JP2009223932A - Disk rotating mechanism, disk, recording and reproducing device, and method for recording and reproducing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk rotating mechanism which normally rotates and drives a flexible disk without causing surface wobbling for a long period by avoiding accumulation of distortion in a disk inner periphery section even when rotating the disk at a speed exceeding 10,000 rpm. <P>SOLUTION: The disk rotating mechanism includes the flexible disk 1 in which information is recordable, a turntable 5 on which the disk 1 is held, a spindle 3 that rotates the disk held on the turntable 5, and a stabilizer 30 that stabilizes the rotating disk 1. In the disk rotating mechanism, a rotation transmitting device transmits the rotation of the spindle 3 to the disk 1 via the turntable 5, and a disk holding device holds the disk 1 so that the disk 1 is elastically deformable from a center of the rotation of the disk 1 in a radial direction of the disk. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disk rotation mechanism, a disk, a recording / reproducing apparatus, and a recording / reproducing method.

  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 the disk used in the recording / reproducing apparatus targeted by the present invention is intended for all disk-shaped recording media such as a phase change memory, a magneto-optical memory, and a hologram memory. It is not limited to optical disks.

  In order to perform high-density recording / reproduction by narrowing down the laser, it is important that the disc surface shake during the disc rotation, that is, the surface shake is small. 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.

  As a countermeasure against surface deflection due to vibration of a rigid disk, a method of rotating a disk by holding it on a turntable by an elastic body has been conventionally known. For example, there is a disk vibration preventing apparatus disclosed in Patent Documents 1 to 3. In these vibration preventing devices, a hard disk made of a rigid material that is normally used is fixed to a turntable (spindle) via an elastic material. The elastic material prevents vibration (resonance) when the hard disk is rotated and prevents vibration due to poor coupling due to dust trapped in the disk holding portion. However, a hard disk made of a rigid material is not suitable for recording / reproducing at a high-speed rotation exceeding 10,000 RPM.

  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 like a disk made of a rigid material, but does not run out like a wavy phenomenon associated with high-speed rotation of a flexible, disk-shaped disk. It is easy to happen. A method using aerodynamic stabilization means is known for this surface runout. For example, there is a stabilizing member (stabilizer) disclosed in Patent Documents 4 to 6. According to the recording / reproducing apparatus disclosed in Patent Documents 4 to 6, the disc and the stabilizing member can be obtained by devising the form of a stabilizing member (stabilizer) arranged around the disc surface with respect to the flexible disc. The disk surface is stabilized by utilizing the aerodynamic action of the information recording and reproduction of information at a stable position on the disk surface.

Specifically, in the information recording / reproducing apparatus disclosed in Patent Documents 4 and 5, a planar stabilizing member is made to act on a flexible recording disk surface, or a concavely curved stabilizing member. Is applied to the disk surface. Then, by adjusting the distance between the stabilizing member and the recording disk surface to, for example, 0.05 to 0.30 mm, the rotational drive of the disk can be stabilized even at high speed rotation exceeding 10,000 rpm. . In the information recording / reproducing apparatus disclosed in Patent Document 6, a spacer having an arbitrary thickness is inserted between the hard disk and the stabilizing plate, and the vibration of the disk is caused by the air flow flowing from the air introduction hole formed on the inner periphery. The method of suppressing is taken. In these methods, since the recording disk has flexibility and the effect of suppressing the disk vibration by the stabilizing member can be obtained, the conventional rigid body CD, DVD, BD, HD-DVD, etc. The recording disk has the potential to be driven in a high-speed rotation range of 10,000 rpm or more, which has been difficult to put into practical use. Actually, Patent Documents 4 to 5 describe high-speed driving up to around 15000 rpm.
JP-A-6-28752 Japanese Patent No. 2882379 Japanese Patent Laid-Open No. 5-54502 JP 2006-107699 A JP 2007-149411 A JP 2006-344291 A

  Practically, there has never been a recording / reproducing system for recording / reproducing by rotating a flexible recording disk at a high speed exceeding 10,000 rpm, and practical problems have been in an unknown area. The inventors have studied the problem of putting a disk rotating mechanism as shown in FIG. 18 with reference to the recording / reproducing system disclosed in Patent Document 5 to practical use of a disk having flexibility in high-speed driving. As a result, when the disk 1 having flexibility is sandwiched and fixed between the turntable 5 connected to the spindle 3 and the clamper 6 opposed to the turntable 5 and driven at a high speed rotation exceeding 10,000 rpm, Distortion occurs in the vicinity of the holding portion of the inner periphery of the disk 1 by the turntable 5, and the disk rotation speed increases and decreases, or the stabilization member 30 approaches and leaves (the stabilization member 30 changes the disk rotation speed). As a result, the distortion accumulates and increases. Due to the accumulated distortion of the disk 1, the disk 1 and the stabilizing member 30 may slide during driving in the low-speed rotation range. When the disk 1 and the stabilizing member 30 come into contact with and slide with each other, a large disk surface wobbling occurs and the signal quality of recording and reproduction by the recording head is deteriorated. Furthermore, repeating the rotation / stopping operation may cause a fatal problem that the disk 1 comes into contact with the stabilizing member 30 and the rotation of the disk 1 stops.

  Therefore, as disclosed in Patent Document 1 or 2, it has been studied to suppress the surface shake by interposing an elastic body between the turntable and the disk. However, even if only one side of the disk is fixed by an elastic material as in Patent Documents 1 and 2, the distortion of the disk at high speed rotation has not been reduced efficiently. Further, as shown in Patent Document 3, even if the disk is fixed from both sides by an annular elastic material, the contact surface between the elastic body and the disk becomes a thin line of the ring, and the contact position between the elastic body and the disk on the front and back sides Even with a slight deviation, the disc distortion was increased. In this way, the structure for suppressing resonance during rotation of a hard disk made of rigid material is adopted for a flexible (non-rigid) disk rotation mechanism that is configured to repeat high-speed rotation and stoppage. However, the distortion of the inner periphery of the disk at the time of high-speed rotation, which is a problem of the disk having flexibility, cannot be reduced.

