JPH10255390A - Disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high reliability even at the time of high speed rotation by cancelling centrifugal force to be generate by eccentric mass at the time of rotating the disk. SOLUTION: A holding member 5 to be rotated at the same time as a clamper 3 for fixing the disk 6 is provided with an inner circumferential wall and an outer circumferential wall, and moreover, a ring 7 is arranged between the two walls, and an elastic body 9 for energizing the ring 7 in order to position a rotary center axis of the holding member 5 and a rotary center axis 2a' of the ring 7 and a spindle of a disk motor on the same axis at the time of stopping rotation of the disk 6, and moreover a member capable of energizing the ring 7 from the inner circumference to the outer circumference is arranged. Then, an inner circumferential wall and an outer circumferential wall are provided in a turntable 1, and moreover, the ring 7 is arranged between the two walls, and an elastic body for energizing the ring 7 is arranged in order to position the spindle of the disk motor an the rotary center axis of the ring 7 approximately on the same axis at the time of stopping the rotation of the disk 6, and moreover a member capable of energizing the ring 7 from the inner circumference to the outer circumference is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive in an information processing apparatus for performing recording and / or reproduction using a disk-shaped medium such as an optical disk or a magnetic disk, and particularly to a case where the disk is rotated at a high speed. The present invention relates to a disk drive device suitable for improving the stability and reliability of the device.

[0002]

2. Description of the Related Art In recent years, a recording and / or reproducing apparatus using a disk-shaped medium (hereinafter, referred to as a disk) such as an optical disk or a magnetic disk has been increased in capacity and recording density with the spread of personal computers. It is rapidly developing due to the increase in access speed and data transfer rate. Under such circumstances, for example, CD-ROM
Taking the device as an example, in order to increase the data transfer rate, in order to realize a further high-speed access, the data transfer rate is twice, four times, and eight times the normal rate (sustain transfer rate of 150 kBytes / sec). 12x speed, 16x speed,
Super high speeds such as 20 times speed and 24 times speed are progressing.

[0003] Ideally, a disc which does not cause imbalance when rotated is ideally used. However, in reality, the imbalance in mass generated during disc molding or the imbalance in mass due to printing on the label surface, that is, the eccentric mass is somewhat reduced. It happens at all costs. When the disk rotates, a centrifugal force is generated by the eccentric mass, which causes vibration in a device for driving the disk. Since this centrifugal force increases in proportion to the square of the number of rotations, the speed is 8 ×, 12 ×, 16 ×, etc.
・ Accelerately increases as Also, with the high-speed rotation of the disk, the vibration generated in the device also increases sharply.

[0004] Here, for example, Japanese Patent Application Laid-Open No. 2-139758.
Although the method using the eccentric mass canceling mechanism as described in (1) is conceivable, when the fluid is used for canceling the centrifugal force, at high speed rotation, the fluid sticks to the outer wall surface that encapsulates the liquid layer and is canceled. The effect is not obtained enough,
There is a problem. As another method, there is a method using a plurality of spheres. However, there is a problem in that the spheres react sensitively to disturbance, collide with each other, and go out of control.

Although these methods are effective for horizontally placing the apparatus, in the case of vertical installation, when a fluid or a sphere is used, gravity acts on the fluid or the sphere when the disc is stopped, and the disc is rotated in this state. However, it is difficult to cancel the centrifugal force.

Therefore, as the disk speed increases, the entire apparatus vibrates greatly, and at the same time, the pickup that controls the exchange of signals from the disk fluctuates, so that the exchange of signals tends to become unstable. Therefore, there is a problem that a collision occurs in a gap between members constituting the device, and not only vibration but also loud noise is generated.

[0007]

As described above, in the conventional disk driving method, since vibration occurs due to the eccentric mass when the disk rotates, the reliability of reading and writing of signals from the disk, noise, and the like are reduced. It was also the cause of the decline.

