JP4996564B2 - Recording / reproducing apparatus and driving method thereof - Google Patents

Description

  The present invention relates to a recording / reproducing apparatus and a driving method thereof, and more particularly to a recording / reproducing apparatus for a thin optical disk and a driving method thereof.

  In recent years, there has been a demand for information recording media to record large volumes of digital data, such as the start of digitization of television broadcasting. For example, in the field of optical discs, one of the basic methods for increasing the density is to reduce the diameter of the light spot focused on the optical disc for recording and reproducing information. In the following, an optical disk will be described as a representative, but a disk used in a recording / reproducing apparatus (also referred to as a disk drive apparatus) targeted by the present invention is a disk-shaped disk such as a phase change memory, a magneto-optical memory, or a hologram memory. It is intended for all recording media and is not limited to an optical disc.

  In the conventional optical disk and its disk drive device, for example, in a reproduction or write-once / rewritable optical disk, such as an optical disk (Blu-ray Disc or HD-DVD) using a widely used CD, DVD, blue-violet laser, etc. It is composed of a polycarbonate substrate with a disc diameter of 120 mm and a disc thickness of 1.2 mm, and the rotation start is carried on the pedestal attached to the spindle and then rotated as it is, and then the data is recorded and reproduced by the operation of the pickup that irradiates laser light Is going.

  With the increase in recording information capacity, a higher data transfer rate is demanded. For example, a transfer rate in video recording of a broadcast HDTV is said to be 250 Mbps or more. When this transfer rate is realized over the entire recording surface of the disc, the disc needs to be rotated at a high speed of 15000 rpm or more in order to secure the transfer rate at the inner periphery. Even in such a high-speed rotation, it is necessary to reduce the disk runout due to the high-speed rotation from the viewpoint of tracking the focus servo on the disk surface during recording and reproduction. Further, in order to perform recording at high density by narrowing down the laser in response to an increase in recording information capacity, it is very important that the disk surface shake during disk rotation, that is, the amount of surface vibration is small.

  Conventionally, as a countermeasure against surface run-out due to vibration of a rigid disk, a disk vibration preventing device that rotates while holding the disk on a turntable by an elastic body is known. In these vibration preventing devices, a commonly used rigid material disk is fixed to a turntable (spindle) via an elastic material. The elastic material prevents vibration (resonance) when the disk is rotated and vibrations due to poor coupling due to dust trapped in the disk holding portion. However, a disc made of a rigid material is not suitable for recording / reproducing at a high-speed rotation exceeding 10,000 RPM.

  Therefore, an optical disk using a thin optical disk (hereinafter referred to as “thin optical disk”) having a thickness of 0.08 to 0.2 mm by a polycarbonate film and an optical transmission layer having a thickness of 0.1 mm or less is known. As for the driving device for this thin optical disk, for example, a data capacity composed of an optical system having an objective lens NA of 0.55 to 0.66 (a laser light source is near 405 nm and the objective lens NA is 0.85) In the case of a 120 mm disk having a capacity of about 23 to 25 GB (about 15 GB for NA 0.65) (for example, a DVD format or HD-DVD format device), the optical correction layer is about 0.5 mm. Necessary.

  In the case of a disk having a diameter of 120 mm and a capacity of about 23 to 25 GB, a thin optical disk using a stabilizer is placed on a pedestal attached to the spindle and rotated. Is possible. For this reason, there is a flexible disk as a disk suitable for high-speed rotation. As a countermeasure against surface runout accompanying high-speed rotation of a flexible disk, a method using aerodynamic stabilization means when the disk is rotated at high speed has been proposed. When a flexible disk is rotated at a high speed, it does not run out due to resonance as in a rigid material disk, but a wobble phenomenon such as a wavy phenomenon associated with high-speed rotation of a flexible disk-shaped disk. It is easy to happen. Further, a flexible disk has a sag phenomenon due to gravity before starting rotation or during low-speed rotation.

