JP2008234720A - Disk conveying method, disk cartridge, and information recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately convey a flexible disk in a short period of time. <P>SOLUTION: When a disk holder 30 is pulled out from an internal space of a casing 11, the disk holder 30 is bent together with an optical disk 20 stored inside. Thus, the optical disk 20 is stably held between a pair of sheet members 31 and 35 to be bent. Thus, when the optical disk 20 is pulled out from the internal space, the relative movement thereof to/from the disk holder 30 is effectively prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disk transport method, a disk cartridge, and an information recording / reproducing apparatus. More specifically, the present invention relates to a disk transport method for transporting a flexible disk, a disk cartridge for housing a flexible disk, and the disk. The present invention relates to an information recording / reproducing apparatus including a cartridge.

  In recent years, with the digitization of information, there is an increasing demand for higher density of information recorded on a disk as a recording medium. For example, in the field of optical discs, one of the basic methods for increasing the density of information is to reduce the spot diameter of laser light focused on the recording layer of the optical disc when recording and reproducing information. It is given to.

  When recording and reproducing information with respect to the optical disk by narrowing down the laser beam, it is important to suppress the vibration of the surface when the optical disk is rotated, that is, the vibration of the surface to some extent. Therefore, when a flexible sheet is used as the base material of the optical disk and information is recorded on the optical disk, surface vibration is caused by applying an aerodynamic force to the rotating optical disk. The apparatus which suppresses is proposed (for example, refer patent documents 1-3). In addition, when a flexible sheet is used as the base material of the optical disk, there is an advantage that the optical disk itself becomes thin. For example, as shown in Non-Patent Document 1, a plurality of flexible optical disks are stored. This has led to the appearance of disk cartridges with a larger recording capacity per unit volume.

  A flexible optical disk (hereinafter abbreviated as a flexible disk) used in the above apparatus is difficult to handle because the disk substrate is a soft thin film sheet, and is stored in a tray or case. There is a need to handle with. However, when the flexible disk is stored in the tray or the like, the flexible disk may move relative to the tray for some reason. For example, when the flexible disk is transported together with the tray or the like. For example, it is necessary to consider that the acceleration of the tray during the transport operation is as small as possible so that inertial force does not act on the flexible disk. For this reason, since the upper limit of the conveyance speed of the flexible disk is determined, for example, it takes a certain amount of time to load the flexible disk onto the spindle. In an apparatus that selectively takes out one flexible disk and repeatedly conveys it to a spindle, the waiting time has been significantly prolonged.

JP 2005-317913 A JP 2006-107698 A JP 2006-107699 A MP25 (ODS: Optical Data Storage) announced by ODS2006 “Nanoprinted Thin Film Optical Discs TB Cartridge and Compact Auto Disk Changer Named as SVOD”

  The present invention has been made under such circumstances, and a first object of the invention is to provide a disk transport method capable of transporting a flexible disk in a short time with high accuracy.

  A second object of the present invention is to provide a disc cartridge capable of accurately inserting and removing a flexible disc in a short time.

  A third object of the present invention is to provide an information recording / reproducing apparatus capable of starting either recording or reproducing information with high accuracy in a short time with respect to a disk having a flexible disk. It is in.

  From a first aspect, the present invention is a disk transport method for transporting a flexible disk, the step of sandwiching the disk with a set of flexible sheets; Bending a set of sheets together with the disk.

  According to this, a set of sheets sandwiching a flexible disk is curved, so that a frictional force between the disks increases, and the frictional force causes the disk to form a set of sheets. Be bound. Therefore, it becomes possible to convey the disc together with the sheet at high speed.

  From a second point of view, the present invention is a disk transport method for transporting a flexible disk, a holding step for bending and holding the disk; and a transport for transporting the disk held curved. And a disc conveying method including:

  According to this, the disc is conveyed in a curved state. Therefore, the disk can be conveyed at high speed.

  According to a third aspect of the present invention, there is provided a disk cartridge for accommodating a flexible disk, wherein the disk is sandwiched between a set of flexible sheets, and the disk and the set of sheets are sandwiched. It is a disc cartridge that is housed in a curved state.

  According to this, a set of sheets sandwiching a flexible disk is curved, so that a frictional force between the disks increases, and the frictional force causes the disk to form a set of sheets. Be bound. Therefore, it becomes possible to insert and remove the disc together with the sheet with respect to the casing.

