JP2012022745A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device with which mechanical stuck and disk falling are avoided and a disk can be ejected even when a clamping error of the disk occurs.SOLUTION: The disk device comprises: a driving unit which lifts and lowers a turn table, rotationally drives a disk at a first height position and lifts the disk to a second height position when the disk is ejected; a transfer unit which holds the disk, carries in at the second height position on the turn table and guides the disk to a disk insertion opening when the disk is ejected; clamp mechanism for clamping a periphery of a disk hole to a turn table surface when the disk is rotationally driven; a guide member for holding a peripheral part of the disk when the disk is lifted to the second height position; and a control part which holds the disk by the guide member and the transfer unit at a position where the turn table is lowered and executes recovery processing so as to release the clamp when a clamping error occurs.

Description

  The present invention relates to a disk device capable of reproducing and recording a disk such as a CD (Compact Disk) and a DVD (Digital Versatile disk), and more particularly to a disk device that copes with a disk centering error.

  2. Description of the Related Art Conventionally, a changer-type disk device that can store a plurality of disks loads (loads) a disk inserted from a disk insertion slot into a housing by a transfer unit, and loads the loaded disk to the thickness of the disk. The trays are stacked in the direction. A disk selected from the plurality of trays is rotationally driven by a drive unit, and data recorded on the disk is read or recorded on the disk by an optical head. Patent Document 1 describes such a storage-type disk device.

  In the conventional disk device, the disk loaded from the disk insertion port is held by a holding mechanism in the housing, and then the disk drive unit is raised to place the rotation center of the turntable into the center hole of the disk. Then, the holding by the holding mechanism is released, the drive unit is lowered, the disk is placed on the turntable, and the reproduction state is entered. The disk placed on the turntable is reproduced by rotating the spindle motor in a clamped state around the center hole by a disk clamper.

  After the reproduction is finished, the drive unit is raised once to hold the disc by the guide member, and the periphery of the disc is held by the holding mechanism. After that, the clamp is released, the drive unit is lowered, the turntable is separated from the disk, and the disk is ejected.

  However, if a centering error occurs when the disc is inserted, the center hole of the disc and the position of the turntable are shifted, and the disc cannot be clamped and cannot be reproduced. When a clamping error occurs, the disk is ejected and reinserted. However, depending on circumstances, the disk may fall into the mechanical stack or the disk may fall and be unable to be ejected.

  Patent Document 2 discloses a disk device that determines whether or not a disk has been transported normally and prevents loading errors, holding errors, and disk dropping. Patent Document 3 discloses an optical disc apparatus that determines the magnitude of the focus drive voltage when the optical disc is held in an inclined state, and re-holds the disc.

JP 2007-87507 A JP 2007-207389 A Japanese Patent Laid-Open No. 2004-280987

  In the conventional disk device, if a centering error occurs when the disk is inserted, the disk is ejected and then reinserted. However, the disk may fall into the mechanical stack or the disk may fall and be unable to be ejected.

  In view of the above circumstances, an object of the present invention is to provide a disk device that can eject a disk while avoiding a mechanical stack and a disk drop even when a centering error (clamping error) occurs.

  A disk device according to an embodiment of the present invention includes a turntable on which a disk is placed, and the turntable is moved up and down to rotationally drive the disk at a first height position when the disk is ejected. A drive unit for raising the disk to a second height position, and holding the disk inserted into the disk insertion slot, carrying it to the second height position on the turntable, and holding the disk when ejected A transfer unit that leads from above the turntable to the disc insertion slot, a clamp mechanism that holds the periphery of the center hole of the disc to the turntable surface when the disc is driven to rotate, and the disc is the second When the disk is raised to a height position, the guide member that holds the peripheral edge of the disk and the disk is moved forward by a clamping error of the clamping mechanism. When the turntable is at a position higher than the turntable surface, the recovery process is performed so that the disk is held by the guide member and the transfer unit while the turntable is lowered and the turntable is lifted to release the clamp. And a control unit.

  In the disk device according to the embodiment of the present invention, recovery processing can be performed when a disk clamping error occurs, and the disk can be ejected while avoiding a mechanical stack or disk drop.

FIG. 3 is a plan view showing a drive unit and a disk storage portion of the disk device according to the embodiment of the present invention. The top view explaining a motion of a drive unit. The top view which shows the structure of a disk storage part and a transfer unit. The top view which shows the loading operation | movement of the disc to a disc storage part. The top view which shows the holding | maintenance operation | movement of the disc in a disc accommodating part. The top view which shows the time of a drive of a disk. The perspective view which shows the structure of the transfer roller of a transfer unit. The side view which shows the clamp mechanism of a disk. The side view which shows the state which clamped the disk with the clamp mechanism. Explanatory drawing which expands and shows the state which clamped the disk. The side view which shows the raising / lowering operation | movement of a drive unit, and the slide operation | movement of a guide member. Explanatory drawing which shows operation | movement of the transfer roller and sensor of a transfer unit. The perspective view which shows the specific structure of a disk storage part. The perspective view which shows the structure of the selection axis | shaft of a disk storage part. The perspective view which shows the structure of the holding member attached to the selection axis | shaft. The perspective view which looked at the disc storage part from the bottom side. 1 is a block diagram showing a control system of a disk device according to an embodiment. The top view which shows the disk from which the outer peripheral part was missing. The side view which shows the disc which carried out the clamp mistake. The side view which shows operation | movement of the guide member at the time of a clamp mistake. The side view which shows operation | movement of the transfer unit at the time of a clamp mistake. The flowchart which shows the discrimination | determination operation | movement of a clamping mistake. Continuing flowchart showing clamping error discrimination operation The flowchart which shows the recovery process at the time of a clamp mistake. The side view which shows the recovery operation at the time of a clamp mistake. Explanatory drawing explaining a focus error signal. The flowchart which shows the operation | movement of the focus search at the time of a clamp mistake. 7 is a flowchart showing the operation following the focus search.

  A disk device according to an embodiment will be described below with reference to the drawings.

  First, the structure of the disk device 100 according to an embodiment of the present invention will be described. The basic structure of the disk device 100 is the same as that described in Patent Document 1.

 FIG. 1 and FIG. 2 are plan views showing the internal structure of the storage-type disk device 100, and mainly show the drive unit 10 and the disk storage portion 30 configured in the housing 1. Note that a disk insertion slot 2 is provided on the right side of the figure, and the disk is inserted into the disk device 100 from the direction of arrow A in the figure and ejected in the direction of arrow B.

