Patent ID: 6324154
Filing Date: 2001-11-27
Classification: G11B

Abstract:
A disc apparatus for recording and reproducing signals using light or magnetism, comprising:a turntable supported rotatably and also supported slidably in an axial direction with respect to a base, said turntable having a first surface for holding a disc and a second surface on an opposite side, and in part magnetized with a magnetized surface formed on said opposite side;an excitation coil mounted on said base and disposed oppositely to said magnetized surface of said turntable;a drive circuit driving a focus actuator;a detector detecting focusing error of an optical pickup; anda control circuit controlling the energization of said excitation coil in accordance with the output of said detector and moving said turntable in said axial direction by means of the magnetic force between said excitation coil and said magnetized turntable.