JP2001176158A - Disk-like recording medium drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk-like recording medium drive which can perform the recording/reproducing operations with high accuracy even on a curved disk without using a tilt mechanism. SOLUTION: A clamper 2 includes a center clamper 2a which holds a disk 0 via a turntable 1 and a large clamper 2b which touches the outer circumference of the disk 0 and presses this disk when it has a curve. Thus, the curve of the disk 0 is corrected by pressure so that the angle formed between a light beam L and the information surface of the disk 0 can be kept within a fixed range and the disk 0 can be reproduced with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped recording medium (hereinafter simply abbreviated as "disk") such as an optical disk (CD, DVD, etc.) or a magneto-optical disk for recording or reproducing information. The present invention relates to a disk-shaped recording medium driving device that emits a beam.

[0002]

2. Description of the Related Art In recent years, discs such as CDs and DVDs have attracted attention as information recording media, and high-density, large-capacity discs have been developed, and due to their low production costs, they are about to be produced worldwide. Various disc-shaped recording medium drive devices for recording or reproducing information by rotating such a disc have been proposed.

A conventional disk-shaped recording medium drive will be described below.

FIG. 9 is a schematic diagram showing the configuration of a conventional disk-shaped recording medium drive. As is well known, in FIG. 9, the disk 0 is fixed by placing its central portion 0a on a turntable 101 and sandwiching it by a clamper 102 having the same diameter as the turntable 101. In this case, the turntable 101 and the clamper 10
As a main method of sandwiching and fixing by two, there are the following methods.

[0005] One is that a clamper 102 is rotatable on a disk cover of a portable device housing like a so-called portable CD machine, and the clamper 102 is moved by the closure of the disk cover and pressed against the turntable 101 to press the disk. Is fixed.

[0006] The other is a common form of a so-called tray-type stationary machine.
1 is moved to the turntable 101.
Is moved and lifted from the tray, and the rotatable clamper 1
02 to fix the disk 0.

[0007] The other is a so-called slot-in type which is often used for CD players such as car stereos, and is a well-known disk inserted into a slot (a narrow slot) by a user. Is moved onto the turntable 101 by a rubber-like roller or the like, and then the turntable 101 or the rotatable clamper 102 moves to hold the disc 0.

In this case, as is well known, a taper portion (not shown) is provided on the disk mounting surface of the turntable 101 as a means for centering the disk. Is centered and sandwiched.

Now, as described above, the disc-shaped recording medium driving device in which the disc 0 is sandwiched between the turntable 101 and the clamper 102 is driven by the rotation of the turntable 101.
The disk 0 is also rotated, and a light beam L is emitted from the pickup 103 moving in the radial direction of the disk 0 (the direction of arrow R in the drawing). Information is recorded on the disc 0 by the light beam L thus irradiated, or the disc 0
The information recorded on the disk 0 is reproduced by the reflection from.

At this time, in order to record or reproduce information at a high density, it is necessary to accurately irradiate the disk 0 with a light beam and to receive the reflected light beam with high accuracy. More specifically, the angle between the surface of the disk and the light beam must be strictly controlled, along with the focus control of the light beam for focusing the light beam on the information surface on the inner surface of the disk.

For this reason, as shown in the schematic side view of FIG. 10, the conventional disk-shaped recording medium driving device is designed so that recording and reproduction can be performed even on a warped, bent or bent disk. In some cases, so-called tilt control is performed in which the pickup 103 that irradiates the light beam is tilted as shown by an arrow C in FIG. .

[0012]

However, in the above-mentioned conventional configuration, a pickup for irradiating a light beam accurately on a track of a disk and irradiating the track with a light beam to accurately follow the track has a high precision in a radial direction of the disk. Along with the moving mechanism, a tilt mechanism that tilts the pickup by following the warpage of the disk must be provided, and the conventional disk-shaped recording medium drive has the problem that the mechanism is complicated and it is difficult to reduce the size. Was.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a disk-shaped recording medium driving device capable of accurately recording and reproducing even a warped disk without a tilt mechanism. And

[0014]

In order to achieve this object, a disk-shaped recording medium driving device according to the present invention comprises: And a large clamper (or large turntable section) that holds the center clamper (or central turntable section) with the turntable (or clamper) and the outer periphery of the disc-shaped recording medium.

