Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Reexamination Certificate
1999-06-18
2001-07-03
Tupper, Robert S. (Department: 2652)
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
Reexamination Certificate
active
06256289
ABSTRACT:
INDUSTRIAL FIELD OF THE INVENTION
The present invention relates to a driving motor for driving replaceable storage media, such as CD-ROMs and the like.
DESCRIPTION OF THE RELATED ART
A conventional driving motor for storage media, such as a driving motor for CD-ROMs, is shown, for example, in
FIG. 5. A
lower section of a substantially cylindrical supporting member
3
is fitted into an opening
2
formed in an immobilizing member
1
, such as a chassis. A bottom-face opening in the supporting member
3
is blocked by a blocking plate
4
. A thrust pad
5
is placed on the blocking plate
4
and is arranged on a bottom section of the supporting member
3
. A slide bearing
6
is fitted to the inside of the supporting member
3
.
A core
8
a
is fitted outside of the supporting member
3
, and a winding
8
b
is wound around the core
8
a
, constituting a stator
8
in cooperation with the core
8
a
. A shaft
9
is inserted into the slide bearing
6
, the lower end of the shaft abutting the thrust pad
5
, and an upper end portion of the shaft protruding upward of the supporting member
3
. A rotor hub
10
is made of a nonmagnetic material, such as aluminum, and is fitted onto an upper end portion of the shaft
9
. A rotor yoke
11
made of a magnetic material, such as a ferrous material, mounted to the rotor hub
10
.
The rotor yoke
11
is comprised of a disc-like base section and a pendent lateral section integrally formed downward at the periphery of the base section. The supporting member
3
is received through an opening formed in the central portion of the base section of the rotor yoke
11
, in which, the peripheral portion of the opening is fitted to a lower end portion. A driving magnet
12
is inserted to the inside of the pendent lateral section of the rotor yoke
11
and is arranged so as to oppose the stator
8
.
As shown in
FIG. 5
, a turntable
14
is fitted outside of the rotor hub
10
. A storage disk D is mounted on an upper face of the turntable
14
via a cushioned material
15
. A clamp magnet
16
is buried or set within an upper face of the rotor hub
10
so as to be substantially coplanar with the upper face of the rotor hub. A disk-pressing means on the side of a driving apparatus (not shown) is magnetically attracted by the clamp magnet
16
to immobilize the storage disk D, such as a CD-ROM.
In the above-described conventional driving motor, the direction of current flow to the winding
8
b
of the stator
8
is controlled so as to cause the stator
8
to generate rotational magnetic fields. By the interaction of the rotational magnetic fields and static magnetic fields of the driving magnet
12
, the driving magnet
12
, the rotor yoke
11
, the rotor hub
10
, and the shaft
9
are rotated relative to the static stator
8
. Accordingly, the turntable
14
and the storage disk D are rotated in a constant direction.
The aforementioned motor of conventional design has an independently formed rotor yoke
11
and a turntable
14
that rotate with the shaft
9
. This configuration gives rise to several problems. One problem is that the number of overall motor components is increased, thereby increasing costs because of increased in-assembly inspection items and the like. Another problem is that the overall height in the direction of rotation-axis line is increased, making size reduction impossible.
Also, with the recent development of high-speed motors, insignificant dimensional deviations in individual sections (for example, variation in shapes of CD-ROMs, character patterns of printing on the disk faces, and labels pasted thereon) which could previously be ignored can no longer be ignored when there is high-speed rotation. These deviations raise a further problem by causing a decrease in balance (increased imbalance) during rotation and run-out of the disk, undesirable vibration, and noise of the motor.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a small and thin disk driving motor which is driven with high stability at high speed.
Another object of the present invention is to provide a disk driving motor which can be manufactured at low production costs but yet which operates with high rotational performance.
A still further object of the present invention is to provide a disk driving motor that offers high rotational performance despite dimensional errors of the motor.
In one aspect of the present invention, a storage media driving motor is provided having a shaft, a turntable mounted on the shaft and jointly rotatable with a replaceable disk type data storage media, and a rotor yoke integrally formed with the turntable, the turntable and the rotor yoke defining a rotor. An inner-periphery-side concave section opens outwardly in an axial-line direction or the rotor and is formed in the vicinity of a portion where the rotor is fitted to the shaft, and a center ring for determining a position of the data storage disk is arranged in the inner-periphery-side concave section.
Because the rotor yoke and the turntable are integrally formed, the production cost of the motor may be reduced and the accuracy of assembly is improved. In addition, the center ring is arranged within the inner-periphery-side concave section, thereby facilitating an effective assembly process in arrangement of the center ring.
In addition, in another aspect of the present invention, a data storage media driving motor has a position-determiner disposed within the rotor so as to form a circular space which accommodates balancer objects for correcting mass imbalances in the rotor and/or the data storage disk. The balancer objects are accommodated within the circular space so as to be movable in the peripheral direction.
Therefore, if the disk and/or the rotor should have a mass imbalance, runout of the disk, undesirable vibration, or noise of the motor, the balancer objects act to correct the mass imbalance such that the motor rotates with high accuracy.
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patent: 5111713 (1992-05-01), Cameron et al.
patent: 5633856 (1997-05-01), Mukawa
patent: 6005311 (1999-12-01), Matsushima
patent: 6005749 (1999-12-01), Ikuta et al.
patent: 6061325 (2000-05-01), Zaun
patent: 6125098 (2000-09-01), Osawa
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patent: 6-060531 (1994-03-01), None
patent: 9-190675 (1997-07-01), None
patent: 10-083622 (1998-03-01), None
patent: 10-092094 (1998-04-01), None
patent: 10-124990 (1998-05-01), None
Burns Doane , Swecker, Mathis LLP
Nidec Corporation
Tupper Robert S.
Watko Julie Anne
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