  According to a fourth aspect of the present invention, there is provided a disk cartridge for accommodating a flexible disk, the disk holder including a pair of sheets sandwiching the disk; and the disk sandwiched between the pair of sheets. A disc cartridge comprising: a mechanism for controlling a curved state of the disc holder stored in a closed state; and a casing for detachably storing the disc holder.

  According to this, by bending the disc holder in which the flexible disc is stored, the disc holder in which the disc is stored can be taken in and out of the casing at high speed. Further, when the disc holder is accommodated in the casing, the disc holder can be accommodated without applying excessive force to the disc by leveling the disc holder.

  According to a fifth aspect of the present invention, there is provided an information recording / reproducing apparatus for performing at least one of information recording and reproduction with respect to a flexible disk, the disk cartridge of the present invention; An information recording / reproducing apparatus comprising: a processing device that performs at least one of information recording and reproduction; and a transport device that transports the disk between the disk cartridge and the processing device.

  According to this, the information recording / reproducing apparatus includes the disk cartridge of the present invention. Accordingly, it becomes possible to quickly store or remove the disc from the disc cartridge, and as a result, it is possible to start recording or reproducing information on the disc in a short time with high accuracy. .

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a disk cartridge 10 and a recording / reproducing unit 50 included in the disk device 100 according to the present embodiment. The disc device 100 is a device capable of recording and reproducing information with respect to a flexible optical disc 20, and as shown in FIG. 1, a disc cartridge 10 that houses a plurality of optical discs 20, and an optical disc 20, a recording / reproducing unit 50 for recording and reproducing information is provided.

  As shown in FIG. 2, as the optical disk 20, for example, a circular plate-shaped polycarbonate sheet 20a having a thickness of 90 μm, an outer diameter of 120 mm, and a circular hole formed in the center is used as a disk substrate. A flexible optical disk is used in which a recording layer is formed in a region 20b having an inner diameter of 50 mm to an outer diameter of 116 mm shown colored in FIG.

In the recording layer, a groove having a stamper pitch of 0.6 μm and a width of 0.3 μm is first thermally transferred to a region 20b of the sheet 20a, and then an Ag reflective layer having a thickness of 120 nm and a 7 nm thick (ZrO ₂ -Y) are sequentially formed by sputtering. _{A 2} O ₃ ) —SiO ₂ layer, a 10 nm thick AgInSbTeGe layer, a 25 nm thick ZnS—SiO ₂ layer, and a 10 nm thick Si ₃ N ₄ layer are formed.

  Further, on the front and back surfaces of the optical disc 20, a transparent protective film having a thickness of 10 μm is formed by irradiating the spin-coated UV resin with ultraviolet rays to protect the recording layer and the disc substrate. For example, a circular plate 20c having a thickness of 0.1 mm, an outer diameter of 29 mm, and a circular hole having an inner diameter of 15 mm formed at the center is attached so that the center thereof coincides with the center of the sheet 20a. In the present embodiment, permalloy (magnetic material) is adopted as the material of the circular plate 20c.

  Returning to FIG. 1, the disk cartridge 10 is a disk cartridge that can accommodate, for example, three flexible optical disks 20. The disk cartridge 10 stores a rectangular parallelepiped casing 11 and the optical disk 20. It has three disk holders 30 and the like that are accommodated inside and out.

  The casing 11 is a hollow member in which an opening 11a whose longitudinal direction is the X-axis direction is formed on the surface on the -Y side, and as shown in FIG. The four guides 12A, 12B, 12C, 12D extending in the direction are fixed at equal intervals along the Z-axis direction, and the + X side inner wall faces the guides 12A, 12B, 12C, 12D The four guides 13A, 13B, 13C, 13D extending in the Y-axis direction are fixed at equal intervals along the Z-axis direction.