 The drive unit 10 can rotate between a retracted position shown in FIG. 1 and an intervention position shown in FIG. 2 with one end as a fulcrum, and is provided with a turntable 11 at the other end. When the drive unit 10 is in the intervention position, the drive unit 10 selects the disk stored in the disk storage unit 30 and places it on the turntable 11, and drives the disk to perform reproduction or recording. The disk storage unit 30 includes a stacked tray 31 for storing a plurality of disks. The detailed configuration will be described later.

  The drive unit 10 is supported by a unit support base 13 as shown in FIG. The inner edge 13 a of the support base 13 has an arc shape, and the inner edge 13 a is located slightly away from the outer peripheral edge of the disk supported by the disk storage portion 30. The drive unit 10 has an elongated drive base 12. A support shaft 14 protrudes upward on the back side of the unit support base 13, and the drive base 12 is supported by the support shaft 14. The drive unit 10 is supported by the support shaft 14 in the direction of arrow C (FIG. 2). To turn. The drive unit 10 is rotated by the movement of the drive slider 15, and the drive slider 15 is moved by the rotation of the first motor M1 (not shown).

  As shown in FIG. 2, when the drive unit 10 rotates to the intervention position, the turntable 11 moves to the disk storage unit 30. In this intervention position, the rotation center of the turntable 11 is located below the center hole of the disk supported by the tray 31.

  A spindle motor is attached to the rotating end of the drive base 12, and the turntable 11 is fixed to a motor shaft 11a of the spindle motor. The turntable 11 has a convex portion 11b that enters the center hole of the disk D, and a flange portion 11c that extends from the convex portion 11b.

  A clamp mechanism (FIGS. 8 and 9) is mounted in the turntable 11. The clamp mechanism has clamp claws 61 (FIG. 9) protruding radially from the convex portion 11b. When the clamp claw 61 is retracted into the central convex portion 11b, the non-clamp mode is set. When the clamp claw 61 protrudes, the peripheral edge of the center hole Da of the disk D is sandwiched between the clamp claw 61 and the flange part 11c, and the disk D is clamped on the upper surface of the turntable 11 to enter the clamp mode.

  The drive base 12 of the drive unit 10 is equipped with a clamp switching member 64 for operating the clamp claw 61. After the drive unit 10 moves to the intervention position, the clamp claw 61 is not moved by the movement of the drive slider 15. The clamp mode is switched to the clamp mode.

  Further, an optical head 16 is mounted on the drive base 12 adjacent to the turntable 11. An objective lens 17 is provided on the upper surface of the optical head 16, and a thread mechanism (not shown) for moving the optical head 16 in the radial direction of the disk D is provided. The objective lens 17 can be moved in the radial direction of the disk D clamped to the turntable 11 by the thread mechanism.

  Also, dampers 18 are fixed at three locations on the bottom surface of the housing 1. That is, support shafts 19 are fixed downward at three locations on the bottom surface of the support base 13, and each support shaft 19 is supported by each damper 18. 1 can be elastically supported on the bottom surface.

    FIG. 3 is a plan view showing the internal structure of the storage disk device 100, and mainly shows the configuration of the disk storage unit 30 and the transfer unit 20 that transfers the disk D to the disk storage unit 30. FIGS. 4 and 5 are plan views showing the loading operation of the disk D into the disk storage section 30, and FIG. 6 is a plan view showing when the disk D is driven.

  The transfer unit 20 has an elongated unit frame 21 extending in parallel with the disc insertion slot 2, and a roller shaft 22 is provided in parallel in the unit frame 21, and both ends of the roller shaft 22 are rotatable to the side surface of the unit frame 21. It is supported by.

The outer periphery of the roller shaft 22 is provided with a first transfer roller 231 and a second transfer roller 232 made of a material having a high friction coefficient such as natural rubber, and the transfer rollers 231 and 232 are spaced apart in the axial direction. Arranged to be free. The transfer unit 20 rotates (revolves) around the fulcrum shaft 53 between the standby position in FIG. 3 and the transfer position shown in FIG. 4. FIG. 7 shows the first transfer roller 231 in the transfer unit 20. It is a perspective view which shows the drive mechanism. The transfer roller 231 faces the sliding member 24 provided in the unit frame 21, and sandwiches the disk D between the transfer roller 231 and the sliding member 24 (and the transfer roller 232 and the sliding member 24). . Therefore, the disk D can be carried into the housing 1 by the rotation of the transfer rollers 231 and 232 and the disk D can be discharged from the housing 1 by rotating the transfer rollers 231 and 232 in the reverse direction.

  One end of the roller shaft 22 protrudes from the side surface 21 a of the unit frame 21, and the gear 25 is fixed to the protruding roller shaft 22. A gear 26 that meshes with the gear 25 is provided on the side surface 21a. Further, on the lower surface of the unit frame 21, a support piece 21b is integrally formed protruding downward, a shaft 27 is fixed to the support piece 21b, and a gear in which a gear 28 and a worm wheel 29 are integrated with the shaft 27 is rotated. Supports freely.

  Further, a fulcrum shaft 53 of the gear 51 and the worm gear 52 is rotatably inserted into the bearing portion 21c provided in the unit frame 21 so that the worm wheel 29 and the worm gear 52 are engaged with each other. The gear 51 and the worm gear 52 are rotated by a third motor M3 (see FIG. 1), and the rotational force of the worm wheel 29 is transmitted to the gear 25 via the gear 28 and the gear 26 to drive the roller shaft 22. The transfer rollers 231 and 232 are rotated.

  As shown in FIG. 7, the gear 51 below the fulcrum shaft 53 fixed to the bottom surface of the housing 1 meshes with an intermediate gear 54 (FIG. 1) provided on the bottom surface of the housing 1. It is driven by a motor M3.

  The transfer unit 20 is slightly separated from the outer peripheral edge of the disk D supported by the tray 31 of the disk storage unit 30 in the standby position of FIG. On the other hand, as shown in FIG. 4, when the transfer unit 20 is rotated to the transfer position about the fulcrum shaft 53, a virtual line (conveyance center line Ob) perpendicular to the axis of the transfer rollers 231 and 232 is The direction is 30.

  When the transfer unit 20 is in the transfer position of FIG. 4, the disk D carried in by the transfer rollers 231 and 232 is supplied to the tray 31 of the disk storage unit 30, and then, as shown in FIG. Returns to the standby position.