  As disclosed in Patent Document 1, a stabilizer is disposed below the disk surface, and is rotated simultaneously with the disk so that the stabilizer can be supported even when the disk hangs down due to gravity. There is an optical disk drive device having an optical transmission layer / posture control plate (stabilizer) that also has a function of condensing light.

Also, a method using an aerodynamic stabilization means is known for surface runout at high speed rotation. For example, in the optical disk drive devices disclosed in Patent Document 2 and Patent Document 3, a stabilizer having a flat shape or a certain curved shape is placed close to the disk surface from above the disk at an interval of about 0.1 mm. Therefore, the surface shake is suppressed as compared with the conventional 1.2 mm-thick optical disc, and high-precision reading is possible even at a high speed. At this time, it is known that the amount of runout is reduced when the high-speed rotation region, that is, the rotation speed is 4000 rpm or more.
JP 2006-344291 A JP 2006-107699 A JP 2007-149411 A

  In the thin optical disk drive device disclosed in Patent Document 1, when an apparatus having an objective lens NA of about 0.85 and a 120 mm disk having a capacity of about 23 to 25 GB is used, the optical transmission layer thickness is set to 0. Although it needs to be around 1 mm, the disc itself has this optical transmission layer, so that it is not possible to adopt a configuration in which an optical transmission layer / posture control plate is inserted between the disc and the objective lens.

  Also, when starting a thin optical disk such as Patent Document 2 or Patent Document 3, the disk itself hangs down from the center of the disk toward the outer periphery due to its thinness and softness before being mounted and rotated. When applied to a generally used optical disk recording apparatus, when accelerating to a certain rotational speed, the disk may come into contact with the peripheral portion (chassis) of the disk drive, damaging the disk itself and data. In general, thin optical discs gradually flatten due to centrifugal force as the rotational speed increases, but the aerodynamic stabilization effect does not work much when rotating at a low speed of 4000 rpm or less or when accelerating from 0 rpm. The problem that the surface run-out amount becomes extremely large under the influence of gravity is inevitable.

  In view of the above-described problems, an object of the present invention is to provide a recording / reproducing apparatus capable of stably rotating a flexible thin disk even in a low-speed rotation region and a driving method thereof.

In order to solve the above problems, the present inventors have completed the following invention.
The present invention relates to a rotating mechanism for rotating a flexible disk for recording information, and a rotatable disk shape that is disposed close to the disk so as to oppose the disk and stabilizes the shape of the rotating disk. A first stabilizer and a second stabilizer that is arranged so as to be detachable from the first stabilizer and stabilizes the shape of the first stabilizer, and at least recording and reproducing information to and from the disc A recording / reproducing apparatus that performs one of the above, wherein the first stabilizer rotates in a direction opposite to the rotation direction of the disk, and a relative speed with respect to the disk is a constant value. .

  In a preferred aspect of the present invention, the surface of the second stabilizer facing the first stabilizer is curved in a planar shape or a concave shape.

  The present invention relates to a method for driving a recording / reproducing apparatus that performs at least one of recording and reproduction of information with respect to a flexible disk, wherein a first stabilizer is disposed so as to face the disk, and the disk The first step of rotating at a constant rotational speed in the direction opposite to the direction of rotation of the disk, and rotating the disk to increase the rotation speed, and the rotation speed of the first stabilizer to determine the relative speed to the disk A second step of lowering to a constant value, a third step of rotating the disc at a constant speed that stabilizes the rotational shape, and stopping the rotation of the first stabilizer; A fourth step of closely contacting the second stabilizer, which has been separated from the other stabilizer, to the first stabilizer, and the rotational speed of the disk, A fifth step of raising recording or the rotational speed of reproducing a driving method of the recording and reproducing apparatus which comprises a.

  ADVANTAGE OF THE INVENTION According to this invention, the recording / reproducing apparatus which can rotate stably the thin disk which has flexibility also in a low speed rotation area, and its drive method can be provided.

