as follows. The disc device in which the disc magazine 1 is mounted has a transport unit having rollers, a recording / reproducing unit having a turntable and an optical pickup, and the transport unit and the recording / reproducing unit are housed in the disc magazine 1. It is provided so as to be slidable according to the position of the disc 3. First, the disc magazine 1 is inserted into the disc device. Next, the carrying section and the recording / reproducing section are moved to the position of the tray 2 in which the desired disk 3 is stored. Then, a desired disc 3 is pushed out by a disc pushing mechanism provided at the rear part of the disc magazine, then pulled out from the tray 2 by the rollers of the feeding portion, and fed to the recording / reproducing portion side. Then, the ejected disk 3 is set on the turntable of the recording / reproducing unit, and recording / reproducing is performed by the optical pickup. Further, the disc 3 after recording / reproducing is conveyed to the disc magazine 1 side by the conveying section and stored in the original tray 2.

[0005]

[Problems to be solved by the device]

 However, the conventional disc magazine as described above has the following problems. That is, since the respective discs 3 are stored in different heights, in order to pull out a desired disc 3 from the tray 2 and perform recording / reproducing, align the transport unit and the recording / reproducing unit with the tray 4. Need to be installed so that it can be moved. For this reason, the mechanism of the disk device becomes complicated and the manufacturing efficiency is not good.

Further, if the discs 3 are too close to each other, it becomes difficult to pull out the desired discs 3. Therefore, the tray 2 as a partition between the discs 3 must be provided with a certain thickness, The disk magazine 4 becomes thick and space efficiency is poor. In order to deal with this, it is conceivable to use an openable / closable disc magazine as proposed in Japanese Patent Laid-Open No. 63-200354 to make it thinner. However, in this case, since it is necessary to provide a plurality of tray fulcrums in the disc array direction, the structure becomes complicated. Further, the conventional openable and closable disc magazine 4 tends to have a complicated structure of the magazine itself, and is particularly prone to failure when carried.

The present invention has been proposed in order to solve the above problems, and the purpose thereof is not to require a complicated structure in a disk device to be mounted, but to use a small size and a plurality of disks. It is to provide a disc magazine that can be stored.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention according to claim 1 comprises an upper plate and a lower plate which are provided so as to be openable and closable about a rotary shaft and which support a disk in a direction perpendicular to the upper and lower surfaces thereof. A disc magazine having an opening capable of accommodating a plurality of discs between the top plate and the bottom plate and allowing the discs to be taken in and out when the top plate and the bottom plate are opened. A groove or a ridge is provided on one side of the lower surface plate near the rotation axis, and a plurality of disk mounting plates capable of mounting a disk are provided between the upper surface plate and the lower surface plate. The disk is provided in the groove or ridge so that the mounting plate can rotate in the same direction as the upper plate and the lower plate, and can move in a direction substantially perpendicular to the disc surface. Characterized in that a part of the plate is engaged.

[0009]

[Action]

 The operation of the present invention having the above structure is as follows. That is, in the invention according to claim 1, a part of the disk mounting plate is engaged with a groove or a ridge provided on one of the upper plate and the lower plate. Similarly, by engaging multiple disc mounting plates in sequence, the disc mounting plates can be placed in the disc magazine in the same direction as the upper and lower plates without providing a fulcrum for each disc mounting plate. It is mounted so as to be rotatable and movable in a direction substantially perpendicular to the disk surface.

[0010]

【Example】

 An embodiment of the disc magazine of the present invention will be described with reference to the drawings. The rotating shaft described in claim 1 is a projection of the shaft portion, and the disk mounting plate is a tray. In the plan view of this embodiment shown in FIG. 2, the left side is the left side, the right side is the right side, the lower side is the front side, and the upper side is the rear side.

