Patent ID: 6330220
Filing Date: 2001-12-11
Classification: G11B

Abstract:
A vibration preventing mechanism for a disc apparatus having a turntable on which a recording medium in the form of a disc is placed and a motor for rotating the turntable with said motor comprising a rotatable rotor having a rotor case in a shape substantially of a cup with a substantially flat top surface, a stator and a rotational shaft connected to said turntable;a plurality of magnets connected to said rotor case facing said stator,said strator having a plurality of electromagnetic coils oppositely facing said plurality of magnets;said turntable being spaced from said rotor case to form a confined space relative to said substantially flat top surface of said rotor case; anda plurality of weights disposed within said confined space between the top surface of said rotor case and said turntable in an arrangement with said weights spaced annually apart from one another with each of said weights being angularly displaceable in any circumferential direction of said rotor so as to cause a rotational annular displacement of said weights within said confined space relative to one another and to said rotor of up to a full 360.degree. rotation of a rotor when a vibration is caused in the rotation of the turntable of high speed of rotation of said rotor.