  The recording / reproducing apparatus of the present invention has a rotating mechanism that rotates a flexible and recording disk and a rotation mechanism that is disposed close to the disk so as to face the disk and stabilizes the shape of the rotating disk. A disc-shaped first stabilizer that is possible, and a second stabilizer that is disposed in proximity to the first stabilizer and stabilizes the shape of the first stabilizer. In the recording / reproducing apparatus that performs one of them, the first stabilizer can rotate in the direction opposite to the rotation direction of the disk, and the relative speed with the disk is a constant value. A flexible thin disk that rotates at a high speed can be rotated relatively stably by centrifugal force. However, in a low-speed region, the flexible thin disk rotates while hanging or waved due to the influence of gravity or interference with surrounding air. Such a change in the shape of the flexible thin disk is called “surface shake”. In addition, surface shake is occurring even in the high-speed rotation range. If the disc is shaken more than a predetermined width while the disc is rotating, information cannot be recorded / reproduced, and there is a risk that the recorded content may be damaged or the disc itself may be destroyed by contact with peripheral components.

  The recording / reproducing apparatus of the present invention can suppress not only the high-speed rotation range of such a flexible thin disc but also the surface shake in the low-speed rotation range. In general, a stabilizer in a recording / reproducing apparatus functions to suppress surface deflection during rotation of a flexible thin disk. However, the recording / reproducing apparatus of the present invention mainly prevents surface deflection during low-speed rotation of the disk. The first rotatable stabilizer that suppresses the second stabilizer, and the second stabilizer that mainly suppresses surface blurring during high-speed rotation of the disk from the outside of the first stabilizer (on the opposite side to the thin disk side) via the first stabilizer. And a stabilizer.

  The first stabilizer rotates coaxially with the disk, but rotates in the opposite direction to the disk. Then, while the rotation of the disk is stopped, the disk is rotated to a certain number of rotations so as to be close to the disk, and then the disk is started. As the rotational speed of the disk increases, the rotational speed of the first stabilizer is decreased, and the relative rotational speed of both is kept at a substantially constant value. Note that the relative rotational speeds of the first stabilizer and the disk may not be strictly constant values, and may be constant values within a range in which the aerodynamic action acting between them is regarded as equivalent. Then, when the rotational speed of the disk increases to the predetermined rotational speed, the rotational speed of the first stabilizer becomes zero. Here, it is preferable that the constant rotational speed corresponds to a rotational speed exceeding a low speed range where the rotational shape of the disk is unstable. In general, the rotational speed at which the disk is stabilized in a recording / reproducing apparatus equipped with a stabilizer is about 4000 rpm, and the constant rotational speed is preferably about 4000 rpm. When the number of rotations of the first stabilizer becomes zero, the disk is shaped so that the disk is opposed to the second stabilizer with the first stabilizer sandwiched between or in close proximity to the first stabilizer. Rotate while being stable. In addition, it is preferable that the shape of the opposing surface of a 2nd stabilizer is planar shape or concave shape. In such a state, the recording / reproducing apparatus can record or reproduce stable information on the disc at a desired number of rotations. In general, the rotational speed of a disk for recording or reproducing information is equal to or higher than the rotational speed at which the disk is stabilized, and is preferably, for example, about 10,000 rpm or more and about 15000 rpm.

  When stopping recording / reproducing on the disc, the rotation of the disc is lowered to a constant rotational speed, for example, 4000 rpm, and when the constant rotational speed is reached, the second stabilizer is separated from the first stabilizer. While rotating the stabilizer in the opposite direction to the rotation of the disk so that the relative rotation speed of the first stabilizer and the disk is constant, the rotation speed of the disk is lowered to stop the disk. Note that the relative rotational speed of the first stabilizer and the disk may not be strictly constant. When the disc rotation speed is slow, the first stabilizer and the disc only need to maintain a relative speed that can exert the aerodynamic action through the narrow gap and suppress the sag due to the gravity of the disc. . The first stabilizer may be stopped after the rotation of the disk is stopped. If necessary, the first stabilizer may be stopped after separating the disk and the first stabilizer or after removing the disk from the recording / reproducing apparatus.

