Patent ID: 6109101
Filing Date: 2000-08-29
Classification: G11B

Abstract:
A spindle motor rotational unbalance correction mechanism for a magnetic disk apparatus, said rotational unbalance correction mechanism comprising:a clamping device for temporarily fixing a magnetic disk to a rotatable spindle motor;a stand;a mounting device for mounting said magnetic disk apparatus to said stand;a base plate onto which said stand is placed, with an intervening resilient material;an acceleration sensor for detecting vibration of said magnetic disk apparatus when it is rotatably driven by said spindle motor and for converting said detected vibration into an electrical signal;an electrically driven vibrator for applying a mechanical shock to said magnetic disk apparatus; anda control circuit for processing said electrical signal from said acceleration sensor and for supplying a charge of electrical energy to said vibrator until the electrical signal from the detected vibration falls to below a predetermined cut-off level.