With this configuration, the warped disk-shaped recording medium is brought into contact with and pressed against the vicinity of the outer periphery where no information is recorded, thereby correcting the warpage and irradiating the information recording surface of the disc with the information recording / reproducing information. The disc-shaped recording medium driving device can be obtained in which the angle with the light beam to be controlled is kept within a certain value, and the information can be read accurately and recorded / reproduced with high accuracy.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a disk-shaped recording medium in which a disk-shaped recording medium mounted on a turntable that is driven to rotate is clamped by a rotatably supported clamper. A medium driving device, wherein the clamper includes a central clamper for holding the inner edge of the disc-shaped recording medium near the turntable together with the turntable, and a large clamper for contacting the outer periphery of the disc-shaped recording medium. By pressing the disc-shaped recording medium warped to the clamper side near the outer periphery where no information is recorded and pressing it, the warpage is corrected,
The angle between the information recording surface of the disc and the light beam irradiated for recording and reproducing information is kept within a certain value, so that information can be read accurately and recorded and reproduced with high accuracy. In particular, in claim 2, a pressing means for pressing the clamper against the turntable, a surface vibration amount detecting means for detecting the surface vibration amount of the placed disk-shaped recording medium, and a surface vibration amount detection result of the surface vibration amount detecting means Control means for instructing the pressing means to increase the pressing force by means of the pressing means, when the surface runout is larger than a prescribed value, the pressing means increases the pressing force so that the pressing force is further corrected. Even more stable reproduction is possible.

[0017] The invention according to claim 3 similarly provides:
The turntable is characterized in that it has a central turntable section that clamps the vicinity of the inner edge of the disc-shaped recording medium together with the clamper, and a large turntable section that contacts the outer periphery of the disc-shaped recording medium. By pressing the disc-shaped recording medium warped to the side near the outer periphery where no information is recorded, the warpage is corrected, and the information recording surface of the disc and the light beam irradiated for recording / reproducing the information are formed. The angle is kept within a certain value, so that the information can be read accurately, and the information can be recorded and reproduced with high accuracy. In particular, the invention according to claim 3 is characterized in that the turntable is provided with spokes for supporting the large turntable section from the central turntable section, and a light beam for reading optical information on the disc is provided. The optical information can be prevented from being irradiated at all, and the optical information can be read even partially. In particular, in claim 4, a pickup for irradiating a light beam to a disc-shaped recording medium, a pickup control means for controlling the pickup,
Turntable rotation means for controlling the rotation of the turntable and outputting a rotation position signal indicating the position of the rotation, and inputting the rotation position signal of the turntable to interrupt the focus control of the pickup to the pickup control means from the rotation phase. Command means, and the turntable is provided with spokes that support the large turntable from the central turntable. That can be reproduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 schematically shows the configuration of a disc-shaped recording medium driving apparatus according to Embodiment 1 of the present invention. FIG. 1 (a) is a perspective view showing the configuration of a clamper (described later).
(B) is a partial cross-sectional side view. In FIG. 1, reference numeral 2 denotes a clamper, which is a central clamper portion 2a for fixing the vicinity of the inner edge of the disc 0 together with the turntable 1, and a disc 0.
And a large clamper portion 2b having substantially the same diameter as the outer periphery vicinity 0b and having substantially the same height as the central clamper portion 2a.
Between the central clamper portion 2a and the large clamper portion 2b of the clamper 2, a concave portion 2c is formed over the entire circumference so as not to contact the disk 0. Other than that, the turntable 1 for rotating the disk 0 by its own rotation, and the pickup 3 for irradiating the disk 0 with the light beam L are the same as the conventional ones.

The operation of the disk-shaped recording medium driving device configured as described above will be described with reference to FIG. 2 which is a schematic side step view (the hatching notation showing a cross section is omitted). As in the conventional case, the disk 0 is placed on the turntable 1 and then the clamper 2 is mounted. At this time, the center clamper portion 2a of the clamper 2 is fixed together with the turntable 1 with the vicinity of the inner edge 0a of the disk 0 interposed therebetween, and the large clamper portion 2b contacts the outer edge of the disk 0.

As shown in FIG. 2, when the outer edge of the disk 0 is warped in a direction opposite to the surface irradiated with the light beam (so-called label surface direction) (FIG. 2A). As shown in (b), the outer periphery of the disk 0 is the clamper 2.
After being attached to the large clamper section 2b, the central clamper 2a
Presses the disk 0 to clamp it on the turntable 1. The outer edge portion 0 of the disk 0 warped by this holding
Since b is pressed in the direction opposite to the original warp, the warp is corrected. In some cases, as shown in FIG. 3C, the middle diameter portion (that is, a portion sandwiched between the inner edge portion 0a and the outer edge portion 0b) 0c of the disk may remain warped in the original warping direction. However, even in such a case, since the portion facing the middle diameter portion 0c is the concave portion 2c of the clamper 2, the disk 0 does not contact the concave portion 2c of the clamper 2.