  The object of the present invention is based on the above-mentioned problems, and even when a flexible disk is rotated at a high speed exceeding 10,000 rpm, distortion does not accumulate in the inner peripheral part of the disk, and the surface does not run out for a long time. It is an object of the present invention to provide a disk rotation mechanism, a disk, a recording / reproducing apparatus, and a recording / reproducing method that can be rotationally driven.

In order to solve the above problems, the present inventors have completed the following invention.
The present invention relates to a flexible disc capable of recording information, a turntable for holding the disc, a spindle for rotating the disc together with the turntable, and a stabilizing member for stably rotating the disc. A rotation mechanism for transmitting the rotation of the spindle to the disk via the turntable; and a disk holding mechanism for holding the disk in a radially expandable manner from the center of rotation. A disk rotating mechanism characterized by comprising:

  In a preferred aspect of the present invention, the disk rotating mechanism is characterized in that an elastic body is disposed on a contact surface of the disk with the turntable.

  In a preferred aspect of the present invention, the turntable includes the disk holding portion that holds the disk, and the disk has a plurality of protrusions, and the disk has an opening that fits into the protrusion.

  A preferred aspect of the present invention is the disk rotating mechanism including a clamper that holds the disk opposite to the turntable via the disk.

  In a preferred aspect of the present invention, the turntable includes the disk rotating mechanism including an elastic body on a contact surface with the disk.

  In a preferred aspect of the present invention, the disk is provided with an elastic body on a contact surface with the turntable.

  In a preferred aspect of the present invention, the disc rotation mechanism is characterized in that the clamper includes an elastic body on a contact surface with the disc.

  In a preferred aspect of the present invention, the disc is provided with an elastic body on a contact surface with the clamper.

  The present invention is a disc that is flexible and capable of recording information, and is characterized in that an elastic body is provided on at least one of both surfaces of the holding portion held by the turntable. is there.

  In a preferred aspect of the present invention, the elastic body is made of a cured product of rubber or an adhesive.

  The present invention is a disk that is flexible and can record information, and has a plurality of openings in a holding portion held by a turntable.

  In a preferred aspect of the present invention, the disc is characterized in that the holding portion includes a hub.

  The present invention provides a turntable capable of holding a flexible disk, a spindle for rotating the disk together with the turntable, a stabilizing member for stably rotating the disk, and held on the turntable. A recording / reproducing apparatus comprising a recording / reproducing head for recording / reproducing information on / from the disc, a rotation transmission mechanism for transmitting the rotation of the spindle to the disc via the turntable, and rotating the disc A recording / reproducing apparatus including a disc holding mechanism that holds the disc in a radial direction from the center.

  In a preferred aspect of the present invention, the turntable includes an elastic body on a contact surface with the disk.

  A preferred embodiment of the present invention is the recording / reproducing apparatus comprising a clamper for holding the disk together with the turntable, and the clamper is provided with an elastic body on a contact surface with the disk.

  In a preferred aspect of the present invention, the turntable is provided with a plurality of protrusions in a disk holding portion for holding the disk.

  The present invention provides a turntable capable of holding a disk as a recording medium, a spindle for rotating the disk together with the turntable, a stabilizing member for stably rotating the disk, and information for the disk. A disk arranging step of arranging a flexible disk via an elastic body on the turntable of a recording / reproducing apparatus comprising a recording / reproducing head for recording or reproducing; and a disc arrangement step arranged on the turntable. A recording / reproducing method comprising: a disk rotating step of rotating a flexible disk by the spindle; and a recording / reproducing process for recording or reproducing information on the rotating flexible disk. is there.

  In a preferred aspect of the present invention, the disk placing step includes a step of placing a clamper for holding the disk together with the turntable on the flexible disk placed on the turntable via an elastic body. The recording / reproducing method according to claim 17.

  The present invention provides a turntable capable of holding a disk as a recording medium, a spindle for rotating the disk together with the turntable, a stabilizing member for stably rotating the disk, and information for the disk. A disk disposing step of disposing a flexible disk on the turntable of a recording / reproducing apparatus having a recording / reproducing head for recording or reproducing, and a flexible disk disposed on the turntable. A recording / reproducing method comprising: a disk rotating step for rotating by the spindle; and a recording / reproducing step for recording or reproducing information on the rotating flexible disc. A protrusion on the turntable is fitted into an opening formed in the flexible disk, and the A recording and reproducing method characterized by comprising the step of holding the disk on the turntable having sex.

  According to the present invention, even when a flexible disk is rotated at a high speed exceeding 10000 rpm, distortion can not be accumulated in the inner periphery of the disk, and it can be normally rotated without causing surface runout for a long period of time. A disk rotating mechanism, a disk, a recording / reproducing apparatus, and a recording / reproducing method can be provided.

  The best mode for carrying out the present invention will be described with reference to the drawings as necessary. Note that it is easy for a person skilled in the art to make other embodiments by changing or correcting the present invention within the scope of the claims, and these changes and modifications are included in the scope of the claims. The following description is an example of a preferred embodiment of the present invention, and does not limit the scope of the claims.

  FIG. 1 is a plan view showing a disk rotation mechanism of the present invention. 2 is a cross-sectional view taken along the line CC ′ in FIG. 1 and 2, reference numeral 1 denotes a disk which is a flexible recording medium (in the present invention, the disk is described assuming an optical disk, but is not limited to an optical disk, and is not limited to an optical disk, but a phase change memory, a magneto-optical memory, 1a is a holding unit for holding the disk 1 on a turntable 5 to be described later. Reference numeral 2 is a hub, and 3 is a spindle (may include a spindle motor). Reference numeral 4 denotes recording / reproducing means that moves in the radial direction of the disk 1 to focus the light beam on the disk 1 and performs optical scanning along the flow line R with respect to the disk 1 in order to perform information recording / reproducing processing. It is a certain reproduction processing head (pickup). 5 is a turntable that holds the disk 1 fixed to the rotating shaft of the spindle 3 and transmits the rotation of the spindle 3 to the disk 1, 5 a is a disk holding portion of the turntable, and 6 is the disk 1 on the turntable 5. It is a clamper (disc clamper) for holding. Reference numeral 7 denotes a rubber-like elastic body having an annular thickness defined on both sides of the holding portion 1 a of the disk 1. In this disk rotation mechanism, the turntable 5, the elastic body 7, and the clamper 6 correspond to the rotation transmission mechanism / disk holding mechanism.