  FIG. 5 shows a state where the disk D is held on the tray 31. The disk D supplied to the tray 31 is held by the tray 31 and holding members 46, 47, 48. The operation of the holding members 46, 47, 48 will be described in detail later. FIG. 6 shows a state when the disk D is reproduced. The disk D is released from being held by the holding members 46, 47, and 48 and is supported by the turntable 11.

  8 and 9 are side views showing the clamping mechanism 60 of the disk D. FIG. As shown in FIG. 8, the drive unit 10 including the turntable 11 has a drive base 12 (see FIGS. 1 and 2), and a spindle motor SM is fixed to the upper surface of the rotation end of the drive base 12. The turntable 11 is fixed to the motor shaft of the spindle motor SM. The turntable 11 is integrally formed with a disk-shaped flange 11c on which the lower surface of the disk D is placed and a convex part 11b that protrudes upward from the center of the flange 11c and enters the center hole of the disk D. . The lower surface of the flange 11c has a gear 11d formed at an equal pitch in the circumferential direction.

  A plurality of clamp claws 61 are provided in the convex portion 11 b of the turntable 11. As shown in FIG. 8, the clamp claw 61 is movable between a non-clamping position retracted into the convex portion 11b and a clamp position protruding outside the convex portion 11b as shown in FIG. . The clamp pawl 61 is biased by a spring toward the clamp position. A switching gear 62 is provided under the flange 11c. The switching gear 62 is rotatable independently of the turntable 11 with the motor shaft as a fulcrum. A lock plate spring 63 is fixed to the drive base 12, and the tip of the lock plate spring 63 can be hooked on the gear 62.

  As shown in FIGS. 1 and 2, the drive unit 10 is provided with a clamp switching member 64 on the side of the drive base 12. The clamp switching member 64 is slidable along the side of the drive base 12, and a driving tooth 65 (FIGS. 1 and 2) directed to the switching gear 62 is provided at the tip of the clamp switching member 64. ing.

  As shown in FIG. 1, when the clamp switching member 64 is moving to the rotation fulcrum side (support shaft 14 side) of the drive base 12, the drive teeth 65 of the clamp switching member 64 mesh with the switching gear 62, and The tip of the lock plate spring 63 is engaged with a gear 11d formed on the flange 11c. At this time, as shown in FIG. 8, the switching gear 62 is restrained by the drive teeth 65, the turntable 11 is restrained by the lock plate spring 63, and the clamp pawl 61 is retracted into the convex portion 11 b to be in an unclamped state.

  As indicated by the broken line in FIG. 2, when the drive unit 10 rotates to the intervention position and the clamp switching member 64 moves to the rotation end side of the drive base 12, the drive teeth 65 are disengaged from the switching gear 62. At this time, as shown in FIG. 9, the tip of the clamp switching member 64 rides on the lock plate spring 63, and the lock plate spring 63 is disengaged from the gear 11d of the flange 11c. As a result, the turntable 11 and the switching gear 62 are in a free state, and the clamp claw 61 protrudes around the convex portion 11b by the force of the spring and is in a clamped state. At this time, the periphery of the center hole Da of the disk D is sandwiched between the flange 11 c and the plurality of clamp claws 61, and the disk D is clamped to the turntable 11. Therefore, when the disk D is reproduced (or recorded), the disk D is clamped to the surface of the turntable 11 by the clamp claws 61 as shown in an enlarged view in FIG.

  Further, as shown in FIG. 3, a guide member 70 is provided in the housing 1 at a position outside the outer peripheral edge of the disk D. The guide member 70 rotates to hold the outer periphery of the disk D when the drive unit 10 moves to the intervention position, and prevents the turn table 11 and the like being moved from hitting the disk D. Further, when the disk D is loaded or ejected by the transfer unit 20, the outer periphery of the disk D is held and supported by the guide member 70. For convenience, the guide member 70 is omitted in FIG.

  Further, when the drive of the disk D is finished and the disk D is ejected, the drive unit 10 is raised, but when the drive unit 10 is in the raised position, the guide member 70 plays a role of holding the disk D. . When the disk D is held by the guide member 70, the drive unit 10 is lowered and the disk D is separated from the turntable 11.

  FIG. 11 is an explanatory view showing the raising and lowering operation of the drive unit 10 and the holding operation by the guide member 70. FIG. 11A shows the time when the drive unit 10 (turn table 11) is lowered and the disk D is in the reproduction state. . When the reproduction of the disk D is completed, the apparatus waits at a lowered position and waits for an ejection operation. The position of the drive unit 10 at this time is called a standby position.

  FIG. 11B shows a state where the drive unit 10 is raised by the eject operation. When the disk D reaches the raised position, the guide member 70 slides to a position for holding the outer periphery of the disk D, and holds (holds) the outer periphery of the disk D as shown in FIG. The guide member 70 includes a lower guide 71 and an upper guide 72, and the disk D enters between the lower guide 71 and the upper guide 72.

  When the disk D is held by the guide member 70, the transfer roller 20 rotates to the position shown in FIG. 4, and the disk D is held by the transfer roller 231 (232). The drive unit 10 is lowered while the disk D is held by the guide member 70 and the transfer rollers 231, 232, and the turntable 11 is extracted from the center hole of the disk D.

  As shown in FIG. 3, sensors S1 and S2 are arranged on the unit frame 21 that holds the transfer rollers 231 and 232 of the transfer roller 20, and the disk D is moved by the transfer roller 231 (or the transfer roller 232). Whether it is held or not is detected. FIG. 12 is an enlarged side view showing the sensor S1 (S2). Taking the sensor S1 as an example, the sensor S1 is a photosensor including a light emitting element S11 and a light receiving element S12. When there is no disk D in the unit frame 21, light is emitted from the light emitting element S11 to the light receiving element S12. However, when the disk D is in the unit frame 21, the light from the light emitting element S11 is blocked by the disk D. Therefore, it is detected whether the disk D is held by the transfer roller 231 (232). it can.

  Next, the configuration of the disk storage unit 30 will be described. As shown in FIG. 13, the disk storage unit 30 is provided in the housing 3 and has a plurality of fan-shaped disk supports (tray) 31. The housing 3 is in the housing 1. Each tray 31 is supported by shafts (selection shafts) 32a, 32b, and 32c at three locations on the outer edge. Reference numeral 3 a denotes a ceiling portion of the housing 3.

