JP2004213812A - Disk chucking mechanism and motor with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress variation in centering accuracy at the time of disk chucking. <P>SOLUTION: In a disk chucking mechanism that can hold a recording disk D, the central hole of which is fitted to a disk centering part 24 of a turntable 16 on the turntable 16 in a freely mountable and detachable way by engaging a plurality of chucking pawls 34 with the circumferential part of the central hole of the recording disk D, a chucking pawl part 38 formed by connecting the three chucking pawls 34 to one ring member 36 through a coil spring 32 is provided in the disk centering part 24. Force generated at the time of disk chucking is evenly dispersed in such a manner that the ring member 36 formed by an elastic member deforms. This prevents centering deviation and suppresses variation in centering accuracy each time the recording disk D is clamped. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk chucking mechanism for detachably holding a recording disk in order to rotate a removable recording disk such as a CD-ROM and a DVD, and a motor including the disk chucking mechanism.
[0002]
[Prior art]
2. Description of the Related Art In general, in a disk drive device that accesses a recording disk such as a CD-ROM or a DVD and reads / writes data, it is necessary to maintain a high positional relationship between the recording disk and a pickup that reads / writes data. If a displacement occurs between the rotating recording disk and the pickup, it becomes difficult to read / write data, and, for example, the reproduced music or video is deteriorated.
[0003]
Since these recording disks are generally formed of a synthetic resin, the inner diameter of the center hole of the recording disk provided for mounting on the turntable of the disk drive tends to vary, and depending on the degree of the error, The recording disk is not mounted on the turntable with good concentricity, and a displacement occurs between the rotating recording disk and the pickup.
[0004]
Therefore, conventionally, a disk drive mechanism is provided with a disk alignment mechanism, the recording disk mounted on the turntable is aligned (centered) and arranged at a correct position, and the position between the rotating recording disk and the pickup is adjusted. The displacement was suppressed.
[0005]
Such a conventional disk alignment mechanism includes an annular alignment portion in a plan view on a turntable fixed to a shaft orthogonally to the shaft, and the alignment portion has a plurality of alignment nails at the upper end of the outer periphery thereof. A centering claw portion is provided, and the centering claw portion can swing toward the shaft side by elastic deformation of a spring, so that the centering claw portion can be pressed against the peripheral portion of the center hole of the recording disk. When the recording disk is mounted on the turntable in this way, even if there is a slight variation in the inner diameter of the center hole of the recording disk, the variation is absorbed by the swing of the alignment claw, and the recording disk is adjusted. Cored and securely mounted on turntable. (For example, see Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-237118
[Problems to be solved by the invention]
However, when the biasing force of each of the plurality of centering claw portions is not constant, the centering claw portion of the conventional disk centering mechanism can fix the recording disk to the turntable, but the centering misalignment is not possible. And the alignment accuracy varies each time the recording disk is fixed. If the centering accuracy of the recording disk is reduced, the center of gravity of the turntable and the disk will be eccentrically located with respect to the rotation axis, causing whirling, an increase in abnormal vibration and noise, or data reading / writing errors. I do. Further, at the time of high-speed rotation, the disk drive device and the recording disk may be damaged due to the scattering (separation) of the recording disk.
[0008]
The present invention has been made in view of the above problems, and prevents alignment deviation, suppresses variation in alignment accuracy that occurs each time a recording disk is chucked, increases whirling, abnormal vibration / noise, or reduces data. An object of the present invention is to provide a disk chucking mechanism for preventing a disk drive device and a recording disk from being damaged due to occurrence of a read / write error and scattering (separation) of a recording disk, and a motor having the disk chucking mechanism.
[0009]
[Means for Solving the Problems]
The disc chucking mechanism according to claim 1, wherein a turntable on which a recording disc having a center hole is removably mounted is disposed integrally and concentrically at the center of the turntable, and A substantially cylindrical disk alignment portion into which the center hole is inserted, and a radially outwardly projecting outer peripheral surface of the disk alignment portion that resiliently engages with the peripheral edge of the central hole of the recording disk. In a disc chucking mechanism having a plurality of alignment pawls biased by independent springs, an end of the spring opposite to the alignment pawl is connected by a ring member, and The member, the spring, and the alignment claw form an alignment claw portion for aligning and holding the recording disk on the turntable. By connecting a plurality of claw members by one ring member, a force generated during disc chucking is evenly dispersed, alignment misalignment is prevented, and variation in alignment accuracy occurs each time a recording disk is chucked. To prevent whirling, abnormal vibration / noise, data reading / writing errors, and damage to the disk drive and recording disk due to disk scattering (disconnection) during high-speed rotation. Can be prevented.