  These guides 12A to 12D are inclined so that the + X side end is positioned below the −X side end, and the guides 13A to 13D are positioned at the −X side end below the + X side end. In such a state that it is inclined, it is fixed to the inner wall surface of the casing 11. In this embodiment, each guide 12A-12D, 13A-13D is inclined about 10 degrees with respect to the XY plane. The guides 12A to 12D and 13A to 13D may be formed as an integrated curved plate in which the guides 12A and 13A, the guides 12B and 13B, the guides 12C and 13C, and the guides 12D and 13D are curved in the X direction. For example, instead of the guides 12A to 12D and 13A to 13D, the casing 11 is provided with a curved plate having a curvature radius of 400 mm, so that the disk holder 30 is held in a curved state equivalent to the present embodiment. Can do.

  4A is a perspective view of the disk holder 30, and FIG. 4B is an exploded perspective view of the disk holder 30. FIG. 4A and 4B, the disc holder 30 includes a set of sheet members 31, 35 that sandwich the optical disc 20 from one side and the other side (upper and lower sides), and the sheet member 31. A pair of locking members 32 and the like are attached.

  The sheet member 31 is a sheet-like member made of, for example, polyethylene terephthalate having a square shape in plan view and flexible, for example, 0.1 mm thick. The sheet member 31 has a U-shaped slot 31a extending from the center to the + X side end. As shown in FIG. 5, a plurality (seven) positioning members 33 are attached to the upper surface of the sheet member 31 so that the longitudinal direction is the circumferential direction so as to surround the optical disk 20 to be placed. Yes.

  The set of locking members 32 are members made of a flexible material and having the longitudinal direction as the Y-axis direction, for example, like the sheet member 31. Each of the locking members 32 is formed by bonding the + X side end of the lower surface of the locking member 32 and the + X side end of the upper surface of the sheet member 31 on the + Y side and the −Y side of the slot 31a. 31 is attached.

  Similar to the sheet member 31, the sheet member 35 is a flexible sheet-like member that is square in plan view. The sheet member 35 has an opening 35a having a diameter of about 30 mm at the center, and a pair of rectangular cutouts 35b at the + X side end. The sheet member 35 has a dimension in the Y-axis direction larger than that of the sheet member 31, and a stopper portion 35 c that protrudes in the + X direction and the −X direction is formed at the corner portion on the + Y side. A square tag 35d extends in the −Y direction through a substantially triangular protruding portion 35e at the −Y side end. For example, as shown in FIG. 3, the tag 35 d is provided at a different position for each disk holder 30 accommodated in the disk cartridge 10.

  As described above, the sheet member 31 and the sheet member 35 are bonded to the −X side end portion of the upper surface of the sheet member 31 and the −X side end portion of the lower surface of the sheet member 35, which are colored and shown in FIG. Is integrated. Thereby, as shown in FIG. 6 as an example, the disc holder 30 sandwiches the optical disc 20 between the sheet member 31 and the sheet member 35, and the −X side end portion of the locking member 32 becomes the notch portion 35b of the sheet member 35. By locking, the optical disk 20 can be stored between the pair of sheet members 31 and 35. In this case, in the optical disc 20, the circular plate 20 c is inserted into the opening 35 a provided in the sheet member 35, and the outer edge of the optical disc 20 is surrounded by the positioning member 33.

  As shown in FIG. 3, the disk holder 30 configured as described above has the + X side and −X side outer edges thereof adjacent to each other in the vertical direction through the opening 11 a of the casing 11. By being inserted between the guides, the guides 12A to 12D and the guides 13A to 13D are accommodated in the internal space of the casing 11 in a curved state so as to protrude downward due to the inclination of the guides 13A to 13D. Further, as shown in FIG. 1, the stopper portion 35 c provided on the sheet member 35 is configured such that when the disk holder 30 is pulled out from the opening portion 11 a of the casing 11 in the −Y direction, the inner wall surface of the casing 11 and the like. The disc holder 30 is prevented from falling off from the casing 11 by being engaged with a not-illustrated engaging portion provided in FIG. In the present embodiment, the disc holder 30 is housed inside the casing 11 in a curved state with a curvature radius of 700 mm, for example.

  Returning to FIG. 1, the recording / reproducing unit 50 is disposed in the vicinity of the −Y side of the disk cartridge 10 and includes a spindle 52 and a pickup 54.

  The spindle 52 is a stepped cylindrical member having a cylindrical large-diameter portion and a small-diameter portion provided at the upper end of the large-diameter portion. The optical disk 20 is chucked by the spindle 52 by inserting the small diameter portion of the spindle 52 into the circular hole of the circular plate 20c and supported from below by the upper surface of the large diameter portion, and the spindle 52 is rotated by a drive mechanism (not shown). By doing so, for example, it is rotated at a high speed in a range of about 4000 to 15000 rpm.