  As a form of the stabilizing member 30, as shown in a CC ′ cross-sectional view shown in FIG. 3, a cylindrical concave surface whose surface facing the disk 1 is curved only in the CC ′ direction (lateral direction in the drawing), A reverse cylindrical convex surface may be used. Further, the surface of the stabilizing member 30 facing the disk 1 may be in various forms such as a mortar-shaped concave surface or a mortar-shaped convex surface obtained by reversing the surface.

  A configuration in which the flexible stabilizing member 31 and the disk 1 are coupled as shown in the CC ′ cross-sectional view of FIG. 4 and the disk 1 is stably driven while being rotated together is also an object of the present invention. It is a place to do. In this embodiment, a second flexible stabilizing member 31 is provided in addition to the stabilizing member 30 described above. The second flexible stabilizing member 31 has a plurality of holes 32 on an arbitrary circumference of the inner circumference. The second flexible stabilizing member 31 is connected to the disk 1, and the air flow flowing from the hole 32 effectively acts on the stabilization of the disk 1 while rotating together with the disk 1.

  Further, as shown in a cross-sectional view along CC ′ in FIG. 5, the stabilizing member 30 may be formed of a disk-shaped rigid body, and the stabilizing member 30 and the disk 1 may be rotated together. Also in this embodiment, in a state where the stabilizing member 30 and the disk 1 are connected and rotated together, the air flow introduced from a plurality of holes 32 formed on an arbitrary circumference of the inner peripheral part causes the stability of the disk 1. It is effective for conversion. The stabilizing member is not limited to the above-described form.

  An operation for stably rotating and driving the disk 1 will be described using the disk rotating mechanism shown in FIGS. 1 and 2 as an example. As shown in FIG. 2, the disk 1 is held by a turntable 5 and a clamper 6 via an elastic body 7 and is rotated by a driving force of a spindle 3 that is coaxially coupled to the turntable 5. To do. During rotation, the disk 1 rotates in a substantially horizontal manner along the opposing surface of the stabilizing member 30 without surface runout. For example, in the form shown in FIG. 2, the condition for obtaining a predetermined stabilization state is set between the lower surface of the holding portion 1 a that is the central portion of the disk 1 and the surface near the central portion of the stabilizing member 30. The set value Cbd of the distance in the disc rotation axis direction is set to 0.1 to 0.2 mm. The setting condition of the setting value Cbd varies depending on the structure of the disk 1 and is not limited to this.

  In this disk rotation mechanism, it is necessary to reliably transmit the rotation of the spindle 3 to the disk 1 (the turntable 5 and the disk 1 are appropriately connected by an elastic body), and while realizing this rotation transmission mechanism, the disk 1 One form of the disk holding mechanism that holds the disk 1 in the holding portion 1a so as to allow expansion and contraction is the configuration shown in FIGS.

  The elastic body may be an elastic body that can be deformed by exerting elasticity when the disk and the turntable are displaced in the shearing direction, and can reversibly return to the original state by the elasticity. Examples of the elastic material forming the elastic body include, for example, silicone rubber, fluorine rubber (such as Teflon (registered trademark) rubber), chloroprene rubber, urethane rubber, EPDM (a terpolymer of ethylene propylene diene), and the like. Examples thereof include elastic materials such as cured products of adhesives based on rubber and silicone-modified polymers. When expressed in terms of shear modulus, an elastic material of about 10 to 100 MPa is suitable.

  In a configuration in which this elastic material is actually used as the elastic body 7, it is necessary to secure a deformation amount with respect to the shear stress, and the thickness of the elastic body 7 is required. The thickness of the elastic body is desirably 5 to 300 μm, and preferably 10 to 100 μm. For example, in driving at a high-speed rotation exceeding 20000 rpm, the outer peripheral end (holding portion 1a) of the holding portion 1a on the inner peripheral portion of the disk Therefore, it is preferable that the elastic body has a thickness of at least twice that of 40 μm. is there. Note that the thickness of the elastic body affects the set value Cbd of the disk and the stabilizing member 30 in FIG. 2, for example, and it goes without saying that the thickness management is important. Moreover, it is preferable that the rubber-like elastic bodies disposed on the front and back sides of the disk have the same thickness.

Hereinafter, a typical procedure of the rotational driving operation assuming recording / reproduction by the recording / reproducing apparatus including the disk rotating mechanism having the above-described configuration will be described with reference to FIGS.
(1) The setting value Cbd of the disk 1 and the stabilizing member 30 is set to a preliminary setting value (for example, 2 mm), and the rotation of the disk 1 is accelerated to the preliminary rotation speed (for example, 4000 rpm).
(2) When the rotational speed of the disk 1 reaches the preliminary rotational speed, the set value Cbd is adjusted to a predetermined set value (for example, 0.1 mm).
(3) Accelerate the rotation of the disk 1 to a predetermined rotational speed (for example, 15000 rpm).
(4) Recording or reproduction from the disk 1 is performed by a pickup head (not shown).
(5) When recording or reproduction is completed, the rotational speed of the disk 1 is reduced to a preliminary set value (for example, 4000 rpm).
(6) The stabilizing member 30 is moved away from the disk 1 and set to a preliminary set value (for example, 2 mm).
(7) The spindle 3 is stopped.