 FIG. 14 is an enlarged view showing one of the selection shafts 32 a, 32 b, and 32 c, and FIG. 15 is a view showing a state in which the disk D is supported by one of the trays 31. In the following description, the selection shafts 32a, 32b, and 32c may be collectively referred to as the selection shaft 32.

 As shown in FIG. 14, a spiral groove 33 is formed on the outer periphery of the selection shaft 32. The grooves 33 have dense pitches 33a and 33b above and below the selection shaft 32, and form grooves of at least 5 rounds (5 pitches) or more. Further, in the intermediate portion of the selection shaft 32, the grooves 33 have a sparse pitch 33c, and the grooves 33 are formed by one pitch between the upper dense pitch and the lower dense pitch. The trays 31 are formed of, for example, a thin metal plate, and are provided in a stack of six sheets in the vertical direction, each having a fan shape.

 As shown in FIG. 15, a bearing 34 is fixed to the tray 31, and the bearing 34 is inserted into the outer periphery of the selection shafts 32 a 32 b and 32 c, and a locking portion (at a fulcrum 34 a in FIG. Are formed so as to protrude integrally, and this locking portion is slidably locked in the groove 33 of each selection shaft 32.

  The locking portions 34a of the bearings 34 of the six trays 31 are locked to the pitches of the grooves 33. When the selection shaft 32 rotates counterclockwise, the tray 31 moves along the selection shaft 32. When the selection shaft 32 is rotated downward one by one and the selection shaft 32 rotates clockwise, the tray 31 is fed upward along the selection shaft 32 one by one and moves up and down like an elevator. Therefore, the selection shaft 32 and the drive unit that rotates the selection shaft 32 constitute an elevator mechanism.

  Thus, each tray 31 is raised or lowered by the rotation of the selection shaft 32, and the tray 31 located in the sparse pitch portion 33c in the center portion of the selection shaft 32 (the tray 31 at the selection position α) is adjacent to the lower tray 31. The drive unit 10 can be made to enter the space greatly away from it, and reproduction and recording are possible.

  FIG. 16 is a perspective view showing the structure of the disc storage unit 30, and FIG. 16A is a perspective view showing the overall structure, and is viewed from the state of FIG. 13 with the top and bottom reversed and the ceiling 3 a facing down. FIG. For ease of explanation, only one tray 31 is shown.

  As shown in FIG. 16A, a small gear 35 is provided on the upper ends (ceiling side) of the three selection shafts 32a, 32b, 32c, and a large-diameter ring gear 36 is provided on the inner surface of the ceiling portion 3a. It is provided so that it can rotate freely. The ring-shaped gear 36 meshes with the small gear 35 of the selection shaft 32, and all the small gears 35 are rotated in synchronization with the rotation of the ring-shaped gear 36, and the three selection shafts 32a, 32b, 32c are synchronized. Then rotate.

  A rotating shaft 37 is rotatably supported on the inner surface of the ceiling portion 3a. A transmission gear 38 is fixed to the lower end of the rotating shaft 37, and a gear 39 is fixed to the upper end of the rotating shaft 37, and the gear 38 meshes with the ring-shaped gear 36. When the second motor M2 is started, the power is transmitted to the gear 39, and the ring gear 36 is driven. That is, when the transfer unit 20 is stopped at the standby position (FIG. 3), the gear 39 is driven by the second motor M2, and the ring-shaped gear 36 is rotated so that the tray 31 is selected.

  Further, as shown in an enlarged view in FIG. 16B, a rotation detector 40 is provided on the inner surface of the ceiling portion 8a. The rotation detection unit 40 has a support shaft 41 fixed to the ceiling portion 8a. The support shaft 41 is integrally formed with a gear 42 and a gear 43 with a part missing, and the gear 42 is a ring-shaped gear. 36 is engaged.

  The gear 43 is formed with a notch 43 a, and a pair of optical sensors 44 and 45 are arranged so as to sandwich the gear 43. Each of the optical sensors 44 and 45 includes a light emitting element that faces the upper surface of the gear 43 and a light receiving element that faces the lower surface of the gear 43.

  When the notch 43a of the gear 43 faces the optical sensors 44 and 45, the light emitted from the light emitting element is received by the light receiving element, and the detection output is turned on. Further, when the light emitted from the light emitting element is blocked by the gear 43, the detection output is turned off.

  Therefore, in the rotation detection unit 40, when the ring-shaped gear 36 rotates and each selection shaft 32 rotates and one of the trays 31 reaches the selection position α, the optical sensors 44 and 45 are simultaneously turned ON, When the rotation member 42 makes one rotation and the optical sensors 44 and 45 are turned on next time, it is detected that the next tray 31 has reached the selection position α. In addition, it is possible to recognize the rotation direction of the ring gear 36, that is, whether the tray 31 is moving downward or upward, depending on which of the optical sensors 44 and 45 is turned on or off first.

  Further, when both the optical sensors 44 and 45 are simultaneously turned ON, the tray 31 can be stopped at the selected position α by stopping the second motor M3. In addition, by counting the number of times both the optical sensors 44 and 45 are turned on, it is possible to recognize which of the six trays 31 has reached the selected position α.

  Further, as shown in FIG. 16A, the tray 31 is provided with three holding members 46, 47, and 48. However, in FIGS. 3 and 4 to 6, the holding members 46, 47, and 48 are illustrated through the tray 31 for easy understanding.

  The holding member 46 is rotatably supported on the outer periphery of the bearing 34 on the selection shaft 32a. Similarly, the holding member 47 is on the outer periphery of the bearing 34 on the selection shaft 32b, and the holding member 48 is on the selection shaft 32c. Each of the bearings 34 is rotatably supported on the outer periphery. As shown in FIG. 3, a tension coil spring 49 is hung between each holding member 46, 47, 48 and the tray 31.

  The structure of the holding member 48 is also similar to that of the holding member 47, and has a holding claw 48b at the tip of the arm as shown in FIG. The holding member 48 integrally has a detection part 48h extending on the opposite side of the holding claw 48b, and a sensor 50 for detecting that the disk D is held is provided in the proximity of the detection part 48h. The sensor 50 is, for example, an optical sensor in which a light emitting element and a light receiving element are arranged to face each other. The structure of the holding member 46 is similar to the holding member 47, and has a holding claw 46b at the tip of the arm portion. Thus, each holding member 46, 47, 48 constitutes a holding mechanism that holds the disk D with the tray 31.