(1) Configuration of the Embodiment The configuration of this embodiment will be described below. That is, as shown in FIG. 1, the disc magazine 4 according to the present embodiment has a thin box shape and has a size capable of accommodating a plurality of discs 3 in multiple layers. The front side edge of the disc magazine 4 is formed in a gentle arc shape. As shown in FIGS. 2 and 3, inside the front surface of the top plate 5 of the disc magazine 4, there are provided one protruding portion 6 protruding inside the disc magazine 4 on the left side and one protruding portion 6 on the right side. Has a hole 6a formed therein. Further, side plates 8a are provided on the left and right side surfaces of the upper plate 5, as shown in FIG. Then, behind the right side edge of the upper surface plate 4, as shown in FIG. 2, a prism-shaped lock member 9 is provided. The lock member 9 is provided so as to be rotatable inward about its front end as an axis. Then, as shown in FIG. 5, the rear end portion of the lock member 9 is a pressed portion 9a having an inclination angle so as to rotate inward when pressed. Further, on the right side surface of the lock member 9, an engaging portion 9b bent in a key shape is provided on the right side. The lower end of the engaging portion 9b is provided with an inclination angle so that it can be brought into contact with a part of the lower surface plate 11 and engage with an engaged portion 13 described later smoothly. The lock member 9 is biased outward by a spring (not shown). Further, as shown in FIG. 6, behind the upper surface plate 4, a rectangular blind plate 5a that is long in the left-right direction is provided in a direction perpendicular to the upper surface plate 5.

On the other hand, as shown in FIGS. 2 and 3, a shaft portion 12 corresponding to the protruding portion 6 of the upper surface plate 5 is provided in the front inside of the lower surface plate 11 of the disc magazine 4, and the shaft portion 12 is provided with the shaft portion 12. The protrusion 12a corresponding to the hole 6a of the protrusion 6 is provided. Further, a support portion 7 protruding in the same direction as the protrusion 6 is provided at a position corresponding to the outside of the protrusion 6 of the upper surface plate 5, and an outer surface of the support portion 7 has an outer surface as shown in FIG. A vertical groove portion 7a is formed. Then, behind the right side edge of the lower surface plate 11, as shown in FIGS. 1 and 4, an engaged portion 13 which is a hole corresponding to the engaging portion 9b of the lock member 9 is provided. Further, side plates 8b are provided on the left and right side surfaces of the lower plate 11. As shown in FIG. 2 and FIG. 3, the upper plate 5 and the lower plate 11 are formed by engaging the protrusion 12a of the shaft portion 12 provided on the lower plate 11 with the hole 6a of the protrusion 6. The protrusion 12a is configured to be openable and closable about the axis. When the upper plate 5 and the lower plate 11 are closed, the engaging portion 9b of the lock member 9 is engaged with the engaged portion 13 of the lower plate 11 as shown in FIGS. . Further, there is an opening 11a in the rear of the disc magazine 4 between the upper surface plate 5 and the lower surface plate 11, and this opening 11 is provided on the upper surface plate 5 as shown in FIG. It is blocked by 5a.

The structure of the tray 14 provided between the upper plate 5 and the lower plate 11 configured as described above will be described below. That is, as shown in FIGS. 8A and 8B, the tray 14 is a disk-shaped thin plate, and an arcuate notch 14a is provided in the rear of the tray 14. In front of the tray 14, a convex portion 16 corresponding to the groove portion 7a formed in the support portion 7 of the lower surface plate 11 is provided. By engaging the convex portion 16 with the groove portion 7a, the tray 14 is moved to the upper surface plate. 5 and the lower plate 11 can be rotated in the same direction as the opening / closing direction. That is, as shown in FIG. 7, the plurality of trays 14 are attached by inserting the respective convex portions 16 into the groove portions 7 a provided on the left and right sides of the lower plate 11, respectively. A tray positioning pin 14b protruding leftward is provided on the left side edge of the tray 14, and a claw 14c protruding leftward is provided in front of the tray positioning pin 14b. Further, as shown in FIG. 9, an L-shaped support piece 14d protruding downward is provided on the right rear side of the tray 14. The end face of the support piece 14d on the disc insertion side is tapered. A gap having substantially the same thickness as the disc 3 is provided between the support piece 14d and the tray 14, and the disc 3 is sandwiched in this gap. Further, each tray 14 is provided with a rectangular hole 14e corresponding to the support piece 14d provided on the upper tray 14.

