JP2001052425A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent correcting balls from a positional deviation and to stabilize the rotation of a disk by preparing a mechanism restraining the movement of unbalance correcting balls of the disk in a correcting position. SOLUTION: This device is provided with the ball moving control mechanism 10 including a restraint board 20 wherein a braking part 20a is brought into contact with balls 19 by force of a spring 21 to restrain the movement of the balls 19 and a restraint board driving means 11 consisting of a driving yoke 23, a coil 24 or the like. When a calmper begins to rotate, a magnetic board 22 is attracted by a magnetic field of the coil 24, the restraint board 20 is lifted and the braking part 20a is separated from the balls 19. When the rotation of the clamper reaches the prescribed number of rotation, the balls 19 are subjected to the centrifugal force, are moved to an outer peripheral part of a space 18 and are held in the position where the unbalance of the disk is corrected. The power source of the coil 24 is turned off to lower the restraint board 20, and data are recorded or reproduced in a state that the braking part 20a is brought into contact with the balls 19 and the movement of the balls is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and more particularly to an automatic disk unbalance correction mechanism in a disk drive.

[0002]

2. Description of the Related Art In recent years, in a disk device for recording / reproducing data, a high-speed rotation of a disk has been advanced in order to improve a data transfer speed. However, some discs have an unbalanced mass due to uneven thickness or the like. When such a disk is rotated at a high speed, a centrifugal force (unbalance force) biased with respect to the center of rotation of the disk acts, and there is a problem that vibrations due to the unbalance force are transmitted to the entire apparatus. Since the magnitude of the imbalance force increases in proportion to the square of the rotation frequency, the vibration rapidly increases as the rotational speed of the disk increases.

Accordingly, when the disk is rotated at a high speed, noise is generated by the vibration, the bearing of a spindle motor for rotating the disk is damaged, and stable recording and reproduction cannot be performed. Was.
Further, when the disk device is incorporated in a computer or the like, there is a problem that vibrations are transmitted to other peripheral devices and adversely affect the peripheral devices. Therefore, in order to improve the data transfer speed by increasing the rotation speed of the disk, it is necessary to suppress undesired vibration due to the imbalance of the disk.

Therefore, as a device for automatically correcting the imbalance of a disk, a disk using a ball-type balancer disclosed in Japanese Patent Application Laid-Open Nos. 10-83622 and 10-92094 has been used. An apparatus is described.

[0005]

However, in a conventional disk drive using a balancer of the type using a ball, a radial position of a disk on which data is recorded or reproduced suddenly changes, that is, at the time of so-called random access. Due to fluctuations in the rotation of the disk, the position of the ball whose disk imbalance has been corrected may shift. As a result, the unbalance mass of the rotating system increases, and the generated vibration increases, which hinders writing or reading of information.

Accordingly, an object of the present invention is to provide a disk device equipped with a mechanism in which the position of the ball of the balancer once corrected does not shift even if the rotational speed of the disk changes.

[0007]

In order to achieve the above object, a disk 1 and a turntable 3 attached to a spindle center shaft 5 for rotating the disk 1 are provided.
A disk clamper 4 for clamping the disk 1 on the turntable 3;
A disc provided with a balancer 9 for correcting imbalance of the disc, a pickup 6 for writing information on or reading information from the disc 1, and a means 7 for moving the pickup 6 in the track direction. In the apparatus, the balancer 9 has an annular space 18 formed coaxially with the spindle center axis 5.
And the ball 1 movably accommodated in the space 18
9 is provided, and the ball 19 is
8 can be moved from a predetermined position in the disk 8 to a position for correcting the imbalance of the disk, and the ball 19 can be moved in the predetermined position and the position for correcting the unbalance.
A disk device provided with mechanisms 10 and 11 for restraining the movement of the disk drive.

The period during which the ball 19 is movable is a period from when the disk 1 starts to rotate until the rotation of the disk 1 exceeds a predetermined number of rotations, and a period during which the disk 1 rotates. There is provided a disk device characterized in that when stopping the disk device, the period is from when the number of rotations becomes equal to or less than a predetermined number of rotations to when the rotation of the disk 1 stops.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a disk drive according to the present invention will be described with reference to the drawings. FIG. 1 is a side view showing one embodiment of a disk drive according to the present invention. FIG. 1 shows a state in which the disk is rotatable by clamping the disk. Only the main mechanical components of a device for writing or reading information are shown, and a disk mounting mechanism, an electric circuit component, an exterior Parts and the like are omitted.

The disk drive according to the present invention is provided with a ball movement stopping mechanism 10 and a stopping board driving means 11 for stopping and moving the ball. Disk 1 is
The disk is clamped between a turntable 3 fixed to the shaft end of a spindle motor 2 and a disk clamper 4 and rotates about a spindle central shaft 5. The pickup 6 can be moved in the radial direction of the disk 1 by the pickup moving means 7, and can write information on the disk 1 or read information from the disk 1. And
Pickup moving means 7 and spindle motor 2
Is attached to the base plate 8. Further, the balancer 9 is integrated with the disc clamper 4 and rotates integrally with the clamped disc 1.

The ball movement restricting mechanism 10 is integrated into the clamper 4 and the balancer 9 and controls the movement of the ball.
1 is held by a holding portion 12 of a stopping plate driving means fixed to a top plate 13 of the apparatus, and is disposed so as to face the ball movement stopping mechanism 10, and the ball movement stopping mechanism 10 and the stopping plate driving means 11 There is a small gap between them.

FIG. 2 shows a ball movement restricting mechanism 1 integrally incorporated in the balancer 9 of the disk drive according to the present invention.
FIG. 4 is an enlarged view of a main part showing details of a stop plate driving means 11 arranged with a small gap between the details of the block No. 0 and a ball movement restraining mechanism 10.

