| 摘要 |
PROBLEM TO BE SOLVED: To provide a turntable which enables rapid automatic aligning of an unbalanced recording disk rotating at a high speed. SOLUTION: A hollow annular part 25 is concentrically resin molded into a turntable. An L type magnet where a cylindrical magnet 26 is unified in a body with an inner wall 25a of the annular part 25, and a plate type annular magnet 27 is unified into a body having an upper surface 21d is insert molded. An adequate number of magnetic spherical bodies 24 are movably installed in an annular space 25d, which are combined with a lower side annular part 25-2 and defined. When the turntable 21 is rotated at a high speed, the contact pressure of the spherical bodies 24 and an outer wall 25b which is caused by centrifugal force is reduced by a magnetic force of the cylindrical magnet 26, and the contact pressure against a bottom surface 25-2g due to gravity is reduced by the magnetic force of the plate type annular magnet 27. Contact friction of the magnetic spherical bodies 24 is reduced and mobility is improved, so that automatic aligning function can be obtained effectively. |