Even if the disk 0 is warped in the direction of the label surface as described above, the warp can be reduced by mounting the clamper 2 having the large clamper 2b, and the angle between the light beam of the pickup 3 and the disk surface can be reduced. The recording / reproducing can be performed with high accuracy even with a pickup having a tilt function within the regulated value.

We have conducted experiments of this embodiment and verified this effect. FIG. 3 shows the results of the experiment. FIG.
(A) shows that the height position of the center clamper and the large clamper of the clamper are substantially the same, and (b) shows the warpage of the disk although the height of the large clamper is higher than that of the central clamper. The horizontal axis is the radial distance from the center of the disc,
The vertical axis indicates the magnitude of the warpage. In both figures, the warpage is corrected for the state where there is no pressing by the large clamper shown by the broken line, and the warp is within the regulation value range.
It can be seen that the warp is smaller when the large clamper protrudes from the central clamper (b).

As described above, according to the present embodiment, by providing the clamper for pressing the outer periphery of the disk from the label surface, it is possible to reduce the warpage of the disk and perform stable reproduction driving.

(Embodiment 2) Next, Embodiment 2 of a disk-shaped recording medium driving apparatus to which Embodiment 1 described above is applied.
Will be described with reference to the block diagram shown in FIG. FIG.
In the above, the turntable 1, the clamper 2, and the pickup 3 are the same as those in the first embodiment described above, the disc 0 is held by the turntable 1, the clamper 2, and the light beam L is emitted from the pickup 3. . Reference numeral 4 denotes pick control means for controlling the pickup 3, which controls the movement of the pickup in the track direction (so-called track jump), tracking and focus. Reference numeral 5 denotes a pick reading means for demodulating optical information of the disc 0 detected by the pickup 3. Reference numeral 6 denotes a turntable rotating means for rotating the held disc 0 by rotating the turntable 1 based on a command from a control means 8 described later. Reference numeral 7 denotes a pressing means which presses the clamper 2 against the turntable 1 and changes the pressing force for pressing the clamper 2 against the turntable 1 in response to a command from the control means while holding the clamper 2 rotatably. Reference numeral 8 denotes a control unit, which includes a pick control unit 4, a turntable rotating unit 6, and a pressing unit 7.
In particular, the output signal of the pick reading means is input, the amount of surface deflection of the disc 0 is detected from the signal, and the pressing means 7 is instructed to control the pressing amount accordingly.

The operation of the disc-shaped recording medium driving device thus configured according to the second embodiment will be described below.
FIG. 5 is a flowchart showing the operation. 4 and 5, when the disc 0 is first placed on the turntable 1 and held by the clamper 2, the control means 8 issues a command to the turntable rotating means 6 to rotate the turntable 1. Next, the pickup 3 detects the index data on the inner peripheral side as conventionally performed (TO of the CD).
C information, detection of DVD lead-in information)
The optical disk is moved to the outer peripheral side of the disk 0 by the pickup control means 4 (Step S1 in FIG. 5), and the outer peripheral side is irradiated with a light beam (S2). By inputting the output from the pick reading means 5 by irradiating the outer peripheral side with the light beam, the control means 8 detects the amount of jitter, thereby detecting the amount of surface deflection on the outer peripheral side of the disk 0 (S3). Then, the magnitude of the surface runout is determined with respect to a predetermined value (S4). If the surface runout is larger than the predetermined value, the pressing means 7 is instructed to increase the pressing force so as to reduce the surface runout. (S5). When the amount of surface runout decreases, the control means 8 instructs the pick control means to move the pickup to the inner circumference side (S6).
A normal reproduction operation is performed (S7).

In the above-described embodiment, the case where the amount of surface deflection is detected from the jitter caused by the output from the pickup 3 has been described. For example, the focus control of the pickup 3 by the pick control means 4 is performed. May be detected from the control signal.

As the pressing means 7, the screw is rotated with a large torque by the rotation of the motor and a torque transmitting means such as a gear train, so that the rack on the clamper side engages with the screw and presses it, and the rotation direction of the motor is changed. There is a method in which the pressure is increased or reduced by the pressure. Further, as another means, a permanent magnet is disposed on the rotating clamper side, and a stator coil serving as an electromagnet is disposed on the fixed device side, and the current flowing through the stator coil is increased or decreased to move the clamper side permanent magnet. It can also be pressed.

