Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Reexamination Certificate
2000-11-30
2002-10-01
Korzuch, William (Department: 2653)
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
C369S263100
Reexamination Certificate
active
06459675
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to disk players and, more particularly, to a self-compensating balancer for a disk player that is capable of preventing internal vibrations caused by eccentric center of mass of a disk and a turntable combined therewith.
2. Description of the Related Art
In general, disk players, for recording information on recording media such as compact disks (CDs), CD-ROMs, digital versatile disks (DVDs) and for reproducing recorded information from the recording media, must protect the disks and optical pickups from external shock and internal vibration.
In general, as shown in
FIG. 1
, a disk player includes a vertically rotatable deck base
10
hinged to a housing, a deck plate
20
combined with the deck base
10
, a spindle motor
21
installed on the deck plate
20
for providing rotary power to a disk
1
, and a turntable
23
combined with a rotating shaft
22
of the spindle motor
21
, on which the disk
1
is loaded. Also included are a damper
40
and an optical pickup
25
, which are installed on the upper internal surface of the housing so as to face the turntable
23
. Here, the damper
40
clamps the disk
1
to the turntable
23
. The optical pickup
25
is combined with the deck plate
20
so that the optical pickup
25
can be transferred in the radial direction of the disk
1
, during recording and reproducing operations.
A damper
30
is installed between the deck base
10
and the deck plate
20
. The damper
30
absorbs external vibrations directly transmitted to the deck plate
20
, the spindle motor
21
, and the optical pick-up
25
, through the deck base
10
. The damper
30
is formed of a material such as soft rubber or polyurethane.
The disk player having the above structure can effectively protect the disk
1
and the optical pick-up
25
from an external shock. However, a method of easing the internal vibration caused by the eccentric mass of the disk
1
during the rotation of the spindle motor
21
has not been considered. The disk
1
has an eccentric center of mass caused by a discordance between the center of gyration of the disk
1
and the centroid of the disk
1
caused by errors in the manufacturing processes thereof. The rotating shaft
22
of the spindle motor
21
revolves due to the eccentric mass of the disk
1
, during the rotation of the disk
1
. The influence of the revolution of the rotating shaft
22
does not have a significant effect in a low-speed model such as 1× and 2×speed models. However, the eccentric rotation does make it difficult to record information on and reproduce information from the recording media in a high-speed model such as a 6× or 8×speed model.
SUMMARY OF THE INVENTION
In order to solve the above problems, it is an object of the present invention to provide a self-compensating balancer for a disk player and a turntable combined with the same, which are capable of preventing internal vibrations caused by an eccentric mass of a disk during high-speed rotation.
To achieve the above object, there is provided a self-compensating balancer for a disk player, comprising a supporting plate fixed to a shaft rotated by a spindle motor for supporting rotary power to a disk, pivot pins installed in the supporting plate, two or more pendulums arranged around the supporting plate, and connectors for connecting the pendulums to the pivot pins. The connectors are operative to be elastically transformed so that the centroid of the pendulums faces the centroid of the disk, centered around the rotating shaft of the spindle motor, due to a centrifugal force, during the rotation of the disk.
The connectors are preferably thin strings that can be bent by an external force.
One or more connectors are preferably formed of nylon resin that can be bent by the external force.
To achieve the above object, there is provided a turntable combined with a self-compensating balancer for a disk player, comprising a seating unit, having a protrusion to which the central hole of a disk is combined and rotated in combination with the rotating shaft of a motor. A supporting plate is fixed to the rotating shaft so as to be separated from the seating unit by a predetermined distance and a plurality of pendulums are interposed between the seating unit and the supporting plate, such that the pendulums do not interfere with each other. A plurality of pivot pins are installed between the seating unit and the supporting plate. Connectors are provided for connecting the pivot pins to the pendulums. The connectors are capable of being elastically transformed so that a centroid of the pendulums faces a centroid of the disk centering around the rotating shaft during the rotation of the disk and, thus, the internal vibration caused by the eccentric mass of the disk is prevented.
REFERENCES:
patent: 4441178 (1984-04-01), Kobayashi et al.
patent: 5111713 (1992-05-01), Cameron et al.
patent: 6005311 (1999-12-01), Matsushima
patent: 6005749 (1999-12-01), Ikuta et al.
patent: 6061325 (2000-05-01), Zaun
patent: 6155134 (2000-12-01), Ikuta et al.
patent: 6243351 (2001-06-01), Huang
patent: 6330220 (2001-12-01), Shiga et al.
patent: 6373154 (2002-04-01), Sohn et al.
patent: 2001-258203 (2001-09-01), None
Beacham Christopher R
Korzuch William
Samsung Electronics Co,. Ltd.
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