Further, on the lower surface of the left side edge of the tray 14, as shown in FIG. 2, an arcuate arm 15 is provided along the circumference of the tray 14. As shown in FIG. 10, the arm 15 is rotatably provided with an arm rotating shaft 15e near the center thereof. A discharge portion 15a and a claw 15b protruding leftward are provided in front of the arm 15, and both ends of the coil spring 10 are engaged with the claw 15b and the claw 14c of the tray 14 (see FIG. 2). . Further, an L-shaped hook 15c protruding leftward is provided behind the arm 15. On the right side of the second half of the arm 15, a disc guide 15d is provided along the edge of the tray 14. As shown in FIG. 11, a gap having a thickness substantially equal to that of the disc 3 is provided between the disc guide 15d and the edge of the tray 14, and the disc 3 is sandwiched in this gap. Further, a taper-shaped guide pin 17 that widens toward the tray 14 side is attached to the upper surface of the rear end of the arm 15 such that its central axis is perpendicular to the tray 14. The guide pin 17 has a tapered shape so that the surface of the disc 3 is not scratched by rubbing the tray 14, and the insertion and withdrawal work of the disc 3 can be smoothly performed. This is so that, when sliding on the taper surface, it can be pressed against the disk guide 15d side.

As shown in FIG. 2, a plurality of such trays 14 are stacked between the upper surface plate 5 and the lower surface plate 11, and the intervals between the trays 14 are as shown in FIG. Further, it is held by the disc guide 15d of the arm 15 and the support piece 14d of the tray 14.

As shown in FIG. 13, the disc device to which the disc magazine 4 is mounted is provided with a mounting portion 18 which is a rectangular hole for mounting the disc magazine 4. In the vicinity of the mounting portion 18, a magazine opening / closing mechanism 19 for opening / closing the disc magazine 4, a disc transport mechanism 20 for transporting the disc 3 in the disc magazine 4, and a height of each tray 2 for the disc transport mechanism 20. A tray positioning mechanism 21 that adjusts to match and a disc ejection mechanism 22 that ejects the disc 3 from the tray 2 are provided. The magazine opening / closing mechanism 19 is provided with a pressing portion 19b protruding toward the inside of the disc device at one end of a doglegged rotation plate 19a, so that the opposite end of the rotation plate 19 is located on the right side surface of the disc device. It is rotatably installed below. Further, since the pressing portion 19b side of the rotating plate 19a is biased forward by a spring (not shown), the rotating plate 19a comes close to the pressing portion 19b when the disc magazine 4 is not mounted. And sleeping. The pressing portion 19b is in a position where it abuts against the pressed portion 9a of the lock member 9 when the disc magazine 4 is mounted.

The disk transport mechanism 20 is composed of rollers 20a provided on the left and right inside the disk device and a base 20b provided below each roller 20a. The roller 20a is provided so as to project inward in a direction parallel to the bottom surface of the disk device, and is rotatable by a motor (not shown). The base 20b is a rectangular parallelepiped member provided on the bottom surface of the disk device, and a gap for sandwiching the disk 3 is provided between the upper surface and the roller 20a.

The tray positioning mechanism 21 is composed of a columnar positioning cam 21a vertically provided on the left side surface of the disk device. The positioning cam 21a is rotatably provided by a motor (not shown), and a plurality of cam grooves 21b that engage with the tray positioning pins 14b of the tray 2 when the disc magazine 4 is attached are provided on the side surface thereof. Has been. The cam groove 21b is provided with a step formed by a gentle curve so that the height of the tray positioning pin 14b is changed by the rotation of the positioning cam 21a.