[0010]
According to a second aspect of the present invention, in the disk chucking mechanism according to the first aspect, since the ring member is formed of an elastic member, the ring member is plastically deformed by an uneven force generated at the time of disk chucking. , Which can more effectively prevent misalignment and reduce the variation in alignment accuracy that occurs each time the recording disc is chucked, increasing whirling, abnormal vibration / noise or data In addition, it is possible to prevent the occurrence of read / write errors and prevent the disk drive device and the recording disk from being damaged due to the scattering (separation) of the disk during high-speed rotation.
[0011]
In the motor according to the third aspect, the disc chucking mechanism according to the first or second aspect can prevent misalignment and can suppress variation in alignment accuracy that occurs each time a recording disk is chucked. In addition, it is possible to prevent the occurrence of whirling, abnormal vibration and noise, or the occurrence of data reading / writing errors, and to prevent damage to the disk drive device and the recording disk due to the scattering (separation) of the disk when the motor rotates at high speed.
[0012]
Furthermore, the motor according to claim 3 including the disk chucking mechanism according to claim 1 or 2 allows the recording disk to move with respect to the disk chucking mechanism even when a poor recording disk is mounted. When the recording disk is rotated by the motor, high rotational characteristics can be realized, so that data on various recording disks can be read / written with high accuracy.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a disk chucking mechanism and a motor including the same according to the present invention will be described with reference to FIGS. 1 and 2, but the present invention is not limited to the embodiments described below. In the description of the present embodiment, the vertical direction of each drawing is referred to as “vertical direction” for convenience, but the direction in the actual mounting state is not limited.
[0014]
FIG. 1 is a sectional view of a motor provided with a disk chucking mechanism according to an embodiment of the present invention. FIG. 2 is a plan view of a turntable including the disk chucking mechanism according to the embodiment of the present invention. 1 and 2, a bearing holder 4 is provided on a base 2 attached to a disk drive (not shown) for reading / writing data on a recording disk D, and an oil-impregnated metal is provided on an inner peripheral surface of the bearing holder 4. A cylindrical radial bearing 6 is fitted and fixed. A thrust bearing 8 and a cover member 10 holding the thrust bearing 8 are attached to a lower end of the bearing holder 4, and a stator 12 is fixed to an outer periphery of the bearing holder 4.
[0015]
The rotary shaft 14 is rotatably supported by the radial bearing 6 and the thrust bearing 8 so as to have a rotation axis in the vertical direction (axial direction), and a substantially disk-shaped turntable 16 is fixed to the upper end of the rotation shaft 14. I have. In the vicinity of the outer peripheral portion of the upper surface of the turntable 16, an annular cushioning material 26 also serving as a non-slip of the recording disk D is attached, and the recording disk D is placed via this. The cushioning material 26 may be made of a material having a large surface frictional force such as rubber and having elasticity. A substantially cylindrical back iron 18 is attached near the outer peripheral portion of the lower surface of the turntable 16, and an annular magnet 20 is provided on the inner peripheral surface of the back iron 18 so as to face the stator 12. ing.
[0016]
A flange 4a is provided on the outer periphery of the upper end of the bearing holder 4, and the flange 4a is engaged with a stopper 22 provided on the inner surface of the lower surface of the turntable 16 adjacent to the flange 4a, so that a turn is made. The table 16 is configured not to fall out.
[0017]
The turntable 16 is formed integrally and concentrically with the turntable 16 and has a substantially cylindrical resin-made disk alignment portion 24 into which the recording disk D is fitted. And an alignment claw portion 38 having a resin alignment claw 34 provided to move in and out of the disk alignment portion 24.