  1 and 2, the disk rotating mechanism of the present invention sandwiches the disk 1 between the holding table 1a, which is the inner periphery of the disk 1, by the turntable 5 and the clamp 6 via the elastic body 7. For this reason, when the disk 1 is rotated at a high speed, stress due to centrifugal force is generated in the holding portion 1a of the disk 1. Further, stress due to torsion is also generated in the vicinity of the outer peripheral portion of the holding portion 1a of the disk 1 due to the change in the rotational speed of the disk 1. However, since both sides of the disk 1 are held by the elastic body 7, the stress caused by centrifugal force or twist is dispersed throughout the elastic body 7 and the holding portion 1a. This stress distribution makes it difficult for distortion to occur in the vicinity of the outer peripheral portion of the holding portion 1a of the disk 1, and in the disk rotating mechanism of the present invention, the disk 1 can be repeatedly rotated and stopped at high speed.

  On the other hand, in the conventional disk rotating mechanism as shown in FIG. 18, the holding part 1a of the disk 1 is clamped so that the disk 1 is fixed by a rigid turntable 5 and a clamp 6. In this state, when the high-speed rotation and stop of the disk 1 are repeated similarly to the disk rotation mechanism of the present invention, stress concentrates on the outer peripheral part of the holding part 1a of the disk 1, and only the outer peripheral part of the holding part 1a is centrifuged as described above. It corresponds to the stress that causes force and torsion. As a result, distortion due to centrifugal force or torsional stress is likely to occur in the vicinity of the outer peripheral portion of the holding portion 1a of the disk 1, and the physical properties and shape of the disc 1 near the outer peripheral portion of the holding portion 1a change due to repeated driving stoppage. It will end up. Then, the disk 1 is liable to cause abnormal surface vibration as it rotates. The stabilizing member 30 has a function of suppressing the surface vibration of the disk due to such distortion, but if the high-speed rotation is repeated such that the rotational speed exceeds 10,000 rpm, the disk 1 is effective in the stabilization member 30. It will not withstand use alone.

  The results of experimental confirmation of this phenomenon are shown in FIGS. FIG. 19 shows changes in the gap between the disk and the stabilizing member for each position in the disk radial direction at 4000 rpm in the repeated experiment of high-speed rotation stop of the disk by the conventional disk rotation mechanism shown in FIG. . As can be seen from FIG. 19, the gap is a value (40 to 120 μm) close to the set value of 0.1 mm in the holding portion 1a of the disk 1 at the first repetition over 25 to 58 mm in the radial direction of the disk. The set value Cbd is set at a position in the disk radial direction of 15 mm, which is the position of the holding portion 1a by the turntable 5 of the disk 1. On the other hand, after repeated high-speed rotation stop, the set value Cbd in the holding portion 1a of the disk 1 is set to 0.1 mm. However, at the position of 25 mm in the disk radial direction, the gap is already 0 μm and stabilized with the disk 1. The member 30 has come into contact.

  On the other hand, in the repeated experiment of high-speed rotation stop of the disk by the disk rotation mechanism of the present invention shown in FIGS. 1 and 2, even after the high-speed rotation stop was repeated 100 times and 1000 times, as shown in FIG. At any position in the direction, there was almost no difference from the gap at the time of the first high-speed rotation stop.

  As can be seen from this result, in the holding of the disk by the conventional disk rotating mechanism, the position of the disk radial direction 15 mm which is the outer peripheral part of the holding part 1a by the turntable 5 of the flexible disk by repeated high-speed rotation stop, A large change occurs in the disk shape during rotation between 25 mm in the disk radial direction. On the other hand, the disk rotation mechanism of the present invention hardly changes the disk shape during rotation even when the same operation is repeated. Although not shown in the figure, the same study was performed by arranging an elastic member on one side of the disk 1 and holding the disk 1 by a rigid turntable 5 and clamp 6. A clear gap reduction of about 10% was observed with repeated rotation stops.

  Examples of the disk rotating mechanism of the present invention other than the forms shown in FIGS. 3 to 5 are cross-sectional views of the CC ′ cross-section in FIG. 1 different from those in FIG. The form of the cylindrical curved surface of the stabilizing member 30 of the disk rotation mechanism shown in FIG. 3 has, for example, a flat portion 30a having a width Wcf at the center and a cylindrical curved concave surface 30b on the left and right as shown in FIG. Is forming. In addition, this stabilization member 30 is the same height with respect to the up-down direction of drawing in the front view of Fig.6 (a) so that the front view of FIG.6 (b) may show. In this case, it is preferable to scan the recording / reproducing head 4 (pickup head) slightly upstream of the central bus in the disk rotation direction. Further, the position of the recording / reproducing head 4 can be a point-symmetrical position (on the opposite side of 180 degrees) with respect to the center of rotation of the disk, and two recording / reproducing heads 4 are used for one disk. It is also possible to increase the transfer speed.

  The disc rotating mechanism shown in FIG. 4 includes two types of stabilizing members. This disk rotation mechanism includes a second stabilization member 31 between the normal stabilization member 30 and the disk 1. The second stabilizing member 31 is flexible, and can be composed of, for example, a polymer film such as polycarbonate, polyethylene terephthalate, polyimide, or the like. The thickness necessary for functioning as a flexible stabilizing member is approximately 75 to 300 μm in the case of polycarbonate and approximately 50 to 200 μm in the case of polyethylene terephthalate. Moreover, it is also possible to comprise with metal foil. For example, a stainless steel foil or copper foil having a thickness of about 30 to 100 μm is suitable. The second stabilizing member 31 can be integrated with the disk 1 and stored in the disk cartridge.

  In the form shown in FIG. 5, the stabilizing member 30 is arranged so as to rotate together with the disk 1. It can also be set as the structure of such a stabilization member. As will be described in detail later, in such a disk rotation mechanism, the disk 1 can be integrated with the stabilizing member 30 and stored in a disk cartridge.