Further, the disc ejecting mechanism 22 is provided on the left side surface of the disc device, which is a slender plate 22a which is an elongated plate which is slidably movable back and forth by a motor (not shown), and in front of the slide plate 22a. And the engaging plate 22b that engages with the hook 15c of the arm 15 provided on the tray 14 when the disc magazine 4 is mounted.

(2) Operation of the Embodiment The operation of this embodiment having the above-described configuration is as follows. That is, when the upper surface plate 5 and the lower surface plate 11 are in the closed state, as shown in FIGS. 1 and 4, the engaging portion 9b of the lock member 9 and the engaged portion 13 of the lower surface plate 11 are engaged with each other. And it is locked. Next, as shown in FIG. 14, the pressed portion 9a of the lock member 9 is pushed with a finger to release the engagement between the engaging portion 9b and the engaged portion 13, and as shown in FIGS. The face plate 5 and the lower face plate 11 are opened by rotating the protrusion 12a as an axis. Then, as shown in FIG. 17, the blind plate 5a retracts from the opening 11a, and the internal tray 14 becomes visible. Therefore, the disc 3 is inserted through the opening 11a, and the work is performed as follows. First, as shown in FIG. 12, the left edge of the disc 3 should be in the gap between the disc guide 15d and the tray 14, and the right edge of the disc 3 should be between the support piece 14d and the tray 14. Make sure to enter the gap. At this time, the left end portion of the disk 3 comes into contact with the guide pin 17, but since the guide pin 17 has a tapered shape that expands toward the tray 14 side, the disk 3 is biased toward the disk guide 15d side while being guided by the guide pin 17. Glide on the side. Then, as shown in FIG. 14, as the insertion of the disc 3 progresses, the guide pin 17 retracts to the left, and the arm 15 rotates against the biasing force of the coil spring 10. When the midpoint of the disc 3 passes over the guide pin 17, the guide pin 17 returns to the inside so as to take in the disc 3 by the biasing force of the coil spring 10, and the disc 3 is stored on the tray 14. At this time, the front end of the disk 3 comes into contact with the discharge portion 15a of the arm 15. When the upper surface plate 5 and the lower surface plate 11 are closed in this state, the engaging portion 9b and the engaged portion 13 are engaged with each other, and the closed state is locked. Further, since the opening 11a is closed again by the blind plate 5a, the internal disk 3 is protected.

The disc magazine 4 accommodating the discs 3 is mounted on the mounting portion 18 of the disc device from the side of the blind plate 5a. Then, the pressed portion 9a of the lock member 9a provided on the upper surface plate 5 comes into contact with the pressing portion 19b in front of the rotating plate 19a. At this time, the pressed portion 9a is pressed, the lock member 9 rotates inward, and the engaging portion 9b disengages from the engaged portion 13 of the lower surface plate 11. When the disc magazine 4 is further inserted, the pressing portion 19b of the rotating plate 19a is urged rearward by the pressing force at the time of insertion, but the opposite end of the rotating plate 19a is rotatably provided in the disc device. Therefore, the rotating plate 19a rotates so as to stand in the direction of the arrow in FIG. 4, and the pressing portion 19b moves upward. At this time, since the engagement between the engaging portion 9b and the engaged portion 13 has already been disengaged, the upper surface plate 5 is pushed up by the pressing portion 19b and pivotally opens with the protrusion 12a as an axis. Then, the upper plate 5 is pushed up and the strip plate 5a is also retracted upward, so that the disc 3 inside the disc magazine 4 can be taken in and out. In this state, the front of the disc magazine 4 is exposed from the mounting portion 18, but the inner disc 3 is protected by the side plates 8a and 8b provided on the side faces of the upper plate 5 and the lower plate 11.