  The first stabilizer can be made of any material, but it is made of a rigid material made of metal or acrylic resin, or has a rigidity that hardly sags under the influence of gravity even when stationary. However, a somewhat flexible polymer film, particularly a polycarbonate film or a metal having a thickness of 0.2 mm to 0.3 mm is preferable. When the second stabilizer approaches and comes into close contact with the first stabilizer, the surface shape of the first stabilizer becomes the same as the surface shape of the second stabilizer. It is preferable to deform as described above. Thereby, in the high-speed rotation area of the disk, the surface of the first stabilizer facing the disk can be adjusted by the surface shape of the second stabilizer. In addition, when the 1st stabilizer is not closely_contact | adhered with the 2nd stabilizer, it is preferable to maintain the disk shape. In particular, the disk shape is preferably maintained while the first stabilizer is rotating.

(First embodiment)
A specific recording / reproducing apparatus of the present invention and a driving method thereof will be described below.
FIG. 1 is a side view showing steps from activation of a rotating mechanism of a thin optical disk (hereinafter abbreviated as a disk) to steady rotation for recording / reproducing according to the recording / reproducing apparatus of the present invention. FIG. 2 shows a time chart from the start of the disk rotation mechanism to the steady rotation. The recording / reproducing apparatus of the first embodiment will be described below with reference to FIGS.

  In FIG. 1, (1) is a state before the rotation of the thin optical disk and the rotation of the first stabilizer is increased to 4000 rpm, and (2) is the speed of the thin optical disk starting to rotate and increasing to 4000 rpm. The state (3) is a state in which the thin optical disk is in a steady rotation and recording / reproduction is performed. Note that the rotation speed of the first stabilizer is decreased from 4000 rpm to 0 rpm in the state (2).

  In the rotation mechanism of the first embodiment, a spindle motor 4 for rotating a disk 1 is disposed on a chassis 6 of a recording / reproducing apparatus. In FIG. 1, the center of the disk 1 is on the axis of the spindle motor 4. And is driven by the spindle motor 4. In FIG. 1 (1), since the disc 1 is stationary, the outer peripheral portion hangs down due to gravity. On top of the disk 1, a first stabilizer 3 and a second stabilizer 2 are arranged with a small space between them. The second stabilizer 2 is not rotatable, but the first stabilizer 3 is connected to the spindle motor 5 via the rotating shaft 7 and has the same central axis as the disk 1 and reversely rotates at different rotational speeds. Is possible. The first stabilizer 3 can be moved to the disk 1 side, and the second stabilizer 2 can be moved to the first stabilizer 3 side.

(Recording / reproducing operation by recording / reproducing device)
A recording / reproducing operation from the disc 1 by the recording / reproducing apparatus of the present invention will be described with reference to FIGS. 1 (1) to 1 (3) and FIG. FIG. 1A shows a state before the disk 1 is rotated, and the disk 1 is loaded so that it can be rotated by a spindle motor 4 of a rotating mechanism (disk drive). At this time, the disk 1 is stopped, and the disk 1 is in a state in which, for example, the outer peripheral portion hangs down by about 2 mm.

  The stabilizer includes a first stabilizer 3 and a second stabilizer 2. The first stabilizer 3 is a stabilizer capable of rotating in the direction opposite to the rotation direction of the disk 1 and accelerating / decelerating. The shape of the surface adjacent to the disk 1 is flat or when the rotation of the optical head is stopped. It can be a concave surface curved with a certain degree of curvature to the left and right with respect to the moving tangential direction (however, it may be stopped at a certain angle when stopping). Assuming that the disk 1 is 0.1 mm, the thickness of the first stabilizer 3 is assumed to be about 1 mm thicker than that. The first stabilizer 3 has substantially the same mass and hardness so that it does not hang down due to gravity even when it is stationary, and does not change its shape when it rotates close to the disc 1 at a speed of 4000 rpm while rotating at 4000 rpm. It is.

  The second stabilizer 2 does not rotate and can be separated from and connected to the first stabilizer 3. The second stabilizer 2 has such a weight and hardness that the shape does not deform even when the disk 1 rotates at a high speed (for example, 15000 rpm), and the thickness is higher than that of the first stabilizer 3. Those made of 5-10 mm acrylic or a metal such as copper or brass are preferred.