  A specific configuration of the disk rotation mechanism of the present invention is shown in FIGS. The first embodiment shown in FIG. 7 includes a disk assembly 8 and a disk drive device 20 that are configured around the disk 1. In the first embodiment, an elastic body 7 is arranged on the surface of the holding portion 1 a of the disk 1 on the turntable 5 side and the disk holding surface of the clamper 6, and the disk 1 is clamped by the elastic body 7 when the disk is clamped to the spindle 3. It is configured to be held from both sides. Here, the form in which the hub 2 is formed on the elastic body 7 provided in the disk 1 is shown. However, for example, a method of bonding the hub 2 as an elastic adhesive that becomes an elastic body after the elastic body 7 is cured is suitable. is there. The hub 2 may be eliminated, and the elastic body 7 and the turntable 5 may be in direct contact with each other.

  If the disk drive device 20 is equipped with a recording / reproducing head, the recording / reproducing device of the present invention is obtained. The recording / reproduction may be information recording or reproduction, or recording and reproduction.

  A second embodiment is shown in FIG. In the second embodiment, the elastic body 7 is provided on the surface of the holding portion 1 a of the disk 1 on the side of the clamper 6 and the disk holding surface 5 a of the turntable 5 so that the disk 1 is elastic when the disk 3 is clamped to the spindle 3. Therefore, it is configured to be held from both sides. Here, the form in which the hub 2 is formed on the elastic body 7 provided in the disk 1 is shown. However, for example, there is a method of bonding the hub 2 as an elastic adhesive that becomes a rubber-like elastic body after the elastic body 7 is cured. Is preferred. It is also possible to eliminate the hub 2 so that the elastic body 7 and the disc clamper 6 are in direct contact with each other.

  A third embodiment is shown in FIG. In the third embodiment, the elastic body 7 is provided on both surfaces of the holding portion 1 a of the disk 1, and the disk 1 is held from both surfaces by the elastic body 7 when the disk is clamped to the spindle 3. Here, the form in which the hub 2 is formed on the elastic body 7 provided in the disk 1 is shown. However, for example, there is a method of bonding the hub 2 as an elastic adhesive that becomes a rubber-like elastic body after the elastic body 7 is cured. Is preferred. It is also possible to eliminate the hub 2 so that the elastic body 7, the turntable 5 and the disc clamper 6 are in direct contact with each other.

  A fourth embodiment is shown in FIG. In the fourth embodiment, a rubber-like elastic body is provided on the disk holding surfaces of the disk clamper 6 and the turntable 5, and the disk 1 is held from both sides by the elastic body 7 when the disk is clamped to the spindle 3. It is.

  Here, the basic description has been given of the mode in which the disk 1 is loaded and driven into the drive device 20 alone. For example, as shown in FIGS. 11 and 12, the disk 1, the elastic body 7, and the clamper 6 are contained in the disk cartridge 11. It is also possible to load and drive the disc assembly 20 in a state where the disc assembly 8 including the disc assembly 8 is housed. In the disk rotating mechanism of the present invention, it is important to hold the disk 1 from both sides by the elastic body 7.

  11 and 12, reference numeral 12 denotes a cartridge Z-axis position positioning mechanism for setting an adjustment value of the relative position Cbd between the spindle 3 and the disk cartridge 11 in the Z-axis direction, and reference numeral 13 denotes a recording / reproducing (pickup head) 4. A recording / reproducing head access opening 14 for accessing the disk 1 is a spindle access opening 14 for connecting the spindle 3 to the disk assembly 8.

  Further, in the disk rotating mechanism described so far, the stabilizing member 30 is disposed at the lower part of the disk. However, the stabilizing member 30 in the disk rotating mechanism of the present invention may be disposed at the upper part of the disk 1 as well. There is an effect. Further, the stabilizing member 30 may be disposed on both sides of the disk 1.

  The clamp 6 is arranged to hold the disk 1 on the turntable 5 and transmit the driving force of the spindle 3 to the disk 1, but the disk 1 can transmit the driving force of the spindle 3. If it can be held on the turntable 5, it is not necessary. For example, a magnetic material may be disposed in a part of the holding part 1a of the disk 1 and a part of the turntable 5 facing the disk holding part 5a so that the disk 1 and the turntable 5 are coupled and held by magnetic force. .

  Next, as a fifth embodiment, an embodiment in which the disk 1 is not fixed and clamped between a turntable and a clamp will be described. As shown in FIG. 13, the hub 2 is disposed on the disk 1, and a center hole 40 and a plurality of openings 41 are formed in the holding portion 1 a of the disk 1. The center hole 40 at the center of rotation is for fitting with the spindle, and there are at least two other openings 41. In the case of the disk 1 shown in FIG. 14, there is no central hole 40 at the center of rotation. In the case of the disk 1 shown in FIG. 15, there is no hub 2, and a configuration in which six circular openings 41 are arranged in two rows concentrically with the disk 1 in the holding portion of the disk 1. Thus, if the shape and arrangement of the opening 41 are devised, the hub 2 is not necessarily required. For example, the structure which arrange | positions the 3-12 circular opening 41 in each row | line | column to the holding | maintenance part of the disc 1 in 1 to 3 rows concentric with the disc 1 can be considered.

  As shown in FIG. 16, a center boss 42 and a plurality of protrusions 43 corresponding to the spindle 3 are formed on the turntable 5. When the disc 1 is held on the turntable 5, the center hole 40 is fitted to the center boss 42 and the plurality of openings 41 are fitted to the plurality of protrusions 43. FIG. 17 shows a state where the disk 1 is held on the turntable 5. In FIG. 17, the clamp 6 is disposed at the top, but this clamp 6 is not in close contact with the disk 1. That is, the disk 1 is sandwiched between the turntable 5 and the clamp 6 but can move slightly in the vertical direction (for example, about 0.1 mm). Further, the clamp 6 may not be provided as long as the disk 1 can be attracted onto the turntable 5 by a magnetic force or the like. When the disk shown in FIG. 14 is used, the turntable 5 may have a form without the center boss 42.

  In the disk rotation mechanism shown in FIG. 17, the disk 1 is held on the turntable in this state without receiving vertical stress from the clamper 6 and the turntable 5. When the turntable 5 is rotated, the rotational driving force is transmitted to the disk 1 through the protrusion 43 of the turntable 5 and the opening 41 of the disk 1, and the disk 1 rotates.