As described above, according to the present embodiment, it is possible to detect the warpage of the disk from the surface runout due to its rotation, and to increase or decrease the pressing force of the clamper based on the detected warpage, thereby achieving a more stable reproduction drive. Can be.

(Embodiment 3) FIG. 6 is a schematic perspective view of a disk-shaped recording medium driving apparatus according to Embodiment 3 of the present invention, and FIG. 7 is a schematic side and step view (similar to FIG. (Abbreviated)
It is. In FIG. 6, reference numeral 11 denotes a turntable, which has a central turntable portion 11a having a diameter similar to that of the turntable 1 as described in the first embodiment, and a concentric circle having a diameter substantially equal to the outer diameter of the disk. And a large table portion 11b having a width of about 2 mm and a plurality of branch spokes 11c formed radially from the central turntable portion 11a to support the large table portion 11b. The disk mounting surfaces of the central turntable portion 11a and the large turntable portion 11b are almost the same height, and the spoke 1
1c is configured at a position deeper than each of the mounting surfaces described above. Reference numeral 12 denotes a clamper having substantially the same diameter as the central turntable 11a as described in the background art. The central turntable 11a and the clamper 12 clamp and hold the disk 0.

The operation of the disk-shaped recording medium driving device configured as described above will be described with reference to FIGS. As with the first embodiment, the turntable 11
The disc 0 is placed on top, and then the clamper 12 is mounted. At this time, the central turntable portion 11a of the turntable 11 is fixed together with the clamper 12 with the vicinity of the inner edge 0a of the disk 0 interposed therebetween, and the large turntable portion 11b contacts the outer edge of the disk 0.

As shown in FIG. 7, when the outer edge of the disk 0 is warped in the direction of the surface irradiated with the light beam (the direction opposite to the so-called label surface) (FIG. 7A). As shown in (b), after the outer peripheral portion 0b of the disk 0 abuts on the large turntable portion 11b of the turntable 11, the clamper 12 presses the disk 0 and fixes the disk 0 between the central turntable 11a. The outer edge portion 0b of the disk 0 that is warped due to the nipping is pressed in a direction opposite to the original warp, so that the warp is corrected. Normally, as shown in FIG. 3C, the medium diameter portion (that is, 0a near the inner edge portion)
And a portion between the outer edge portion 0b and the outer edge portion 0b) slightly warps while maintaining the original inclination.
(C) Even if it warps in the opposite direction, the part facing the middle diameter part 0c is the spoke 11c of the turntable 11,
The disk 0 does not contact the spokes 11c of the turntable 11.

The light beam may not be irradiated on the disk 0 by the spokes 11c and its optical information may not be detected. However, in the case of reproduction of a CD, DVD, or the like, the pickup detects the information on the disk. When the optical information is later demodulated into video / audio information or digital information, it is a well-known matter that an error correction function works and a partial loss of optical information is corrected. There is no problem even if the disk surface to be covered is about 1/3 of the maximum circumference.

Further, since the inner periphery of the large turntable 11b is formed outside the outermost periphery of the information recording portion of the disk 0, the read information may be lost due to the large turntable 11b formed on the entire periphery. In particular, important lead-in information recorded on the outermost track of a DVD disc (as well known, such as index information is also recorded on the innermost track. Similarly, important information (Such as TOC information recorded on the innermost track of a CD).

As described above, even when the warp of the disk 0 occurs in the direction of the light beam irradiation surface, the large turntable 1
The warp can be reduced by the turntable 11 having 1b, the angle between the light beam of the pickup 3 and the disk surface falls within the above-mentioned regulation value, and accurate recording / reproduction can be performed even with a pickup having no tilt function. .

As described above, according to the present embodiment, even if the disk is along the light beam irradiation surface, the large turntable that presses the outer periphery of the disk to correct the warp is provided, so that the warp is controlled to the regulation value. It is possible to reduce surface run-out by holding it down inside, and to enable stable reading.

(Embodiment 4) Next, Embodiment 4 of a disk-shaped recording medium driving apparatus to which Embodiment 3 described above is applied.
Will be described with reference to the block diagram shown in FIG. FIG.
In the above, the turntable 11, the clamper 12, and the pickup 13 are the same as those in the above-described third embodiment, the disc 0 is held between the turntable 11, the clamper 12, and the light beam L is emitted from the pickup 13. . Reference numeral 14 denotes pick control means for controlling the pickup 13, which controls movement of the pickup in the track direction (so-called track jump), tracking, and focus. Reference numeral 15 denotes pick reading means for demodulating the optical information of the disc 0 detected by the pickup 13. Reference numeral 16 denotes turntable rotating means, which is a turntable 11 based on a command from a control means 18 described later.
Is rotated to rotate the pinched disc 0. Reference numeral 17 denotes a pressing means for holding the clamper 12 rotatably and pressing the clamper 12 against the turntable 11. Numeral 18 denotes a control means for controlling the pick control means 14 and the turntable rotating means 16. In particular, the position control of the pick control means 14, especially the focus control, is temporarily performed by a rotation position signal output from the turntable rotating means 16. And the operation of the pick reading means 15 is temporarily stopped.

The operation of the disc-shaped recording medium driving device thus configured according to the second embodiment will be described below.
In FIG. 8, the disc 0 is rotated by the rotation of the turntable 11, but the spokes 11c of the turntable 11 block the light beam L, and the focus control of the pickup 13 is disturbed each time. However, the turntable rotating means 1 for rotating the turntable 11
Since the rotational phase of the spoke 11c can be determined from the rotational position signal representing the rotational position of the turntable output from the control unit 6, the control means 8 determines based on the rotational phase of the spoke 11c before and after the spoke 11c crosses the light beam L. During this time, the control unit 14 instructs the pick control unit 14 to release the focus control and hold the focus position immediately before the focus control. Further, the spoke 11c is provided to the pick reading means 15 by the light beam L.
Is controlled to ignore the pickup output while crossing.

As described above, according to the present embodiment, even if the disk is warped toward the light beam irradiation surface, the warp is corrected by the large turntable and the spoke supporting the large turntable is used. In this case, the light beam is interrupted by detecting the rotation phase of the turntable, thereby providing an effect that stable focus control can be performed.

In the above description, in the first embodiment, the large clamper 2 for preventing a disk warped in the label surface direction is used.
The large turntable 11 for preventing a disk warped in the direction of the light beam irradiation surface in the third embodiment.
Although each of the turntables 11 having b has been described in detail, it goes without saying that both may be combined. In this case, even if both the large turntable and the large clamper are configured to protrude from the central turntable and the central turntable, respectively, the amount of protrusion is absorbed by bending the spokes of the turntable. The clamping of the disk by the clamper does not become loose. Similarly, it goes without saying that Embodiment 2 and Embodiment 4 may be combined.

In both embodiments, the light beam irradiation surface is mounted on the turntable and the light beam is irradiated from a certain direction of the turntable. The above-described embodiment has the opposite configuration even if the surface (so-called label surface) is placed on a turntable and clamped from above by a clamper, and a light beam is irradiated from a certain direction of the clamper. If the clamper is provided with a central clamper, a large clamper, and spokes supporting the large clamper, the same effect can be obtained. Furthermore, in correspondence with a disk such as a double-sided playback DVD in which a light beam is irradiated from both sides, a turntable for mounting and rotating the disk and a clamper for holding the disk are each provided with a large turn by a spoke. If the table section and the large clamper are supported, it is needless to say that light beams can be irradiated from both sides for reproduction without reversing the double-sided disc.

In both of the embodiments, the outer circumference of the disk is pressed over the entire circumference to reduce the warpage, so that not only the disk whose surface is warped only at one portion but also the disk whose outer circumference is wavy Needless to say, it is also effective for

Further, as is well known, a disc such as a CD having a diameter of 12 cm (abbreviated as 12 cm CD)
Some devices can be driven (that is, reproduced) by the same device, both of which have a diameter of 8 cm (abbreviated as 8 cm CD).
According to the present embodiment corresponding to 2 cm CD, 8 cm
In addition to the fact that the CD can be driven normally because of the small diameter of the CD, normal driving can be performed, and even if an 8 cm CD is placed, the outer periphery of the CD faces the recess 2c of the clamper 2 and the spoke 11c of the turntable 11, so there is no problem. And both disks can be driven by the same device.

It goes without saying that the clamper and the turntable which come into contact with the disk may be provided with a flexible member such as felt or rubber. In particular, in the case of a disk-shaped recording medium drive with a speaker, that is, a so-called CD radio-cassette-like form, the influence of air vibration from the speaker on the disk can be reduced by increasing the diameter of the clamper or turntable to the disk diameter. The frequency can be reduced, the resonance frequency can be lowered, and larger air vibration can be tolerated. Therefore, a high-output speaker can be provided.

In the embodiment, the material is not described for both the clamper and the turntable.
Alternatively, it is made of a metal such as aluminum, BsBM, or Sus. In particular, by forming the clamper at the upper part of the disk with metal, unnecessary radiation of switching noise due to the pickup and the traverse mechanism for moving the pickup radially across the disk can be suppressed. Further, although the three spokes of the turntable are illustrated in the third embodiment, the spokes are not necessarily limited to the three spokes. If not, there is no problem. Of course, if the spokes are not configured at approximately equal angles,
It goes without saying that vibrations and the like due to high-speed rotation may occur.

As is well known, the turntable is often rotated by a direct drive type brushless motor, but is not limited to this, and is not necessarily limited to this. It may be through a mechanism or may be rotated by a normal brushed DC motor.

[0047]

As described above, according to the present invention, a warped disk-shaped recording medium is brought into contact with and pressed against the vicinity of the outer periphery where no information is recorded, whereby the warp is corrected and the information recording surface of the disk is corrected. An excellent effect is obtained in that the angle between the light beam and the light beam irradiated for recording and reproducing information is kept within a certain value, and the information can be read accurately and recorded and reproduced with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a disc-shaped recording medium driving device according to a first embodiment of the present invention.

FIG. 2 is a schematic side and cross-sectional view for explaining the operation.

FIG. 3 is an explanatory diagram of the result of correcting the warpage of the disk.

FIG. 4 is a block diagram illustrating a configuration of a disk-shaped recording medium driving device according to a second embodiment of the present invention.

FIG. 5 is a flowchart for explaining the operation.

FIG. 6 is a schematic perspective view of a disk-shaped recording medium driving device according to a third embodiment of the present invention.

FIG. 7 is a schematic side and sectional view for explaining the operation.

FIG. 8 is a block diagram illustrating a configuration of a disk-shaped recording medium driving device according to a fourth embodiment of the present invention.

FIG. 9 is a schematic diagram of a configuration of a conventional disk-shaped recording medium driving device.

FIG. 10 is a schematic plan view on which a warped disk is placed.

[Description of Signs] 0 Disc 1, 11 Turntable 11a Central turntable 11b Large turntable 11c Spoke 2, 12 Clamper 2a Central clamper 2b Large clamper 2c Recess 3 Pickup 4, 14 Pick control means 5, 15 Pick reading means 6, 16 Turntable rotating means 7, 17 Pressing means 8, 18 Control means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuhiko Koshino 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Kiyoshi Ishioka 1006 Odaka Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. 72) Inventor Masanori Onishi 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F term (reference) 5D038 CA35 CA37 HA10

Claims (4)

[Claims] 1. A disk-shaped recording medium driving device for holding a disk-shaped recording medium mounted on a rotatable turntable with a rotatably supported clamper, and wherein said clamper includes said disk A disk-shaped recording medium driving device, comprising: a central clamper for holding the vicinity of an inner edge of the disk-shaped recording medium together with the turntable; and a large clamper for contacting the outer periphery of the disk-shaped recording medium. 2. A pressing means for pressing a clamper against a turntable, a surface vibration amount detecting means for detecting a surface vibration amount of a placed disk-shaped recording medium, and a surface vibration amount detection result of the surface vibration amount detecting means. 2. The disk-shaped recording medium drive according to claim 1, further comprising control means for instructing the pressing means to increase the pressing force. 3. A disk-shaped recording medium driving device for holding a disk-shaped recording medium mounted on a turntable that is driven to rotate with a clamper rotatably supported, wherein the turntable includes the disk. A central turntable section for holding the vicinity of the inner edge of the disk-shaped recording medium together with the clamper, a large turntable section for contacting the outer periphery of the disk-shaped recording medium,
And a spoke supporting the large turntable portion from the central turntable portion. 4. A pickup for irradiating a disk-shaped recording medium with a light beam, a pickup control means for controlling the pickup, and a turntable rotation for controlling the rotation of the turntable and outputting a rotation position signal indicating the position of the rotation. Means, and control means for inputting the rotation position signal of the turntable and instructing the pickup control means to interrupt the focus control of the pickup from the rotation phase, and the turntable is provided from the central turntable section. 4. The disk-shaped recording medium driving device according to claim 3, further comprising a spoke for supporting the large turntable portion.