  Hereinafter, the operation of the disk device 100 will be described. First, when loading the disk D into the disk device 100, the disk D is inserted from the insertion slot 2 as shown in FIG. 3, and when the insertion of the disk D is detected, the third motor M3 (FIG. 2). 1) is started, the transfer rollers 231 and 232 of the transfer unit 20 in the standby position are rotated in the loading direction, and the disk D is sandwiched between the transfer rollers 231 and 232 and the unit frame 21 (FIG. 7). It is carried in. At this time, the holding member 46 is rotated in the γ1 direction by the drive member 56 so as not to disturb the loading of the disk D.

  When the disk D is further loaded, the second motor M2 is restarted, and the transfer unit 20 rotates around the fulcrum shaft 53 to the transfer position shown in FIG. The transfer rollers 231 and 232 continue to rotate while rotating to the transfer position, and the disk D is moved from the disk insertion port 2 to the disk storage portion by the rotation (revolution) of the transfer unit 20 and the rotation of the transfer rollers 231 and 232. It is carried into 30 holding positions. FIG. 5 shows a state where the disk D is loaded and held in the disk storage unit 30.

  When the disk D is inserted, the holding member 46 is rotated in the γ1 direction as shown in FIG. 3. However, as the disk D is inserted, the drive by the drive member 56 is released, and the disk 49 is pulled by the spring 49. To turn. The center of the disk D is indicated by D0 and the center hole is indicated by Da.

  The holding members 47 and 48 are also rotated in the γ4 direction by the spring 49. Therefore, the disk D fed into the tray 31 first hits the holding member 46 as shown in FIG. 4, and rotates the holding member 46 in the direction of γ1 against the urging force of the spring 49.

  Further, the transferred disk D hits the holding members 47 and 48. As a result, as shown in FIG. 5, the disk D enters between the lower surface of the tray 31 and the holding claws 46 b, 47 b, 48 b, and the holding members 47, 48 resist the urging force of the spring 49 in the γ3 direction. Rotate. Then, the outer peripheral edge of the disk D is positioned and held by the holding members 47 and 48.

  Further, the sensor 50 detects that the disk D is held on the tray 31. That is, as shown in FIG. 5, the detection unit 48h located between the light emitting element and the light receiving element of the sensor 50 is removed, so that the detection output is turned on.

  After the disk D is stored, the transfer unit 20 is rotated from the transfer position to the standby position by the second motor M2. When the transfer unit 20 returns to the standby position, the insertion port 2 is closed by the shutter. At this time, the disk D is held between the lower surface of the tray 31 and the holding claws 47b, 48b, 48c of the holding members 46, 47, 48.

  When driving the disk D held on the tray 31, as shown in FIG. 6, the central convex portion 11 b (see FIG. 1) of the turntable 11 provided in the drive unit 10 at the intervention position is the central hole Da of the disk D. Enter and clamp disc D. At this time, the holding members 47 and 48 are further rotated in the γ3 direction by the drive member 55, and the holding claws 47 b and 48 b are separated outward from the outer peripheral edge of the disk D. The holding member 46 is further rotated in the γ1 direction by the driving member 56, and the holding claw 46b is separated from the outer peripheral edge of the disk D to the outside.

  Thereafter, the drive unit 10 is lowered to the bottom side than during the clamping operation, and the disk D is separated from the lower surface of the tray 31. Then, the disk D (see FIGS. 9 and 10) clamped by the clamp claw 61 is driven to rotate, and a signal recorded on the disk D is read by the optical head 16 or a signal is recorded on the disk D. At this time, the unit support base 13 is elastically supported by the damper 18.

  On the other hand, when the disc D that has been reproduced or recorded is ejected, the spindle motor stops and the rotation of the turntable 11 stops. Further, as shown in FIG. 11B, the support base 13 is lifted, and the disk D is pressed against the lower surface of the tray 31 at the selected position α. At this time, as shown in FIG. 11C, the disk D is held by the guide member 70, and the transfer unit 20 is rotated to the position shown in FIG. Disc D is inserted. Further, as shown in FIG. 5, the holding member 46 is rotated in the γ2 direction, the holding members 47 and 48 are rotated in the γ4 direction, and the disk D is moved to the lower surface of the tray 31 and the holding claws 46b, 47b and 48b. Hold on.

  Then, the unit support base 13 and the drive unit 10 are lowered toward the bottom surface, the disc D is clamped by the clamp claws 61 of the turntable 11, and the disc D comes out of the turntable 11. Thereafter, the transfer rollers 231 and 232 of the transfer unit 20 are rotated in the unloading direction by the third motor M3.

  Further, the transfer unit 20 moves from the standby position shown in FIG. 4 to the standby position shown in FIG. After the disc D is ejected, the holding claws 46b, 47b and 48b are returned to the state shown in FIG. Further, the insertion slot 2 is closed.

  In this way, the storage type disc device 100 loads (loads) the disc D inserted from the disc insertion slot 2 into the housing 1 by the transfer unit 20 and puts it in the tray 31 stacked in the disc thickness direction. Can be stored. Further, the disk D selected from the stored tray 31 can be driven to rotate by the drive unit 10 and data can be read or recorded on the disk by the optical head 16.

  Next, the control system of the disk device 100 will be described with reference to FIG. FIG. 17 is a block diagram of the control system. In the disk device 100, a control unit 80 composed of a microcomputer controls the overall operation of the device.

 The disk D is rotated at a constant linear velocity by the spindle motor 81, and reading of information from the disk D or recording of information on the disk D is performed by the optical head 16. The optical head 16 is moved in the radial direction of the disk D by the thread motor 82. The servo controller 83 controls the rotation of the spindle motor 81 under the control of the control unit 80, and also controls the tracking control, focus control, and driving of the sled motor 82 of the optical head 16.

 The RF amplifier 84 amplifies the RF signal corresponding to the information read by the optical head 16 and transmits it to the next stage. Further, the RF amplifier 84 separates the focus control signal and the tracking control signal from the RF signal, and sends these control signals to the servo controller 83.

  The digital signal processing circuit 85 digitizes the RF signal output from the RF amplifier 84, and performs demodulation processing and error correction processing of the digitized signal. A memory 86 such as an SDRAM is connected to the digital signal processing circuit 85, and for example, file information such as MP3 compressed music data is temporarily stored in the memory 86 so as to be readable and writable. The file information read from the memory 86 is supplied to the decoder 87, which decompresses, for example, MP3 compressed music data and converts it into uncompressed normal music data.