[0018]
The disc centering portion 24 includes a disk-shaped upper wall 24a having a central hole, an outer peripheral wall 24b extending from an outer periphery of the upper wall 24a, a flange 24c extending radially outward from a lower end of the outer wall 24b, An inner peripheral wall 24d extending from the inner periphery of the wall 24a. The inner peripheral wall 24d of the disc centering portion 24 is fitted to the cylindrical portion 16a of the turntable 16, and the upper surface of the turntable 16 forms a hollow space inside the disc centering portion 24.
[0019]
Inside the disc centering portion 24, three passages 24e for accommodating the centering claws 34 are provided at three radially spaced positions around the axis. The upper part of the passage 24e of the upper wall 24a and the outer part of the passage 24e of the outer peripheral wall 24b in the radial direction are open. The centering claw 34 is composed of a claw portion 34a having a circular ridge in a top view at a portion where the recording disk D abuts, and a cylindrical portion 34b for receiving the outer end of the coil spring 32, and the protrusion provided on the cylindrical portion 34b. The coil spring 32 is fitted in the portion 34c. The passages 24e are not necessarily provided at equal intervals, but may be provided so as to be deviated in the circumferential direction in accordance with a required pulling force or the like with respect to the recording disk D.
[0020]
An annular ring member 36 having an inner diameter larger than the outer diameter of the inner peripheral wall 24d is disposed in the hollow space formed by the disk centering portion 24. The ring member 36 has, for example, rebound resilience. It is formed of an elastic member such as natural rubber, chlorobrene rubber, urethane rubber, etc., which has excellent wear resistance and impact strength, and has three convex portions 36a at radially outwardly located at equal intervals on its outer periphery. Have been. The inner end of the coil spring 32 is fitted into the projection 36a, and the three alignment claws 34 are connected to the ring member 36 via the coil spring 32, so that the alignment claw portion 38 is integrally formed.
[0021]
Since the outer diameter of the disk centering portion 24 is set to be smaller than the diameter of the center hole of the recording disk D by several μm, the recording disks D are not excessively slid on the disk centering portion 24, and The centering portion 24 can be fitted without being greatly shifted from the center and without eccentricity.
[0022]
When the center hole of the recording disk D is fitted into the disk alignment portion 24, the inner peripheral portion of the lower surface of the recording disk D comes into contact with the alignment claw 34. When the recording disk D is pressed downward in this state, the pressing force causes the centering claw 34 to move radially inward against the urging force of the coil spring 32, thereby allowing the recording disk D to move downward. It becomes.
[0023]
When the recording disk D is moved until it comes into contact with the buffer material 26 and is mounted on the turntable 16, the alignment claw 34 housed inside the disk alignment portion 24 is radially outwardly urged by the urging force of the coil spring 32. After moving, the recording disk D is fixed on the turntable 16. When the recording disk D is mounted on the disk alignment portion 24, the alignment claw 34 is slightly moved inward in the radial direction. The disk D is fixed to the turntable 16 by the centering claws 34.
[0024]
The elastic forces of the three coil springs 32 that urge the alignment claws 34 radially outward vary. The three alignment claws 34 are integrated by a ring member 36 via the coil spring 32, respectively, to form an alignment claw portion 38. When the recording disk D is mounted, the radially nonuniform force acting on the recording disk D due to the variation in elasticity of the coil springs 32 is absorbed by the deformation of the ring member 36 formed of the elastic member. . Accordingly, the force of holding the recording disk D by the three alignment claws 34 becomes equal, and the alignment can be performed easily with respect to the axis.
[0025]
Therefore, the force generated at the time of disc chucking is evenly dispersed by the integrated alignment claw portion 38 by connecting the three alignment claws 34 to one ring member 36 via the coil spring 32, and the alignment deviation is performed. Can prevent fluctuations in alignment accuracy that occur each time the recording disk is chucked, thereby preventing whirling, abnormal vibration / noise, and errors in reading / writing data from / to the recording disk. In addition, it is possible to prevent the disk drive device and the recording disk from being damaged due to scattering (separation) of the recording disk when the motor rotates at a high speed.
[0026]
Further, even if a bad recording disk is mounted, the motor provided with the disk chucking mechanism can keep such a recording disk in an accurate position with respect to the disk chucking mechanism. When the disk is rotated by the motor, high rotation characteristics can be realized, so that data of various recording disks can be read / written with high accuracy.
