Patent ID: 6115210
Filing Date: 2000-09-05
Classification: G11B

Abstract:
A disc apparatus for recording and reproducing signals to/from a disc, which includes a clamping plate, using light or magnetism, comprising:a rotatable turntable on which the disc is placed;a rotatable spindle firmly fixed to said turntable so that any movement of said spindle in any axial direction of said spindle causes said turntable to move;a magnetic material firmly fixed to said turntable, said magnetic material being permeable to magnetic flux and including an arc-shaped surface which contacts said clamping plate, a circumferential length of the arc-shaped surface being greater than a radial width of the arc-shaped surface; anda motor for driving said turntable, said motor including a magnet provided on said turntable and generating the magnetic flux and an excitation coil facing said magnet, said magnetic material guiding the magnetic flux toward said clamping plate so that said magnet applies magnetic attractive force to said clamping plate.