The clamper 4 is composed of a guide pin 14, a housing 15, a magnet 16, and a back yoke 17.
And a turntable 3. At the outer periphery of the magnet 16 and the back yoke 17,
A plurality of balls 19 for correcting imbalance of the disc 1 are mounted in a space 18 inside the housing 15.

In the disk device shown in this embodiment, the rotation of the clamper 4 is stopped or in a low rotation state, and the ball 19 is attracted to the magnet 16 and located at the innermost peripheral portion of the space 18. are doing. Further, a braking portion 20a which is a part of the stop plate 20 and is in contact with the ball 19 is provided with a spring 21.
The movement of the ball 19 is stopped by contacting the ball 19 with the force of. In addition, the center hole of the stop board 20 is guided with a gap from the guide pin 14 and can move up and down.

The position of the spring 21 is regulated by a flange 14a integrally formed with the guide pin 14. The magnetic plate 22 is located on the opposite side of the stop plate 20 across the flange 14a.
Are arranged, and the stop plate 20 and the magnetic plate 22 are
a through the plurality of holes 14b provided in the
Are integrated by a plurality of bosses 20b which are projections.

The restraining plate driving means 11 comprises a driving yoke 23, a coil 24, and a coil holder 25. The driving yoke 23 is arranged to face the magnetic plate 22 with a gap 26 therebetween.

The details of the ball movement restraining mechanism 10 integrally incorporated in the balancer 9 and the detailed parts of the stop board driving means 11 arranged with a small gap between the ball movement restraining mechanism 10 are described above. Configuration. Next, the operation of these components will be described.

When the clamper 4 starts rotating, a voltage is applied to the coil 24 to generate a magnetic field.
The magnetic field guided through the magnetic disk attracts the magnetic disk 22. When the magnetic disk 22 is attracted, the integrated stopping disk 20 is
1 is lifted in opposition to
Move away from At this time, the stop board 20 is
The magnetic disk 22 does not come into contact with the drive yoke 23, so that the magnetic disk 22 does not contact the drive yoke 23. It does not hinder rotation. When the rotation of the clamper 4 gradually increases and reaches a predetermined number of revolutions, centrifugal force acts on the ball 19, the ball 19 moves away from the magnet 16 to the outer peripheral portion of the space 18, and the position at which the imbalance of the disk 1 is corrected. Stay in. When the rotation speed of the clamper 4 reaches a specified rotation speed, the coil 2
The voltage applied to 4 is turned off, and the stopping plate 20 is lowered by the force of the spring 21 so that the braking portion 20a contacts the ball 19 and stops the movement of the ball 19 remaining at the position where the imbalance is corrected. As described above, data recording or reproduction is performed in a state where the movement of the ball 19 remaining at the position where the imbalance is corrected is stopped.

When recording or reproduction of information is completed, the disc 1
When the rotation of the disk 1 is stopped, a voltage is applied to the coil 24 at the time when the number of rotations reaches a predetermined low value to release the restraint of the ball 19, the rotation of the disk 1 is stopped, and the ball 19 is attracted to the magnet 16. At the time of staying at the innermost circumference of the space 18, the voltage applied to the coil 24 is cut off, and the ball 19
Stop moving.

Although the specific embodiment of the present invention has been described with reference to FIGS. 1 and 2 as an example in which the balancer is incorporated in a clamper which is clamped from the upper surface of the disk, the balancer may be a turntable or a spindle motor. Needless to say, the present invention is effective even when incorporated in a part.

[0021]

As described above in detail, according to the disk device of the present invention, the operation of writing information on a disk,
Or, when reading information from the disc, the ball does not move even if the rotation speed of the disc changes, so the balance may be lost while writing or reading information. It does not collapse and increases the generated vibration or prevents an error from occurring in the information writing or reading operation due to the increase in the generated vibration, and has the effect of enabling stable writing or reading of information. It is.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a disk drive according to the present invention.

FIG. 2 is an enlarged sectional view of a main part showing one embodiment of a disk drive according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2 Spindle motor 3 Turntable 4 Disc clamper 5 Spindle center axis 6 Pickup 7 Pickup moving means 8 Base plate 9 Balancer 10 Ball movement stopping mechanism 11 Stopper driving means 12 Holding part of stopping board driving means 13 Top plate 14 Guide Pin 14a Flange 14b Hole 15 Housing 16 Magnet 17 Back Yoke 18 Space 19 Ball 20 Stopper 20a Braking Unit 20b Boss 21 Spring 22 Magnetic Plate 23 Drive Yoke 24 Coil 25 Coil Holder 26, 27 Void

Claims (2)

[Claims] 1. A disk, a turntable mounted on a spindle central axis for rotating the disk, a disk clamper for clamping the disk on the turntable, and for correcting imbalance of the disk A balancer, a pickup for writing information to the disk or reading information from the disk, and a unit for moving the pickup in a track direction, wherein the balancer includes: An annular space formed coaxially and a ball movably accommodated in the space are provided, and the ball is moved from a predetermined position in the space to a position to correct the imbalance of the disk. With the predetermined position and the A disk device provided with a mechanism for stopping the movement of the ball at a position where the balance is corrected. 2. A period during which the ball is movable includes a period from when the disk starts rotating to a time when the rotation of the disk becomes equal to or higher than a predetermined number of rotations, and a period when the rotation of the disk is stopped. 2. The disk device according to claim 1, wherein the period is from when the number of rotations becomes equal to or less than a predetermined number of times to when the rotation of the disk stops.