  The state shown in FIG. 1 (1) is the time chart according to the driving method of the recording / reproducing apparatus of the present invention shown in FIG. 2 before the recording / reproducing apparatus is activated ((when stopped), (A) in FIG. 2). From the region, the first stabilizer 3 is rotated up to 4000 rpm in the direction opposite to the rotational direction of the disk 1. At this time, as shown in FIG. 2, the amount of sag of the outer peripheral portion of the disc 1 (thin optical disc) is 2.0 mm, and the distance between the first stabilizer 3 and the disc 1 (near the center) is 0.1 mm. The first stabilizer 3 starts rotating in the direction opposite to the normal rotation direction of the disc 1 (state B region) and starts rotating at 4000 rpm (region (C)) with the start of driving by the spindle motor 5. In this state, the disk 1 has not yet been rotated, and the outer peripheral portion remains hanging. Note that the distance between the first stabilizer 3 and the second stabilizer 2 remains 1.0 mm (regions (A) to (C)).

  Like the conventional thin optical disk, the disk 1 has the property of stable rotation by reducing the surface shake at 4000 rpm or more if it is provided with a conventional fixed stabilizer. In the case of using a thin optical disk having a rotational speed other than 4000 rpm that enters the stable rotational area, the constant rotational speed of the first stabilizer 3 is set to the rotational speed that enters the stable rotational area (however, the rotational speed is opposite to that of the disk 1). You can do it.

  The distance between the first stabilizer 3 and the disk 1 is 0.1 mm, but this distance is such that the disk 1 has a minimum surface blur at 4000 rpm or more. In the case of a normal thin optical disk, when the distance between the first stabilizer 3 and the disk 1 is 0.1 mm, the amount of surface deflection of the disk 1 is about 10 μm. This interval may be adjusted appropriately according to the performance of the disk 1.

  Next, the disk 1 is started to rotate in the forward direction (here, clockwise when viewed from above in FIG. 1 (2)) by the spindle motor 4, and is accelerated at a uniform acceleration to 4000 rpm (FIG. 1 ( 2) and (D) region in FIG. 2). At this time, the rotation of the first stabilizer 3 is decelerated so that the rotation speed of the disk 1 and the relative speed (relative rotation speed) of the first stabilizer 3 are constant. During this time, the disk 1 changes from a sagging state of the outer peripheral portion to a horizontal state due to centrifugal force as the rotational speed increases. When the rotational speed of the disc 1 is low as in the conventional recording / reproducing apparatus, the disc 1 rotates while drooping greatly, and the disc 1 is damaged by rubbing against the chassis 6 portion on the lower side of the disc 1 or the recorded contents are The risk of damage can be reduced. In this way, the disk 1 can reach a steady state of 4000 rpm without causing a large surface shake like the conventional disk at the stage of accelerating the rotation speed from 0 rpm to 4000 rpm ( ((D) area | region of FIG. 2).

  Referring to the time chart shown in FIG. 2, in the region (D) of FIG. 2, the amount of sag of the outer peripheral portion of the disk 1 decreases as the rotational speed increases, and the surface of the disk 1 in the steady state. It falls within the range of 10 μm of shake. In the recording / reproducing apparatus of the present invention, before the disk 1 reaches 4000 rpm, for example, the disk 1 often reaches a steady state at about 2500 rpm. The first stabilizer 3 is decelerated so that the relative rotational speed with the disk 1 is maintained at 4000 rpm, and is stopped when the rotational speed of the disk 1 reaches 4000 rpm. As described above, in the recording / reproducing apparatus of the present invention, the low-speed rotation speed region, which is the unstable rotation region of the disk 1, is narrowed to 0 to 2500 rpm instead of 0 to 4000 rpm, and the amount of surface blur is also reduced. ing.