[0027]
When removing the recording disk D from the disk chucking mechanism, the recording disk D is raised in the axial direction. At this time, since the urging force acts radially inward from the recording disk D on the alignment claw 34 against the urging force of the coil spring 32, the alignment claw 34 moves on the passage 24e and And the recording disk D is moved upward in the axial direction, and the recording disk D can be removed.
[0028]
Although the embodiments according to the present invention have been described above, the scope of the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, if the inner diameter of the ring member 36 is larger than the outer diameter of the inner peripheral wall 24d of the disk alignment portion 24, the ring member 36 may not be an elastic member. When the ring member 36 is formed of an elastic member, the inner diameter of the ring member 36 may be equal to or slightly smaller than the outer diameter of the inner peripheral wall 24 d of the disk alignment portion 24.
[0029]
Further, since the coil spring 32 connected to the ring member 36 is for resiliently engaging the centering claw 34 with the peripheral portion of the center hole of the recording disk D, a spherical shape is used instead of the coil spring 32. An elastic member such as a rubber ball may be used.
[0030]
【The invention's effect】
According to the chucking mechanism of the first aspect, a plurality of alignment pawls are connected by a single ring member via a spring, so that a force generated at the time of disk chucking is uniformly dispersed, and the alignment deviation is performed. And prevents fluctuations in alignment accuracy that occur each time the recording disk is chucked, thereby preventing whirling, abnormal vibration and noise, data reading / writing errors, and high-speed rotation. It is possible to prevent the disk drive device and the recording disk from being damaged due to the scattering (separation) of the disk at the time.
[0031]
In the disk chucking mechanism according to claim 2, since the ring member is formed of an elastic member, uneven force generated at the time of disk chucking is evenly dispersed by plastically deforming the ring member, which is more effective. Alignment deviation can be prevented, and variations in alignment accuracy that occur each time the recording disk is chucked can be suppressed, resulting in increased whirling, abnormal vibration and noise, or data read / write errors. In addition, it is possible to prevent damage to the disk drive device and the recording disk due to scattering (separation) of the recording disk during high-speed rotation.
[0032]
In the motor according to the third aspect, the disc chucking mechanism according to the first or second aspect can prevent misalignment and can suppress variation in alignment accuracy that occurs each time a recording disk is chucked. In addition, it is possible to prevent whirling, an increase in abnormal vibration / noise, or the occurrence of data reading / writing errors, and to prevent damage to a disk drive device and a recording disk due to scattering (disengagement) of the recording disk during high-speed rotation of the motor.
[0033]
Furthermore, the motor according to claim 3 including the disk chucking mechanism according to claim 1 or 2 allows the recording disk to move with respect to the disk chucking mechanism even when a poor recording disk is mounted. Since such a recording disk is held at an accurate position, when such a recording disk is rotated by the motor, high rotation characteristics can be realized, so that data on various recording disks can be read / written with high accuracy.
[Brief description of the drawings]
FIG. 1 is a sectional view of a motor provided with a disk chucking mechanism according to an embodiment of the present invention.
FIG. 2 is a plan view of a turntable including the disk chucking mechanism according to the embodiment of the present invention.
[Explanation of symbols]
D Recording disk 16 Turntable 24 Disk alignment part 32 Coil spring 34 Alignment claw 36 Ring member 38 Alignment claw part

Claims (3)

A turntable on which a recording disk having a center hole is removably mounted; and a substantially cylindrical disk having a central hole of the recording disk which is integrally and concentrically arranged at the center of the turntable. A plurality of core portions, each of which protrudes radially outward from the outer peripheral surface of the disk alignment portion, and which is biased by an independent spring so as to resiliently engage with a peripheral portion of a central hole of the recording disk; In a disk chucking mechanism having a centering claw,
An end of the spring opposite to the alignment nail is connected by a ring member, and the recording disk is aligned and held on the turntable by the ring member, the spring, and the alignment nail. A disk chucking mechanism, wherein a centering claw portion is formed. 2. The disk chucking mechanism according to claim 1, wherein said ring member is formed of an elastic member. A motor having a disk chucking mechanism such that the disk chucking mechanism according to claim 1 or 2 rotates integrally.

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