Automatic balancing device of optic disc drive

摘要

An automatic balancing device of an optic disc drive includes 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.