Then, when the disc magazine 4 is mounted on the disc device and fixed by an appropriate means, the tray positioning pin 14b of the tray 14 engages with the cam groove 21b of the positioning cam 21 and the hook 15c of the arm 15. Engages with the engaging plate 22b of the slide plate 22a. In this state, the positioning groove 21 is rotated by the motor to rotate the cam groove 21b. Then, the height of the tray positioning pin 14b changes according to the height of the cam groove 21b, and as shown in FIGS. 18, 19, and 20 (the blind plate 5a and the side plates 8a and 8b are omitted in the drawings). The height position of the tray 14 accommodating the desired disk 3 is set so as to correspond to between the roller 20a and the base 20b. Then, by slidingly moving the slide plate 22a, the hook 15c engaged with the engagement plate 22b is biased forward to rotate the arm 15. Then, the ejecting portion 15a of the arm 15 moves rearward, the disc 3 accommodated in the tray 14 is pushed out, and both sides behind the disc 3 are sandwiched between the roller 20a and the base 20b. Further, by rotating the roller 20a, the disc 3 is pulled out from the tray 14 and conveyed to the recording / reproducing unit of the disc device, where the recording / reproducing of the disc 3 is performed.

Next, the disc 3 after recording / reproducing is stored in the tray 14 as follows. That is, the disc 3 sent from the recording / reproducing unit is conveyed in the opposite direction by the roller 20a. Then, both sides of the disc 3 are supported by the disc guide 15d of the arm 15 and the support piece 14d of the tray 14, and at the same time, the left end portion of the disc 3 contacts the guide pin 17 at the rear end of the arm 15. . After that, as the transportation of the disc 3 progresses, the disc 3 is stored on the tray 14 in the same manner as the above-mentioned disc storage work.

Further, when the disc magazine 4 is pulled out from the mounting portion 18, the upper surface plate 5 and the lower surface plate 11 are closed, and the engaging portion 9b of the lock arm 9 and the engaged portion 13 of the lower surface plate 11 are engaged and closed. The state is locked.

(3) Effects of the Embodiment The effects of this embodiment as described above are as follows. That is, the tray 14 can be attached by a simple process in which the convex portion 16 is engaged with the groove portion 7 a of the upper surface plate 5 and the lower surface plate 11 is assembled to the upper surface plate 5. Therefore, the structure is simple and the assembling efficiency is good.

Further, since the tray 14 storing the desired disc 3 can be moved in accordance with the disc transport mechanism 20 and the recording / reproducing unit, it is necessary to move the disc transport mechanism 20 and the recording / reproducing unit. And the mechanism of the disk device can be simplified.

Further, since only the tray 14 in which the desired disk 3 is stored is lifted when selecting a disk, the disks 3 may be close to each other during storage. Therefore, the disk magazine can be made thinner and space efficient.

The lock arm 9 that locks the closed state of the disc magazine 4 that engages with the groove 7 a of the top plate 5 has its rear end 9 a at the rear of the disc magazine 4 from the side of the disc magazine 4. Since it does not protrude, it will not accidentally be pushed open when carrying.

Further, since the disc magazine 4 is opened by the insertion force when the disc magazine 4 is inserted, the device provided on the disc device side, such as the magazine opening / closing mechanism described above, can be simplified.

It should be noted that the present invention is not limited to the above-described embodiment, and the specific shapes and dimensions of each member can be changed as appropriate. For example, the groove portion 7a provided on the upper surface plate 5 may be a raised portion, and in that case, a shape capable of engaging with the raised portion may be provided on a part of the tray 2.

[0031]

[Effect of device]

 According to the disc magazine of the present invention as described above, it is possible to mount an openable and closable upper plate and a lower plate by a simple structure in which a groove portion or a raised portion with which one end of the disc mounting plate engages is provided. It is possible to provide a small-sized disc magazine capable of accommodating a plurality of discs without requiring a complicated configuration for the disc device.

[Brief description of drawings]

FIG. 1 is a rear perspective view showing a closed state in an embodiment of a disc magazine according to the present invention.

FIG. 2 is a plan view showing a closed state of the disc magazine shown in FIG.

FIG. 3 is an enlarged plan view showing the rear of the disc magazine of FIG.