  When the disk 1 reaches 4000 rpm and the surface vibration of the disk 1 is stabilized, the second stabilizer 2 moves from above toward the first stabilizer 3 and is coupled to the first stabilizer 3 ((E of FIG. 2). )region). The bonding surface of the first stabilizer 3 and the second stabilizer 2 is adhered to the surface by adhering an adsorption rubber or the like so that the first stabilizer 3 does not vibrate even when the disk 1 rotates at a high speed (for example, 15000 rpm). It is preferable to do so. In this way, when the disk 1 reaches high speed rotation for executing recording and reproduction, the first stabilizer 3 and the second stabilizer 2 are integrated to promote the stability of the disk 1 as in the conventional stabilizer. It will behave as a stabilizer. In the recording / reproducing apparatus of the present invention, the time required to reach a stable region with little surface shake of the disk 1 is short, and the amount of surface shake is relatively large even in a rotational speed region called an unstable region of about 4000 rpm or less. Small and stable rotational speed is low.

  If the disk 1 reaches 4000 rpm or more and rotates stably with no surface shake, the disk 1 is raised to a desired number of revolutions (for example, 15000 rpm) (region (G) in FIG. 2), as in the conventional recording / reproducing apparatus. In addition, the recording / reproducing head is operated on the target track, and data can be recorded / reproduced on / from the disk 1 by, for example, a laser beam.

  When the recording / reproducing is finished and the recording / reproducing apparatus is stopped, the tracking servo operation and the focus servo operation of the recording / reproducing head are stopped, and the disk 1 is decelerated to a low speed (for example, 4000 rpm) in a stable region. . Then, the first stabilizer 3 is separated from the second stabilizer 2 and is separated by about 1 mm in the same manner as before the start of operation.

  When the second stabilizer 2 is separated from the first stabilizer 3, the operation is stopped by tracing the time chart of FIG. 2 from the (D) area to the (A) area, opposite to the operation start time. While the rotational speed of the disk 1 is further reduced from 4000 rpm, the first stabilizer 3 is rotated in the opposite direction to the disk 1, and the relative rotational speed between the first stabilizer 3 and the disk 1 is maintained at 4000 rpm. Decreases rotation and stops. Accordingly, the first stabilizer 3 rotates at 4000 rpm in the direction opposite to the rotation direction of the disk 1. The disc 1 tends to hang down due to gravity at the outer periphery as the rotational speed decreases, but does not hang down as in a conventional recording / reproducing apparatus. Due to the aerodynamic action of the rotating first stabilizer 3, the disk 1 is often stable at equal intervals with the first stabilizer 3 until a fairly low speed rotation. For this reason, when the rotational speed of the disk 1 is lowered as in the conventional recording / reproducing apparatus, the disk 1 hangs down, and the disk 1 is damaged by rubbing against the chassis 6 portion on the lower side of the disk 1 or the recorded contents are damaged. The risk of doing so can be reduced.

  After the rotation of the disk 1 is completely stopped, the rotation of the first stabilizer 3 is stopped to stop the operation of the entire apparatus. At this time, if necessary, the first stabilizer 3 may be moved above the disk 1 so that the disk 1 can be easily taken out.

  If the disk 1 is stabilized at, for example, about 2500 rpm, the maximum rotational speed of the first stabilizer 3 may be set to 2500 rpm in the (B) and (C) regions in the time chart of FIG. If the rotation speed of the first stabilizer 3 is lowered, power consumption can be reduced correspondingly, and energy saving operation can be achieved.

(Second embodiment)
FIG. 3 shows a time chart of the driving method of the recording / reproducing apparatus of the second embodiment corresponding to the time chart of FIG. The difference of the second embodiment from the first embodiment is that the first stabilizer 3 is separated from the disk 1 by about 0.4 mm when the operation of the recording / reproducing apparatus is started. In particular, when the first stabilizer 3 has a thickness of about 0.2 mm and has a certain degree of flexibility, the first stabilizer 3 starts rotating with a surface runout of about 0.3 mm at the start of rotation, and the centrifugal force increases with the increase in the number of rotations. As the force approaches the horizontal and the surface runout gradually decreases, the rotation of the first stabilizer 3 starts and then the distance between the first stabilizer 3 and the disk 1 gradually increases as the rotation speed of the first stabilizer 3 increases. Approach to 0.1 mm (see region (B) in FIG. 3). By doing in this way, when the stabilizer 3 has a certain degree of flexibility, there is no fear of contacting the disk 1 and the rotation can be accelerated.