  The pickup 54 is disposed so as to be positioned below (−Z side) the optical disk 20 chucked by the spindle 52, and a pickup having a known configuration including a light source, an optical system including an objective lens, a light receiving element, and the like is used. Yes. The pickup 54 condenses laser light on the recording surface of the rotating optical disk 20 and receives information reflected from the recording surface to read (reproduce) information from the optical disk 20 and write information to the optical disk 20 ( Recording). Then, it is driven in the Y-axis direction by a pickup driving device (not shown).

  Further, the recording / reproducing unit 50 can be moved in the Z-axis direction and the Y-axis direction by, for example, a driving device (not shown).

  Next, an operation when information is recorded and reproduced on the optical disk 20 by the disk device 100 described above will be described with reference to FIGS. When the disk device 100 receives an instruction to record or reproduce information on the optical disk 20 from, for example, a host device or a user, the disk device 100 matches the instruction content in the disk holder 30 housed in the casing 11 by a drawing device (not shown). For example, as shown in FIG. 1, the disk holder 30 is pulled out from the opening 11 a of the casing 11 by grasping the protruding portion 35 e formed on the sheet member 35 of the disk holder 30 and pulling in the −Y direction. As a result, the entire sheet member 31 is pulled out from the internal space of the casing 11. While the disc holder 30 is being pulled out, the overhanging portion 35e is held in a state of being curved downward and convex by the pulling device.

  Next, by raising the recording / reproducing unit 50 positioned below the pulled-out disk holder 30, the small diameter portion of the spindle 52 is inserted into the optical disk 20 via the slot 31a as shown in FIG. To the circular plate 20c. Thereby, the optical disk 20 is chucked by the spindle 52.

  Next, as shown in FIG. 7B, the locking members 32 respectively locked to the set of cutout portions 35b of the sheet member 35 are opened. Thereby, the sheet member 31 and the sheet member 35 are opened, and the optical disk 20 can be taken out from the disk holder 30.

  Next, the recording / reproducing unit 50 is slightly lowered, the circular plate 20c of the chucked optical disk 20 is pulled out from the opening 35a of the sheet member 35, and then the recording / reproducing unit 50 is moved in the + X direction. As shown in (C), the spindle 52 is moved along the slot 31 a, and the optical disk 20 chucked by the spindle 52 is taken out from the disk holder 30.

  Next, the recording / reproducing unit 50 holding the optical disk 20 taken out from the disk holder 30 is moved below the stabilizing member 40 as shown in FIG. 8 as an example. From this state, when the optical disk 20 is rotated by the recording / reproducing unit 50, the optical disk 20 is generated by a restoring force that tends to become horizontal due to the centrifugal force generated by the rotation, and the action of the rotation and the surface shape. A repulsive force is generated by a pressure change based on the difference in air flow. At this time, the stabilizing member 40 applies an aerodynamic force to the optical disc 20 and balances the restoring force and the repulsive force generated in the optical disc 20, so that the so-called surface wobbling of the optical disc 20 (the rotational axis of the optical disc 20 is rotated). (Directional deflection) is reduced. When the rotation of the optical disk 20 is stabilized, the recording / reproducing unit 50 records information on the optical disk 20 by irradiating the region 20b (recording layer) with laser light while moving the pickup 54 in the Y-axis direction. Or read out.

  After the recording or reading of information with respect to the optical disk 20 is completed, the optical disk 20 held in the recording / reproducing unit 50 is stored in the disk holder 30 in the reverse order of the above-described procedure, and then the internal space of the casing 11 is stored. Can be accommodated.

  As described above, in the present embodiment, the disc holder 30 for storing the optical disc 20 is accommodated in the internal space of the casing 11 in a curved state. As a result, the optical disk 20 is stably sandwiched between the pair of curved sheet members 31 and 35, so that the optical disk 20 does not move inside the disk holder 30. For example, the optical disk 20 and the disk holder Thus, it is possible to avoid the problem that information recorded on the optical disc 20 is lost.