  When the disk 1 is rotated at a high speed in this state, the flexible disk 1 extends in the radial direction due to centrifugal force. The disk 1 includes a holding part 1a for holding the disk 1 with a rigid turntable and a clamper as in a conventional disk rotating mechanism. The pinching stress that occurs when holding is fixed does not act. For this reason, the deformation of the disk 1 can be easily returned to its original state by the elasticity of the disk itself even when the disk 1 is decelerated to a low speed rotation after a high speed rotation. In particular, there is no stress concentration on the outer peripheral portion of the holding portion 1a of the disk 1 due to the rotational acceleration, which occurs when the rotational speed is changed. For this reason, distortion around the outer periphery of the holding portion 1a of the disk 1 is unlikely to occur.

  The opening 41 of the disk 1 in this embodiment is preferably made sufficiently larger than the protrusion 43 (at least a clearance of 20 μm or more). In this way, even when the disk is rotated in the radial direction at the time of high-speed rotation, it is possible to eliminate the problem that the inner peripheral part of the disk is distorted due to the mismatch of these shapes.

  The material of the hub 2 is preferably made of the same material as that of the disk 1 or a material having the same Young's modulus. For example, the disk 1 is made of a polycarbonate resin having a thickness of 0.1 mm, and a hub 2 made of the same polycarbonate resin having a thickness of 1 mm is attached. Further, the same effect can be obtained by a method in which the hub 2 is made of a rigid body such as stainless steel and the rubber-like elastic body employed in the first to fourth embodiments is used between the hub 2 and the disk 1. Furthermore, as already described, if the shape and arrangement of the opening 41 are devised, the hub 2 may not necessarily be essential.

Hereinafter, the disk rotation mechanism, the disk, the recording / reproducing apparatus, and the recording / reproducing method of the present invention will be described more specifically based on examples.
(Example-1)
Example 1 is a disk rotation mechanism having the structure shown in FIG. 8 according to the second embodiment, in which the disk assembly 8 is loaded into the disk drive device 20, and the disk rotation speed and the set value in the pattern shown in Table 1 are used. The test was repeated with one cycle of changing Cbd in 7 steps.

  However, the stabilization member 30 of the disk drive device 20 was formed of a stainless steel material with the surface facing the disk 1 having a curved concave surface as shown in FIG. The specific shape of the stabilizing member 30 was an outer diameter φ130 mm, an inner diameter φ35 mm, a flat portion width Wcf 30 mm near the center bus, and a curvature radius R1000 mm of the cylindrical curved concave surface. On the turntable 5, an annular elastic body 7 made of silicone having a thickness of 0.05 mm was installed.

In the disk assembly 8, a polycarbonate sheet having a diameter of 120 mm and a thickness of 80 μm was used as the base material of the disk 1. First, a groove (thickness 15 μm) having a stamper pitch of 0.6 μm and a width of 0.3 μm is transferred to the sheet by thermal transfer, and then a sheet / Si ₃ N ₄ 10 nm / ZnS—SiO ₂ 25 nm / AgInSbTeGe 10 nm by sputtering. / (ZrO ₂ —Y ₂ O ₃ ) —SiO ₂ 7 nm / Ag reflective layer 120 nm in this order. The information recording area was set in a range from an inner peripheral diameter of 50 mm to an outer peripheral diameter of 116 mm (radius 25 mm to 58 mm). Thereafter, a UV resin was spin-coated and cured by ultraviolet irradiation to form a transparent protective film having a thickness of 10 μm. Further, a hard coat having a thickness of 10 μm was applied to the opposite surface. A hub 2 made of stainless steel foil having an outer diameter of φ29 mm, an inner diameter of φ15 mm, and a thickness of 0.1 mm is provided on one side (the side opposite to the information recording layer forming side) of the center portion of the disc 1 thus manufactured as an elastic adhesive (thickness 0.05 mm). Attached by. This assembly was performed after aligning each member coaxially.

  The disk assembly 8 was disposed in the disk drive device 20 described above, and the disk 1 was held on the turntable 5 and the test was repeated. In the repeated test, the number of revolutions of the spindle 3 (same as the number of revolutions of the disk 1) and the surface of the elastic body 7 on the turntable 5 (corresponding to the surface of the holding part 1a of the disk 1 on the turntable 5 side). The set value Cbd in the disc rotation axis direction between the flat surface portion 30a (Wcf portion) of the stabilizing member 30 is managed according to Table 1 (see FIG. 6). The gap at the position of 36 mm in the radial direction of the disk 1 at a rotational speed of 4000 rpm and a set value Cbd of 0.1 mm when 100 cycles are repeated is the gap at the position of 36 mm in the radial direction of the disk 1 at the rotational speed of 4000 rpm and the set value of Cbd of 0.1 mm in the first cycle. The reduction rate was calculated compared to If the reduction rate is 0%, the disk 1 is not deformed even after the 100-cycle repeated test, and if it is 100%, the disk 1 is in contact with the surface of the stabilizing member 30. The results are shown in Table 2.

(Example-2)
In Example-2, the disk assembly 8 is loaded onto the drive device 20 by the disk rotation mechanism of the third embodiment shown in FIG. 9, and the number of disk rotations in the pattern shown in Table 1 is the same as in Example-1. The operation of changing the set value Cbd was repeated 100 cycles. The same stabilizing member 30 as in Example-1 was used.

  The disk assembly 8 was prepared by the following procedure. A disk 1 having the same configuration as in Example-1 was used. A stainless steel foil hub 2 having an outer diameter of φ29 mm, an inner diameter of φ15 mm, and a thickness of 0.1 mm was attached to both surfaces of the central portion of the disk 1 with an elastic adhesive (thickness 0.05 mm) serving as an elastic body 7. This assembly was performed after aligning each member coaxially. In the disk drive device 20, the elastic body 7 is not disposed on the turntable 5. The repeated rotation test was performed in the same manner as in Example-1. The results are shown in Table 2.

