Automatic balancing device of optic disc drive

Details Automatic balancing device of optic disc drive Automatic balancing device of optic disc drive

1999-06-21

2001-06-05

Letscher, George J. (Department: 2652)

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

Reexamination Certificate

active

06243351

ABSTRACT:

FIELD OF THE INVENTION
The present invention generally relates to an optic disc drive, such as CD-ROM and DVD, and in particular to an automatic balancing device of an optic disc drive for automatically balancing rotation of an optic disc during the operation of the optic disc drive.
BACKGROUND OF THE INVENTION
An optic disc drive, such as CD-ROM and DVD, is an important data storage device of a computer system. The operational speed of the optic disc drive has been significantly increased recently. The high operational speed makes vibration caused by operation of motor or unbalance weight of a disc more severe for such a vibration may result in undesired access error. Thus it is desired to have a balancing device for achieving balance of rotation of an optic disc and reducing the vibration caused thereby during the operation of the optic disc drive.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an automatic balancing device of an optic disc drive for achieving balance of rotation of an optic disc and reducing vibration induced thereby during operation of the optic disc drive.
Another object of the present invention is to provide an automatic balancing device for reducing vibration during operation of an optic disc drive, the automatic balancing device being modifiable to suit for different types of optic disc drive.
To achieve the above object, in accordance with the present invention, there is provided an automatic balancing device of an optic disc drive comprising a circular disk made of ferromagnetic material mounted to an output spindle of a motor of the optic disc drive and a circular tray supported on the circular disk. The circular tray has a central axle and defines an annular space around the axle and a plurality of circular channels concentrically surrounding the annular space. A ring magnet is retained in the annular space for attracting the circular disk thereby soundly retaining the circular tray on the circular disk. A plurality of weight balls are received in each of the circular channels and are allowed to freely roll in the corresponding channels. A cover is attached to the circular tray for retaining the balls in the channels and supporting and driving an optic disc. When the motor is actuated and the circular tray is rotated, the balls are free to roll in the corresponding channels thereby automatically achieving balance of rotation of the optic disc.


REFERENCES:
patent: 5845542 (1998-12-01), Hannah et al.
patent: 6005749 (1999-12-01), Ikuta et al.
patent: 6160780 (2000-12-01), Furukawa et al.

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