  Further, when the disc holder 30 is pulled out from the internal space of the casing 11, the disc holder 30 is maintained in a curved state in the same manner as when accommodated. Accordingly, the optical disk 20 is stably held by the pair of curved sheet members 31 and 35 even when being transported from the internal space of the casing 11 to the external space. It is possible to avoid moving relative to 30. Thereby, for example, it is possible to quickly and accurately position the optical disc 20 and the recording / reproducing unit 50 and to avoid mischucking of the optical disc 20.

  In the above-described embodiment, the case where the optical disk 20 is stored in the horizontal (horizontal) state in the disk cartridge 10 has been described. However, the present invention is not limited thereto, and the optical disk 20 may be stored vertically. Also in this case, since the disc holder 30 is bent, the optical disc 20 is stably held between the pair of sheet members 31 and 35 of the disc holder 30, so that the optical disc 20 is held in the disc holder 30 during the conveyance. A relative movement is avoided.

  In the above embodiment, the optical disc 20 is curved so as to be convex downward, but the present invention is not limited thereto, and the optical disc 20 may be curved so as to be convex upward.

  Further, the sliding between the optical disk 20 and the disk holder 30 can be achieved by devising the material of the parts of the sheet members 31 and 35 of the disk holder 30 that are in contact with the optical disk 20, performing a lubrication process, or attaching a non-woven fabric. The problem caused by can be avoided.

  For example, the disk holder 30 can be stored in the casing 11 from the state shown in FIG. 9A to the state where each disk holder 30 is flat as shown in FIG. 9B. It is. Further, a mechanism that can change the inclination angles of the guides 12A to 12D and 13A to 13D of the disk cartridge 10 is provided. For example, in the storage state, the disk holder 30 is leveled as shown in FIG. When the optical disk 20 is loaded, the disk holder 30 may be curved as shown in FIG. 9A.

  In the present embodiment, an overhang portion 35 e is formed at the −Y side end portion of the sheet member 35 of the disc holder 30. Thereby, when the disk holder 30 is pulled out from the casing 11, the corner portion on the −Y side of the sheet member 35 can be prevented from being caught near the opening 11 a of the casing 11.

  In the above-described embodiment, the case where the optical disk 20 is directly transferred from the disk holder 30 to the recording / reproducing unit 50 has been described. However, the present invention is not limited to this. You may convey using a conveying apparatus, such as. In this case, for example, as shown in FIG. 10 (A), a holding arm 201 having a holding portion 201 that is curved so that the upper surface is convex upward is used, as shown in FIG. 10 (B). The circular plate 20c of the optical disk 20 is magnetically attracted by the holding surface of the unit 201, for example, so that the optical disk 20 is bent so that the generatrix is parallel to the Y axis.

  Thereby, the apparent rigidity of the optical disc 20 can be increased, and flapping of the optical disc 20 being conveyed can be reduced. In this transport, fluttering of the disk being transported can be further reduced by setting the transport direction to a direction parallel to the generatrix. Note that the holding surface of the holding unit 201 is desirably limited to a specific range of the inner peripheral portion excluding the region 20b of the optical disc 20. With this configuration, the optical disk can be held regardless of the front and back surfaces of the disk. (If the holding surface covers the information recording area, the recording surface may be damaged if the recording surface side of the disc is the holding surface side.)

  In addition, the disk holder 30 can be completely removed from the casing 11 and placed on a tray 210 having a curved holding surface as shown in FIG. Also in this case, since the optical disc 20 is stably held by the pair of curved sheet members 31 and 35, it is possible to avoid the optical disc 20 from moving inside the disc holder 30.

  As shown in FIG. 12, the disc holder 30 is placed on the stabilization surface of the stabilization member 40 provided in the recording / reproducing unit, so that any one of the sheet members 31, 35 of the disc holder 30 is placed. It can be used as a stabilizing member for stably rotating the optical disk 20.

  Moreover, although the case where the three disk holders 30 were accommodated in the casing 11 was demonstrated in the said embodiment, not only this but three or more or two or less disk holders 30 may be accommodated in the casing 11. It may be.

  Moreover, in the said embodiment, although the disk holder 30 accommodated in the casing 11 was curved by guide 12A-12D, 13A-13D, it is not restricted to this, For example, the casing 11 is comprised with a flexible raw material, FIG. As shown in FIG. 13, the disc holder 30 may be curved together with the casing 11.