FIG. 4 is a right side view showing the disc magazine of FIG.

5 is a plan view (A), a right side view (B), and a front view (B) showing a lock member in the disc magazine of FIG.

6 is a front perspective view showing a closed state of the disc magazine of FIG. 1. FIG.

7 is an enlarged perspective view showing a shaft portion, a protrusion portion, a support portion and a protrusion portion in the disc magazine of FIG.

FIG. 8 is a plan view (A) and a right side view (B) showing a tray in the disc magazine of FIG.

9 is an enlarged front view showing the positional relationship between the tray, the disc, and the support piece in the disc magazine of FIG.

10 is a plan view (A) and a right side view (B) showing an arm in the disc magazine shown in FIG.

11 is an enlarged front view showing the positional relationship between the tray, the disc, the guide pin, and the disc guide in the disc magazine of FIG.

FIG. 12 shows a tray in the disc magazine of FIG.
Front view showing the state with a disc installed

FIG. 13 is a perspective view showing an outline of a disc device in which the disc magazine of FIG. 1 is mounted.

FIG. 14 is a plan view showing a state in which the disc magazine shown in FIG. 1 is opened.

FIG. 15 is a right side view showing a state where the disc magazine of FIG. 1 is opened.

16 is a rear perspective view showing a state where the disc magazine of FIG. 1 is opened.

FIG. 17 is a front perspective view showing a state where the disc magazine of FIG. 1 is opened.

18 is a left side view of the disc magazine shown in FIG. 1 when selecting discs stored in the tray on the lower plate side.

FIG. 19 is a left side view of the disc magazine shown in FIG. 1 when selecting a disc stored in the central tray.

20 is a left side view of the disc magazine shown in FIG. 1 when selecting discs stored in the tray on the upper plate side.

FIG. 21 is a perspective view showing an example of a conventional disc magazine.

[Explanation of symbols]

 1, 4 ... Disc magazine 1a, 11a ... Opening portion 2 ... Tray 3 ... Disc 5 ... Top plate 5a ... Blind plate 6 ... Projection portion 6a ... Hole 7 ... Support portion 7a ... Groove portion 8a, 8b ... Side plate 9 ... Lock member 9a ... Pressed part 9b ... Engaging part 10 ... Coil spring 11 ... Bottom plate 12 ... Shaft part 12a ... Protrusion 13 ... Engagement part 14 ... Tray 14a ... Notch 14b ... Tray positioning pin 14c, 15b ... Claw 14d ... Support Piece 14e ... Hole 15 ... Arm 15a ... Ejection portion 15c ... Hook 15d ... Disk guide 15e ... Arm rotation shaft 16 ... Convex portion 17 ... Guide pin 18 ... Mounting portion 19 ... Magazine opening / closing mechanism 19a ... Rotation plate 19b ... Pressing portion 20 ... Disc transport mechanism 20a ... Roller 21 ... Tray positioning mechanism 21a ... Positioning cam 21b ... Cam groove 22 ... Tray ejection mechanism 22 ... slide plate 22b ... engagement plate

Claims (1)

[Scope of utility model registration request] 1. An upper surface plate and a lower surface plate that are provided so as to be openable and closable about a rotation axis and support a disk in a direction perpendicular to the upper and lower surfaces thereof, and a plurality of upper surface plates and lower surface plates are provided between the upper surface plate and the lower surface plate. In a disc magazine which is capable of accommodating a disc and is formed with an opening through which the disc can be taken in and out when the top plate and the bottom plate are opened, a groove portion near one of the rotation shafts of one of the top plate and the bottom plate. Alternatively, a raised portion is provided, and a plurality of disc mounting plates capable of mounting discs are provided between the upper surface plate and the lower surface plate, and the disk mounting plate rotates in the same direction as the upper surface plate and the lower surface plate. A part of the disc mounting plate is engaged with the groove or the ridge so that the disc can be moved in a direction substantially perpendicular to the disc surface. School magazine.