  In the recording / reproducing apparatus of this embodiment, the area after (C) in FIG. 3 may be the same as the area after (C) in FIG. 2 of the recording / reproducing apparatus of the first embodiment. When the operation is stopped, the rotation of the disk 1 is stopped, and different operations are performed when the rotation of the first stabilizer 3 is stopped. In the recording / reproducing apparatus of this embodiment, as the rotational speed of the first stabilizer 3 decreases, the distance between the first stabilizer 3 and the disk 1 may be gradually increased to 0.4 mm. By doing in this way, even if the outer peripheral part of the 1st stabilizer 3 hangs down, there is no possibility of contacting the disk 1. FIG.

  According to the recording / reproducing apparatus and the driving method of the present invention, the disk rotates as much as possible without touching the chassis 6 of the peripheral disk device as much as possible at the time of rotational acceleration at the time of starting the disk. Since contact to the periphery as much as possible can be prevented, the data recorded on the disk can be stored for a long time without damaging the disk itself, and the reproducibility of the recorded data is maintained.

  The present invention is applied to a recording / reproducing apparatus, a disc assembly, and a disc cartridge that perform recording and / or reproducing processing on a flexible disc. It can be suitably applied to the cartridge and the recording / reproducing apparatus.

FIG. 3 is a side view of a disk rotating mechanism on which a thin optical disk is placed in the recording / reproducing apparatus of the present invention. (1) is a state before the thin optical disk is rotated, and the rotation of the first stabilizer is increased to 4000 rpm. In (2), the thin optical disk starts rotating and the speed is increasing toward 4000 rpm. Note that the rotational speed of the first stabilizer is lowered from 4000 rpm. (3) is a state in which the thin optical disk is in a steady rotation and recording / reproduction is performed. Time chart example (1) showing the operation of each part of the disk rotation mechanism in FIG. Time chart example (2) showing the operation of each part of the disk rotation mechanism in FIG.

Explanation of symbols

1: Disc (thin optical disc)
2: Second stabilizer 3: First stabilizer 4: Spindle motor (for disk drive)
5: Spindle motor (for first stabilizer drive)
6: Chassis (part of the recording / reproducing apparatus)
7: First stabilizer rotating shaft 8: Recording / reproducing head 9: Laser beam

Claims (3)

A rotating mechanism for rotating a disk having flexibility and recording information;
A rotatable disc-shaped first stabilizer that is disposed close to the disk so as to stabilize the shape of the rotating disk, and
A second stabilizer for stabilizing the shape of the first stabilizer, wherein the second stabilizer is arranged so as to be detachable from the first stabilizer;
A recording / reproducing apparatus that performs at least one of recording and reproduction of information on the disc,
The recording / reproducing apparatus, wherein the first stabilizer rotates in a direction opposite to a rotation direction of the disk, and a relative speed with the disk is a constant value.   The recording / reproducing apparatus according to claim 1, wherein a surface of the second stabilizer facing the first stabilizer is curved in a planar shape or a concave shape. A method of driving a recording / reproducing apparatus that performs at least one of recording and reproduction of information on a flexible disk,
A first step of disposing the first stabilizer so as to face the disk, and rotating the disk at a constant rotational speed in a direction opposite to the direction in which the disk rotates;
A second step of rotating the disk to increase the rotation speed and decreasing the rotation speed of the first stabilizer so that the relative speed with the disk becomes a constant value;
A third step of rotating the disk at a constant speed at which the rotational shape is stabilized, and stopping the rotation of the first stabilizer;
A fourth step of closely contacting the first stabilizer with the second stabilizer that has been separated from the first stabilizer;
A fifth step of increasing the rotational speed of the disc to a rotational speed for recording or reproducing information;
A method for driving a recording / reproducing apparatus comprising:

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