  In the above embodiment, the flexible optical disk 20 has been described. However, the present invention is not limited to this, and the present invention is also suitable for a flexible disk such as a magnetic disk or a magneto-optical disk. It is.

  As described above, the disk transport method of the present invention is suitable for transporting a flexible disk. The disc cartridge of the present invention is suitable for accommodating a flexible disc. The information recording / reproducing apparatus of the present invention is suitable for reproducing and recording information on a flexible disk.

1 is a perspective view of a disk cartridge 10 and a recording / reproducing unit 50 included in a disk device 100 according to a first embodiment of the present invention. 3 is a plan view of the optical disc 20. FIG. 3 is a view showing a disk holder 30 accommodated in a casing 11 of the disk cartridge 10. FIG. 4A is a perspective view of the disc holder 30, and FIG. 4B is an exploded perspective view of the disc holder 30. FIG. It is a figure which shows the positioning member 33 provided in the sheet | seat member 31. FIG. 3 is a cross-sectional view showing an optical disc 20 accommodated in a disc holder 30. FIG. FIG. 7A to FIG. 7C are diagrams for explaining a procedure for taking out the optical disc 20 from the disc holder 30. FIG. 4 is a diagram for explaining information recording and reproduction operations with respect to the optical disc 20. FIG. 9A and FIG. 9B are views for explaining a modified example (No. 1) of the casing 11. FIG. 10A is a perspective view showing a schematic configuration of the transport arm 200, and FIG. 10B is a diagram for explaining a method of holding the optical disk 20 by the transport arm 20. FIG. 10 is a diagram showing a modification of the method for transporting the disc holder 30. It is a figure which shows the example in which the disc holder 30 is used as a stabilization member. FIG. 10 is a view showing a second modification of the disc cartridge 10.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Disc cartridge, 11 ... Casing, 11a ... Opening part, 12A-12D, 13A-13D ... Guide, 20 ... Optical disk, 20a ... Sheet, 20b ... Area | region (recording layer), 20c ... Circular plate, 30 ... Disc holder, 31, 35 ... Sheet member, 31a ... Slot, 32 ... Locking member, 33 ... Positioning member, 35a ... Opening, 35b ... Notch part, 35c ... Stopper part, 35d ... Tag, 35e ... Overhang part, 40 ... Stabilization member 50 ... Recording / reproducing unit 52 ... Spindle 54 ... Pickup 100 ... Disk device

Claims (10)

A disk conveying method for conveying a flexible disk,
Sandwiching the disk between a pair of flexible sheets;
Bending the set of sheets sandwiching the disk together with the disk. A disk conveying method for conveying a flexible disk,
A holding step of holding the disc in a curved shape;
A disc transport method comprising: transporting the disc held in a curved shape.   3. The disk conveying method according to claim 2, wherein in the holding step, the area other than the recording area of the disk is held. A disk cartridge for accommodating a flexible disk,
A disc cartridge that holds the disc between a set of flexible sheets and accommodates the disc and the set of sheets in a curved state. A disc holder comprising the set of sheets sandwiching the disc;
The disc cartridge according to claim 4, further comprising: a casing that accommodates the disc holder in which the disc is stored while being sandwiched between the pair of sheets so that the disc holder is bent together with the disc. A disk cartridge for accommodating a flexible disk,
A disc holder comprising a set of sheets sandwiching the disc;
A mechanism for controlling the curved state of the disc holder stored in a state where the disc is sandwiched between the set of sheets;
A disk cartridge comprising: a casing for accommodating the disk holder in a removable manner.   7. The disk cartridge according to claim 5, wherein the casing accommodates a plurality of the disk holders. An information recording / reproducing apparatus that performs at least one of information recording and reproduction on a flexible disk,
A disk cartridge according to any one of claims 4 to 7;
A processing device for performing at least one of recording and reproduction of information on the disc;
An information recording / reproducing apparatus comprising: a transport device that transports the disk between the disk cartridge and the processing device.   The information recording / reproducing apparatus according to claim 8, wherein the transport device has a holding surface that holds the disk in a curved shape.   The information recording / reproducing apparatus according to claim 9, wherein the holding surface holds a portion other than a recording area of the disc.

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