(Example-3)
In Example-3, the disk assembly 8 was loaded onto the drive device 20 in the configuration shown in the fourth embodiment of FIG. The same stabilizing member 30 as in Example-1 was used. An annular elastic body 7 made of silicone having a thickness of 0.20 mm was installed on the upper surface of the turntable 5 and the lower surface of the disk clamper 6. Further, the disk 1 of Example 1 was used for the disk assembly 8 without the elastic body 7 disposed. The repeated test was carried out in the same manner as in Example-1 using the disk rotation mechanism described above. The results are shown in Table 2.

(Example-4)
In Example-4, the disk 1 of the form shown in FIG. 13 is used in FIG. 17 by using the turntable 5 of the form shown in FIG. 16 based on the disk drive device 20 shown in the third embodiment of FIG. The disk was rotated in the holding state shown, and the operation of changing the number of rotations of the disk and the set value Cbd with the pattern shown in Table 1 was repeated as in Example-1.

  The same stabilizing member 30 as in Example-1 was used. A disk 1 having the same material structure as that of Example-1 was used. A polycarbonate hub 2 having an outer diameter of φ29 mm, an inner diameter of φ15 mm, and a thickness of 1 mm is attached to one side of the center portion of the disk 1. Three pieces were formed so as to be point-symmetric from the center. The assembly of the disk 1 was performed after aligning the respective members coaxially. In the rotational drive, the height of the rotation transmission projection 43 corresponding to the opening 41 was 1.15 mm, and the disc assembly 8 was set on the turntable 5 with the clamper 6 abutting against the height. A disc assembly 8 having a total thickness of 1.10 mm is set between 1.15 mm sandwiched between the turntable 5 and the clamper 6, and a gap of 0.05 mm is formed in the rotation axis direction. The repeated test was carried out in the same manner as in Example-1 using the disk rotation mechanism described above. The results are shown in Table 2.

(Comparative Example-1)
In Comparative Example-1, with the configuration shown in FIG. 18, the operation of changing the disk rotational speed and the Cbd set value with the pattern shown in Table 1 was repeated.

  The same stabilizing member 30 as in Example-1 was used. The turntable 5 and the clamper 6 were made of stainless steel. The disk 1 was the same as in Example-1. The repeated test was carried out in the same manner as in Example-1 using the disk rotation mechanism described above. The results are shown in Table 2.

(Comparative Example-2)
In Comparative Example-2, the same structure as shown in Example-1 was used as the stabilizing member 30 in the configuration shown in FIG. 18, and the turntable 5 and the clamper 6 were made of stainless steel. The disk 1 was the same as in Example-1.

  Using the disk rotation mechanism described above, the test was repeated under the same conditions as in Example 1 except that the rotation speed of Step 4 of the pattern shown in Table 1 was changed from 15000 rpm to 10000 rpm. The results are shown in Table 2.

(Comparative Example-3)
In Comparative Example-3, the hub 2 and the elastic body 7 provided in the disc assembly 8 are excluded from the configuration of the embodiment-1 (the configuration in which the elastic body 7 is disposed only on the lower surface of the disc 1). ), Repeated tests were performed under the same conditions as in Example-1. The results are shown in Table 2.

  In Comparative Example-1, after the drive was repeated 100 times, the disk 1 contacted and slid against the stabilizing member 30 and the spindle stopped. This phenomenon is caused by the distortion accumulated and increased in the inner peripheral portion of the disk 1 through repeated operations, and is caused by the proximity of the disk 1 and the stabilizing member 30 under low-speed rotation conditions. This proximity situation is represented as a gap between the stabilizing member and the disk in FIG. In the initial drive, it can be clearly confirmed that the disk that has been driven with a certain gap approaches the stabilizing member after repeated operations and is in contact at two places near the disk radius of 25 mm and 52 mm. This is the result at a disc rotational speed of 4000 rpm.

  For example, in Example-3, the result shown in FIG. 20 was obtained. Even when the number of repetitions was 1000, the proximity of the disk after the number of repetitions to the stabilizing member as seen in Comparative Example-1 was not observed, and stable driving was realized throughout the repetition.

  18 and 20, Table 2 shows the reduction rate of the gap after 100 repetitive operations at the disk radial position of 36 m. This index indicates that the disk 1 and the stabilizing member 30 can be driven stably without contact in repeated operations. The smaller this value, the better.

  In Examples 1 to 4 to which the present invention was applied, good results with a reduction rate of less than 5% were obtained in any case. On the other hand, in Comparative Example-1, the reduction rate was as high as 53%, which clearly showed the malfunction of the disk rotation mechanism shown in FIG.

  In Comparative Example-3, although it is clear that the rubber-like elastic body is arranged on one side of the disk, the improvement (53% → 21%) is improved, but the reduction rate is ignored. The size was not possible. This configuration is limited to use when the number of repetitive operations is small, and was judged to be less practical.

  Comparative example-2 is an example in which the number of disk revolutions is limited to 10000 rpm or less, and the reduction rate remains at a relatively low value of 10%. However, it was not at a level that could withstand practical use. This indicates that the above-described problem is a phenomenon that is unique to the number of revolutions exceeding 10,000 rpm, which has not been targeted in the conventional discs, and is based on the inventions shown in Patent Documents 4 and 5. It shows that it is a completely new problem that has newly emerged.

  As described above, in the present embodiment and the present example, even in a system in which a flexible disk is rotationally driven by air stabilization using a stabilizing member, the disk is rotated even when the disk is rotationally driven at a high speed exceeding 10,000 rpm. It is possible to provide a disk rotation mechanism, a disk, a recording / reproducing apparatus, and a recording / reproducing method that do not cause distortion in the inner peripheral portion and do not damage the disk on which information is recorded due to the occurrence of the distortion.