  The control unit 80 includes a memory 88 and a counter 89, and a host interface 90 is connected to the control unit 80. The host interface 90 sends a command from a host (not shown) to the control unit 80 and sends data of the disk device 100 to the host.

  Furthermore, motor drivers 91, 92, and 93 that drive the first motor M1, the second motor M2, and the third motor M3 are connected to the control unit 80. The control unit 80 is supplied with detection results from the sensors 50, 44 and 45, and the sensors S1 and S2. The sensor 50 detects whether or not the disk D is held in the disk storage unit 30, and the sensors 44 and 45 detect the number of rotations of the selection shaft 32 and select the tray 31. Further, whether or not the disk D is held by the transfer rollers 231 and 232 is detected by the sensors S1 and S2.

  The first motor M1 and the second motor M2 are driven and controlled by motor drivers 91 and 92, respectively, and perform rotation of the drive unit 10 and revolution control of the transfer unit 20. The selection shaft 32 is rotationally controlled to select the disk D or the like. The third motor M3 is driven and controlled by the motor driver 93 and controls the rotation of the transfer rollers 231 and 232. The drive unit 10 is supported by the support base 13, and the drive unit 10 (and the turntable 11) moves up and down as the support base moves up and down, but the lifting mechanism is omitted.

  By the way, in the stowable disk device 100, when the disk D is loaded, it is not correctly centered, and the rotation center of the turntable 11 and the position of the center hole of the disk D may shift. As a cause of the centering error, it is conceivable that the mechanical parts cross each other. Eccentric discs and discs with abnormal outer shapes also cause centering errors.

  For example, when a part of the outer periphery of the disk D is missing as shown in FIG. 18, centering is performed in accordance with the outer peripheral edge of the disk, so that a centering error may occur. In addition, when a foreign substance such as paper is mixed at the time of loading a disk, or the center hole of the disk D is deformed or a burr is generated, a centering error is caused.

  Also, the disk D is clamped by the clamp claw 61. If the clamp claw 61 is not sufficiently stored when the clamp is released, the clamp may fail due to being caught at the edge of the center hole of the disk at the next clamping. There is also sex. When the clamp claw 61 does not normally fit in the center hole of the disk D, the clamp claw 61 opens under the disk D, and the clamping fails as shown in FIG.

  FIG. 19A shows a state where the disc D is not centered well and the disc D is placed on the protrusion 11b of the turntable 11. FIG. FIG. 19B shows an enlarged view of a clamping error state in which the clamp pawl 61 is opened under the disk D.

  When a clamping error occurs, the disk D cannot be reproduced, so that the drive unit 10 is lifted, and the disk D is once separated from the turntable 11 and retried to normally clamp again. When the drive unit 10 is lifted, the disk D is held by the guide member 70 and further held by the transfer rollers 231 and 232 of the transfer unit 20 as described in FIG. The disk D is lowered and the disk D is separated from the turntable 11.

  However, when a disc D clamping error occurs as shown in FIG. 19, the raised position of the disc D is different from the normal height position. For this reason, as shown in FIG. 20, the disk D collides with the guide member 70, and the disk D cannot be held. For this reason, the subsequent mechanical operation cannot be performed and the mechanical stack is reached.

  Further, as shown in FIG. 21A, the disk D collides with the unit frame 21 holding the transfer rollers 231 and 232, or the disk D rides on the unit frame 21 as shown in FIG. End up. For this reason, the transfer unit 20 cannot rotate to the maximum angle (position shown in FIG. 6), and the sensors S1 and S2 do not detect the disk D. Therefore, the control unit 80 holds the disk D by the transfer rollers 231 and 232. Since it is determined that the disk D has not been formed, the disk D is not ejected and the mechanical stack is reached.

  That is, if the clamping by the clamp claw 61 is released in a state where the holding of the disk by the guide member 70 and the holding of the disk D by the transfer rollers 231 and 232 are not performed, there is no one holding the disk D. Disk D falls. Therefore, in order to prevent the disc from falling, the operation is not shifted to the clamp release operation when the disc D is not held by the guide member 70 and the transfer rollers 231 and 232. For this reason, if the disc D is clamped mistakenly, the disc cannot be reproduced and the eject operation cannot be performed and the disc is stuck in the mechanical stack.

  Therefore, in the disk device 100 of the embodiment, when a disk centering error (clamping error) occurs, the disk D ejection process is retried several times, and during that time it is determined that the disk clamping has failed, and Confirm that disk clamping has failed in focus processing and perform recovery processing. In the recovery process, the disk D is held by the guide member 70 and the transfer rollers 231 and 232 at the same height position (standby position) as when playing without raising the drive unit 10, and then the clamp is released, Prevent stacking and return to normal.

  That is, when a disc clamping error occurs and the disc cannot be released, the following operations A to E are checked. If the disc cannot be operated, NG points (A to E) are stored in the internal memory of the control unit 80. (RAM) 88.

A. Ascending operation of the drive unit 10,
B. Disc holding operation by the guide member 70;
C. Rotational movement of the transfer unit 20,
D. Disk holding operation by the transfer rollers 231 and 232;
E. Lowering operation of drive unit 10 (clamp release)
Then, after performing the ejection retry a predetermined number of times (can be set by the product to be mounted), the NG point is confirmed. If the above operations B, C, and D are impossible, there is a possibility that the disc is caused by a clamping error. Therefore, when the NG points B, C, and D are recorded, the drive unit 10 is once lowered to the height position at the time of play to check the disc clamp by the focus process, and whether or not a clamp error has occurred. Is accurately determined.

  If it is determined that a clamping error has occurred, the ejecting operation is performed while the drive unit 10 remains at the play height position. In the discharging operation, the holding of the disk D by the guide member 70, the rotation of the transfer unit 20, and the holding of the disk D by the transfer rollers 231 and 232 are executed. Thereafter, the disc is released from the clamp (up and down operation of the drive unit 10), and the disc D is ejected. By such processing, even when a disc D clamping error occurs, it can be prevented from falling into the mechanical stack, and the success probability of the ejecting operation can be improved. Note that the above-mentioned clamping mistake may occur not only when the disk D is inserted from the disk insertion slot but also when the disk is changed in the disk storage unit 30. Therefore, falling into the mechanical stack can be reduced.