[0008] An object of the present invention is to solve the above-mentioned problems by using a disk having an eccentric mass as well as a disk having no eccentric mass regardless of the direction in which the apparatus is placed. However, it is an object of the present invention to provide a highly reliable disk drive at low cost even during high-speed rotation by canceling centrifugal force generated by eccentric mass during disk rotation.

[0009]

In order to solve the above-mentioned problems, the present invention provides an inner peripheral wall and an outer peripheral wall on a holding member which rotates simultaneously with a clamper for fixing a disk, and further comprises a ring-shaped member between the two walls. (Hereinafter referred to as a ring), and an elastic body for urging the ring such that the spindle of the disk motor and the rotation center axis of the ring are positioned substantially on the same axis when the rotation of the disk is stopped. Further, a member capable of urging the ring from the inner circumference to the outer circumference is arranged.

Further, an inner peripheral wall and an outer peripheral wall are provided in the turntable, and a ring is disposed between the two walls. When the rotation of the disk is stopped, the spindle of the disk motor and the rotation center axis of the ring are substantially coaxial. , An elastic body for urging the ring is arranged, and a member capable of urging the ring from the inner periphery to the outer periphery is arranged.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described as an example.
A case where the present invention is applied to a D-ROM drive device will be described.

First, FIGS. 1, 2 and 3 are explanatory views showing an embodiment of the present invention.

FIG. 1A is a top view showing a holding member and a ring of the present invention when the disk motor is stopped, and FIG. 1B is a holding member and a ring of the present invention and a disk drive. FIG. 3 is a cross-sectional side view showing a main part of FIG.

In FIG. 1, 1 is a turntable, 1a is a magnet formed in the turntable 1, 2 is a disk motor for rotating the turntable, 2a is a spindle (rotary shaft) of the disk motor, 2a 'Is a rotation center axis of the spindle, and 2b is a rotor of the disk motor. 6 is a disk, 3 is a disk 6 and a turntable 1
Is a clamper that is sandwiched and fixed between the magnet 1a and the magnet 1a.
And is integrally formed with the iron plate 4 which is adsorbed to the surface. Further, the inner wall 5 is fitted with the outer peripheral portion of the clamper 3 and rotates integrally.
a, a holding member 5 having an outer wall 5b, and a ring 7, which is disposed between the inner and outer walls of the holding member 5 and acts as a weight for canceling the centrifugal force due to the eccentric mass, and 9 and 10, respectively, when the disk rotation is stopped. An elastic body for urging the ring 7 from the outer peripheral direction so that the rotation center axis of the ring 7 coincides with the rotation center axis 2a 'of the spindle of the disk motor, and a guide shaft for urging the ring 7. The ring 7 is a member capable of urging the ring 7 by centrifugal force generated when the disk motor rotates from the inner circumferential direction. In the present embodiment, an example using a shaft-shaped member will be described.

Reference numerals 15, 16, 17 and 18 denote ring-shaped lids for preventing the shaft-shaped member 11 from coming off the ring 5.

Here, in the present embodiment, as an example, the elastic body 9 and the guide shaft 10 are arranged at intervals of approximately 120 ° on the circumference.
A description will be given of a case where members 11 capable of urging the ring 7 from the inner periphery are attached to six locations at approximately 60 ° intervals.

In this embodiment, the elastic member 9 will be described as an elastic member having the same rigidity in order to simplify the device configuration, and for simplicity, the member 11 will be the same member. Subsequently, the operation of the present invention will be described in detail.

FIGS. 1A, 2 and 3 show the principle of the present invention, in which the disk 6 and the clamper 3 are omitted. Further, the numbers of the respective constituent elements are based on the description of FIG. 1 described above, and the description is omitted.

FIG. 1A shows a state in which the rotation of a disk (not shown) is stopped. At this time, since no centrifugal force is generated in the member 11, a force for urging the ring 7 from the inner peripheral side is generated. I haven't. However, since the ring 7 is urged by the elastic body 9 and the guide shaft 10 from the outer peripheral direction, the rotation center axis O2 of the ring 7 and the rotation center axis O1 of the holding member substantially coincide with each other. At this time, needless to say, the rotation center axis O1 of the holding member and the rotation center axis 2a 'of the spindle of the disk motor substantially coincide with each other.