  The present invention is applied to a recording / reproducing apparatus, a disc assembly, and a disc cartridge for performing recording and / or reproducing processing on a flexible disc. The disc to which the present invention is applied includes a phase change memory, an optical disc, and an optical disc. This is intended for all disk-type recording disks such as magnetic memory and hologram memory.

Plan view of the disk rotation mechanism of the present invention Sectional view (1) of CC 'section of the disk rotation mechanism in FIG. Sectional view (2) of CC 'section of the disk rotation mechanism in FIG. Sectional view (3) of CC 'section of the disk rotation mechanism in FIG. Sectional view (4) of CC 'section of the disk rotation mechanism in FIG. The top view (a) and front view (b) of the disk rotation mechanism of this invention FIG. 1 is an exploded sectional view (1) taken along the line CC ′ of the disk rotation mechanism in FIG. FIG. 1 is an exploded cross-sectional view of the CC ′ cross section of the disk rotation mechanism in FIG. FIG. 3 is an exploded sectional view (3) of the CC ′ section of the disk rotation mechanism in FIG. FIG. 4 is an exploded sectional view (4) of the CC ′ section of the disk rotating mechanism in FIG. Exploded sectional view of the disk system Disc cartridge Plan view of the disc of the present invention (1) Plan view of the disc of the present invention (2) Plan view of the disc of the present invention (3) Relationship diagram between the disk holding part of the turntable and the disk holding part Sectional view (5) of CC 'section of the disk rotation mechanism in FIG. Sectional view of a conventional disk rotation mechanism Relationship between radial position of disk and gap (1) Relationship between radial position of disk and gap (2)

Explanation of symbols

1: Disk 1a: Holding part 2: Hub 3: Spindle (spindle)
4: Recording / reproducing head 5: Turntable 5a: Disc holding unit 6: Clamper (disc clamper)
7: Elastic body 8: Disk assembly 11: Disk cartridge 12: Disk cartridge positioning mechanism 13: Recording / reproducing head access opening 14: Spindle access opening 20: Disk drive device 30: Stabilizing member (stabilizer)
30a: Flat portion 30b: Cylindrical curved concave surface 30c: Central bus 31: Second stabilizing member 31: Hole 40: Center hole 41: Opening 42: Center boss 43: Projection

Claims (19)

A flexible disc capable of recording information;
A turntable for holding the disc;
A spindle that rotates the disk with the turntable;
A disk rotation mechanism comprising a stabilizing member for stably rotating the disk,
A rotation transmission mechanism for transmitting rotation of the spindle to the disk via the turntable;
A disk rotation mechanism comprising: a disk holding mechanism that holds the disk so as to be expandable and contractable in a radial direction from the rotation center.   2. The disk rotating mechanism according to claim 1, wherein an elastic body is disposed on a contact surface of the disk with the turntable.   3. The disk rotation mechanism according to claim 1, wherein the turntable includes a plurality of protrusions in a disk holding portion that holds the disk, and the disk has an opening that fits into the protrusion. 4.   The disk rotation mechanism according to any one of claims 1 to 3, further comprising a clamper that clamps the disk opposite to the turntable via the disk.   The disk turn mechanism according to claim 1, wherein the turntable includes an elastic body on a contact surface with the disk.   The disk rotation mechanism according to claim 1, wherein the disk includes an elastic body on a contact surface with the turntable.   The disk rotation mechanism according to any one of claims 4 to 6, wherein the clamper includes an elastic body on a contact surface with the disk.   The disk rotation mechanism according to claim 4, wherein the disk includes an elastic body on a contact surface with the clamper.   A disc having flexibility and capable of recording information, wherein the disc is provided with an elastic body on at least one of both surfaces of a holding portion held by a turntable.   The disk according to claim 9, wherein the elastic body is made of a cured product of rubber or an adhesive.   A disc having flexibility and capable of recording information, the disc having a plurality of openings in a holding portion held by a turntable.   The disk according to claim 9, wherein the holding portion includes a hub. A turntable capable of holding a flexible disk, a spindle for rotating the disk together with the turntable, a stabilizing member for stably rotating the disk, and a disk held on the turntable A recording / reproducing apparatus comprising a recording / reproducing head for recording or reproducing information,
A recording / reproducing apparatus comprising: a rotation transmission mechanism that transmits the rotation of the spindle to the disk via the turntable; and a disk holding mechanism that holds the disk in a radially expandable manner from the center of rotation.   14. The recording / reproducing apparatus according to claim 13, wherein the turntable includes an elastic body on a contact surface with the disk.   15. The recording / reproducing apparatus according to claim 13, further comprising a clamper that holds the disk together with the turntable, and the clamper includes an elastic body on a contact surface with the disk.   The recording / reproducing apparatus according to claim 13, wherein the turntable includes a plurality of protrusions in a disk holding portion that holds the disk. A turntable capable of holding a disc as a recording medium, a spindle for rotating the disc together with the turntable, a stabilizing member for stably rotating the disc, and recording or reproducing information on the disc A disk arranging step of arranging a flexible disk via an elastic body on the turntable of a recording / reproducing apparatus comprising a recording / reproducing head;
A disk rotating step of rotating a flexible disk disposed on the turntable by the spindle;
A recording / reproducing method comprising: a recording / reproducing step of recording or reproducing information on the rotating flexible disk.   The disk placement step includes a step of placing a clamper that holds the disk together with the turntable on an elastic disk disposed on the turntable via an elastic body. The recording / reproducing method according to claim 17. A turntable capable of holding a disc as a recording medium, a spindle for rotating the disc together with the turntable, a stabilizing member for stably rotating the disc, and recording or reproducing information on the disc A disk arranging step of arranging a flexible disk on the turntable of a recording / reproducing apparatus comprising a recording / reproducing head;
A disk rotating step of rotating a flexible disk disposed on the turntable by the spindle;
A recording / reproducing method comprising a recording / reproducing step of recording or reproducing information on the rotating flexible disk,
The disk placement step includes a step of fitting a protrusion on the turntable into an opening formed in the flexible disk to hold the flexible disk on the turntable. A characteristic recording / reproducing method.

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