  22 to 24 are flowcharts showing the ejecting operation at the time of the above-described clamping mistake. In FIG. 22, step S1 is a start step of releasing the clamp when a clamping error occurs. In step S2, the retry count is cleared, and in step S3, the NG point is cleared. The number of retries is counted by the counter 89.

  In step S4, as shown in FIG. 11B, the drive unit 10 is raised to a position higher than the play position, and in step S5, it is determined whether the drive unit 10 is raised (is in the clamp position). When the drive unit 10 is lifted, the guide member 70 is slid in step S6 as shown in FIG. 11C. On the other hand, if it is determined in step S5 that the drive unit 10 does not rise, it is determined in step S7 whether or not a predetermined time has elapsed. If it is within the predetermined time, the process returns to step S5. NG point A is recorded, and the process proceeds to step S27 in FIG.

  In step S9, it is determined whether or not the guide member 70 has slid. If it is normal, the guide member 70 slides as shown in FIG. 11C, and in step 10, the transfer unit 20 is rotated. On the other hand, as shown in FIG. 20, when the disc D has a clamping error, the guide member 70 cannot slide, so it is determined whether or not a predetermined time has elapsed in step S11. If so, NG point B is recorded in step S12, and the process proceeds to step S27 in FIG.

  In step S13, it is determined whether or not the transfer unit 20 has been rotated to the maximum angle. If it is normal, the transfer unit 20 rotates as shown in FIG. 4, and in step S14, it is confirmed whether or not the disk D is held by the transfer rollers 231 and 232. On the other hand, if the disc D is in a clamping error as shown in FIG. 21A, the disc D collides with the unit frame 21 and the transfer unit 20 cannot rotate to the maximum angle, so whether or not a predetermined time has passed in step S15. If it is within the predetermined time, the process returns to step S13. If timed out, NG point C is recorded in step S16, and the process proceeds to step S27 in FIG.

  In step S17, the light shielding state of the sensors S1, S2 is determined, and it is determined whether or not the disk D is held by the transfer rollers 231, 232. If the sensors S1, S2 are in the light shielding state (FIG. 12), driving is performed in step S18. The unit 10 is lowered to the standby position. When the sensors S1 and S2 are not shielded as shown in FIGS. 21A and 21B, since the disk D is not held by the transfer rollers 231 and 232, it is determined whether or not a predetermined time has elapsed in step S19. If timed out, NG point D is recorded in step S20, and the process proceeds to step S27 in FIG.

  In step S21, it is determined whether or not the drive unit 10 is in the standby position. If the drive unit 10 is in the standby position, the retry counter is cleared in step S22, the NG point is cleared in step S23, and the process ends normally in step S24. .

On the other hand, if the drive unit 10 is not in the standby position, the process proceeds from step S21 to step S25. In step S25, it is determined whether or not a predetermined time has elapsed. If it is within the predetermined time, the process returns to step S1, and a timeout occurs in step S25. If so, NG point E is recorded in step S26, and the process proceeds to step S27 in FIG.

  Step S27 in FIG. 23 increases (+1) the value of the retry count when any of the NG points (A to E) in FIG. 22 is recorded. In step S28, it is determined whether or not the retry count has reached a predetermined value (for example, 5), that is, whether or not the retry has been performed a predetermined number of times. If the predetermined number of times has not been reached, the process returns to step S4 in FIG. , Retry.

  If it is determined in step S29 that the retry count has reached a predetermined value (for example, 5), it is determined in step S30 whether the NG point is B, C, or D. If the NG point is other than B, C, or D, For example, the process returns to step S4 in FIG. If the NG point is B, C, or D, the process proceeds to step S34 in FIG.

  If the retry count is greater than or equal to a predetermined value (eg, 5) in step S29, the retry count is cleared in step S31, the NG point is cleared in step S32, and an error state is displayed in step S33.

In step S34 of FIG. 24, the drive unit 10 is lowered and moved to the standby position.
In step S35, the guide member 70 is slid. In step S36, it is determined whether or not the sliding is completed. If there is a clamping mistake, the disk D is placed on the convex portion 11b of the turntable 11 as shown in FIG. 19, but by lowering the drive unit 10, the guide member 70 can slide as shown in FIG. become. If the sliding of the guide member 70 is completed, the transfer unit 20 is rotated in step S37. If the slide is not completed in step S35 and the time is up in step S38, the process proceeds to step S31 in FIG.

  In step S39, it is determined whether or not the transfer unit 20 has been rotated to the maximum angle. If the transfer unit 20 has been rotated, the holding state of the disk D by the transfer rollers 231 and 232 is confirmed in step S40. If it is not turned to the maximum angle in step S38 and the time is up in step S41, the process proceeds to step S31 in FIG.

  In step S42, it is determined whether or not the sensors S1 and S2 are in a light shielding state. If the sensors S1 and S2 do not block light, the process proceeds to step S31 in FIG. In step S44, it is determined whether or not the drive unit 10 is in the raised position. If it is in the raised position, the drive unit is lowered and returned to the standby position in step S45, and the disk D is released from the turntable 11. If the drive unit 10 does not descend in step S44 and the time is up in step S46, the process proceeds to step S31 in FIG.

  In step S47, it is determined whether or not the drive unit 10 is in the standby position. If the drive unit 10 is in the standby position, the disk D has been ejected, so the process proceeds to step S23 in FIG. And migrate. If it is determined in step S47 that there is no standby position and time is up in step SS48, the process proceeds to step S31 in FIG. Proceeding from step S31 to step S33 is an error state, and therefore, a separate response from a service person is required.

  Further, when the disc D is not normally placed on the turntable 11 due to a clamping mistake and is placed on the convex portion 11b, a focusing error signal is determined by performing a focusing process, and the clamping mistake is performed. It is judged more accurately whether or not.

  That is, the optical head 16 includes a laser diode (LD) and an objective lens, but in the same way as in normal focus processing, the objective lens is moved closer to the disk in the light emission state of the LD, and the focus error signal is detected. To monitor. When a focus error signal is detected, it is determined that the clamp state is normal. If a focus error signal cannot be obtained within a predetermined period (for example, 186 msec), the lens is turned down and the focus error signal is similarly monitored during a period of 186 msec. If a focus error signal is not obtained even after three reciprocations, it is determined that a clamping error has occurred.

  Astigmatism method is used for signal detection in the focusing process as shown in FIG. In the astigmatism method, a cylindrical lens is placed in the return optical path from the disk D, and the beam that has passed through the cylindrical lens is first a vertically long elliptical beam, then close to a perfect circle, and then becomes a horizontally long elliptical beam. Is detected. As the distance to the disk D changes, the positions of these points also change. Thereby, a focus error signal is detected.

  The light reflected by the disk D hits a four-divided photodetector, and at that time, it is possible to determine whether or not it is an appropriate focus (position) by taking and controlling the difference of the sum of diagonals. The focus state is detected by the shape of the beam spot with astigmatism by the four-light detector.

  As shown in FIG. 26, each detection output of the light receiving surfaces A to D of the photodetector is proportional to the area of the beam spot. When ((A + C)-(B + D)) is output as a focus error signal (FOK) and a disc exists, an output waveform (FOK: S-shaped) as shown in FIG. 26 is obtained. When the disk D is not normally clamped, since there is no S-shaped output, it can be determined that there is a clamping error.

  FIG. 27 and FIG. 28 are flowcharts showing a clamp mistake determination process by the focus process. In FIG. 27, step S51 is a focus search start step. In step S52, the counter is set to zero, and then the counter is incremented in step S53. In step S54, it is determined whether or not the counter value is larger than a predetermined value (3 in this example). If it is smaller than the predetermined value, the spindle motor 81 is rotated in step S56. If it is equal to or greater than the predetermined value, it is determined in step S55 that a clamping error has occurred.

  In step S57, a FOSET command is transmitted, the LD is illuminated, and the lens is raised. In step S58, it is determined whether or not a focus error signal is obtained. If it is obtained, a DMOFF command is transmitted in step S59, the CLV (Constant Linear Velocity) servo is turned off and the spindle motor 81 is set in a free-run state. In step S60, the focus search is terminated.

  If a focus error signal cannot be obtained in step S58, the process proceeds to step S62 in FIG. 28 after waiting for a predetermined time (for example, 186 msec) in step S61.

  In step S62 of FIG. 28, a DMOFF command is transmitted, the CLV servo is turned off, the spindle motor 81 is set in a free-run state, and it is determined whether or not a focus search signal is obtained in step S63. At S64, the focus search is terminated. If a focus error signal is not obtained in step S63, the spindle motor 81 is rotated in step S66 after waiting for a predetermined time in step S65, a FORST command is transmitted in step S67, and the lens is lowered.

  In the next step S68, it is determined whether or not a focus error signal is obtained. If it is obtained, a DMOFF command is transmitted in step S69, and the process proceeds to a focus search end step S74. If a focus error signal cannot be obtained in step S68, a predetermined time elapses in step S70, a DMOFF command is transmitted in step S71, the CLV servo is turned off, and the spindle motor 81 is set in a free run state. In step S72, it is determined whether a focus error signal is obtained. If a focus error signal is obtained, the focus search is terminated in step S74. If the focus error signal is not obtained in step S72, the process proceeds to step S53 in FIG. 27 after waiting for a predetermined time in step S73.

  Thus, the lens up and lens down are performed to monitor the presence / absence of the focus error signal. If no focus error signal is obtained even after three reciprocations, it is determined in step S55 that a clamp error state has occurred.

  As described above, in the embodiment of the present invention, recovery processing can be performed when a disc clamping error occurs, and the disc can be ejected while avoiding the mechanical stack and the disc drop. The retractable disk device can release the clamped state when a clamping error occurs during the disk change.

  The present invention is not limited to the above description, and various modifications can be made without departing from the scope of the claims. For example, the storage device is not limited to a storage disk device, and may be a disk device that loads and reproduces a single disk.

DESCRIPTION OF SYMBOLS 1 ... Housing | casing 2 ... Disc insertion slot 3 ... Housing | casing 10 of a disk storage part ... Drive unit 11 ... Turntable 16 ... Optical head 20 ... Transfer unit 21 ... Unit frame 231, 232 ... Transfer roller 30 ... Disc storage part 31 ... Tray 32 (32a, 32b, 32c) ... selection shaft 34 ... bearing 40 ... rotation detectors 44, 45 ... optical sensors 46, 47, 48 ... holding member 50 ... holding sensor 60 ... clamp mechanism 61 ... clamp claw 70 ... guide member DESCRIPTION OF SYMBOLS 80 ... Control part 81 ... Spindle motor 82 ... Thread motor 83 ... Servo controller 84 ... RF amplifier M1, M2, M3 ... Motor 100 ... Storage type disk apparatus

Claims (7)

A turntable on which a disk is placed; and a drive for raising and lowering the turntable to rotationally drive the disk at a first height position and to raise the disk to a second height position when the disk is ejected Unit,
A transfer unit that holds the disc inserted into the disc insertion slot, carries the disc to a second height position on the turntable, and holds the disc when discharging and guides the disc from the turntable to the disc insertion port; ,
A clamp mechanism for holding the periphery of the center hole of the disk to the turntable surface when rotating the disk;
A guide member for holding a peripheral edge of the disc when the disc is raised to the second height position;
When the disc is at a position higher than the turntable surface due to a clamping error of the clamp mechanism, the disc is held by the guide member and the transfer unit and the turntable is moved up and down at a position where the turntable is lowered. And a controller that performs a recovery process so as to release the clamp.   2. The control unit determines that the clamping error occurs when the disk is in the second height position and the disk cannot be held by the guide member and the transfer unit. Disk unit.   2. The control unit according to claim 1, wherein when the clamping error occurs, the disk is rotationally driven to determine the presence or absence of a focus error signal, and when the focus error signal cannot be obtained, the control unit confirms that the clamping error has occurred. The disk device described.   The control unit executes a disk ejection retry for a preset number of times when the clamping error occurs, determines the clamping error during the retry, and performs the recovery process after the retry. Item 2. The disk device according to Item 1.   4. The disk apparatus according to claim 3, wherein the control unit determines the presence or absence of the focus error signal by moving the optical pickup closer to or away from the surface of the disk by a preset number of times.   The clamp mechanism has clamp claws that project radially from the center of the turntable as the turntable moves up and down, and the periphery of the center hole of the disk is rotated by the clamp claws when the disk is driven to rotate. The disk device according to claim 1, wherein the disk device is held on the turntable surface.   The holding mechanism for supporting the outer periphery of the disk at the second height position when the disk is carried in by the transfer unit and when the disk is ejected. Disk unit.

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