Also, even when the apparatus is placed vertically, the rotation center axis O2 of the ring 7, the rotation center axis O1 of the holding member, and the spindle The rotation center axis 2a 'has a structure that is substantially coincident.

FIG. 2 shows a case where the disc motor has no eccentric mass and the disc motor is rotating, the centrifugal force acts uniformly on the holding member 5 and the ring 7, and the disc is rotating stably.

At this time, the disk motor starts rotating with the rotation center axis O2 of the ring 7 substantially coincident with the rotation center axis O1 of the holding member in the state of FIG. The position does not change relative to the rotation center axis O2 and the rotation center axis O1 of the holding member 5. here,
With the rotation of the disk motor, a centrifugal force also acts on the elastic body 9 and the guide shaft 10, and the urging force acting on the ring 7 from the outer peripheral direction decreases. At the same time, the ring 11
Since the centrifugal force starts to act equally from the inner circumference to the outer circumference, the rotation center axis O2 of the ring 7 and the rotation center axis O1 of the holding member 5 still substantially coincide with each other regardless of the rotation speed of the disk motor, and are not shown. The disk can maintain a stable rotation.

Needless to say, at this time, as shown in FIG. 2, the whirling center axis O of the disk motor, that is, the rotation center axis 2a 'of the spindle, and the rotation center axis O of the holding member 5
1. The rotation center axis O2 of the ring 7 is on the same rotation axis.

On the other hand, FIG. 3 shows that the disk has an eccentric mass,
During high-speed rotation, the disk motor (not shown) integrated with the disk whirls due to the centrifugal force f1 due to the eccentric mass in the disk (not shown), and the whirling rotation center axis O
The figure shows a case where the rotation center axis O1 of the disk and the holding member 5 (not shown), that is, the rotation center axis 2a 'of the spindle is rotating and shifted. At this time, the rotation center axis O2 of the ring 7 moves in the direction opposite to the centrifugal force f1, that is, in the direction of the original rotation center axis O, and rotates the disk.

As a result, the centrifugal force f1 generated by the eccentric mass of the disk (not shown) acts in the direction in which the centrifugal force f2 generated in the ring 7 cancels, and the mass of the second ring is set so as to meet the purpose. For example, the centrifugal force due to the eccentric mass can be reduced or completely canceled.

Furthermore, according to the embodiment of the present invention, when the disk motor rotates, the centrifugal force is applied to the elastic body 9 and the guide shaft 10.
Therefore, the force for urging the ring 7 from the outer periphery can be reduced or eliminated, and the ring 7 has a feature that it is hardly affected by the elastic body 9 and the guide shaft 10.

In this state, when the rotation of the disk motor stops, the restoring force of the elastic body 9 acts again, and the guide shaft 1
0, the ring 7 is urged from the outer peripheral direction of the ring.
Return to the state of (a).

Subsequently, even if the disk having no eccentric mass is placed on the turntable again from the rotation stop state,
Alternatively, even if a disk having an eccentric mass is placed, once the disk motor starts rotating, as described above, if the disk has no eccentric mass, as shown in FIG. Since the ring 7 acts to cancel the eccentric mass as shown in FIG. 3, it is possible to rotate the disk stably regardless of the rotation speed of the disk motor and the attitude of the apparatus.

In this embodiment, as an example, the ring 7
Guide shaft for urging the elastic member from the outer peripheral direction,
Although the description has been given of the case where the members that can be biased from the inner circumferential direction are disposed at six positions at approximately 60 ° intervals, the members are arranged at three positions at three positions, and the members are independently arranged at two or more integer N positions. An interval of 360 ° / N is also possible.

These inventions can be extended to a second embodiment as shown in FIG.

Here, FIG. 4A is a top view showing the present invention, and FIG. 4B is a side view showing a cross section of FIG. 4A.

Each symbol is the same as that described with reference to FIG.

