Device for preventing vibration of a disc motor shaft in a disc playback device

Abstract

In a disc playback device of a type in which a turntable is connected to a disc motor shaft, a device for preventing vibration of the disc motor shaft comprises magnetic biasing means for generating a magnetic force biasing the disc motor shaft in an axial or radial direction of the shaft. The magnetic biasing means is constructed by securing one of magnetic substance and a magnet to the turntable and disposing the other below the turntable or securing one of two magnets to the turntable and disposing the other magnet below the turntable. For preventing vibration of the disc motor shaft in the radial direction, a yoke plate is fixed to the magnet in such a manner that a part of the yoke plate is positioned on the lateral side of the magnetic substance or the other magnet.

Dependencies are inferred from the claim text.