FIG. 4 has the same basic structure as that of the first embodiment, but a continuous elastic body 19, for example, a rubber or sponge having elasticity is used as a holding member instead of the independent elastic body 9 in FIG. 5 is an example of the arrangement. The operation and effect are the same as in the first embodiment.

According to the embodiment of the present invention described above, when the rotation of the disk motor is stopped, as shown in FIG. 2, the rotation center axis of the ring 7, the rotation center axis of the disk motor (not shown), and the holding member 5 is substantially co-linear with the center axis of rotation of the disk 5, so that the ring 7 does not behave unstablely when the disk motor starts rotating, and stable disk rotation can be realized. According to the present invention, the guide shaft 10 and the elastic body 9 make the center axis of rotation of the ring 7 substantially coincide with the center axis of rotation of the holding member 5 when the disk motor stops rotating. With this structure, it is possible to combine the features that the stability of the device does not change when the device is placed vertically and horizontally.

Further, since the components of the present invention can be realized with a small number of points, there is an advantage that the cost of the apparatus can be reduced.

As described above, the embodiment of the present invention is
Although the description has been given of the case where the present invention is applied to a CD-ROM drive, the application of the present invention is not limited to this. For example, a DVD or the like that requires high-speed access, or a recordable and / or reproducible CR that requires higher reliability. -R drive,
Alternatively, the present invention can be widely applied to a disk drive in an information processing apparatus using a disk such as a DVD-RAM.

In addition to the two embodiments described above, the present invention may be applied to a turntable, and in this case, the same effects as those of the invention described above can be obtained.

[0038]

By providing the inner and outer walls on the holding member integrated with the clamper for fixing the disk and arranging the ring therebetween, the centrifugal force in the disk surface direction caused by the eccentricity of the center of rotation is canceled.

Further, when the rotation of the disk motor is stopped, the ring disposed between the inner and outer walls of the holding member is positioned coaxially with the rotation center axis of the holding member and the spindle of the disk motor by the elastic member and the guide shaft. By arranging a member that can urge the ring from the inner circumference when the disk motor rotates,
In addition to rotating a disk having no eccentric mass, it is possible to realize a stable high-speed rotation of the disk regardless of the attitude of the apparatus.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Turntable 2 ... Disk motor 2a ... Disk motor spindle (rotation axis) 2a '... Spindle rotation center axis 2b ... Disk motor rotor part 3 ... Clamper 5 ... Holding member 6 ... Disk 7 ... Ring 9 ... Elastic body 10 ... Guide shaft 11: Shaft-shaped member 15, 16, 17, 18 ... Ring-shaped lid 19 ... Elastic body

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yuji Kishi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Multimedia System Development Division, Hitachi, Ltd.

Claims (2)

[Claims] 1. A turntable on which a disk-shaped medium for recording and / or reproduction is placed, a disk motor having a spindle mounted with the turntable, and a disk-shaped medium facing the turntable. A clamper arranged and fixed to the disk-shaped medium, and
A disk drive device comprising a holding member which is integral with the clamper and is rotatable, comprising a ring-shaped member movably held by the holding member, wherein the ring is provided when the rotation of the disk-shaped medium is stopped. The center axis of rotation of the disk-shaped member is urged by an elastic body and arranged on substantially the same axis as the spindle of the disk motor, and when the disk rotates, the ring-shaped member is biased from the inner circumferential direction by centrifugal force. A disk drive device having a structure including a member capable of being biased. 2. A disk drive device comprising: a turntable on which a disk-shaped medium for recording and / or reproduction is placed; and a disk motor having a spindle on which the turntable is mounted. A ring-shaped member that is movably held, and when the rotation of the disk-shaped medium is stopped,
The center axis of rotation of the ring-shaped member is urged by an elastic body and disposed on substantially the same axis as the spindle of the disk motor, and when the disk rotates, the ring-shaped member is moved in the inner circumferential direction by centrifugal force. A member that can be biased from
A disk drive device characterized by having a structure including: